Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1 | /* |
| 2 | * cxgb3i_offload.c: Chelsio S3xx iscsi offloaded tcp connection management |
| 3 | * |
| 4 | * Copyright (C) 2003-2008 Chelsio Communications. All rights reserved. |
| 5 | * |
| 6 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 7 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 8 | * FITNESS FOR A PARTICULAR PURPOSE. See the LICENSE file included in this |
| 9 | * release for licensing terms and conditions. |
| 10 | * |
| 11 | * Written by: Dimitris Michailidis (dm@chelsio.com) |
| 12 | * Karen Xie (kxie@chelsio.com) |
| 13 | */ |
| 14 | |
| 15 | #include <linux/if_vlan.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 16 | #include <linux/slab.h> |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 17 | #include <linux/version.h> |
| 18 | |
| 19 | #include "cxgb3_defs.h" |
| 20 | #include "cxgb3_ctl_defs.h" |
| 21 | #include "firmware_exports.h" |
| 22 | #include "cxgb3i_offload.h" |
| 23 | #include "cxgb3i_pdu.h" |
| 24 | #include "cxgb3i_ddp.h" |
| 25 | |
| 26 | #ifdef __DEBUG_C3CN_CONN__ |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 27 | #define c3cn_conn_debug cxgb3i_log_debug |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 28 | #else |
| 29 | #define c3cn_conn_debug(fmt...) |
| 30 | #endif |
| 31 | |
| 32 | #ifdef __DEBUG_C3CN_TX__ |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 33 | #define c3cn_tx_debug cxgb3i_log_debug |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 34 | #else |
| 35 | #define c3cn_tx_debug(fmt...) |
| 36 | #endif |
| 37 | |
| 38 | #ifdef __DEBUG_C3CN_RX__ |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 39 | #define c3cn_rx_debug cxgb3i_log_debug |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 40 | #else |
| 41 | #define c3cn_rx_debug(fmt...) |
| 42 | #endif |
| 43 | |
| 44 | /* |
| 45 | * module parameters releated to offloaded iscsi connection |
| 46 | */ |
| 47 | static int cxgb3_rcv_win = 256 * 1024; |
| 48 | module_param(cxgb3_rcv_win, int, 0644); |
| 49 | MODULE_PARM_DESC(cxgb3_rcv_win, "TCP receive window in bytes (default=256KB)"); |
| 50 | |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 51 | static int cxgb3_snd_win = 128 * 1024; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 52 | module_param(cxgb3_snd_win, int, 0644); |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 53 | MODULE_PARM_DESC(cxgb3_snd_win, "TCP send window in bytes (default=128KB)"); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 54 | |
| 55 | static int cxgb3_rx_credit_thres = 10 * 1024; |
| 56 | module_param(cxgb3_rx_credit_thres, int, 0644); |
| 57 | MODULE_PARM_DESC(rx_credit_thres, |
| 58 | "RX credits return threshold in bytes (default=10KB)"); |
| 59 | |
| 60 | static unsigned int cxgb3_max_connect = 8 * 1024; |
| 61 | module_param(cxgb3_max_connect, uint, 0644); |
| 62 | MODULE_PARM_DESC(cxgb3_max_connect, "Max. # of connections (default=8092)"); |
| 63 | |
| 64 | static unsigned int cxgb3_sport_base = 20000; |
| 65 | module_param(cxgb3_sport_base, uint, 0644); |
| 66 | MODULE_PARM_DESC(cxgb3_sport_base, "starting port number (default=20000)"); |
| 67 | |
| 68 | /* |
| 69 | * cxgb3i tcp connection data(per adapter) list |
| 70 | */ |
| 71 | static LIST_HEAD(cdata_list); |
| 72 | static DEFINE_RWLOCK(cdata_rwlock); |
| 73 | |
| 74 | static int c3cn_push_tx_frames(struct s3_conn *c3cn, int req_completion); |
| 75 | static void c3cn_release_offload_resources(struct s3_conn *c3cn); |
| 76 | |
| 77 | /* |
| 78 | * iscsi source port management |
| 79 | * |
| 80 | * Find a free source port in the port allocation map. We use a very simple |
| 81 | * rotor scheme to look for the next free port. |
| 82 | * |
| 83 | * If a source port has been specified make sure that it doesn't collide with |
| 84 | * our normal source port allocation map. If it's outside the range of our |
| 85 | * allocation/deallocation scheme just let them use it. |
| 86 | * |
| 87 | * If the source port is outside our allocation range, the caller is |
| 88 | * responsible for keeping track of their port usage. |
| 89 | */ |
| 90 | static int c3cn_get_port(struct s3_conn *c3cn, struct cxgb3i_sdev_data *cdata) |
| 91 | { |
| 92 | unsigned int start; |
| 93 | int idx; |
| 94 | |
| 95 | if (!cdata) |
| 96 | goto error_out; |
| 97 | |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 98 | if (c3cn->saddr.sin_port) { |
| 99 | cxgb3i_log_error("connect, sin_port NON-ZERO %u.\n", |
| 100 | c3cn->saddr.sin_port); |
| 101 | return -EADDRINUSE; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 102 | } |
| 103 | |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 104 | spin_lock_bh(&cdata->lock); |
| 105 | start = idx = cdata->sport_next; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 106 | do { |
| 107 | if (++idx >= cxgb3_max_connect) |
| 108 | idx = 0; |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 109 | if (!cdata->sport_conn[idx]) { |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 110 | c3cn->saddr.sin_port = htons(cxgb3_sport_base + idx); |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 111 | cdata->sport_next = idx; |
| 112 | cdata->sport_conn[idx] = c3cn; |
| 113 | spin_unlock_bh(&cdata->lock); |
| 114 | |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 115 | c3cn_conn_debug("%s reserve port %u.\n", |
| 116 | cdata->cdev->name, |
| 117 | cxgb3_sport_base + idx); |
| 118 | return 0; |
| 119 | } |
| 120 | } while (idx != start); |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 121 | spin_unlock_bh(&cdata->lock); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 122 | |
| 123 | error_out: |
| 124 | return -EADDRNOTAVAIL; |
| 125 | } |
| 126 | |
| 127 | static void c3cn_put_port(struct s3_conn *c3cn) |
| 128 | { |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 129 | if (!c3cn->cdev) |
| 130 | return; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 131 | |
| 132 | if (c3cn->saddr.sin_port) { |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 133 | struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(c3cn->cdev); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 134 | int idx = ntohs(c3cn->saddr.sin_port) - cxgb3_sport_base; |
| 135 | |
| 136 | c3cn->saddr.sin_port = 0; |
| 137 | if (idx < 0 || idx >= cxgb3_max_connect) |
| 138 | return; |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 139 | spin_lock_bh(&cdata->lock); |
| 140 | cdata->sport_conn[idx] = NULL; |
| 141 | spin_unlock_bh(&cdata->lock); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 142 | c3cn_conn_debug("%s, release port %u.\n", |
| 143 | cdata->cdev->name, cxgb3_sport_base + idx); |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | static inline void c3cn_set_flag(struct s3_conn *c3cn, enum c3cn_flags flag) |
| 148 | { |
| 149 | __set_bit(flag, &c3cn->flags); |
| 150 | c3cn_conn_debug("c3cn 0x%p, set %d, s %u, f 0x%lx.\n", |
| 151 | c3cn, flag, c3cn->state, c3cn->flags); |
| 152 | } |
| 153 | |
| 154 | static inline void c3cn_clear_flag(struct s3_conn *c3cn, enum c3cn_flags flag) |
| 155 | { |
| 156 | __clear_bit(flag, &c3cn->flags); |
| 157 | c3cn_conn_debug("c3cn 0x%p, clear %d, s %u, f 0x%lx.\n", |
| 158 | c3cn, flag, c3cn->state, c3cn->flags); |
| 159 | } |
| 160 | |
| 161 | static inline int c3cn_flag(struct s3_conn *c3cn, enum c3cn_flags flag) |
| 162 | { |
| 163 | if (c3cn == NULL) |
| 164 | return 0; |
| 165 | return test_bit(flag, &c3cn->flags); |
| 166 | } |
| 167 | |
| 168 | static void c3cn_set_state(struct s3_conn *c3cn, int state) |
| 169 | { |
| 170 | c3cn_conn_debug("c3cn 0x%p state -> %u.\n", c3cn, state); |
| 171 | c3cn->state = state; |
| 172 | } |
| 173 | |
| 174 | static inline void c3cn_hold(struct s3_conn *c3cn) |
| 175 | { |
| 176 | atomic_inc(&c3cn->refcnt); |
| 177 | } |
| 178 | |
| 179 | static inline void c3cn_put(struct s3_conn *c3cn) |
| 180 | { |
| 181 | if (atomic_dec_and_test(&c3cn->refcnt)) { |
| 182 | c3cn_conn_debug("free c3cn 0x%p, s %u, f 0x%lx.\n", |
| 183 | c3cn, c3cn->state, c3cn->flags); |
| 184 | kfree(c3cn); |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | static void c3cn_closed(struct s3_conn *c3cn) |
| 189 | { |
| 190 | c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", |
| 191 | c3cn, c3cn->state, c3cn->flags); |
| 192 | |
| 193 | c3cn_put_port(c3cn); |
| 194 | c3cn_release_offload_resources(c3cn); |
| 195 | c3cn_set_state(c3cn, C3CN_STATE_CLOSED); |
| 196 | cxgb3i_conn_closing(c3cn); |
| 197 | } |
| 198 | |
| 199 | /* |
| 200 | * CPL (Chelsio Protocol Language) defines a message passing interface between |
| 201 | * the host driver and T3 asic. |
| 202 | * The section below implments CPLs that related to iscsi tcp connection |
| 203 | * open/close/abort and data send/receive. |
| 204 | */ |
| 205 | |
| 206 | /* |
| 207 | * CPL connection active open request: host -> |
| 208 | */ |
| 209 | static unsigned int find_best_mtu(const struct t3c_data *d, unsigned short mtu) |
| 210 | { |
| 211 | int i = 0; |
| 212 | |
| 213 | while (i < d->nmtus - 1 && d->mtus[i + 1] <= mtu) |
| 214 | ++i; |
| 215 | return i; |
| 216 | } |
| 217 | |
| 218 | static unsigned int select_mss(struct s3_conn *c3cn, unsigned int pmtu) |
| 219 | { |
| 220 | unsigned int idx; |
| 221 | struct dst_entry *dst = c3cn->dst_cache; |
| 222 | struct t3cdev *cdev = c3cn->cdev; |
| 223 | const struct t3c_data *td = T3C_DATA(cdev); |
| 224 | u16 advmss = dst_metric(dst, RTAX_ADVMSS); |
| 225 | |
| 226 | if (advmss > pmtu - 40) |
| 227 | advmss = pmtu - 40; |
| 228 | if (advmss < td->mtus[0] - 40) |
| 229 | advmss = td->mtus[0] - 40; |
| 230 | idx = find_best_mtu(td, advmss + 40); |
| 231 | return idx; |
| 232 | } |
| 233 | |
| 234 | static inline int compute_wscale(int win) |
| 235 | { |
| 236 | int wscale = 0; |
| 237 | while (wscale < 14 && (65535<<wscale) < win) |
| 238 | wscale++; |
| 239 | return wscale; |
| 240 | } |
| 241 | |
| 242 | static inline unsigned int calc_opt0h(struct s3_conn *c3cn) |
