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