Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 1 | /***************************************************************************** |
| 2 | * * |
| 3 | * File: sge.c * |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 4 | * $Revision: 1.26 $ * |
| 5 | * $Date: 2005/06/21 18:29:48 $ * |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 6 | * Description: * |
| 7 | * DMA engine. * |
| 8 | * part of the Chelsio 10Gb Ethernet Driver. * |
| 9 | * * |
| 10 | * This program is free software; you can redistribute it and/or modify * |
| 11 | * it under the terms of the GNU General Public License, version 2, as * |
| 12 | * published by the Free Software Foundation. * |
| 13 | * * |
| 14 | * You should have received a copy of the GNU General Public License along * |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., * |
| 16 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * |
| 17 | * * |
| 18 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * |
| 19 | * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * |
| 20 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. * |
| 21 | * * |
| 22 | * http://www.chelsio.com * |
| 23 | * * |
| 24 | * Copyright (c) 2003 - 2005 Chelsio Communications, Inc. * |
| 25 | * All rights reserved. * |
| 26 | * * |
| 27 | * Maintainers: maintainers@chelsio.com * |
| 28 | * * |
| 29 | * Authors: Dimitrios Michailidis <dm@chelsio.com> * |
| 30 | * Tina Yang <tainay@chelsio.com> * |
| 31 | * Felix Marti <felix@chelsio.com> * |
| 32 | * Scott Bardone <sbardone@chelsio.com> * |
| 33 | * Kurt Ottaway <kottaway@chelsio.com> * |
| 34 | * Frank DiMambro <frank@chelsio.com> * |
| 35 | * * |
| 36 | * History: * |
| 37 | * * |
| 38 | ****************************************************************************/ |
| 39 | |
| 40 | #include "common.h" |
| 41 | |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 42 | #include <linux/types.h> |
| 43 | #include <linux/errno.h> |
| 44 | #include <linux/pci.h> |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 45 | #include <linux/ktime.h> |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 46 | #include <linux/netdevice.h> |
| 47 | #include <linux/etherdevice.h> |
| 48 | #include <linux/if_vlan.h> |
| 49 | #include <linux/skbuff.h> |
| 50 | #include <linux/init.h> |
| 51 | #include <linux/mm.h> |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 52 | #include <linux/tcp.h> |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 53 | #include <linux/ip.h> |
| 54 | #include <linux/in.h> |
| 55 | #include <linux/if_arp.h> |
| 56 | |
| 57 | #include "cpl5_cmd.h" |
| 58 | #include "sge.h" |
| 59 | #include "regs.h" |
| 60 | #include "espi.h" |
| 61 | |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 62 | /* This belongs in if_ether.h */ |
| 63 | #define ETH_P_CPL5 0xf |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 64 | |
| 65 | #define SGE_CMDQ_N 2 |
| 66 | #define SGE_FREELQ_N 2 |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 67 | #define SGE_CMDQ0_E_N 1024 |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 68 | #define SGE_CMDQ1_E_N 128 |
| 69 | #define SGE_FREEL_SIZE 4096 |
| 70 | #define SGE_JUMBO_FREEL_SIZE 512 |
| 71 | #define SGE_FREEL_REFILL_THRESH 16 |
| 72 | #define SGE_RESPQ_E_N 1024 |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 73 | #define SGE_INTRTIMER_NRES 1000 |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 74 | #define SGE_RX_SM_BUF_SIZE 1536 |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 75 | #define SGE_TX_DESC_MAX_PLEN 16384 |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 76 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 77 | #define SGE_RESPQ_REPLENISH_THRES (SGE_RESPQ_E_N / 4) |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 78 | |
| 79 | /* |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 80 | * Period of the TX buffer reclaim timer. This timer does not need to run |
| 81 | * frequently as TX buffers are usually reclaimed by new TX packets. |
| 82 | */ |
| 83 | #define TX_RECLAIM_PERIOD (HZ / 4) |
| 84 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 85 | #define M_CMD_LEN 0x7fffffff |
| 86 | #define V_CMD_LEN(v) (v) |
| 87 | #define G_CMD_LEN(v) ((v) & M_CMD_LEN) |
| 88 | #define V_CMD_GEN1(v) ((v) << 31) |
| 89 | #define V_CMD_GEN2(v) (v) |
| 90 | #define F_CMD_DATAVALID (1 << 1) |
| 91 | #define F_CMD_SOP (1 << 2) |
| 92 | #define V_CMD_EOP(v) ((v) << 3) |
| 93 | |
| 94 | /* |
| 95 | * Command queue, receive buffer list, and response queue descriptors. |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 96 | */ |
| 97 | #if defined(__BIG_ENDIAN_BITFIELD) |
| 98 | struct cmdQ_e { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 99 | u32 addr_lo; |
| 100 | u32 len_gen; |
| 101 | u32 flags; |
| 102 | u32 addr_hi; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 103 | }; |
| 104 | |
| 105 | struct freelQ_e { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 106 | u32 addr_lo; |
| 107 | u32 len_gen; |
| 108 | u32 gen2; |
| 109 | u32 addr_hi; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 110 | }; |
| 111 | |
| 112 | struct respQ_e { |
| 113 | u32 Qsleeping : 4; |
| 114 | u32 Cmdq1CreditReturn : 5; |
| 115 | u32 Cmdq1DmaComplete : 5; |
| 116 | u32 Cmdq0CreditReturn : 5; |
| 117 | u32 Cmdq0DmaComplete : 5; |
| 118 | u32 FreelistQid : 2; |
| 119 | u32 CreditValid : 1; |
| 120 | u32 DataValid : 1; |
| 121 | u32 Offload : 1; |
| 122 | u32 Eop : 1; |
| 123 | u32 Sop : 1; |
| 124 | u32 GenerationBit : 1; |
| 125 | u32 BufferLength; |
| 126 | }; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 127 | #elif defined(__LITTLE_ENDIAN_BITFIELD) |
| 128 | struct cmdQ_e { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 129 | u32 len_gen; |
| 130 | u32 addr_lo; |
| 131 | u32 addr_hi; |
| 132 | u32 flags; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 133 | }; |
| 134 | |
| 135 | struct freelQ_e { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 136 | u32 len_gen; |
| 137 | u32 addr_lo; |
| 138 | u32 addr_hi; |
| 139 | u32 gen2; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 140 | }; |
| 141 | |
| 142 | struct respQ_e { |
| 143 | u32 BufferLength; |
| 144 | u32 GenerationBit : 1; |
| 145 | u32 Sop : 1; |
| 146 | u32 Eop : 1; |
| 147 | u32 Offload : 1; |
| 148 | u32 DataValid : 1; |
| 149 | u32 CreditValid : 1; |
| 150 | u32 FreelistQid : 2; |
| 151 | u32 Cmdq0DmaComplete : 5; |
| 152 | u32 Cmdq0CreditReturn : 5; |
| 153 | u32 Cmdq1DmaComplete : 5; |
| 154 | u32 Cmdq1CreditReturn : 5; |
| 155 | u32 Qsleeping : 4; |
| 156 | } ; |
| 157 | #endif |
| 158 | |
| 159 | /* |
| 160 | * SW Context Command and Freelist Queue Descriptors |
| 161 | */ |
| 162 | struct cmdQ_ce { |
| 163 | struct sk_buff *skb; |
| 164 | DECLARE_PCI_UNMAP_ADDR(dma_addr); |
| 165 | DECLARE_PCI_UNMAP_LEN(dma_len); |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 166 | }; |
| 167 | |
| 168 | struct freelQ_ce { |
| 169 | struct sk_buff *skb; |
| 170 | DECLARE_PCI_UNMAP_ADDR(dma_addr); |
| 171 | DECLARE_PCI_UNMAP_LEN(dma_len); |
| 172 | }; |
| 173 | |
| 174 | /* |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 175 | * SW command, freelist and response rings |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 176 | */ |
| 177 | struct cmdQ { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 178 | unsigned long status; /* HW DMA fetch status */ |
| 179 | unsigned int in_use; /* # of in-use command descriptors */ |
| 180 | unsigned int size; /* # of descriptors */ |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 181 | unsigned int processed; /* total # of descs HW has processed */ |
| 182 | unsigned int cleaned; /* total # of descs SW has reclaimed */ |
| 183 | unsigned int stop_thres; /* SW TX queue suspend threshold */ |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 184 | u16 pidx; /* producer index (SW) */ |
| 185 | u16 cidx; /* consumer index (HW) */ |
| 186 | u8 genbit; /* current generation (=valid) bit */ |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 187 | u8 sop; /* is next entry start of packet? */ |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 188 | struct cmdQ_e *entries; /* HW command descriptor Q */ |
| 189 | struct cmdQ_ce *centries; /* SW command context descriptor Q */ |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 190 | dma_addr_t dma_addr; /* DMA addr HW command descriptor Q */ |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 191 | spinlock_t lock; /* Lock to protect cmdQ enqueuing */ |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 192 | }; |
| 193 | |
| 194 | struct freelQ { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 195 | unsigned int credits; /* # of available RX buffers */ |
| 196 | unsigned int size; /* free list capacity */ |
| 197 | u16 pidx; /* producer index (SW) */ |
| 198 | u16 cidx; /* consumer index (HW) */ |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 199 | u16 rx_buffer_size; /* Buffer size on this free list */ |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 200 | u16 dma_offset; /* DMA offset to align IP headers */ |
| 201 | u16 recycleq_idx; /* skb recycle q to use */ |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 202 | u8 genbit; /* current generation (=valid) bit */ |
| 203 | struct freelQ_e *entries; /* HW freelist descriptor Q */ |
| 204 | struct freelQ_ce *centries; /* SW freelist context descriptor Q */ |
| 205 | dma_addr_t dma_addr; /* DMA addr HW freelist descriptor Q */ |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 206 | }; |
| 207 | |
| 208 | struct respQ { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 209 | unsigned int credits; /* credits to be returned to SGE */ |
| 210 | unsigned int size; /* # of response Q descriptors */ |
| 211 | u16 cidx; /* consumer index (SW) */ |
| 212 | u8 genbit; /* current generation(=valid) bit */ |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 213 | struct respQ_e *entries; /* HW response descriptor Q */ |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 214 | dma_addr_t dma_addr; /* DMA addr HW response descriptor Q */ |
| 215 | }; |
| 216 | |
| 217 | /* Bit flags for cmdQ.status */ |
| 218 | enum { |
| 219 | CMDQ_STAT_RUNNING = 1, /* fetch engine is running */ |
| 220 | CMDQ_STAT_LAST_PKT_DB = 2 /* last packet rung the doorbell */ |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 221 | }; |
| 222 | |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 223 | /* T204 TX SW scheduler */ |
| 224 | |
| 225 | /* Per T204 TX port */ |
| 226 | struct sched_port { |
| 227 | unsigned int avail; /* available bits - quota */ |
| 228 | unsigned int drain_bits_per_1024ns; /* drain rate */ |
| 229 | unsigned int speed; /* drain rate, mbps */ |
| 230 | unsigned int mtu; /* mtu size */ |
| 231 | struct sk_buff_head skbq; /* pending skbs */ |
| 232 | }; |
| 233 | |
| 234 | /* Per T204 device */ |
| 235 | struct sched { |
| 236 | ktime_t last_updated; /* last time quotas were computed */ |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 237 | unsigned int max_avail; /* max bits to be sent to any port */ |
| 238 | unsigned int port; /* port index (round robin ports) */ |
| 239 | unsigned int num; /* num skbs in per port queues */ |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 240 | struct sched_port p[MAX_NPORTS]; |
| 241 | struct tasklet_struct sched_tsk;/* tasklet used to run scheduler */ |
| 242 | }; |
| 243 | static void restart_sched(unsigned long); |
| 244 | |
| 245 | |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 246 | /* |
| 247 | * Main SGE data structure |
| 248 | * |
| 249 | * Interrupts are handled by a single CPU and it is likely that on a MP system |
| 250 | * the application is migrated to another CPU. In that scenario, we try to |
| 251 | * seperate the RX(in irq context) and TX state in order to decrease memory |
| 252 | * contention. |
| 253 | */ |
| 254 | struct sge { |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 255 | struct adapter *adapter; /* adapter backpointer */ |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 256 | struct net_device *netdev; /* netdevice backpointer */ |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 257 | struct freelQ freelQ[SGE_FREELQ_N]; /* buffer free lists */ |
| 258 | struct respQ respQ; /* response Q */ |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 259 | unsigned long stopped_tx_queues; /* bitmap of suspended Tx queues */ |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 260 | unsigned int rx_pkt_pad; /* RX padding for L2 packets */ |
| 261 | unsigned int jumbo_fl; /* jumbo freelist Q index */ |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 262 | unsigned int intrtimer_nres; /* no-resource interrupt timer */ |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 263 | unsigned int fixed_intrtimer;/* non-adaptive interrupt timer */ |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 264 | struct timer_list tx_reclaim_timer; /* reclaims TX buffers */ |
| 265 | struct timer_list espibug_timer; |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 266 | unsigned long espibug_timeout; |
| 267 | struct sk_buff *espibug_skb[MAX_NPORTS]; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 268 | u32 sge_control; /* shadow value of sge control reg */ |
| 269 | struct sge_intr_counts stats; |
Stephen Hemminger | 56f643c | 2006-12-01 16:36:21 -0800 | [diff] [blame] | 270 | struct sge_port_stats *port_stats[MAX_NPORTS]; |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 271 | struct sched *tx_sched; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 272 | struct cmdQ cmdQ[SGE_CMDQ_N] ____cacheline_aligned_in_smp; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 273 | }; |
