kernel/drivers/net/ethernet/chelsio/cxgb3/cxgb3_offload.c

   1 /*
   2  * Copyright (c) 2006-2008 Chelsio, Inc. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  34
  35 #include <linux/list.h>
  36 #include <linux/slab.h>
  37 #include <net/neighbour.h>
  38 #include <linux/notifier.h>
  39 #include <linux/atomic.h>
  40 #include <linux/proc_fs.h>
  41 #include <linux/if_vlan.h>
  42 #include <net/netevent.h>
  43 #include <linux/highmem.h>
  44 #include <linux/vmalloc.h>
  45 #include <linux/export.h>
  46
  47 #include "common.h"
  48 #include "regs.h"
  49 #include "cxgb3_ioctl.h"
  50 #include "cxgb3_ctl_defs.h"
  51 #include "cxgb3_defs.h"
  52 #include "l2t.h"
  53 #include "firmware_exports.h"
  54 #include "cxgb3_offload.h"
  55
  56 static LIST_HEAD(client_list);
  57 static LIST_HEAD(ofld_dev_list);
  58 static DEFINE_MUTEX(cxgb3_db_lock);
  59
  60 static DEFINE_RWLOCK(adapter_list_lock);
  61 static LIST_HEAD(adapter_list);
  62
  63 static const unsigned int MAX_ATIDS = 64 * 1024;
  64 static const unsigned int ATID_BASE = 0x10000;
  65
  66 static void cxgb_neigh_update(struct neighbour *neigh);
  67 static void cxgb_redirect(struct dst_entry *old, struct dst_entry *new,
  68                           struct neighbour *neigh, const void *daddr);
  69
  70 static inline int offload_activated(struct t3cdev *tdev)
  71 {
  72         const struct adapter *adapter = tdev2adap(tdev);
  73
  74         return test_bit(OFFLOAD_DEVMAP_BIT, &adapter->open_device_map);
  75 }
  76
  77 /**
  78  *      cxgb3_register_client - register an offload client
  79  *      @client: the client
  80  *
  81  *      Add the client to the client list,
  82  *      and call backs the client for each activated offload device
  83  */
  84 void cxgb3_register_client(struct cxgb3_client *client)
  85 {
  86         struct t3cdev *tdev;
  87
  88         mutex_lock(&cxgb3_db_lock);
  89         list_add_tail(&client->client_list, &client_list);
  90
  91         if (client->add) {
  92                 list_for_each_entry(tdev, &ofld_dev_list, ofld_dev_list) {
  93                         if (offload_activated(tdev))
  94                                 client->add(tdev);
  95                 }
  96         }
  97         mutex_unlock(&cxgb3_db_lock);
  98 }
  99
 100 EXPORT_SYMBOL(cxgb3_register_client);
 101
 102 /**
 103  *      cxgb3_unregister_client - unregister an offload client
 104  *      @client: the client
 105  *
 106  *      Remove the client to the client list,
 107  *      and call backs the client for each activated offload device.
 108  */
 109 void cxgb3_unregister_client(struct cxgb3_client *client)
 110 {
 111         struct t3cdev *tdev;
 112
 113         mutex_lock(&cxgb3_db_lock);
 114         list_del(&client->client_list);
 115
 116         if (client->remove) {
 117                 list_for_each_entry(tdev, &ofld_dev_list, ofld_dev_list) {
 118                         if (offload_activated(tdev))
 119                                 client->remove(tdev);
 120                 }
 121         }
 122         mutex_unlock(&cxgb3_db_lock);
 123 }
 124
 125 EXPORT_SYMBOL(cxgb3_unregister_client);
 126
 127 /**
 128  *      cxgb3_add_clients - activate registered clients for an offload device
 129  *      @tdev: the offload device
 130  *
 131  *      Call backs all registered clients once a offload device is activated
 132  */
 133 void cxgb3_add_clients(struct t3cdev *tdev)
 134 {
 135         struct cxgb3_client *client;
 136
 137         mutex_lock(&cxgb3_db_lock);
 138         list_for_each_entry(client, &client_list, client_list) {
 139                 if (client->add)
 140                         client->add(tdev);
 141         }
 142         mutex_unlock(&cxgb3_db_lock);
 143 }
 144
 145 /**
 146  *      cxgb3_remove_clients - deactivates registered clients
 147  *                             for an offload device
 148  *      @tdev: the offload device
 149  *
 150  *      Call backs all registered clients once a offload device is deactivated
 151  */
 152 void cxgb3_remove_clients(struct t3cdev *tdev)
 153 {
 154         struct cxgb3_client *client;
 155
 156         mutex_lock(&cxgb3_db_lock);
 157         list_for_each_entry(client, &client_list, client_list) {
 158                 if (client->remove)
 159                         client->remove(tdev);
 160         }
 161         mutex_unlock(&cxgb3_db_lock);
 162 }
 163
 164 void cxgb3_event_notify(struct t3cdev *tdev, u32 event, u32 port)
 165 {
 166         struct cxgb3_client *client;
 167
 168         mutex_lock(&cxgb3_db_lock);
 169         list_for_each_entry(client, &client_list, client_list) {
 170                 if (client->event_handler)
 171                         client->event_handler(tdev, event, port);
 172         }
 173         mutex_unlock(&cxgb3_db_lock);
 174 }
 175
 176 static struct net_device *get_iff_from_mac(struct adapter *adapter,
 177                                            const unsigned char *mac,
 178                                            unsigned int vlan)
 179 {
 180         int i;
 181
 182         for_each_port(adapter, i) {
 183                 struct net_device *dev = adapter->port[i];
 184
 185                 if (ether_addr_equal(dev->dev_addr, mac)) {
 186                         rcu_read_lock();
 187                         if (vlan && vlan != VLAN_VID_MASK) {
 188                                 dev = __vlan_find_dev_deep_rcu(dev, htons(ETH_P_8021Q), vlan);
 189                         } else if (netif_is_bond_slave(dev)) {
 190                                 struct net_device *upper_dev;
 191
 192                                 while ((upper_dev =
 193                                         netdev_master_upper_dev_get_rcu(dev)))
 194                                         dev = upper_dev;
 195                         }
 196                         rcu_read_unlock();
 197                         return dev;
 198                 }
 199         }
 200         return NULL;
 201 }
 202
 203 static int cxgb_ulp_iscsi_ctl(struct adapter *adapter, unsigned int req,
 204                               void *data)
 205 {
 206         int i;
 207         int ret = 0;
 208         unsigned int val = 0;
 209         struct ulp_iscsi_info *uiip = data;
 210
 211         switch (req) {
 212         case ULP_ISCSI_GET_PARAMS:
 213                 uiip->pdev = adapter->pdev;
 214                 uiip->llimit = t3_read_reg(adapter, A_ULPRX_ISCSI_LLIMIT);
 215                 uiip->ulimit = t3_read_reg(adapter, A_ULPRX_ISCSI_ULIMIT);
 216                 uiip->tagmask = t3_read_reg(adapter, A_ULPRX_ISCSI_TAGMASK);
 217
 218                 val = t3_read_reg(adapter, A_ULPRX_ISCSI_PSZ);
 219                 for (i = 0; i < 4; i++, val >>= 8)
 220                         uiip->pgsz_factor[i] = val & 0xFF;
 221
 222                 val = t3_read_reg(adapter, A_TP_PARA_REG7);
 223                 uiip->max_txsz =
 224                 uiip->max_rxsz = min((val >> S_PMMAXXFERLEN0)&M_PMMAXXFERLEN0,
 225                                      (val >> S_PMMAXXFERLEN1)&M_PMMAXXFERLEN1);
 226                 /*
 227                  * On tx, the iscsi pdu has to be <= tx page size and has to
 228                  * fit into the Tx PM FIFO.
