drivers/scsi/cxgbi/cxgb3i/cxgb3i.c

   1 /*
   2  * cxgb3i_offload.c: Chelsio S3xx iscsi offloaded tcp connection management
   3  *
   4  * Copyright (C) 2003-2015 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      "2.0.1-ko"
  36 #define DRV_MODULE_RELDATE      "Apr. 2015"
  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(cxgb3i_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 = scsi_change_queue_depth,
  90         .sg_tablesize   = SG_ALL,
  91         .max_sectors    = 0xFFFF,
  92         .cmd_per_lun    = ISCSI_DEF_CMD_PER_LUN,
  93         .eh_timed_out   = iscsi_eh_cmd_timed_out,
  94         .eh_abort_handler = iscsi_eh_abort,
  95         .eh_device_reset_handler = iscsi_eh_device_reset,
  96         .eh_target_reset_handler = iscsi_eh_recover_target,
  97         .target_alloc   = iscsi_target_alloc,
  98         .dma_boundary   = PAGE_SIZE - 1,
  99         .this_id        = -1,
 100         .track_queue_depth = 1,
 101 };
 102
 103 static struct iscsi_transport cxgb3i_iscsi_transport = {
 104         .owner          = THIS_MODULE,
 105         .name           = DRV_MODULE_NAME,
 106         /* owner and name should be set already */
 107         .caps           = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
 108                                 | CAP_DATADGST | CAP_DIGEST_OFFLOAD |
 109                                 CAP_PADDING_OFFLOAD | CAP_TEXT_NEGO,
 110         .attr_is_visible        = cxgbi_attr_is_visible,
 111         .get_host_param = cxgbi_get_host_param,
 112         .set_host_param = cxgbi_set_host_param,
 113         /* session management */
 114         .create_session = cxgbi_create_session,
 115         .destroy_session        = cxgbi_destroy_session,
 116         .get_session_param = iscsi_session_get_param,
 117         /* connection management */
 118         .create_conn    = cxgbi_create_conn,
 119         .bind_conn      = cxgbi_bind_conn,
 120         .unbind_conn    = iscsi_conn_unbind,
 121         .destroy_conn   = iscsi_tcp_conn_teardown,
 122         .start_conn     = iscsi_conn_start,
 123         .stop_conn      = iscsi_conn_stop,
 124         .get_conn_param = iscsi_conn_get_param,
 125         .set_param      = cxgbi_set_conn_param,
 126         .get_stats      = cxgbi_get_conn_stats,
 127         /* pdu xmit req from user space */
 128         .send_pdu       = iscsi_conn_send_pdu,
 129         /* task */
 130         .init_task      = iscsi_tcp_task_init,
 131         .xmit_task      = iscsi_tcp_task_xmit,
 132         .cleanup_task   = cxgbi_cleanup_task,
 133         /* pdu */
 134         .alloc_pdu      = cxgbi_conn_alloc_pdu,
 135         .init_pdu       = cxgbi_conn_init_pdu,
 136         .xmit_pdu       = cxgbi_conn_xmit_pdu,
 137         .parse_pdu_itt  = cxgbi_parse_pdu_itt,
 138         /* TCP connect/disconnect */
 139         .get_ep_param   = cxgbi_get_ep_param,
 140         .ep_connect     = cxgbi_ep_connect,
 141         .ep_poll        = cxgbi_ep_poll,
 142         .ep_disconnect  = cxgbi_ep_disconnect,
 143         /* Error recovery timeout call */
 144         .session_recovery_timedout = iscsi_session_recovery_timedout,
 145 };
 146
 147 static struct scsi_transport_template *cxgb3i_stt;
 148
 149 /*
 150  * CPL (Chelsio Protocol Language) defines a message passing interface between
 151  * the host driver and Chelsio asic.
 152  * The section below implments CPLs that related to iscsi tcp connection
 153  * open/close/abort and data send/receive.
 154  */
 155
 156 static int push_tx_frames(struct cxgbi_sock *csk, int req_completion);
 157
 158 static void send_act_open_req(struct cxgbi_sock *csk, struct sk_buff *skb,
 159                               const struct l2t_entry *e)
 160 {
 161         unsigned int wscale = cxgbi_sock_compute_wscale(csk->rcv_win);
 162         struct cpl_act_open_req *req = (struct cpl_act_open_req *)skb->head;
 163
 164         skb->priority = CPL_PRIORITY_SETUP;
 165
 166         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 167         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, csk->atid));
 168         req->local_port = csk->saddr.sin_port;
 169         req->peer_port = csk->daddr.sin_port;
 170         req->local_ip = csk->saddr.sin_addr.s_addr;
 171         req->peer_ip = csk->daddr.sin_addr.s_addr;
 172
 173         req->opt0h = htonl(V_KEEP_ALIVE(1) | F_TCAM_BYPASS |
 174                         V_WND_SCALE(wscale) | V_MSS_IDX(csk->mss_idx) |
 175                         V_L2T_IDX(e->idx) | V_TX_CHANNEL(e->smt_idx));
 176         req->opt0l = htonl(V_ULP_MODE(ULP2_MODE_ISCSI) |
 177                         V_RCV_BUFSIZ(csk->rcv_win >> 10));
 178
 179         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 180                 "csk 0x%p,%u,0x%lx,%u, %pI4:%u-%pI4:%u, %u,%u,%u.\n",
 181                 csk, csk->state, csk->flags, csk->atid,
 182                 &req->local_ip, ntohs(req->local_port),
 183                 &req->peer_ip, ntohs(req->peer_port),
 184                 csk->mss_idx, e->idx, e->smt_idx);
 185
 186         l2t_send(csk->cdev->lldev, skb, csk->l2t);
 187 }
 188
 189 static inline void act_open_arp_failure(struct t3cdev *dev, struct sk_buff *skb)
 190 {
 191         cxgbi_sock_act_open_req_arp_failure(NULL, skb);
 192 }
 193
 194 /*
 195  * CPL connection close request: host ->
 196  *
 197  * Close a connection by sending a CPL_CLOSE_CON_REQ message and queue it to
 198  * the write queue (i.e., after any unsent txt data).
 199  */
 200 static void send_close_req(struct cxgbi_sock *csk)
 201 {
 202         struct sk_buff *skb = csk->cpl_close;
 203         struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
 204         unsigned int tid = csk->tid;
 205
 206         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 207                 "csk 0x%p,%u,0x%lx,%u.\n",
 208                 csk, csk->state, csk->flags, csk->tid);
 209
 210         csk->cpl_close = NULL;
 211         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_CLOSE_CON));
 212         req->wr.wr_lo = htonl(V_WR_TID(tid));
 213         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
 214         req->rsvd = htonl(csk->write_seq);
 215
 216         cxgbi_sock_skb_entail(csk, skb);
 217         if (csk->state >= CTP_ESTABLISHED)
 218                 push_tx_frames(csk, 1);
 219 }
 220
 221 /*
 222  * CPL connection abort request: host ->
 223  *
 224  * Send an ABORT_REQ message. Makes sure we do not send multiple ABORT_REQs
 225  * for the same connection and also that we do not try to send a message
 226  * after the connection has closed.