| 274 | |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 275 | /* |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 276 | * stop tasklet and free all pending skb's |
| 277 | */ |
| 278 | static void tx_sched_stop(struct sge *sge) |
| 279 | { |
| 280 | struct sched *s = sge->tx_sched; |
| 281 | int i; |
| 282 | |
| 283 | tasklet_kill(&s->sched_tsk); |
| 284 | |
| 285 | for (i = 0; i < MAX_NPORTS; i++) |
| 286 | __skb_queue_purge(&s->p[s->port].skbq); |
| 287 | } |
| 288 | |
| 289 | /* |
| 290 | * t1_sched_update_parms() is called when the MTU or link speed changes. It |
| 291 | * re-computes scheduler parameters to scope with the change. |
| 292 | */ |
| 293 | unsigned int t1_sched_update_parms(struct sge *sge, unsigned int port, |
| 294 | unsigned int mtu, unsigned int speed) |
| 295 | { |
| 296 | struct sched *s = sge->tx_sched; |
| 297 | struct sched_port *p = &s->p[port]; |
| 298 | unsigned int max_avail_segs; |
| 299 | |
| 300 | pr_debug("t1_sched_update_params mtu=%d speed=%d\n", mtu, speed); |
| 301 | if (speed) |
| 302 | p->speed = speed; |
| 303 | if (mtu) |
| 304 | p->mtu = mtu; |
| 305 | |
| 306 | if (speed || mtu) { |
| 307 | unsigned long long drain = 1024ULL * p->speed * (p->mtu - 40); |
| 308 | do_div(drain, (p->mtu + 50) * 1000); |
| 309 | p->drain_bits_per_1024ns = (unsigned int) drain; |
| 310 | |
| 311 | if (p->speed < 1000) |
| 312 | p->drain_bits_per_1024ns = |
| 313 | 90 * p->drain_bits_per_1024ns / 100; |
| 314 | } |
| 315 | |
| 316 | if (board_info(sge->adapter)->board == CHBT_BOARD_CHT204) { |
| 317 | p->drain_bits_per_1024ns -= 16; |
| 318 | s->max_avail = max(4096U, p->mtu + 16 + 14 + 4); |
| 319 | max_avail_segs = max(1U, 4096 / (p->mtu - 40)); |
| 320 | } else { |
| 321 | s->max_avail = 16384; |
| 322 | max_avail_segs = max(1U, 9000 / (p->mtu - 40)); |
| 323 | } |
| 324 | |
| 325 | pr_debug("t1_sched_update_parms: mtu %u speed %u max_avail %u " |
| 326 | "max_avail_segs %u drain_bits_per_1024ns %u\n", p->mtu, |
| 327 | p->speed, s->max_avail, max_avail_segs, |
| 328 | p->drain_bits_per_1024ns); |
| 329 | |
| 330 | return max_avail_segs * (p->mtu - 40); |
| 331 | } |
| 332 | |
| 333 | /* |
| 334 | * t1_sched_max_avail_bytes() tells the scheduler the maximum amount of |
| 335 | * data that can be pushed per port. |
| 336 | */ |
| 337 | void t1_sched_set_max_avail_bytes(struct sge *sge, unsigned int val) |
| 338 | { |
| 339 | struct sched *s = sge->tx_sched; |
| 340 | unsigned int i; |
| 341 | |
| 342 | s->max_avail = val; |
| 343 | for (i = 0; i < MAX_NPORTS; i++) |
| 344 | t1_sched_update_parms(sge, i, 0, 0); |
| 345 | } |
| 346 | |
| 347 | /* |
| 348 | * t1_sched_set_drain_bits_per_us() tells the scheduler at which rate a port |
| 349 | * is draining. |
| 350 | */ |
| 351 | void t1_sched_set_drain_bits_per_us(struct sge *sge, unsigned int port, |
| 352 | unsigned int val) |
| 353 | { |
| 354 | struct sched *s = sge->tx_sched; |
| 355 | struct sched_port *p = &s->p[port]; |
| 356 | p->drain_bits_per_1024ns = val * 1024 / 1000; |
| 357 | t1_sched_update_parms(sge, port, 0, 0); |
| 358 | } |
| 359 | |
| 360 | |
| 361 | /* |
| 362 | * get_clock() implements a ns clock (see ktime_get) |
| 363 | */ |
| 364 | static inline ktime_t get_clock(void) |
| 365 | { |
| 366 | struct timespec ts; |
| 367 | |
| 368 | ktime_get_ts(&ts); |
| 369 | return timespec_to_ktime(ts); |
| 370 | } |
| 371 | |
| 372 | /* |
| 373 | * tx_sched_init() allocates resources and does basic initialization. |
| 374 | */ |
| 375 | static int tx_sched_init(struct sge *sge) |
| 376 | { |
| 377 | struct sched *s; |
| 378 | int i; |
| 379 | |
| 380 | s = kzalloc(sizeof (struct sched), GFP_KERNEL); |
| 381 | if (!s) |
| 382 | return -ENOMEM; |
| 383 | |
| 384 | pr_debug("tx_sched_init\n"); |
| 385 | tasklet_init(&s->sched_tsk, restart_sched, (unsigned long) sge); |
| 386 | sge->tx_sched = s; |
| 387 | |
| 388 | for (i = 0; i < MAX_NPORTS; i++) { |
| 389 | skb_queue_head_init(&s->p[i].skbq); |
| 390 | t1_sched_update_parms(sge, i, 1500, 1000); |
| 391 | } |
| 392 | |
| 393 | return 0; |
| 394 | } |
| 395 | |
| 396 | /* |
| 397 | * sched_update_avail() computes the delta since the last time it was called |
| 398 | * and updates the per port quota (number of bits that can be sent to the any |
| 399 | * port). |
| 400 | */ |
| 401 | static inline int sched_update_avail(struct sge *sge) |
| 402 | { |
| 403 | struct sched *s = sge->tx_sched; |
| 404 | ktime_t now = get_clock(); |
| 405 | unsigned int i; |
| 406 | long long delta_time_ns; |
| 407 | |
| 408 | delta_time_ns = ktime_to_ns(ktime_sub(now, s->last_updated)); |
| 409 | |
| 410 | pr_debug("sched_update_avail delta=%lld\n", delta_time_ns); |
| 411 | if (delta_time_ns < 15000) |
| 412 | return 0; |
| 413 | |
| 414 | for (i = 0; i < MAX_NPORTS; i++) { |
| 415 | struct sched_port *p = &s->p[i]; |
| 416 | unsigned int delta_avail; |
| 417 | |
| 418 | delta_avail = (p->drain_bits_per_1024ns * delta_time_ns) >> 13; |
| 419 | p->avail = min(p->avail + delta_avail, s->max_avail); |
| 420 | } |
| 421 | |
| 422 | s->last_updated = now; |
| 423 | |
| 424 | return 1; |
| 425 | } |
| 426 | |
| 427 | /* |
| 428 | * sched_skb() is called from two different places. In the tx path, any |
| 429 | * packet generating load on an output port will call sched_skb() |
| 430 | * (skb != NULL). In addition, sched_skb() is called from the irq/soft irq |
| 431 | * context (skb == NULL). |
| 432 | * The scheduler only returns a skb (which will then be sent) if the |
| 433 | * length of the skb is <= the current quota of the output port. |
| 434 | */ |
| 435 | static struct sk_buff *sched_skb(struct sge *sge, struct sk_buff *skb, |
| 436 | unsigned int credits) |
| 437 | { |
| 438 | struct sched *s = sge->tx_sched; |
| 439 | struct sk_buff_head *skbq; |
| 440 | unsigned int i, len, update = 1; |
| 441 | |
| 442 | pr_debug("sched_skb %p\n", skb); |
| 443 | if (!skb) { |
| 444 | if (!s->num) |
| 445 | return NULL; |
| 446 | } else { |
| 447 | skbq = &s->p[skb->dev->if_port].skbq; |
| 448 | __skb_queue_tail(skbq, skb); |
| 449 | s->num++; |
| 450 | skb = NULL; |
| 451 | } |
| 452 | |
| 453 | if (credits < MAX_SKB_FRAGS + 1) |
| 454 | goto out; |
| 455 | |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 456 | again: |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 457 | for (i = 0; i < MAX_NPORTS; i++) { |
| 458 | s->port = ++s->port & (MAX_NPORTS - 1); |
| 459 | skbq = &s->p[s->port].skbq; |
| 460 | |
| 461 | skb = skb_peek(skbq); |
| 462 | |
| 463 | if (!skb) |
| 464 | continue; |
| 465 | |
| 466 | len = skb->len; |
| 467 | if (len <= s->p[s->port].avail) { |
| 468 | s->p[s->port].avail -= len; |
| 469 | s->num--; |
| 470 | __skb_unlink(skb, skbq); |
| 471 | goto out; |
| 472 | } |
| 473 | skb = NULL; |
| 474 | } |
| 475 | |
| 476 | if (update-- && sched_update_avail(sge)) |
| 477 | goto again; |
| 478 | |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 479 | out: |
| 480 | /* If there are more pending skbs, we use the hardware to schedule us |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 481 | * again. |
| 482 | */ |
| 483 | if (s->num && !skb) { |
| 484 | struct cmdQ *q = &sge->cmdQ[0]; |
| 485 | clear_bit(CMDQ_STAT_LAST_PKT_DB, &q->status); |
| 486 | if (test_and_set_bit(CMDQ_STAT_RUNNING, &q->status) == 0) { |
| 487 | set_bit(CMDQ_STAT_LAST_PKT_DB, &q->status); |
| 488 | writel(F_CMDQ0_ENABLE, sge->adapter->regs + A_SG_DOORBELL); |
| 489 | } |
| 490 | } |
| 491 | pr_debug("sched_skb ret %p\n", skb); |
| 492 | |
| 493 | return skb; |
| 494 | } |
| 495 | |
| 496 | /* |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 497 | * PIO to indicate that memory mapped Q contains valid descriptor(s). |
| 498 | */ |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 499 | static inline void doorbell_pio(struct adapter *adapter, u32 val) |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 500 | { |
| 501 | wmb(); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 502 | writel(val, adapter->regs + A_SG_DOORBELL); |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 503 | } |
| 504 | |
| 505 | /* |
| 506 | * Frees all RX buffers on the freelist Q. The caller must make sure that |
| 507 | * the SGE is turned off before calling this function. |
| 508 | */ |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 509 | static void free_freelQ_buffers(struct pci_dev *pdev, struct freelQ *q) |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 510 | { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 511 | unsigned int cidx = q->cidx; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 512 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 513 | while (q->credits--) { |
| 514 | struct freelQ_ce *ce = &q->centries[cidx]; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 515 | |
| 516 | pci_unmap_single(pdev, pci_unmap_addr(ce, dma_addr), |
| 517 | pci_unmap_len(ce, dma_len), |
| 518 | PCI_DMA_FROMDEVICE); |
| 519 | dev_kfree_skb(ce->skb); |
| 520 | ce->skb = NULL; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 521 | if (++cidx == q->size) |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 522 | cidx = 0; |
| 523 | } |
| 524 | } |
| 525 | |
| 526 | /* |
| 527 | * Free RX free list and response queue resources. |
| 528 | */ |
| 529 | static void free_rx_resources(struct sge *sge) |
| 530 | { |
| 531 | struct pci_dev *pdev = sge->adapter->pdev; |
| 532 | unsigned int size, i; |
| 533 | |
| 534 | if (sge->respQ.entries) { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 535 | size = sizeof(struct respQ_e) * sge->respQ.size; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 536 | pci_free_consistent(pdev, size, sge->respQ.entries, |
| 537 | sge->respQ.dma_addr); |
| 538 | } |
| 539 | |
| 540 | for (i = 0; i < SGE_FREELQ_N; i++) { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 541 | struct freelQ *q = &sge->freelQ[i]; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 542 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 543 | if (q->centries) { |
| 544 | free_freelQ_buffers(pdev, q); |
| 545 | kfree(q->centries); |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 546 | } |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 547 | if (q->entries) { |
| 548 | size = sizeof(struct freelQ_e) * q->size; |
| 549 | pci_free_consistent(pdev, size, q->entries, |
| 550 | q->dma_addr); |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 551 | } |
| 552 | } |
| 553 | } |
| 554 | |
| 555 | /* |
| 556 | * Allocates basic RX resources, consisting of memory mapped freelist Qs and a |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 557 | * response queue. |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 558 | */ |
| 559 | static int alloc_rx_resources(struct sge *sge, struct sge_params *p) |
| 560 | { |
| 561 | struct pci_dev *pdev = sge->adapter->pdev; |
| 562 | unsigned int size, i; |
| 563 | |
| 564 | for (i = 0; i < SGE_FREELQ_N; i++) { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 565 | struct freelQ *q = &sge->freelQ[i]; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 566 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 567 | q->genbit = 1; |
| 568 | q->size = p->freelQ_size[i]; |
| 569 | q->dma_offset = sge->rx_pkt_pad ? 0 : NET_IP_ALIGN; |
| 570 | size = sizeof(struct freelQ_e) * q->size; |
Francois Romieu | 3e0f75b | 2006-12-05 23:57:41 +0100 | [diff] [blame] | 571 | q->entries = pci_alloc_consistent(pdev, size, &q->dma_addr); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 572 | if (!q->entries) |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 573 | goto err_no_mem; |
Francois Romieu | 3e0f75b | 2006-12-05 23:57:41 +0100 | [diff] [blame] | 574 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 575 | size = sizeof(struct freelQ_ce) * q->size; |
Stephen Hemminger | cbee9f9 | 2006-11-17 17:01:52 -0800 | [diff] [blame] | 576 | q->centries = kzalloc(size, GFP_KERNEL); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 577 | if (!q->centries) |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 578 | goto err_no_mem; |
| 579 | } |
| 580 | |
| 581 | /* |
| 582 | * Calculate the buffer sizes for the two free lists. FL0 accommodates |
| 583 | * regular sized Ethernet frames, FL1 is sized not to exceed 16K, |
| 584 | * including all the sk_buff overhead. |
| 585 | * |
| 586 | * Note: For T2 FL0 and FL1 are reversed. |
| 587 | */ |
| 588 | sge->freelQ[!sge->jumbo_fl].rx_buffer_size = SGE_RX_SM_BUF_SIZE + |
| 589 | sizeof(struct cpl_rx_data) + |
| 590 | sge->freelQ[!sge->jumbo_fl].dma_offset; |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 591 | |
| 592 | size = (16 * 1024) - |
| 593 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
| 594 | |
| 595 | sge->freelQ[sge->jumbo_fl].rx_buffer_size = size; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 596 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 597 | /* |
| 598 | * Setup which skb recycle Q should be used when recycling buffers from |
| 599 | * each free list. |
| 600 | */ |
| 601 | sge->freelQ[!sge->jumbo_fl].recycleq_idx = 0; |
| 602 | sge->freelQ[sge->jumbo_fl].recycleq_idx = 1; |
| 603 | |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 604 | sge->respQ.genbit = 1; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 605 | sge->respQ.size = SGE_RESPQ_E_N; |
| 606 | sge->respQ.credits = 0; |
