drivers/scsi/cxgbi/cxgb3i/cxgb3i.c

   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 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
  16
  17 #include <linux/module.h>
  18 #include <linux/moduleparam.h>
  19 #include <scsi/scsi_host.h>
  20
  21 #include "common.h"
  22 #include "t3_cpl.h"
  23 #include "t3cdev.h"
  24 #include "cxgb3_defs.h"
  25 #include "cxgb3_ctl_defs.h"
  26 #include "cxgb3_offload.h"
  27 #include "firmware_exports.h"
  28 #include "cxgb3i.h"
  29
  30 static unsigned int dbg_level;
  31 #include "../libcxgbi.h"
  32
  33 #define DRV_MODULE_NAME         "cxgb3i"
  34 #define DRV_MODULE_DESC         "Chelsio T3 iSCSI Driver"
  35 #define DRV_MODULE_VERSION      "2.0.0"
  36 #define DRV_MODULE_RELDATE      "Jun. 2010"
  37
  38 static char version[] =
  39         DRV_MODULE_DESC " " DRV_MODULE_NAME
  40         " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
  41
  42 MODULE_AUTHOR("Chelsio Communications, Inc.");
  43 MODULE_DESCRIPTION(DRV_MODULE_DESC);
  44 MODULE_VERSION(DRV_MODULE_VERSION);
  45 MODULE_LICENSE("GPL");
  46
  47 module_param(dbg_level, uint, 0644);
  48 MODULE_PARM_DESC(dbg_level, "debug flag (default=0)");
  49
  50 static int cxgb3i_rcv_win = 256 * 1024;
  51 module_param(cxgb3i_rcv_win, int, 0644);
  52 MODULE_PARM_DESC(cxgb3i_rcv_win, "TCP receive window in bytes (default=256KB)");
  53
  54 static int cxgb3i_snd_win = 128 * 1024;
  55 module_param(cxgb3i_snd_win, int, 0644);
  56 MODULE_PARM_DESC(cxgb3i_snd_win, "TCP send window in bytes (default=128KB)");
  57
  58 static int cxgb3i_rx_credit_thres = 10 * 1024;
  59 module_param(cxgb3i_rx_credit_thres, int, 0644);
  60 MODULE_PARM_DESC(rx_credit_thres,
  61                  "RX credits return threshold in bytes (default=10KB)");
  62
  63 static unsigned int cxgb3i_max_connect = 8 * 1024;
  64 module_param(cxgb3i_max_connect, uint, 0644);
  65 MODULE_PARM_DESC(cxgb3i_max_connect, "Max. # of connections (default=8092)");
  66
  67 static unsigned int cxgb3i_sport_base = 20000;
  68 module_param(cxgb3i_sport_base, uint, 0644);
  69 MODULE_PARM_DESC(cxgb3i_sport_base, "starting port number (default=20000)");
  70
  71 static void cxgb3i_dev_open(struct t3cdev *);
  72 static void cxgb3i_dev_close(struct t3cdev *);
  73 static void cxgb3i_dev_event_handler(struct t3cdev *, u32, u32);
  74
  75 static struct cxgb3_client t3_client = {
  76         .name = DRV_MODULE_NAME,
  77         .handlers = cxgb3i_cpl_handlers,
  78         .add = cxgb3i_dev_open,
  79         .remove = cxgb3i_dev_close,
  80         .event_handler = cxgb3i_dev_event_handler,
  81 };
  82
  83 static struct scsi_host_template cxgb3i_host_template = {
  84         .module         = THIS_MODULE,
  85         .name           = DRV_MODULE_NAME,
  86         .proc_name      = DRV_MODULE_NAME,
  87         .can_queue      = CXGB3I_SCSI_HOST_QDEPTH,
  88         .queuecommand   = iscsi_queuecommand,
  89         .change_queue_depth = iscsi_change_queue_depth,
  90         .sg_tablesize   = SG_ALL,
  91         .max_sectors    = 0xFFFF,
  92         .cmd_per_lun    = ISCSI_DEF_CMD_PER_LUN,
  93         .eh_abort_handler = iscsi_eh_abort,
  94         .eh_device_reset_handler = iscsi_eh_device_reset,
  95         .eh_target_reset_handler = iscsi_eh_recover_target,
  96         .target_alloc   = iscsi_target_alloc,
  97         .use_clustering = DISABLE_CLUSTERING,
  98         .this_id        = -1,
  99 };
 100
 101 static struct iscsi_transport cxgb3i_iscsi_transport = {
 102         .owner          = THIS_MODULE,
 103         .name           = DRV_MODULE_NAME,
 104         /* owner and name should be set already */
 105         .caps           = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
 106                                 | CAP_DATADGST | CAP_DIGEST_OFFLOAD |
 107                                 CAP_PADDING_OFFLOAD | CAP_TEXT_NEGO,
 108         .attr_is_visible        = cxgbi_attr_is_visible,
 109         .get_host_param = cxgbi_get_host_param,
 110         .set_host_param = cxgbi_set_host_param,
 111         /* session management */
 112         .create_session = cxgbi_create_session,
 113         .destroy_session        = cxgbi_destroy_session,
 114         .get_session_param = iscsi_session_get_param,
 115         /* connection management */
 116         .create_conn    = cxgbi_create_conn,
 117         .bind_conn      = cxgbi_bind_conn,
 118         .destroy_conn   = iscsi_tcp_conn_teardown,
 119         .start_conn     = iscsi_conn_start,
 120         .stop_conn      = iscsi_conn_stop,
 121         .get_conn_param = iscsi_conn_get_param,
 122         .set_param      = cxgbi_set_conn_param,
 123         .get_stats      = cxgbi_get_conn_stats,
 124         /* pdu xmit req from user space */
 125         .send_pdu       = iscsi_conn_send_pdu,
 126         /* task */
 127         .init_task      = iscsi_tcp_task_init,
 128         .xmit_task      = iscsi_tcp_task_xmit,
 129         .cleanup_task   = cxgbi_cleanup_task,
 130         /* pdu */
 131         .alloc_pdu      = cxgbi_conn_alloc_pdu,
 132         .init_pdu       = cxgbi_conn_init_pdu,
 133         .xmit_pdu       = cxgbi_conn_xmit_pdu,
 134         .parse_pdu_itt  = cxgbi_parse_pdu_itt,
 135         /* TCP connect/disconnect */
 136         .get_ep_param   = cxgbi_get_ep_param,
 137         .ep_connect     = cxgbi_ep_connect,
 138         .ep_poll        = cxgbi_ep_poll,
 139         .ep_disconnect  = cxgbi_ep_disconnect,
 140         /* Error recovery timeout call */
 141         .session_recovery_timedout = iscsi_session_recovery_timedout,
 142 };
 143
 144 static struct scsi_transport_template *cxgb3i_stt;
 145
 146 /*
 147  * CPL (Chelsio Protocol Language) defines a message passing interface between
 148  * the host driver and Chelsio asic.
 149  * The section below implments CPLs that related to iscsi tcp connection
 150  * open/close/abort and data send/receive.