| 243 | { |
| 244 | int wscale = compute_wscale(cxgb3_rcv_win); |
| 245 | return V_KEEP_ALIVE(1) | |
| 246 | F_TCAM_BYPASS | |
| 247 | V_WND_SCALE(wscale) | |
| 248 | V_MSS_IDX(c3cn->mss_idx); |
| 249 | } |
| 250 | |
| 251 | static inline unsigned int calc_opt0l(struct s3_conn *c3cn) |
| 252 | { |
| 253 | return V_ULP_MODE(ULP_MODE_ISCSI) | |
| 254 | V_RCV_BUFSIZ(cxgb3_rcv_win>>10); |
| 255 | } |
| 256 | |
| 257 | static void make_act_open_req(struct s3_conn *c3cn, struct sk_buff *skb, |
| 258 | unsigned int atid, const struct l2t_entry *e) |
| 259 | { |
| 260 | struct cpl_act_open_req *req; |
| 261 | |
| 262 | c3cn_conn_debug("c3cn 0x%p, atid 0x%x.\n", c3cn, atid); |
| 263 | |
| 264 | skb->priority = CPL_PRIORITY_SETUP; |
| 265 | req = (struct cpl_act_open_req *)__skb_put(skb, sizeof(*req)); |
| 266 | req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD)); |
Karen Xie | 593d572 | 2010-06-16 17:10:37 -0700 | [diff] [blame] | 267 | req->wr.wr_lo = 0; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 268 | OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, atid)); |
| 269 | req->local_port = c3cn->saddr.sin_port; |
| 270 | req->peer_port = c3cn->daddr.sin_port; |
| 271 | req->local_ip = c3cn->saddr.sin_addr.s_addr; |
| 272 | req->peer_ip = c3cn->daddr.sin_addr.s_addr; |
| 273 | req->opt0h = htonl(calc_opt0h(c3cn) | V_L2T_IDX(e->idx) | |
| 274 | V_TX_CHANNEL(e->smt_idx)); |
| 275 | req->opt0l = htonl(calc_opt0l(c3cn)); |
| 276 | req->params = 0; |
Karen Xie | 593d572 | 2010-06-16 17:10:37 -0700 | [diff] [blame] | 277 | req->opt2 = 0; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 278 | } |
| 279 | |
| 280 | static void fail_act_open(struct s3_conn *c3cn, int errno) |
| 281 | { |
| 282 | c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", |
| 283 | c3cn, c3cn->state, c3cn->flags); |
| 284 | c3cn->err = errno; |
| 285 | c3cn_closed(c3cn); |
| 286 | } |
| 287 | |
| 288 | static void act_open_req_arp_failure(struct t3cdev *dev, struct sk_buff *skb) |
| 289 | { |
| 290 | struct s3_conn *c3cn = (struct s3_conn *)skb->sk; |
| 291 | |
| 292 | c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state); |
| 293 | |
| 294 | c3cn_hold(c3cn); |
| 295 | spin_lock_bh(&c3cn->lock); |
| 296 | if (c3cn->state == C3CN_STATE_CONNECTING) |
kxie@chelsio.com | 0109abf | 2009-12-09 21:25:36 -0800 | [diff] [blame] | 297 | fail_act_open(c3cn, -EHOSTUNREACH); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 298 | spin_unlock_bh(&c3cn->lock); |
| 299 | c3cn_put(c3cn); |
| 300 | __kfree_skb(skb); |
| 301 | } |
| 302 | |
| 303 | /* |
| 304 | * CPL connection close request: host -> |
| 305 | * |
| 306 | * Close a connection by sending a CPL_CLOSE_CON_REQ message and queue it to |
| 307 | * the write queue (i.e., after any unsent txt data). |
| 308 | */ |
| 309 | static void skb_entail(struct s3_conn *c3cn, struct sk_buff *skb, |
| 310 | int flags) |
| 311 | { |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 312 | skb_tcp_seq(skb) = c3cn->write_seq; |
| 313 | skb_flags(skb) = flags; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 314 | __skb_queue_tail(&c3cn->write_queue, skb); |
| 315 | } |
| 316 | |
| 317 | static void send_close_req(struct s3_conn *c3cn) |
| 318 | { |
| 319 | struct sk_buff *skb = c3cn->cpl_close; |
| 320 | struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head; |
| 321 | unsigned int tid = c3cn->tid; |
| 322 | |
| 323 | c3cn_conn_debug("c3cn 0x%p, state 0x%x, flag 0x%lx.\n", |
| 324 | c3cn, c3cn->state, c3cn->flags); |
| 325 | |
| 326 | c3cn->cpl_close = NULL; |
| 327 | |
| 328 | req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_CLOSE_CON)); |
| 329 | req->wr.wr_lo = htonl(V_WR_TID(tid)); |
| 330 | OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid)); |
| 331 | req->rsvd = htonl(c3cn->write_seq); |
| 332 | |
| 333 | skb_entail(c3cn, skb, C3CB_FLAG_NO_APPEND); |
| 334 | if (c3cn->state != C3CN_STATE_CONNECTING) |
| 335 | c3cn_push_tx_frames(c3cn, 1); |
| 336 | } |
| 337 | |
| 338 | /* |
| 339 | * CPL connection abort request: host -> |
| 340 | * |
| 341 | * Send an ABORT_REQ message. Makes sure we do not send multiple ABORT_REQs |
| 342 | * for the same connection and also that we do not try to send a message |
| 343 | * after the connection has closed. |
| 344 | */ |
| 345 | static void abort_arp_failure(struct t3cdev *cdev, struct sk_buff *skb) |
| 346 | { |
| 347 | struct cpl_abort_req *req = cplhdr(skb); |
| 348 | |
| 349 | c3cn_conn_debug("tdev 0x%p.\n", cdev); |
| 350 | |
| 351 | req->cmd = CPL_ABORT_NO_RST; |
| 352 | cxgb3_ofld_send(cdev, skb); |
| 353 | } |
| 354 | |
| 355 | static inline void c3cn_purge_write_queue(struct s3_conn *c3cn) |
| 356 | { |
| 357 | struct sk_buff *skb; |
| 358 | |
| 359 | while ((skb = __skb_dequeue(&c3cn->write_queue))) |
| 360 | __kfree_skb(skb); |
| 361 | } |
| 362 | |
| 363 | static void send_abort_req(struct s3_conn *c3cn) |
| 364 | { |
| 365 | struct sk_buff *skb = c3cn->cpl_abort_req; |
| 366 | struct cpl_abort_req *req; |
| 367 | unsigned int tid = c3cn->tid; |
| 368 | |
| 369 | if (unlikely(c3cn->state == C3CN_STATE_ABORTING) || !skb || |
| 370 | !c3cn->cdev) |
| 371 | return; |
| 372 | |
| 373 | c3cn_set_state(c3cn, C3CN_STATE_ABORTING); |
| 374 | |
| 375 | c3cn_conn_debug("c3cn 0x%p, flag ABORT_RPL + ABORT_SHUT.\n", c3cn); |
| 376 | |
| 377 | c3cn_set_flag(c3cn, C3CN_ABORT_RPL_PENDING); |
| 378 | |
| 379 | /* Purge the send queue so we don't send anything after an abort. */ |
| 380 | c3cn_purge_write_queue(c3cn); |
| 381 | |
| 382 | c3cn->cpl_abort_req = NULL; |
| 383 | req = (struct cpl_abort_req *)skb->head; |
Karen Xie | 593d572 | 2010-06-16 17:10:37 -0700 | [diff] [blame] | 384 | memset(req, 0, sizeof(*req)); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 385 | |
| 386 | skb->priority = CPL_PRIORITY_DATA; |
| 387 | set_arp_failure_handler(skb, abort_arp_failure); |
| 388 | |
| 389 | req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_REQ)); |
| 390 | req->wr.wr_lo = htonl(V_WR_TID(tid)); |
| 391 | OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ABORT_REQ, tid)); |
| 392 | req->rsvd0 = htonl(c3cn->snd_nxt); |
| 393 | req->rsvd1 = !c3cn_flag(c3cn, C3CN_TX_DATA_SENT); |
| 394 | req->cmd = CPL_ABORT_SEND_RST; |
| 395 | |
| 396 | l2t_send(c3cn->cdev, skb, c3cn->l2t); |
| 397 | } |
| 398 | |
| 399 | /* |
| 400 | * CPL connection abort reply: host -> |
| 401 | * |
| 402 | * Send an ABORT_RPL message in response of the ABORT_REQ received. |
| 403 | */ |
| 404 | static void send_abort_rpl(struct s3_conn *c3cn, int rst_status) |
| 405 | { |
| 406 | struct sk_buff *skb = c3cn->cpl_abort_rpl; |
| 407 | struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head; |
| 408 | |
| 409 | c3cn->cpl_abort_rpl = NULL; |
| 410 | |
| 411 | skb->priority = CPL_PRIORITY_DATA; |
Karen Xie | 593d572 | 2010-06-16 17:10:37 -0700 | [diff] [blame] | 412 | memset(rpl, 0, sizeof(*rpl)); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 413 | rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL)); |
| 414 | rpl->wr.wr_lo = htonl(V_WR_TID(c3cn->tid)); |
| 415 | OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, c3cn->tid)); |
| 416 | rpl->cmd = rst_status; |
| 417 | |
| 418 | cxgb3_ofld_send(c3cn->cdev, skb); |
| 419 | } |
| 420 | |
| 421 | /* |
| 422 | * CPL connection rx data ack: host -> |
| 423 | * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of |
| 424 | * credits sent. |
| 425 | */ |
| 426 | static u32 send_rx_credits(struct s3_conn *c3cn, u32 credits, u32 dack) |
| 427 | { |
| 428 | struct sk_buff *skb; |
| 429 | struct cpl_rx_data_ack *req; |
| 430 | |
| 431 | skb = alloc_skb(sizeof(*req), GFP_ATOMIC); |
| 432 | if (!skb) |
| 433 | return 0; |
| 434 | |
| 435 | req = (struct cpl_rx_data_ack *)__skb_put(skb, sizeof(*req)); |
| 436 | req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD)); |
Karen Xie | 593d572 | 2010-06-16 17:10:37 -0700 | [diff] [blame] | 437 | req->wr.wr_lo = 0; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 438 | OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_RX_DATA_ACK, c3cn->tid)); |
| 439 | req->credit_dack = htonl(dack | V_RX_CREDITS(credits)); |
| 440 | skb->priority = CPL_PRIORITY_ACK; |
| 441 | cxgb3_ofld_send(c3cn->cdev, skb); |
| 442 | return credits; |
| 443 | } |
| 444 | |
| 445 | /* |
| 446 | * CPL connection tx data: host -> |
| 447 | * |
| 448 | * Send iscsi PDU via TX_DATA CPL message. Returns the number of |
| 449 | * credits sent. |
| 450 | * Each TX_DATA consumes work request credit (wrs), so we need to keep track of |
| 451 | * how many we've used so far and how many are pending (i.e., yet ack'ed by T3). |
| 452 | */ |
| 453 | |
| 454 | /* |
| 455 | * For ULP connections HW may inserts digest bytes into the pdu. Those digest |
| 456 | * bytes are not sent by the host but are part of the TCP payload and therefore |
| 457 | * consume TCP sequence space. |
| 458 | */ |
| 459 | static const unsigned int cxgb3_ulp_extra_len[] = { 0, 4, 4, 8 }; |
| 460 | static inline unsigned int ulp_extra_len(const struct sk_buff *skb) |
| 461 | { |
| 462 | return cxgb3_ulp_extra_len[skb_ulp_mode(skb) & 3]; |
| 463 | } |
| 464 | |
| 465 | static unsigned int wrlen __read_mostly; |
| 466 | |
| 467 | /* |
| 468 | * The number of WRs needed for an skb depends on the number of fragments |
| 469 | * in the skb and whether it has any payload in its main body. This maps the |
| 470 | * length of the gather list represented by an skb into the # of necessary WRs. |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 471 | * The extra two fragments are for iscsi bhs and payload padding. |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 472 | */ |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 473 | #define SKB_WR_LIST_SIZE (MAX_SKB_FRAGS + 2) |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 474 | static unsigned int skb_wrs[SKB_WR_LIST_SIZE] __read_mostly; |
| 475 | |