| 607 | size = sizeof(struct respQ_e) * sge->respQ.size; |
Francois Romieu | 3e0f75b | 2006-12-05 23:57:41 +0100 | [diff] [blame] | 608 | sge->respQ.entries = |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 609 | pci_alloc_consistent(pdev, size, &sge->respQ.dma_addr); |
| 610 | if (!sge->respQ.entries) |
| 611 | goto err_no_mem; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 612 | return 0; |
| 613 | |
| 614 | err_no_mem: |
| 615 | free_rx_resources(sge); |
| 616 | return -ENOMEM; |
| 617 | } |
| 618 | |
| 619 | /* |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 620 | * Reclaims n TX descriptors and frees the buffers associated with them. |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 621 | */ |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 622 | static void free_cmdQ_buffers(struct sge *sge, struct cmdQ *q, unsigned int n) |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 623 | { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 624 | struct cmdQ_ce *ce; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 625 | struct pci_dev *pdev = sge->adapter->pdev; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 626 | unsigned int cidx = q->cidx; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 627 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 628 | q->in_use -= n; |
| 629 | ce = &q->centries[cidx]; |
| 630 | while (n--) { |
Francois Romieu | 3e0f75b | 2006-12-05 23:57:41 +0100 | [diff] [blame] | 631 | if (likely(pci_unmap_len(ce, dma_len))) { |
| 632 | pci_unmap_single(pdev, pci_unmap_addr(ce, dma_addr), |
| 633 | pci_unmap_len(ce, dma_len), |
| 634 | PCI_DMA_TODEVICE); |
| 635 | if (q->sop) |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 636 | q->sop = 0; |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 637 | } |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 638 | if (ce->skb) { |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 639 | dev_kfree_skb_any(ce->skb); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 640 | q->sop = 1; |
| 641 | } |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 642 | ce++; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 643 | if (++cidx == q->size) { |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 644 | cidx = 0; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 645 | ce = q->centries; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 646 | } |
| 647 | } |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 648 | q->cidx = cidx; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 649 | } |
| 650 | |
| 651 | /* |
| 652 | * Free TX resources. |
| 653 | * |
| 654 | * Assumes that SGE is stopped and all interrupts are disabled. |
| 655 | */ |
| 656 | static void free_tx_resources(struct sge *sge) |
| 657 | { |
| 658 | struct pci_dev *pdev = sge->adapter->pdev; |
| 659 | unsigned int size, i; |
| 660 | |
| 661 | for (i = 0; i < SGE_CMDQ_N; i++) { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 662 | struct cmdQ *q = &sge->cmdQ[i]; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 663 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 664 | if (q->centries) { |
| 665 | if (q->in_use) |
| 666 | free_cmdQ_buffers(sge, q, q->in_use); |
| 667 | kfree(q->centries); |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 668 | } |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 669 | if (q->entries) { |
| 670 | size = sizeof(struct cmdQ_e) * q->size; |
| 671 | pci_free_consistent(pdev, size, q->entries, |
| 672 | q->dma_addr); |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 673 | } |
| 674 | } |
| 675 | } |
| 676 | |
| 677 | /* |
| 678 | * Allocates basic TX resources, consisting of memory mapped command Qs. |
| 679 | */ |
| 680 | static int alloc_tx_resources(struct sge *sge, struct sge_params *p) |
| 681 | { |
| 682 | struct pci_dev *pdev = sge->adapter->pdev; |
| 683 | unsigned int size, i; |
| 684 | |
| 685 | for (i = 0; i < SGE_CMDQ_N; i++) { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 686 | struct cmdQ *q = &sge->cmdQ[i]; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 687 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 688 | q->genbit = 1; |
| 689 | q->sop = 1; |
| 690 | q->size = p->cmdQ_size[i]; |
| 691 | q->in_use = 0; |
| 692 | q->status = 0; |
| 693 | q->processed = q->cleaned = 0; |
| 694 | q->stop_thres = 0; |
| 695 | spin_lock_init(&q->lock); |
| 696 | size = sizeof(struct cmdQ_e) * q->size; |
Francois Romieu | 3e0f75b | 2006-12-05 23:57:41 +0100 | [diff] [blame] | 697 | q->entries = pci_alloc_consistent(pdev, size, &q->dma_addr); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 698 | if (!q->entries) |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 699 | goto err_no_mem; |
Francois Romieu | 3e0f75b | 2006-12-05 23:57:41 +0100 | [diff] [blame] | 700 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 701 | size = sizeof(struct cmdQ_ce) * q->size; |
Stephen Hemminger | cbee9f9 | 2006-11-17 17:01:52 -0800 | [diff] [blame] | 702 | q->centries = kzalloc(size, GFP_KERNEL); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 703 | if (!q->centries) |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 704 | goto err_no_mem; |
| 705 | } |
| 706 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 707 | /* |
| 708 | * CommandQ 0 handles Ethernet and TOE packets, while queue 1 is TOE |
| 709 | * only. For queue 0 set the stop threshold so we can handle one more |
| 710 | * packet from each port, plus reserve an additional 24 entries for |
| 711 | * Ethernet packets only. Queue 1 never suspends nor do we reserve |
| 712 | * space for Ethernet packets. |
| 713 | */ |
| 714 | sge->cmdQ[0].stop_thres = sge->adapter->params.nports * |
| 715 | (MAX_SKB_FRAGS + 1); |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 716 | return 0; |
| 717 | |
| 718 | err_no_mem: |
| 719 | free_tx_resources(sge); |
| 720 | return -ENOMEM; |
| 721 | } |
| 722 | |
| 723 | static inline void setup_ring_params(struct adapter *adapter, u64 addr, |
| 724 | u32 size, int base_reg_lo, |
| 725 | int base_reg_hi, int size_reg) |
| 726 | { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 727 | writel((u32)addr, adapter->regs + base_reg_lo); |
| 728 | writel(addr >> 32, adapter->regs + base_reg_hi); |
| 729 | writel(size, adapter->regs + size_reg); |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 730 | } |
| 731 | |
| 732 | /* |
| 733 | * Enable/disable VLAN acceleration. |
| 734 | */ |
| 735 | void t1_set_vlan_accel(struct adapter *adapter, int on_off) |
| 736 | { |
| 737 | struct sge *sge = adapter->sge; |
| 738 | |
| 739 | sge->sge_control &= ~F_VLAN_XTRACT; |
| 740 | if (on_off) |
| 741 | sge->sge_control |= F_VLAN_XTRACT; |
| 742 | if (adapter->open_device_map) { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 743 | writel(sge->sge_control, adapter->regs + A_SG_CONTROL); |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 744 | readl(adapter->regs + A_SG_CONTROL); /* flush */ |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 745 | } |
| 746 | } |
| 747 | |
| 748 | /* |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 749 | * Programs the various SGE registers. However, the engine is not yet enabled, |
| 750 | * but sge->sge_control is setup and ready to go. |
| 751 | */ |
| 752 | static void configure_sge(struct sge *sge, struct sge_params *p) |
| 753 | { |
| 754 | struct adapter *ap = sge->adapter; |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 755 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 756 | writel(0, ap->regs + A_SG_CONTROL); |
| 757 | setup_ring_params(ap, sge->cmdQ[0].dma_addr, sge->cmdQ[0].size, |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 758 | A_SG_CMD0BASELWR, A_SG_CMD0BASEUPR, A_SG_CMD0SIZE); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 759 | setup_ring_params(ap, sge->cmdQ[1].dma_addr, sge->cmdQ[1].size, |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 760 | A_SG_CMD1BASELWR, A_SG_CMD1BASEUPR, A_SG_CMD1SIZE); |
| 761 | setup_ring_params(ap, sge->freelQ[0].dma_addr, |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 762 | sge->freelQ[0].size, A_SG_FL0BASELWR, |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 763 | A_SG_FL0BASEUPR, A_SG_FL0SIZE); |
| 764 | setup_ring_params(ap, sge->freelQ[1].dma_addr, |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 765 | sge->freelQ[1].size, A_SG_FL1BASELWR, |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 766 | A_SG_FL1BASEUPR, A_SG_FL1SIZE); |
| 767 | |
| 768 | /* The threshold comparison uses <. */ |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 769 | writel(SGE_RX_SM_BUF_SIZE + 1, ap->regs + A_SG_FLTHRESHOLD); |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 770 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 771 | setup_ring_params(ap, sge->respQ.dma_addr, sge->respQ.size, |
| 772 | A_SG_RSPBASELWR, A_SG_RSPBASEUPR, A_SG_RSPSIZE); |
| 773 | writel((u32)sge->respQ.size - 1, ap->regs + A_SG_RSPQUEUECREDIT); |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 774 | |
| 775 | sge->sge_control = F_CMDQ0_ENABLE | F_CMDQ1_ENABLE | F_FL0_ENABLE | |
| 776 | F_FL1_ENABLE | F_CPL_ENABLE | F_RESPONSE_QUEUE_ENABLE | |
| 777 | V_CMDQ_PRIORITY(2) | F_DISABLE_CMDQ1_GTS | F_ISCSI_COALESCE | |
| 778 | V_RX_PKT_OFFSET(sge->rx_pkt_pad); |
| 779 | |
| 780 | #if defined(__BIG_ENDIAN_BITFIELD) |
| 781 | sge->sge_control |= F_ENABLE_BIG_ENDIAN; |
| 782 | #endif |
| 783 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 784 | /* Initialize no-resource timer */ |
| 785 | sge->intrtimer_nres = SGE_INTRTIMER_NRES * core_ticks_per_usec(ap); |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 786 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 787 | t1_sge_set_coalesce_params(sge, p); |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 788 | } |
| 789 | |
| 790 | /* |
| 791 | * Return the payload capacity of the jumbo free-list buffers. |
| 792 | */ |
| 793 | static inline unsigned int jumbo_payload_capacity(const struct sge *sge) |
| 794 | { |
| 795 | return sge->freelQ[sge->jumbo_fl].rx_buffer_size - |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 796 | sge->freelQ[sge->jumbo_fl].dma_offset - |
| 797 | sizeof(struct cpl_rx_data); |
| 798 | } |
| 799 | |
| 800 | /* |
| 801 | * Frees all SGE related resources and the sge structure itself |
| 802 | */ |
| 803 | void t1_sge_destroy(struct sge *sge) |
| 804 | { |
Stephen Hemminger | 56f643c | 2006-12-01 16:36:21 -0800 | [diff] [blame] | 805 | int i; |
| 806 | |
| 807 | for_each_port(sge->adapter, i) |
| 808 | free_percpu(sge->port_stats[i]); |
| 809 | |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 810 | kfree(sge->tx_sched); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 811 | free_tx_resources(sge); |
| 812 | free_rx_resources(sge); |
| 813 | kfree(sge); |
| 814 | } |
| 815 | |
| 816 | /* |
| 817 | * Allocates new RX buffers on the freelist Q (and tracks them on the freelist |
| 818 | * context Q) until the Q is full or alloc_skb fails. |
| 819 | * |
| 820 | * It is possible that the generation bits already match, indicating that the |
| 821 | * buffer is already valid and nothing needs to be done. This happens when we |
| 822 | * copied a received buffer into a new sk_buff during the interrupt processing. |
| 823 | * |
| 824 | * If the SGE doesn't automatically align packets properly (!sge->rx_pkt_pad), |
| 825 | * we specify a RX_OFFSET in order to make sure that the IP header is 4B |
| 826 | * aligned. |
| 827 | */ |
| 828 | static void refill_free_list(struct sge *sge, struct freelQ *q) |
| 829 | { |
| 830 | struct pci_dev *pdev = sge->adapter->pdev; |
| 831 | struct freelQ_ce *ce = &q->centries[q->pidx]; |
| 832 | struct freelQ_e *e = &q->entries[q->pidx]; |
| 833 | unsigned int dma_len = q->rx_buffer_size - q->dma_offset; |
| 834 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 835 | while (q->credits < q->size) { |
| 836 | struct sk_buff *skb; |
| 837 | dma_addr_t mapping; |
| 838 | |
| 839 | skb = alloc_skb(q->rx_buffer_size, GFP_ATOMIC); |
| 840 | if (!skb) |
| 841 | break; |
| 842 | |
| 843 | skb_reserve(skb, q->dma_offset); |
| 844 | mapping = pci_map_single(pdev, skb->data, dma_len, |
| 845 | PCI_DMA_FROMDEVICE); |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 846 | skb_reserve(skb, sge->rx_pkt_pad); |
| 847 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 848 | ce->skb = skb; |
| 849 | pci_unmap_addr_set(ce, dma_addr, mapping); |
| 850 | pci_unmap_len_set(ce, dma_len, dma_len); |
| 851 | e->addr_lo = (u32)mapping; |
| 852 | e->addr_hi = (u64)mapping >> 32; |
| 853 | e->len_gen = V_CMD_LEN(dma_len) | V_CMD_GEN1(q->genbit); |
| 854 | wmb(); |
| 855 | e->gen2 = V_CMD_GEN2(q->genbit); |
| 856 | |
| 857 | e++; |
| 858 | ce++; |
| 859 | if (++q->pidx == q->size) { |
| 860 | q->pidx = 0; |
| 861 | q->genbit ^= 1; |
| 862 | ce = q->centries; |
| 863 | e = q->entries; |
| 864 | } |
| 865 | q->credits++; |
| 866 | } |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 867 | } |
| 868 | |
| 869 | /* |
| 870 | * Calls refill_free_list for both free lists. If we cannot fill at least 1/4 |
| 871 | * of both rings, we go into 'few interrupt mode' in order to give the system |
| 872 | * time to free up resources. |
| 873 | */ |
| 874 | static void freelQs_empty(struct sge *sge) |
| 875 | { |
| 876 | struct adapter *adapter = sge->adapter; |
| 877 | u32 irq_reg = readl(adapter->regs + A_SG_INT_ENABLE); |
| 878 | u32 irqholdoff_reg; |
| 879 | |
| 880 | refill_free_list(sge, &sge->freelQ[0]); |
