David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 1 | /********************************************************************* |
| 2 | * Author: Cavium Networks |
| 3 | * |
| 4 | * Contact: support@caviumnetworks.com |
| 5 | * This file is part of the OCTEON SDK |
| 6 | * |
David Daney | 166bdaa | 2010-01-27 13:22:53 -0800 | [diff] [blame] | 7 | * Copyright (c) 2003-2010 Cavium Networks |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 8 | * |
| 9 | * This file is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License, Version 2, as |
| 11 | * published by the Free Software Foundation. |
| 12 | * |
| 13 | * This file is distributed in the hope that it will be useful, but |
| 14 | * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty |
| 15 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or |
| 16 | * NONINFRINGEMENT. See the GNU General Public License for more |
| 17 | * details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this file; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 22 | * or visit http://www.gnu.org/licenses/. |
| 23 | * |
| 24 | * This file may also be available under a different license from Cavium. |
| 25 | * Contact Cavium Networks for more information |
| 26 | *********************************************************************/ |
| 27 | #include <linux/module.h> |
| 28 | #include <linux/kernel.h> |
| 29 | #include <linux/netdevice.h> |
| 30 | #include <linux/init.h> |
| 31 | #include <linux/etherdevice.h> |
| 32 | #include <linux/ip.h> |
Christian Dietrich | 7a2eaf9 | 2011-06-04 17:35:58 +0200 | [diff] [blame] | 33 | #include <linux/ratelimit.h> |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 34 | #include <linux/string.h> |
Imre Kaloz | dc890df | 2012-04-19 12:27:27 +0200 | [diff] [blame] | 35 | #include <linux/interrupt.h> |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 36 | #include <net/dst.h> |
| 37 | #ifdef CONFIG_XFRM |
| 38 | #include <linux/xfrm.h> |
| 39 | #include <net/xfrm.h> |
| 40 | #endif /* CONFIG_XFRM */ |
| 41 | |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 42 | #include <linux/atomic.h> |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 43 | |
| 44 | #include <asm/octeon/octeon.h> |
| 45 | |
| 46 | #include "ethernet-defines.h" |
| 47 | #include "octeon-ethernet.h" |
David Daney | a620c16 | 2009-06-23 16:20:56 -0700 | [diff] [blame] | 48 | #include "ethernet-tx.h" |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 49 | #include "ethernet-util.h" |
| 50 | |
David Daney | af86649 | 2011-11-22 14:47:00 +0000 | [diff] [blame] | 51 | #include <asm/octeon/cvmx-wqe.h> |
| 52 | #include <asm/octeon/cvmx-fau.h> |
| 53 | #include <asm/octeon/cvmx-pip.h> |
| 54 | #include <asm/octeon/cvmx-pko.h> |
| 55 | #include <asm/octeon/cvmx-helper.h> |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 56 | |
David Daney | af86649 | 2011-11-22 14:47:00 +0000 | [diff] [blame] | 57 | #include <asm/octeon/cvmx-gmxx-defs.h> |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 58 | |
David Daney | 924cc26 | 2010-01-07 11:05:05 -0800 | [diff] [blame] | 59 | #define CVM_OCT_SKB_CB(skb) ((u64 *)((skb)->cb)) |
| 60 | |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 61 | /* |
| 62 | * You can define GET_SKBUFF_QOS() to override how the skbuff output |
| 63 | * function determines which output queue is used. The default |
| 64 | * implementation always uses the base queue for the port. If, for |
| 65 | * example, you wanted to use the skb->priority fieid, define |
| 66 | * GET_SKBUFF_QOS as: #define GET_SKBUFF_QOS(skb) ((skb)->priority) |
| 67 | */ |
| 68 | #ifndef GET_SKBUFF_QOS |
| 69 | #define GET_SKBUFF_QOS(skb) 0 |
| 70 | #endif |
| 71 | |
David Daney | 4898c56 | 2010-02-15 15:06:47 -0800 | [diff] [blame] | 72 | static void cvm_oct_tx_do_cleanup(unsigned long arg); |
| 73 | static DECLARE_TASKLET(cvm_oct_tx_cleanup_tasklet, cvm_oct_tx_do_cleanup, 0); |
| 74 | |
| 75 | /* Maximum number of SKBs to try to free per xmit packet. */ |
| 76 | #define MAX_SKB_TO_FREE (MAX_OUT_QUEUE_DEPTH * 2) |
David Daney | 6888fc8 | 2010-01-07 11:05:03 -0800 | [diff] [blame] | 77 | |
| 78 | static inline int32_t cvm_oct_adjust_skb_to_free(int32_t skb_to_free, int fau) |
| 79 | { |
| 80 | int32_t undo; |
| 81 | undo = skb_to_free > 0 ? MAX_SKB_TO_FREE : skb_to_free + MAX_SKB_TO_FREE; |
| 82 | if (undo > 0) |