| 476 | static void s3_init_wr_tab(unsigned int wr_len) |
| 477 | { |
| 478 | int i; |
| 479 | |
| 480 | if (skb_wrs[1]) /* already initialized */ |
| 481 | return; |
| 482 | |
| 483 | for (i = 1; i < SKB_WR_LIST_SIZE; i++) { |
| 484 | int sgl_len = (3 * i) / 2 + (i & 1); |
| 485 | |
| 486 | sgl_len += 3; |
| 487 | skb_wrs[i] = (sgl_len <= wr_len |
| 488 | ? 1 : 1 + (sgl_len - 2) / (wr_len - 1)); |
| 489 | } |
| 490 | |
| 491 | wrlen = wr_len * 8; |
| 492 | } |
| 493 | |
| 494 | static inline void reset_wr_list(struct s3_conn *c3cn) |
| 495 | { |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 496 | c3cn->wr_pending_head = c3cn->wr_pending_tail = NULL; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 497 | } |
| 498 | |
| 499 | /* |
| 500 | * Add a WR to a connections's list of pending WRs. This is a singly-linked |
| 501 | * list of sk_buffs operating as a FIFO. The head is kept in wr_pending_head |
| 502 | * and the tail in wr_pending_tail. |
| 503 | */ |
| 504 | static inline void enqueue_wr(struct s3_conn *c3cn, |
| 505 | struct sk_buff *skb) |
| 506 | { |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 507 | skb_tx_wr_next(skb) = NULL; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 508 | |
| 509 | /* |
| 510 | * We want to take an extra reference since both us and the driver |
| 511 | * need to free the packet before it's really freed. We know there's |
| 512 | * just one user currently so we use atomic_set rather than skb_get |
| 513 | * to avoid the atomic op. |
| 514 | */ |
| 515 | atomic_set(&skb->users, 2); |
| 516 | |
| 517 | if (!c3cn->wr_pending_head) |
| 518 | c3cn->wr_pending_head = skb; |
| 519 | else |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 520 | skb_tx_wr_next(c3cn->wr_pending_tail) = skb; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 521 | c3cn->wr_pending_tail = skb; |
| 522 | } |
| 523 | |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 524 | static int count_pending_wrs(struct s3_conn *c3cn) |
| 525 | { |
| 526 | int n = 0; |
| 527 | const struct sk_buff *skb = c3cn->wr_pending_head; |
| 528 | |
| 529 | while (skb) { |
| 530 | n += skb->csum; |
| 531 | skb = skb_tx_wr_next(skb); |
| 532 | } |
| 533 | return n; |
| 534 | } |
| 535 | |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 536 | static inline struct sk_buff *peek_wr(const struct s3_conn *c3cn) |
| 537 | { |
| 538 | return c3cn->wr_pending_head; |
| 539 | } |
| 540 | |
| 541 | static inline void free_wr_skb(struct sk_buff *skb) |
| 542 | { |
| 543 | kfree_skb(skb); |
| 544 | } |
| 545 | |
| 546 | static inline struct sk_buff *dequeue_wr(struct s3_conn *c3cn) |
| 547 | { |
| 548 | struct sk_buff *skb = c3cn->wr_pending_head; |
| 549 | |
| 550 | if (likely(skb)) { |
| 551 | /* Don't bother clearing the tail */ |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 552 | c3cn->wr_pending_head = skb_tx_wr_next(skb); |
| 553 | skb_tx_wr_next(skb) = NULL; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 554 | } |
| 555 | return skb; |
| 556 | } |
| 557 | |
| 558 | static void purge_wr_queue(struct s3_conn *c3cn) |
| 559 | { |
| 560 | struct sk_buff *skb; |
| 561 | while ((skb = dequeue_wr(c3cn)) != NULL) |
| 562 | free_wr_skb(skb); |
| 563 | } |
| 564 | |
| 565 | static inline void make_tx_data_wr(struct s3_conn *c3cn, struct sk_buff *skb, |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 566 | int len, int req_completion) |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 567 | { |
| 568 | struct tx_data_wr *req; |
| 569 | |
| 570 | skb_reset_transport_header(skb); |
| 571 | req = (struct tx_data_wr *)__skb_push(skb, sizeof(*req)); |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 572 | req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA) | |
| 573 | (req_completion ? F_WR_COMPL : 0)); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 574 | req->wr_lo = htonl(V_WR_TID(c3cn->tid)); |
| 575 | req->sndseq = htonl(c3cn->snd_nxt); |
| 576 | /* len includes the length of any HW ULP additions */ |
| 577 | req->len = htonl(len); |
| 578 | req->param = htonl(V_TX_PORT(c3cn->l2t->smt_idx)); |
| 579 | /* V_TX_ULP_SUBMODE sets both the mode and submode */ |
| 580 | req->flags = htonl(V_TX_ULP_SUBMODE(skb_ulp_mode(skb)) | |
| 581 | V_TX_SHOVE((skb_peek(&c3cn->write_queue) ? 0 : 1))); |
| 582 | |
| 583 | if (!c3cn_flag(c3cn, C3CN_TX_DATA_SENT)) { |
| 584 | req->flags |= htonl(V_TX_ACK_PAGES(2) | F_TX_INIT | |
| 585 | V_TX_CPU_IDX(c3cn->qset)); |
| 586 | /* Sendbuffer is in units of 32KB. */ |
| 587 | req->param |= htonl(V_TX_SNDBUF(cxgb3_snd_win >> 15)); |
| 588 | c3cn_set_flag(c3cn, C3CN_TX_DATA_SENT); |
| 589 | } |
| 590 | } |
| 591 | |
| 592 | /** |
| 593 | * c3cn_push_tx_frames -- start transmit |
| 594 | * @c3cn: the offloaded connection |
| 595 | * @req_completion: request wr_ack or not |
| 596 | * |
| 597 | * Prepends TX_DATA_WR or CPL_CLOSE_CON_REQ headers to buffers waiting in a |
| 598 | * connection's send queue and sends them on to T3. Must be called with the |
| 599 | * connection's lock held. Returns the amount of send buffer space that was |
| 600 | * freed as a result of sending queued data to T3. |
| 601 | */ |
| 602 | static void arp_failure_discard(struct t3cdev *cdev, struct sk_buff *skb) |
| 603 | { |
| 604 | kfree_skb(skb); |
| 605 | } |
| 606 | |
| 607 | static int c3cn_push_tx_frames(struct s3_conn *c3cn, int req_completion) |
| 608 | { |
| 609 | int total_size = 0; |
| 610 | struct sk_buff *skb; |
| 611 | struct t3cdev *cdev; |
| 612 | struct cxgb3i_sdev_data *cdata; |
| 613 | |
| 614 | if (unlikely(c3cn->state == C3CN_STATE_CONNECTING || |
| 615 | c3cn->state == C3CN_STATE_CLOSE_WAIT_1 || |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 616 | c3cn->state >= C3CN_STATE_ABORTING)) { |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 617 | c3cn_tx_debug("c3cn 0x%p, in closing state %u.\n", |
| 618 | c3cn, c3cn->state); |
| 619 | return 0; |
| 620 | } |
| 621 | |
| 622 | cdev = c3cn->cdev; |
| 623 | cdata = CXGB3_SDEV_DATA(cdev); |
| 624 | |
| 625 | while (c3cn->wr_avail |
| 626 | && (skb = skb_peek(&c3cn->write_queue)) != NULL) { |
| 627 | int len = skb->len; /* length before skb_push */ |
| 628 | int frags = skb_shinfo(skb)->nr_frags + (len != skb->data_len); |
| 629 | int wrs_needed = skb_wrs[frags]; |
| 630 | |
| 631 | if (wrs_needed > 1 && len + sizeof(struct tx_data_wr) <= wrlen) |
| 632 | wrs_needed = 1; |
| 633 | |
| 634 | WARN_ON(frags >= SKB_WR_LIST_SIZE || wrs_needed < 1); |
| 635 | |
| 636 | if (c3cn->wr_avail < wrs_needed) { |
| 637 | c3cn_tx_debug("c3cn 0x%p, skb len %u/%u, frag %u, " |
| 638 | "wr %d < %u.\n", |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 639 | c3cn, skb->len, skb->data_len, frags, |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 640 | wrs_needed, c3cn->wr_avail); |
| 641 | break; |
| 642 | } |
| 643 | |
| 644 | __skb_unlink(skb, &c3cn->write_queue); |
| 645 | skb->priority = CPL_PRIORITY_DATA; |
| 646 | skb->csum = wrs_needed; /* remember this until the WR_ACK */ |
| 647 | c3cn->wr_avail -= wrs_needed; |
| 648 | c3cn->wr_unacked += wrs_needed; |
| 649 | enqueue_wr(c3cn, skb); |
| 650 | |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 651 | c3cn_tx_debug("c3cn 0x%p, enqueue, skb len %u/%u, frag %u, " |
| 652 | "wr %d, left %u, unack %u.\n", |
| 653 | c3cn, skb->len, skb->data_len, frags, |
| 654 | wrs_needed, c3cn->wr_avail, c3cn->wr_unacked); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 655 | |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 656 | |
| 657 | if (likely(skb_flags(skb) & C3CB_FLAG_NEED_HDR)) { |
| 658 | if ((req_completion && |
| 659 | c3cn->wr_unacked == wrs_needed) || |
| 660 | (skb_flags(skb) & C3CB_FLAG_COMPL) || |
| 661 | c3cn->wr_unacked >= c3cn->wr_max / 2) { |
| 662 | req_completion = 1; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 663 | c3cn->wr_unacked = 0; |
| 664 | } |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 665 | len += ulp_extra_len(skb); |
| 666 | make_tx_data_wr(c3cn, skb, len, req_completion); |
| 667 | c3cn->snd_nxt += len; |
| 668 | skb_flags(skb) &= ~C3CB_FLAG_NEED_HDR; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 669 | } |
| 670 | |
| 671 | total_size += skb->truesize; |
| 672 | set_arp_failure_handler(skb, arp_failure_discard); |
| 673 | l2t_send(cdev, skb, c3cn->l2t); |
| 674 | } |
| 675 | return total_size; |
| 676 | } |
| 677 | |
| 678 | /* |
| 679 | * process_cpl_msg: -> host |
| 680 | * Top-level CPL message processing used by most CPL messages that |
| 681 | * pertain to connections. |
| 682 | */ |
| 683 | static inline void process_cpl_msg(void (*fn)(struct s3_conn *, |
| 684 | struct sk_buff *), |
| 685 | struct s3_conn *c3cn, |
| 686 | struct sk_buff *skb) |
| 687 | { |
| 688 | spin_lock_bh(&c3cn->lock); |
| 689 | fn(c3cn, skb); |
| 690 | spin_unlock_bh(&c3cn->lock); |
| 691 | } |
| 692 | |
| 693 | /* |
| 694 | * process_cpl_msg_ref: -> host |
| 695 | * Similar to process_cpl_msg() but takes an extra connection reference around |
| 696 | * the call to the handler. Should be used if the handler may drop a |
| 697 | * connection reference. |
| 698 | */ |
| 699 | static inline void process_cpl_msg_ref(void (*fn) (struct s3_conn *, |
| 700 | struct sk_buff *), |
| 701 | struct s3_conn *c3cn, |
| 702 | struct sk_buff *skb) |
| 703 | { |
| 704 | c3cn_hold(c3cn); |
| 705 | process_cpl_msg(fn, c3cn, skb); |
| 706 | c3cn_put(c3cn); |
| 707 | } |
| 708 | |
| 709 | /* |
| 710 | * Process a CPL_ACT_ESTABLISH message: -> host |
| 711 | * Updates connection state from an active establish CPL message. Runs with |
| 712 | * the connection lock held. |
| 713 | */ |
| 714 | |
| 715 | static inline void s3_free_atid(struct t3cdev *cdev, unsigned int tid) |
| 716 | { |
| 717 | struct s3_conn *c3cn = cxgb3_free_atid(cdev, tid); |
| 718 | if (c3cn) |
| 719 | c3cn_put(c3cn); |
| 720 | } |
| 721 | |
| 722 | static void c3cn_established(struct s3_conn *c3cn, u32 snd_isn, |