 227  */
 228 static void abort_arp_failure(struct t3cdev *tdev, struct sk_buff *skb)
 229 {
 230         struct cpl_abort_req *req = cplhdr(skb);
 231
 232         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 233                 "t3dev 0x%p, tid %u, skb 0x%p.\n",
 234                 tdev, GET_TID(req), skb);
 235         req->cmd = CPL_ABORT_NO_RST;
 236         cxgb3_ofld_send(tdev, skb);
 237 }
 238
 239 static void send_abort_req(struct cxgbi_sock *csk)
 240 {
 241         struct sk_buff *skb = csk->cpl_abort_req;
 242         struct cpl_abort_req *req;
 243
 244         if (unlikely(csk->state == CTP_ABORTING || !skb))
 245                 return;
 246         cxgbi_sock_set_state(csk, CTP_ABORTING);
 247         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
 248         /* Purge the send queue so we don't send anything after an abort. */
 249         cxgbi_sock_purge_write_queue(csk);
 250
 251         csk->cpl_abort_req = NULL;
 252         req = (struct cpl_abort_req *)skb->head;
 253         skb->priority = CPL_PRIORITY_DATA;
 254         set_arp_failure_handler(skb, abort_arp_failure);
 255         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_REQ));
 256         req->wr.wr_lo = htonl(V_WR_TID(csk->tid));
 257         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
 258         req->rsvd0 = htonl(csk->snd_nxt);
 259         req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);
 260         req->cmd = CPL_ABORT_SEND_RST;
 261
 262         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 263                 "csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
 264                 csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
 265                 req->rsvd1);
 266
 267         l2t_send(csk->cdev->lldev, skb, csk->l2t);
 268 }
 269
 270 /*
 271  * CPL connection abort reply: host ->
 272  *
 273  * Send an ABORT_RPL message in response of the ABORT_REQ received.
 274  */
 275 static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
 276 {
 277         struct sk_buff *skb = csk->cpl_abort_rpl;
 278         struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
 279
 280         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 281                 "csk 0x%p,%u,0x%lx,%u, status %d.\n",
 282                 csk, csk->state, csk->flags, csk->tid, rst_status);
 283
 284         csk->cpl_abort_rpl = NULL;
 285         skb->priority = CPL_PRIORITY_DATA;
 286         rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
 287         rpl->wr.wr_lo = htonl(V_WR_TID(csk->tid));
 288         OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
 289         rpl->cmd = rst_status;
 290         cxgb3_ofld_send(csk->cdev->lldev, skb);
 291 }
 292
 293 /*
 294  * CPL connection rx data ack: host ->
 295  * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
 296  * credits sent.
 297  */
 298 static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
 299 {
 300         struct sk_buff *skb;
 301         struct cpl_rx_data_ack *req;
 302         u32 dack = F_RX_DACK_CHANGE | V_RX_DACK_MODE(1);
 303
 304         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 305                 "csk 0x%p,%u,0x%lx,%u, credit %u, dack %u.\n",
 306                 csk, csk->state, csk->flags, csk->tid, credits, dack);
 307
 308         skb = alloc_wr(sizeof(*req), 0, GFP_ATOMIC);
 309         if (!skb) {
 310                 pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
 311                 return 0;
 312         }
 313         req = (struct cpl_rx_data_ack *)skb->head;
 314         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 315         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_RX_DATA_ACK, csk->tid));
 316         req->credit_dack = htonl(F_RX_DACK_CHANGE | V_RX_DACK_MODE(1) |
 317                                 V_RX_CREDITS(credits));
 318         skb->priority = CPL_PRIORITY_ACK;
 319         cxgb3_ofld_send(csk->cdev->lldev, skb);
 320         return credits;
 321 }
 322
 323 /*
 324  * CPL connection tx data: host ->
 325  *
 326  * Send iscsi PDU via TX_DATA CPL message. Returns the number of
 327  * credits sent.
 328  * Each TX_DATA consumes work request credit (wrs), so we need to keep track of
 329  * how many we've used so far and how many are pending (i.e., yet ack'ed by T3).
 330  */
 331
 332 static unsigned int wrlen __read_mostly;
 333 static unsigned int skb_wrs[SKB_WR_LIST_SIZE] __read_mostly;
 334
 335 static void init_wr_tab(unsigned int wr_len)
 336 {
 337         int i;
 338
 339         if (skb_wrs[1])         /* already initialized */
 340                 return;
 341         for (i = 1; i < SKB_WR_LIST_SIZE; i++) {
 342                 int sgl_len = (3 * i) / 2 + (i & 1);
 343
 344                 sgl_len += 3;
 345                 skb_wrs[i] = (sgl_len <= wr_len
 346                               ? 1 : 1 + (sgl_len - 2) / (wr_len - 1));
 347         }
 348         wrlen = wr_len * 8;
 349 }
 350
 351 static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
 352                                    int len, int req_completion)
 353 {
 354         struct tx_data_wr *req;
 355         struct l2t_entry *l2t = csk->l2t;
 356
 357         skb_reset_transport_header(skb);
 358         req = __skb_push(skb, sizeof(*req));
 359         req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA) |
 360                         (req_completion ? F_WR_COMPL : 0));
 361         req->wr_lo = htonl(V_WR_TID(csk->tid));
 362         /* len includes the length of any HW ULP additions */
 363         req->len = htonl(len);
 364         /* V_TX_ULP_SUBMODE sets both the mode and submode */
 365         req->flags = htonl(V_TX_ULP_SUBMODE(cxgbi_skcb_tx_ulp_mode(skb)) |
 366                            V_TX_SHOVE((skb_peek(&csk->write_queue) ? 0 : 1)));
 367         req->sndseq = htonl(csk->snd_nxt);
 368         req->param = htonl(V_TX_PORT(l2t->smt_idx));
 369
 370         if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
 371                 req->flags |= htonl(V_TX_ACK_PAGES(2) | F_TX_INIT |
 372                                     V_TX_CPU_IDX(csk->rss_qid));
 373                 /* sendbuffer is in units of 32KB. */
 374                 req->param |= htonl(V_TX_SNDBUF(csk->snd_win >> 15));
 375                 cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
 376         }
 377 }
 378
 379 /*
 380  * push_tx_frames -- start transmit
 381  *
 382  * Prepends TX_DATA_WR or CPL_CLOSE_CON_REQ headers to buffers waiting in a
 383  * connection's send queue and sends them on to T3.  Must be called with the
 384  * connection's lock held.  Returns the amount of send buffer space that was
 385  * freed as a result of sending queued data to T3.
