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         .param_mask     = ISCSI_MAX_RECV_DLENGTH | ISCSI_MAX_XMIT_DLENGTH |
 109                                 ISCSI_HDRDGST_EN | ISCSI_DATADGST_EN |
 110                                 ISCSI_INITIAL_R2T_EN | ISCSI_MAX_R2T |
 111                                 ISCSI_IMM_DATA_EN | ISCSI_FIRST_BURST |
 112                                 ISCSI_MAX_BURST | ISCSI_PDU_INORDER_EN |
 113                                 ISCSI_DATASEQ_INORDER_EN | ISCSI_ERL |
 114                                 ISCSI_CONN_PORT | ISCSI_CONN_ADDRESS |
 115                                 ISCSI_EXP_STATSN | ISCSI_PERSISTENT_PORT |
 116                                 ISCSI_PERSISTENT_ADDRESS |
 117                                 ISCSI_TARGET_NAME | ISCSI_TPGT |
 118                                 ISCSI_USERNAME | ISCSI_PASSWORD |
 119                                 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
 120                                 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
 121                                 ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
 122                                 ISCSI_PING_TMO | ISCSI_RECV_TMO |
 123                                 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
 124         .host_param_mask        = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
 125                                 ISCSI_HOST_INITIATOR_NAME |
 126                                 ISCSI_HOST_NETDEV_NAME,
 127         .get_host_param = cxgbi_get_host_param,
 128         .set_host_param = cxgbi_set_host_param,
 129         /* session management */
 130         .create_session = cxgbi_create_session,
 131         .destroy_session        = cxgbi_destroy_session,
 132         .get_session_param = iscsi_session_get_param,
 133         /* connection management */
 134         .create_conn    = cxgbi_create_conn,
 135         .bind_conn      = cxgbi_bind_conn,
 136         .destroy_conn   = iscsi_tcp_conn_teardown,
 137         .start_conn     = iscsi_conn_start,
 138         .stop_conn      = iscsi_conn_stop,
 139         .get_conn_param = iscsi_conn_get_param,
 140         .set_param      = cxgbi_set_conn_param,
 141         .get_stats      = cxgbi_get_conn_stats,
 142         /* pdu xmit req from user space */
 143         .send_pdu       = iscsi_conn_send_pdu,
 144         /* task */
 145         .init_task      = iscsi_tcp_task_init,
 146         .xmit_task      = iscsi_tcp_task_xmit,
 147         .cleanup_task   = cxgbi_cleanup_task,
 148         /* pdu */
 149         .alloc_pdu      = cxgbi_conn_alloc_pdu,
 150         .init_pdu       = cxgbi_conn_init_pdu,
 151         .xmit_pdu       = cxgbi_conn_xmit_pdu,
 152         .parse_pdu_itt  = cxgbi_parse_pdu_itt,
 153         /* TCP connect/disconnect */
 154         .get_ep_param   = cxgbi_get_ep_param,
 155         .ep_connect     = cxgbi_ep_connect,
 156         .ep_poll        = cxgbi_ep_poll,
 157         .ep_disconnect  = cxgbi_ep_disconnect,
 158         /* Error recovery timeout call */
 159         .session_recovery_timedout = iscsi_session_recovery_timedout,
 160 };
 161
 162 static struct scsi_transport_template *cxgb3i_stt;
 163
 164 /*
 165  * CPL (Chelsio Protocol Language) defines a message passing interface between
 166  * the host driver and Chelsio asic.
 167  * The section below implments CPLs that related to iscsi tcp connection
 168  * open/close/abort and data send/receive.
 169  */
 170
 171 static int push_tx_frames(struct cxgbi_sock *csk, int req_completion);
 172
 173 static void send_act_open_req(struct cxgbi_sock *csk, struct sk_buff *skb,
 174                               const struct l2t_entry *e)
 175 {
 176         unsigned int wscale = cxgbi_sock_compute_wscale(cxgb3i_rcv_win);
 177         struct cpl_act_open_req *req = (struct cpl_act_open_req *)skb->head;
 178
 179         skb->priority = CPL_PRIORITY_SETUP;
 180
 181         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 182         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, csk->atid));
 183         req->local_port = csk->saddr.sin_port;
 184         req->peer_port = csk->daddr.sin_port;
 185         req->local_ip = csk->saddr.sin_addr.s_addr;
 186         req->peer_ip = csk->daddr.sin_addr.s_addr;
 187
 188         req->opt0h = htonl(V_KEEP_ALIVE(1) | F_TCAM_BYPASS |
 189                         V_WND_SCALE(wscale) | V_MSS_IDX(csk->mss_idx) |
 190                         V_L2T_IDX(e->idx) | V_TX_CHANNEL(e->smt_idx));
 191         req->opt0l = htonl(V_ULP_MODE(ULP2_MODE_ISCSI) |
 192                         V_RCV_BUFSIZ(cxgb3i_rcv_win>>10));
 193
 194         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 195                 "csk 0x%p,%u,0x%lx,%u, %pI4:%u-%pI4:%u, %u,%u,%u.\n",
 196                 csk, csk->state, csk->flags, csk->atid,
 197                 &req->local_ip, ntohs(req->local_port),
 198                 &req->peer_ip, ntohs(req->peer_port),
 199                 csk->mss_idx, e->idx, e->smt_idx);
 200
 201         l2t_send(csk->cdev->lldev, skb, csk->l2t);
 202 }
 203
 204 static inline void act_open_arp_failure(struct t3cdev *dev, struct sk_buff *skb)
 205 {
 206         cxgbi_sock_act_open_req_arp_failure(NULL, skb);
 207 }
 208
 209 /*
 210  * CPL connection close request: host ->
 211  *
 212  * Close a connection by sending a CPL_CLOSE_CON_REQ message and queue it to
 213  * the write queue (i.e., after any unsent txt data).
 214  */
 215 static void send_close_req(struct cxgbi_sock *csk)
 216 {
 217         struct sk_buff *skb = csk->cpl_close;
 218         struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
 219         unsigned int tid = csk->tid;
 220
 221         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 222                 "csk 0x%p,%u,0x%lx,%u.\n",
 223                 csk, csk->state, csk->flags, csk->tid);
 224
 225         csk->cpl_close = NULL;
 226         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_CLOSE_CON));
 227         req->wr.wr_lo = htonl(V_WR_TID(tid));
 228         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
 229         req->rsvd = htonl(csk->write_seq);
 230
 231         cxgbi_sock_skb_entail(csk, skb);
 232         if (csk->state >= CTP_ESTABLISHED)
 233                 push_tx_frames(csk, 1);
 234 }
 235
 236 /*
 237  * CPL connection abort request: host ->
 238  *
 239  * Send an ABORT_REQ message. Makes sure we do not send multiple ABORT_REQs
 240  * for the same connection and also that we do not try to send a message
 241  * after the connection has closed.