 229                  */
 230                 val = min(adapter->params.tp.tx_pg_size,
 231                           t3_read_reg(adapter, A_PM1_TX_CFG) >> 17);
 232                 uiip->max_txsz = min(val, uiip->max_txsz);
 233
 234                 /* set MaxRxData to 16224 */
 235                 val = t3_read_reg(adapter, A_TP_PARA_REG2);
 236                 if ((val >> S_MAXRXDATA) != 0x3f60) {
 237                         val &= (M_RXCOALESCESIZE << S_RXCOALESCESIZE);
 238                         val |= V_MAXRXDATA(0x3f60);
 239                         pr_info("%s, iscsi set MaxRxData to 16224 (0x%x)\n",
 240                                 adapter->name, val);
 241                         t3_write_reg(adapter, A_TP_PARA_REG2, val);
 242                 }
 243
 244                 /*
 245                  * on rx, the iscsi pdu has to be < rx page size and the
 246                  * the max rx data length programmed in TP
 247                  */
 248                 val = min(adapter->params.tp.rx_pg_size,
 249                           ((t3_read_reg(adapter, A_TP_PARA_REG2)) >>
 250                                 S_MAXRXDATA) & M_MAXRXDATA);
 251                 uiip->max_rxsz = min(val, uiip->max_rxsz);
 252                 break;
 253         case ULP_ISCSI_SET_PARAMS:
 254                 t3_write_reg(adapter, A_ULPRX_ISCSI_TAGMASK, uiip->tagmask);
 255                 /* program the ddp page sizes */
 256                 for (i = 0; i < 4; i++)
 257                         val |= (uiip->pgsz_factor[i] & 0xF) << (8 * i);
 258                 if (val && (val != t3_read_reg(adapter, A_ULPRX_ISCSI_PSZ))) {
 259                         pr_info("%s, setting iscsi pgsz 0x%x, %u,%u,%u,%u\n",
 260                                 adapter->name, val, uiip->pgsz_factor[0],
 261                                 uiip->pgsz_factor[1], uiip->pgsz_factor[2],
 262                                 uiip->pgsz_factor[3]);
 263                         t3_write_reg(adapter, A_ULPRX_ISCSI_PSZ, val);
 264                 }
 265                 break;
 266         default:
 267                 ret = -EOPNOTSUPP;
 268         }
 269         return ret;
 270 }
 271
 272 /* Response queue used for RDMA events. */
 273 #define ASYNC_NOTIF_RSPQ 0
 274
 275 static int cxgb_rdma_ctl(struct adapter *adapter, unsigned int req, void *data)
 276 {
 277         int ret = 0;
 278
 279         switch (req) {
 280         case RDMA_GET_PARAMS: {
 281                 struct rdma_info *rdma = data;
 282                 struct pci_dev *pdev = adapter->pdev;
 283
 284                 rdma->udbell_physbase = pci_resource_start(pdev, 2);
 285                 rdma->udbell_len = pci_resource_len(pdev, 2);
 286                 rdma->tpt_base =
 287                         t3_read_reg(adapter, A_ULPTX_TPT_LLIMIT);
 288                 rdma->tpt_top = t3_read_reg(adapter, A_ULPTX_TPT_ULIMIT);
 289                 rdma->pbl_base =
 290                         t3_read_reg(adapter, A_ULPTX_PBL_LLIMIT);
 291                 rdma->pbl_top = t3_read_reg(adapter, A_ULPTX_PBL_ULIMIT);
 292                 rdma->rqt_base = t3_read_reg(adapter, A_ULPRX_RQ_LLIMIT);
 293                 rdma->rqt_top = t3_read_reg(adapter, A_ULPRX_RQ_ULIMIT);
 294                 rdma->kdb_addr = adapter->regs + A_SG_KDOORBELL;
 295                 rdma->pdev = pdev;
 296                 break;
 297         }
 298         case RDMA_CQ_OP:{
 299                 unsigned long flags;
 300                 struct rdma_cq_op *rdma = data;
 301
 302                 /* may be called in any context */
 303                 spin_lock_irqsave(&adapter->sge.reg_lock, flags);
 304                 ret = t3_sge_cqcntxt_op(adapter, rdma->id, rdma->op,
 305                                         rdma->credits);
 306                 spin_unlock_irqrestore(&adapter->sge.reg_lock, flags);
 307                 break;
 308         }
 309         case RDMA_GET_MEM:{
 310                 struct ch_mem_range *t = data;
 311                 struct mc7 *mem;
 312
 313                 if ((t->addr & 7) || (t->len & 7))
 314                         return -EINVAL;
 315                 if (t->mem_id == MEM_CM)
 316                         mem = &adapter->cm;
 317                 else if (t->mem_id == MEM_PMRX)
 318                         mem = &adapter->pmrx;
 319                 else if (t->mem_id == MEM_PMTX)
 320                         mem = &adapter->pmtx;
 321                 else
 322                         return -EINVAL;
 323
 324                 ret =
 325                         t3_mc7_bd_read(mem, t->addr / 8, t->len / 8,
 326                                         (u64 *) t->buf);
 327                 if (ret)
 328                         return ret;
 329                 break;
 330         }
 331         case RDMA_CQ_SETUP:{
 332                 struct rdma_cq_setup *rdma = data;
 333
 334                 spin_lock_irq(&adapter->sge.reg_lock);
 335                 ret =
 336                         t3_sge_init_cqcntxt(adapter, rdma->id,
 337                                         rdma->base_addr, rdma->size,
 338                                         ASYNC_NOTIF_RSPQ,
 339                                         rdma->ovfl_mode, rdma->credits,
 340                                         rdma->credit_thres);
 341                 spin_unlock_irq(&adapter->sge.reg_lock);
 342                 break;
 343         }
 344         case RDMA_CQ_DISABLE:
 345                 spin_lock_irq(&adapter->sge.reg_lock);
 346                 ret = t3_sge_disable_cqcntxt(adapter, *(unsigned int *)data);
 347                 spin_unlock_irq(&adapter->sge.reg_lock);