 386  */
 387
 388 static void arp_failure_skb_discard(struct t3cdev *dev, struct sk_buff *skb)
 389 {
 390         kfree_skb(skb);
 391 }
 392
 393 static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
 394 {
 395         int total_size = 0;
 396         struct sk_buff *skb;
 397
 398         if (unlikely(csk->state < CTP_ESTABLISHED ||
 399                 csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
 400                         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
 401                                 "csk 0x%p,%u,0x%lx,%u, in closing state.\n",
 402                                 csk, csk->state, csk->flags, csk->tid);
 403                 return 0;
 404         }
 405
 406         while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
 407                 int len = skb->len;     /* length before skb_push */
 408                 int frags = skb_shinfo(skb)->nr_frags + (len != skb->data_len);
 409                 int wrs_needed = skb_wrs[frags];
 410
 411                 if (wrs_needed > 1 && len + sizeof(struct tx_data_wr) <= wrlen)
 412                         wrs_needed = 1;
 413
 414                 WARN_ON(frags >= SKB_WR_LIST_SIZE || wrs_needed < 1);
 415
 416                 if (csk->wr_cred < wrs_needed) {
 417                         log_debug(1 << CXGBI_DBG_PDU_TX,
 418                                 "csk 0x%p, skb len %u/%u, frag %u, wr %d<%u.\n",
 419                                 csk, skb->len, skb->data_len, frags,
 420                                 wrs_needed, csk->wr_cred);
 421                         break;
 422                 }
 423
 424                 __skb_unlink(skb, &csk->write_queue);
 425                 skb->priority = CPL_PRIORITY_DATA;
 426                 skb->csum = wrs_needed; /* remember this until the WR_ACK */
 427                 csk->wr_cred -= wrs_needed;
 428                 csk->wr_una_cred += wrs_needed;
 429                 cxgbi_sock_enqueue_wr(csk, skb);
 430
 431                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
 432                         "csk 0x%p, enqueue, skb len %u/%u, frag %u, wr %d, "
 433                         "left %u, unack %u.\n",
 434                         csk, skb->len, skb->data_len, frags, skb->csum,
 435                         csk->wr_cred, csk->wr_una_cred);
 436
 437                 if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
 438                         if ((req_completion &&
 439                                 csk->wr_una_cred == wrs_needed) ||
 440                              csk->wr_una_cred >= csk->wr_max_cred / 2) {
 441                                 req_completion = 1;
 442                                 csk->wr_una_cred = 0;
 443                         }
 444                         len += cxgbi_ulp_extra_len(cxgbi_skcb_tx_ulp_mode(skb));
 445                         make_tx_data_wr(csk, skb, len, req_completion);
 446                         csk->snd_nxt += len;
 447                         cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
 448                 }
 449                 total_size += skb->truesize;
 450                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
 451                         "csk 0x%p, tid 0x%x, send skb 0x%p.\n",
 452                         csk, csk->tid, skb);
 453                 set_arp_failure_handler(skb, arp_failure_skb_discard);
 454                 l2t_send(csk->cdev->lldev, skb, csk->l2t);
 455         }
 456         return total_size;
 457 }
 458
 459 /*
 460  * Process a CPL_ACT_ESTABLISH message: -> host
 461  * Updates connection state from an active establish CPL message.  Runs with
 462  * the connection lock held.
 463  */
 464
 465 static inline void free_atid(struct cxgbi_sock *csk)
 466 {
 467         if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
 468                 cxgb3_free_atid(csk->cdev->lldev, csk->atid);
 469                 cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
 470                 cxgbi_sock_put(csk);
 471         }
 472 }
 473
 474 static int do_act_establish(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
 475 {
 476         struct cxgbi_sock *csk = ctx;
 477         struct cpl_act_establish *req = cplhdr(skb);
 478         unsigned int tid = GET_TID(req);
 479         unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
 480         u32 rcv_isn = ntohl(req->rcv_isn);      /* real RCV_ISN + 1 */
 481
 482         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 483                 "atid 0x%x,tid 0x%x, csk 0x%p,%u,0x%lx, isn %u.\n",
 484                 atid, atid, csk, csk->state, csk->flags, rcv_isn);
 485
 486         cxgbi_sock_get(csk);
 487         cxgbi_sock_set_flag(csk, CTPF_HAS_TID);
 488         csk->tid = tid;
 489         cxgb3_insert_tid(csk->cdev->lldev, &t3_client, csk, tid);
 490
 491         free_atid(csk);
 492
 493         csk->rss_qid = G_QNUM(ntohs(skb->csum));
 494
 495         spin_lock_bh(&csk->lock);
 496         if (csk->retry_timer.function) {
 497                 del_timer(&csk->retry_timer);
 498                 csk->retry_timer.function = NULL;
 499         }
 500
 501         if (unlikely(csk->state != CTP_ACTIVE_OPEN))
 502                 pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
 503                         csk, csk->state, csk->flags, csk->tid);
 504
 505         csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
 506         if (csk->rcv_win > (M_RCV_BUFSIZ << 10))
 507                 csk->rcv_wup -= csk->rcv_win - (M_RCV_BUFSIZ << 10);
 508
 509         cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));
 510
 511         if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
 512                 /* upper layer has requested closing */
 513                 send_abort_req(csk);
 514         else {
 515                 if (skb_queue_len(&csk->write_queue))
 516                         push_tx_frames(csk, 1);
 517                 cxgbi_conn_tx_open(csk);
 518         }
 519
 520         spin_unlock_bh(&csk->lock);
 521         __kfree_skb(skb);
 522         return 0;
 523 }
 524
 525 /*
 526  * Process a CPL_ACT_OPEN_RPL message: -> host
 527  * Handle active open failures.