 242  */
 243 static void abort_arp_failure(struct t3cdev *tdev, struct sk_buff *skb)
 244 {
 245         struct cpl_abort_req *req = cplhdr(skb);
 246
 247         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 248                 "t3dev 0x%p, tid %u, skb 0x%p.\n",
 249                 tdev, GET_TID(req), skb);
 250         req->cmd = CPL_ABORT_NO_RST;
 251         cxgb3_ofld_send(tdev, skb);
 252 }
 253
 254 static void send_abort_req(struct cxgbi_sock *csk)
 255 {
 256         struct sk_buff *skb = csk->cpl_abort_req;
 257         struct cpl_abort_req *req;
 258
 259         if (unlikely(csk->state == CTP_ABORTING || !skb))
 260                 return;
 261         cxgbi_sock_set_state(csk, CTP_ABORTING);
 262         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
 263         /* Purge the send queue so we don't send anything after an abort. */
 264         cxgbi_sock_purge_write_queue(csk);
 265
 266         csk->cpl_abort_req = NULL;
 267         req = (struct cpl_abort_req *)skb->head;
 268         skb->priority = CPL_PRIORITY_DATA;
 269         set_arp_failure_handler(skb, abort_arp_failure);
 270         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_REQ));
 271         req->wr.wr_lo = htonl(V_WR_TID(csk->tid));
 272         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
 273         req->rsvd0 = htonl(csk->snd_nxt);
 274         req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);
 275         req->cmd = CPL_ABORT_SEND_RST;
 276
 277         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 278                 "csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
 279                 csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
 280                 req->rsvd1);
 281
 282         l2t_send(csk->cdev->lldev, skb, csk->l2t);
 283 }
 284
 285 /*
 286  * CPL connection abort reply: host ->
 287  *
 288  * Send an ABORT_RPL message in response of the ABORT_REQ received.
 289  */
 290 static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
 291 {
 292         struct sk_buff *skb = csk->cpl_abort_rpl;
 293         struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
 294
 295         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 296                 "csk 0x%p,%u,0x%lx,%u, status %d.\n",
 297                 csk, csk->state, csk->flags, csk->tid, rst_status);
 298
 299         csk->cpl_abort_rpl = NULL;
 300         skb->priority = CPL_PRIORITY_DATA;
 301         rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
 302         rpl->wr.wr_lo = htonl(V_WR_TID(csk->tid));
 303         OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
 304         rpl->cmd = rst_status;
 305         cxgb3_ofld_send(csk->cdev->lldev, skb);
 306 }
 307
 308 /*
 309  * CPL connection rx data ack: host ->
 310  * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
 311  * credits sent.
 312  */
 313 static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
 314 {
 315         struct sk_buff *skb;
 316         struct cpl_rx_data_ack *req;
 317         u32 dack = F_RX_DACK_CHANGE | V_RX_DACK_MODE(1);
 318
 319         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 320                 "csk 0x%p,%u,0x%lx,%u, credit %u, dack %u.\n",
 321                 csk, csk->state, csk->flags, csk->tid, credits, dack);
 322
 323         skb = alloc_wr(sizeof(*req), 0, GFP_ATOMIC);
 324         if (!skb) {
 325                 pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
 326                 return 0;
 327         }
 328         req = (struct cpl_rx_data_ack *)skb->head;
 329         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 330         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_RX_DATA_ACK, csk->tid));
 331         req->credit_dack = htonl(F_RX_DACK_CHANGE | V_RX_DACK_MODE(1) |
 332                                 V_RX_CREDITS(credits));
 333         skb->priority = CPL_PRIORITY_ACK;
 334         cxgb3_ofld_send(csk->cdev->lldev, skb);
 335         return credits;
 336 }
 337
 338 /*
 339  * CPL connection tx data: host ->
 340  *
 341  * Send iscsi PDU via TX_DATA CPL message. Returns the number of
 342  * credits sent.
 343  * Each TX_DATA consumes work request credit (wrs), so we need to keep track of
 344  * how many we've used so far and how many are pending (i.e., yet ack'ed by T3).
 345  */
 346
 347 static unsigned int wrlen __read_mostly;
 348 static unsigned int skb_wrs[SKB_WR_LIST_SIZE] __read_mostly;
 349
 350 static void init_wr_tab(unsigned int wr_len)
 351 {
 352         int i;
 353
 354         if (skb_wrs[1])         /* already initialized */
 355                 return;
 356         for (i = 1; i < SKB_WR_LIST_SIZE; i++) {
 357                 int sgl_len = (3 * i) / 2 + (i & 1);
 358
 359                 sgl_len += 3;
 360                 skb_wrs[i] = (sgl_len <= wr_len
 361                               ? 1 : 1 + (sgl_len - 2) / (wr_len - 1));
 362         }
 363         wrlen = wr_len * 8;
 364 }
 365
 366 static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
 367                                    int len, int req_completion)
 368 {
 369         struct tx_data_wr *req;
 370         struct l2t_entry *l2t = csk->l2t;
 371
 372         skb_reset_transport_header(skb);
 373         req = (struct tx_data_wr *)__skb_push(skb, sizeof(*req));
 374         req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA) |
 375                         (req_completion ? F_WR_COMPL : 0));
 376         req->wr_lo = htonl(V_WR_TID(csk->tid));
 377         /* len includes the length of any HW ULP additions */
 378         req->len = htonl(len);
 379         /* V_TX_ULP_SUBMODE sets both the mode and submode */
 380         req->flags = htonl(V_TX_ULP_SUBMODE(cxgbi_skcb_ulp_mode(skb)) |
 381                            V_TX_SHOVE((skb_peek(&csk->write_queue) ? 0 : 1)));
 382         req->sndseq = htonl(csk->snd_nxt);
 383         req->param = htonl(V_TX_PORT(l2t->smt_idx));
 384
 385         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
 386                 req->flags |= htonl(V_TX_ACK_PAGES(2) | F_TX_INIT |
 387                                     V_TX_CPU_IDX(csk->rss_qid));
 388                 /* sendbuffer is in units of 32KB. */
 389                 req->param |= htonl(V_TX_SNDBUF(cxgb3i_snd_win >> 15));
 390                 cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
 391         }
 392 }
 393
 394 /**
 395  * push_tx_frames -- start transmit
 396  * @c3cn: the offloaded connection
 397  * @req_completion: request wr_ack or not
 398  *
 399  * Prepends TX_DATA_WR or CPL_CLOSE_CON_REQ headers to buffers waiting in a
 400  * connection's send queue and sends them on to T3.  Must be called with the
 401  * connection's lock held.  Returns the amount of send buffer space that was
 402  * freed as a result of sending queued data to T3.