 348                 break;
 349         case RDMA_CTRL_QP_SETUP:{
 350                 struct rdma_ctrlqp_setup *rdma = data;
 351
 352                 spin_lock_irq(&adapter->sge.reg_lock);
 353                 ret = t3_sge_init_ecntxt(adapter, FW_RI_SGEEC_START, 0,
 354                                                 SGE_CNTXT_RDMA,
 355                                                 ASYNC_NOTIF_RSPQ,
 356                                                 rdma->base_addr, rdma->size,
 357                                                 FW_RI_TID_START, 1, 0);
 358                 spin_unlock_irq(&adapter->sge.reg_lock);
 359                 break;
 360         }
 361         case RDMA_GET_MIB: {
 362                 spin_lock(&adapter->stats_lock);
 363                 t3_tp_get_mib_stats(adapter, (struct tp_mib_stats *)data);
 364                 spin_unlock(&adapter->stats_lock);
 365                 break;
 366         }
 367         default:
 368                 ret = -EOPNOTSUPP;
 369         }
 370         return ret;
 371 }
 372
 373 static int cxgb_offload_ctl(struct t3cdev *tdev, unsigned int req, void *data)
 374 {
 375         struct adapter *adapter = tdev2adap(tdev);
 376         struct tid_range *tid;
 377         struct mtutab *mtup;
 378         struct iff_mac *iffmacp;
 379         struct ddp_params *ddpp;
 380         struct adap_ports *ports;
 381         struct ofld_page_info *rx_page_info;
 382         struct tp_params *tp = &adapter->params.tp;
 383         int i;
 384
 385         switch (req) {
 386         case GET_MAX_OUTSTANDING_WR:
 387                 *(unsigned int *)data = FW_WR_NUM;
 388                 break;
 389         case GET_WR_LEN:
 390                 *(unsigned int *)data = WR_FLITS;
 391                 break;
 392         case GET_TX_MAX_CHUNK:
 393                 *(unsigned int *)data = 1 << 20;        /* 1MB */
 394                 break;
 395         case GET_TID_RANGE:
 396                 tid = data;
 397                 tid->num = t3_mc5_size(&adapter->mc5) -
 398                     adapter->params.mc5.nroutes -
 399                     adapter->params.mc5.nfilters - adapter->params.mc5.nservers;
 400                 tid->base = 0;
 401                 break;
 402         case GET_STID_RANGE:
 403                 tid = data;
 404                 tid->num = adapter->params.mc5.nservers;
 405                 tid->base = t3_mc5_size(&adapter->mc5) - tid->num -
 406                     adapter->params.mc5.nfilters - adapter->params.mc5.nroutes;
 407                 break;
 408         case GET_L2T_CAPACITY:
 409                 *(unsigned int *)data = 2048;
 410                 break;
 411         case GET_MTUS:
 412                 mtup = data;
 413                 mtup->size = NMTUS;
 414                 mtup->mtus = adapter->params.mtus;
 415                 break;
 416         case GET_IFF_FROM_MAC:
 417                 iffmacp = data;
 418                 iffmacp->dev = get_iff_from_mac(adapter, iffmacp->mac_addr,
 419                                                 iffmacp->vlan_tag &
 420                                                 VLAN_VID_MASK);
 421                 break;
 422         case GET_DDP_PARAMS:
 423                 ddpp = data;
 424                 ddpp->llimit = t3_read_reg(adapter, A_ULPRX_TDDP_LLIMIT);
 425                 ddpp->ulimit = t3_read_reg(adapter, A_ULPRX_TDDP_ULIMIT);
 426                 ddpp->tag_mask = t3_read_reg(adapter, A_ULPRX_TDDP_TAGMASK);
 427                 break;
 428         case GET_PORTS:
 429                 ports = data;
 430                 ports->nports = adapter->params.nports;
 431                 for_each_port(adapter, i)
 432                         ports->lldevs[i] = adapter->port[i];
 433                 break;
 434         case ULP_ISCSI_GET_PARAMS:
 435         case ULP_ISCSI_SET_PARAMS:
 436                 if (!offload_running(adapter))
 437                         return -EAGAIN;
 438                 return cxgb_ulp_iscsi_ctl(adapter, req, data);
 439         case RDMA_GET_PARAMS:
 440         case RDMA_CQ_OP:
 441         case RDMA_CQ_SETUP:
 442         case RDMA_CQ_DISABLE:
 443         case RDMA_CTRL_QP_SETUP:
 444         case RDMA_GET_MEM:
 445         case RDMA_GET_MIB:
 446                 if (!offload_running(adapter))
 447                         return -EAGAIN;
 448                 return cxgb_rdma_ctl(adapter, req, data);
 449         case GET_RX_PAGE_INFO:
 450                 rx_page_info = data;
 451                 rx_page_info->page_size = tp->rx_pg_size;
 452                 rx_page_info->num = tp->rx_num_pgs;
 453                 break;
 454         case GET_ISCSI_IPV4ADDR: {
 455                 struct iscsi_ipv4addr *p = data;
 456                 struct port_info *pi = netdev_priv(p->dev);
 457                 p->ipv4addr = pi->iscsi_ipv4addr;
 458                 break;
 459         }
 460         case GET_EMBEDDED_INFO: {
 461                 struct ch_embedded_info *e = data;
 462
 463                 spin_lock(&adapter->stats_lock);
 464                 t3_get_fw_version(adapter, &e->fw_vers);
 465                 t3_get_tp_version(adapter, &e->tp_vers);
 466                 spin_unlock(&adapter->stats_lock);
 467                 break;
 468         }
 469         default:
 470                 return -EOPNOTSUPP;
 471         }
 472         return 0;
 473 }
 474
 475 /*
 476  * Dummy handler for Rx offload packets in case we get an offload packet before
 477  * proper processing is setup.  This complains and drops the packet as it isn't
 478  * normal to get offload packets at this stage.