 528  */
 529 static int act_open_rpl_status_to_errno(int status)
 530 {
 531         switch (status) {
 532         case CPL_ERR_CONN_RESET:
 533                 return -ECONNREFUSED;
 534         case CPL_ERR_ARP_MISS:
 535                 return -EHOSTUNREACH;
 536         case CPL_ERR_CONN_TIMEDOUT:
 537                 return -ETIMEDOUT;
 538         case CPL_ERR_TCAM_FULL:
 539                 return -ENOMEM;
 540         case CPL_ERR_CONN_EXIST:
 541                 return -EADDRINUSE;
 542         default:
 543                 return -EIO;
 544         }
 545 }
 546
 547 static void act_open_retry_timer(struct timer_list *t)
 548 {
 549         struct cxgbi_sock *csk = from_timer(csk, t, retry_timer);
 550         struct sk_buff *skb;
 551
 552         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 553                 "csk 0x%p,%u,0x%lx,%u.\n",
 554                 csk, csk->state, csk->flags, csk->tid);
 555
 556         cxgbi_sock_get(csk);
 557         spin_lock_bh(&csk->lock);
 558         skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_ATOMIC);
 559         if (!skb)
 560                 cxgbi_sock_fail_act_open(csk, -ENOMEM);
 561         else {
 562                 skb->sk = (struct sock *)csk;
 563                 set_arp_failure_handler(skb, act_open_arp_failure);
 564                 send_act_open_req(csk, skb, csk->l2t);
 565         }
 566         spin_unlock_bh(&csk->lock);
 567         cxgbi_sock_put(csk);
 568 }
 569
 570 static int do_act_open_rpl(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
 571 {
 572         struct cxgbi_sock *csk = ctx;
 573         struct cpl_act_open_rpl *rpl = cplhdr(skb);
 574
 575         pr_info("csk 0x%p,%u,0x%lx,%u, status %u, %pI4:%u-%pI4:%u.\n",
 576                 csk, csk->state, csk->flags, csk->atid, rpl->status,
 577                 &csk->saddr.sin_addr.s_addr, ntohs(csk->saddr.sin_port),
 578                 &csk->daddr.sin_addr.s_addr, ntohs(csk->daddr.sin_port));
 579
 580         if (rpl->status != CPL_ERR_TCAM_FULL &&
 581             rpl->status != CPL_ERR_CONN_EXIST &&
 582             rpl->status != CPL_ERR_ARP_MISS)
 583                 cxgb3_queue_tid_release(tdev, GET_TID(rpl));
 584
 585         cxgbi_sock_get(csk);
 586         spin_lock_bh(&csk->lock);
 587         if (rpl->status == CPL_ERR_CONN_EXIST &&
 588             csk->retry_timer.function != act_open_retry_timer) {
 589                 csk->retry_timer.function = act_open_retry_timer;
 590                 mod_timer(&csk->retry_timer, jiffies + HZ / 2);
 591         } else
 592                 cxgbi_sock_fail_act_open(csk,
 593                                 act_open_rpl_status_to_errno(rpl->status));
 594
 595         spin_unlock_bh(&csk->lock);
 596         cxgbi_sock_put(csk);
 597         __kfree_skb(skb);
 598         return 0;
 599 }
 600
 601 /*
 602  * Process PEER_CLOSE CPL messages: -> host
 603  * Handle peer FIN.
 604  */
 605 static int do_peer_close(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
 606 {
 607         struct cxgbi_sock *csk = ctx;
 608
 609         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 610                 "csk 0x%p,%u,0x%lx,%u.\n",
 611                 csk, csk->state, csk->flags, csk->tid);
 612
 613         cxgbi_sock_rcv_peer_close(csk);
 614         __kfree_skb(skb);
 615         return 0;
 616 }
 617
 618 /*
 619  * Process CLOSE_CONN_RPL CPL message: -> host
 620  * Process a peer ACK to our FIN.
 621  */
 622 static int do_close_con_rpl(struct t3cdev *cdev, struct sk_buff *skb,
 623                             void *ctx)
 624 {
 625         struct cxgbi_sock *csk = ctx;
 626         struct cpl_close_con_rpl *rpl = cplhdr(skb);
 627
 628         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 629                 "csk 0x%p,%u,0x%lx,%u, snxt %u.\n",
 630                 csk, csk->state, csk->flags, csk->tid, ntohl(rpl->snd_nxt));
 631
 632         cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
 633         __kfree_skb(skb);
 634         return 0;
 635 }
 636
 637 /*
 638  * Process ABORT_REQ_RSS CPL message: -> host
 639  * Process abort requests.  If we are waiting for an ABORT_RPL we ignore this
 640  * request except that we need to reply to it.
 641  */
 642
 643 static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
 644                                  int *need_rst)
 645 {
 646         switch (abort_reason) {
 647         case CPL_ERR_BAD_SYN:
 648         case CPL_ERR_CONN_RESET:
 649                 return csk->state > CTP_ESTABLISHED ? -EPIPE : -ECONNRESET;
 650         case CPL_ERR_XMIT_TIMEDOUT:
 651         case CPL_ERR_PERSIST_TIMEDOUT:
 652         case CPL_ERR_FINWAIT2_TIMEDOUT:
 653         case CPL_ERR_KEEPALIVE_TIMEDOUT:
 654                 return -ETIMEDOUT;
 655         default:
 656                 return -EIO;
 657         }
 658 }
 659
 660 static int do_abort_req(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
 661 {
 662         const struct cpl_abort_req_rss *req = cplhdr(skb);
 663         struct cxgbi_sock *csk = ctx;
 664         int rst_status = CPL_ABORT_NO_RST;
 665
 666         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 667                 "csk 0x%p,%u,0x%lx,%u.\n",
 668                 csk, csk->state, csk->flags, csk->tid);
 669
 670         if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
 671             req->status == CPL_ERR_PERSIST_NEG_ADVICE) {
 672                 goto done;
 673         }
 674
 675         cxgbi_sock_get(csk);
 676         spin_lock_bh(&csk->lock);
 677
 678         if (!cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) {
 679                 cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
 680                 cxgbi_sock_set_state(csk, CTP_ABORTING);
 681                 goto out;
 682         }
 683
 684         cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
 685         send_abort_rpl(csk, rst_status);
 686
 687         if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 688                 csk->err = abort_status_to_errno(csk, req->status, &rst_status);
 689                 cxgbi_sock_closed(csk);
 690         }
 691
 692 out:
 693         spin_unlock_bh(&csk->lock);
 694         cxgbi_sock_put(csk);
 695 done:
 696         __kfree_skb(skb);
 697         return 0;
 698 }
 699
 700 /*
 701  * Process ABORT_RPL_RSS CPL message: -> host
 702  * Process abort replies.  We only process these messages if we anticipate
 703  * them as the coordination between SW and HW in this area is somewhat lacking
 704  * and sometimes we get ABORT_RPLs after we are done with the connection that
 705  * originated the ABORT_REQ.
 706  */
 707 static int do_abort_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
 708 {
 709         struct cpl_abort_rpl_rss *rpl = cplhdr(skb);
 710         struct cxgbi_sock *csk = ctx;
 711
 712         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 713                 "status 0x%x, csk 0x%p, s %u, 0x%lx.\n",
 714                 rpl->status, csk, csk ? csk->state : 0,
 715                 csk ? csk->flags : 0UL);
 716         /*
 717          * Ignore replies to post-close aborts indicating that the abort was
 718          * requested too late.  These connections are terminated when we get
 719          * PEER_CLOSE or CLOSE_CON_RPL and by the time the abort_rpl_rss
 720          * arrives the TID is either no longer used or it has been recycled.
 721          */
 722         if (rpl->status == CPL_ERR_ABORT_FAILED)
 723                 goto rel_skb;
 724         /*
 725          * Sometimes we've already closed the connection, e.g., a post-close
 726          * abort races with ABORT_REQ_RSS, the latter frees the connection
 727          * expecting the ABORT_REQ will fail with CPL_ERR_ABORT_FAILED,
 728          * but FW turns the ABORT_REQ into a regular one and so we get
 729          * ABORT_RPL_RSS with status 0 and no connection.