| 881 | refill_free_list(sge, &sge->freelQ[1]); |
| 882 | |
| 883 | if (sge->freelQ[0].credits > (sge->freelQ[0].size >> 2) && |
| 884 | sge->freelQ[1].credits > (sge->freelQ[1].size >> 2)) { |
| 885 | irq_reg |= F_FL_EXHAUSTED; |
| 886 | irqholdoff_reg = sge->fixed_intrtimer; |
| 887 | } else { |
| 888 | /* Clear the F_FL_EXHAUSTED interrupts for now */ |
| 889 | irq_reg &= ~F_FL_EXHAUSTED; |
| 890 | irqholdoff_reg = sge->intrtimer_nres; |
| 891 | } |
| 892 | writel(irqholdoff_reg, adapter->regs + A_SG_INTRTIMER); |
| 893 | writel(irq_reg, adapter->regs + A_SG_INT_ENABLE); |
| 894 | |
| 895 | /* We reenable the Qs to force a freelist GTS interrupt later */ |
| 896 | doorbell_pio(adapter, F_FL0_ENABLE | F_FL1_ENABLE); |
| 897 | } |
| 898 | |
| 899 | #define SGE_PL_INTR_MASK (F_PL_INTR_SGE_ERR | F_PL_INTR_SGE_DATA) |
| 900 | #define SGE_INT_FATAL (F_RESPQ_OVERFLOW | F_PACKET_TOO_BIG | F_PACKET_MISMATCH) |
| 901 | #define SGE_INT_ENABLE (F_RESPQ_EXHAUSTED | F_RESPQ_OVERFLOW | \ |
| 902 | F_FL_EXHAUSTED | F_PACKET_TOO_BIG | F_PACKET_MISMATCH) |
| 903 | |
| 904 | /* |
| 905 | * Disable SGE Interrupts |
| 906 | */ |
| 907 | void t1_sge_intr_disable(struct sge *sge) |
| 908 | { |
| 909 | u32 val = readl(sge->adapter->regs + A_PL_ENABLE); |
| 910 | |
| 911 | writel(val & ~SGE_PL_INTR_MASK, sge->adapter->regs + A_PL_ENABLE); |
| 912 | writel(0, sge->adapter->regs + A_SG_INT_ENABLE); |
| 913 | } |
| 914 | |
| 915 | /* |
| 916 | * Enable SGE interrupts. |
| 917 | */ |
| 918 | void t1_sge_intr_enable(struct sge *sge) |
| 919 | { |
| 920 | u32 en = SGE_INT_ENABLE; |
| 921 | u32 val = readl(sge->adapter->regs + A_PL_ENABLE); |
| 922 | |
| 923 | if (sge->adapter->flags & TSO_CAPABLE) |
| 924 | en &= ~F_PACKET_TOO_BIG; |
| 925 | writel(en, sge->adapter->regs + A_SG_INT_ENABLE); |
| 926 | writel(val | SGE_PL_INTR_MASK, sge->adapter->regs + A_PL_ENABLE); |
| 927 | } |
| 928 | |
| 929 | /* |
| 930 | * Clear SGE interrupts. |
| 931 | */ |
| 932 | void t1_sge_intr_clear(struct sge *sge) |
| 933 | { |
| 934 | writel(SGE_PL_INTR_MASK, sge->adapter->regs + A_PL_CAUSE); |
| 935 | writel(0xffffffff, sge->adapter->regs + A_SG_INT_CAUSE); |
| 936 | } |
| 937 | |
| 938 | /* |
| 939 | * SGE 'Error' interrupt handler |
| 940 | */ |
| 941 | int t1_sge_intr_error_handler(struct sge *sge) |
| 942 | { |
| 943 | struct adapter *adapter = sge->adapter; |
| 944 | u32 cause = readl(adapter->regs + A_SG_INT_CAUSE); |
| 945 | |
| 946 | if (adapter->flags & TSO_CAPABLE) |
| 947 | cause &= ~F_PACKET_TOO_BIG; |
| 948 | if (cause & F_RESPQ_EXHAUSTED) |
| 949 | sge->stats.respQ_empty++; |
| 950 | if (cause & F_RESPQ_OVERFLOW) { |
| 951 | sge->stats.respQ_overflow++; |
| 952 | CH_ALERT("%s: SGE response queue overflow\n", |
| 953 | adapter->name); |
| 954 | } |
| 955 | if (cause & F_FL_EXHAUSTED) { |
| 956 | sge->stats.freelistQ_empty++; |
| 957 | freelQs_empty(sge); |
| 958 | } |
| 959 | if (cause & F_PACKET_TOO_BIG) { |
| 960 | sge->stats.pkt_too_big++; |
| 961 | CH_ALERT("%s: SGE max packet size exceeded\n", |
| 962 | adapter->name); |
| 963 | } |
| 964 | if (cause & F_PACKET_MISMATCH) { |
| 965 | sge->stats.pkt_mismatch++; |
| 966 | CH_ALERT("%s: SGE packet mismatch\n", adapter->name); |
| 967 | } |
| 968 | if (cause & SGE_INT_FATAL) |
| 969 | t1_fatal_err(adapter); |
| 970 | |
| 971 | writel(cause, adapter->regs + A_SG_INT_CAUSE); |
| 972 | return 0; |
| 973 | } |
| 974 | |
Stephen Hemminger | 56f643c | 2006-12-01 16:36:21 -0800 | [diff] [blame] | 975 | const struct sge_intr_counts *t1_sge_get_intr_counts(const struct sge *sge) |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 976 | { |
| 977 | return &sge->stats; |
| 978 | } |
| 979 | |
Stephen Hemminger | 56f643c | 2006-12-01 16:36:21 -0800 | [diff] [blame] | 980 | void t1_sge_get_port_stats(const struct sge *sge, int port, |
| 981 | struct sge_port_stats *ss) |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 982 | { |
Stephen Hemminger | 56f643c | 2006-12-01 16:36:21 -0800 | [diff] [blame] | 983 | int cpu; |
| 984 | |
| 985 | memset(ss, 0, sizeof(*ss)); |
| 986 | for_each_possible_cpu(cpu) { |
| 987 | struct sge_port_stats *st = per_cpu_ptr(sge->port_stats[port], cpu); |
| 988 | |
Stephen Hemminger | 56f643c | 2006-12-01 16:36:21 -0800 | [diff] [blame] | 989 | ss->rx_cso_good += st->rx_cso_good; |
Stephen Hemminger | 56f643c | 2006-12-01 16:36:21 -0800 | [diff] [blame] | 990 | ss->tx_cso += st->tx_cso; |
| 991 | ss->tx_tso += st->tx_tso; |
Divy Le Ray | 7832ee0 | 2007-11-27 13:30:09 -0800 | [diff] [blame] | 992 | ss->tx_need_hdrroom += st->tx_need_hdrroom; |
Stephen Hemminger | 56f643c | 2006-12-01 16:36:21 -0800 | [diff] [blame] | 993 | ss->vlan_xtract += st->vlan_xtract; |
| 994 | ss->vlan_insert += st->vlan_insert; |
| 995 | } |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 996 | } |
| 997 | |
| 998 | /** |
| 999 | * recycle_fl_buf - recycle a free list buffer |
| 1000 | * @fl: the free list |
| 1001 | * @idx: index of buffer to recycle |
| 1002 | * |
| 1003 | * Recycles the specified buffer on the given free list by adding it at |
| 1004 | * the next available slot on the list. |
| 1005 | */ |
| 1006 | static void recycle_fl_buf(struct freelQ *fl, int idx) |
| 1007 | { |
| 1008 | struct freelQ_e *from = &fl->entries[idx]; |
| 1009 | struct freelQ_e *to = &fl->entries[fl->pidx]; |
| 1010 | |
| 1011 | fl->centries[fl->pidx] = fl->centries[idx]; |
| 1012 | to->addr_lo = from->addr_lo; |
| 1013 | to->addr_hi = from->addr_hi; |
| 1014 | to->len_gen = G_CMD_LEN(from->len_gen) | V_CMD_GEN1(fl->genbit); |
| 1015 | wmb(); |
| 1016 | to->gen2 = V_CMD_GEN2(fl->genbit); |
| 1017 | fl->credits++; |
| 1018 | |
| 1019 | if (++fl->pidx == fl->size) { |
| 1020 | fl->pidx = 0; |
| 1021 | fl->genbit ^= 1; |
| 1022 | } |
| 1023 | } |
| 1024 | |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1025 | static int copybreak __read_mostly = 256; |
| 1026 | module_param(copybreak, int, 0); |
| 1027 | MODULE_PARM_DESC(copybreak, "Receive copy threshold"); |
| 1028 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1029 | /** |
| 1030 | * get_packet - return the next ingress packet buffer |
| 1031 | * @pdev: the PCI device that received the packet |
| 1032 | * @fl: the SGE free list holding the packet |
| 1033 | * @len: the actual packet length, excluding any SGE padding |
| 1034 | * @dma_pad: padding at beginning of buffer left by SGE DMA |
| 1035 | * @skb_pad: padding to be used if the packet is copied |
| 1036 | * @copy_thres: length threshold under which a packet should be copied |
| 1037 | * @drop_thres: # of remaining buffers before we start dropping packets |
| 1038 | * |
| 1039 | * Get the next packet from a free list and complete setup of the |
| 1040 | * sk_buff. If the packet is small we make a copy and recycle the |
| 1041 | * original buffer, otherwise we use the original buffer itself. If a |
| 1042 | * positive drop threshold is supplied packets are dropped and their |
| 1043 | * buffers recycled if (a) the number of remaining buffers is under the |
| 1044 | * threshold and the packet is too big to copy, or (b) the packet should |
| 1045 | * be copied but there is no memory for the copy. |
| 1046 | */ |
| 1047 | static inline struct sk_buff *get_packet(struct pci_dev *pdev, |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1048 | struct freelQ *fl, unsigned int len) |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1049 | { |
| 1050 | struct sk_buff *skb; |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1051 | const struct freelQ_ce *ce = &fl->centries[fl->cidx]; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1052 | |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1053 | if (len < copybreak) { |
| 1054 | skb = alloc_skb(len + 2, GFP_ATOMIC); |
| 1055 | if (!skb) |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1056 | goto use_orig_buf; |
| 1057 | |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1058 | skb_reserve(skb, 2); /* align IP header */ |
| 1059 | skb_put(skb, len); |
| 1060 | pci_dma_sync_single_for_cpu(pdev, |
| 1061 | pci_unmap_addr(ce, dma_addr), |
| 1062 | pci_unmap_len(ce, dma_len), |
| 1063 | PCI_DMA_FROMDEVICE); |
Arnaldo Carvalho de Melo | d626f62 | 2007-03-27 18:55:52 -0300 | [diff] [blame] | 1064 | skb_copy_from_linear_data(ce->skb, skb->data, len); |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1065 | pci_dma_sync_single_for_device(pdev, |
| 1066 | pci_unmap_addr(ce, dma_addr), |
| 1067 | pci_unmap_len(ce, dma_len), |
| 1068 | PCI_DMA_FROMDEVICE); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1069 | recycle_fl_buf(fl, fl->cidx); |
| 1070 | return skb; |
| 1071 | } |
| 1072 | |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1073 | use_orig_buf: |
| 1074 | if (fl->credits < 2) { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1075 | recycle_fl_buf(fl, fl->cidx); |
| 1076 | return NULL; |
| 1077 | } |
| 1078 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1079 | pci_unmap_single(pdev, pci_unmap_addr(ce, dma_addr), |
| 1080 | pci_unmap_len(ce, dma_len), PCI_DMA_FROMDEVICE); |
| 1081 | skb = ce->skb; |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1082 | prefetch(skb->data); |
| 1083 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1084 | skb_put(skb, len); |
| 1085 | return skb; |
| 1086 | } |
| 1087 | |
| 1088 | /** |
| 1089 | * unexpected_offload - handle an unexpected offload packet |
| 1090 | * @adapter: the adapter |
| 1091 | * @fl: the free list that received the packet |
| 1092 | * |
| 1093 | * Called when we receive an unexpected offload packet (e.g., the TOE |
| 1094 | * function is disabled or the card is a NIC). Prints a message and |
| 1095 | * recycles the buffer. |
| 1096 | */ |
| 1097 | static void unexpected_offload(struct adapter *adapter, struct freelQ *fl) |
| 1098 | { |
| 1099 | struct freelQ_ce *ce = &fl->centries[fl->cidx]; |
| 1100 | struct sk_buff *skb = ce->skb; |
| 1101 | |
| 1102 | pci_dma_sync_single_for_cpu(adapter->pdev, pci_unmap_addr(ce, dma_addr), |
| 1103 | pci_unmap_len(ce, dma_len), PCI_DMA_FROMDEVICE); |
| 1104 | CH_ERR("%s: unexpected offload packet, cmd %u\n", |
| 1105 | adapter->name, *skb->data); |
| 1106 | recycle_fl_buf(fl, fl->cidx); |
| 1107 | } |
| 1108 | |
| 1109 | /* |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1110 | * T1/T2 SGE limits the maximum DMA size per TX descriptor to |
| 1111 | * SGE_TX_DESC_MAX_PLEN (16KB). If the PAGE_SIZE is larger than 16KB, the |
| 1112 | * stack might send more than SGE_TX_DESC_MAX_PLEN in a contiguous manner. |
| 1113 | * Note that the *_large_page_tx_descs stuff will be optimized out when |
| 1114 | * PAGE_SIZE <= SGE_TX_DESC_MAX_PLEN. |
| 1115 | * |
| 1116 | * compute_large_page_descs() computes how many additional descriptors are |
| 1117 | * required to break down the stack's request. |
| 1118 | */ |
| 1119 | static inline unsigned int compute_large_page_tx_descs(struct sk_buff *skb) |
| 1120 | { |
| 1121 | unsigned int count = 0; |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 1122 | |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1123 | if (PAGE_SIZE > SGE_TX_DESC_MAX_PLEN) { |
| 1124 | unsigned int nfrags = skb_shinfo(skb)->nr_frags; |
| 1125 | unsigned int i, len = skb->len - skb->data_len; |
| 1126 | while (len > SGE_TX_DESC_MAX_PLEN) { |
| 1127 | count++; |
| 1128 | len -= SGE_TX_DESC_MAX_PLEN; |
| 1129 | } |
| 1130 | for (i = 0; nfrags--; i++) { |
| 1131 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
| 1132 | len = frag->size; |
| 1133 | while (len > SGE_TX_DESC_MAX_PLEN) { |
| 1134 | count++; |
| 1135 | len -= SGE_TX_DESC_MAX_PLEN; |
| 1136 | } |
| 1137 | } |
| 1138 | } |
| 1139 | return count; |
| 1140 | } |
| 1141 | |
| 1142 | /* |
| 1143 | * Write a cmdQ entry. |
| 1144 | * |
| 1145 | * Since this function writes the 'flags' field, it must not be used to |
| 1146 | * write the first cmdQ entry. |
| 1147 | */ |
| 1148 | static inline void write_tx_desc(struct cmdQ_e *e, dma_addr_t mapping, |
| 1149 | unsigned int len, unsigned int gen, |
| 1150 | unsigned int eop) |
| 1151 | { |
| 1152 | if (unlikely(len > SGE_TX_DESC_MAX_PLEN)) |
| 1153 | BUG(); |
| 1154 | e->addr_lo = (u32)mapping; |
| 1155 | e->addr_hi = (u64)mapping >> 32; |
| 1156 | e->len_gen = V_CMD_LEN(len) | V_CMD_GEN1(gen); |
| 1157 | e->flags = F_CMD_DATAVALID | V_CMD_EOP(eop) | V_CMD_GEN2(gen); |
| 1158 | } |
| 1159 | |
| 1160 | /* |
| 1161 | * See comment for previous function. |
| 1162 | * |
| 1163 | * write_tx_descs_large_page() writes additional SGE tx descriptors if |
| 1164 | * *desc_len exceeds HW's capability. |
| 1165 | */ |
| 1166 | static inline unsigned int write_large_page_tx_descs(unsigned int pidx, |
| 1167 | struct cmdQ_e **e, |
| 1168 | struct cmdQ_ce **ce, |
| 1169 | unsigned int *gen, |
| 1170 | dma_addr_t *desc_mapping, |
| 1171 | unsigned int *desc_len, |
| 1172 | unsigned int nfrags, |
| 1173 | struct cmdQ *q) |
| 1174 | { |
| 1175 | if (PAGE_SIZE > SGE_TX_DESC_MAX_PLEN) { |
| 1176 | struct cmdQ_e *e1 = *e; |
| 1177 | struct cmdQ_ce *ce1 = *ce; |
| 1178 | |
| 1179 | while (*desc_len > SGE_TX_DESC_MAX_PLEN) { |
| 1180 | *desc_len -= SGE_TX_DESC_MAX_PLEN; |
| 1181 | write_tx_desc(e1, *desc_mapping, SGE_TX_DESC_MAX_PLEN, |
| 1182 | *gen, nfrags == 0 && *desc_len == 0); |
| 1183 | ce1->skb = NULL; |
| 1184 | pci_unmap_len_set(ce1, dma_len, 0); |
| 1185 | *desc_mapping += SGE_TX_DESC_MAX_PLEN; |
| 1186 | if (*desc_len) { |
| 1187 | ce1++; |
| 1188 | e1++; |
| 1189 | if (++pidx == q->size) { |
| 1190 | pidx = 0; |
| 1191 | *gen ^= 1; |
| 1192 | ce1 = q->centries; |