| 83 | cvmx_fau_atomic_add32(fau, -undo); |
| 84 | skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ? MAX_SKB_TO_FREE : -skb_to_free; |
| 85 | return skb_to_free; |
| 86 | } |
| 87 | |
David Daney | 4898c56 | 2010-02-15 15:06:47 -0800 | [diff] [blame] | 88 | static void cvm_oct_kick_tx_poll_watchdog(void) |
| 89 | { |
| 90 | union cvmx_ciu_timx ciu_timx; |
| 91 | ciu_timx.u64 = 0; |
| 92 | ciu_timx.s.one_shot = 1; |
| 93 | ciu_timx.s.len = cvm_oct_tx_poll_interval; |
| 94 | cvmx_write_csr(CVMX_CIU_TIMX(1), ciu_timx.u64); |
| 95 | } |
| 96 | |
| 97 | void cvm_oct_free_tx_skbs(struct net_device *dev) |
David Daney | 6888fc8 | 2010-01-07 11:05:03 -0800 | [diff] [blame] | 98 | { |
| 99 | int32_t skb_to_free; |
| 100 | int qos, queues_per_port; |
David Daney | 4898c56 | 2010-02-15 15:06:47 -0800 | [diff] [blame] | 101 | int total_freed = 0; |
| 102 | int total_remaining = 0; |
| 103 | unsigned long flags; |
| 104 | struct octeon_ethernet *priv = netdev_priv(dev); |
| 105 | |
David Daney | 6888fc8 | 2010-01-07 11:05:03 -0800 | [diff] [blame] | 106 | queues_per_port = cvmx_pko_get_num_queues(priv->port); |
| 107 | /* Drain any pending packets in the free list */ |
| 108 | for (qos = 0; qos < queues_per_port; qos++) { |
| 109 | if (skb_queue_len(&priv->tx_free_list[qos]) == 0) |
| 110 | continue; |
| 111 | skb_to_free = cvmx_fau_fetch_and_add32(priv->fau+qos*4, MAX_SKB_TO_FREE); |
| 112 | skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau+qos*4); |
| 113 | |
David Daney | 4898c56 | 2010-02-15 15:06:47 -0800 | [diff] [blame] | 114 | |
| 115 | total_freed += skb_to_free; |
| 116 | if (skb_to_free > 0) { |
| 117 | struct sk_buff *to_free_list = NULL; |
| 118 | spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags); |
| 119 | while (skb_to_free > 0) { |
| 120 | struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]); |
| 121 | t->next = to_free_list; |
| 122 | to_free_list = t; |
| 123 | skb_to_free--; |
| 124 | } |
| 125 | spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags); |
| 126 | /* Do the actual freeing outside of the lock. */ |
| 127 | while (to_free_list) { |
| 128 | struct sk_buff *t = to_free_list; |
| 129 | to_free_list = to_free_list->next; |
| 130 | dev_kfree_skb_any(t); |
| 131 | } |
David Daney | 6888fc8 | 2010-01-07 11:05:03 -0800 | [diff] [blame] | 132 | } |
David Daney | 4898c56 | 2010-02-15 15:06:47 -0800 | [diff] [blame] | 133 | total_remaining += skb_queue_len(&priv->tx_free_list[qos]); |
David Daney | 6888fc8 | 2010-01-07 11:05:03 -0800 | [diff] [blame] | 134 | } |
David Daney | 4898c56 | 2010-02-15 15:06:47 -0800 | [diff] [blame] | 135 | if (total_freed >= 0 && netif_queue_stopped(dev)) |
David Daney | 6888fc8 | 2010-01-07 11:05:03 -0800 | [diff] [blame] | 136 | netif_wake_queue(dev); |
David Daney | 4898c56 | 2010-02-15 15:06:47 -0800 | [diff] [blame] | 137 | if (total_remaining) |
| 138 | cvm_oct_kick_tx_poll_watchdog(); |
David Daney | 6888fc8 | 2010-01-07 11:05:03 -0800 | [diff] [blame] | 139 | } |
| 140 | |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 141 | /** |
David Daney | ec977c5 | 2010-02-16 17:25:32 -0800 | [diff] [blame] | 142 | * cvm_oct_xmit - transmit a packet |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 143 | * @skb: Packet to send |
| 144 | * @dev: Device info structure |
David Daney | ec977c5 | 2010-02-16 17:25:32 -0800 | [diff] [blame] | 145 | * |
| 146 | * Returns Always returns NETDEV_TX_OK |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 147 | */ |
| 148 | int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev) |
| 149 | { |
| 150 | cvmx_pko_command_word0_t pko_command; |
| 151 | union cvmx_buf_ptr hw_buffer; |
| 152 | uint64_t old_scratch; |
| 153 | uint64_t old_scratch2; |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 154 | int qos; |
David Daney | 924cc26 | 2010-01-07 11:05:05 -0800 | [diff] [blame] | 155 | int i; |
David Daney | 6888fc8 | 2010-01-07 11:05:03 -0800 | [diff] [blame] | 156 | enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type; |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 157 | struct octeon_ethernet *priv = netdev_priv(dev); |
David Daney | 6888fc8 | 2010-01-07 11:05:03 -0800 | [diff] [blame] | 158 | struct sk_buff *to_free_list; |
David Daney | a620c16 | 2009-06-23 16:20:56 -0700 | [diff] [blame] | 159 | int32_t skb_to_free; |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 160 | int32_t buffers_to_free; |