 403  */
 404
 405 static void arp_failure_skb_discard(struct t3cdev *dev, struct sk_buff *skb)
 406 {
 407         kfree_skb(skb);
 408 }
 409
 410 static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
 411 {
 412         int total_size = 0;
 413         struct sk_buff *skb;
 414
 415         if (unlikely(csk->state < CTP_ESTABLISHED ||
 416                 csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
 417                         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
 418                                 "csk 0x%p,%u,0x%lx,%u, in closing state.\n",
 419                                 csk, csk->state, csk->flags, csk->tid);
 420                 return 0;
 421         }
 422
 423         while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
 424                 int len = skb->len;     /* length before skb_push */
 425                 int frags = skb_shinfo(skb)->nr_frags + (len != skb->data_len);
 426                 int wrs_needed = skb_wrs[frags];
 427
 428                 if (wrs_needed > 1 && len + sizeof(struct tx_data_wr) <= wrlen)
 429                         wrs_needed = 1;
 430
 431                 WARN_ON(frags >= SKB_WR_LIST_SIZE || wrs_needed < 1);
 432
 433                 if (csk->wr_cred < wrs_needed) {
 434                         log_debug(1 << CXGBI_DBG_PDU_TX,
 435                                 "csk 0x%p, skb len %u/%u, frag %u, wr %d<%u.\n",
 436                                 csk, skb->len, skb->data_len, frags,
 437                                 wrs_needed, csk->wr_cred);
 438                         break;
 439                 }
 440
 441                 __skb_unlink(skb, &csk->write_queue);
 442                 skb->priority = CPL_PRIORITY_DATA;
 443                 skb->csum = wrs_needed; /* remember this until the WR_ACK */
 444                 csk->wr_cred -= wrs_needed;
 445                 csk->wr_una_cred += wrs_needed;
 446                 cxgbi_sock_enqueue_wr(csk, skb);
 447
 448                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
 449                         "csk 0x%p, enqueue, skb len %u/%u, frag %u, wr %d, "
 450                         "left %u, unack %u.\n",
 451                         csk, skb->len, skb->data_len, frags, skb->csum,
 452                         csk->wr_cred, csk->wr_una_cred);
 453
 454                 if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
 455                         if ((req_completion &&
 456                                 csk->wr_una_cred == wrs_needed) ||
 457                              csk->wr_una_cred >= csk->wr_max_cred / 2) {
 458                                 req_completion = 1;
 459                                 csk->wr_una_cred = 0;
 460                         }
 461                         len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
 462                         make_tx_data_wr(csk, skb, len, req_completion);
 463                         csk->snd_nxt += len;
 464                         cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
 465                 }
 466                 total_size += skb->truesize;
 467                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
 468                         "csk 0x%p, tid 0x%x, send skb 0x%p.\n",
 469                         csk, csk->tid, skb);
 470                 set_arp_failure_handler(skb, arp_failure_skb_discard);
 471                 l2t_send(csk->cdev->lldev, skb, csk->l2t);
 472         }
 473         return total_size;
 474 }
 475
 476 /*
 477  * Process a CPL_ACT_ESTABLISH message: -> host
 478  * Updates connection state from an active establish CPL message.  Runs with
 479  * the connection lock held.
 480  */
 481
 482 static inline void free_atid(struct cxgbi_sock *csk)
 483 {
 484         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
 485                 cxgb3_free_atid(csk->cdev->lldev, csk->atid);
 486                 cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
 487                 cxgbi_sock_put(csk);
 488         }
 489 }
 490
 491 static int do_act_establish(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
 492 {
 493         struct cxgbi_sock *csk = ctx;
 494         struct cpl_act_establish *req = cplhdr(skb);
 495         unsigned int tid = GET_TID(req);
 496         unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
 497         u32 rcv_isn = ntohl(req->rcv_isn);      /* real RCV_ISN + 1 */
 498
 499         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 500                 "atid 0x%x,tid 0x%x, csk 0x%p,%u,0x%lx, isn %u.\n",
 501                 atid, atid, csk, csk->state, csk->flags, rcv_isn);
 502
 503         cxgbi_sock_get(csk);
 504         cxgbi_sock_set_flag(csk, CTPF_HAS_TID);
 505         csk->tid = tid;
 506         cxgb3_insert_tid(csk->cdev->lldev, &t3_client, csk, tid);
 507
 508         free_atid(csk);
 509
 510         csk->rss_qid = G_QNUM(ntohs(skb->csum));
 511
 512         spin_lock_bh(&csk->lock);
 513         if (csk->retry_timer.function) {
 514                 del_timer(&csk->retry_timer);
 515                 csk->retry_timer.function = NULL;
 516         }
 517
 518         if (unlikely(csk->state != CTP_ACTIVE_OPEN))
 519                 pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
 520                         csk, csk->state, csk->flags, csk->tid);
 521
 522         csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
 523         if (cxgb3i_rcv_win > (M_RCV_BUFSIZ << 10))
 524                 csk->rcv_wup -= cxgb3i_rcv_win - (M_RCV_BUFSIZ << 10);
 525
 526         cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));
 527
 528         if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
 529                 /* upper layer has requested closing */
 530                 send_abort_req(csk);
 531         else {
 532                 if (skb_queue_len(&csk->write_queue))
 533                         push_tx_frames(csk, 1);
 534                 cxgbi_conn_tx_open(csk);
 535         }
 536
 537         spin_unlock_bh(&csk->lock);
 538         __kfree_skb(skb);
 539         return 0;
 540 }
 541
 542 /*
 543  * Process a CPL_ACT_OPEN_RPL message: -> host
 544  * Handle active open failures.
 545  */
 546 static int act_open_rpl_status_to_errno(int status)
 547 {
 548         switch (status) {
 549         case CPL_ERR_CONN_RESET:
 550                 return -ECONNREFUSED;
 551         case CPL_ERR_ARP_MISS:
 552                 return -EHOSTUNREACH;
 553         case CPL_ERR_CONN_TIMEDOUT:
 554                 return -ETIMEDOUT;
 555         case CPL_ERR_TCAM_FULL:
 556                 return -ENOMEM;
 557         case CPL_ERR_CONN_EXIST:
 558                 return -EADDRINUSE;
 559         default:
 560                 return -EIO;
 561         }
 562 }
 563
 564 static void act_open_retry_timer(unsigned long data)
 565 {
 566         struct sk_buff *skb;
 567         struct cxgbi_sock *csk = (struct cxgbi_sock *)data;
 568
 569         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 570                 "csk 0x%p,%u,0x%lx,%u.\n",
 571                 csk, csk->state, csk->flags, csk->tid);
 572
 573         cxgbi_sock_get(csk);
 574         spin_lock_bh(&csk->lock);
 575         skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_ATOMIC);
 576         if (!skb)
 577                 cxgbi_sock_fail_act_open(csk, -ENOMEM);
 578         else {
 579                 skb->sk = (struct sock *)csk;
 580                 set_arp_failure_handler(skb, act_open_arp_failure);
 581                 send_act_open_req(csk, skb, csk->l2t);
 582         }
 583         spin_unlock_bh(&csk->lock);
 584         cxgbi_sock_put(csk);
 585 }
 586
 587 static int do_act_open_rpl(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
 588 {
 589         struct cxgbi_sock *csk = ctx;
 590         struct cpl_act_open_rpl *rpl = cplhdr(skb);
 591
 592         pr_info("csk 0x%p,%u,0x%lx,%u, status %u, %pI4:%u-%pI4:%u.\n",
 593                 csk, csk->state, csk->flags, csk->atid, rpl->status,
 594                 &csk->saddr.sin_addr.s_addr, ntohs(csk->saddr.sin_port),
 595                 &csk->daddr.sin_addr.s_addr, ntohs(csk->daddr.sin_port));
 596
 597         if (rpl->status != CPL_ERR_TCAM_FULL &&
 598             rpl->status != CPL_ERR_CONN_EXIST &&
 599             rpl->status != CPL_ERR_ARP_MISS)
 600                 cxgb3_queue_tid_release(tdev, GET_TID(rpl));
 601
 602         cxgbi_sock_get(csk);
 603         spin_lock_bh(&csk->lock);
 604         if (rpl->status == CPL_ERR_CONN_EXIST &&
 605             csk->retry_timer.function != act_open_retry_timer) {
 606                 csk->retry_timer.function = act_open_retry_timer;
 607                 mod_timer(&csk->retry_timer, jiffies + HZ / 2);
 608         } else
 609                 cxgbi_sock_fail_act_open(csk,
 610                                 act_open_rpl_status_to_errno(rpl->status));
 611
 612         spin_unlock_bh(&csk->lock);
 613         cxgbi_sock_put(csk);
 614         __kfree_skb(skb);
 615         return 0;
 616 }
 617
 618 /*
 619  * Process PEER_CLOSE CPL messages: -> host
 620  * Handle peer FIN.