| 1193 | e1 = q->entries; |
| 1194 | } |
| 1195 | } |
| 1196 | } |
| 1197 | *e = e1; |
| 1198 | *ce = ce1; |
| 1199 | } |
| 1200 | return pidx; |
| 1201 | } |
| 1202 | |
| 1203 | /* |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1204 | * Write the command descriptors to transmit the given skb starting at |
| 1205 | * descriptor pidx with the given generation. |
| 1206 | */ |
| 1207 | static inline void write_tx_descs(struct adapter *adapter, struct sk_buff *skb, |
| 1208 | unsigned int pidx, unsigned int gen, |
| 1209 | struct cmdQ *q) |
| 1210 | { |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1211 | dma_addr_t mapping, desc_mapping; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1212 | struct cmdQ_e *e, *e1; |
| 1213 | struct cmdQ_ce *ce; |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1214 | unsigned int i, flags, first_desc_len, desc_len, |
| 1215 | nfrags = skb_shinfo(skb)->nr_frags; |
| 1216 | |
| 1217 | e = e1 = &q->entries[pidx]; |
| 1218 | ce = &q->centries[pidx]; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1219 | |
| 1220 | mapping = pci_map_single(adapter->pdev, skb->data, |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1221 | skb->len - skb->data_len, PCI_DMA_TODEVICE); |
| 1222 | |
| 1223 | desc_mapping = mapping; |
| 1224 | desc_len = skb->len - skb->data_len; |
| 1225 | |
| 1226 | flags = F_CMD_DATAVALID | F_CMD_SOP | |
| 1227 | V_CMD_EOP(nfrags == 0 && desc_len <= SGE_TX_DESC_MAX_PLEN) | |
| 1228 | V_CMD_GEN2(gen); |
| 1229 | first_desc_len = (desc_len <= SGE_TX_DESC_MAX_PLEN) ? |
| 1230 | desc_len : SGE_TX_DESC_MAX_PLEN; |
| 1231 | e->addr_lo = (u32)desc_mapping; |
| 1232 | e->addr_hi = (u64)desc_mapping >> 32; |
| 1233 | e->len_gen = V_CMD_LEN(first_desc_len) | V_CMD_GEN1(gen); |
| 1234 | ce->skb = NULL; |
| 1235 | pci_unmap_len_set(ce, dma_len, 0); |
| 1236 | |
| 1237 | if (PAGE_SIZE > SGE_TX_DESC_MAX_PLEN && |
| 1238 | desc_len > SGE_TX_DESC_MAX_PLEN) { |
| 1239 | desc_mapping += first_desc_len; |
| 1240 | desc_len -= first_desc_len; |
| 1241 | e1++; |
| 1242 | ce++; |
| 1243 | if (++pidx == q->size) { |
| 1244 | pidx = 0; |
| 1245 | gen ^= 1; |
| 1246 | e1 = q->entries; |
| 1247 | ce = q->centries; |
| 1248 | } |
| 1249 | pidx = write_large_page_tx_descs(pidx, &e1, &ce, &gen, |
| 1250 | &desc_mapping, &desc_len, |
| 1251 | nfrags, q); |
| 1252 | |
| 1253 | if (likely(desc_len)) |
| 1254 | write_tx_desc(e1, desc_mapping, desc_len, gen, |
| 1255 | nfrags == 0); |
| 1256 | } |
| 1257 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1258 | ce->skb = NULL; |
| 1259 | pci_unmap_addr_set(ce, dma_addr, mapping); |
| 1260 | pci_unmap_len_set(ce, dma_len, skb->len - skb->data_len); |
| 1261 | |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1262 | for (i = 0; nfrags--; i++) { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1263 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1264 | e1++; |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1265 | ce++; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1266 | if (++pidx == q->size) { |
| 1267 | pidx = 0; |
| 1268 | gen ^= 1; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1269 | e1 = q->entries; |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1270 | ce = q->centries; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1271 | } |
| 1272 | |
| 1273 | mapping = pci_map_page(adapter->pdev, frag->page, |
| 1274 | frag->page_offset, frag->size, |
| 1275 | PCI_DMA_TODEVICE); |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1276 | desc_mapping = mapping; |
| 1277 | desc_len = frag->size; |
| 1278 | |
| 1279 | pidx = write_large_page_tx_descs(pidx, &e1, &ce, &gen, |
| 1280 | &desc_mapping, &desc_len, |
| 1281 | nfrags, q); |
| 1282 | if (likely(desc_len)) |
| 1283 | write_tx_desc(e1, desc_mapping, desc_len, gen, |
| 1284 | nfrags == 0); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1285 | ce->skb = NULL; |
| 1286 | pci_unmap_addr_set(ce, dma_addr, mapping); |
| 1287 | pci_unmap_len_set(ce, dma_len, frag->size); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1288 | } |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1289 | ce->skb = skb; |
| 1290 | wmb(); |
| 1291 | e->flags = flags; |
| 1292 | } |
| 1293 | |
| 1294 | /* |
| 1295 | * Clean up completed Tx buffers. |
| 1296 | */ |
| 1297 | static inline void reclaim_completed_tx(struct sge *sge, struct cmdQ *q) |
| 1298 | { |
| 1299 | unsigned int reclaim = q->processed - q->cleaned; |
| 1300 | |
| 1301 | if (reclaim) { |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1302 | pr_debug("reclaim_completed_tx processed:%d cleaned:%d\n", |
| 1303 | q->processed, q->cleaned); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1304 | free_cmdQ_buffers(sge, q, reclaim); |
| 1305 | q->cleaned += reclaim; |
| 1306 | } |
| 1307 | } |
| 1308 | |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1309 | /* |
| 1310 | * Called from tasklet. Checks the scheduler for any |
| 1311 | * pending skbs that can be sent. |
| 1312 | */ |
| 1313 | static void restart_sched(unsigned long arg) |
| 1314 | { |
| 1315 | struct sge *sge = (struct sge *) arg; |
| 1316 | struct adapter *adapter = sge->adapter; |
| 1317 | struct cmdQ *q = &sge->cmdQ[0]; |
| 1318 | struct sk_buff *skb; |
| 1319 | unsigned int credits, queued_skb = 0; |
| 1320 | |
| 1321 | spin_lock(&q->lock); |
| 1322 | reclaim_completed_tx(sge, q); |
| 1323 | |
| 1324 | credits = q->size - q->in_use; |
| 1325 | pr_debug("restart_sched credits=%d\n", credits); |
| 1326 | while ((skb = sched_skb(sge, NULL, credits)) != NULL) { |
| 1327 | unsigned int genbit, pidx, count; |
| 1328 | count = 1 + skb_shinfo(skb)->nr_frags; |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 1329 | count += compute_large_page_tx_descs(skb); |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1330 | q->in_use += count; |
| 1331 | genbit = q->genbit; |
| 1332 | pidx = q->pidx; |
| 1333 | q->pidx += count; |
| 1334 | if (q->pidx >= q->size) { |
| 1335 | q->pidx -= q->size; |
| 1336 | q->genbit ^= 1; |
| 1337 | } |
| 1338 | write_tx_descs(adapter, skb, pidx, genbit, q); |
| 1339 | credits = q->size - q->in_use; |
| 1340 | queued_skb = 1; |
| 1341 | } |
| 1342 | |
| 1343 | if (queued_skb) { |
| 1344 | clear_bit(CMDQ_STAT_LAST_PKT_DB, &q->status); |
| 1345 | if (test_and_set_bit(CMDQ_STAT_RUNNING, &q->status) == 0) { |
| 1346 | set_bit(CMDQ_STAT_LAST_PKT_DB, &q->status); |
| 1347 | writel(F_CMDQ0_ENABLE, adapter->regs + A_SG_DOORBELL); |
| 1348 | } |
| 1349 | } |
| 1350 | spin_unlock(&q->lock); |
| 1351 | } |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1352 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1353 | /** |
| 1354 | * sge_rx - process an ingress ethernet packet |
| 1355 | * @sge: the sge structure |
| 1356 | * @fl: the free list that contains the packet buffer |
| 1357 | * @len: the packet length |
| 1358 | * |
| 1359 | * Process an ingress ethernet pakcet and deliver it to the stack. |
| 1360 | */ |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1361 | static void sge_rx(struct sge *sge, struct freelQ *fl, unsigned int len) |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1362 | { |
| 1363 | struct sk_buff *skb; |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1364 | const struct cpl_rx_pkt *p; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1365 | struct adapter *adapter = sge->adapter; |
Stephen Hemminger | 56f643c | 2006-12-01 16:36:21 -0800 | [diff] [blame] | 1366 | struct sge_port_stats *st; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1367 | |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1368 | skb = get_packet(adapter->pdev, fl, len - sge->rx_pkt_pad); |
Stephen Hemminger | 56f643c | 2006-12-01 16:36:21 -0800 | [diff] [blame] | 1369 | if (unlikely(!skb)) { |
| 1370 | sge->stats.rx_drops++; |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1371 | return; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1372 | } |
| 1373 | |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1374 | p = (const struct cpl_rx_pkt *) skb->data; |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1375 | if (p->iff >= adapter->params.nports) { |
| 1376 | kfree_skb(skb); |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1377 | return; |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1378 | } |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1379 | __skb_pull(skb, sizeof(*p)); |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1380 | |
Stephen Hemminger | 56f643c | 2006-12-01 16:36:21 -0800 | [diff] [blame] | 1381 | st = per_cpu_ptr(sge->port_stats[p->iff], smp_processor_id()); |
Stephen Hemminger | 56f643c | 2006-12-01 16:36:21 -0800 | [diff] [blame] | 1382 | |
Arnaldo Carvalho de Melo | 4c13eb6 | 2007-04-25 17:40:23 -0700 | [diff] [blame] | 1383 | skb->protocol = eth_type_trans(skb, adapter->port[p->iff].dev); |
Divy Le Ray | 7de6af0 | 2007-11-15 15:06:32 -0800 | [diff] [blame] | 1384 | skb->dev->last_rx = jiffies; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1385 | if ((adapter->flags & RX_CSUM_ENABLED) && p->csum == 0xffff && |
| 1386 | skb->protocol == htons(ETH_P_IP) && |
| 1387 | (skb->data[9] == IPPROTO_TCP || skb->data[9] == IPPROTO_UDP)) { |
Stephen Hemminger | 56f643c | 2006-12-01 16:36:21 -0800 | [diff] [blame] | 1388 | ++st->rx_cso_good; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1389 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 1390 | } else |
| 1391 | skb->ip_summed = CHECKSUM_NONE; |
| 1392 | |
| 1393 | if (unlikely(adapter->vlan_grp && p->vlan_valid)) { |
Stephen Hemminger | 56f643c | 2006-12-01 16:36:21 -0800 | [diff] [blame] | 1394 | st->vlan_xtract++; |
Stephen Hemminger | 7fe26a6 | 2006-12-08 11:08:33 -0800 | [diff] [blame] | 1395 | #ifdef CONFIG_CHELSIO_T1_NAPI |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1396 | vlan_hwaccel_receive_skb(skb, adapter->vlan_grp, |
| 1397 | ntohs(p->vlan)); |
Stephen Hemminger | 7fe26a6 | 2006-12-08 11:08:33 -0800 | [diff] [blame] | 1398 | #else |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1399 | vlan_hwaccel_rx(skb, adapter->vlan_grp, |
| 1400 | ntohs(p->vlan)); |
Stephen Hemminger | 7fe26a6 | 2006-12-08 11:08:33 -0800 | [diff] [blame] | 1401 | #endif |
| 1402 | } else { |
| 1403 | #ifdef CONFIG_CHELSIO_T1_NAPI |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1404 | netif_receive_skb(skb); |
Stephen Hemminger | 7fe26a6 | 2006-12-08 11:08:33 -0800 | [diff] [blame] | 1405 | #else |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1406 | netif_rx(skb); |
Stephen Hemminger | 7fe26a6 | 2006-12-08 11:08:33 -0800 | [diff] [blame] | 1407 | #endif |
| 1408 | } |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1409 | } |
| 1410 | |
| 1411 | /* |
| 1412 | * Returns true if a command queue has enough available descriptors that |
| 1413 | * we can resume Tx operation after temporarily disabling its packet queue. |
| 1414 | */ |
| 1415 | static inline int enough_free_Tx_descs(const struct cmdQ *q) |
| 1416 | { |
| 1417 | unsigned int r = q->processed - q->cleaned; |
| 1418 | |
| 1419 | return q->in_use - r < (q->size >> 1); |
| 1420 | } |
| 1421 | |
| 1422 | /* |
| 1423 | * Called when sufficient space has become available in the SGE command queues |
| 1424 | * after the Tx packet schedulers have been suspended to restart the Tx path. |
| 1425 | */ |
| 1426 | static void restart_tx_queues(struct sge *sge) |
| 1427 | { |
| 1428 | struct adapter *adap = sge->adapter; |
Francois Romieu | 3e0f75b | 2006-12-05 23:57:41 +0100 | [diff] [blame] | 1429 | int i; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1430 | |
Francois Romieu | 3e0f75b | 2006-12-05 23:57:41 +0100 | [diff] [blame] | 1431 | if (!enough_free_Tx_descs(&sge->cmdQ[0])) |
| 1432 | return; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1433 | |
Francois Romieu | 3e0f75b | 2006-12-05 23:57:41 +0100 | [diff] [blame] | 1434 | for_each_port(adap, i) { |
| 1435 | struct net_device *nd = adap->port[i].dev; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1436 | |
Francois Romieu | 3e0f75b | 2006-12-05 23:57:41 +0100 | [diff] [blame] | 1437 | if (test_and_clear_bit(nd->if_port, &sge->stopped_tx_queues) && |
| 1438 | netif_running(nd)) { |
| 1439 | sge->stats.cmdQ_restarted[2]++; |
| 1440 | netif_wake_queue(nd); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1441 | } |
| 1442 | } |
| 1443 | } |
| 1444 | |
| 1445 | /* |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 1446 | * update_tx_info is called from the interrupt handler/NAPI to return cmdQ0 |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1447 | * information. |
| 1448 | */ |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 1449 | static unsigned int update_tx_info(struct adapter *adapter, |
| 1450 | unsigned int flags, |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1451 | unsigned int pr0) |
| 1452 | { |
| 1453 | struct sge *sge = adapter->sge; |
| 1454 | struct cmdQ *cmdq = &sge->cmdQ[0]; |
| 1455 | |
| 1456 | cmdq->processed += pr0; |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1457 | if (flags & (F_FL0_ENABLE | F_FL1_ENABLE)) { |
| 1458 | freelQs_empty(sge); |
| 1459 | flags &= ~(F_FL0_ENABLE | F_FL1_ENABLE); |
| 1460 | } |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1461 | if (flags & F_CMDQ0_ENABLE) { |
| 1462 | clear_bit(CMDQ_STAT_RUNNING, &cmdq->status); |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1463 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1464 | if (cmdq->cleaned + cmdq->in_use != cmdq->processed && |