David Daney | 4898c56 | 2010-02-15 15:06:47 -0800 | [diff] [blame] | 161 | u32 total_to_clean; |
David Daney | 6888fc8 | 2010-01-07 11:05:03 -0800 | [diff] [blame] | 162 | unsigned long flags; |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 163 | #if REUSE_SKBUFFS_WITHOUT_FREE |
| 164 | unsigned char *fpa_head; |
| 165 | #endif |
| 166 | |
| 167 | /* |
| 168 | * Prefetch the private data structure. It is larger that one |
| 169 | * cache line. |
| 170 | */ |
| 171 | prefetch(priv); |
| 172 | |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 173 | /* |
| 174 | * The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to |
| 175 | * completely remove "qos" in the event neither interface |
| 176 | * supports multiple queues per port. |
| 177 | */ |
| 178 | if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) || |
| 179 | (CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) { |
| 180 | qos = GET_SKBUFF_QOS(skb); |
| 181 | if (qos <= 0) |
| 182 | qos = 0; |
| 183 | else if (qos >= cvmx_pko_get_num_queues(priv->port)) |
| 184 | qos = 0; |
| 185 | } else |
| 186 | qos = 0; |
| 187 | |
| 188 | if (USE_ASYNC_IOBDMA) { |
| 189 | /* Save scratch in case userspace is using it */ |
| 190 | CVMX_SYNCIOBDMA; |
| 191 | old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH); |
| 192 | old_scratch2 = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8); |
| 193 | |
| 194 | /* |
David Daney | a620c16 | 2009-06-23 16:20:56 -0700 | [diff] [blame] | 195 | * Fetch and increment the number of packets to be |
| 196 | * freed. |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 197 | */ |
| 198 | cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH + 8, |
| 199 | FAU_NUM_PACKET_BUFFERS_TO_FREE, |
| 200 | 0); |
| 201 | cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH, |
David Daney | a620c16 | 2009-06-23 16:20:56 -0700 | [diff] [blame] | 202 | priv->fau + qos * 4, |
| 203 | MAX_SKB_TO_FREE); |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 204 | } |
| 205 | |
| 206 | /* |
David Daney | 924cc26 | 2010-01-07 11:05:05 -0800 | [diff] [blame] | 207 | * We have space for 6 segment pointers, If there will be more |
| 208 | * than that, we must linearize. |
| 209 | */ |
| 210 | if (unlikely(skb_shinfo(skb)->nr_frags > 5)) { |
| 211 | if (unlikely(__skb_linearize(skb))) { |
| 212 | queue_type = QUEUE_DROP; |
| 213 | if (USE_ASYNC_IOBDMA) { |
| 214 | /* Get the number of skbuffs in use by the hardware */ |
| 215 | CVMX_SYNCIOBDMA; |
| 216 | skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH); |
| 217 | } else { |
| 218 | /* Get the number of skbuffs in use by the hardware */ |
| 219 | skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4, |
| 220 | MAX_SKB_TO_FREE); |
| 221 | } |
| 222 | skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau + qos * 4); |
| 223 | spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags); |
| 224 | goto skip_xmit; |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | /* |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 229 | * The CN3XXX series of parts has an errata (GMX-401) which |
| 230 | * causes the GMX block to hang if a collision occurs towards |
| 231 | * the end of a <68 byte packet. As a workaround for this, we |
| 232 | * pad packets to be 68 bytes whenever we are in half duplex |
| 233 | * mode. We don't handle the case of having a small packet but |
| 234 | * no room to add the padding. The kernel should always give |
| 235 | * us at least a cache line |
| 236 | */ |
| 237 | if ((skb->len < 64) && OCTEON_IS_MODEL(OCTEON_CN3XXX)) { |
| 238 | union cvmx_gmxx_prtx_cfg gmx_prt_cfg; |
| 239 | int interface = INTERFACE(priv->port); |
| 240 | int index = INDEX(priv->port); |
| 241 | |
| 242 | if (interface < 2) { |
| 243 | /* We only need to pad packet in half duplex mode */ |
| 244 | gmx_prt_cfg.u64 = |
| 245 | cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface)); |
| 246 | if (gmx_prt_cfg.s.duplex == 0) { |
| 247 | int add_bytes = 64 - skb->len; |
| 248 | if ((skb_tail_pointer(skb) + add_bytes) <= |
| 249 | skb_end_pointer(skb)) |
| 250 | memset(__skb_put(skb, add_bytes), 0, |
| 251 | add_bytes); |
| 252 | } |
| 253 | } |
| 254 | } |
| 255 | |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 256 | /* Build the PKO command */ |
| 257 | pko_command.u64 = 0; |