| 723 | unsigned int opt) |
| 724 | { |
| 725 | c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state); |
| 726 | |
| 727 | c3cn->write_seq = c3cn->snd_nxt = c3cn->snd_una = snd_isn; |
| 728 | |
| 729 | /* |
| 730 | * Causes the first RX_DATA_ACK to supply any Rx credits we couldn't |
| 731 | * pass through opt0. |
| 732 | */ |
| 733 | if (cxgb3_rcv_win > (M_RCV_BUFSIZ << 10)) |
| 734 | c3cn->rcv_wup -= cxgb3_rcv_win - (M_RCV_BUFSIZ << 10); |
| 735 | |
| 736 | dst_confirm(c3cn->dst_cache); |
| 737 | |
| 738 | smp_mb(); |
| 739 | |
| 740 | c3cn_set_state(c3cn, C3CN_STATE_ESTABLISHED); |
| 741 | } |
| 742 | |
| 743 | static void process_act_establish(struct s3_conn *c3cn, struct sk_buff *skb) |
| 744 | { |
| 745 | struct cpl_act_establish *req = cplhdr(skb); |
| 746 | u32 rcv_isn = ntohl(req->rcv_isn); /* real RCV_ISN + 1 */ |
| 747 | |
| 748 | c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", |
| 749 | c3cn, c3cn->state, c3cn->flags); |
| 750 | |
| 751 | if (unlikely(c3cn->state != C3CN_STATE_CONNECTING)) |
| 752 | cxgb3i_log_error("TID %u expected SYN_SENT, got EST., s %u\n", |
| 753 | c3cn->tid, c3cn->state); |
| 754 | |
| 755 | c3cn->copied_seq = c3cn->rcv_wup = c3cn->rcv_nxt = rcv_isn; |
| 756 | c3cn_established(c3cn, ntohl(req->snd_isn), ntohs(req->tcp_opt)); |
| 757 | |
| 758 | __kfree_skb(skb); |
| 759 | |
| 760 | if (unlikely(c3cn_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED))) |
| 761 | /* upper layer has requested closing */ |
| 762 | send_abort_req(c3cn); |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 763 | else { |
| 764 | if (skb_queue_len(&c3cn->write_queue)) |
| 765 | c3cn_push_tx_frames(c3cn, 1); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 766 | cxgb3i_conn_tx_open(c3cn); |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 767 | } |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 768 | } |
| 769 | |
| 770 | static int do_act_establish(struct t3cdev *cdev, struct sk_buff *skb, |
| 771 | void *ctx) |
| 772 | { |
| 773 | struct cpl_act_establish *req = cplhdr(skb); |
| 774 | unsigned int tid = GET_TID(req); |
| 775 | unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid)); |
| 776 | struct s3_conn *c3cn = ctx; |
| 777 | struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(cdev); |
| 778 | |
| 779 | c3cn_conn_debug("rcv, tid 0x%x, c3cn 0x%p, s %u, f 0x%lx.\n", |
| 780 | tid, c3cn, c3cn->state, c3cn->flags); |
| 781 | |
| 782 | c3cn->tid = tid; |
| 783 | c3cn_hold(c3cn); |
| 784 | cxgb3_insert_tid(cdata->cdev, cdata->client, c3cn, tid); |
| 785 | s3_free_atid(cdev, atid); |
| 786 | |
| 787 | c3cn->qset = G_QNUM(ntohl(skb->csum)); |
| 788 | |
| 789 | process_cpl_msg(process_act_establish, c3cn, skb); |
| 790 | return 0; |
| 791 | } |
| 792 | |
| 793 | /* |
| 794 | * Process a CPL_ACT_OPEN_RPL message: -> host |
| 795 | * Handle active open failures. |
| 796 | */ |
| 797 | static int act_open_rpl_status_to_errno(int status) |
| 798 | { |
| 799 | switch (status) { |
| 800 | case CPL_ERR_CONN_RESET: |
kxie@chelsio.com | 0109abf | 2009-12-09 21:25:36 -0800 | [diff] [blame] | 801 | return -ECONNREFUSED; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 802 | case CPL_ERR_ARP_MISS: |
kxie@chelsio.com | 0109abf | 2009-12-09 21:25:36 -0800 | [diff] [blame] | 803 | return -EHOSTUNREACH; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 804 | case CPL_ERR_CONN_TIMEDOUT: |
kxie@chelsio.com | 0109abf | 2009-12-09 21:25:36 -0800 | [diff] [blame] | 805 | return -ETIMEDOUT; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 806 | case CPL_ERR_TCAM_FULL: |
kxie@chelsio.com | 0109abf | 2009-12-09 21:25:36 -0800 | [diff] [blame] | 807 | return -ENOMEM; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 808 | case CPL_ERR_CONN_EXIST: |
| 809 | cxgb3i_log_error("ACTIVE_OPEN_RPL: 4-tuple in use\n"); |
kxie@chelsio.com | 0109abf | 2009-12-09 21:25:36 -0800 | [diff] [blame] | 810 | return -EADDRINUSE; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 811 | default: |
kxie@chelsio.com | 0109abf | 2009-12-09 21:25:36 -0800 | [diff] [blame] | 812 | return -EIO; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 813 | } |
| 814 | } |
| 815 | |
| 816 | static void act_open_retry_timer(unsigned long data) |
| 817 | { |
| 818 | struct sk_buff *skb; |
| 819 | struct s3_conn *c3cn = (struct s3_conn *)data; |
| 820 | |
| 821 | c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state); |
| 822 | |
| 823 | spin_lock_bh(&c3cn->lock); |
| 824 | skb = alloc_skb(sizeof(struct cpl_act_open_req), GFP_ATOMIC); |
| 825 | if (!skb) |
kxie@chelsio.com | 0109abf | 2009-12-09 21:25:36 -0800 | [diff] [blame] | 826 | fail_act_open(c3cn, -ENOMEM); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 827 | else { |
| 828 | skb->sk = (struct sock *)c3cn; |
| 829 | set_arp_failure_handler(skb, act_open_req_arp_failure); |
| 830 | make_act_open_req(c3cn, skb, c3cn->tid, c3cn->l2t); |
| 831 | l2t_send(c3cn->cdev, skb, c3cn->l2t); |
| 832 | } |
| 833 | spin_unlock_bh(&c3cn->lock); |
| 834 | c3cn_put(c3cn); |
| 835 | } |
| 836 | |
| 837 | static void process_act_open_rpl(struct s3_conn *c3cn, struct sk_buff *skb) |
| 838 | { |
| 839 | struct cpl_act_open_rpl *rpl = cplhdr(skb); |
| 840 | |
| 841 | c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", |
| 842 | c3cn, c3cn->state, c3cn->flags); |
| 843 | |
| 844 | if (rpl->status == CPL_ERR_CONN_EXIST && |
| 845 | c3cn->retry_timer.function != act_open_retry_timer) { |
| 846 | c3cn->retry_timer.function = act_open_retry_timer; |
| 847 | if (!mod_timer(&c3cn->retry_timer, jiffies + HZ / 2)) |
| 848 | c3cn_hold(c3cn); |
| 849 | } else |
| 850 | fail_act_open(c3cn, act_open_rpl_status_to_errno(rpl->status)); |
| 851 | __kfree_skb(skb); |
| 852 | } |
| 853 | |
| 854 | static int do_act_open_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx) |
| 855 | { |
| 856 | struct s3_conn *c3cn = ctx; |
| 857 | struct cpl_act_open_rpl *rpl = cplhdr(skb); |
| 858 | |
| 859 | c3cn_conn_debug("rcv, status 0x%x, c3cn 0x%p, s %u, f 0x%lx.\n", |
| 860 | rpl->status, c3cn, c3cn->state, c3cn->flags); |
| 861 | |
| 862 | if (rpl->status != CPL_ERR_TCAM_FULL && |
| 863 | rpl->status != CPL_ERR_CONN_EXIST && |
| 864 | rpl->status != CPL_ERR_ARP_MISS) |
| 865 | cxgb3_queue_tid_release(cdev, GET_TID(rpl)); |
| 866 | |
| 867 | process_cpl_msg_ref(process_act_open_rpl, c3cn, skb); |
| 868 | return 0; |
| 869 | } |
| 870 | |
| 871 | /* |
| 872 | * Process PEER_CLOSE CPL messages: -> host |
| 873 | * Handle peer FIN. |
| 874 | */ |
| 875 | static void process_peer_close(struct s3_conn *c3cn, struct sk_buff *skb) |
| 876 | { |
| 877 | c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", |
| 878 | c3cn, c3cn->state, c3cn->flags); |
| 879 | |
| 880 | if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) |
| 881 | goto out; |
| 882 | |
| 883 | switch (c3cn->state) { |
| 884 | case C3CN_STATE_ESTABLISHED: |
| 885 | c3cn_set_state(c3cn, C3CN_STATE_PASSIVE_CLOSE); |
| 886 | break; |
| 887 | case C3CN_STATE_ACTIVE_CLOSE: |
| 888 | c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_2); |
| 889 | break; |
| 890 | case C3CN_STATE_CLOSE_WAIT_1: |
| 891 | c3cn_closed(c3cn); |
| 892 | break; |
| 893 | case C3CN_STATE_ABORTING: |
| 894 | break; |
| 895 | default: |
| 896 | cxgb3i_log_error("%s: peer close, TID %u in bad state %u\n", |
| 897 | c3cn->cdev->name, c3cn->tid, c3cn->state); |
| 898 | } |
| 899 | |
| 900 | cxgb3i_conn_closing(c3cn); |
| 901 | out: |
| 902 | __kfree_skb(skb); |
| 903 | } |
| 904 | |
| 905 | static int do_peer_close(struct t3cdev *cdev, struct sk_buff *skb, void *ctx) |
| 906 | { |
| 907 | struct s3_conn *c3cn = ctx; |
| 908 | |
| 909 | c3cn_conn_debug("rcv, c3cn 0x%p, s %u, f 0x%lx.\n", |
| 910 | c3cn, c3cn->state, c3cn->flags); |
| 911 | process_cpl_msg_ref(process_peer_close, c3cn, skb); |
| 912 | return 0; |
| 913 | } |
| 914 | |
| 915 | /* |
| 916 | * Process CLOSE_CONN_RPL CPL message: -> host |
| 917 | * Process a peer ACK to our FIN. |
| 918 | */ |
| 919 | static void process_close_con_rpl(struct s3_conn *c3cn, struct sk_buff *skb) |
| 920 | { |
| 921 | struct cpl_close_con_rpl *rpl = cplhdr(skb); |
| 922 | |
| 923 | c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", |
| 924 | c3cn, c3cn->state, c3cn->flags); |
| 925 | |
| 926 | c3cn->snd_una = ntohl(rpl->snd_nxt) - 1; /* exclude FIN */ |
| 927 | |
| 928 | if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) |
| 929 | goto out; |
| 930 | |
| 931 | switch (c3cn->state) { |
| 932 | case C3CN_STATE_ACTIVE_CLOSE: |
| 933 | c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_1); |
| 934 | break; |
| 935 | case C3CN_STATE_CLOSE_WAIT_1: |
| 936 | case C3CN_STATE_CLOSE_WAIT_2: |
| 937 | c3cn_closed(c3cn); |
| 938 | break; |
| 939 | case C3CN_STATE_ABORTING: |
| 940 | break; |
| 941 | default: |
| 942 | cxgb3i_log_error("%s: close_rpl, TID %u in bad state %u\n", |
| 943 | c3cn->cdev->name, c3cn->tid, c3cn->state); |
| 944 | } |
| 945 | |
| 946 | out: |
| 947 | kfree_skb(skb); |
| 948 | } |
| 949 | |
| 950 | static int do_close_con_rpl(struct t3cdev *cdev, struct sk_buff *skb, |
| 951 | void *ctx) |
| 952 | { |
| 953 | struct s3_conn *c3cn = ctx; |
| 954 | |
| 955 | c3cn_conn_debug("rcv, c3cn 0x%p, s %u, f 0x%lx.\n", |
| 956 | c3cn, c3cn->state, c3cn->flags); |
| 957 | |
| 958 | process_cpl_msg_ref(process_close_con_rpl, c3cn, skb); |
| 959 | return 0; |
| 960 | } |
| 961 | |
| 962 | /* |
| 963 | * Process ABORT_REQ_RSS CPL message: -> host |
| 964 | * Process abort requests. If we are waiting for an ABORT_RPL we ignore this |
| 965 | * request except that we need to reply to it. |
| 966 | */ |
| 967 | |
| 968 | static int abort_status_to_errno(struct s3_conn *c3cn, int abort_reason, |
| 969 | int *need_rst) |
| 970 | { |
| 971 | switch (abort_reason) { |
| 972 | case CPL_ERR_BAD_SYN: /* fall through */ |
| 973 | case CPL_ERR_CONN_RESET: |
| 974 | return c3cn->state > C3CN_STATE_ESTABLISHED ? |