 151  */
 152
 153 static int push_tx_frames(struct cxgbi_sock *csk, int req_completion);
 154
 155 static void send_act_open_req(struct cxgbi_sock *csk, struct sk_buff *skb,
 156                               const struct l2t_entry *e)
 157 {
 158         unsigned int wscale = cxgbi_sock_compute_wscale(cxgb3i_rcv_win);
 159         struct cpl_act_open_req *req = (struct cpl_act_open_req *)skb->head;
 160
 161         skb->priority = CPL_PRIORITY_SETUP;
 162
 163         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 164         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, csk->atid));
 165         req->local_port = csk->saddr.sin_port;
 166         req->peer_port = csk->daddr.sin_port;
 167         req->local_ip = csk->saddr.sin_addr.s_addr;
 168         req->peer_ip = csk->daddr.sin_addr.s_addr;
 169
 170         req->opt0h = htonl(V_KEEP_ALIVE(1) | F_TCAM_BYPASS |
 171                         V_WND_SCALE(wscale) | V_MSS_IDX(csk->mss_idx) |
 172                         V_L2T_IDX(e->idx) | V_TX_CHANNEL(e->smt_idx));
 173         req->opt0l = htonl(V_ULP_MODE(ULP2_MODE_ISCSI) |
 174                         V_RCV_BUFSIZ(cxgb3i_rcv_win>>10));
 175
 176         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 177                 "csk 0x%p,%u,0x%lx,%u, %pI4:%u-%pI4:%u, %u,%u,%u.\n",
 178                 csk, csk->state, csk->flags, csk->atid,
 179                 &req->local_ip, ntohs(req->local_port),
 180                 &req->peer_ip, ntohs(req->peer_port),
 181                 csk->mss_idx, e->idx, e->smt_idx);
 182
 183         l2t_send(csk->cdev->lldev, skb, csk->l2t);
 184 }
 185
 186 static inline void act_open_arp_failure(struct t3cdev *dev, struct sk_buff *skb)
 187 {
 188         cxgbi_sock_act_open_req_arp_failure(NULL, skb);
 189 }
 190
 191 /*
 192  * CPL connection close request: host ->
 193  *
 194  * Close a connection by sending a CPL_CLOSE_CON_REQ message and queue it to
 195  * the write queue (i.e., after any unsent txt data).
 196  */
 197 static void send_close_req(struct cxgbi_sock *csk)
 198 {
 199         struct sk_buff *skb = csk->cpl_close;
 200         struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
 201         unsigned int tid = csk->tid;
 202
 203         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 204                 "csk 0x%p,%u,0x%lx,%u.\n",
 205                 csk, csk->state, csk->flags, csk->tid);
 206
 207         csk->cpl_close = NULL;
 208         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_CLOSE_CON));
 209         req->wr.wr_lo = htonl(V_WR_TID(tid));
 210         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
 211         req->rsvd = htonl(csk->write_seq);
 212
 213         cxgbi_sock_skb_entail(csk, skb);
 214         if (csk->state >= CTP_ESTABLISHED)
 215                 push_tx_frames(csk, 1);
 216 }
 217
 218 /*
 219  * CPL connection abort request: host ->
 220  *
 221  * Send an ABORT_REQ message. Makes sure we do not send multiple ABORT_REQs
 222  * for the same connection and also that we do not try to send a message
 223  * after the connection has closed.
 224  */
 225 static void abort_arp_failure(struct t3cdev *tdev, struct sk_buff *skb)
 226 {
 227         struct cpl_abort_req *req = cplhdr(skb);
 228
 229         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 230                 "t3dev 0x%p, tid %u, skb 0x%p.\n",
 231                 tdev, GET_TID(req), skb);
 232         req->cmd = CPL_ABORT_NO_RST;
 233         cxgb3_ofld_send(tdev, skb);
 234 }
 235
 236 static void send_abort_req(struct cxgbi_sock *csk)
 237 {
 238         struct sk_buff *skb = csk->cpl_abort_req;
 239         struct cpl_abort_req *req;
 240
 241         if (unlikely(csk->state == CTP_ABORTING || !skb))
 242                 return;
 243         cxgbi_sock_set_state(csk, CTP_ABORTING);
 244         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
 245         /* Purge the send queue so we don't send anything after an abort. */
 246         cxgbi_sock_purge_write_queue(csk);
 247
 248         csk->cpl_abort_req = NULL;
 249         req = (struct cpl_abort_req *)skb->head;
 250         skb->priority = CPL_PRIORITY_DATA;
 251         set_arp_failure_handler(skb, abort_arp_failure);
 252         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_REQ));
 253         req->wr.wr_lo = htonl(V_WR_TID(csk->tid));
 254         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
 255         req->rsvd0 = htonl(csk->snd_nxt);
 256         req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);
 257         req->cmd = CPL_ABORT_SEND_RST;
 258
 259         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 260                 "csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
 261                 csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
 262                 req->rsvd1);
 263
 264         l2t_send(csk->cdev->lldev, skb, csk->l2t);
 265 }
 266
 267 /*
 268  * CPL connection abort reply: host ->
 269  *
 270  * Send an ABORT_RPL message in response of the ABORT_REQ received.
 271  */
 272 static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
 273 {
 274         struct sk_buff *skb = csk->cpl_abort_rpl;
 275         struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
 276
 277         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 278                 "csk 0x%p,%u,0x%lx,%u, status %d.\n",
 279                 csk, csk->state, csk->flags, csk->tid, rst_status);
 280
 281         csk->cpl_abort_rpl = NULL;
 282         skb->priority = CPL_PRIORITY_DATA;
 283         rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
 284         rpl->wr.wr_lo = htonl(V_WR_TID(csk->tid));
 285         OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
 286         rpl->cmd = rst_status;
 287         cxgb3_ofld_send(csk->cdev->lldev, skb);
 288 }
 289
 290 /*
 291  * CPL connection rx data ack: host ->
 292  * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
 293  * credits sent.
 294  */
 295 static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
 296 {
 297         struct sk_buff *skb;
 298         struct cpl_rx_data_ack *req;
 299         u32 dack = F_RX_DACK_CHANGE | V_RX_DACK_MODE(1);
 300
 301         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 302                 "csk 0x%p,%u,0x%lx,%u, credit %u, dack %u.\n",
 303                 csk, csk->state, csk->flags, csk->tid, credits, dack);
 304
 305         skb = alloc_wr(sizeof(*req), 0, GFP_ATOMIC);
 306         if (!skb) {
 307                 pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
 308                 return 0;
 309         }
 310         req = (struct cpl_rx_data_ack *)skb->head;
 311         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 312         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_RX_DATA_ACK, csk->tid));
 313         req->credit_dack = htonl(F_RX_DACK_CHANGE | V_RX_DACK_MODE(1) |
 314                                 V_RX_CREDITS(credits));
 315         skb->priority = CPL_PRIORITY_ACK;
 316         cxgb3_ofld_send(csk->cdev->lldev, skb);
 317         return credits;
 318 }
 319
 320 /*
 321  * CPL connection tx data: host ->
 322  *
 323  * Send iscsi PDU via TX_DATA CPL message. Returns the number of
 324  * credits sent.
 325  * Each TX_DATA consumes work request credit (wrs), so we need to keep track of
 326  * how many we've used so far and how many are pending (i.e., yet ack'ed by T3).