| 258 | pko_command.s.n2 = 1; /* Don't pollute L2 with the outgoing packet */ |
| 259 | pko_command.s.segs = 1; |
| 260 | pko_command.s.total_bytes = skb->len; |
| 261 | pko_command.s.size0 = CVMX_FAU_OP_SIZE_32; |
| 262 | pko_command.s.subone0 = 1; |
| 263 | |
| 264 | pko_command.s.dontfree = 1; |
David Daney | 924cc26 | 2010-01-07 11:05:05 -0800 | [diff] [blame] | 265 | |
| 266 | /* Build the PKO buffer pointer */ |
| 267 | hw_buffer.u64 = 0; |
| 268 | if (skb_shinfo(skb)->nr_frags == 0) { |
| 269 | hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data); |
| 270 | hw_buffer.s.pool = 0; |
| 271 | hw_buffer.s.size = skb->len; |
| 272 | } else { |
| 273 | hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data); |
| 274 | hw_buffer.s.pool = 0; |
| 275 | hw_buffer.s.size = skb_headlen(skb); |
| 276 | CVM_OCT_SKB_CB(skb)[0] = hw_buffer.u64; |
| 277 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
| 278 | struct skb_frag_struct *fs = skb_shinfo(skb)->frags + i; |
David Daney | 8d804d4 | 2011-11-07 12:49:30 -0800 | [diff] [blame] | 279 | hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)(page_address(fs->page.p) + fs->page_offset)); |
David Daney | 924cc26 | 2010-01-07 11:05:05 -0800 | [diff] [blame] | 280 | hw_buffer.s.size = fs->size; |
| 281 | CVM_OCT_SKB_CB(skb)[i + 1] = hw_buffer.u64; |
| 282 | } |
| 283 | hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)CVM_OCT_SKB_CB(skb)); |
| 284 | hw_buffer.s.size = skb_shinfo(skb)->nr_frags + 1; |
| 285 | pko_command.s.segs = skb_shinfo(skb)->nr_frags + 1; |
| 286 | pko_command.s.gather = 1; |
| 287 | goto dont_put_skbuff_in_hw; |
| 288 | } |
| 289 | |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 290 | /* |
| 291 | * See if we can put this skb in the FPA pool. Any strange |
| 292 | * behavior from the Linux networking stack will most likely |
| 293 | * be caused by a bug in the following code. If some field is |
| 294 | * in use by the network stack and get carried over when a |
| 295 | * buffer is reused, bad thing may happen. If in doubt and |
| 296 | * you dont need the absolute best performance, disable the |
| 297 | * define REUSE_SKBUFFS_WITHOUT_FREE. The reuse of buffers has |
| 298 | * shown a 25% increase in performance under some loads. |
| 299 | */ |
| 300 | #if REUSE_SKBUFFS_WITHOUT_FREE |
David Daney | 166bdaa | 2010-01-27 13:22:53 -0800 | [diff] [blame] | 301 | fpa_head = skb->head + 256 - ((unsigned long)skb->head & 0x7f); |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 302 | if (unlikely(skb->data < fpa_head)) { |
| 303 | /* |
| 304 | * printk("TX buffer beginning can't meet FPA |
| 305 | * alignment constraints\n"); |
| 306 | */ |
| 307 | goto dont_put_skbuff_in_hw; |
| 308 | } |
| 309 | if (unlikely |
| 310 | ((skb_end_pointer(skb) - fpa_head) < CVMX_FPA_PACKET_POOL_SIZE)) { |
| 311 | /* |
| 312 | printk("TX buffer isn't large enough for the FPA\n"); |
| 313 | */ |
| 314 | goto dont_put_skbuff_in_hw; |
| 315 | } |
| 316 | if (unlikely(skb_shared(skb))) { |
| 317 | /* |
| 318 | printk("TX buffer sharing data with someone else\n"); |
| 319 | */ |
| 320 | goto dont_put_skbuff_in_hw; |
| 321 | } |
| 322 | if (unlikely(skb_cloned(skb))) { |
| 323 | /* |
| 324 | printk("TX buffer has been cloned\n"); |
| 325 | */ |
| 326 | goto dont_put_skbuff_in_hw; |
| 327 | } |
| 328 | if (unlikely(skb_header_cloned(skb))) { |
| 329 | /* |
| 330 | printk("TX buffer header has been cloned\n"); |
| 331 | */ |
| 332 | goto dont_put_skbuff_in_hw; |
| 333 | } |
| 334 | if (unlikely(skb->destructor)) { |
| 335 | /* |
| 336 | printk("TX buffer has a destructor\n"); |
| 337 | */ |
| 338 | goto dont_put_skbuff_in_hw; |
| 339 | } |
| 340 | if (unlikely(skb_shinfo(skb)->nr_frags)) { |
| 341 | /* |
| 342 | printk("TX buffer has fragments\n"); |
| 343 | */ |
| 344 | goto dont_put_skbuff_in_hw; |
| 345 | } |
| 346 | if (unlikely |
| 347 | (skb->truesize != |
| 348 | sizeof(*skb) + skb_end_pointer(skb) - skb->head)) { |
| 349 | /* |
| 350 | printk("TX buffer truesize has been changed\n"); |
| 351 | */ |
| 352 | goto dont_put_skbuff_in_hw; |
| 353 | } |
| 354 | |
| 355 | /* |
| 356 | * We can use this buffer in the FPA. We don't need the FAU |
| 357 | * update anymore |
| 358 | */ |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 359 | pko_command.s.dontfree = 0; |
| 360 | |