| 1465 | !test_and_set_bit(CMDQ_STAT_LAST_PKT_DB, &cmdq->status)) { |
| 1466 | set_bit(CMDQ_STAT_RUNNING, &cmdq->status); |
| 1467 | writel(F_CMDQ0_ENABLE, adapter->regs + A_SG_DOORBELL); |
| 1468 | } |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1469 | if (sge->tx_sched) |
| 1470 | tasklet_hi_schedule(&sge->tx_sched->sched_tsk); |
| 1471 | |
| 1472 | flags &= ~F_CMDQ0_ENABLE; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1473 | } |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1474 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1475 | if (unlikely(sge->stopped_tx_queues != 0)) |
| 1476 | restart_tx_queues(sge); |
| 1477 | |
| 1478 | return flags; |
| 1479 | } |
| 1480 | |
| 1481 | /* |
| 1482 | * Process SGE responses, up to the supplied budget. Returns the number of |
| 1483 | * responses processed. A negative budget is effectively unlimited. |
| 1484 | */ |
| 1485 | static int process_responses(struct adapter *adapter, int budget) |
| 1486 | { |
| 1487 | struct sge *sge = adapter->sge; |
| 1488 | struct respQ *q = &sge->respQ; |
| 1489 | struct respQ_e *e = &q->entries[q->cidx]; |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1490 | int done = 0; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1491 | unsigned int flags = 0; |
| 1492 | unsigned int cmdq_processed[SGE_CMDQ_N] = {0, 0}; |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 1493 | |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1494 | while (done < budget && e->GenerationBit == q->genbit) { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1495 | flags |= e->Qsleeping; |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 1496 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1497 | cmdq_processed[0] += e->Cmdq0CreditReturn; |
| 1498 | cmdq_processed[1] += e->Cmdq1CreditReturn; |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 1499 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1500 | /* We batch updates to the TX side to avoid cacheline |
| 1501 | * ping-pong of TX state information on MP where the sender |
| 1502 | * might run on a different CPU than this function... |
| 1503 | */ |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1504 | if (unlikely((flags & F_CMDQ0_ENABLE) || cmdq_processed[0] > 64)) { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1505 | flags = update_tx_info(adapter, flags, cmdq_processed[0]); |
| 1506 | cmdq_processed[0] = 0; |
| 1507 | } |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1508 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1509 | if (unlikely(cmdq_processed[1] > 16)) { |
| 1510 | sge->cmdQ[1].processed += cmdq_processed[1]; |
| 1511 | cmdq_processed[1] = 0; |
| 1512 | } |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1513 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1514 | if (likely(e->DataValid)) { |
| 1515 | struct freelQ *fl = &sge->freelQ[e->FreelistQid]; |
| 1516 | |
Eric Sesterhenn | 5d9428d | 2006-04-02 13:52:48 +0200 | [diff] [blame] | 1517 | BUG_ON(!e->Sop || !e->Eop); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1518 | if (unlikely(e->Offload)) |
| 1519 | unexpected_offload(adapter, fl); |
| 1520 | else |
| 1521 | sge_rx(sge, fl, e->BufferLength); |
| 1522 | |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1523 | ++done; |
| 1524 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1525 | /* |
| 1526 | * Note: this depends on each packet consuming a |
| 1527 | * single free-list buffer; cf. the BUG above. |
| 1528 | */ |
| 1529 | if (++fl->cidx == fl->size) |
| 1530 | fl->cidx = 0; |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1531 | prefetch(fl->centries[fl->cidx].skb); |
| 1532 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1533 | if (unlikely(--fl->credits < |
| 1534 | fl->size - SGE_FREEL_REFILL_THRESH)) |
| 1535 | refill_free_list(sge, fl); |
| 1536 | } else |
| 1537 | sge->stats.pure_rsps++; |
| 1538 | |
| 1539 | e++; |
| 1540 | if (unlikely(++q->cidx == q->size)) { |
| 1541 | q->cidx = 0; |
| 1542 | q->genbit ^= 1; |
| 1543 | e = q->entries; |
| 1544 | } |
| 1545 | prefetch(e); |
| 1546 | |
| 1547 | if (++q->credits > SGE_RESPQ_REPLENISH_THRES) { |
| 1548 | writel(q->credits, adapter->regs + A_SG_RSPQUEUECREDIT); |
| 1549 | q->credits = 0; |
| 1550 | } |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1551 | } |
| 1552 | |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 1553 | flags = update_tx_info(adapter, flags, cmdq_processed[0]); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1554 | sge->cmdQ[1].processed += cmdq_processed[1]; |
| 1555 | |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1556 | return done; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1557 | } |
| 1558 | |
Stephen Hemminger | 3de00b8 | 2007-01-08 11:26:30 -0800 | [diff] [blame] | 1559 | static inline int responses_pending(const struct adapter *adapter) |
| 1560 | { |
| 1561 | const struct respQ *Q = &adapter->sge->respQ; |
| 1562 | const struct respQ_e *e = &Q->entries[Q->cidx]; |
| 1563 | |
| 1564 | return (e->GenerationBit == Q->genbit); |
| 1565 | } |
| 1566 | |
Stephen Hemminger | 7fe26a6 | 2006-12-08 11:08:33 -0800 | [diff] [blame] | 1567 | #ifdef CONFIG_CHELSIO_T1_NAPI |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1568 | /* |
| 1569 | * A simpler version of process_responses() that handles only pure (i.e., |
| 1570 | * non data-carrying) responses. Such respones are too light-weight to justify |
| 1571 | * calling a softirq when using NAPI, so we handle them specially in hard |
| 1572 | * interrupt context. The function is called with a pointer to a response, |
| 1573 | * which the caller must ensure is a valid pure response. Returns 1 if it |
| 1574 | * encounters a valid data-carrying response, 0 otherwise. |
| 1575 | */ |
Stephen Hemminger | 3de00b8 | 2007-01-08 11:26:30 -0800 | [diff] [blame] | 1576 | static int process_pure_responses(struct adapter *adapter) |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1577 | { |
| 1578 | struct sge *sge = adapter->sge; |
| 1579 | struct respQ *q = &sge->respQ; |
Stephen Hemminger | 3de00b8 | 2007-01-08 11:26:30 -0800 | [diff] [blame] | 1580 | struct respQ_e *e = &q->entries[q->cidx]; |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1581 | const struct freelQ *fl = &sge->freelQ[e->FreelistQid]; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1582 | unsigned int flags = 0; |
| 1583 | unsigned int cmdq_processed[SGE_CMDQ_N] = {0, 0}; |
| 1584 | |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1585 | prefetch(fl->centries[fl->cidx].skb); |
Stephen Hemminger | 3de00b8 | 2007-01-08 11:26:30 -0800 | [diff] [blame] | 1586 | if (e->DataValid) |
| 1587 | return 1; |
Stephen Hemminger | 24a427c | 2007-01-08 11:26:12 -0800 | [diff] [blame] | 1588 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1589 | do { |
| 1590 | flags |= e->Qsleeping; |
| 1591 | |
| 1592 | cmdq_processed[0] += e->Cmdq0CreditReturn; |
| 1593 | cmdq_processed[1] += e->Cmdq1CreditReturn; |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 1594 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1595 | e++; |
| 1596 | if (unlikely(++q->cidx == q->size)) { |
| 1597 | q->cidx = 0; |
| 1598 | q->genbit ^= 1; |
| 1599 | e = q->entries; |
| 1600 | } |
| 1601 | prefetch(e); |
| 1602 | |
| 1603 | if (++q->credits > SGE_RESPQ_REPLENISH_THRES) { |
| 1604 | writel(q->credits, adapter->regs + A_SG_RSPQUEUECREDIT); |
| 1605 | q->credits = 0; |
| 1606 | } |
| 1607 | sge->stats.pure_rsps++; |
| 1608 | } while (e->GenerationBit == q->genbit && !e->DataValid); |
| 1609 | |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 1610 | flags = update_tx_info(adapter, flags, cmdq_processed[0]); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1611 | sge->cmdQ[1].processed += cmdq_processed[1]; |
| 1612 | |
| 1613 | return e->GenerationBit == q->genbit; |
| 1614 | } |
| 1615 | |
| 1616 | /* |
| 1617 | * Handler for new data events when using NAPI. This does not need any locking |
| 1618 | * or protection from interrupts as data interrupts are off at this point and |
| 1619 | * other adapter interrupts do not interfere. |
| 1620 | */ |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1621 | int t1_poll(struct napi_struct *napi, int budget) |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1622 | { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1623 | struct adapter *adapter = container_of(napi, struct adapter, napi); |
| 1624 | struct net_device *dev = adapter->port[0].dev; |
Divy Le Ray | 445cf80 | 2007-11-27 13:30:15 -0800 | [diff] [blame] | 1625 | int work_done = process_responses(adapter, budget); |
Stephen Hemminger | 7fe26a6 | 2006-12-08 11:08:33 -0800 | [diff] [blame] | 1626 | |
Divy Le Ray | 445cf80 | 2007-11-27 13:30:15 -0800 | [diff] [blame] | 1627 | if (likely(work_done < budget)) { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1628 | netif_rx_complete(dev, napi); |
| 1629 | writel(adapter->sge->respQ.cidx, |
| 1630 | adapter->regs + A_SG_SLEEPING); |
| 1631 | } |
| 1632 | return work_done; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1633 | } |
| 1634 | |
| 1635 | /* |
| 1636 | * NAPI version of the main interrupt handler. |
| 1637 | */ |
Stephen Hemminger | 7fe26a6 | 2006-12-08 11:08:33 -0800 | [diff] [blame] | 1638 | irqreturn_t t1_interrupt(int irq, void *data) |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1639 | { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1640 | struct adapter *adapter = data; |
| 1641 | struct sge *sge = adapter->sge; |
Stephen Hemminger | 3de00b8 | 2007-01-08 11:26:30 -0800 | [diff] [blame] | 1642 | int handled; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1643 | |
Stephen Hemminger | 3de00b8 | 2007-01-08 11:26:30 -0800 | [diff] [blame] | 1644 | if (likely(responses_pending(adapter))) { |
| 1645 | struct net_device *dev = sge->netdev; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1646 | |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 1647 | writel(F_PL_INTR_SGE_DATA, adapter->regs + A_PL_CAUSE); |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1648 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1649 | if (napi_schedule_prep(&adapter->napi)) { |
Stephen Hemminger | 3de00b8 | 2007-01-08 11:26:30 -0800 | [diff] [blame] | 1650 | if (process_pure_responses(adapter)) |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1651 | __netif_rx_schedule(dev, &adapter->napi); |
Stephen Hemminger | 3de00b8 | 2007-01-08 11:26:30 -0800 | [diff] [blame] | 1652 | else { |
| 1653 | /* no data, no NAPI needed */ |
| 1654 | writel(sge->respQ.cidx, adapter->regs + A_SG_SLEEPING); |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 1655 | napi_enable(&adapter->napi); /* undo schedule_prep */ |
Stephen Hemminger | 7fe26a6 | 2006-12-08 11:08:33 -0800 | [diff] [blame] | 1656 | } |
Stephen Hemminger | 7fe26a6 | 2006-12-08 11:08:33 -0800 | [diff] [blame] | 1657 | } |
Stephen Hemminger | 3de00b8 | 2007-01-08 11:26:30 -0800 | [diff] [blame] | 1658 | return IRQ_HANDLED; |
| 1659 | } |
| 1660 | |
| 1661 | spin_lock(&adapter->async_lock); |
| 1662 | handled = t1_slow_intr_handler(adapter); |
| 1663 | spin_unlock(&adapter->async_lock); |
Stephen Hemminger | 7fe26a6 | 2006-12-08 11:08:33 -0800 | [diff] [blame] | 1664 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1665 | if (!handled) |
| 1666 | sge->stats.unhandled_irqs++; |
Stephen Hemminger | 3de00b8 | 2007-01-08 11:26:30 -0800 | [diff] [blame] | 1667 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1668 | return IRQ_RETVAL(handled != 0); |
| 1669 | } |
| 1670 | |
Stephen Hemminger | 7fe26a6 | 2006-12-08 11:08:33 -0800 | [diff] [blame] | 1671 | #else |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1672 | /* |
| 1673 | * Main interrupt handler, optimized assuming that we took a 'DATA' |
| 1674 | * interrupt. |
| 1675 | * |
| 1676 | * 1. Clear the interrupt |
| 1677 | * 2. Loop while we find valid descriptors and process them; accumulate |
| 1678 | * information that can be processed after the loop |
| 1679 | * 3. Tell the SGE at which index we stopped processing descriptors |
| 1680 | * 4. Bookkeeping; free TX buffers, ring doorbell if there are any |
| 1681 | * outstanding TX buffers waiting, replenish RX buffers, potentially |
| 1682 | * reenable upper layers if they were turned off due to lack of TX |
| 1683 | * resources which are available again. |
| 1684 | * 5. If we took an interrupt, but no valid respQ descriptors was found we |
| 1685 | * let the slow_intr_handler run and do error handling. |
| 1686 | */ |
Stephen Hemminger | 7fe26a6 | 2006-12-08 11:08:33 -0800 | [diff] [blame] | 1687 | irqreturn_t t1_interrupt(int irq, void *cookie) |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1688 | { |
| 1689 | int work_done; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1690 | struct adapter *adapter = cookie; |
Roland Dreier | 54d3e56 | 2007-02-26 14:58:49 -0800 | [diff] [blame] | 1691 | struct respQ *Q = &adapter->sge->respQ; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1692 | |
| 1693 | spin_lock(&adapter->async_lock); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1694 | |
| 1695 | writel(F_PL_INTR_SGE_DATA, adapter->regs + A_PL_CAUSE); |
| 1696 | |
Andrew Morton | b9662d0 | 2007-01-30 00:33:04 -0800 | [diff] [blame] | 1697 | if (likely(responses_pending(adapter))) |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1698 | work_done = process_responses(adapter, -1); |
| 1699 | else |
| 1700 | work_done = t1_slow_intr_handler(adapter); |
| 1701 | |
| 1702 | /* |