 621  */
 622 static int do_peer_close(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
 623 {
 624         struct cxgbi_sock *csk = ctx;
 625
 626         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 627                 "csk 0x%p,%u,0x%lx,%u.\n",
 628                 csk, csk->state, csk->flags, csk->tid);
 629
 630         cxgbi_sock_rcv_peer_close(csk);
 631         __kfree_skb(skb);
 632         return 0;
 633 }
 634
 635 /*
 636  * Process CLOSE_CONN_RPL CPL message: -> host
 637  * Process a peer ACK to our FIN.
 638  */
 639 static int do_close_con_rpl(struct t3cdev *cdev, struct sk_buff *skb,
 640                             void *ctx)
 641 {
 642         struct cxgbi_sock *csk = ctx;
 643         struct cpl_close_con_rpl *rpl = cplhdr(skb);
 644
 645         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 646                 "csk 0x%p,%u,0x%lx,%u, snxt %u.\n",
 647                 csk, csk->state, csk->flags, csk->tid, ntohl(rpl->snd_nxt));
 648
 649         cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
 650         __kfree_skb(skb);
 651         return 0;
 652 }
 653
 654 /*
 655  * Process ABORT_REQ_RSS CPL message: -> host
 656  * Process abort requests.  If we are waiting for an ABORT_RPL we ignore this
 657  * request except that we need to reply to it.
 658  */
 659
 660 static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
 661                                  int *need_rst)
 662 {
 663         switch (abort_reason) {
 664         case CPL_ERR_BAD_SYN: /* fall through */
 665         case CPL_ERR_CONN_RESET:
 666                 return csk->state > CTP_ESTABLISHED ? -EPIPE : -ECONNRESET;
 667         case CPL_ERR_XMIT_TIMEDOUT:
 668         case CPL_ERR_PERSIST_TIMEDOUT:
 669         case CPL_ERR_FINWAIT2_TIMEDOUT:
 670         case CPL_ERR_KEEPALIVE_TIMEDOUT:
 671                 return -ETIMEDOUT;
 672         default:
 673                 return -EIO;
 674         }
 675 }
 676
 677 static int do_abort_req(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
 678 {
 679         const struct cpl_abort_req_rss *req = cplhdr(skb);
 680         struct cxgbi_sock *csk = ctx;
 681         int rst_status = CPL_ABORT_NO_RST;
 682
 683         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 684                 "csk 0x%p,%u,0x%lx,%u.\n",
 685                 csk, csk->state, csk->flags, csk->tid);
 686
 687         if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
 688             req->status == CPL_ERR_PERSIST_NEG_ADVICE) {
 689                 goto done;
 690         }
 691
 692         cxgbi_sock_get(csk);
 693         spin_lock_bh(&csk->lock);
 694
 695         if (!cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) {
 696                 cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
 697                 cxgbi_sock_set_state(csk, CTP_ABORTING);
 698                 goto out;
 699         }
 700
 701         cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
 702         send_abort_rpl(csk, rst_status);
 703
 704         if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 705                 csk->err = abort_status_to_errno(csk, req->status, &rst_status);
 706                 cxgbi_sock_closed(csk);
 707         }
 708
 709 out:
 710         spin_unlock_bh(&csk->lock);
 711         cxgbi_sock_put(csk);
 712 done:
 713         __kfree_skb(skb);
 714         return 0;
 715 }
 716
 717 /*
 718  * Process ABORT_RPL_RSS CPL message: -> host
 719  * Process abort replies.  We only process these messages if we anticipate
 720  * them as the coordination between SW and HW in this area is somewhat lacking
 721  * and sometimes we get ABORT_RPLs after we are done with the connection that
 722  * originated the ABORT_REQ.
 723  */
 724 static int do_abort_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
 725 {
 726         struct cpl_abort_rpl_rss *rpl = cplhdr(skb);
 727         struct cxgbi_sock *csk = ctx;
 728
 729         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 730                 "status 0x%x, csk 0x%p, s %u, 0x%lx.\n",
 731                 rpl->status, csk, csk ? csk->state : 0,
 732                 csk ? csk->flags : 0UL);
 733         /*
 734          * Ignore replies to post-close aborts indicating that the abort was
 735          * requested too late.  These connections are terminated when we get
 736          * PEER_CLOSE or CLOSE_CON_RPL and by the time the abort_rpl_rss
 737          * arrives the TID is either no longer used or it has been recycled.
 738          */
 739         if (rpl->status == CPL_ERR_ABORT_FAILED)
 740                 goto rel_skb;
 741         /*
 742          * Sometimes we've already closed the connection, e.g., a post-close
 743          * abort races with ABORT_REQ_RSS, the latter frees the connection
 744          * expecting the ABORT_REQ will fail with CPL_ERR_ABORT_FAILED,
 745          * but FW turns the ABORT_REQ into a regular one and so we get
 746          * ABORT_RPL_RSS with status 0 and no connection.
 747          */
 748         if (csk)
 749                 cxgbi_sock_rcv_abort_rpl(csk);
 750 rel_skb:
 751         __kfree_skb(skb);
 752         return 0;
 753 }
 754
 755 /*
 756  * Process RX_ISCSI_HDR CPL message: -> host
 757  * Handle received PDUs, the payload could be DDP'ed. If not, the payload
 758  * follow after the bhs.