 479  */
 480 static int rx_offload_blackhole(struct t3cdev *dev, struct sk_buff **skbs,
 481                                 int n)
 482 {
 483         while (n--)
 484                 dev_kfree_skb_any(skbs[n]);
 485         return 0;
 486 }
 487
 488 static void dummy_neigh_update(struct t3cdev *dev, struct neighbour *neigh)
 489 {
 490 }
 491
 492 void cxgb3_set_dummy_ops(struct t3cdev *dev)
 493 {
 494         dev->recv = rx_offload_blackhole;
 495         dev->neigh_update = dummy_neigh_update;
 496 }
 497
 498 /*
 499  * Free an active-open TID.
 500  */
 501 void *cxgb3_free_atid(struct t3cdev *tdev, int atid)
 502 {
 503         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 504         union active_open_entry *p = atid2entry(t, atid);
 505         void *ctx = p->t3c_tid.ctx;
 506
 507         spin_lock_bh(&t->atid_lock);
 508         p->next = t->afree;
 509         t->afree = p;
 510         t->atids_in_use--;
 511         spin_unlock_bh(&t->atid_lock);
 512
 513         return ctx;
 514 }
 515
 516 EXPORT_SYMBOL(cxgb3_free_atid);
 517
 518 /*
 519  * Free a server TID and return it to the free pool.
 520  */
 521 void cxgb3_free_stid(struct t3cdev *tdev, int stid)
 522 {
 523         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 524         union listen_entry *p = stid2entry(t, stid);
 525
 526         spin_lock_bh(&t->stid_lock);
 527         p->next = t->sfree;
 528         t->sfree = p;
 529         t->stids_in_use--;
 530         spin_unlock_bh(&t->stid_lock);
 531 }
 532
 533 EXPORT_SYMBOL(cxgb3_free_stid);
 534
 535 void cxgb3_insert_tid(struct t3cdev *tdev, struct cxgb3_client *client,
 536                       void *ctx, unsigned int tid)
 537 {
 538         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 539
 540         t->tid_tab[tid].client = client;
 541         t->tid_tab[tid].ctx = ctx;
 542         atomic_inc(&t->tids_in_use);
 543 }
 544
 545 EXPORT_SYMBOL(cxgb3_insert_tid);
 546
 547 /*
 548  * Populate a TID_RELEASE WR.  The skb must be already propely sized.
 549  */
 550 static inline void mk_tid_release(struct sk_buff *skb, unsigned int tid)
 551 {
 552         struct cpl_tid_release *req;
 553
 554         skb->priority = CPL_PRIORITY_SETUP;
 555         req = (struct cpl_tid_release *)__skb_put(skb, sizeof(*req));
 556         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 557         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_TID_RELEASE, tid));
 558 }
 559
 560 static void t3_process_tid_release_list(struct work_struct *work)
 561 {
 562         struct t3c_data *td = container_of(work, struct t3c_data,
 563                                            tid_release_task);
 564         struct sk_buff *skb;
 565         struct t3cdev *tdev = td->dev;
 566
 567
 568         spin_lock_bh(&td->tid_release_lock);
 569         while (td->tid_release_list) {
 570                 struct t3c_tid_entry *p = td->tid_release_list;
 571
 572                 td->tid_release_list = p->ctx;
 573                 spin_unlock_bh(&td->tid_release_lock);
 574
 575                 skb = alloc_skb(sizeof(struct cpl_tid_release),
 576                                 GFP_KERNEL);
 577                 if (!skb)
 578                         skb = td->nofail_skb;
 579                 if (!skb) {
 580                         spin_lock_bh(&td->tid_release_lock);
 581                         p->ctx = (void *)td->tid_release_list;
 582                         td->tid_release_list = p;
 583                         break;
 584                 }
 585                 mk_tid_release(skb, p - td->tid_maps.tid_tab);
 586                 cxgb3_ofld_send(tdev, skb);
 587                 p->ctx = NULL;
 588                 if (skb == td->nofail_skb)
 589                         td->nofail_skb =
 590                                 alloc_skb(sizeof(struct cpl_tid_release),
 591                                         GFP_KERNEL);
 592                 spin_lock_bh(&td->tid_release_lock);
 593         }
 594         td->release_list_incomplete = (td->tid_release_list == NULL) ? 0 : 1;
 595         spin_unlock_bh(&td->tid_release_lock);
 596
 597         if (!td->nofail_skb)
 598                 td->nofail_skb =
 599                         alloc_skb(sizeof(struct cpl_tid_release),
 600                                 GFP_KERNEL);
 601 }
 602
 603 /* use ctx as a next pointer in the tid release list */
 604 void cxgb3_queue_tid_release(struct t3cdev *tdev, unsigned int tid)
 605 {
 606         struct t3c_data *td = T3C_DATA(tdev);
 607         struct t3c_tid_entry *p = &td->tid_maps.tid_tab[tid];
 608
 609         spin_lock_bh(&td->tid_release_lock);
 610         p->ctx = (void *)td->tid_release_list;
 611         p->client = NULL;
 612         td->tid_release_list = p;
 613         if (!p->ctx || td->release_list_incomplete)
 614                 schedule_work(&td->tid_release_task);
 615         spin_unlock_bh(&td->tid_release_lock);
 616 }
 617
 618 EXPORT_SYMBOL(cxgb3_queue_tid_release);
 619
 620 /*
 621  * Remove a tid from the TID table.  A client may defer processing its last
 622  * CPL message if it is locked at the time it arrives, and while the message
 623  * sits in the client's backlog the TID may be reused for another connection.
 624  * To handle this we atomically switch the TID association if it still points
 625  * to the original client context.