 327  */
 328
 329 static unsigned int wrlen __read_mostly;
 330 static unsigned int skb_wrs[SKB_WR_LIST_SIZE] __read_mostly;
 331
 332 static void init_wr_tab(unsigned int wr_len)
 333 {
 334         int i;
 335
 336         if (skb_wrs[1])         /* already initialized */
 337                 return;
 338         for (i = 1; i < SKB_WR_LIST_SIZE; i++) {
 339                 int sgl_len = (3 * i) / 2 + (i & 1);
 340
 341                 sgl_len += 3;
 342                 skb_wrs[i] = (sgl_len <= wr_len
 343                               ? 1 : 1 + (sgl_len - 2) / (wr_len - 1));
 344         }
 345         wrlen = wr_len * 8;
 346 }
 347
 348 static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
 349                                    int len, int req_completion)
 350 {
 351         struct tx_data_wr *req;
 352         struct l2t_entry *l2t = csk->l2t;
 353
 354         skb_reset_transport_header(skb);
 355         req = (struct tx_data_wr *)__skb_push(skb, sizeof(*req));
 356         req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA) |
 357                         (req_completion ? F_WR_COMPL : 0));
 358         req->wr_lo = htonl(V_WR_TID(csk->tid));
 359         /* len includes the length of any HW ULP additions */
 360         req->len = htonl(len);
 361         /* V_TX_ULP_SUBMODE sets both the mode and submode */
 362         req->flags = htonl(V_TX_ULP_SUBMODE(cxgbi_skcb_ulp_mode(skb)) |
 363                            V_TX_SHOVE((skb_peek(&csk->write_queue) ? 0 : 1)));
 364         req->sndseq = htonl(csk->snd_nxt);
 365         req->param = htonl(V_TX_PORT(l2t->smt_idx));
 366
 367         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
 368                 req->flags |= htonl(V_TX_ACK_PAGES(2) | F_TX_INIT |
 369                                     V_TX_CPU_IDX(csk->rss_qid));
 370                 /* sendbuffer is in units of 32KB. */
 371                 req->param |= htonl(V_TX_SNDBUF(cxgb3i_snd_win >> 15));
 372                 cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
 373         }
 374 }
 375
 376 /**
 377  * push_tx_frames -- start transmit
 378  * @c3cn: the offloaded connection
 379  * @req_completion: request wr_ack or not
 380  *
 381  * Prepends TX_DATA_WR or CPL_CLOSE_CON_REQ headers to buffers waiting in a
 382  * connection's send queue and sends them on to T3.  Must be called with the
 383  * connection's lock held.  Returns the amount of send buffer space that was
 384  * freed as a result of sending queued data to T3.
 385  */
 386
 387 static void arp_failure_skb_discard(struct t3cdev *dev, struct sk_buff *skb)
 388 {
 389         kfree_skb(skb);
 390 }
 391
 392 static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
 393 {
 394         int total_size = 0;
 395         struct sk_buff *skb;
 396
 397         if (unlikely(csk->state < CTP_ESTABLISHED ||
 398                 csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
 399                         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
 400                                 "csk 0x%p,%u,0x%lx,%u, in closing state.\n",
 401                                 csk, csk->state, csk->flags, csk->tid);
 402                 return 0;
 403         }
 404
 405         while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
 406                 int len = skb->len;     /* length before skb_push */
 407                 int frags = skb_shinfo(skb)->nr_frags + (len != skb->data_len);
 408                 int wrs_needed = skb_wrs[frags];
 409
 410                 if (wrs_needed > 1 && len + sizeof(struct tx_data_wr) <= wrlen)
 411                         wrs_needed = 1;
 412
 413                 WARN_ON(frags >= SKB_WR_LIST_SIZE || wrs_needed < 1);
 414
 415                 if (csk->wr_cred < wrs_needed) {
 416                         log_debug(1 << CXGBI_DBG_PDU_TX,
 417                                 "csk 0x%p, skb len %u/%u, frag %u, wr %d<%u.\n",
 418                                 csk, skb->len, skb->data_len, frags,
 419                                 wrs_needed, csk->wr_cred);
 420                         break;
 421                 }
 422
 423                 __skb_unlink(skb, &csk->write_queue);
 424                 skb->priority = CPL_PRIORITY_DATA;
 425                 skb->csum = wrs_needed; /* remember this until the WR_ACK */
 426                 csk->wr_cred -= wrs_needed;
 427                 csk->wr_una_cred += wrs_needed;
 428                 cxgbi_sock_enqueue_wr(csk, skb);
 429
 430                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
 431                         "csk 0x%p, enqueue, skb len %u/%u, frag %u, wr %d, "
 432                         "left %u, unack %u.\n",
 433                         csk, skb->len, skb->data_len, frags, skb->csum,
 434                         csk->wr_cred, csk->wr_una_cred);
 435
 436                 if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
 437                         if ((req_completion &&
 438                                 csk->wr_una_cred == wrs_needed) ||
 439                              csk->wr_una_cred >= csk->wr_max_cred / 2) {
 440                                 req_completion = 1;
 441                                 csk->wr_una_cred = 0;
 442                         }
 443                         len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
 444                         make_tx_data_wr(csk, skb, len, req_completion);
 445                         csk->snd_nxt += len;
 446                         cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
 447                 }
 448                 total_size += skb->truesize;
 449                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
 450                         "csk 0x%p, tid 0x%x, send skb 0x%p.\n",
 451                         csk, csk->tid, skb);
 452                 set_arp_failure_handler(skb, arp_failure_skb_discard);
 453                 l2t_send(csk->cdev->lldev, skb, csk->l2t);
 454         }
 455         return total_size;
 456 }
 457
 458 /*
 459  * Process a CPL_ACT_ESTABLISH message: -> host
 460  * Updates connection state from an active establish CPL message.  Runs with
 461  * the connection lock held.
 462  */
 463
 464 static inline void free_atid(struct cxgbi_sock *csk)
 465 {
 466         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
 467                 cxgb3_free_atid(csk->cdev->lldev, csk->atid);
 468                 cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
 469                 cxgbi_sock_put(csk);
 470         }
 471 }
 472
 473 static int do_act_establish(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
 474 {
 475         struct cxgbi_sock *csk = ctx;
 476         struct cpl_act_establish *req = cplhdr(skb);
 477         unsigned int tid = GET_TID(req);
 478         unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
 479         u32 rcv_isn = ntohl(req->rcv_isn);      /* real RCV_ISN + 1 */
 480
 481         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 482                 "atid 0x%x,tid 0x%x, csk 0x%p,%u,0x%lx, isn %u.\n",
 483                 atid, atid, csk, csk->state, csk->flags, rcv_isn);
 484
 485         cxgbi_sock_get(csk);
 486         cxgbi_sock_set_flag(csk, CTPF_HAS_TID);
 487         csk->tid = tid;
 488         cxgb3_insert_tid(csk->cdev->lldev, &t3_client, csk, tid);
 489
 490         free_atid(csk);
 491
 492         csk->rss_qid = G_QNUM(ntohs(skb->csum));
 493
 494         spin_lock_bh(&csk->lock);
 495         if (csk->retry_timer.function) {
 496                 del_timer(&csk->retry_timer);
 497                 csk->retry_timer.function = NULL;
 498         }
 499
 500         if (unlikely(csk->state != CTP_ACTIVE_OPEN))
 501                 pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
 502                         csk, csk->state, csk->flags, csk->tid);
 503
 504         csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
 505         if (cxgb3i_rcv_win > (M_RCV_BUFSIZ << 10))
 506                 csk->rcv_wup -= cxgb3i_rcv_win - (M_RCV_BUFSIZ << 10);
 507
 508         cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));
 509
 510         if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
 511                 /* upper layer has requested closing */
 512                 send_abort_req(csk);
 513         else {
 514                 if (skb_queue_len(&csk->write_queue))
 515                         push_tx_frames(csk, 1);
 516                 cxgbi_conn_tx_open(csk);
 517         }
 518
 519         spin_unlock_bh(&csk->lock);
 520         __kfree_skb(skb);
 521         return 0;
 522 }
 523
 524 /*
 525  * Process a CPL_ACT_OPEN_RPL message: -> host
 526  * Handle active open failures.