 759  */
 760 static int do_iscsi_hdr(struct t3cdev *t3dev, struct sk_buff *skb, void *ctx)
 761 {
 762         struct cxgbi_sock *csk = ctx;
 763         struct cpl_iscsi_hdr *hdr_cpl = cplhdr(skb);
 764         struct cpl_iscsi_hdr_norss data_cpl;
 765         struct cpl_rx_data_ddp_norss ddp_cpl;
 766         unsigned int hdr_len, data_len, status;
 767         unsigned int len;
 768         int err;
 769
 770         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 771                 "csk 0x%p,%u,0x%lx,%u, skb 0x%p,%u.\n",
 772                 csk, csk->state, csk->flags, csk->tid, skb, skb->len);
 773
 774         spin_lock_bh(&csk->lock);
 775
 776         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
 777                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 778                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
 779                         csk, csk->state, csk->flags, csk->tid);
 780                 if (csk->state != CTP_ABORTING)
 781                         goto abort_conn;
 782                 else
 783                         goto discard;
 784         }
 785
 786         cxgbi_skcb_tcp_seq(skb) = ntohl(hdr_cpl->seq);
 787         cxgbi_skcb_flags(skb) = 0;
 788
 789         skb_reset_transport_header(skb);
 790         __skb_pull(skb, sizeof(struct cpl_iscsi_hdr));
 791
 792         len = hdr_len = ntohs(hdr_cpl->len);
 793         /* msg coalesce is off or not enough data received */
 794         if (skb->len <= hdr_len) {
 795                 pr_err("%s: tid %u, CPL_ISCSI_HDR, skb len %u < %u.\n",
 796                         csk->cdev->ports[csk->port_id]->name, csk->tid,
 797                         skb->len, hdr_len);
 798                 goto abort_conn;
 799         }
 800         cxgbi_skcb_set_flag(skb, SKCBF_RX_COALESCED);
 801
 802         err = skb_copy_bits(skb, skb->len - sizeof(ddp_cpl), &ddp_cpl,
 803                             sizeof(ddp_cpl));
 804         if (err < 0) {
 805                 pr_err("%s: tid %u, copy cpl_ddp %u-%zu failed %d.\n",
 806                         csk->cdev->ports[csk->port_id]->name, csk->tid,
 807                         skb->len, sizeof(ddp_cpl), err);
 808                 goto abort_conn;
 809         }
 810
 811         cxgbi_skcb_set_flag(skb, SKCBF_RX_STATUS);
 812         cxgbi_skcb_rx_pdulen(skb) = ntohs(ddp_cpl.len);
 813         cxgbi_skcb_rx_ddigest(skb) = ntohl(ddp_cpl.ulp_crc);
 814         status = ntohl(ddp_cpl.ddp_status);
 815
 816         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 817                 "csk 0x%p, skb 0x%p,%u, pdulen %u, status 0x%x.\n",
 818                 csk, skb, skb->len, cxgbi_skcb_rx_pdulen(skb), status);
 819
 820         if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT))
 821                 cxgbi_skcb_set_flag(skb, SKCBF_RX_HCRC_ERR);
 822         if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT))
 823                 cxgbi_skcb_set_flag(skb, SKCBF_RX_DCRC_ERR);
 824         if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT))
 825                 cxgbi_skcb_set_flag(skb, SKCBF_RX_PAD_ERR);
 826
 827         if (skb->len > (hdr_len + sizeof(ddp_cpl))) {
 828                 err = skb_copy_bits(skb, hdr_len, &data_cpl, sizeof(data_cpl));
 829                 if (err < 0) {
 830                         pr_err("%s: tid %u, cp %zu/%u failed %d.\n",
 831                                 csk->cdev->ports[csk->port_id]->name,
 832                                 csk->tid, sizeof(data_cpl), skb->len, err);
 833                         goto abort_conn;
 834                 }
 835                 data_len = ntohs(data_cpl.len);
 836                 log_debug(1 << CXGBI_DBG_DDP | 1 << CXGBI_DBG_PDU_RX,
 837                         "skb 0x%p, pdu not ddp'ed %u/%u, status 0x%x.\n",
 838                         skb, data_len, cxgbi_skcb_rx_pdulen(skb), status);
 839                 len += sizeof(data_cpl) + data_len;
 840         } else if (status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT))
 841                 cxgbi_skcb_set_flag(skb, SKCBF_RX_DATA_DDPD);
 842
 843         csk->rcv_nxt = ntohl(ddp_cpl.seq) + cxgbi_skcb_rx_pdulen(skb);
 844         __pskb_trim(skb, len);
 845         __skb_queue_tail(&csk->receive_queue, skb);
 846         cxgbi_conn_pdu_ready(csk);
 847
 848         spin_unlock_bh(&csk->lock);
 849         return 0;
 850
 851 abort_conn:
 852         send_abort_req(csk);
 853 discard:
 854         spin_unlock_bh(&csk->lock);
 855         __kfree_skb(skb);
 856         return 0;
 857 }
 858
 859 /*
 860  * Process TX_DATA_ACK CPL messages: -> host
 861  * Process an acknowledgment of WR completion.  Advance snd_una and send the
 862  * next batch of work requests from the write queue.
 863  */
 864 static int do_wr_ack(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
 865 {
 866         struct cxgbi_sock *csk = ctx;
 867         struct cpl_wr_ack *hdr = cplhdr(skb);
 868
 869         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 870                 "csk 0x%p,%u,0x%lx,%u, cr %u.\n",
 871                 csk, csk->state, csk->flags, csk->tid, ntohs(hdr->credits));
 872
 873         cxgbi_sock_rcv_wr_ack(csk, ntohs(hdr->credits), ntohl(hdr->snd_una), 1);
 874         __kfree_skb(skb);
 875         return 0;
 876 }
 877
 878 /*
 879  * for each connection, pre-allocate skbs needed for close/abort requests. So
 880  * that we can service the request right away.
 881  */
 882 static int alloc_cpls(struct cxgbi_sock *csk)
 883 {
 884         csk->cpl_close = alloc_wr(sizeof(struct cpl_close_con_req), 0,
 885                                         GFP_KERNEL);
 886         if (!csk->cpl_close)
 887                 return -ENOMEM;
 888         csk->cpl_abort_req = alloc_wr(sizeof(struct cpl_abort_req), 0,
 889                                         GFP_KERNEL);
 890         if (!csk->cpl_abort_req)
 891                 goto free_cpl_skbs;
 892
 893         csk->cpl_abort_rpl = alloc_wr(sizeof(struct cpl_abort_rpl), 0,
 894                                         GFP_KERNEL);
 895         if (!csk->cpl_abort_rpl)
 896                 goto free_cpl_skbs;
 897
 898         return 0;
 899
 900 free_cpl_skbs:
 901         cxgbi_sock_free_cpl_skbs(csk);
 902         return -ENOMEM;
 903 }
 904
 905 /**
 906  * release_offload_resources - release offload resource
 907  * @c3cn: the offloaded iscsi tcp connection.
 908  * Release resources held by an offload connection (TID, L2T entry, etc.)