 626  */
 627 void cxgb3_remove_tid(struct t3cdev *tdev, void *ctx, unsigned int tid)
 628 {
 629         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 630
 631         BUG_ON(tid >= t->ntids);
 632         if (tdev->type == T3A)
 633                 (void)cmpxchg(&t->tid_tab[tid].ctx, ctx, NULL);
 634         else {
 635                 struct sk_buff *skb;
 636
 637                 skb = alloc_skb(sizeof(struct cpl_tid_release), GFP_ATOMIC);
 638                 if (likely(skb)) {
 639                         mk_tid_release(skb, tid);
 640                         cxgb3_ofld_send(tdev, skb);
 641                         t->tid_tab[tid].ctx = NULL;
 642                 } else
 643                         cxgb3_queue_tid_release(tdev, tid);
 644         }
 645         atomic_dec(&t->tids_in_use);
 646 }
 647
 648 EXPORT_SYMBOL(cxgb3_remove_tid);
 649
 650 int cxgb3_alloc_atid(struct t3cdev *tdev, struct cxgb3_client *client,
 651                      void *ctx)
 652 {
 653         int atid = -1;
 654         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 655
 656         spin_lock_bh(&t->atid_lock);
 657         if (t->afree &&
 658             t->atids_in_use + atomic_read(&t->tids_in_use) + MC5_MIN_TIDS <=
 659             t->ntids) {
 660                 union active_open_entry *p = t->afree;
 661
 662                 atid = (p - t->atid_tab) + t->atid_base;
 663                 t->afree = p->next;
 664                 p->t3c_tid.ctx = ctx;
 665                 p->t3c_tid.client = client;
 666                 t->atids_in_use++;
 667         }
 668         spin_unlock_bh(&t->atid_lock);
 669         return atid;
 670 }
 671
 672 EXPORT_SYMBOL(cxgb3_alloc_atid);
 673
 674 int cxgb3_alloc_stid(struct t3cdev *tdev, struct cxgb3_client *client,
 675                      void *ctx)
 676 {
 677         int stid = -1;
 678         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 679
 680         spin_lock_bh(&t->stid_lock);
 681         if (t->sfree) {
 682                 union listen_entry *p = t->sfree;
 683
 684                 stid = (p - t->stid_tab) + t->stid_base;
 685                 t->sfree = p->next;
 686                 p->t3c_tid.ctx = ctx;
 687                 p->t3c_tid.client = client;
 688                 t->stids_in_use++;
 689         }
 690         spin_unlock_bh(&t->stid_lock);
 691         return stid;
 692 }
 693
 694 EXPORT_SYMBOL(cxgb3_alloc_stid);
 695
 696 /* Get the t3cdev associated with a net_device */
 697 struct t3cdev *dev2t3cdev(struct net_device *dev)
 698 {
 699         const struct port_info *pi = netdev_priv(dev);
 700
 701         return (struct t3cdev *)pi->adapter;
 702 }
 703
 704 EXPORT_SYMBOL(dev2t3cdev);
 705
 706 static int do_smt_write_rpl(struct t3cdev *dev, struct sk_buff *skb)
 707 {
 708         struct cpl_smt_write_rpl *rpl = cplhdr(skb);
 709
 710         if (rpl->status != CPL_ERR_NONE)
 711                 pr_err("Unexpected SMT_WRITE_RPL status %u for entry %u\n",
 712                        rpl->status, GET_TID(rpl));
 713
 714         return CPL_RET_BUF_DONE;
 715 }
 716
 717 static int do_l2t_write_rpl(struct t3cdev *dev, struct sk_buff *skb)
 718 {
 719         struct cpl_l2t_write_rpl *rpl = cplhdr(skb);
 720
 721         if (rpl->status != CPL_ERR_NONE)
 722                 pr_err("Unexpected L2T_WRITE_RPL status %u for entry %u\n",
 723                        rpl->status, GET_TID(rpl));
 724
 725         return CPL_RET_BUF_DONE;
 726 }
 727
 728 static int do_rte_write_rpl(struct t3cdev *dev, struct sk_buff *skb)
 729 {
 730         struct cpl_rte_write_rpl *rpl = cplhdr(skb);
 731
 732         if (rpl->status != CPL_ERR_NONE)
 733                 pr_err("Unexpected RTE_WRITE_RPL status %u for entry %u\n",
 734                        rpl->status, GET_TID(rpl));
 735
 736         return CPL_RET_BUF_DONE;
 737 }
 738
 739 static int do_act_open_rpl(struct t3cdev *dev, struct sk_buff *skb)
 740 {
 741         struct cpl_act_open_rpl *rpl = cplhdr(skb);
 742         unsigned int atid = G_TID(ntohl(rpl->atid));
 743         struct t3c_tid_entry *t3c_tid;
 744
 745         t3c_tid = lookup_atid(&(T3C_DATA(dev))->tid_maps, atid);
 746         if (t3c_tid && t3c_tid->ctx && t3c_tid->client &&
 747             t3c_tid->client->handlers &&
 748             t3c_tid->client->handlers[CPL_ACT_OPEN_RPL]) {
 749                 return t3c_tid->client->handlers[CPL_ACT_OPEN_RPL] (dev, skb,
 750                                                                     t3c_tid->
 751                                                                     ctx);
 752         } else {
 753                 pr_err("%s: received clientless CPL command 0x%x\n",
 754                        dev->name, CPL_ACT_OPEN_RPL);
 755                 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 756         }
 757 }
 758
 759 static int do_stid_rpl(struct t3cdev *dev, struct sk_buff *skb)
 760 {
 761         union opcode_tid *p = cplhdr(skb);
 762         unsigned int stid = G_TID(ntohl(p->opcode_tid));
 763         struct t3c_tid_entry *t3c_tid;
 764
 765         t3c_tid = lookup_stid(&(T3C_DATA(dev))->tid_maps, stid);
 766         if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 767             t3c_tid->client->handlers[p->opcode]) {
 768                 return t3c_tid->client->handlers[p->opcode] (dev, skb,
 769                                                              t3c_tid->ctx);
 770         } else {
 771                 pr_err("%s: received clientless CPL command 0x%x\n",
 772                        dev->name, p->opcode);
 773                 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 774         }
 775 }
 776
 777 static int do_hwtid_rpl(struct t3cdev *dev, struct sk_buff *skb)
 778 {
 779         union opcode_tid *p = cplhdr(skb);
 780         unsigned int hwtid = G_TID(ntohl(p->opcode_tid));
 781         struct t3c_tid_entry *t3c_tid;
 782
 783         t3c_tid = lookup_tid(&(T3C_DATA(dev))->tid_maps, hwtid);
 784         if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 785             t3c_tid->client->handlers[p->opcode]) {
 786                 return t3c_tid->client->handlers[p->opcode]
 787                     (dev, skb, t3c_tid->ctx);