 527  */
 528 static int act_open_rpl_status_to_errno(int status)
 529 {
 530         switch (status) {
 531         case CPL_ERR_CONN_RESET:
 532                 return -ECONNREFUSED;
 533         case CPL_ERR_ARP_MISS:
 534                 return -EHOSTUNREACH;
 535         case CPL_ERR_CONN_TIMEDOUT:
 536                 return -ETIMEDOUT;
 537         case CPL_ERR_TCAM_FULL:
 538                 return -ENOMEM;
 539         case CPL_ERR_CONN_EXIST:
 540                 return -EADDRINUSE;
 541         default:
 542                 return -EIO;
 543         }
 544 }
 545
 546 static void act_open_retry_timer(unsigned long data)
 547 {
 548         struct sk_buff *skb;
 549         struct cxgbi_sock *csk = (struct cxgbi_sock *)data;
 550
 551         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 552                 "csk 0x%p,%u,0x%lx,%u.\n",
 553                 csk, csk->state, csk->flags, csk->tid);
 554
 555         cxgbi_sock_get(csk);
 556         spin_lock_bh(&csk->lock);
 557         skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_ATOMIC);
 558         if (!skb)
 559                 cxgbi_sock_fail_act_open(csk, -ENOMEM);
 560         else {
 561                 skb->sk = (struct sock *)csk;
 562                 set_arp_failure_handler(skb, act_open_arp_failure);
 563                 send_act_open_req(csk, skb, csk->l2t);
 564         }
 565         spin_unlock_bh(&csk->lock);
 566         cxgbi_sock_put(csk);
 567 }
 568
 569 static int do_act_open_rpl(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
 570 {
 571         struct cxgbi_sock *csk = ctx;
 572         struct cpl_act_open_rpl *rpl = cplhdr(skb);
 573
 574         pr_info("csk 0x%p,%u,0x%lx,%u, status %u, %pI4:%u-%pI4:%u.\n",
 575                 csk, csk->state, csk->flags, csk->atid, rpl->status,
 576                 &csk->saddr.sin_addr.s_addr, ntohs(csk->saddr.sin_port),
 577                 &csk->daddr.sin_addr.s_addr, ntohs(csk->daddr.sin_port));
 578
 579         if (rpl->status != CPL_ERR_TCAM_FULL &&
 580             rpl->status != CPL_ERR_CONN_EXIST &&
 581             rpl->status != CPL_ERR_ARP_MISS)
 582                 cxgb3_queue_tid_release(tdev, GET_TID(rpl));
 583
 584         cxgbi_sock_get(csk);
 585         spin_lock_bh(&csk->lock);
 586         if (rpl->status == CPL_ERR_CONN_EXIST &&
 587             csk->retry_timer.function != act_open_retry_timer) {
 588                 csk->retry_timer.function = act_open_retry_timer;
 589                 mod_timer(&csk->retry_timer, jiffies + HZ / 2);
 590         } else
 591                 cxgbi_sock_fail_act_open(csk,
 592                                 act_open_rpl_status_to_errno(rpl->status));
 593
 594         spin_unlock_bh(&csk->lock);
 595         cxgbi_sock_put(csk);
 596         __kfree_skb(skb);
 597         return 0;
 598 }
 599
 600 /*
 601  * Process PEER_CLOSE CPL messages: -> host
 602  * Handle peer FIN.
 603  */
 604 static int do_peer_close(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
 605 {
 606         struct cxgbi_sock *csk = ctx;
 607
 608         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 609                 "csk 0x%p,%u,0x%lx,%u.\n",
 610                 csk, csk->state, csk->flags, csk->tid);
 611
 612         cxgbi_sock_rcv_peer_close(csk);
 613         __kfree_skb(skb);
 614         return 0;
 615 }
 616
 617 /*
 618  * Process CLOSE_CONN_RPL CPL message: -> host
 619  * Process a peer ACK to our FIN.
 620  */
 621 static int do_close_con_rpl(struct t3cdev *cdev, struct sk_buff *skb,
 622                             void *ctx)
 623 {
 624         struct cxgbi_sock *csk = ctx;
 625         struct cpl_close_con_rpl *rpl = cplhdr(skb);
 626
 627         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 628                 "csk 0x%p,%u,0x%lx,%u, snxt %u.\n",
 629                 csk, csk->state, csk->flags, csk->tid, ntohl(rpl->snd_nxt));
 630
 631         cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
 632         __kfree_skb(skb);
 633         return 0;
 634 }
 635
 636 /*
 637  * Process ABORT_REQ_RSS CPL message: -> host
 638  * Process abort requests.  If we are waiting for an ABORT_RPL we ignore this
 639  * request except that we need to reply to it.
 640  */
 641
 642 static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
 643                                  int *need_rst)
 644 {
 645         switch (abort_reason) {
 646         case CPL_ERR_BAD_SYN: /* fall through */
 647         case CPL_ERR_CONN_RESET:
 648                 return csk->state > CTP_ESTABLISHED ? -EPIPE : -ECONNRESET;
 649         case CPL_ERR_XMIT_TIMEDOUT:
 650         case CPL_ERR_PERSIST_TIMEDOUT:
 651         case CPL_ERR_FINWAIT2_TIMEDOUT:
 652         case CPL_ERR_KEEPALIVE_TIMEDOUT:
 653                 return -ETIMEDOUT;
 654         default:
 655                 return -EIO;
 656         }
 657 }
 658
 659 static int do_abort_req(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
 660 {
 661         const struct cpl_abort_req_rss *req = cplhdr(skb);
 662         struct cxgbi_sock *csk = ctx;
 663         int rst_status = CPL_ABORT_NO_RST;
 664
 665         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 666                 "csk 0x%p,%u,0x%lx,%u.\n",
 667                 csk, csk->state, csk->flags, csk->tid);
 668
 669         if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
 670             req->status == CPL_ERR_PERSIST_NEG_ADVICE) {
 671                 goto done;
 672         }
 673
 674         cxgbi_sock_get(csk);
 675         spin_lock_bh(&csk->lock);
 676
 677         if (!cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) {
 678                 cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
 679                 cxgbi_sock_set_state(csk, CTP_ABORTING);
 680                 goto out;
 681         }
 682
 683         cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
 684         send_abort_rpl(csk, rst_status);
 685
 686         if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 687                 csk->err = abort_status_to_errno(csk, req->status, &rst_status);
 688                 cxgbi_sock_closed(csk);
 689         }
 690
 691 out:
 692         spin_unlock_bh(&csk->lock);
 693         cxgbi_sock_put(csk);
 694 done:
 695         __kfree_skb(skb);
 696         return 0;
 697 }
 698
 699 /*
 700  * Process ABORT_RPL_RSS CPL message: -> host
 701  * Process abort replies.  We only process these messages if we anticipate
 702  * them as the coordination between SW and HW in this area is somewhat lacking
 703  * and sometimes we get ABORT_RPLs after we are done with the connection that
 704  * originated the ABORT_REQ.
 705  */
 706 static int do_abort_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
 707 {
 708         struct cpl_abort_rpl_rss *rpl = cplhdr(skb);
 709         struct cxgbi_sock *csk = ctx;
 710
 711         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 712                 "status 0x%x, csk 0x%p, s %u, 0x%lx.\n",
 713                 rpl->status, csk, csk ? csk->state : 0,
 714                 csk ? csk->flags : 0UL);
 715         /*
 716          * Ignore replies to post-close aborts indicating that the abort was
 717          * requested too late.  These connections are terminated when we get
 718          * PEER_CLOSE or CLOSE_CON_RPL and by the time the abort_rpl_rss
 719          * arrives the TID is either no longer used or it has been recycled.