kxie@chelsio.com | 0109abf | 2009-12-09 21:25:36 -0800 | [diff] [blame] | 975 | -EPIPE : -ECONNRESET; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 976 | case CPL_ERR_XMIT_TIMEDOUT: |
| 977 | case CPL_ERR_PERSIST_TIMEDOUT: |
| 978 | case CPL_ERR_FINWAIT2_TIMEDOUT: |
| 979 | case CPL_ERR_KEEPALIVE_TIMEDOUT: |
kxie@chelsio.com | 0109abf | 2009-12-09 21:25:36 -0800 | [diff] [blame] | 980 | return -ETIMEDOUT; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 981 | default: |
kxie@chelsio.com | 0109abf | 2009-12-09 21:25:36 -0800 | [diff] [blame] | 982 | return -EIO; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 983 | } |
| 984 | } |
| 985 | |
| 986 | static void process_abort_req(struct s3_conn *c3cn, struct sk_buff *skb) |
| 987 | { |
| 988 | int rst_status = CPL_ABORT_NO_RST; |
| 989 | const struct cpl_abort_req_rss *req = cplhdr(skb); |
| 990 | |
| 991 | c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", |
| 992 | c3cn, c3cn->state, c3cn->flags); |
| 993 | |
| 994 | if (!c3cn_flag(c3cn, C3CN_ABORT_REQ_RCVD)) { |
| 995 | c3cn_set_flag(c3cn, C3CN_ABORT_REQ_RCVD); |
| 996 | c3cn_set_state(c3cn, C3CN_STATE_ABORTING); |
| 997 | __kfree_skb(skb); |
| 998 | return; |
| 999 | } |
| 1000 | |
| 1001 | c3cn_clear_flag(c3cn, C3CN_ABORT_REQ_RCVD); |
| 1002 | send_abort_rpl(c3cn, rst_status); |
| 1003 | |
| 1004 | if (!c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) { |
| 1005 | c3cn->err = |
| 1006 | abort_status_to_errno(c3cn, req->status, &rst_status); |
| 1007 | c3cn_closed(c3cn); |
| 1008 | } |
| 1009 | } |
| 1010 | |
| 1011 | static int do_abort_req(struct t3cdev *cdev, struct sk_buff *skb, void *ctx) |
| 1012 | { |
| 1013 | const struct cpl_abort_req_rss *req = cplhdr(skb); |
| 1014 | struct s3_conn *c3cn = ctx; |
| 1015 | |
| 1016 | c3cn_conn_debug("rcv, c3cn 0x%p, s 0x%x, f 0x%lx.\n", |
| 1017 | c3cn, c3cn->state, c3cn->flags); |
| 1018 | |
| 1019 | if (req->status == CPL_ERR_RTX_NEG_ADVICE || |
| 1020 | req->status == CPL_ERR_PERSIST_NEG_ADVICE) { |
| 1021 | __kfree_skb(skb); |
| 1022 | return 0; |
| 1023 | } |
| 1024 | |
| 1025 | process_cpl_msg_ref(process_abort_req, c3cn, skb); |
| 1026 | return 0; |
| 1027 | } |
| 1028 | |
| 1029 | /* |
| 1030 | * Process ABORT_RPL_RSS CPL message: -> host |
| 1031 | * Process abort replies. We only process these messages if we anticipate |
| 1032 | * them as the coordination between SW and HW in this area is somewhat lacking |
| 1033 | * and sometimes we get ABORT_RPLs after we are done with the connection that |
| 1034 | * originated the ABORT_REQ. |
| 1035 | */ |
| 1036 | static void process_abort_rpl(struct s3_conn *c3cn, struct sk_buff *skb) |
| 1037 | { |
| 1038 | c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", |
| 1039 | c3cn, c3cn->state, c3cn->flags); |
| 1040 | |
| 1041 | if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) { |
| 1042 | if (!c3cn_flag(c3cn, C3CN_ABORT_RPL_RCVD)) |
| 1043 | c3cn_set_flag(c3cn, C3CN_ABORT_RPL_RCVD); |
| 1044 | else { |
| 1045 | c3cn_clear_flag(c3cn, C3CN_ABORT_RPL_RCVD); |
| 1046 | c3cn_clear_flag(c3cn, C3CN_ABORT_RPL_PENDING); |
| 1047 | if (c3cn_flag(c3cn, C3CN_ABORT_REQ_RCVD)) |
| 1048 | cxgb3i_log_error("%s tid %u, ABORT_RPL_RSS\n", |
| 1049 | c3cn->cdev->name, c3cn->tid); |
| 1050 | c3cn_closed(c3cn); |
| 1051 | } |
| 1052 | } |
| 1053 | __kfree_skb(skb); |
| 1054 | } |
| 1055 | |
| 1056 | static int do_abort_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx) |
| 1057 | { |
| 1058 | struct cpl_abort_rpl_rss *rpl = cplhdr(skb); |
| 1059 | struct s3_conn *c3cn = ctx; |
| 1060 | |
| 1061 | c3cn_conn_debug("rcv, status 0x%x, c3cn 0x%p, s %u, 0x%lx.\n", |
| 1062 | rpl->status, c3cn, c3cn ? c3cn->state : 0, |
| 1063 | c3cn ? c3cn->flags : 0UL); |
| 1064 | |
| 1065 | /* |
| 1066 | * Ignore replies to post-close aborts indicating that the abort was |
| 1067 | * requested too late. These connections are terminated when we get |
| 1068 | * PEER_CLOSE or CLOSE_CON_RPL and by the time the abort_rpl_rss |
| 1069 | * arrives the TID is either no longer used or it has been recycled. |
| 1070 | */ |
| 1071 | if (rpl->status == CPL_ERR_ABORT_FAILED) |
| 1072 | goto discard; |
| 1073 | |
| 1074 | /* |
| 1075 | * Sometimes we've already closed the connection, e.g., a post-close |
| 1076 | * abort races with ABORT_REQ_RSS, the latter frees the connection |
| 1077 | * expecting the ABORT_REQ will fail with CPL_ERR_ABORT_FAILED, |
| 1078 | * but FW turns the ABORT_REQ into a regular one and so we get |
| 1079 | * ABORT_RPL_RSS with status 0 and no connection. |
| 1080 | */ |
| 1081 | if (!c3cn) |
| 1082 | goto discard; |
| 1083 | |
| 1084 | process_cpl_msg_ref(process_abort_rpl, c3cn, skb); |
| 1085 | return 0; |
| 1086 | |
| 1087 | discard: |
| 1088 | __kfree_skb(skb); |
| 1089 | return 0; |
| 1090 | } |
| 1091 | |
| 1092 | /* |
| 1093 | * Process RX_ISCSI_HDR CPL message: -> host |
| 1094 | * Handle received PDUs, the payload could be DDP'ed. If not, the payload |
| 1095 | * follow after the bhs. |
| 1096 | */ |
| 1097 | static void process_rx_iscsi_hdr(struct s3_conn *c3cn, struct sk_buff *skb) |
| 1098 | { |
| 1099 | struct cpl_iscsi_hdr *hdr_cpl = cplhdr(skb); |
| 1100 | struct cpl_iscsi_hdr_norss data_cpl; |
| 1101 | struct cpl_rx_data_ddp_norss ddp_cpl; |
| 1102 | unsigned int hdr_len, data_len, status; |
| 1103 | unsigned int len; |
| 1104 | int err; |
| 1105 | |
| 1106 | if (unlikely(c3cn->state >= C3CN_STATE_PASSIVE_CLOSE)) { |
| 1107 | if (c3cn->state != C3CN_STATE_ABORTING) |
| 1108 | send_abort_req(c3cn); |
| 1109 | __kfree_skb(skb); |
| 1110 | return; |
| 1111 | } |
| 1112 | |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 1113 | skb_tcp_seq(skb) = ntohl(hdr_cpl->seq); |
| 1114 | skb_flags(skb) = 0; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1115 | |
| 1116 | skb_reset_transport_header(skb); |
| 1117 | __skb_pull(skb, sizeof(struct cpl_iscsi_hdr)); |
| 1118 | |
| 1119 | len = hdr_len = ntohs(hdr_cpl->len); |
| 1120 | /* msg coalesce is off or not enough data received */ |
| 1121 | if (skb->len <= hdr_len) { |
| 1122 | cxgb3i_log_error("%s: TID %u, ISCSI_HDR, skb len %u < %u.\n", |
| 1123 | c3cn->cdev->name, c3cn->tid, |
| 1124 | skb->len, hdr_len); |
| 1125 | goto abort_conn; |
| 1126 | } |
| 1127 | |
| 1128 | err = skb_copy_bits(skb, skb->len - sizeof(ddp_cpl), &ddp_cpl, |
| 1129 | sizeof(ddp_cpl)); |
| 1130 | if (err < 0) |
| 1131 | goto abort_conn; |
| 1132 | |
| 1133 | skb_ulp_mode(skb) = ULP2_FLAG_DATA_READY; |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 1134 | skb_rx_pdulen(skb) = ntohs(ddp_cpl.len); |
| 1135 | skb_rx_ddigest(skb) = ntohl(ddp_cpl.ulp_crc); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1136 | status = ntohl(ddp_cpl.ddp_status); |
| 1137 | |
| 1138 | c3cn_rx_debug("rx skb 0x%p, len %u, pdulen %u, ddp status 0x%x.\n", |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 1139 | skb, skb->len, skb_rx_pdulen(skb), status); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1140 | |
| 1141 | if (status & (1 << RX_DDP_STATUS_HCRC_SHIFT)) |
| 1142 | skb_ulp_mode(skb) |= ULP2_FLAG_HCRC_ERROR; |
| 1143 | if (status & (1 << RX_DDP_STATUS_DCRC_SHIFT)) |
| 1144 | skb_ulp_mode(skb) |= ULP2_FLAG_DCRC_ERROR; |
| 1145 | if (status & (1 << RX_DDP_STATUS_PAD_SHIFT)) |
| 1146 | skb_ulp_mode(skb) |= ULP2_FLAG_PAD_ERROR; |
| 1147 | |
| 1148 | if (skb->len > (hdr_len + sizeof(ddp_cpl))) { |
| 1149 | err = skb_copy_bits(skb, hdr_len, &data_cpl, sizeof(data_cpl)); |
| 1150 | if (err < 0) |
| 1151 | goto abort_conn; |
| 1152 | data_len = ntohs(data_cpl.len); |
| 1153 | len += sizeof(data_cpl) + data_len; |
| 1154 | } else if (status & (1 << RX_DDP_STATUS_DDP_SHIFT)) |
| 1155 | skb_ulp_mode(skb) |= ULP2_FLAG_DATA_DDPED; |
| 1156 | |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 1157 | c3cn->rcv_nxt = ntohl(ddp_cpl.seq) + skb_rx_pdulen(skb); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1158 | __pskb_trim(skb, len); |
| 1159 | __skb_queue_tail(&c3cn->receive_queue, skb); |
| 1160 | cxgb3i_conn_pdu_ready(c3cn); |
| 1161 | |
| 1162 | return; |
| 1163 | |
| 1164 | abort_conn: |
| 1165 | send_abort_req(c3cn); |
| 1166 | __kfree_skb(skb); |
| 1167 | } |
| 1168 | |
| 1169 | static int do_iscsi_hdr(struct t3cdev *t3dev, struct sk_buff *skb, void *ctx) |
| 1170 | { |
| 1171 | struct s3_conn *c3cn = ctx; |
| 1172 | |
| 1173 | process_cpl_msg(process_rx_iscsi_hdr, c3cn, skb); |
| 1174 | return 0; |
| 1175 | } |
| 1176 | |
| 1177 | /* |
| 1178 | * Process TX_DATA_ACK CPL messages: -> host |
| 1179 | * Process an acknowledgment of WR completion. Advance snd_una and send the |
| 1180 | * next batch of work requests from the write queue. |
| 1181 | */ |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 1182 | static void check_wr_invariants(struct s3_conn *c3cn) |
| 1183 | { |
| 1184 | int pending = count_pending_wrs(c3cn); |
| 1185 | |
| 1186 | if (unlikely(c3cn->wr_avail + pending != c3cn->wr_max)) |
| 1187 | cxgb3i_log_error("TID %u: credit imbalance: avail %u, " |
| 1188 | "pending %u, total should be %u\n", |
| 1189 | c3cn->tid, c3cn->wr_avail, pending, |
| 1190 | c3cn->wr_max); |
| 1191 | } |
| 1192 | |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1193 | static void process_wr_ack(struct s3_conn *c3cn, struct sk_buff *skb) |
| 1194 | { |
| 1195 | struct cpl_wr_ack *hdr = cplhdr(skb); |
| 1196 | unsigned int credits = ntohs(hdr->credits); |
| 1197 | u32 snd_una = ntohl(hdr->snd_una); |
| 1198 | |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 1199 | c3cn_tx_debug("%u WR credits, avail %u, unack %u, TID %u, state %u.\n", |
| 1200 | credits, c3cn->wr_avail, c3cn->wr_unacked, |
| 1201 | c3cn->tid, c3cn->state); |
| 1202 | |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1203 | c3cn->wr_avail += credits; |
| 1204 | if (c3cn->wr_unacked > c3cn->wr_max - c3cn->wr_avail) |
| 1205 | c3cn->wr_unacked = c3cn->wr_max - c3cn->wr_avail; |
| 1206 | |
| 1207 | while (credits) { |
| 1208 | struct sk_buff *p = peek_wr(c3cn); |