| 1703 | * The unconditional clearing of the PL_CAUSE above may have raced |
| 1704 | * with DMA completion and the corresponding generation of a response |
| 1705 | * to cause us to miss the resulting data interrupt. The next write |
| 1706 | * is also unconditional to recover the missed interrupt and render |
| 1707 | * this race harmless. |
| 1708 | */ |
| 1709 | writel(Q->cidx, adapter->regs + A_SG_SLEEPING); |
| 1710 | |
| 1711 | if (!work_done) |
| 1712 | adapter->sge->stats.unhandled_irqs++; |
| 1713 | spin_unlock(&adapter->async_lock); |
| 1714 | return IRQ_RETVAL(work_done != 0); |
| 1715 | } |
Stephen Hemminger | 7fe26a6 | 2006-12-08 11:08:33 -0800 | [diff] [blame] | 1716 | #endif |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1717 | |
| 1718 | /* |
| 1719 | * Enqueues the sk_buff onto the cmdQ[qid] and has hardware fetch it. |
| 1720 | * |
| 1721 | * The code figures out how many entries the sk_buff will require in the |
| 1722 | * cmdQ and updates the cmdQ data structure with the state once the enqueue |
| 1723 | * has complete. Then, it doesn't access the global structure anymore, but |
| 1724 | * uses the corresponding fields on the stack. In conjuction with a spinlock |
| 1725 | * around that code, we can make the function reentrant without holding the |
| 1726 | * lock when we actually enqueue (which might be expensive, especially on |
| 1727 | * architectures with IO MMUs). |
| 1728 | * |
| 1729 | * This runs with softirqs disabled. |
| 1730 | */ |
Stephen Hemminger | aa84505 | 2005-12-14 14:38:44 -0800 | [diff] [blame] | 1731 | static int t1_sge_tx(struct sk_buff *skb, struct adapter *adapter, |
| 1732 | unsigned int qid, struct net_device *dev) |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1733 | { |
| 1734 | struct sge *sge = adapter->sge; |
| 1735 | struct cmdQ *q = &sge->cmdQ[qid]; |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1736 | unsigned int credits, pidx, genbit, count, use_sched_skb = 0; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1737 | |
Stephen Hemminger | cabdfb3 | 2006-12-01 16:36:22 -0800 | [diff] [blame] | 1738 | if (!spin_trylock(&q->lock)) |
| 1739 | return NETDEV_TX_LOCKED; |
| 1740 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1741 | reclaim_completed_tx(sge, q); |
| 1742 | |
| 1743 | pidx = q->pidx; |
| 1744 | credits = q->size - q->in_use; |
| 1745 | count = 1 + skb_shinfo(skb)->nr_frags; |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1746 | count += compute_large_page_tx_descs(skb); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1747 | |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1748 | /* Ethernet packet */ |
| 1749 | if (unlikely(credits < count)) { |
| 1750 | if (!netif_queue_stopped(dev)) { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1751 | netif_stop_queue(dev); |
| 1752 | set_bit(dev->if_port, &sge->stopped_tx_queues); |
Scott Bardone | 232a347 | 2006-03-16 19:20:40 -0500 | [diff] [blame] | 1753 | sge->stats.cmdQ_full[2]++; |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1754 | CH_ERR("%s: Tx ring full while queue awake!\n", |
| 1755 | adapter->name); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1756 | } |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1757 | spin_unlock(&q->lock); |
| 1758 | return NETDEV_TX_BUSY; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1759 | } |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1760 | |
| 1761 | if (unlikely(credits - count < q->stop_thres)) { |
| 1762 | netif_stop_queue(dev); |
| 1763 | set_bit(dev->if_port, &sge->stopped_tx_queues); |
| 1764 | sge->stats.cmdQ_full[2]++; |
| 1765 | } |
| 1766 | |
| 1767 | /* T204 cmdQ0 skbs that are destined for a certain port have to go |
| 1768 | * through the scheduler. |
| 1769 | */ |
| 1770 | if (sge->tx_sched && !qid && skb->dev) { |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 1771 | use_sched: |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1772 | use_sched_skb = 1; |
| 1773 | /* Note that the scheduler might return a different skb than |
| 1774 | * the one passed in. |
| 1775 | */ |
| 1776 | skb = sched_skb(sge, skb, credits); |
| 1777 | if (!skb) { |
| 1778 | spin_unlock(&q->lock); |
| 1779 | return NETDEV_TX_OK; |
| 1780 | } |
| 1781 | pidx = q->pidx; |
| 1782 | count = 1 + skb_shinfo(skb)->nr_frags; |
| 1783 | count += compute_large_page_tx_descs(skb); |
| 1784 | } |
| 1785 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1786 | q->in_use += count; |
| 1787 | genbit = q->genbit; |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1788 | pidx = q->pidx; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1789 | q->pidx += count; |
| 1790 | if (q->pidx >= q->size) { |
| 1791 | q->pidx -= q->size; |
| 1792 | q->genbit ^= 1; |
| 1793 | } |
| 1794 | spin_unlock(&q->lock); |
| 1795 | |
| 1796 | write_tx_descs(adapter, skb, pidx, genbit, q); |
| 1797 | |
| 1798 | /* |
| 1799 | * We always ring the doorbell for cmdQ1. For cmdQ0, we only ring |
| 1800 | * the doorbell if the Q is asleep. There is a natural race, where |
| 1801 | * the hardware is going to sleep just after we checked, however, |
| 1802 | * then the interrupt handler will detect the outstanding TX packet |
| 1803 | * and ring the doorbell for us. |
| 1804 | */ |
| 1805 | if (qid) |
| 1806 | doorbell_pio(adapter, F_CMDQ1_ENABLE); |
| 1807 | else { |
| 1808 | clear_bit(CMDQ_STAT_LAST_PKT_DB, &q->status); |
| 1809 | if (test_and_set_bit(CMDQ_STAT_RUNNING, &q->status) == 0) { |
| 1810 | set_bit(CMDQ_STAT_LAST_PKT_DB, &q->status); |
| 1811 | writel(F_CMDQ0_ENABLE, adapter->regs + A_SG_DOORBELL); |
| 1812 | } |
| 1813 | } |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1814 | |
| 1815 | if (use_sched_skb) { |
| 1816 | if (spin_trylock(&q->lock)) { |
| 1817 | credits = q->size - q->in_use; |
| 1818 | skb = NULL; |
| 1819 | goto use_sched; |
| 1820 | } |
| 1821 | } |
Stephen Hemminger | aa84505 | 2005-12-14 14:38:44 -0800 | [diff] [blame] | 1822 | return NETDEV_TX_OK; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1823 | } |
| 1824 | |
| 1825 | #define MK_ETH_TYPE_MSS(type, mss) (((mss) & 0x3FFF) | ((type) << 14)) |
| 1826 | |
| 1827 | /* |
| 1828 | * eth_hdr_len - return the length of an Ethernet header |
| 1829 | * @data: pointer to the start of the Ethernet header |
| 1830 | * |
| 1831 | * Returns the length of an Ethernet header, including optional VLAN tag. |
| 1832 | */ |
| 1833 | static inline int eth_hdr_len(const void *data) |
| 1834 | { |
| 1835 | const struct ethhdr *e = data; |
| 1836 | |
| 1837 | return e->h_proto == htons(ETH_P_8021Q) ? VLAN_ETH_HLEN : ETH_HLEN; |
| 1838 | } |
| 1839 | |
| 1840 | /* |
| 1841 | * Adds the CPL header to the sk_buff and passes it to t1_sge_tx. |
| 1842 | */ |
| 1843 | int t1_start_xmit(struct sk_buff *skb, struct net_device *dev) |
| 1844 | { |
| 1845 | struct adapter *adapter = dev->priv; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1846 | struct sge *sge = adapter->sge; |
Divy Le Ray | 7832ee0 | 2007-11-27 13:30:09 -0800 | [diff] [blame] | 1847 | struct sge_port_stats *st = per_cpu_ptr(sge->port_stats[dev->if_port], |
| 1848 | smp_processor_id()); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1849 | struct cpl_tx_pkt *cpl; |
Stephen Hemminger | cabdfb3 | 2006-12-01 16:36:22 -0800 | [diff] [blame] | 1850 | struct sk_buff *orig_skb = skb; |
| 1851 | int ret; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1852 | |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1853 | if (skb->protocol == htons(ETH_P_CPL5)) |
| 1854 | goto send; |
| 1855 | |
Divy Le Ray | 7832ee0 | 2007-11-27 13:30:09 -0800 | [diff] [blame] | 1856 | /* |
| 1857 | * We are using a non-standard hard_header_len. |
| 1858 | * Allocate more header room in the rare cases it is not big enough. |
| 1859 | */ |
| 1860 | if (unlikely(skb_headroom(skb) < dev->hard_header_len - ETH_HLEN)) { |
| 1861 | skb = skb_realloc_headroom(skb, sizeof(struct cpl_tx_pkt_lso)); |
| 1862 | ++st->tx_need_hdrroom; |
| 1863 | dev_kfree_skb_any(orig_skb); |
| 1864 | if (!skb) |
| 1865 | return NETDEV_TX_OK; |
| 1866 | } |
| 1867 | |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1868 | if (skb_shinfo(skb)->gso_size) { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1869 | int eth_type; |
| 1870 | struct cpl_tx_pkt_lso *hdr; |
| 1871 | |
Stephen Hemminger | 56f643c | 2006-12-01 16:36:21 -0800 | [diff] [blame] | 1872 | ++st->tx_tso; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1873 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 1874 | eth_type = skb_network_offset(skb) == ETH_HLEN ? |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1875 | CPL_ETH_II : CPL_ETH_II_VLAN; |
| 1876 | |
| 1877 | hdr = (struct cpl_tx_pkt_lso *)skb_push(skb, sizeof(*hdr)); |
| 1878 | hdr->opcode = CPL_TX_PKT_LSO; |
| 1879 | hdr->ip_csum_dis = hdr->l4_csum_dis = 0; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1880 | hdr->ip_hdr_words = ip_hdr(skb)->ihl; |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1881 | hdr->tcp_hdr_words = tcp_hdr(skb)->doff; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1882 | hdr->eth_type_mss = htons(MK_ETH_TYPE_MSS(eth_type, |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1883 | skb_shinfo(skb)->gso_size)); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1884 | hdr->len = htonl(skb->len - sizeof(*hdr)); |
| 1885 | cpl = (struct cpl_tx_pkt *)hdr; |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1886 | } else { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1887 | /* |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 1888 | * Packets shorter than ETH_HLEN can break the MAC, drop them |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1889 | * early. Also, we may get oversized packets because some |
| 1890 | * parts of the kernel don't handle our unusual hard_header_len |
| 1891 | * right, drop those too. |
| 1892 | */ |
| 1893 | if (unlikely(skb->len < ETH_HLEN || |
| 1894 | skb->len > dev->mtu + eth_hdr_len(skb->data))) { |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1895 | pr_debug("%s: packet size %d hdr %d mtu%d\n", dev->name, |
| 1896 | skb->len, eth_hdr_len(skb->data), dev->mtu); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1897 | dev_kfree_skb_any(skb); |
Stephen Hemminger | aa84505 | 2005-12-14 14:38:44 -0800 | [diff] [blame] | 1898 | return NETDEV_TX_OK; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1899 | } |
| 1900 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1901 | if (!(adapter->flags & UDP_CSUM_CAPABLE) && |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1902 | skb->ip_summed == CHECKSUM_PARTIAL && |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 1903 | ip_hdr(skb)->protocol == IPPROTO_UDP) { |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1904 | if (unlikely(skb_checksum_help(skb))) { |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1905 | pr_debug("%s: unable to do udp checksum\n", dev->name); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1906 | dev_kfree_skb_any(skb); |
Stephen Hemminger | aa84505 | 2005-12-14 14:38:44 -0800 | [diff] [blame] | 1907 | return NETDEV_TX_OK; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1908 | } |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1909 | } |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1910 | |
| 1911 | /* Hmmm, assuming to catch the gratious arp... and we'll use |
| 1912 | * it to flush out stuck espi packets... |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1913 | */ |
| 1914 | if ((unlikely(!adapter->sge->espibug_skb[dev->if_port]))) { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1915 | if (skb->protocol == htons(ETH_P_ARP) && |
Arnaldo Carvalho de Melo | d0a92be | 2007-03-12 20:56:31 -0300 | [diff] [blame] | 1916 | arp_hdr(skb)->ar_op == htons(ARPOP_REQUEST)) { |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1917 | adapter->sge->espibug_skb[dev->if_port] = skb; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1918 | /* We want to re-use this skb later. We |
| 1919 | * simply bump the reference count and it |
| 1920 | * will not be freed... |
| 1921 | */ |
| 1922 | skb = skb_get(skb); |
| 1923 | } |
| 1924 | } |
| 1925 | |
| 1926 | cpl = (struct cpl_tx_pkt *)__skb_push(skb, sizeof(*cpl)); |
| 1927 | cpl->opcode = CPL_TX_PKT; |
| 1928 | cpl->ip_csum_dis = 1; /* SW calculates IP csum */ |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1929 | cpl->l4_csum_dis = skb->ip_summed == CHECKSUM_PARTIAL ? 0 : 1; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1930 | /* the length field isn't used so don't bother setting it */ |
| 1931 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1932 | st->tx_cso += (skb->ip_summed == CHECKSUM_PARTIAL); |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1933 | } |
| 1934 | cpl->iff = dev->if_port; |
| 1935 | |
| 1936 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) |
| 1937 | if (adapter->vlan_grp && vlan_tx_tag_present(skb)) { |
| 1938 | cpl->vlan_valid = 1; |
| 1939 | cpl->vlan = htons(vlan_tx_tag_get(skb)); |
| 1940 | st->vlan_insert++; |
| 1941 | } else |
| 1942 | #endif |
| 1943 | cpl->vlan_valid = 0; |
| 1944 | |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1945 | send: |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1946 | dev->trans_start = jiffies; |
Stephen Hemminger | cabdfb3 | 2006-12-01 16:36:22 -0800 | [diff] [blame] | 1947 | ret = t1_sge_tx(skb, adapter, 0, dev); |
| 1948 | |
| 1949 | /* If transmit busy, and we reallocated skb's due to headroom limit, |