 720          */
 721         if (rpl->status == CPL_ERR_ABORT_FAILED)
 722                 goto rel_skb;
 723         /*
 724          * Sometimes we've already closed the connection, e.g., a post-close
 725          * abort races with ABORT_REQ_RSS, the latter frees the connection
 726          * expecting the ABORT_REQ will fail with CPL_ERR_ABORT_FAILED,
 727          * but FW turns the ABORT_REQ into a regular one and so we get
 728          * ABORT_RPL_RSS with status 0 and no connection.
 729          */
 730         if (csk)
 731                 cxgbi_sock_rcv_abort_rpl(csk);
 732 rel_skb:
 733         __kfree_skb(skb);
 734         return 0;
 735 }
 736
 737 /*
 738  * Process RX_ISCSI_HDR CPL message: -> host
 739  * Handle received PDUs, the payload could be DDP'ed. If not, the payload
 740  * follow after the bhs.
 741  */
 742 static int do_iscsi_hdr(struct t3cdev *t3dev, struct sk_buff *skb, void *ctx)
 743 {
 744         struct cxgbi_sock *csk = ctx;
 745         struct cpl_iscsi_hdr *hdr_cpl = cplhdr(skb);
 746         struct cpl_iscsi_hdr_norss data_cpl;
 747         struct cpl_rx_data_ddp_norss ddp_cpl;
 748         unsigned int hdr_len, data_len, status;
 749         unsigned int len;
 750         int err;
 751
 752         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 753                 "csk 0x%p,%u,0x%lx,%u, skb 0x%p,%u.\n",
 754                 csk, csk->state, csk->flags, csk->tid, skb, skb->len);
 755
 756         spin_lock_bh(&csk->lock);
 757
 758         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
 759                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 760                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
 761                         csk, csk->state, csk->flags, csk->tid);
 762                 if (csk->state != CTP_ABORTING)
 763                         goto abort_conn;
 764                 else
 765                         goto discard;
 766         }
 767
 768         cxgbi_skcb_tcp_seq(skb) = ntohl(hdr_cpl->seq);
 769         cxgbi_skcb_flags(skb) = 0;
 770
 771         skb_reset_transport_header(skb);
 772         __skb_pull(skb, sizeof(struct cpl_iscsi_hdr));
 773
 774         len = hdr_len = ntohs(hdr_cpl->len);
 775         /* msg coalesce is off or not enough data received */
 776         if (skb->len <= hdr_len) {
 777                 pr_err("%s: tid %u, CPL_ISCSI_HDR, skb len %u < %u.\n",
 778                         csk->cdev->ports[csk->port_id]->name, csk->tid,
 779                         skb->len, hdr_len);
 780                 goto abort_conn;
 781         }
 782         cxgbi_skcb_set_flag(skb, SKCBF_RX_COALESCED);
 783
 784         err = skb_copy_bits(skb, skb->len - sizeof(ddp_cpl), &ddp_cpl,
 785                             sizeof(ddp_cpl));
 786         if (err < 0) {
 787                 pr_err("%s: tid %u, copy cpl_ddp %u-%zu failed %d.\n",
 788                         csk->cdev->ports[csk->port_id]->name, csk->tid,
 789                         skb->len, sizeof(ddp_cpl), err);
 790                 goto abort_conn;
 791         }
 792
 793         cxgbi_skcb_set_flag(skb, SKCBF_RX_STATUS);
 794         cxgbi_skcb_rx_pdulen(skb) = ntohs(ddp_cpl.len);
 795         cxgbi_skcb_rx_ddigest(skb) = ntohl(ddp_cpl.ulp_crc);
 796         status = ntohl(ddp_cpl.ddp_status);
 797
 798         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 799                 "csk 0x%p, skb 0x%p,%u, pdulen %u, status 0x%x.\n",
 800                 csk, skb, skb->len, cxgbi_skcb_rx_pdulen(skb), status);
 801
 802         if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT))
 803                 cxgbi_skcb_set_flag(skb, SKCBF_RX_HCRC_ERR);
 804         if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT))
 805                 cxgbi_skcb_set_flag(skb, SKCBF_RX_DCRC_ERR);
 806         if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT))
 807                 cxgbi_skcb_set_flag(skb, SKCBF_RX_PAD_ERR);
 808
 809         if (skb->len > (hdr_len + sizeof(ddp_cpl))) {
 810                 err = skb_copy_bits(skb, hdr_len, &data_cpl, sizeof(data_cpl));
 811                 if (err < 0) {
 812                         pr_err("%s: tid %u, cp %zu/%u failed %d.\n",
 813                                 csk->cdev->ports[csk->port_id]->name,
 814                                 csk->tid, sizeof(data_cpl), skb->len, err);
 815                         goto abort_conn;
 816                 }
 817                 data_len = ntohs(data_cpl.len);
 818                 log_debug(1 << CXGBI_DBG_DDP | 1 << CXGBI_DBG_PDU_RX,
 819                         "skb 0x%p, pdu not ddp'ed %u/%u, status 0x%x.\n",
 820                         skb, data_len, cxgbi_skcb_rx_pdulen(skb), status);
 821                 len += sizeof(data_cpl) + data_len;
 822         } else if (status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT))
 823                 cxgbi_skcb_set_flag(skb, SKCBF_RX_DATA_DDPD);
 824
 825         csk->rcv_nxt = ntohl(ddp_cpl.seq) + cxgbi_skcb_rx_pdulen(skb);
 826         __pskb_trim(skb, len);
 827         __skb_queue_tail(&csk->receive_queue, skb);
 828         cxgbi_conn_pdu_ready(csk);
 829
 830         spin_unlock_bh(&csk->lock);
 831         return 0;
 832
 833 abort_conn:
 834         send_abort_req(csk);
 835 discard:
 836         spin_unlock_bh(&csk->lock);
 837         __kfree_skb(skb);
 838         return 0;
 839 }
 840
 841 /*
 842  * Process TX_DATA_ACK CPL messages: -> host
 843  * Process an acknowledgment of WR completion.  Advance snd_una and send the
 844  * next batch of work requests from the write queue.
 845  */
 846 static int do_wr_ack(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
 847 {
 848         struct cxgbi_sock *csk = ctx;
 849         struct cpl_wr_ack *hdr = cplhdr(skb);
 850
 851         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 852                 "csk 0x%p,%u,0x%lx,%u, cr %u.\n",
 853                 csk, csk->state, csk->flags, csk->tid, ntohs(hdr->credits));
 854
 855         cxgbi_sock_rcv_wr_ack(csk, ntohs(hdr->credits), ntohl(hdr->snd_una), 1);
 856         __kfree_skb(skb);
 857         return 0;
 858 }
 859
 860 /*
 861  * for each connection, pre-allocate skbs needed for close/abort requests. So
 862  * that we can service the request right away.
 863  */
 864 static int alloc_cpls(struct cxgbi_sock *csk)
 865 {
 866         csk->cpl_close = alloc_wr(sizeof(struct cpl_close_con_req), 0,
 867                                         GFP_KERNEL);
 868         if (!csk->cpl_close)
 869                 return -ENOMEM;
 870         csk->cpl_abort_req = alloc_wr(sizeof(struct cpl_abort_req), 0,
 871                                         GFP_KERNEL);
 872         if (!csk->cpl_abort_req)
 873                 goto free_cpl_skbs;
 874
 875         csk->cpl_abort_rpl = alloc_wr(sizeof(struct cpl_abort_rpl), 0,
 876                                         GFP_KERNEL);
 877         if (!csk->cpl_abort_rpl)
 878                 goto free_cpl_skbs;
 879
 880         return 0;
 881
 882 free_cpl_skbs:
 883         cxgbi_sock_free_cpl_skbs(csk);
 884         return -ENOMEM;
 885 }
 886
 887 /**
 888  * release_offload_resources - release offload resource
 889  * @c3cn: the offloaded iscsi tcp connection.