 788         } else {
 789                 pr_err("%s: received clientless CPL command 0x%x\n",
 790                        dev->name, p->opcode);
 791                 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 792         }
 793 }
 794
 795 static int do_cr(struct t3cdev *dev, struct sk_buff *skb)
 796 {
 797         struct cpl_pass_accept_req *req = cplhdr(skb);
 798         unsigned int stid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
 799         struct tid_info *t = &(T3C_DATA(dev))->tid_maps;
 800         struct t3c_tid_entry *t3c_tid;
 801         unsigned int tid = GET_TID(req);
 802
 803         if (unlikely(tid >= t->ntids)) {
 804                 printk("%s: passive open TID %u too large\n",
 805                        dev->name, tid);
 806                 t3_fatal_err(tdev2adap(dev));
 807                 return CPL_RET_BUF_DONE;
 808         }
 809
 810         t3c_tid = lookup_stid(t, stid);
 811         if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 812             t3c_tid->client->handlers[CPL_PASS_ACCEPT_REQ]) {
 813                 return t3c_tid->client->handlers[CPL_PASS_ACCEPT_REQ]
 814                     (dev, skb, t3c_tid->ctx);
 815         } else {
 816                 pr_err("%s: received clientless CPL command 0x%x\n",
 817                        dev->name, CPL_PASS_ACCEPT_REQ);
 818                 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 819         }
 820 }
 821
 822 /*
 823  * Returns an sk_buff for a reply CPL message of size len.  If the input
 824  * sk_buff has no other users it is trimmed and reused, otherwise a new buffer
 825  * is allocated.  The input skb must be of size at least len.  Note that this
 826  * operation does not destroy the original skb data even if it decides to reuse
 827  * the buffer.
 828  */
 829 static struct sk_buff *cxgb3_get_cpl_reply_skb(struct sk_buff *skb, size_t len,
 830                                                gfp_t gfp)
 831 {
 832         if (likely(!skb_cloned(skb))) {
 833                 BUG_ON(skb->len < len);
 834                 __skb_trim(skb, len);
 835                 skb_get(skb);
 836         } else {
 837                 skb = alloc_skb(len, gfp);
 838                 if (skb)
 839                         __skb_put(skb, len);
 840         }
 841         return skb;
 842 }
 843
 844 static int do_abort_req_rss(struct t3cdev *dev, struct sk_buff *skb)
 845 {
 846         union opcode_tid *p = cplhdr(skb);
 847         unsigned int hwtid = G_TID(ntohl(p->opcode_tid));
 848         struct t3c_tid_entry *t3c_tid;
 849
 850         t3c_tid = lookup_tid(&(T3C_DATA(dev))->tid_maps, hwtid);
 851         if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 852             t3c_tid->client->handlers[p->opcode]) {
 853                 return t3c_tid->client->handlers[p->opcode]
 854                     (dev, skb, t3c_tid->ctx);
 855         } else {
 856                 struct cpl_abort_req_rss *req = cplhdr(skb);
 857                 struct cpl_abort_rpl *rpl;
 858                 struct sk_buff *reply_skb;
 859                 unsigned int tid = GET_TID(req);
 860                 u8 cmd = req->status;
 861
 862                 if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
 863                     req->status == CPL_ERR_PERSIST_NEG_ADVICE)
 864                         goto out;
 865
 866                 reply_skb = cxgb3_get_cpl_reply_skb(skb,
 867                                                     sizeof(struct
 868                                                            cpl_abort_rpl),
 869                                                     GFP_ATOMIC);
 870
 871                 if (!reply_skb) {
 872                         printk("do_abort_req_rss: couldn't get skb!\n");
 873                         goto out;
 874                 }
 875                 reply_skb->priority = CPL_PRIORITY_DATA;
 876                 __skb_put(reply_skb, sizeof(struct cpl_abort_rpl));
 877                 rpl = cplhdr(reply_skb);
 878                 rpl->wr.wr_hi =
 879                     htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
 880                 rpl->wr.wr_lo = htonl(V_WR_TID(tid));
 881                 OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, tid));
 882                 rpl->cmd = cmd;
 883                 cxgb3_ofld_send(dev, reply_skb);
 884 out:
 885                 return CPL_RET_BUF_DONE;
 886         }
 887 }
 888
 889 static int do_act_establish(struct t3cdev *dev, struct sk_buff *skb)
 890 {
 891         struct cpl_act_establish *req = cplhdr(skb);
 892         unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
 893         struct tid_info *t = &(T3C_DATA(dev))->tid_maps;
 894         struct t3c_tid_entry *t3c_tid;
 895         unsigned int tid = GET_TID(req);
 896
 897         if (unlikely(tid >= t->ntids)) {
 898                 printk("%s: active establish TID %u too large\n",
 899                        dev->name, tid);
 900                 t3_fatal_err(tdev2adap(dev));
 901                 return CPL_RET_BUF_DONE;
 902         }
 903
 904         t3c_tid = lookup_atid(t, atid);
 905         if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 906             t3c_tid->client->handlers[CPL_ACT_ESTABLISH]) {
 907                 return t3c_tid->client->handlers[CPL_ACT_ESTABLISH]
 908                     (dev, skb, t3c_tid->ctx);
 909         } else {
 910                 pr_err("%s: received clientless CPL command 0x%x\n",
 911                        dev->name, CPL_ACT_ESTABLISH);
 912                 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 913         }
 914 }
 915
 916 static int do_trace(struct t3cdev *dev, struct sk_buff *skb)
 917 {
 918         struct cpl_trace_pkt *p = cplhdr(skb);
 919
 920         skb->protocol = htons(0xffff);
 921         skb->dev = dev->lldev;
 922         skb_pull(skb, sizeof(*p));
 923         skb_reset_mac_header(skb);
 924         netif_receive_skb(skb);
 925         return 0;
 926 }
 927
 928 /*
 929  * That skb would better have come from process_responses() where we abuse
 930  * ->priority and ->csum to carry our data.  NB: if we get to per-arch
 931  * ->csum, the things might get really interesting here.