 730          */
 731         if (csk)
 732                 cxgbi_sock_rcv_abort_rpl(csk);
 733 rel_skb:
 734         __kfree_skb(skb);
 735         return 0;
 736 }
 737
 738 /*
 739  * Process RX_ISCSI_HDR CPL message: -> host
 740  * Handle received PDUs, the payload could be DDP'ed. If not, the payload
 741  * follow after the bhs.
 742  */
 743 static int do_iscsi_hdr(struct t3cdev *t3dev, struct sk_buff *skb, void *ctx)
 744 {
 745         struct cxgbi_sock *csk = ctx;
 746         struct cpl_iscsi_hdr *hdr_cpl = cplhdr(skb);
 747         struct cpl_iscsi_hdr_norss data_cpl;
 748         struct cpl_rx_data_ddp_norss ddp_cpl;
 749         unsigned int hdr_len, data_len, status;
 750         unsigned int len;
 751         int err;
 752
 753         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 754                 "csk 0x%p,%u,0x%lx,%u, skb 0x%p,%u.\n",
 755                 csk, csk->state, csk->flags, csk->tid, skb, skb->len);
 756
 757         spin_lock_bh(&csk->lock);
 758
 759         if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
 760                 log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 761                         "csk 0x%p,%u,0x%lx,%u, bad state.\n",
 762                         csk, csk->state, csk->flags, csk->tid);
 763                 if (csk->state != CTP_ABORTING)
 764                         goto abort_conn;
 765                 else
 766                         goto discard;
 767         }
 768
 769         cxgbi_skcb_tcp_seq(skb) = ntohl(hdr_cpl->seq);
 770         cxgbi_skcb_flags(skb) = 0;
 771
 772         skb_reset_transport_header(skb);
 773         __skb_pull(skb, sizeof(struct cpl_iscsi_hdr));
 774
 775         len = hdr_len = ntohs(hdr_cpl->len);
 776         /* msg coalesce is off or not enough data received */
 777         if (skb->len <= hdr_len) {
 778                 pr_err("%s: tid %u, CPL_ISCSI_HDR, skb len %u < %u.\n",
 779                         csk->cdev->ports[csk->port_id]->name, csk->tid,
 780                         skb->len, hdr_len);
 781                 goto abort_conn;
 782         }
 783         cxgbi_skcb_set_flag(skb, SKCBF_RX_COALESCED);
 784
 785         err = skb_copy_bits(skb, skb->len - sizeof(ddp_cpl), &ddp_cpl,
 786                             sizeof(ddp_cpl));
 787         if (err < 0) {
 788                 pr_err("%s: tid %u, copy cpl_ddp %u-%zu failed %d.\n",
 789                         csk->cdev->ports[csk->port_id]->name, csk->tid,
 790                         skb->len, sizeof(ddp_cpl), err);
 791                 goto abort_conn;
 792         }
 793
 794         cxgbi_skcb_set_flag(skb, SKCBF_RX_STATUS);
 795         cxgbi_skcb_rx_pdulen(skb) = ntohs(ddp_cpl.len);
 796         cxgbi_skcb_rx_ddigest(skb) = ntohl(ddp_cpl.ulp_crc);
 797         status = ntohl(ddp_cpl.ddp_status);
 798
 799         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 800                 "csk 0x%p, skb 0x%p,%u, pdulen %u, status 0x%x.\n",
 801                 csk, skb, skb->len, cxgbi_skcb_rx_pdulen(skb), status);
 802
 803         if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT))
 804                 cxgbi_skcb_set_flag(skb, SKCBF_RX_HCRC_ERR);
 805         if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT))
 806                 cxgbi_skcb_set_flag(skb, SKCBF_RX_DCRC_ERR);
 807         if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT))
 808                 cxgbi_skcb_set_flag(skb, SKCBF_RX_PAD_ERR);
 809
 810         if (skb->len > (hdr_len + sizeof(ddp_cpl))) {
 811                 err = skb_copy_bits(skb, hdr_len, &data_cpl, sizeof(data_cpl));
 812                 if (err < 0) {
 813                         pr_err("%s: tid %u, cp %zu/%u failed %d.\n",
 814                                 csk->cdev->ports[csk->port_id]->name,
 815                                 csk->tid, sizeof(data_cpl), skb->len, err);
 816                         goto abort_conn;
 817                 }
 818                 data_len = ntohs(data_cpl.len);
 819                 log_debug(1 << CXGBI_DBG_DDP | 1 << CXGBI_DBG_PDU_RX,
 820                         "skb 0x%p, pdu not ddp'ed %u/%u, status 0x%x.\n",
 821                         skb, data_len, cxgbi_skcb_rx_pdulen(skb), status);
 822                 len += sizeof(data_cpl) + data_len;
 823         } else if (status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT))
 824                 cxgbi_skcb_set_flag(skb, SKCBF_RX_DATA_DDPD);
 825
 826         csk->rcv_nxt = ntohl(ddp_cpl.seq) + cxgbi_skcb_rx_pdulen(skb);
 827         __pskb_trim(skb, len);
 828         __skb_queue_tail(&csk->receive_queue, skb);
 829         cxgbi_conn_pdu_ready(csk);
 830
 831         spin_unlock_bh(&csk->lock);
 832         return 0;
 833
 834 abort_conn:
 835         send_abort_req(csk);
 836 discard:
 837         spin_unlock_bh(&csk->lock);
 838         __kfree_skb(skb);
 839         return 0;
 840 }
 841
 842 /*
 843  * Process TX_DATA_ACK CPL messages: -> host
 844  * Process an acknowledgment of WR completion.  Advance snd_una and send the
 845  * next batch of work requests from the write queue.
 846  */
 847 static int do_wr_ack(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
 848 {
 849         struct cxgbi_sock *csk = ctx;
 850         struct cpl_wr_ack *hdr = cplhdr(skb);
 851
 852         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
 853                 "csk 0x%p,%u,0x%lx,%u, cr %u.\n",
 854                 csk, csk->state, csk->flags, csk->tid, ntohs(hdr->credits));
 855
 856         cxgbi_sock_rcv_wr_ack(csk, ntohs(hdr->credits), ntohl(hdr->snd_una), 1);
 857         __kfree_skb(skb);
 858         return 0;
 859 }
 860
 861 /*
 862  * for each connection, pre-allocate skbs needed for close/abort requests. So
 863  * that we can service the request right away.