 890  * Release resources held by an offload connection (TID, L2T entry, etc.)
 891  */
 892 static void l2t_put(struct cxgbi_sock *csk)
 893 {
 894         struct t3cdev *t3dev = (struct t3cdev *)csk->cdev->lldev;
 895
 896         if (csk->l2t) {
 897                 l2t_release(t3dev, csk->l2t);
 898                 csk->l2t = NULL;
 899                 cxgbi_sock_put(csk);
 900         }
 901 }
 902
 903 static void release_offload_resources(struct cxgbi_sock *csk)
 904 {
 905         struct t3cdev *t3dev = (struct t3cdev *)csk->cdev->lldev;
 906
 907         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 908                 "csk 0x%p,%u,0x%lx,%u.\n",
 909                 csk, csk->state, csk->flags, csk->tid);
 910
 911         csk->rss_qid = 0;
 912         cxgbi_sock_free_cpl_skbs(csk);
 913
 914         if (csk->wr_cred != csk->wr_max_cred) {
 915                 cxgbi_sock_purge_wr_queue(csk);
 916                 cxgbi_sock_reset_wr_list(csk);
 917         }
 918         l2t_put(csk);
 919         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
 920                 free_atid(csk);
 921         else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
 922                 cxgb3_remove_tid(t3dev, (void *)csk, csk->tid);
 923                 cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
 924                 cxgbi_sock_put(csk);
 925         }
 926         csk->dst = NULL;
 927         csk->cdev = NULL;
 928 }
 929
 930 static void update_address(struct cxgbi_hba *chba)
 931 {
 932         if (chba->ipv4addr) {
 933                 if (chba->vdev &&
 934                     chba->ipv4addr != cxgb3i_get_private_ipv4addr(chba->vdev)) {
 935                         cxgb3i_set_private_ipv4addr(chba->vdev, chba->ipv4addr);
 936                         cxgb3i_set_private_ipv4addr(chba->ndev, 0);
 937                         pr_info("%s set %pI4.\n",
 938                                 chba->vdev->name, &chba->ipv4addr);
 939                 } else if (chba->ipv4addr !=
 940                                 cxgb3i_get_private_ipv4addr(chba->ndev)) {
 941                         cxgb3i_set_private_ipv4addr(chba->ndev, chba->ipv4addr);
 942                         pr_info("%s set %pI4.\n",
 943                                 chba->ndev->name, &chba->ipv4addr);
 944                 }
 945         } else if (cxgb3i_get_private_ipv4addr(chba->ndev)) {
 946                 if (chba->vdev)
 947                         cxgb3i_set_private_ipv4addr(chba->vdev, 0);
 948                 cxgb3i_set_private_ipv4addr(chba->ndev, 0);
 949         }
 950 }
 951
 952 static int init_act_open(struct cxgbi_sock *csk)
 953 {
 954         struct dst_entry *dst = csk->dst;
 955         struct cxgbi_device *cdev = csk->cdev;
 956         struct t3cdev *t3dev = (struct t3cdev *)cdev->lldev;
 957         struct net_device *ndev = cdev->ports[csk->port_id];
 958         struct cxgbi_hba *chba = cdev->hbas[csk->port_id];
 959         struct sk_buff *skb = NULL;
 960
 961         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 962                 "csk 0x%p,%u,0x%lx.\n", csk, csk->state, csk->flags);
 963
 964         update_address(chba);
 965         if (chba->ipv4addr)
 966                 csk->saddr.sin_addr.s_addr = chba->ipv4addr;
 967
 968         csk->rss_qid = 0;
 969         csk->l2t = t3_l2t_get(t3dev, dst, ndev,
 970                               &csk->daddr.sin_addr.s_addr);
 971         if (!csk->l2t) {
 972                 pr_err("NO l2t available.\n");
 973                 return -EINVAL;
 974         }
 975         cxgbi_sock_get(csk);
 976
 977         csk->atid = cxgb3_alloc_atid(t3dev, &t3_client, csk);
 978         if (csk->atid < 0) {
 979                 pr_err("NO atid available.\n");
 980                 goto rel_resource;
 981         }
 982         cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
 983         cxgbi_sock_get(csk);
 984
 985         skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_KERNEL);
 986         if (!skb)
 987                 goto rel_resource;
 988         skb->sk = (struct sock *)csk;
 989         set_arp_failure_handler(skb, act_open_arp_failure);
 990
 991         csk->wr_max_cred = csk->wr_cred = T3C_DATA(t3dev)->max_wrs - 1;
 992         csk->wr_una_cred = 0;
 993         csk->mss_idx = cxgbi_sock_select_mss(csk, dst_mtu(dst));
 994         cxgbi_sock_reset_wr_list(csk);
 995         csk->err = 0;
 996
 997         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 998                 "csk 0x%p,%u,0x%lx, %pI4:%u-%pI4:%u.\n",
 999                 csk, csk->state, csk->flags,
1000                 &csk->saddr.sin_addr.s_addr, ntohs(csk->saddr.sin_port),
1001                 &csk->daddr.sin_addr.s_addr, ntohs(csk->daddr.sin_port));
1002
1003         cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
1004         send_act_open_req(csk, skb, csk->l2t);
1005         return 0;
1006
1007 rel_resource:
1008         if (skb)
1009                 __kfree_skb(skb);
1010         return -EINVAL;
1011 }
1012
1013 cxgb3_cpl_handler_func cxgb3i_cpl_handlers[NUM_CPL_CMDS] = {
1014         [CPL_ACT_ESTABLISH] = do_act_establish,
1015         [CPL_ACT_OPEN_RPL] = do_act_open_rpl,
1016         [CPL_PEER_CLOSE] = do_peer_close,
1017         [CPL_ABORT_REQ_RSS] = do_abort_req,
1018         [CPL_ABORT_RPL_RSS] = do_abort_rpl,
1019         [CPL_CLOSE_CON_RPL] = do_close_con_rpl,
1020         [CPL_TX_DMA_ACK] = do_wr_ack,
1021         [CPL_ISCSI_HDR] = do_iscsi_hdr,
1022 };
1023
1024 /**
1025  * cxgb3i_ofld_init - allocate and initialize resources for each adapter found
1026  * @cdev:       cxgbi adapter
1027  */
1028 int cxgb3i_ofld_init(struct cxgbi_device *cdev)
1029 {
1030         struct t3cdev *t3dev = (struct t3cdev *)cdev->lldev;
1031         struct adap_ports port;
1032         struct ofld_page_info rx_page_info;
1033         unsigned int wr_len;
1034         int rc;
1035
1036         if (t3dev->ctl(t3dev, GET_WR_LEN, &wr_len) < 0 ||
1037             t3dev->ctl(t3dev, GET_PORTS, &port) < 0 ||
1038             t3dev->ctl(t3dev, GET_RX_PAGE_INFO, &rx_page_info) < 0) {
1039                 pr_warn("t3 0x%p, offload up, ioctl failed.\n", t3dev);
1040                 return -EINVAL;
1041         }
1042
1043         if (cxgb3i_max_connect > CXGBI_MAX_CONN)
1044                 cxgb3i_max_connect = CXGBI_MAX_CONN;
1045
1046         rc = cxgbi_device_portmap_create(cdev, cxgb3i_sport_base,
1047                                         cxgb3i_max_connect);
1048         if (rc < 0)
1049                 return rc;
1050
1051         init_wr_tab(wr_len);
1052         cdev->csk_release_offload_resources = release_offload_resources;
1053         cdev->csk_push_tx_frames = push_tx_frames;
1054         cdev->csk_send_abort_req = send_abort_req;
1055         cdev->csk_send_close_req = send_close_req;