David Daney | 166bdaa | 2010-01-27 13:22:53 -0800 | [diff] [blame] | 361 | hw_buffer.s.back = ((unsigned long)skb->data >> 7) - ((unsigned long)fpa_head >> 7); |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 362 | *(struct sk_buff **)(fpa_head - sizeof(void *)) = skb; |
| 363 | |
| 364 | /* |
| 365 | * The skbuff will be reused without ever being freed. We must |
David Daney | f696a10 | 2009-06-23 11:34:08 -0700 | [diff] [blame] | 366 | * cleanup a bunch of core things. |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 367 | */ |
David Daney | f696a10 | 2009-06-23 11:34:08 -0700 | [diff] [blame] | 368 | dst_release(skb_dst(skb)); |
| 369 | skb_dst_set(skb, NULL); |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 370 | #ifdef CONFIG_XFRM |
| 371 | secpath_put(skb->sp); |
| 372 | skb->sp = NULL; |
| 373 | #endif |
| 374 | nf_reset(skb); |
| 375 | |
| 376 | #ifdef CONFIG_NET_SCHED |
| 377 | skb->tc_index = 0; |
| 378 | #ifdef CONFIG_NET_CLS_ACT |
| 379 | skb->tc_verd = 0; |
| 380 | #endif /* CONFIG_NET_CLS_ACT */ |
| 381 | #endif /* CONFIG_NET_SCHED */ |
David Daney | 6888fc8 | 2010-01-07 11:05:03 -0800 | [diff] [blame] | 382 | #endif /* REUSE_SKBUFFS_WITHOUT_FREE */ |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 383 | |
| 384 | dont_put_skbuff_in_hw: |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 385 | |
| 386 | /* Check if we can use the hardware checksumming */ |
| 387 | if (USE_HW_TCPUDP_CHECKSUM && (skb->protocol == htons(ETH_P_IP)) && |
| 388 | (ip_hdr(skb)->version == 4) && (ip_hdr(skb)->ihl == 5) && |
| 389 | ((ip_hdr(skb)->frag_off == 0) || (ip_hdr(skb)->frag_off == 1 << 14)) |
David Daney | 081f674 | 2010-01-07 11:05:06 -0800 | [diff] [blame] | 390 | && ((ip_hdr(skb)->protocol == IPPROTO_TCP) |
| 391 | || (ip_hdr(skb)->protocol == IPPROTO_UDP))) { |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 392 | /* Use hardware checksum calc */ |
| 393 | pko_command.s.ipoffp1 = sizeof(struct ethhdr) + 1; |
| 394 | } |
| 395 | |
| 396 | if (USE_ASYNC_IOBDMA) { |
| 397 | /* Get the number of skbuffs in use by the hardware */ |
| 398 | CVMX_SYNCIOBDMA; |
David Daney | a620c16 | 2009-06-23 16:20:56 -0700 | [diff] [blame] | 399 | skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH); |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 400 | buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8); |
| 401 | } else { |
| 402 | /* Get the number of skbuffs in use by the hardware */ |
David Daney | a620c16 | 2009-06-23 16:20:56 -0700 | [diff] [blame] | 403 | skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4, |
| 404 | MAX_SKB_TO_FREE); |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 405 | buffers_to_free = |
| 406 | cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0); |
| 407 | } |
| 408 | |
David Daney | 6888fc8 | 2010-01-07 11:05:03 -0800 | [diff] [blame] | 409 | skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free, priv->fau+qos*4); |
David Daney | a620c16 | 2009-06-23 16:20:56 -0700 | [diff] [blame] | 410 | |
| 411 | /* |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 412 | * If we're sending faster than the receive can free them then |
| 413 | * don't do the HW free. |
| 414 | */ |
David Daney | 4898c56 | 2010-02-15 15:06:47 -0800 | [diff] [blame] | 415 | if ((buffers_to_free < -100) && !pko_command.s.dontfree) |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 416 | pko_command.s.dontfree = 1; |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 417 | |
David Daney | 4898c56 | 2010-02-15 15:06:47 -0800 | [diff] [blame] | 418 | if (pko_command.s.dontfree) { |
David Daney | 6888fc8 | 2010-01-07 11:05:03 -0800 | [diff] [blame] | 419 | queue_type = QUEUE_CORE; |
David Daney | 4898c56 | 2010-02-15 15:06:47 -0800 | [diff] [blame] | 420 | pko_command.s.reg0 = priv->fau+qos*4; |
| 421 | } else { |
David Daney | 6888fc8 | 2010-01-07 11:05:03 -0800 | [diff] [blame] | 422 | queue_type = QUEUE_HW; |
David Daney | 4898c56 | 2010-02-15 15:06:47 -0800 | [diff] [blame] | 423 | } |
| 424 | if (USE_ASYNC_IOBDMA) |
| 425 | cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH, FAU_TOTAL_TX_TO_CLEAN, 1); |
David Daney | 6888fc8 | 2010-01-07 11:05:03 -0800 | [diff] [blame] | 426 | |
| 427 | spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags); |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 428 | |
| 429 | /* Drop this packet if we have too many already queued to the HW */ |