 864  */
 865 static int alloc_cpls(struct cxgbi_sock *csk)
 866 {
 867         csk->cpl_close = alloc_wr(sizeof(struct cpl_close_con_req), 0,
 868                                         GFP_KERNEL);
 869         if (!csk->cpl_close)
 870                 return -ENOMEM;
 871         csk->cpl_abort_req = alloc_wr(sizeof(struct cpl_abort_req), 0,
 872                                         GFP_KERNEL);
 873         if (!csk->cpl_abort_req)
 874                 goto free_cpl_skbs;
 875
 876         csk->cpl_abort_rpl = alloc_wr(sizeof(struct cpl_abort_rpl), 0,
 877                                         GFP_KERNEL);
 878         if (!csk->cpl_abort_rpl)
 879                 goto free_cpl_skbs;
 880
 881         return 0;
 882
 883 free_cpl_skbs:
 884         cxgbi_sock_free_cpl_skbs(csk);
 885         return -ENOMEM;
 886 }
 887
 888 static void l2t_put(struct cxgbi_sock *csk)
 889 {
 890         struct t3cdev *t3dev = (struct t3cdev *)csk->cdev->lldev;
 891
 892         if (csk->l2t) {
 893                 l2t_release(t3dev, csk->l2t);
 894                 csk->l2t = NULL;
 895                 cxgbi_sock_put(csk);
 896         }
 897 }
 898
 899 /*
 900  * release_offload_resources - release offload resource
 901  * Release resources held by an offload connection (TID, L2T entry, etc.)
 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         int ret;
 961
 962         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 963                 "csk 0x%p,%u,0x%lx.\n", csk, csk->state, csk->flags);
 964
 965         update_address(chba);
 966         if (chba->ipv4addr)
 967                 csk->saddr.sin_addr.s_addr = chba->ipv4addr;
 968
 969         csk->rss_qid = 0;
 970         csk->l2t = t3_l2t_get(t3dev, dst, ndev,
 971                               &csk->daddr.sin_addr.s_addr);
 972         if (!csk->l2t) {
 973                 pr_err("NO l2t available.\n");
 974                 return -EINVAL;
 975         }
 976         cxgbi_sock_get(csk);
 977
 978         csk->atid = cxgb3_alloc_atid(t3dev, &t3_client, csk);
 979         if (csk->atid < 0) {
 980                 pr_err("NO atid available.\n");
 981                 ret = -EINVAL;
 982                 goto put_sock;
 983         }
 984         cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
 985         cxgbi_sock_get(csk);
 986
 987         skb = alloc_wr(sizeof(struct cpl_act_open_req), 0, GFP_KERNEL);
 988         if (!skb) {
 989                 ret = -ENOMEM;
 990                 goto free_atid;
 991         }
 992         skb->sk = (struct sock *)csk;
 993         set_arp_failure_handler(skb, act_open_arp_failure);
 994         csk->snd_win = cxgb3i_snd_win;
 995         csk->rcv_win = cxgb3i_rcv_win;
 996
 997         csk->wr_max_cred = csk->wr_cred = T3C_DATA(t3dev)->max_wrs - 1;
 998         csk->wr_una_cred = 0;
 999         csk->mss_idx = cxgbi_sock_select_mss(csk, dst_mtu(dst));
1000         cxgbi_sock_reset_wr_list(csk);
1001         csk->err = 0;
1002
1003         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1004                 "csk 0x%p,%u,0x%lx, %pI4:%u-%pI4:%u.\n",
1005                 csk, csk->state, csk->flags,
1006                 &csk->saddr.sin_addr.s_addr, ntohs(csk->saddr.sin_port),
1007                 &csk->daddr.sin_addr.s_addr, ntohs(csk->daddr.sin_port));
1008
1009         cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
1010         send_act_open_req(csk, skb, csk->l2t);
1011         return 0;
1012
1013 free_atid:
1014         cxgb3_free_atid(t3dev, csk->atid);
1015 put_sock:
1016         cxgbi_sock_put(csk);
1017         l2t_release(t3dev, csk->l2t);
1018         csk->l2t = NULL;
1019
1020         return ret;
1021 }
1022
1023 cxgb3_cpl_handler_func cxgb3i_cpl_handlers[NUM_CPL_CMDS] = {
1024         [CPL_ACT_ESTABLISH] = do_act_establish,
1025         [CPL_ACT_OPEN_RPL] = do_act_open_rpl,
1026         [CPL_PEER_CLOSE] = do_peer_close,
1027         [CPL_ABORT_REQ_RSS] = do_abort_req,
1028         [CPL_ABORT_RPL_RSS] = do_abort_rpl,
1029         [CPL_CLOSE_CON_RPL] = do_close_con_rpl,
1030         [CPL_TX_DMA_ACK] = do_wr_ack,
1031         [CPL_ISCSI_HDR] = do_iscsi_hdr,
1032 };
1033
1034 /**
1035  * cxgb3i_ofld_init - allocate and initialize resources for each adapter found
1036  * @cdev:       cxgbi adapter
1037  */
1038 static int cxgb3i_ofld_init(struct cxgbi_device *cdev)
1039 {
1040         struct t3cdev *t3dev = (struct t3cdev *)cdev->lldev;
1041         struct adap_ports port;
1042         struct ofld_page_info rx_page_info;
1043         unsigned int wr_len;
1044         int rc;
1045
1046         if (t3dev->ctl(t3dev, GET_WR_LEN, &wr_len) < 0 ||
1047             t3dev->ctl(t3dev, GET_PORTS, &port) < 0 ||
1048             t3dev->ctl(t3dev, GET_RX_PAGE_INFO, &rx_page_info) < 0) {
1049                 pr_warn("t3 0x%p, offload up, ioctl failed.\n", t3dev);
1050                 return -EINVAL;
1051         }
1052
1053         if (cxgb3i_max_connect > CXGBI_MAX_CONN)
1054                 cxgb3i_max_connect = CXGBI_MAX_CONN;
1055
1056         rc = cxgbi_device_portmap_create(cdev, cxgb3i_sport_base,
1057                                         cxgb3i_max_connect);
1058         if (rc < 0)
1059                 return rc;
1060
1061         init_wr_tab(wr_len);
1062         cdev->csk_release_offload_resources = release_offload_resources;
1063         cdev->csk_push_tx_frames = push_tx_frames;
1064         cdev->csk_send_abort_req = send_abort_req;
1065         cdev->csk_send_close_req = send_close_req;
1066         cdev->csk_send_rx_credits = send_rx_credits;
1067         cdev->csk_alloc_cpls = alloc_cpls;
1068         cdev->csk_init_act_open = init_act_open;
1069
1070         pr_info("cdev 0x%p, offload up, added.\n", cdev);
1071         return 0;
1072 }
1073
1074 /*
1075  * functions to program the pagepod in h/w
1076  */
1077 static inline void ulp_mem_io_set_hdr(struct sk_buff *skb, unsigned int addr)
1078 {
1079         struct ulp_mem_io *req = (struct ulp_mem_io *)skb->head;
1080
1081         memset(req, 0, sizeof(*req));
1082
1083         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_BYPASS));
1084         req->cmd_lock_addr = htonl(V_ULP_MEMIO_ADDR(addr >> 5) |
1085                                    V_ULPTX_CMD(ULP_MEM_WRITE));
1086         req->len = htonl(V_ULP_MEMIO_DATA_LEN(IPPOD_SIZE >> 5) |
1087                          V_ULPTX_NFLITS((IPPOD_SIZE >> 3) + 1));