 909  */
 910 static void l2t_put(struct cxgbi_sock *csk)
 911 {
 912         struct t3cdev *t3dev = (struct t3cdev *)csk->cdev->lldev;
 913
 914         if (csk->l2t) {
 915                 l2t_release(t3dev, csk->l2t);
 916                 csk->l2t = NULL;
 917                 cxgbi_sock_put(csk);
 918         }
 919 }
 920
 921 static void release_offload_resources(struct cxgbi_sock *csk)
 922 {
 923         struct t3cdev *t3dev = (struct t3cdev *)csk->cdev->lldev;
 924
 925         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 926                 "csk 0x%p,%u,0x%lx,%u.\n",
 927                 csk, csk->state, csk->flags, csk->tid);
 928
 929         csk->rss_qid = 0;
 930         cxgbi_sock_free_cpl_skbs(csk);
 931
 932         if (csk->wr_cred != csk->wr_max_cred) {
 933                 cxgbi_sock_purge_wr_queue(csk);
 934                 cxgbi_sock_reset_wr_list(csk);
 935         }
 936         l2t_put(csk);
 937         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
 938                 free_atid(csk);
 939         else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
 940                 cxgb3_remove_tid(t3dev, (void *)csk, csk->tid);
 941                 cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
 942                 cxgbi_sock_put(csk);
 943         }
 944         csk->dst = NULL;
 945         csk->cdev = NULL;
 946 }
 947
 948 static void update_address(struct cxgbi_hba *chba)
 949 {
 950         if (chba->ipv4addr) {
 951                 if (chba->vdev &&
 952                     chba->ipv4addr != cxgb3i_get_private_ipv4addr(chba->vdev)) {
 953                         cxgb3i_set_private_ipv4addr(chba->vdev, chba->ipv4addr);
 954                         cxgb3i_set_private_ipv4addr(chba->ndev, 0);
 955                         pr_info("%s set %pI4.\n",
 956                                 chba->vdev->name, &chba->ipv4addr);
 957                 } else if (chba->ipv4addr !=
 958                                 cxgb3i_get_private_ipv4addr(chba->ndev)) {
 959                         cxgb3i_set_private_ipv4addr(chba->ndev, chba->ipv4addr);
 960                         pr_info("%s set %pI4.\n",
 961                                 chba->ndev->name, &chba->ipv4addr);
 962                 }
 963         } else if (cxgb3i_get_private_ipv4addr(chba->ndev)) {
 964                 if (chba->vdev)
 965                         cxgb3i_set_private_ipv4addr(chba->vdev, 0);
 966                 cxgb3i_set_private_ipv4addr(chba->ndev, 0);
 967         }
 968 }
 969
 970 static int init_act_open(struct cxgbi_sock *csk)
 971 {
 972         struct dst_entry *dst = csk->dst;
 973         struct cxgbi_device *cdev = csk->cdev;
 974         struct t3cdev *t3dev = (struct t3cdev *)cdev->lldev;
 975         struct net_device *ndev = cdev->ports[csk->port_id];
 976         struct cxgbi_hba *chba = cdev->hbas[csk->port_id];
 977         struct sk_buff *skb = NULL;
 978
 979         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 980                 "csk 0x%p,%u,0x%lx.\n", csk, csk->state, csk->flags);
 981
 982         update_address(chba);
 983         if (chba->ipv4addr)
 984                 csk->saddr.sin_addr.s_addr = chba->ipv4addr;
 985
 986         csk->rss_qid = 0;
 987         csk->l2t = t3_l2t_get(t3dev, dst_get_neighbour(dst), ndev);
 988         if (!csk->l2t) {
 989                 pr_err("NO l2t available.\n");
 990                 return -EINVAL;
 991         }
 992         cxgbi_sock_get(csk);
 993
 994         csk->atid = cxgb3_alloc_atid(t3dev, &t3_client, csk);
 995         if (csk->atid < 0) {
 996                 pr_err("NO atid available.\n");
 997                 goto rel_resource;
 998         }
 999         cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
1000         cxgbi_sock_get(csk);
1001
1002         skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_KERNEL);
1003         if (!skb)
1004                 goto rel_resource;
1005         skb->sk = (struct sock *)csk;
1006         set_arp_failure_handler(skb, act_open_arp_failure);
1007
1008         csk->wr_max_cred = csk->wr_cred = T3C_DATA(t3dev)->max_wrs - 1;
1009         csk->wr_una_cred = 0;
1010         csk->mss_idx = cxgbi_sock_select_mss(csk, dst_mtu(dst));
1011         cxgbi_sock_reset_wr_list(csk);
1012         csk->err = 0;
1013
1014         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1015                 "csk 0x%p,%u,0x%lx, %pI4:%u-%pI4:%u.\n",
1016                 csk, csk->state, csk->flags,
1017                 &csk->saddr.sin_addr.s_addr, ntohs(csk->saddr.sin_port),
1018                 &csk->daddr.sin_addr.s_addr, ntohs(csk->daddr.sin_port));
1019
1020         cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
1021         send_act_open_req(csk, skb, csk->l2t);
1022         return 0;
1023
1024 rel_resource:
1025         if (skb)
1026                 __kfree_skb(skb);
1027         return -EINVAL;
1028 }
1029
1030 cxgb3_cpl_handler_func cxgb3i_cpl_handlers[NUM_CPL_CMDS] = {
1031         [CPL_ACT_ESTABLISH] = do_act_establish,
1032         [CPL_ACT_OPEN_RPL] = do_act_open_rpl,
1033         [CPL_PEER_CLOSE] = do_peer_close,
1034         [CPL_ABORT_REQ_RSS] = do_abort_req,
1035         [CPL_ABORT_RPL_RSS] = do_abort_rpl,
1036         [CPL_CLOSE_CON_RPL] = do_close_con_rpl,
1037         [CPL_TX_DMA_ACK] = do_wr_ack,
1038         [CPL_ISCSI_HDR] = do_iscsi_hdr,
1039 };
1040
1041 /**
1042  * cxgb3i_ofld_init - allocate and initialize resources for each adapter found
1043  * @cdev:       cxgbi adapter
1044  */
1045 int cxgb3i_ofld_init(struct cxgbi_device *cdev)
1046 {
1047         struct t3cdev *t3dev = (struct t3cdev *)cdev->lldev;
1048         struct adap_ports port;
1049         struct ofld_page_info rx_page_info;
1050         unsigned int wr_len;
1051         int rc;
1052
1053         if (t3dev->ctl(t3dev, GET_WR_LEN, &wr_len) < 0 ||
1054             t3dev->ctl(t3dev, GET_PORTS, &port) < 0 ||
1055             t3dev->ctl(t3dev, GET_RX_PAGE_INFO, &rx_page_info) < 0) {
1056                 pr_warn("t3 0x%p, offload up, ioctl failed.\n", t3dev);
1057                 return -EINVAL;
1058         }
1059
1060         if (cxgb3i_max_connect > CXGBI_MAX_CONN)
1061                 cxgb3i_max_connect = CXGBI_MAX_CONN;
1062
1063         rc = cxgbi_device_portmap_create(cdev, cxgb3i_sport_base,
1064                                         cxgb3i_max_connect);
1065         if (rc < 0)
1066                 return rc;
1067
1068         init_wr_tab(wr_len);
1069         cdev->csk_release_offload_resources = release_offload_resources;
1070         cdev->csk_push_tx_frames = push_tx_frames;
1071         cdev->csk_send_abort_req = send_abort_req;
1072         cdev->csk_send_close_req = send_close_req;
1073         cdev->csk_send_rx_credits = send_rx_credits;
1074         cdev->csk_alloc_cpls = alloc_cpls;