1056         cdev->csk_send_rx_credits = send_rx_credits;
1057         cdev->csk_alloc_cpls = alloc_cpls;
1058         cdev->csk_init_act_open = init_act_open;
1059
1060         pr_info("cdev 0x%p, offload up, added.\n", cdev);
1061         return 0;
1062 }
1063
1064 /*
1065  * functions to program the pagepod in h/w
1066  */
1067 static inline void ulp_mem_io_set_hdr(struct sk_buff *skb, unsigned int addr)
1068 {
1069         struct ulp_mem_io *req = (struct ulp_mem_io *)skb->head;
1070
1071         memset(req, 0, sizeof(*req));
1072
1073         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_BYPASS));
1074         req->cmd_lock_addr = htonl(V_ULP_MEMIO_ADDR(addr >> 5) |
1075                                    V_ULPTX_CMD(ULP_MEM_WRITE));
1076         req->len = htonl(V_ULP_MEMIO_DATA_LEN(PPOD_SIZE >> 5) |
1077                          V_ULPTX_NFLITS((PPOD_SIZE >> 3) + 1));
1078 }
1079
1080 static int ddp_set_map(struct cxgbi_sock *csk, struct cxgbi_pagepod_hdr *hdr,
1081                         unsigned int idx, unsigned int npods,
1082                                 struct cxgbi_gather_list *gl)
1083 {
1084         struct cxgbi_device *cdev = csk->cdev;
1085         struct cxgbi_ddp_info *ddp = cdev->ddp;
1086         unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
1087         int i;
1088
1089         log_debug(1 << CXGBI_DBG_DDP,
1090                 "csk 0x%p, idx %u, npods %u, gl 0x%p.\n",
1091                 csk, idx, npods, gl);
1092
1093         for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
1094                 struct sk_buff *skb = alloc_wr(sizeof(struct ulp_mem_io) +
1095                                                 PPOD_SIZE, 0, GFP_ATOMIC);
1096
1097                 if (!skb)
1098                         return -ENOMEM;
1099
1100                 ulp_mem_io_set_hdr(skb, pm_addr);
1101                 cxgbi_ddp_ppod_set((struct cxgbi_pagepod *)(skb->head +
1102                                         sizeof(struct ulp_mem_io)),
1103                                    hdr, gl, i * PPOD_PAGES_MAX);
1104                 skb->priority = CPL_PRIORITY_CONTROL;
1105                 cxgb3_ofld_send(cdev->lldev, skb);
1106         }
1107         return 0;
1108 }
1109
1110 static void ddp_clear_map(struct cxgbi_hba *chba, unsigned int tag,
1111                           unsigned int idx, unsigned int npods)
1112 {
1113         struct cxgbi_device *cdev = chba->cdev;
1114         struct cxgbi_ddp_info *ddp = cdev->ddp;
1115         unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
1116         int i;
1117
1118         log_debug(1 << CXGBI_DBG_DDP,
1119                 "cdev 0x%p, idx %u, npods %u, tag 0x%x.\n",
1120                 cdev, idx, npods, tag);
1121
1122         for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
1123                 struct sk_buff *skb = alloc_wr(sizeof(struct ulp_mem_io) +
1124                                                 PPOD_SIZE, 0, GFP_ATOMIC);
1125
1126                 if (!skb) {
1127                         pr_err("tag 0x%x, 0x%x, %d/%u, skb OOM.\n",
1128                                 tag, idx, i, npods);
1129                         continue;
1130                 }
1131                 ulp_mem_io_set_hdr(skb, pm_addr);
1132                 skb->priority = CPL_PRIORITY_CONTROL;
1133                 cxgb3_ofld_send(cdev->lldev, skb);
1134         }
1135 }
1136
1137 static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk,
1138                                        unsigned int tid, int pg_idx, bool reply)
1139 {
1140         struct sk_buff *skb = alloc_wr(sizeof(struct cpl_set_tcb_field), 0,
1141                                         GFP_KERNEL);
1142         struct cpl_set_tcb_field *req;
1143         u64 val = pg_idx < DDP_PGIDX_MAX ? pg_idx : 0;
1144
1145         log_debug(1 << CXGBI_DBG_DDP,
1146                 "csk 0x%p, tid %u, pg_idx %d.\n", csk, tid, pg_idx);
1147         if (!skb)
1148                 return -ENOMEM;
1149
1150         /* set up ulp submode and page size */
1151         req = (struct cpl_set_tcb_field *)skb->head;
1152         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
1153         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1154         req->reply = V_NO_REPLY(reply ? 0 : 1);
1155         req->cpu_idx = 0;
1156         req->word = htons(31);
1157         req->mask = cpu_to_be64(0xF0000000);
1158         req->val = cpu_to_be64(val << 28);
1159         skb->priority = CPL_PRIORITY_CONTROL;
1160
1161         cxgb3_ofld_send(csk->cdev->lldev, skb);
1162         return 0;
1163 }
1164
1165 /**
1166  * cxgb3i_setup_conn_digest - setup conn. digest setting
1167  * @csk: cxgb tcp socket
1168  * @tid: connection id
1169  * @hcrc: header digest enabled
1170  * @dcrc: data digest enabled
1171  * @reply: request reply from h/w
1172  * set up the iscsi digest settings for a connection identified by tid
1173  */
1174 static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
1175                              int hcrc, int dcrc, int reply)
1176 {
1177         struct sk_buff *skb = alloc_wr(sizeof(struct cpl_set_tcb_field), 0,
1178                                         GFP_KERNEL);
1179         struct cpl_set_tcb_field *req;
1180         u64 val = (hcrc ? 1 : 0) | (dcrc ? 2 : 0);
1181
1182         log_debug(1 << CXGBI_DBG_DDP,
1183                 "csk 0x%p, tid %u, crc %d,%d.\n", csk, tid, hcrc, dcrc);
1184         if (!skb)
1185                 return -ENOMEM;
1186
1187         /* set up ulp submode and page size */
1188         req = (struct cpl_set_tcb_field *)skb->head;
1189         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
1190         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1191         req->reply = V_NO_REPLY(reply ? 0 : 1);
1192         req->cpu_idx = 0;
1193         req->word = htons(31);
1194         req->mask = cpu_to_be64(0x0F000000);
1195         req->val = cpu_to_be64(val << 24);
1196         skb->priority = CPL_PRIORITY_CONTROL;
1197
1198         cxgb3_ofld_send(csk->cdev->lldev, skb);
1199         return 0;
1200 }
1201
1202 /**
1203  * t3_ddp_cleanup - release the cxgb3 adapter's ddp resource
1204  * @cdev: cxgb3i adapter
1205  * release all the resource held by the ddp pagepod manager for a given
1206  * adapter if needed
1207  */
1208
1209 static void t3_ddp_cleanup(struct cxgbi_device *cdev)
1210 {
1211         struct t3cdev *tdev = (struct t3cdev *)cdev->lldev;
1212
1213         if (cxgbi_ddp_cleanup(cdev)) {
1214                 pr_info("t3dev 0x%p, ulp_iscsi no more user.\n", tdev);
1215                 tdev->ulp_iscsi = NULL;
1216         }
1217 }
1218
1219 /**
1220  * ddp_init - initialize the cxgb3 adapter's ddp resource
1221  * @cdev: cxgb3i adapter
1222  * initialize the ddp pagepod manager for a given adapter
1223  */
1224 static int cxgb3i_ddp_init(struct cxgbi_device *cdev)