| 1209 | |
| 1210 | if (unlikely(!p)) { |
| 1211 | cxgb3i_log_error("%u WR_ACK credits for TID %u with " |
| 1212 | "nothing pending, state %u\n", |
| 1213 | credits, c3cn->tid, c3cn->state); |
| 1214 | break; |
| 1215 | } |
| 1216 | if (unlikely(credits < p->csum)) { |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 1217 | struct tx_data_wr *w = cplhdr(p); |
| 1218 | cxgb3i_log_error("TID %u got %u WR credits need %u, " |
| 1219 | "len %u, main body %u, frags %u, " |
| 1220 | "seq # %u, ACK una %u, ACK nxt %u, " |
| 1221 | "WR_AVAIL %u, WRs pending %u\n", |
| 1222 | c3cn->tid, credits, p->csum, p->len, |
| 1223 | p->len - p->data_len, |
| 1224 | skb_shinfo(p)->nr_frags, |
| 1225 | ntohl(w->sndseq), snd_una, |
| 1226 | ntohl(hdr->snd_nxt), c3cn->wr_avail, |
| 1227 | count_pending_wrs(c3cn) - credits); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1228 | p->csum -= credits; |
| 1229 | break; |
| 1230 | } else { |
| 1231 | dequeue_wr(c3cn); |
| 1232 | credits -= p->csum; |
| 1233 | free_wr_skb(p); |
| 1234 | } |
| 1235 | } |
| 1236 | |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 1237 | check_wr_invariants(c3cn); |
| 1238 | |
| 1239 | if (unlikely(before(snd_una, c3cn->snd_una))) { |
| 1240 | cxgb3i_log_error("TID %u, unexpected sequence # %u in WR_ACK " |
| 1241 | "snd_una %u\n", |
| 1242 | c3cn->tid, snd_una, c3cn->snd_una); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1243 | goto out_free; |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 1244 | } |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1245 | |
| 1246 | if (c3cn->snd_una != snd_una) { |
| 1247 | c3cn->snd_una = snd_una; |
| 1248 | dst_confirm(c3cn->dst_cache); |
| 1249 | } |
| 1250 | |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 1251 | if (skb_queue_len(&c3cn->write_queue)) { |
| 1252 | if (c3cn_push_tx_frames(c3cn, 0)) |
| 1253 | cxgb3i_conn_tx_open(c3cn); |
| 1254 | } else |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1255 | cxgb3i_conn_tx_open(c3cn); |
| 1256 | out_free: |
| 1257 | __kfree_skb(skb); |
| 1258 | } |
| 1259 | |
| 1260 | static int do_wr_ack(struct t3cdev *cdev, struct sk_buff *skb, void *ctx) |
| 1261 | { |
| 1262 | struct s3_conn *c3cn = ctx; |
| 1263 | |
| 1264 | process_cpl_msg(process_wr_ack, c3cn, skb); |
| 1265 | return 0; |
| 1266 | } |
| 1267 | |
| 1268 | /* |
| 1269 | * for each connection, pre-allocate skbs needed for close/abort requests. So |
| 1270 | * that we can service the request right away. |
| 1271 | */ |
| 1272 | static void c3cn_free_cpl_skbs(struct s3_conn *c3cn) |
| 1273 | { |
| 1274 | if (c3cn->cpl_close) |
| 1275 | kfree_skb(c3cn->cpl_close); |
| 1276 | if (c3cn->cpl_abort_req) |
| 1277 | kfree_skb(c3cn->cpl_abort_req); |
| 1278 | if (c3cn->cpl_abort_rpl) |
| 1279 | kfree_skb(c3cn->cpl_abort_rpl); |
| 1280 | } |
| 1281 | |
| 1282 | static int c3cn_alloc_cpl_skbs(struct s3_conn *c3cn) |
| 1283 | { |
| 1284 | c3cn->cpl_close = alloc_skb(sizeof(struct cpl_close_con_req), |
| 1285 | GFP_KERNEL); |
| 1286 | if (!c3cn->cpl_close) |
| 1287 | return -ENOMEM; |
| 1288 | skb_put(c3cn->cpl_close, sizeof(struct cpl_close_con_req)); |
| 1289 | |
| 1290 | c3cn->cpl_abort_req = alloc_skb(sizeof(struct cpl_abort_req), |
| 1291 | GFP_KERNEL); |
| 1292 | if (!c3cn->cpl_abort_req) |
| 1293 | goto free_cpl_skbs; |
| 1294 | skb_put(c3cn->cpl_abort_req, sizeof(struct cpl_abort_req)); |
| 1295 | |
| 1296 | c3cn->cpl_abort_rpl = alloc_skb(sizeof(struct cpl_abort_rpl), |
| 1297 | GFP_KERNEL); |
| 1298 | if (!c3cn->cpl_abort_rpl) |
| 1299 | goto free_cpl_skbs; |
| 1300 | skb_put(c3cn->cpl_abort_rpl, sizeof(struct cpl_abort_rpl)); |
| 1301 | |
| 1302 | return 0; |
| 1303 | |
| 1304 | free_cpl_skbs: |
| 1305 | c3cn_free_cpl_skbs(c3cn); |
| 1306 | return -ENOMEM; |
| 1307 | } |
| 1308 | |
| 1309 | /** |
| 1310 | * c3cn_release_offload_resources - release offload resource |
| 1311 | * @c3cn: the offloaded iscsi tcp connection. |
| 1312 | * Release resources held by an offload connection (TID, L2T entry, etc.) |
| 1313 | */ |
| 1314 | static void c3cn_release_offload_resources(struct s3_conn *c3cn) |
| 1315 | { |
| 1316 | struct t3cdev *cdev = c3cn->cdev; |
| 1317 | unsigned int tid = c3cn->tid; |
| 1318 | |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1319 | c3cn->qset = 0; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1320 | c3cn_free_cpl_skbs(c3cn); |
| 1321 | |
| 1322 | if (c3cn->wr_avail != c3cn->wr_max) { |
| 1323 | purge_wr_queue(c3cn); |
| 1324 | reset_wr_list(c3cn); |
| 1325 | } |
| 1326 | |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 1327 | if (cdev) { |
| 1328 | if (c3cn->l2t) { |
| 1329 | l2t_release(L2DATA(cdev), c3cn->l2t); |
| 1330 | c3cn->l2t = NULL; |
| 1331 | } |
| 1332 | if (c3cn->state == C3CN_STATE_CONNECTING) |
| 1333 | /* we have ATID */ |
| 1334 | s3_free_atid(cdev, tid); |
| 1335 | else { |
| 1336 | /* we have TID */ |
| 1337 | cxgb3_remove_tid(cdev, (void *)c3cn, tid); |
| 1338 | c3cn_put(c3cn); |
| 1339 | } |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1340 | } |
| 1341 | |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 1342 | c3cn->dst_cache = NULL; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1343 | c3cn->cdev = NULL; |
| 1344 | } |
| 1345 | |
| 1346 | /** |
| 1347 | * cxgb3i_c3cn_create - allocate and initialize an s3_conn structure |
| 1348 | * returns the s3_conn structure allocated. |
| 1349 | */ |
| 1350 | struct s3_conn *cxgb3i_c3cn_create(void) |
| 1351 | { |
| 1352 | struct s3_conn *c3cn; |
| 1353 | |
| 1354 | c3cn = kzalloc(sizeof(*c3cn), GFP_KERNEL); |
| 1355 | if (!c3cn) |
| 1356 | return NULL; |
| 1357 | |
| 1358 | /* pre-allocate close/abort cpl, so we don't need to wait for memory |
| 1359 | when close/abort is requested. */ |
| 1360 | if (c3cn_alloc_cpl_skbs(c3cn) < 0) |
| 1361 | goto free_c3cn; |
| 1362 | |
| 1363 | c3cn_conn_debug("alloc c3cn 0x%p.\n", c3cn); |
| 1364 | |
| 1365 | c3cn->flags = 0; |
| 1366 | spin_lock_init(&c3cn->lock); |
| 1367 | atomic_set(&c3cn->refcnt, 1); |
| 1368 | skb_queue_head_init(&c3cn->receive_queue); |
| 1369 | skb_queue_head_init(&c3cn->write_queue); |
| 1370 | setup_timer(&c3cn->retry_timer, NULL, (unsigned long)c3cn); |
| 1371 | rwlock_init(&c3cn->callback_lock); |
| 1372 | |
| 1373 | return c3cn; |
| 1374 | |
| 1375 | free_c3cn: |
| 1376 | kfree(c3cn); |
| 1377 | return NULL; |
| 1378 | } |
| 1379 | |
| 1380 | static void c3cn_active_close(struct s3_conn *c3cn) |
| 1381 | { |
| 1382 | int data_lost; |
| 1383 | int close_req = 0; |
| 1384 | |
| 1385 | c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", |
| 1386 | c3cn, c3cn->state, c3cn->flags); |
| 1387 | |
| 1388 | dst_confirm(c3cn->dst_cache); |
| 1389 | |
| 1390 | c3cn_hold(c3cn); |
| 1391 | spin_lock_bh(&c3cn->lock); |
| 1392 | |
| 1393 | data_lost = skb_queue_len(&c3cn->receive_queue); |
| 1394 | __skb_queue_purge(&c3cn->receive_queue); |
| 1395 | |
| 1396 | switch (c3cn->state) { |
| 1397 | case C3CN_STATE_CLOSED: |
| 1398 | case C3CN_STATE_ACTIVE_CLOSE: |
| 1399 | case C3CN_STATE_CLOSE_WAIT_1: |
| 1400 | case C3CN_STATE_CLOSE_WAIT_2: |
| 1401 | case C3CN_STATE_ABORTING: |
| 1402 | /* nothing need to be done */ |
| 1403 | break; |
| 1404 | case C3CN_STATE_CONNECTING: |
| 1405 | /* defer until cpl_act_open_rpl or cpl_act_establish */ |
| 1406 | c3cn_set_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED); |
| 1407 | break; |
| 1408 | case C3CN_STATE_ESTABLISHED: |
| 1409 | close_req = 1; |
| 1410 | c3cn_set_state(c3cn, C3CN_STATE_ACTIVE_CLOSE); |
| 1411 | break; |
| 1412 | case C3CN_STATE_PASSIVE_CLOSE: |
| 1413 | close_req = 1; |
| 1414 | c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_2); |
| 1415 | break; |
| 1416 | } |
| 1417 | |
| 1418 | if (close_req) { |
| 1419 | if (data_lost) |
| 1420 | /* Unread data was tossed, zap the connection. */ |
| 1421 | send_abort_req(c3cn); |
| 1422 | else |
| 1423 | send_close_req(c3cn); |
| 1424 | } |
| 1425 | |
| 1426 | spin_unlock_bh(&c3cn->lock); |
| 1427 | c3cn_put(c3cn); |
| 1428 | } |
| 1429 | |
| 1430 | /** |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 1431 | * cxgb3i_c3cn_release - close and release an iscsi tcp connection and any |
| 1432 | * resource held |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1433 | * @c3cn: the iscsi tcp connection |
| 1434 | */ |
| 1435 | void cxgb3i_c3cn_release(struct s3_conn *c3cn) |
| 1436 | { |
| 1437 | c3cn_conn_debug("c3cn 0x%p, s %u, f 0x%lx.\n", |
| 1438 | c3cn, c3cn->state, c3cn->flags); |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 1439 | if (unlikely(c3cn->state == C3CN_STATE_CONNECTING)) |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1440 | c3cn_set_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED); |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 1441 | else if (likely(c3cn->state != C3CN_STATE_CLOSED)) |
| 1442 | c3cn_active_close(c3cn); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1443 | c3cn_put(c3cn); |
| 1444 | } |
| 1445 | |
| 1446 | static int is_cxgb3_dev(struct net_device *dev) |
| 1447 | { |
| 1448 | struct cxgb3i_sdev_data *cdata; |
Rakesh Ranjan | 44214ab | 2009-12-15 12:19:19 +0530 | [diff] [blame] | 1449 | struct net_device *ndev = dev; |
| 1450 | |
| 1451 | if (dev->priv_flags & IFF_802_1Q_VLAN) |
| 1452 | ndev = vlan_dev_real_dev(dev); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1453 | |
| 1454 | write_lock(&cdata_rwlock); |
| 1455 | list_for_each_entry(cdata, &cdata_list, list) { |
| 1456 | struct adap_ports *ports = &cdata->ports; |
| 1457 | int i; |
| 1458 | |
| 1459 | for (i = 0; i < ports->nports; i++) |
Rakesh Ranjan | 44214ab | 2009-12-15 12:19:19 +0530 | [diff] [blame] | 1460 | if (ndev == ports->lldevs[i]) { |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1461 | write_unlock(&cdata_rwlock); |
| 1462 | return 1; |
| 1463 | } |
| 1464 | } |
| 1465 | write_unlock(&cdata_rwlock); |
| 1466 | return 0; |
| 1467 | } |
| 1468 | |
| 1469 | /** |