1075         cdev->csk_init_act_open = init_act_open;
1076
1077         pr_info("cdev 0x%p, offload up, added.\n", cdev);
1078         return 0;
1079 }
1080
1081 /*
1082  * functions to program the pagepod in h/w
1083  */
1084 static inline void ulp_mem_io_set_hdr(struct sk_buff *skb, unsigned int addr)
1085 {
1086         struct ulp_mem_io *req = (struct ulp_mem_io *)skb->head;
1087
1088         memset(req, 0, sizeof(*req));
1089
1090         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_BYPASS));
1091         req->cmd_lock_addr = htonl(V_ULP_MEMIO_ADDR(addr >> 5) |
1092                                    V_ULPTX_CMD(ULP_MEM_WRITE));
1093         req->len = htonl(V_ULP_MEMIO_DATA_LEN(PPOD_SIZE >> 5) |
1094                          V_ULPTX_NFLITS((PPOD_SIZE >> 3) + 1));
1095 }
1096
1097 static int ddp_set_map(struct cxgbi_sock *csk, struct cxgbi_pagepod_hdr *hdr,
1098                         unsigned int idx, unsigned int npods,
1099                                 struct cxgbi_gather_list *gl)
1100 {
1101         struct cxgbi_device *cdev = csk->cdev;
1102         struct cxgbi_ddp_info *ddp = cdev->ddp;
1103         unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
1104         int i;
1105
1106         log_debug(1 << CXGBI_DBG_DDP,
1107                 "csk 0x%p, idx %u, npods %u, gl 0x%p.\n",
1108                 csk, idx, npods, gl);
1109
1110         for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
1111                 struct sk_buff *skb = alloc_wr(sizeof(struct ulp_mem_io) +
1112                                                 PPOD_SIZE, 0, GFP_ATOMIC);
1113
1114                 if (!skb)
1115                         return -ENOMEM;
1116
1117                 ulp_mem_io_set_hdr(skb, pm_addr);
1118                 cxgbi_ddp_ppod_set((struct cxgbi_pagepod *)(skb->head +
1119                                         sizeof(struct ulp_mem_io)),
1120                                    hdr, gl, i * PPOD_PAGES_MAX);
1121                 skb->priority = CPL_PRIORITY_CONTROL;
1122                 cxgb3_ofld_send(cdev->lldev, skb);
1123         }
1124         return 0;
1125 }
1126
1127 static void ddp_clear_map(struct cxgbi_hba *chba, unsigned int tag,
1128                           unsigned int idx, unsigned int npods)
1129 {
1130         struct cxgbi_device *cdev = chba->cdev;
1131         struct cxgbi_ddp_info *ddp = cdev->ddp;
1132         unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
1133         int i;
1134
1135         log_debug(1 << CXGBI_DBG_DDP,
1136                 "cdev 0x%p, idx %u, npods %u, tag 0x%x.\n",
1137                 cdev, idx, npods, tag);
1138
1139         for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
1140                 struct sk_buff *skb = alloc_wr(sizeof(struct ulp_mem_io) +
1141                                                 PPOD_SIZE, 0, GFP_ATOMIC);
1142
1143                 if (!skb) {
1144                         pr_err("tag 0x%x, 0x%x, %d/%u, skb OOM.\n",
1145                                 tag, idx, i, npods);
1146                         continue;
1147                 }
1148                 ulp_mem_io_set_hdr(skb, pm_addr);
1149                 skb->priority = CPL_PRIORITY_CONTROL;
1150                 cxgb3_ofld_send(cdev->lldev, skb);
1151         }
1152 }
1153
1154 static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk,
1155                                        unsigned int tid, int pg_idx, bool reply)
1156 {
1157         struct sk_buff *skb = alloc_wr(sizeof(struct cpl_set_tcb_field), 0,
1158                                         GFP_KERNEL);
1159         struct cpl_set_tcb_field *req;
1160         u64 val = pg_idx < DDP_PGIDX_MAX ? pg_idx : 0;
1161
1162         log_debug(1 << CXGBI_DBG_DDP,
1163                 "csk 0x%p, tid %u, pg_idx %d.\n", csk, tid, pg_idx);
1164         if (!skb)
1165                 return -ENOMEM;
1166
1167         /* set up ulp submode and page size */
1168         req = (struct cpl_set_tcb_field *)skb->head;
1169         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
1170         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1171         req->reply = V_NO_REPLY(reply ? 0 : 1);
1172         req->cpu_idx = 0;
1173         req->word = htons(31);
1174         req->mask = cpu_to_be64(0xF0000000);
1175         req->val = cpu_to_be64(val << 28);
1176         skb->priority = CPL_PRIORITY_CONTROL;
1177
1178         cxgb3_ofld_send(csk->cdev->lldev, skb);
1179         return 0;
1180 }
1181
1182 /**
1183  * cxgb3i_setup_conn_digest - setup conn. digest setting
1184  * @csk: cxgb tcp socket
1185  * @tid: connection id
1186  * @hcrc: header digest enabled
1187  * @dcrc: data digest enabled
1188  * @reply: request reply from h/w
1189  * set up the iscsi digest settings for a connection identified by tid
1190  */
1191 static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
1192                              int hcrc, int dcrc, int reply)
1193 {
1194         struct sk_buff *skb = alloc_wr(sizeof(struct cpl_set_tcb_field), 0,
1195                                         GFP_KERNEL);
1196         struct cpl_set_tcb_field *req;
1197         u64 val = (hcrc ? 1 : 0) | (dcrc ? 2 : 0);
1198
1199         log_debug(1 << CXGBI_DBG_DDP,
1200                 "csk 0x%p, tid %u, crc %d,%d.\n", csk, tid, hcrc, dcrc);
1201         if (!skb)
1202                 return -ENOMEM;
1203
1204         /* set up ulp submode and page size */
1205         req = (struct cpl_set_tcb_field *)skb->head;
1206         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
1207         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1208         req->reply = V_NO_REPLY(reply ? 0 : 1);
1209         req->cpu_idx = 0;
1210         req->word = htons(31);
1211         req->mask = cpu_to_be64(0x0F000000);
1212         req->val = cpu_to_be64(val << 24);
1213         skb->priority = CPL_PRIORITY_CONTROL;
1214
1215         cxgb3_ofld_send(csk->cdev->lldev, skb);
1216         return 0;
1217 }
1218
1219 /**
1220  * t3_ddp_cleanup - release the cxgb3 adapter's ddp resource
1221  * @cdev: cxgb3i adapter
1222  * release all the resource held by the ddp pagepod manager for a given
1223  * adapter if needed
1224  */
1225
1226 static void t3_ddp_cleanup(struct cxgbi_device *cdev)
1227 {
1228         struct t3cdev *tdev = (struct t3cdev *)cdev->lldev;
1229
1230         if (cxgbi_ddp_cleanup(cdev)) {
1231                 pr_info("t3dev 0x%p, ulp_iscsi no more user.\n", tdev);
1232                 tdev->ulp_iscsi = NULL;
1233         }
1234 }
1235
1236 /**
1237  * ddp_init - initialize the cxgb3 adapter's ddp resource
1238  * @cdev: cxgb3i adapter
1239  * initialize the ddp pagepod manager for a given adapter
1240  */
1241 static int cxgb3i_ddp_init(struct cxgbi_device *cdev)
1242 {
1243         struct t3cdev *tdev = (struct t3cdev *)cdev->lldev;