 932  */
 933
 934 static inline u32 get_hwtid(struct sk_buff *skb)
 935 {
 936         return ntohl((__force __be32)skb->priority) >> 8 & 0xfffff;
 937 }
 938
 939 static inline u32 get_opcode(struct sk_buff *skb)
 940 {
 941         return G_OPCODE(ntohl((__force __be32)skb->csum));
 942 }
 943
 944 static int do_term(struct t3cdev *dev, struct sk_buff *skb)
 945 {
 946         unsigned int hwtid = get_hwtid(skb);
 947         unsigned int opcode = get_opcode(skb);
 948         struct t3c_tid_entry *t3c_tid;
 949
 950         t3c_tid = lookup_tid(&(T3C_DATA(dev))->tid_maps, hwtid);
 951         if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 952             t3c_tid->client->handlers[opcode]) {
 953                 return t3c_tid->client->handlers[opcode] (dev, skb,
 954                                                           t3c_tid->ctx);
 955         } else {
 956                 pr_err("%s: received clientless CPL command 0x%x\n",
 957                        dev->name, opcode);
 958                 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 959         }
 960 }
 961
 962 static int nb_callback(struct notifier_block *self, unsigned long event,
 963                        void *ctx)
 964 {
 965         switch (event) {
 966         case (NETEVENT_NEIGH_UPDATE):{
 967                 cxgb_neigh_update((struct neighbour *)ctx);
 968                 break;
 969         }
 970         case (NETEVENT_REDIRECT):{
 971                 struct netevent_redirect *nr = ctx;
 972                 cxgb_redirect(nr->old, nr->new, nr->neigh,
 973                               nr->daddr);
 974                 cxgb_neigh_update(nr->neigh);
 975                 break;
 976         }
 977         default:
 978                 break;
 979         }
 980         return 0;
 981 }
 982
 983 static struct notifier_block nb = {
 984         .notifier_call = nb_callback
 985 };
 986
 987 /*
 988  * Process a received packet with an unknown/unexpected CPL opcode.
 989  */
 990 static int do_bad_cpl(struct t3cdev *dev, struct sk_buff *skb)
 991 {
 992         pr_err("%s: received bad CPL command 0x%x\n", dev->name, *skb->data);
 993         return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 994 }
 995
 996 /*
 997  * Handlers for each CPL opcode
 998  */
 999 static cpl_handler_func cpl_handlers[NUM_CPL_CMDS];
1000
1001 /*
1002  * Add a new handler to the CPL dispatch table.  A NULL handler may be supplied
1003  * to unregister an existing handler.
1004  */
1005 void t3_register_cpl_handler(unsigned int opcode, cpl_handler_func h)
1006 {
1007         if (opcode < NUM_CPL_CMDS)
1008                 cpl_handlers[opcode] = h ? h : do_bad_cpl;
1009         else
1010                 pr_err("T3C: handler registration for opcode %x failed\n",
1011                        opcode);
1012 }
1013
1014 EXPORT_SYMBOL(t3_register_cpl_handler);
1015
1016 /*
1017  * T3CDEV's receive method.
1018  */
1019 static int process_rx(struct t3cdev *dev, struct sk_buff **skbs, int n)
1020 {
1021         while (n--) {
1022                 struct sk_buff *skb = *skbs++;
1023                 unsigned int opcode = get_opcode(skb);
1024                 int ret = cpl_handlers[opcode] (dev, skb);
1025
1026 #if VALIDATE_TID
1027                 if (ret & CPL_RET_UNKNOWN_TID) {
1028                         union opcode_tid *p = cplhdr(skb);
1029
1030                         pr_err("%s: CPL message (opcode %u) had unknown TID %u\n",
1031                                dev->name, opcode, G_TID(ntohl(p->opcode_tid)));
1032                 }
1033 #endif
1034                 if (ret & CPL_RET_BUF_DONE)
1035                         kfree_skb(skb);
1036         }
1037         return 0;
1038 }
1039
1040 /*
1041  * Sends an sk_buff to a T3C driver after dealing with any active network taps.
1042  */
1043 int cxgb3_ofld_send(struct t3cdev *dev, struct sk_buff *skb)
1044 {
1045         int r;
1046
1047         local_bh_disable();
1048         r = dev->send(dev, skb);
1049         local_bh_enable();
1050         return r;
1051 }
1052
1053 EXPORT_SYMBOL(cxgb3_ofld_send);
1054
1055 static int is_offloading(struct net_device *dev)
1056 {
1057         struct adapter *adapter;
1058         int i;
1059
1060         read_lock_bh(&adapter_list_lock);
1061         list_for_each_entry(adapter, &adapter_list, adapter_list) {
1062                 for_each_port(adapter, i) {
1063                         if (dev == adapter->port[i]) {
1064                                 read_unlock_bh(&adapter_list_lock);
1065                                 return 1;
1066                         }
1067                 }
1068         }
1069         read_unlock_bh(&adapter_list_lock);
1070         return 0;
1071 }
1072
1073 static void cxgb_neigh_update(struct neighbour *neigh)
1074 {
1075         struct net_device *dev;
1076
1077         if (!neigh)
1078                 return;
1079         dev = neigh->dev;
1080         if (dev && (is_offloading(dev))) {
1081                 struct t3cdev *tdev = dev2t3cdev(dev);
1082
1083                 BUG_ON(!tdev);
1084                 t3_l2t_update(tdev, neigh);
1085         }
1086 }
1087
1088 static void set_l2t_ix(struct t3cdev *tdev, u32 tid, struct l2t_entry *e)
1089 {
1090         struct sk_buff *skb;
1091         struct cpl_set_tcb_field *req;
1092
1093         skb = alloc_skb(sizeof(*req), GFP_ATOMIC);
1094         if (!skb) {
1095                 pr_err("%s: cannot allocate skb!\n", __func__);
1096                 return;
1097         }
1098         skb->priority = CPL_PRIORITY_CONTROL;
1099         req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
1100         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
1101         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1102         req->reply = 0;
1103         req->cpu_idx = 0;
1104         req->word = htons(W_TCB_L2T_IX);
1105         req->mask = cpu_to_be64(V_TCB_L2T_IX(M_TCB_L2T_IX));
1106         req->val = cpu_to_be64(V_TCB_L2T_IX(e->idx));
1107         tdev->send(tdev, skb);
1108 }
1109
1110 static void cxgb_redirect(struct dst_entry *old, struct dst_entry *new,
1111                           struct neighbour *neigh,
1112                           const void *daddr)
1113 {
1114         struct net_device *dev;
1115         struct tid_info *ti;
1116         struct t3cdev *tdev;
1117         u32 tid;
1118         int update_tcb;
1119         struct l2t_entry *e;
1120         struct t3c_tid_entry *te;
1121
1122         dev = neigh->dev;
1123
1124         if (!is_offloading(dev))
1125                 return;
1126         tdev = dev2t3cdev(dev);
1127         BUG_ON(!tdev);
1128
1129         /* Add new L2T entry */
1130         e = t3_l2t_get(tdev, new, dev, daddr);
1131         if (!e) {
1132                 pr_err("%s: couldn't allocate new l2t entry!\n", __func__);
1133                 return;
1134         }
1135
1136         /* Walk tid table and notify clients of dst change. */
1137         ti = &(T3C_DATA(tdev))->tid_maps;
1138         for (tid = 0; tid < ti->ntids; tid++) {
1139                 te = lookup_tid(ti, tid);
1140                 BUG_ON(!te);
1141                 if (te && te->ctx && te->client && te->client->redirect) {
1142                         update_tcb = te->client->redirect(te->ctx, old, new, e);
1143                         if (update_tcb) {
1144                                 rcu_read_lock();
1145                                 l2t_hold(L2DATA(tdev), e);
1146                                 rcu_read_unlock();
1147                                 set_l2t_ix(tdev, tid, e);
1148                         }
1149                 }
1150         }
1151         l2t_release(tdev, e);
1152 }
1153
1154 /*
1155  * Allocate a chunk of memory using kmalloc or, if that fails, vmalloc.