| 1470 | * cxgb3_egress_dev - return the cxgb3 egress device |
| 1471 | * @root_dev: the root device anchoring the search |
| 1472 | * @c3cn: the connection used to determine egress port in bonding mode |
| 1473 | * @context: in bonding mode, indicates a connection set up or failover |
| 1474 | * |
| 1475 | * Return egress device or NULL if the egress device isn't one of our ports. |
| 1476 | */ |
| 1477 | static struct net_device *cxgb3_egress_dev(struct net_device *root_dev, |
| 1478 | struct s3_conn *c3cn, |
| 1479 | int context) |
| 1480 | { |
| 1481 | while (root_dev) { |
| 1482 | if (root_dev->priv_flags & IFF_802_1Q_VLAN) |
| 1483 | root_dev = vlan_dev_real_dev(root_dev); |
| 1484 | else if (is_cxgb3_dev(root_dev)) |
| 1485 | return root_dev; |
| 1486 | else |
| 1487 | return NULL; |
| 1488 | } |
| 1489 | return NULL; |
| 1490 | } |
| 1491 | |
Mike Christie | 10eb0f0 | 2009-05-13 17:57:38 -0500 | [diff] [blame] | 1492 | static struct rtable *find_route(struct net_device *dev, |
| 1493 | __be32 saddr, __be32 daddr, |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1494 | __be16 sport, __be16 dport) |
| 1495 | { |
| 1496 | struct rtable *rt; |
| 1497 | struct flowi fl = { |
Mike Christie | 10eb0f0 | 2009-05-13 17:57:38 -0500 | [diff] [blame] | 1498 | .oif = dev ? dev->ifindex : 0, |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1499 | .nl_u = { |
| 1500 | .ip4_u = { |
| 1501 | .daddr = daddr, |
| 1502 | .saddr = saddr, |
| 1503 | .tos = 0 } }, |
| 1504 | .proto = IPPROTO_TCP, |
| 1505 | .uli_u = { |
| 1506 | .ports = { |
| 1507 | .sport = sport, |
| 1508 | .dport = dport } } }; |
| 1509 | |
| 1510 | if (ip_route_output_flow(&init_net, &rt, &fl, NULL, 0)) |
| 1511 | return NULL; |
| 1512 | return rt; |
| 1513 | } |
| 1514 | |
| 1515 | /* |
| 1516 | * Assign offload parameters to some connection fields. |
| 1517 | */ |
| 1518 | static void init_offload_conn(struct s3_conn *c3cn, |
| 1519 | struct t3cdev *cdev, |
| 1520 | struct dst_entry *dst) |
| 1521 | { |
| 1522 | BUG_ON(c3cn->cdev != cdev); |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 1523 | c3cn->wr_max = c3cn->wr_avail = T3C_DATA(cdev)->max_wrs - 1; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1524 | c3cn->wr_unacked = 0; |
| 1525 | c3cn->mss_idx = select_mss(c3cn, dst_mtu(dst)); |
| 1526 | |
| 1527 | reset_wr_list(c3cn); |
| 1528 | } |
| 1529 | |
| 1530 | static int initiate_act_open(struct s3_conn *c3cn, struct net_device *dev) |
| 1531 | { |
| 1532 | struct cxgb3i_sdev_data *cdata = NDEV2CDATA(dev); |
| 1533 | struct t3cdev *cdev = cdata->cdev; |
| 1534 | struct dst_entry *dst = c3cn->dst_cache; |
| 1535 | struct sk_buff *skb; |
| 1536 | |
| 1537 | c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", |
| 1538 | c3cn, c3cn->state, c3cn->flags); |
| 1539 | /* |
| 1540 | * Initialize connection data. Note that the flags and ULP mode are |
| 1541 | * initialized higher up ... |
| 1542 | */ |
| 1543 | c3cn->dev = dev; |
| 1544 | c3cn->cdev = cdev; |
| 1545 | c3cn->tid = cxgb3_alloc_atid(cdev, cdata->client, c3cn); |
| 1546 | if (c3cn->tid < 0) |
| 1547 | goto out_err; |
| 1548 | |
| 1549 | c3cn->qset = 0; |
| 1550 | c3cn->l2t = t3_l2t_get(cdev, dst->neighbour, dev); |
| 1551 | if (!c3cn->l2t) |
| 1552 | goto free_tid; |
| 1553 | |
| 1554 | skb = alloc_skb(sizeof(struct cpl_act_open_req), GFP_KERNEL); |
| 1555 | if (!skb) |
| 1556 | goto free_l2t; |
| 1557 | |
| 1558 | skb->sk = (struct sock *)c3cn; |
| 1559 | set_arp_failure_handler(skb, act_open_req_arp_failure); |
| 1560 | |
| 1561 | c3cn_hold(c3cn); |
| 1562 | |
| 1563 | init_offload_conn(c3cn, cdev, dst); |
| 1564 | c3cn->err = 0; |
| 1565 | |
| 1566 | make_act_open_req(c3cn, skb, c3cn->tid, c3cn->l2t); |
| 1567 | l2t_send(cdev, skb, c3cn->l2t); |
| 1568 | return 0; |
| 1569 | |
| 1570 | free_l2t: |
| 1571 | l2t_release(L2DATA(cdev), c3cn->l2t); |
| 1572 | free_tid: |
| 1573 | s3_free_atid(cdev, c3cn->tid); |
| 1574 | c3cn->tid = 0; |
| 1575 | out_err: |
kxie@chelsio.com | 0109abf | 2009-12-09 21:25:36 -0800 | [diff] [blame] | 1576 | return -EINVAL; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1577 | } |
| 1578 | |
Rakesh Ranjan | 44214ab | 2009-12-15 12:19:19 +0530 | [diff] [blame] | 1579 | /** |
| 1580 | * cxgb3i_find_dev - find the interface associated with the given address |
| 1581 | * @ipaddr: ip address |
| 1582 | */ |
| 1583 | static struct net_device * |
| 1584 | cxgb3i_find_dev(struct net_device *dev, __be32 ipaddr) |
| 1585 | { |
| 1586 | struct flowi fl; |
| 1587 | int err; |
| 1588 | struct rtable *rt; |
| 1589 | |
| 1590 | memset(&fl, 0, sizeof(fl)); |
| 1591 | fl.nl_u.ip4_u.daddr = ipaddr; |
| 1592 | |
| 1593 | err = ip_route_output_key(dev ? dev_net(dev) : &init_net, &rt, &fl); |
| 1594 | if (!err) |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1595 | return (&rt->dst)->dev; |
Rakesh Ranjan | 44214ab | 2009-12-15 12:19:19 +0530 | [diff] [blame] | 1596 | |
| 1597 | return NULL; |
| 1598 | } |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1599 | |
| 1600 | /** |
| 1601 | * cxgb3i_c3cn_connect - initiates an iscsi tcp connection to a given address |
| 1602 | * @c3cn: the iscsi tcp connection |
| 1603 | * @usin: destination address |
| 1604 | * |
| 1605 | * return 0 if active open request is sent, < 0 otherwise. |
| 1606 | */ |
Mike Christie | 10eb0f0 | 2009-05-13 17:57:38 -0500 | [diff] [blame] | 1607 | int cxgb3i_c3cn_connect(struct net_device *dev, struct s3_conn *c3cn, |
| 1608 | struct sockaddr_in *usin) |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1609 | { |
| 1610 | struct rtable *rt; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1611 | struct cxgb3i_sdev_data *cdata; |
| 1612 | struct t3cdev *cdev; |
| 1613 | __be32 sipv4; |
Rakesh Ranjan | 44214ab | 2009-12-15 12:19:19 +0530 | [diff] [blame] | 1614 | struct net_device *dstdev; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1615 | int err; |
| 1616 | |
Mike Christie | 10eb0f0 | 2009-05-13 17:57:38 -0500 | [diff] [blame] | 1617 | c3cn_conn_debug("c3cn 0x%p, dev 0x%p.\n", c3cn, dev); |
| 1618 | |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1619 | if (usin->sin_family != AF_INET) |
| 1620 | return -EAFNOSUPPORT; |
| 1621 | |
| 1622 | c3cn->daddr.sin_port = usin->sin_port; |
| 1623 | c3cn->daddr.sin_addr.s_addr = usin->sin_addr.s_addr; |
| 1624 | |
Rakesh Ranjan | 44214ab | 2009-12-15 12:19:19 +0530 | [diff] [blame] | 1625 | dstdev = cxgb3i_find_dev(dev, usin->sin_addr.s_addr); |
| 1626 | if (!dstdev || !is_cxgb3_dev(dstdev)) |
| 1627 | return -ENETUNREACH; |
| 1628 | |
| 1629 | if (dstdev->priv_flags & IFF_802_1Q_VLAN) |
| 1630 | dev = dstdev; |
| 1631 | |
Mike Christie | 10eb0f0 | 2009-05-13 17:57:38 -0500 | [diff] [blame] | 1632 | rt = find_route(dev, c3cn->saddr.sin_addr.s_addr, |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1633 | c3cn->daddr.sin_addr.s_addr, |
| 1634 | c3cn->saddr.sin_port, |
| 1635 | c3cn->daddr.sin_port); |
| 1636 | if (rt == NULL) { |
Mike Christie | 10eb0f0 | 2009-05-13 17:57:38 -0500 | [diff] [blame] | 1637 | c3cn_conn_debug("NO route to 0x%x, port %u, dev %s.\n", |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1638 | c3cn->daddr.sin_addr.s_addr, |
Mike Christie | 10eb0f0 | 2009-05-13 17:57:38 -0500 | [diff] [blame] | 1639 | ntohs(c3cn->daddr.sin_port), |
| 1640 | dev ? dev->name : "any"); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1641 | return -ENETUNREACH; |
| 1642 | } |
| 1643 | |
| 1644 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { |
Mike Christie | 10eb0f0 | 2009-05-13 17:57:38 -0500 | [diff] [blame] | 1645 | c3cn_conn_debug("multi-cast route to 0x%x, port %u, dev %s.\n", |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1646 | c3cn->daddr.sin_addr.s_addr, |
Mike Christie | 10eb0f0 | 2009-05-13 17:57:38 -0500 | [diff] [blame] | 1647 | ntohs(c3cn->daddr.sin_port), |
| 1648 | dev ? dev->name : "any"); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1649 | ip_rt_put(rt); |
| 1650 | return -ENETUNREACH; |
| 1651 | } |
| 1652 | |
| 1653 | if (!c3cn->saddr.sin_addr.s_addr) |
| 1654 | c3cn->saddr.sin_addr.s_addr = rt->rt_src; |
| 1655 | |
| 1656 | /* now commit destination to connection */ |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1657 | c3cn->dst_cache = &rt->dst; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1658 | |
| 1659 | /* try to establish an offloaded connection */ |
| 1660 | dev = cxgb3_egress_dev(c3cn->dst_cache->dev, c3cn, 0); |
| 1661 | if (dev == NULL) { |
| 1662 | c3cn_conn_debug("c3cn 0x%p, egress dev NULL.\n", c3cn); |
| 1663 | return -ENETUNREACH; |
| 1664 | } |
| 1665 | cdata = NDEV2CDATA(dev); |
| 1666 | cdev = cdata->cdev; |
| 1667 | |
| 1668 | /* get a source port if one hasn't been provided */ |
| 1669 | err = c3cn_get_port(c3cn, cdata); |
| 1670 | if (err) |
| 1671 | return err; |
| 1672 | |
| 1673 | c3cn_conn_debug("c3cn 0x%p get port %u.\n", |
| 1674 | c3cn, ntohs(c3cn->saddr.sin_port)); |
| 1675 | |
| 1676 | sipv4 = cxgb3i_get_private_ipv4addr(dev); |
| 1677 | if (!sipv4) { |
| 1678 | c3cn_conn_debug("c3cn 0x%p, iscsi ip not configured.\n", c3cn); |
| 1679 | sipv4 = c3cn->saddr.sin_addr.s_addr; |
| 1680 | cxgb3i_set_private_ipv4addr(dev, sipv4); |
| 1681 | } else |
| 1682 | c3cn->saddr.sin_addr.s_addr = sipv4; |
| 1683 | |
Joe Perches | d9573e7 | 2010-02-10 16:51:43 -0600 | [diff] [blame] | 1684 | c3cn_conn_debug("c3cn 0x%p, %pI4,%u-%pI4,%u SYN_SENT.\n", |
| 1685 | c3cn, |
| 1686 | &c3cn->saddr.sin_addr.s_addr, |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1687 | ntohs(c3cn->saddr.sin_port), |
Joe Perches | d9573e7 | 2010-02-10 16:51:43 -0600 | [diff] [blame] | 1688 | &c3cn->daddr.sin_addr.s_addr, |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1689 | ntohs(c3cn->daddr.sin_port)); |
| 1690 | |
| 1691 | c3cn_set_state(c3cn, C3CN_STATE_CONNECTING); |
| 1692 | if (!initiate_act_open(c3cn, dev)) |
| 1693 | return 0; |
| 1694 | |
| 1695 | /* |
| 1696 | * If we get here, we don't have an offload connection so simply |