1244         struct cxgbi_ddp_info *ddp = tdev->ulp_iscsi;
1245         struct ulp_iscsi_info uinfo;
1246         unsigned int pgsz_factor[4];
1247         int i, err;
1248
1249         if (ddp) {
1250                 kref_get(&ddp->refcnt);
1251                 pr_warn("t3dev 0x%p, ddp 0x%p already set up.\n",
1252                         tdev, tdev->ulp_iscsi);
1253                 cdev->ddp = ddp;
1254                 return -EALREADY;
1255         }
1256
1257         err = tdev->ctl(tdev, ULP_ISCSI_GET_PARAMS, &uinfo);
1258         if (err < 0) {
1259                 pr_err("%s, failed to get iscsi param err=%d.\n",
1260                          tdev->name, err);
1261                 return err;
1262         }
1263
1264         err = cxgbi_ddp_init(cdev, uinfo.llimit, uinfo.ulimit,
1265                         uinfo.max_txsz, uinfo.max_rxsz);
1266         if (err < 0)
1267                 return err;
1268
1269         ddp = cdev->ddp;
1270
1271         uinfo.tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
1272         cxgbi_ddp_page_size_factor(pgsz_factor);
1273         for (i = 0; i < 4; i++)
1274                 uinfo.pgsz_factor[i] = pgsz_factor[i];
1275         uinfo.ulimit = uinfo.llimit + (ddp->nppods << PPOD_SIZE_SHIFT);
1276
1277         err = tdev->ctl(tdev, ULP_ISCSI_SET_PARAMS, &uinfo);
1278         if (err < 0) {
1279                 pr_warn("%s unable to set iscsi param err=%d, ddp disabled.\n",
1280                         tdev->name, err);
1281                 cxgbi_ddp_cleanup(cdev);
1282                 return err;
1283         }
1284         tdev->ulp_iscsi = ddp;
1285
1286         cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
1287         cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
1288         cdev->csk_ddp_set = ddp_set_map;
1289         cdev->csk_ddp_clear = ddp_clear_map;
1290
1291         pr_info("tdev 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u, "
1292                 "%u/%u.\n",
1293                 tdev, ddp->nppods, ddp->idx_bits, ddp->idx_mask,
1294                 ddp->rsvd_tag_mask, ddp->max_txsz, uinfo.max_txsz,
1295                 ddp->max_rxsz, uinfo.max_rxsz);
1296         return 0;
1297 }
1298
1299 static void cxgb3i_dev_close(struct t3cdev *t3dev)
1300 {
1301         struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
1302
1303         if (!cdev || cdev->flags & CXGBI_FLAG_ADAPTER_RESET) {
1304                 pr_info("0x%p close, f 0x%x.\n", cdev, cdev ? cdev->flags : 0);
1305                 return;
1306         }
1307
1308         cxgbi_device_unregister(cdev);
1309 }
1310
1311 /**
1312  * cxgb3i_dev_open - init a t3 adapter structure and any h/w settings
1313  * @t3dev: t3cdev adapter
1314  */
1315 static void cxgb3i_dev_open(struct t3cdev *t3dev)
1316 {
1317         struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
1318         struct adapter *adapter = tdev2adap(t3dev);
1319         int i, err;
1320
1321         if (cdev) {
1322                 pr_info("0x%p, updating.\n", cdev);
1323                 return;
1324         }
1325
1326         cdev = cxgbi_device_register(0, adapter->params.nports);
1327         if (!cdev) {
1328                 pr_warn("device 0x%p register failed.\n", t3dev);
1329                 return;
1330         }
1331
1332         cdev->flags = CXGBI_FLAG_DEV_T3 | CXGBI_FLAG_IPV4_SET;
1333         cdev->lldev = t3dev;
1334         cdev->pdev = adapter->pdev;
1335         cdev->ports = adapter->port;
1336         cdev->nports = adapter->params.nports;
1337         cdev->mtus = adapter->params.mtus;
1338         cdev->nmtus = NMTUS;
1339         cdev->snd_win = cxgb3i_snd_win;
1340         cdev->rcv_win = cxgb3i_rcv_win;
1341         cdev->rx_credit_thres = cxgb3i_rx_credit_thres;
1342         cdev->skb_tx_rsvd = CXGB3I_TX_HEADER_LEN;
1343         cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr_norss);
1344         cdev->dev_ddp_cleanup = t3_ddp_cleanup;
1345         cdev->itp = &cxgb3i_iscsi_transport;
1346
1347         err = cxgb3i_ddp_init(cdev);
1348         if (err) {
1349                 pr_info("0x%p ddp init failed\n", cdev);
1350                 goto err_out;
1351         }
1352
1353         err = cxgb3i_ofld_init(cdev);
1354         if (err) {
1355                 pr_info("0x%p offload init failed\n", cdev);
1356                 goto err_out;
1357         }
1358
1359         err = cxgbi_hbas_add(cdev, CXGB3I_MAX_LUN, CXGBI_MAX_CONN,
1360                                 &cxgb3i_host_template, cxgb3i_stt);
1361         if (err)
1362                 goto err_out;
1363
1364         for (i = 0; i < cdev->nports; i++)
1365                 cdev->hbas[i]->ipv4addr =
1366                         cxgb3i_get_private_ipv4addr(cdev->ports[i]);
1367
1368         pr_info("cdev 0x%p, f 0x%x, t3dev 0x%p open, err %d.\n",
1369                 cdev, cdev ? cdev->flags : 0, t3dev, err);
1370         return;
1371
1372 err_out:
1373         cxgbi_device_unregister(cdev);
1374 }
1375
1376 static void cxgb3i_dev_event_handler(struct t3cdev *t3dev, u32 event, u32 port)
1377 {
1378         struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
1379
1380         log_debug(1 << CXGBI_DBG_TOE,
1381                 "0x%p, cdev 0x%p, event 0x%x, port 0x%x.\n",
1382                 t3dev, cdev, event, port);
1383         if (!cdev)
1384                 return;
1385
1386         switch (event) {
1387         case OFFLOAD_STATUS_DOWN:
1388                 cdev->flags |= CXGBI_FLAG_ADAPTER_RESET;
1389                 break;
1390         case OFFLOAD_STATUS_UP:
1391                 cdev->flags &= ~CXGBI_FLAG_ADAPTER_RESET;
1392                 break;
1393         }
1394 }
1395
1396 /**
1397  * cxgb3i_init_module - module init entry point
1398  *
1399  * initialize any driver wide global data structures and register itself
1400  *      with the cxgb3 module
1401  */
1402 static int __init cxgb3i_init_module(void)
1403 {
1404         int rc;
1405
1406         printk(KERN_INFO "%s", version);
1407
1408         rc = cxgbi_iscsi_init(&cxgb3i_iscsi_transport, &cxgb3i_stt);
1409         if (rc < 0)
1410                 return rc;
1411
1412         cxgb3_register_client(&t3_client);
1413         return 0;
1414 }
1415
1416 /**
1417  * cxgb3i_exit_module - module cleanup/exit entry point
1418  *
1419  * go through the driver hba list and for each hba, release any resource held.
1420  *      and unregisters iscsi transport and the cxgb3 module
1421  */
1422 static void __exit cxgb3i_exit_module(void)
1423 {
1424         cxgb3_unregister_client(&t3_client);
1425         cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T3);
1426         cxgbi_iscsi_cleanup(&cxgb3i_iscsi_transport, &cxgb3i_stt);
1427 }
1428
1429 module_init(cxgb3i_init_module);
1430 module_exit(cxgb3i_exit_module);