| 1950 | * then silently discard to avoid leak. |
| 1951 | */ |
| 1952 | if (unlikely(ret != NETDEV_TX_OK && skb != orig_skb)) { |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 1953 | dev_kfree_skb_any(skb); |
Stephen Hemminger | cabdfb3 | 2006-12-01 16:36:22 -0800 | [diff] [blame] | 1954 | ret = NETDEV_TX_OK; |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 1955 | } |
Stephen Hemminger | cabdfb3 | 2006-12-01 16:36:22 -0800 | [diff] [blame] | 1956 | return ret; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1957 | } |
| 1958 | |
| 1959 | /* |
| 1960 | * Callback for the Tx buffer reclaim timer. Runs with softirqs disabled. |
| 1961 | */ |
| 1962 | static void sge_tx_reclaim_cb(unsigned long data) |
| 1963 | { |
| 1964 | int i; |
| 1965 | struct sge *sge = (struct sge *)data; |
| 1966 | |
| 1967 | for (i = 0; i < SGE_CMDQ_N; ++i) { |
| 1968 | struct cmdQ *q = &sge->cmdQ[i]; |
| 1969 | |
| 1970 | if (!spin_trylock(&q->lock)) |
| 1971 | continue; |
| 1972 | |
| 1973 | reclaim_completed_tx(sge, q); |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 1974 | if (i == 0 && q->in_use) { /* flush pending credits */ |
| 1975 | writel(F_CMDQ0_ENABLE, sge->adapter->regs + A_SG_DOORBELL); |
| 1976 | } |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1977 | spin_unlock(&q->lock); |
| 1978 | } |
| 1979 | mod_timer(&sge->tx_reclaim_timer, jiffies + TX_RECLAIM_PERIOD); |
| 1980 | } |
| 1981 | |
| 1982 | /* |
| 1983 | * Propagate changes of the SGE coalescing parameters to the HW. |
| 1984 | */ |
| 1985 | int t1_sge_set_coalesce_params(struct sge *sge, struct sge_params *p) |
| 1986 | { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 1987 | sge->fixed_intrtimer = p->rx_coalesce_usecs * |
| 1988 | core_ticks_per_usec(sge->adapter); |
| 1989 | writel(sge->fixed_intrtimer, sge->adapter->regs + A_SG_INTRTIMER); |
| 1990 | return 0; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 1991 | } |
| 1992 | |
| 1993 | /* |
| 1994 | * Allocates both RX and TX resources and configures the SGE. However, |
| 1995 | * the hardware is not enabled yet. |
| 1996 | */ |
| 1997 | int t1_sge_configure(struct sge *sge, struct sge_params *p) |
| 1998 | { |
| 1999 | if (alloc_rx_resources(sge, p)) |
| 2000 | return -ENOMEM; |
| 2001 | if (alloc_tx_resources(sge, p)) { |
| 2002 | free_rx_resources(sge); |
| 2003 | return -ENOMEM; |
| 2004 | } |
| 2005 | configure_sge(sge, p); |
| 2006 | |
| 2007 | /* |
| 2008 | * Now that we have sized the free lists calculate the payload |
| 2009 | * capacity of the large buffers. Other parts of the driver use |
| 2010 | * this to set the max offload coalescing size so that RX packets |
| 2011 | * do not overflow our large buffers. |
| 2012 | */ |
| 2013 | p->large_buf_capacity = jumbo_payload_capacity(sge); |
| 2014 | return 0; |
| 2015 | } |
| 2016 | |
| 2017 | /* |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2018 | * Disables the DMA engine. |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2019 | */ |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2020 | void t1_sge_stop(struct sge *sge) |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2021 | { |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 2022 | int i; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2023 | writel(0, sge->adapter->regs + A_SG_CONTROL); |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 2024 | readl(sge->adapter->regs + A_SG_CONTROL); /* flush */ |
| 2025 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2026 | if (is_T2(sge->adapter)) |
| 2027 | del_timer_sync(&sge->espibug_timer); |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 2028 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2029 | del_timer_sync(&sge->tx_reclaim_timer); |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 2030 | if (sge->tx_sched) |
| 2031 | tx_sched_stop(sge); |
| 2032 | |
| 2033 | for (i = 0; i < MAX_NPORTS; i++) |
| 2034 | if (sge->espibug_skb[i]) |
| 2035 | kfree_skb(sge->espibug_skb[i]); |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2036 | } |
| 2037 | |
| 2038 | /* |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2039 | * Enables the DMA engine. |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2040 | */ |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2041 | void t1_sge_start(struct sge *sge) |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2042 | { |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2043 | refill_free_list(sge, &sge->freelQ[0]); |
| 2044 | refill_free_list(sge, &sge->freelQ[1]); |
| 2045 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2046 | writel(sge->sge_control, sge->adapter->regs + A_SG_CONTROL); |
| 2047 | doorbell_pio(sge->adapter, F_FL0_ENABLE | F_FL1_ENABLE); |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 2048 | readl(sge->adapter->regs + A_SG_CONTROL); /* flush */ |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2049 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2050 | mod_timer(&sge->tx_reclaim_timer, jiffies + TX_RECLAIM_PERIOD); |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2051 | |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 2052 | if (is_T2(sge->adapter)) |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2053 | mod_timer(&sge->espibug_timer, jiffies + sge->espibug_timeout); |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2054 | } |
| 2055 | |
| 2056 | /* |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2057 | * Callback for the T2 ESPI 'stuck packet feature' workaorund |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2058 | */ |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 2059 | static void espibug_workaround_t204(unsigned long data) |
| 2060 | { |
| 2061 | struct adapter *adapter = (struct adapter *)data; |
| 2062 | struct sge *sge = adapter->sge; |
| 2063 | unsigned int nports = adapter->params.nports; |
| 2064 | u32 seop[MAX_NPORTS]; |
| 2065 | |
| 2066 | if (adapter->open_device_map & PORT_MASK) { |
| 2067 | int i; |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 2068 | |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 2069 | if (t1_espi_get_mon_t204(adapter, &(seop[0]), 0) < 0) |
| 2070 | return; |
| 2071 | |
| 2072 | for (i = 0; i < nports; i++) { |
| 2073 | struct sk_buff *skb = sge->espibug_skb[i]; |
| 2074 | |
| 2075 | if (!netif_running(adapter->port[i].dev) || |
| 2076 | netif_queue_stopped(adapter->port[i].dev) || |
| 2077 | !seop[i] || ((seop[i] & 0xfff) != 0) || !skb) |
| 2078 | continue; |
| 2079 | |
| 2080 | if (!skb->cb[0]) { |
| 2081 | u8 ch_mac_addr[ETH_ALEN] = { |
| 2082 | 0x0, 0x7, 0x43, 0x0, 0x0, 0x0 |
| 2083 | }; |
| 2084 | |
Arnaldo Carvalho de Melo | 27d7ff4 | 2007-03-31 11:55:19 -0300 | [diff] [blame] | 2085 | skb_copy_to_linear_data_offset(skb, |
| 2086 | sizeof(struct cpl_tx_pkt), |
| 2087 | ch_mac_addr, |
| 2088 | ETH_ALEN); |
| 2089 | skb_copy_to_linear_data_offset(skb, |
| 2090 | skb->len - 10, |
| 2091 | ch_mac_addr, |
| 2092 | ETH_ALEN); |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 2093 | skb->cb[0] = 0xff; |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 2094 | } |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 2095 | |
| 2096 | /* bump the reference count to avoid freeing of |
| 2097 | * the skb once the DMA has completed. |
| 2098 | */ |
| 2099 | skb = skb_get(skb); |
| 2100 | t1_sge_tx(skb, adapter, 0, adapter->port[i].dev); |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 2101 | } |
| 2102 | } |
| 2103 | mod_timer(&sge->espibug_timer, jiffies + sge->espibug_timeout); |
| 2104 | } |
| 2105 | |
| 2106 | static void espibug_workaround(unsigned long data) |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2107 | { |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2108 | struct adapter *adapter = (struct adapter *)data; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2109 | struct sge *sge = adapter->sge; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2110 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2111 | if (netif_running(adapter->port[0].dev)) { |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 2112 | struct sk_buff *skb = sge->espibug_skb[0]; |
| 2113 | u32 seop = t1_espi_get_mon(adapter, 0x930, 0); |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2114 | |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 2115 | if ((seop & 0xfff0fff) == 0xfff && skb) { |
| 2116 | if (!skb->cb[0]) { |
| 2117 | u8 ch_mac_addr[ETH_ALEN] = |
| 2118 | {0x0, 0x7, 0x43, 0x0, 0x0, 0x0}; |
Arnaldo Carvalho de Melo | 27d7ff4 | 2007-03-31 11:55:19 -0300 | [diff] [blame] | 2119 | skb_copy_to_linear_data_offset(skb, |
| 2120 | sizeof(struct cpl_tx_pkt), |
| 2121 | ch_mac_addr, |
| 2122 | ETH_ALEN); |
| 2123 | skb_copy_to_linear_data_offset(skb, |
| 2124 | skb->len - 10, |
| 2125 | ch_mac_addr, |
| 2126 | ETH_ALEN); |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 2127 | skb->cb[0] = 0xff; |
| 2128 | } |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2129 | |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 2130 | /* bump the reference count to avoid freeing of the |
| 2131 | * skb once the DMA has completed. |
| 2132 | */ |
| 2133 | skb = skb_get(skb); |
| 2134 | t1_sge_tx(skb, adapter, 0, adapter->port[0].dev); |
| 2135 | } |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2136 | } |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2137 | mod_timer(&sge->espibug_timer, jiffies + sge->espibug_timeout); |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2138 | } |
| 2139 | |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2140 | /* |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2141 | * Creates a t1_sge structure and returns suggested resource parameters. |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2142 | */ |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2143 | struct sge * __devinit t1_sge_create(struct adapter *adapter, |
| 2144 | struct sge_params *p) |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2145 | { |
Stephen Hemminger | cbee9f9 | 2006-11-17 17:01:52 -0800 | [diff] [blame] | 2146 | struct sge *sge = kzalloc(sizeof(*sge), GFP_KERNEL); |
Stephen Hemminger | 56f643c | 2006-12-01 16:36:21 -0800 | [diff] [blame] | 2147 | int i; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2148 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2149 | if (!sge) |
| 2150 | return NULL; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2151 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2152 | sge->adapter = adapter; |
| 2153 | sge->netdev = adapter->port[0].dev; |
| 2154 | sge->rx_pkt_pad = t1_is_T1B(adapter) ? 0 : 2; |
| 2155 | sge->jumbo_fl = t1_is_T1B(adapter) ? 1 : 0; |
| 2156 | |
Stephen Hemminger | 56f643c | 2006-12-01 16:36:21 -0800 | [diff] [blame] | 2157 | for_each_port(adapter, i) { |
| 2158 | sge->port_stats[i] = alloc_percpu(struct sge_port_stats); |
| 2159 | if (!sge->port_stats[i]) |
| 2160 | goto nomem_port; |
| 2161 | } |
| 2162 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2163 | init_timer(&sge->tx_reclaim_timer); |
| 2164 | sge->tx_reclaim_timer.data = (unsigned long)sge; |
| 2165 | sge->tx_reclaim_timer.function = sge_tx_reclaim_cb; |
| 2166 | |
| 2167 | if (is_T2(sge->adapter)) { |
| 2168 | init_timer(&sge->espibug_timer); |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 2169 | |
| 2170 | if (adapter->params.nports > 1) { |
| 2171 | tx_sched_init(sge); |
| 2172 | sge->espibug_timer.function = espibug_workaround_t204; |
Francois Romieu | d748742 | 2006-12-11 23:49:13 +0100 | [diff] [blame] | 2173 | } else |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 2174 | sge->espibug_timer.function = espibug_workaround; |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2175 | sge->espibug_timer.data = (unsigned long)sge->adapter; |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 2176 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2177 | sge->espibug_timeout = 1; |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 2178 | /* for T204, every 10ms */ |
| 2179 | if (adapter->params.nports > 1) |
| 2180 | sge->espibug_timeout = HZ/100; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2181 | } |
Francois Romieu | 356bd14 | 2006-12-11 23:47:00 +0100 | [diff] [blame] | 2182 | |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2183 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2184 | p->cmdQ_size[0] = SGE_CMDQ0_E_N; |
| 2185 | p->cmdQ_size[1] = SGE_CMDQ1_E_N; |
| 2186 | p->freelQ_size[!sge->jumbo_fl] = SGE_FREEL_SIZE; |
| 2187 | p->freelQ_size[sge->jumbo_fl] = SGE_JUMBO_FREEL_SIZE; |
Stephen Hemminger | f1d3d38 | 2006-12-01 16:36:16 -0800 | [diff] [blame] | 2188 | if (sge->tx_sched) { |
| 2189 | if (board_info(sge->adapter)->board == CHBT_BOARD_CHT204) |
| 2190 | p->rx_coalesce_usecs = 15; |
| 2191 | else |
| 2192 | p->rx_coalesce_usecs = 50; |
| 2193 | } else |
| 2194 | p->rx_coalesce_usecs = 50; |
| 2195 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2196 | p->coalesce_enable = 0; |
| 2197 | p->sample_interval_usecs = 0; |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2198 | |
Scott Bardone | 559fb51 | 2005-06-23 01:40:19 -0400 | [diff] [blame] | 2199 | return sge; |
Stephen Hemminger | 56f643c | 2006-12-01 16:36:21 -0800 | [diff] [blame] | 2200 | nomem_port: |
| 2201 | while (i >= 0) { |
| 2202 | free_percpu(sge->port_stats[i]); |
| 2203 | --i; |
| 2204 | } |
| 2205 | kfree(sge); |
| 2206 | return NULL; |
| 2207 | |
Christoph Lameter | 8199d3a | 2005-03-30 13:34:31 -0800 | [diff] [blame] | 2208 | } |