1225 {
1226         struct t3cdev *tdev = (struct t3cdev *)cdev->lldev;
1227         struct cxgbi_ddp_info *ddp = tdev->ulp_iscsi;
1228         struct ulp_iscsi_info uinfo;
1229         unsigned int pgsz_factor[4];
1230         int i, err;
1231
1232         if (ddp) {
1233                 kref_get(&ddp->refcnt);
1234                 pr_warn("t3dev 0x%p, ddp 0x%p already set up.\n",
1235                         tdev, tdev->ulp_iscsi);
1236                 cdev->ddp = ddp;
1237                 return -EALREADY;
1238         }
1239
1240         err = tdev->ctl(tdev, ULP_ISCSI_GET_PARAMS, &uinfo);
1241         if (err < 0) {
1242                 pr_err("%s, failed to get iscsi param err=%d.\n",
1243                          tdev->name, err);
1244                 return err;
1245         }
1246
1247         err = cxgbi_ddp_init(cdev, uinfo.llimit, uinfo.ulimit,
1248                         uinfo.max_txsz, uinfo.max_rxsz);
1249         if (err < 0)
1250                 return err;
1251
1252         ddp = cdev->ddp;
1253
1254         uinfo.tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
1255         cxgbi_ddp_page_size_factor(pgsz_factor);
1256         for (i = 0; i < 4; i++)
1257                 uinfo.pgsz_factor[i] = pgsz_factor[i];
1258         uinfo.ulimit = uinfo.llimit + (ddp->nppods << PPOD_SIZE_SHIFT);
1259
1260         err = tdev->ctl(tdev, ULP_ISCSI_SET_PARAMS, &uinfo);
1261         if (err < 0) {
1262                 pr_warn("%s unable to set iscsi param err=%d, ddp disabled.\n",
1263                         tdev->name, err);
1264                 cxgbi_ddp_cleanup(cdev);
1265                 return err;
1266         }
1267         tdev->ulp_iscsi = ddp;
1268
1269         cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
1270         cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
1271         cdev->csk_ddp_set = ddp_set_map;
1272         cdev->csk_ddp_clear = ddp_clear_map;
1273
1274         pr_info("tdev 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u, "
1275                 "%u/%u.\n",
1276                 tdev, ddp->nppods, ddp->idx_bits, ddp->idx_mask,
1277                 ddp->rsvd_tag_mask, ddp->max_txsz, uinfo.max_txsz,
1278                 ddp->max_rxsz, uinfo.max_rxsz);
1279         return 0;
1280 }
1281
1282 static void cxgb3i_dev_close(struct t3cdev *t3dev)
1283 {
1284         struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
1285
1286         if (!cdev || cdev->flags & CXGBI_FLAG_ADAPTER_RESET) {
1287                 pr_info("0x%p close, f 0x%x.\n", cdev, cdev ? cdev->flags : 0);
1288                 return;
1289         }
1290
1291         cxgbi_device_unregister(cdev);
1292 }
1293
1294 /**
1295  * cxgb3i_dev_open - init a t3 adapter structure and any h/w settings
1296  * @t3dev: t3cdev adapter
1297  */
1298 static void cxgb3i_dev_open(struct t3cdev *t3dev)
1299 {
1300         struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
1301         struct adapter *adapter = tdev2adap(t3dev);
1302         int i, err;
1303
1304         if (cdev) {
1305                 pr_info("0x%p, updating.\n", cdev);
1306                 return;
1307         }
1308
1309         cdev = cxgbi_device_register(0, adapter->params.nports);
1310         if (!cdev) {
1311                 pr_warn("device 0x%p register failed.\n", t3dev);
1312                 return;
1313         }
1314
1315         cdev->flags = CXGBI_FLAG_DEV_T3 | CXGBI_FLAG_IPV4_SET;
1316         cdev->lldev = t3dev;
1317         cdev->pdev = adapter->pdev;
1318         cdev->ports = adapter->port;
1319         cdev->nports = adapter->params.nports;
1320         cdev->mtus = adapter->params.mtus;
1321         cdev->nmtus = NMTUS;
1322         cdev->snd_win = cxgb3i_snd_win;
1323         cdev->rcv_win = cxgb3i_rcv_win;
1324         cdev->rx_credit_thres = cxgb3i_rx_credit_thres;
1325         cdev->skb_tx_rsvd = CXGB3I_TX_HEADER_LEN;
1326         cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr_norss);
1327         cdev->dev_ddp_cleanup = t3_ddp_cleanup;
1328         cdev->itp = &cxgb3i_iscsi_transport;
1329
1330         err = cxgb3i_ddp_init(cdev);
1331         if (err) {
1332                 pr_info("0x%p ddp init failed\n", cdev);
1333                 goto err_out;
1334         }
1335
1336         err = cxgb3i_ofld_init(cdev);
1337         if (err) {
1338                 pr_info("0x%p offload init failed\n", cdev);
1339                 goto err_out;
1340         }
1341
1342         err = cxgbi_hbas_add(cdev, CXGB3I_MAX_LUN, CXGBI_MAX_CONN,
1343                                 &cxgb3i_host_template, cxgb3i_stt);
1344         if (err)
1345                 goto err_out;
1346
1347         for (i = 0; i < cdev->nports; i++)
1348                 cdev->hbas[i]->ipv4addr =
1349                         cxgb3i_get_private_ipv4addr(cdev->ports[i]);
1350
1351         pr_info("cdev 0x%p, f 0x%x, t3dev 0x%p open, err %d.\n",
1352                 cdev, cdev ? cdev->flags : 0, t3dev, err);
1353         return;
1354
1355 err_out:
1356         cxgbi_device_unregister(cdev);
1357 }
1358
1359 static void cxgb3i_dev_event_handler(struct t3cdev *t3dev, u32 event, u32 port)
1360 {
1361         struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
1362
1363         log_debug(1 << CXGBI_DBG_TOE,
1364                 "0x%p, cdev 0x%p, event 0x%x, port 0x%x.\n",
1365                 t3dev, cdev, event, port);
1366         if (!cdev)
1367                 return;
1368
1369         switch (event) {
1370         case OFFLOAD_STATUS_DOWN:
1371                 cdev->flags |= CXGBI_FLAG_ADAPTER_RESET;
1372                 break;
1373         case OFFLOAD_STATUS_UP:
1374                 cdev->flags &= ~CXGBI_FLAG_ADAPTER_RESET;
1375                 break;
1376         }
1377 }
1378
1379 /**
1380  * cxgb3i_init_module - module init entry point
1381  *
1382  * initialize any driver wide global data structures and register itself
1383  *      with the cxgb3 module
1384  */
1385 static int __init cxgb3i_init_module(void)
1386 {
1387         int rc;
1388
1389         printk(KERN_INFO "%s", version);
1390
1391         rc = cxgbi_iscsi_init(&cxgb3i_iscsi_transport, &cxgb3i_stt);
1392         if (rc < 0)
1393                 return rc;
1394
1395         cxgb3_register_client(&t3_client);
1396         return 0;
1397 }
1398
1399 /**
1400  * cxgb3i_exit_module - module cleanup/exit entry point
1401  *
1402  * go through the driver hba list and for each hba, release any resource held.
1403  *      and unregisters iscsi transport and the cxgb3 module
1404  */
1405 static void __exit cxgb3i_exit_module(void)
1406 {
1407         cxgb3_unregister_client(&t3_client);
1408         cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T3);
1409         cxgbi_iscsi_cleanup(&cxgb3i_iscsi_transport, &cxgb3i_stt);
1410 }
1411
1412 module_init(cxgb3i_init_module);
1413 module_exit(cxgb3i_exit_module);