David Daney | 6888fc8 | 2010-01-07 11:05:03 -0800 | [diff] [blame] | 430 | if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >= MAX_OUT_QUEUE_DEPTH)) { |
| 431 | if (dev->tx_queue_len != 0) { |
| 432 | /* Drop the lock when notifying the core. */ |
| 433 | spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags); |
| 434 | netif_stop_queue(dev); |
David Daney | 6888fc8 | 2010-01-07 11:05:03 -0800 | [diff] [blame] | 435 | spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags); |
David Daney | 6888fc8 | 2010-01-07 11:05:03 -0800 | [diff] [blame] | 436 | } else { |
| 437 | /* If not using normal queueing. */ |
| 438 | queue_type = QUEUE_DROP; |
| 439 | goto skip_xmit; |
| 440 | } |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 441 | } |
David Daney | 6888fc8 | 2010-01-07 11:05:03 -0800 | [diff] [blame] | 442 | |
| 443 | cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos, |
| 444 | CVMX_PKO_LOCK_NONE); |
| 445 | |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 446 | /* Send the packet to the output queue */ |
David Daney | 6888fc8 | 2010-01-07 11:05:03 -0800 | [diff] [blame] | 447 | if (unlikely(cvmx_pko_send_packet_finish(priv->port, |
| 448 | priv->queue + qos, |
| 449 | pko_command, hw_buffer, |
| 450 | CVMX_PKO_LOCK_NONE))) { |
Christian Dietrich | 7a2eaf9 | 2011-06-04 17:35:58 +0200 | [diff] [blame] | 451 | printk_ratelimited("%s: Failed to send the packet\n", dev->name); |
David Daney | 6888fc8 | 2010-01-07 11:05:03 -0800 | [diff] [blame] | 452 | queue_type = QUEUE_DROP; |
| 453 | } |
| 454 | skip_xmit: |
| 455 | to_free_list = NULL; |
| 456 | |
| 457 | switch (queue_type) { |
| 458 | case QUEUE_DROP: |
| 459 | skb->next = to_free_list; |
| 460 | to_free_list = skb; |
| 461 | priv->stats.tx_dropped++; |
| 462 | break; |
| 463 | case QUEUE_HW: |
| 464 | cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1); |
| 465 | break; |
| 466 | case QUEUE_CORE: |
| 467 | __skb_queue_tail(&priv->tx_free_list[qos], skb); |
| 468 | break; |
| 469 | default: |
| 470 | BUG(); |
| 471 | } |
| 472 | |
| 473 | while (skb_to_free > 0) { |
| 474 | struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]); |
| 475 | t->next = to_free_list; |
| 476 | to_free_list = t; |
| 477 | skb_to_free--; |
| 478 | } |
| 479 | |
| 480 | spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags); |
| 481 | |
| 482 | /* Do the actual freeing outside of the lock. */ |
| 483 | while (to_free_list) { |
| 484 | struct sk_buff *t = to_free_list; |
| 485 | to_free_list = to_free_list->next; |
| 486 | dev_kfree_skb_any(t); |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 487 | } |
| 488 | |
| 489 | if (USE_ASYNC_IOBDMA) { |
David Daney | 4898c56 | 2010-02-15 15:06:47 -0800 | [diff] [blame] | 490 | CVMX_SYNCIOBDMA; |
| 491 | total_to_clean = cvmx_scratch_read64(CVMX_SCR_SCRATCH); |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 492 | /* Restore the scratch area */ |
| 493 | cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch); |
| 494 | cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2); |
David Daney | 4898c56 | 2010-02-15 15:06:47 -0800 | [diff] [blame] | 495 | } else { |
| 496 | total_to_clean = cvmx_fau_fetch_and_add32(FAU_TOTAL_TX_TO_CLEAN, 1); |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 497 | } |
| 498 | |
David Daney | 4898c56 | 2010-02-15 15:06:47 -0800 | [diff] [blame] | 499 | if (total_to_clean & 0x3ff) { |
| 500 | /* |
| 501 | * Schedule the cleanup tasklet every 1024 packets for |
| 502 | * the pathological case of high traffic on one port |
| 503 | * delaying clean up of packets on a different port |
| 504 | * that is blocked waiting for the cleanup. |
| 505 | */ |
| 506 | tasklet_schedule(&cvm_oct_tx_cleanup_tasklet); |
| 507 | } |
| 508 | |
| 509 | cvm_oct_kick_tx_poll_watchdog(); |
| 510 | |
David Daney | 6888fc8 | 2010-01-07 11:05:03 -0800 | [diff] [blame] | 511 | return NETDEV_TX_OK; |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 512 | } |
| 513 | |
| 514 | /** |
David Daney | ec977c5 | 2010-02-16 17:25:32 -0800 | [diff] [blame] | 515 | * cvm_oct_xmit_pow - transmit a packet to the POW |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 516 | * @skb: Packet to send |
| 517 | * @dev: Device info structure |
David Daney | ec977c5 | 2010-02-16 17:25:32 -0800 | [diff] [blame] | 518 | |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 519 | * Returns Always returns zero |