1088 }
1089
1090 static struct cxgbi_ppm *cdev2ppm(struct cxgbi_device *cdev)
1091 {
1092         return ((struct t3cdev *)cdev->lldev)->ulp_iscsi;
1093 }
1094
1095 static int ddp_set_map(struct cxgbi_ppm *ppm, struct cxgbi_sock *csk,
1096                        struct cxgbi_task_tag_info *ttinfo)
1097 {
1098         unsigned int idx = ttinfo->idx;
1099         unsigned int npods = ttinfo->npods;
1100         struct scatterlist *sg = ttinfo->sgl;
1101         struct cxgbi_pagepod *ppod;
1102         struct ulp_mem_io *req;
1103         unsigned int sg_off;
1104         unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ppm->llimit;
1105         int i;
1106
1107         for (i = 0; i < npods; i++, idx++, pm_addr += IPPOD_SIZE) {
1108                 struct sk_buff *skb = alloc_wr(sizeof(struct ulp_mem_io) +
1109                                                IPPOD_SIZE, 0, GFP_ATOMIC);
1110
1111                 if (!skb)
1112                         return -ENOMEM;
1113                 ulp_mem_io_set_hdr(skb, pm_addr);
1114                 req = (struct ulp_mem_io *)skb->head;
1115                 ppod = (struct cxgbi_pagepod *)(req + 1);
1116                 sg_off = i * PPOD_PAGES_MAX;
1117                 cxgbi_ddp_set_one_ppod(ppod, ttinfo, &sg,
1118                                        &sg_off);
1119                 skb->priority = CPL_PRIORITY_CONTROL;
1120                 cxgb3_ofld_send(ppm->lldev, skb);
1121         }
1122         return 0;
1123 }
1124
1125 static void ddp_clear_map(struct cxgbi_device *cdev, struct cxgbi_ppm *ppm,
1126                           struct cxgbi_task_tag_info *ttinfo)
1127 {
1128         unsigned int idx = ttinfo->idx;
1129         unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ppm->llimit;
1130         unsigned int npods = ttinfo->npods;
1131         int i;
1132
1133         log_debug(1 << CXGBI_DBG_DDP,
1134                   "cdev 0x%p, clear idx %u, npods %u.\n",
1135                   cdev, idx, npods);
1136
1137         for (i = 0; i < npods; i++, idx++, pm_addr += IPPOD_SIZE) {
1138                 struct sk_buff *skb = alloc_wr(sizeof(struct ulp_mem_io) +
1139                                                IPPOD_SIZE, 0, GFP_ATOMIC);
1140
1141                 if (!skb) {
1142                         pr_err("cdev 0x%p, clear ddp, %u,%d/%u, skb OOM.\n",
1143                                cdev, idx, i, npods);
1144                         continue;
1145                 }
1146                 ulp_mem_io_set_hdr(skb, pm_addr);
1147                 skb->priority = CPL_PRIORITY_CONTROL;
1148                 cxgb3_ofld_send(ppm->lldev, skb);
1149         }
1150 }
1151
1152 static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk,
1153                                 unsigned int tid, int pg_idx)
1154 {
1155         struct sk_buff *skb = alloc_wr(sizeof(struct cpl_set_tcb_field), 0,
1156                                         GFP_KERNEL);
1157         struct cpl_set_tcb_field *req;
1158         u64 val = pg_idx < DDP_PGIDX_MAX ? pg_idx : 0;
1159
1160         log_debug(1 << CXGBI_DBG_DDP,
1161                 "csk 0x%p, tid %u, pg_idx %d.\n", csk, tid, pg_idx);
1162         if (!skb)
1163                 return -ENOMEM;
1164
1165         /* set up ulp submode and page size */
1166         req = (struct cpl_set_tcb_field *)skb->head;
1167         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
1168         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1169         req->reply = V_NO_REPLY(1);
1170         req->cpu_idx = 0;
1171         req->word = htons(31);
1172         req->mask = cpu_to_be64(0xF0000000);
1173         req->val = cpu_to_be64(val << 28);
1174         skb->priority = CPL_PRIORITY_CONTROL;
1175
1176         cxgb3_ofld_send(csk->cdev->lldev, skb);
1177         return 0;
1178 }
1179
1180 /**
1181  * cxgb3i_setup_conn_digest - setup conn. digest setting
1182  * @csk: cxgb tcp socket
1183  * @tid: connection id
1184  * @hcrc: header digest enabled
1185  * @dcrc: data digest enabled
1186  * set up the iscsi digest settings for a connection identified by tid
1187  */
1188 static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
1189                                  int hcrc, int dcrc)
1190 {
1191         struct sk_buff *skb = alloc_wr(sizeof(struct cpl_set_tcb_field), 0,
1192                                         GFP_KERNEL);
1193         struct cpl_set_tcb_field *req;
1194         u64 val = (hcrc ? 1 : 0) | (dcrc ? 2 : 0);
1195
1196         log_debug(1 << CXGBI_DBG_DDP,
1197                 "csk 0x%p, tid %u, crc %d,%d.\n", csk, tid, hcrc, dcrc);
1198         if (!skb)
1199                 return -ENOMEM;
1200
1201         /* set up ulp submode and page size */
1202         req = (struct cpl_set_tcb_field *)skb->head;
1203         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
1204         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1205         req->reply = V_NO_REPLY(1);
1206         req->cpu_idx = 0;
1207         req->word = htons(31);
1208         req->mask = cpu_to_be64(0x0F000000);
1209         req->val = cpu_to_be64(val << 24);
1210         skb->priority = CPL_PRIORITY_CONTROL;
1211
1212         cxgb3_ofld_send(csk->cdev->lldev, skb);
1213         return 0;
1214 }
1215
1216 /**
1217  * cxgb3i_ddp_init - initialize the cxgb3 adapter's ddp resource
1218  * @cdev: cxgb3i adapter
1219  * initialize the ddp pagepod manager for a given adapter
1220  */
1221 static int cxgb3i_ddp_init(struct cxgbi_device *cdev)
1222 {
1223         struct t3cdev *tdev = (struct t3cdev *)cdev->lldev;
1224         struct net_device *ndev = cdev->ports[0];
1225         struct cxgbi_tag_format tformat;
1226         unsigned int ppmax, tagmask = 0;
1227         struct ulp_iscsi_info uinfo;
1228         int i, err;
1229
1230         err = tdev->ctl(tdev, ULP_ISCSI_GET_PARAMS, &uinfo);
1231         if (err < 0) {
1232                 pr_err("%s, failed to get iscsi param %d.\n",
1233                        ndev->name, err);
1234                 return err;
1235         }
1236         if (uinfo.llimit >= uinfo.ulimit) {
1237                 pr_warn("T3 %s, iscsi NOT enabled %u ~ %u!\n",
1238                         ndev->name, uinfo.llimit, uinfo.ulimit);
1239                 return -EACCES;
1240         }
1241
1242         ppmax = (uinfo.ulimit - uinfo.llimit + 1) >> PPOD_SIZE_SHIFT;
1243         tagmask = cxgbi_tagmask_set(ppmax);