| 1697 | * return a failure. |
| 1698 | */ |
| 1699 | err = -ENOTSUPP; |
| 1700 | |
| 1701 | /* |
| 1702 | * This trashes the connection and releases the local port, |
| 1703 | * if necessary. |
| 1704 | */ |
| 1705 | c3cn_conn_debug("c3cn 0x%p -> CLOSED.\n", c3cn); |
| 1706 | c3cn_set_state(c3cn, C3CN_STATE_CLOSED); |
| 1707 | ip_rt_put(rt); |
| 1708 | c3cn_put_port(c3cn); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1709 | return err; |
| 1710 | } |
| 1711 | |
| 1712 | /** |
| 1713 | * cxgb3i_c3cn_rx_credits - ack received tcp data. |
| 1714 | * @c3cn: iscsi tcp connection |
| 1715 | * @copied: # of bytes processed |
| 1716 | * |
| 1717 | * Called after some received data has been read. It returns RX credits |
| 1718 | * to the HW for the amount of data processed. |
| 1719 | */ |
| 1720 | void cxgb3i_c3cn_rx_credits(struct s3_conn *c3cn, int copied) |
| 1721 | { |
| 1722 | struct t3cdev *cdev; |
| 1723 | int must_send; |
| 1724 | u32 credits, dack = 0; |
| 1725 | |
| 1726 | if (c3cn->state != C3CN_STATE_ESTABLISHED) |
| 1727 | return; |
| 1728 | |
| 1729 | credits = c3cn->copied_seq - c3cn->rcv_wup; |
| 1730 | if (unlikely(!credits)) |
| 1731 | return; |
| 1732 | |
| 1733 | cdev = c3cn->cdev; |
| 1734 | |
| 1735 | if (unlikely(cxgb3_rx_credit_thres == 0)) |
| 1736 | return; |
| 1737 | |
| 1738 | dack = F_RX_DACK_CHANGE | V_RX_DACK_MODE(1); |
| 1739 | |
| 1740 | /* |
| 1741 | * For coalescing to work effectively ensure the receive window has |
| 1742 | * at least 16KB left. |
| 1743 | */ |
| 1744 | must_send = credits + 16384 >= cxgb3_rcv_win; |
| 1745 | |
| 1746 | if (must_send || credits >= cxgb3_rx_credit_thres) |
| 1747 | c3cn->rcv_wup += send_rx_credits(c3cn, credits, dack); |
| 1748 | } |
| 1749 | |
| 1750 | /** |
| 1751 | * cxgb3i_c3cn_send_pdus - send the skbs containing iscsi pdus |
| 1752 | * @c3cn: iscsi tcp connection |
| 1753 | * @skb: skb contains the iscsi pdu |
| 1754 | * |
| 1755 | * Add a list of skbs to a connection send queue. The skbs must comply with |
| 1756 | * the max size limit of the device and have a headroom of at least |
| 1757 | * TX_HEADER_LEN bytes. |
| 1758 | * Return # of bytes queued. |
| 1759 | */ |
| 1760 | int cxgb3i_c3cn_send_pdus(struct s3_conn *c3cn, struct sk_buff *skb) |
| 1761 | { |
| 1762 | struct sk_buff *next; |
| 1763 | int err, copied = 0; |
| 1764 | |
| 1765 | spin_lock_bh(&c3cn->lock); |
| 1766 | |
| 1767 | if (c3cn->state != C3CN_STATE_ESTABLISHED) { |
| 1768 | c3cn_tx_debug("c3cn 0x%p, not in est. state %u.\n", |
| 1769 | c3cn, c3cn->state); |
| 1770 | err = -EAGAIN; |
| 1771 | goto out_err; |
| 1772 | } |
| 1773 | |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1774 | if (c3cn->err) { |
| 1775 | c3cn_tx_debug("c3cn 0x%p, err %d.\n", c3cn, c3cn->err); |
Karen Xie | 1648b11 | 2009-02-13 21:38:44 -0800 | [diff] [blame] | 1776 | err = -EPIPE; |
| 1777 | goto out_err; |
| 1778 | } |
| 1779 | |
| 1780 | if (c3cn->write_seq - c3cn->snd_una >= cxgb3_snd_win) { |
| 1781 | c3cn_tx_debug("c3cn 0x%p, snd %u - %u > %u.\n", |
| 1782 | c3cn, c3cn->write_seq, c3cn->snd_una, |
| 1783 | cxgb3_snd_win); |
Mike Christie | 1393109 | 2009-04-21 15:32:34 -0500 | [diff] [blame] | 1784 | err = -ENOBUFS; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1785 | goto out_err; |
| 1786 | } |
| 1787 | |
| 1788 | while (skb) { |
| 1789 | int frags = skb_shinfo(skb)->nr_frags + |
| 1790 | (skb->len != skb->data_len); |
| 1791 | |
| 1792 | if (unlikely(skb_headroom(skb) < TX_HEADER_LEN)) { |
| 1793 | c3cn_tx_debug("c3cn 0x%p, skb head.\n", c3cn); |
| 1794 | err = -EINVAL; |
| 1795 | goto out_err; |
| 1796 | } |
| 1797 | |
| 1798 | if (frags >= SKB_WR_LIST_SIZE) { |
| 1799 | cxgb3i_log_error("c3cn 0x%p, tx frags %d, len %u,%u.\n", |
| 1800 | c3cn, skb_shinfo(skb)->nr_frags, |
| 1801 | skb->len, skb->data_len); |
| 1802 | err = -EINVAL; |
| 1803 | goto out_err; |
| 1804 | } |
| 1805 | |
| 1806 | next = skb->next; |
| 1807 | skb->next = NULL; |
| 1808 | skb_entail(c3cn, skb, C3CB_FLAG_NO_APPEND | C3CB_FLAG_NEED_HDR); |
| 1809 | copied += skb->len; |
| 1810 | c3cn->write_seq += skb->len + ulp_extra_len(skb); |
| 1811 | skb = next; |
| 1812 | } |
| 1813 | done: |
| 1814 | if (likely(skb_queue_len(&c3cn->write_queue))) |
| 1815 | c3cn_push_tx_frames(c3cn, 1); |
| 1816 | spin_unlock_bh(&c3cn->lock); |
| 1817 | return copied; |
| 1818 | |
| 1819 | out_err: |
| 1820 | if (copied == 0 && err == -EPIPE) |
| 1821 | copied = c3cn->err ? c3cn->err : -EPIPE; |
Mike Christie | 1393109 | 2009-04-21 15:32:34 -0500 | [diff] [blame] | 1822 | else |
| 1823 | copied = err; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1824 | goto done; |
| 1825 | } |
| 1826 | |
| 1827 | static void sdev_data_cleanup(struct cxgb3i_sdev_data *cdata) |
| 1828 | { |
| 1829 | struct adap_ports *ports = &cdata->ports; |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 1830 | struct s3_conn *c3cn; |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1831 | int i; |
| 1832 | |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 1833 | for (i = 0; i < cxgb3_max_connect; i++) { |
| 1834 | if (cdata->sport_conn[i]) { |
| 1835 | c3cn = cdata->sport_conn[i]; |
| 1836 | cdata->sport_conn[i] = NULL; |
| 1837 | |
| 1838 | spin_lock_bh(&c3cn->lock); |
| 1839 | c3cn->cdev = NULL; |
| 1840 | c3cn_set_flag(c3cn, C3CN_OFFLOAD_DOWN); |
| 1841 | c3cn_closed(c3cn); |
| 1842 | spin_unlock_bh(&c3cn->lock); |
| 1843 | } |
| 1844 | } |
| 1845 | |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1846 | for (i = 0; i < ports->nports; i++) |
| 1847 | NDEV2CDATA(ports->lldevs[i]) = NULL; |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 1848 | |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1849 | cxgb3i_free_big_mem(cdata); |
| 1850 | } |
| 1851 | |
| 1852 | void cxgb3i_sdev_cleanup(void) |
| 1853 | { |
| 1854 | struct cxgb3i_sdev_data *cdata; |
| 1855 | |
| 1856 | write_lock(&cdata_rwlock); |
| 1857 | list_for_each_entry(cdata, &cdata_list, list) { |
| 1858 | list_del(&cdata->list); |
| 1859 | sdev_data_cleanup(cdata); |
| 1860 | } |
| 1861 | write_unlock(&cdata_rwlock); |
| 1862 | } |
| 1863 | |
| 1864 | int cxgb3i_sdev_init(cxgb3_cpl_handler_func *cpl_handlers) |
| 1865 | { |
| 1866 | cpl_handlers[CPL_ACT_ESTABLISH] = do_act_establish; |
| 1867 | cpl_handlers[CPL_ACT_OPEN_RPL] = do_act_open_rpl; |
| 1868 | cpl_handlers[CPL_PEER_CLOSE] = do_peer_close; |
| 1869 | cpl_handlers[CPL_ABORT_REQ_RSS] = do_abort_req; |
| 1870 | cpl_handlers[CPL_ABORT_RPL_RSS] = do_abort_rpl; |
| 1871 | cpl_handlers[CPL_CLOSE_CON_RPL] = do_close_con_rpl; |
| 1872 | cpl_handlers[CPL_TX_DMA_ACK] = do_wr_ack; |
| 1873 | cpl_handlers[CPL_ISCSI_HDR] = do_iscsi_hdr; |
| 1874 | |
| 1875 | if (cxgb3_max_connect > CXGB3I_MAX_CONN) |
| 1876 | cxgb3_max_connect = CXGB3I_MAX_CONN; |
| 1877 | return 0; |
| 1878 | } |
| 1879 | |
| 1880 | /** |
| 1881 | * cxgb3i_sdev_add - allocate and initialize resources for each adapter found |
| 1882 | * @cdev: t3cdev adapter |
| 1883 | * @client: cxgb3 driver client |
| 1884 | */ |
| 1885 | void cxgb3i_sdev_add(struct t3cdev *cdev, struct cxgb3_client *client) |
| 1886 | { |
| 1887 | struct cxgb3i_sdev_data *cdata; |
| 1888 | struct ofld_page_info rx_page_info; |
| 1889 | unsigned int wr_len; |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 1890 | int mapsize = cxgb3_max_connect * sizeof(struct s3_conn *); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1891 | int i; |
| 1892 | |
| 1893 | cdata = cxgb3i_alloc_big_mem(sizeof(*cdata) + mapsize, GFP_KERNEL); |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 1894 | if (!cdata) { |
| 1895 | cxgb3i_log_warn("t3dev 0x%p, offload up, OOM %d.\n", |
| 1896 | cdev, mapsize); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1897 | return; |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 1898 | } |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1899 | |
| 1900 | if (cdev->ctl(cdev, GET_WR_LEN, &wr_len) < 0 || |
| 1901 | cdev->ctl(cdev, GET_PORTS, &cdata->ports) < 0 || |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 1902 | cdev->ctl(cdev, GET_RX_PAGE_INFO, &rx_page_info) < 0) { |
| 1903 | cxgb3i_log_warn("t3dev 0x%p, offload up, ioctl failed.\n", |
| 1904 | cdev); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1905 | goto free_cdata; |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 1906 | } |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1907 | |
| 1908 | s3_init_wr_tab(wr_len); |
| 1909 | |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 1910 | spin_lock_init(&cdata->lock); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1911 | INIT_LIST_HEAD(&cdata->list); |
| 1912 | cdata->cdev = cdev; |
| 1913 | cdata->client = client; |
| 1914 | |
| 1915 | for (i = 0; i < cdata->ports.nports; i++) |
| 1916 | NDEV2CDATA(cdata->ports.lldevs[i]) = cdata; |
| 1917 | |
| 1918 | write_lock(&cdata_rwlock); |
| 1919 | list_add_tail(&cdata->list, &cdata_list); |
| 1920 | write_unlock(&cdata_rwlock); |
| 1921 | |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 1922 | cxgb3i_log_info("t3dev 0x%p, offload up, added.\n", cdev); |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1923 | return; |
| 1924 | |
| 1925 | free_cdata: |
| 1926 | cxgb3i_free_big_mem(cdata); |
| 1927 | } |
| 1928 | |
| 1929 | /** |
| 1930 | * cxgb3i_sdev_remove - free the allocated resources for the adapter |
| 1931 | * @cdev: t3cdev adapter |
| 1932 | */ |
| 1933 | void cxgb3i_sdev_remove(struct t3cdev *cdev) |
| 1934 | { |
| 1935 | struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(cdev); |
| 1936 | |
Karen Xie | 2a90030f | 2009-04-01 13:11:26 -0500 | [diff] [blame] | 1937 | cxgb3i_log_info("t3dev 0x%p, offload down, remove.\n", cdev); |
| 1938 | |
Karen Xie | c367346 | 2008-12-09 14:15:32 -0800 | [diff] [blame] | 1939 | write_lock(&cdata_rwlock); |
| 1940 | list_del(&cdata->list); |
| 1941 | write_unlock(&cdata_rwlock); |
| 1942 | |
| 1943 | sdev_data_cleanup(cdata); |
| 1944 | } |