| 520 | */ |
| 521 | int cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev) |
| 522 | { |
| 523 | struct octeon_ethernet *priv = netdev_priv(dev); |
| 524 | void *packet_buffer; |
| 525 | void *copy_location; |
| 526 | |
| 527 | /* Get a work queue entry */ |
| 528 | cvmx_wqe_t *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL); |
| 529 | if (unlikely(work == NULL)) { |
Christian Dietrich | 7a2eaf9 | 2011-06-04 17:35:58 +0200 | [diff] [blame] | 530 | printk_ratelimited("%s: Failed to allocate a work " |
| 531 | "queue entry\n", dev->name); |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 532 | priv->stats.tx_dropped++; |
| 533 | dev_kfree_skb(skb); |
| 534 | return 0; |
| 535 | } |
| 536 | |
| 537 | /* Get a packet buffer */ |
| 538 | packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL); |
| 539 | if (unlikely(packet_buffer == NULL)) { |
Christian Dietrich | 7a2eaf9 | 2011-06-04 17:35:58 +0200 | [diff] [blame] | 540 | printk_ratelimited("%s: Failed to allocate a packet buffer\n", |
| 541 | dev->name); |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 542 | cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, DONT_WRITEBACK(1)); |
| 543 | priv->stats.tx_dropped++; |
| 544 | dev_kfree_skb(skb); |
| 545 | return 0; |
| 546 | } |
| 547 | |
| 548 | /* |
| 549 | * Calculate where we need to copy the data to. We need to |
| 550 | * leave 8 bytes for a next pointer (unused). We also need to |
| 551 | * include any configure skip. Then we need to align the IP |
| 552 | * packet src and dest into the same 64bit word. The below |
| 553 | * calculation may add a little extra, but that doesn't |
| 554 | * hurt. |
| 555 | */ |
| 556 | copy_location = packet_buffer + sizeof(uint64_t); |
| 557 | copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6; |
| 558 | |
| 559 | /* |
| 560 | * We have to copy the packet since whoever processes this |
| 561 | * packet will free it to a hardware pool. We can't use the |
| 562 | * trick of counting outstanding packets like in |
| 563 | * cvm_oct_xmit. |
| 564 | */ |
| 565 | memcpy(copy_location, skb->data, skb->len); |
| 566 | |
| 567 | /* |
| 568 | * Fill in some of the work queue fields. We may need to add |
| 569 | * more if the software at the other end needs them. |
| 570 | */ |
| 571 | work->hw_chksum = skb->csum; |
| 572 | work->len = skb->len; |
| 573 | work->ipprt = priv->port; |
| 574 | work->qos = priv->port & 0x7; |
| 575 | work->grp = pow_send_group; |
| 576 | work->tag_type = CVMX_HELPER_INPUT_TAG_TYPE; |
| 577 | work->tag = pow_send_group; /* FIXME */ |
| 578 | /* Default to zero. Sets of zero later are commented out */ |
| 579 | work->word2.u64 = 0; |
| 580 | work->word2.s.bufs = 1; |
| 581 | work->packet_ptr.u64 = 0; |
| 582 | work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location); |
| 583 | work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL; |
| 584 | work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE; |
| 585 | work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7; |
| 586 | |
| 587 | if (skb->protocol == htons(ETH_P_IP)) { |
| 588 | work->word2.s.ip_offset = 14; |
| 589 | #if 0 |
| 590 | work->word2.s.vlan_valid = 0; /* FIXME */ |
| 591 | work->word2.s.vlan_cfi = 0; /* FIXME */ |
| 592 | work->word2.s.vlan_id = 0; /* FIXME */ |
| 593 | work->word2.s.dec_ipcomp = 0; /* FIXME */ |
| 594 | #endif |
| 595 | work->word2.s.tcp_or_udp = |
David Daney | 081f674 | 2010-01-07 11:05:06 -0800 | [diff] [blame] | 596 | (ip_hdr(skb)->protocol == IPPROTO_TCP) |
| 597 | || (ip_hdr(skb)->protocol == IPPROTO_UDP); |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 598 | #if 0 |
| 599 | /* FIXME */ |
| 600 | work->word2.s.dec_ipsec = 0; |
| 601 | /* We only support IPv4 right now */ |
| 602 | work->word2.s.is_v6 = 0; |
| 603 | /* Hardware would set to zero */ |
| 604 | work->word2.s.software = 0; |
| 605 | /* No error, packet is internal */ |
| 606 | work->word2.s.L4_error = 0; |
| 607 | #endif |
| 608 | work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0) |
| 609 | || (ip_hdr(skb)->frag_off == |
| 610 | 1 << 14)); |
| 611 | #if 0 |
| 612 | /* Assume Linux is sending a good packet */ |
| 613 | work->word2.s.IP_exc = 0; |
| 614 | #endif |
| 615 | work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST); |