1244
1245         pr_info("T3 %s: 0x%x~0x%x, 0x%x, tagmask 0x%x -> 0x%x.\n",
1246                 ndev->name, uinfo.llimit, uinfo.ulimit, ppmax, uinfo.tagmask,
1247                 tagmask);
1248
1249         memset(&tformat, 0, sizeof(struct cxgbi_tag_format));
1250         for (i = 0; i < 4; i++)
1251                 tformat.pgsz_order[i] = uinfo.pgsz_factor[i];
1252         cxgbi_tagmask_check(tagmask, &tformat);
1253
1254         err = cxgbi_ddp_ppm_setup(&tdev->ulp_iscsi, cdev, &tformat,
1255                                   (uinfo.ulimit - uinfo.llimit + 1),
1256                                   uinfo.llimit, uinfo.llimit, 0, 0, 0);
1257         if (err)
1258                 return err;
1259
1260         if (!(cdev->flags & CXGBI_FLAG_DDP_OFF)) {
1261                 uinfo.tagmask = tagmask;
1262                 uinfo.ulimit = uinfo.llimit + (ppmax << PPOD_SIZE_SHIFT);
1263
1264                 err = tdev->ctl(tdev, ULP_ISCSI_SET_PARAMS, &uinfo);
1265                 if (err < 0) {
1266                         pr_err("T3 %s fail to set iscsi param %d.\n",
1267                                ndev->name, err);
1268                         cdev->flags |= CXGBI_FLAG_DDP_OFF;
1269                 }
1270                 err = 0;
1271         }
1272
1273         cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
1274         cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
1275         cdev->csk_ddp_set_map = ddp_set_map;
1276         cdev->csk_ddp_clear_map = ddp_clear_map;
1277         cdev->cdev2ppm = cdev2ppm;
1278         cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1279                                   uinfo.max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1280         cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1281                                   uinfo.max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1282
1283         return 0;
1284 }
1285
1286 static void cxgb3i_dev_close(struct t3cdev *t3dev)
1287 {
1288         struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
1289
1290         if (!cdev || cdev->flags & CXGBI_FLAG_ADAPTER_RESET) {
1291                 pr_info("0x%p close, f 0x%x.\n", cdev, cdev ? cdev->flags : 0);
1292                 return;
1293         }
1294
1295         cxgbi_device_unregister(cdev);
1296 }
1297
1298 /**
1299  * cxgb3i_dev_open - init a t3 adapter structure and any h/w settings
1300  * @t3dev: t3cdev adapter
1301  */
1302 static void cxgb3i_dev_open(struct t3cdev *t3dev)
1303 {
1304         struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
1305         struct adapter *adapter = tdev2adap(t3dev);
1306         int i, err;
1307
1308         if (cdev) {
1309                 pr_info("0x%p, updating.\n", cdev);
1310                 return;
1311         }
1312
1313         cdev = cxgbi_device_register(0, adapter->params.nports);
1314         if (!cdev) {
1315                 pr_warn("device 0x%p register failed.\n", t3dev);
1316                 return;
1317         }
1318
1319         cdev->flags = CXGBI_FLAG_DEV_T3 | CXGBI_FLAG_IPV4_SET;
1320         cdev->lldev = t3dev;
1321         cdev->pdev = adapter->pdev;
1322         cdev->ports = adapter->port;
1323         cdev->nports = adapter->params.nports;
1324         cdev->mtus = adapter->params.mtus;
1325         cdev->nmtus = NMTUS;
1326         cdev->rx_credit_thres = cxgb3i_rx_credit_thres;
1327         cdev->skb_tx_rsvd = CXGB3I_TX_HEADER_LEN;
1328         cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr_norss);
1329         cdev->itp = &cxgb3i_iscsi_transport;
1330
1331         err = cxgb3i_ddp_init(cdev);
1332         if (err) {
1333                 pr_info("0x%p ddp init failed %d\n", cdev, err);
1334                 goto err_out;
1335         }
1336
1337         err = cxgb3i_ofld_init(cdev);
1338         if (err) {
1339                 pr_info("0x%p offload init failed\n", cdev);
1340                 goto err_out;
1341         }
1342
1343         err = cxgbi_hbas_add(cdev, CXGB3I_MAX_LUN, CXGBI_MAX_CONN,
1344                                 &cxgb3i_host_template, cxgb3i_stt);
1345         if (err)
1346                 goto err_out;
1347
1348         for (i = 0; i < cdev->nports; i++)
1349                 cdev->hbas[i]->ipv4addr =
1350                         cxgb3i_get_private_ipv4addr(cdev->ports[i]);
1351
1352         pr_info("cdev 0x%p, f 0x%x, t3dev 0x%p open, err %d.\n",
1353                 cdev, cdev ? cdev->flags : 0, t3dev, err);
1354         return;
1355
1356 err_out:
1357         cxgbi_device_unregister(cdev);
1358 }
1359
1360 static void cxgb3i_dev_event_handler(struct t3cdev *t3dev, u32 event, u32 port)
1361 {
1362         struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
1363
1364         log_debug(1 << CXGBI_DBG_TOE,
1365                 "0x%p, cdev 0x%p, event 0x%x, port 0x%x.\n",
1366                 t3dev, cdev, event, port);
1367         if (!cdev)
1368                 return;
1369
1370         switch (event) {
1371         case OFFLOAD_STATUS_DOWN:
1372                 cdev->flags |= CXGBI_FLAG_ADAPTER_RESET;
1373                 break;
1374         case OFFLOAD_STATUS_UP:
1375                 cdev->flags &= ~CXGBI_FLAG_ADAPTER_RESET;
1376                 break;
1377         }
1378 }
1379
1380 /**
1381  * cxgb3i_init_module - module init entry point
1382  *
1383  * initialize any driver wide global data structures and register itself
1384  *      with the cxgb3 module
1385  */
1386 static int __init cxgb3i_init_module(void)
1387 {
1388         int rc;
1389
1390         printk(KERN_INFO "%s", version);
1391
1392         rc = cxgbi_iscsi_init(&cxgb3i_iscsi_transport, &cxgb3i_stt);
1393         if (rc < 0)
1394                 return rc;
1395
1396         cxgb3_register_client(&t3_client);
1397         return 0;
1398 }
1399
1400 /**
1401  * cxgb3i_exit_module - module cleanup/exit entry point
1402  *
1403  * go through the driver hba list and for each hba, release any resource held.
1404  *      and unregisters iscsi transport and the cxgb3 module
1405  */
1406 static void __exit cxgb3i_exit_module(void)
1407 {
1408         cxgb3_unregister_client(&t3_client);
1409         cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T3);
1410         cxgbi_iscsi_cleanup(&cxgb3i_iscsi_transport, &cxgb3i_stt);
1411 }
1412
1413 module_init(cxgb3i_init_module);
1414 module_exit(cxgb3i_exit_module);