| 616 | work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST); |
| 617 | #if 0 |
| 618 | /* This is an IP packet */ |
| 619 | work->word2.s.not_IP = 0; |
| 620 | /* No error, packet is internal */ |
| 621 | work->word2.s.rcv_error = 0; |
| 622 | /* No error, packet is internal */ |
| 623 | work->word2.s.err_code = 0; |
| 624 | #endif |
| 625 | |
| 626 | /* |
| 627 | * When copying the data, include 4 bytes of the |
| 628 | * ethernet header to align the same way hardware |
| 629 | * does. |
| 630 | */ |
| 631 | memcpy(work->packet_data, skb->data + 10, |
| 632 | sizeof(work->packet_data)); |
| 633 | } else { |
| 634 | #if 0 |
| 635 | work->word2.snoip.vlan_valid = 0; /* FIXME */ |
| 636 | work->word2.snoip.vlan_cfi = 0; /* FIXME */ |
| 637 | work->word2.snoip.vlan_id = 0; /* FIXME */ |
| 638 | work->word2.snoip.software = 0; /* Hardware would set to zero */ |
| 639 | #endif |
| 640 | work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP); |
| 641 | work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP); |
| 642 | work->word2.snoip.is_bcast = |
| 643 | (skb->pkt_type == PACKET_BROADCAST); |
| 644 | work->word2.snoip.is_mcast = |
| 645 | (skb->pkt_type == PACKET_MULTICAST); |
| 646 | work->word2.snoip.not_IP = 1; /* IP was done up above */ |
| 647 | #if 0 |
| 648 | /* No error, packet is internal */ |
| 649 | work->word2.snoip.rcv_error = 0; |
| 650 | /* No error, packet is internal */ |
| 651 | work->word2.snoip.err_code = 0; |
| 652 | #endif |
| 653 | memcpy(work->packet_data, skb->data, sizeof(work->packet_data)); |
| 654 | } |
| 655 | |
| 656 | /* Submit the packet to the POW */ |
| 657 | cvmx_pow_work_submit(work, work->tag, work->tag_type, work->qos, |
| 658 | work->grp); |
| 659 | priv->stats.tx_packets++; |
| 660 | priv->stats.tx_bytes += skb->len; |
| 661 | dev_kfree_skb(skb); |
| 662 | return 0; |
| 663 | } |
| 664 | |
| 665 | /** |
David Daney | ec977c5 | 2010-02-16 17:25:32 -0800 | [diff] [blame] | 666 | * cvm_oct_tx_shutdown_dev - free all skb that are currently queued for TX. |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 667 | * @dev: Device being shutdown |
David Daney | ec977c5 | 2010-02-16 17:25:32 -0800 | [diff] [blame] | 668 | * |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 669 | */ |
David Daney | 4898c56 | 2010-02-15 15:06:47 -0800 | [diff] [blame] | 670 | void cvm_oct_tx_shutdown_dev(struct net_device *dev) |
David Daney | 80ff0fd | 2009-05-05 17:35:21 -0700 | [diff] [blame] | 671 | { |
| 672 | struct octeon_ethernet *priv = netdev_priv(dev); |
| 673 | unsigned long flags; |
| 674 | int qos; |
| 675 | |
| 676 | for (qos = 0; qos < 16; qos++) { |
| 677 | spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags); |
| 678 | while (skb_queue_len(&priv->tx_free_list[qos])) |
| 679 | dev_kfree_skb_any(__skb_dequeue |
| 680 | (&priv->tx_free_list[qos])); |
| 681 | spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags); |
| 682 | } |
| 683 | } |
David Daney | 4898c56 | 2010-02-15 15:06:47 -0800 | [diff] [blame] | 684 | |
| 685 | static void cvm_oct_tx_do_cleanup(unsigned long arg) |
| 686 | { |
| 687 | int port; |
| 688 | |
| 689 | for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) { |
| 690 | if (cvm_oct_device[port]) { |
| 691 | struct net_device *dev = cvm_oct_device[port]; |
| 692 | cvm_oct_free_tx_skbs(dev); |
| 693 | } |
| 694 | } |
| 695 | } |
| 696 | |
| 697 | static irqreturn_t cvm_oct_tx_cleanup_watchdog(int cpl, void *dev_id) |
| 698 | { |
| 699 | /* Disable the interrupt. */ |
| 700 | cvmx_write_csr(CVMX_CIU_TIMX(1), 0); |
| 701 | /* Do the work in the tasklet. */ |
| 702 | tasklet_schedule(&cvm_oct_tx_cleanup_tasklet); |
| 703 | return IRQ_HANDLED; |
| 704 | } |
| 705 | |
| 706 | void cvm_oct_tx_initialize(void) |
| 707 | { |
| 708 | int i; |
| 709 | |
| 710 | /* Disable the interrupt. */ |
| 711 | cvmx_write_csr(CVMX_CIU_TIMX(1), 0); |
| 712 | /* Register an IRQ hander for to receive CIU_TIMX(1) interrupts */ |
| 713 | i = request_irq(OCTEON_IRQ_TIMER1, |
| 714 | cvm_oct_tx_cleanup_watchdog, 0, |
| 715 | "Ethernet", cvm_oct_device); |
| 716 | |
| 717 | if (i) |
| 718 | panic("Could not acquire Ethernet IRQ %d\n", OCTEON_IRQ_TIMER1); |
| 719 | } |
| 720 | |
| 721 | void cvm_oct_tx_shutdown(void) |
| 722 | { |
| 723 | /* Free the interrupt handler */ |
| 724 | free_irq(OCTEON_IRQ_TIMER1, cvm_oct_device); |
| 725 | } |