1156  * The allocated memory is cleared.
1157  */
1158 void *cxgb_alloc_mem(unsigned long size)
1159 {
1160         void *p = kzalloc(size, GFP_KERNEL | __GFP_NOWARN);
1161
1162         if (!p)
1163                 p = vzalloc(size);
1164         return p;
1165 }
1166
1167 /*
1168  * Free memory allocated through t3_alloc_mem().
1169  */
1170 void cxgb_free_mem(void *addr)
1171 {
1172         if (is_vmalloc_addr(addr))
1173                 vfree(addr);
1174         else
1175                 kfree(addr);
1176 }
1177
1178 /*
1179  * Allocate and initialize the TID tables.  Returns 0 on success.
1180  */
1181 static int init_tid_tabs(struct tid_info *t, unsigned int ntids,
1182                          unsigned int natids, unsigned int nstids,
1183                          unsigned int atid_base, unsigned int stid_base)
1184 {
1185         unsigned long size = ntids * sizeof(*t->tid_tab) +
1186             natids * sizeof(*t->atid_tab) + nstids * sizeof(*t->stid_tab);
1187
1188         t->tid_tab = cxgb_alloc_mem(size);
1189         if (!t->tid_tab)
1190                 return -ENOMEM;
1191
1192         t->stid_tab = (union listen_entry *)&t->tid_tab[ntids];
1193         t->atid_tab = (union active_open_entry *)&t->stid_tab[nstids];
1194         t->ntids = ntids;
1195         t->nstids = nstids;
1196         t->stid_base = stid_base;
1197         t->sfree = NULL;
1198         t->natids = natids;
1199         t->atid_base = atid_base;
1200         t->afree = NULL;
1201         t->stids_in_use = t->atids_in_use = 0;
1202         atomic_set(&t->tids_in_use, 0);
1203         spin_lock_init(&t->stid_lock);
1204         spin_lock_init(&t->atid_lock);
1205
1206         /*
1207          * Setup the free lists for stid_tab and atid_tab.
1208          */
1209         if (nstids) {
1210                 while (--nstids)
1211                         t->stid_tab[nstids - 1].next = &t->stid_tab[nstids];
1212                 t->sfree = t->stid_tab;
1213         }
1214         if (natids) {
1215                 while (--natids)
1216                         t->atid_tab[natids - 1].next = &t->atid_tab[natids];
1217                 t->afree = t->atid_tab;
1218         }
1219         return 0;
1220 }
1221
1222 static void free_tid_maps(struct tid_info *t)
1223 {
1224         cxgb_free_mem(t->tid_tab);
1225 }
1226
1227 static inline void add_adapter(struct adapter *adap)
1228 {
1229         write_lock_bh(&adapter_list_lock);
1230         list_add_tail(&adap->adapter_list, &adapter_list);
1231         write_unlock_bh(&adapter_list_lock);
1232 }
1233
1234 static inline void remove_adapter(struct adapter *adap)
1235 {
1236         write_lock_bh(&adapter_list_lock);
1237         list_del(&adap->adapter_list);
1238         write_unlock_bh(&adapter_list_lock);
1239 }
1240
1241 int cxgb3_offload_activate(struct adapter *adapter)
1242 {
1243         struct t3cdev *dev = &adapter->tdev;
1244         int natids, err;
1245         struct t3c_data *t;
1246         struct tid_range stid_range, tid_range;
1247         struct mtutab mtutab;
1248         unsigned int l2t_capacity;
1249         struct l2t_data *l2td;
1250
1251         t = kzalloc(sizeof(*t), GFP_KERNEL);
1252         if (!t)
1253                 return -ENOMEM;
1254
1255         err = -EOPNOTSUPP;
1256         if (dev->ctl(dev, GET_TX_MAX_CHUNK, &t->tx_max_chunk) < 0 ||
1257             dev->ctl(dev, GET_MAX_OUTSTANDING_WR, &t->max_wrs) < 0 ||
1258             dev->ctl(dev, GET_L2T_CAPACITY, &l2t_capacity) < 0 ||
1259             dev->ctl(dev, GET_MTUS, &mtutab) < 0 ||
1260             dev->ctl(dev, GET_TID_RANGE, &tid_range) < 0 ||
1261             dev->ctl(dev, GET_STID_RANGE, &stid_range) < 0)
1262                 goto out_free;
1263
1264         err = -ENOMEM;
1265         l2td = t3_init_l2t(l2t_capacity);
1266         if (!l2td)
1267                 goto out_free;
1268
1269         natids = min(tid_range.num / 2, MAX_ATIDS);
1270         err = init_tid_tabs(&t->tid_maps, tid_range.num, natids,
1271                             stid_range.num, ATID_BASE, stid_range.base);
1272         if (err)
1273                 goto out_free_l2t;
1274
1275         t->mtus = mtutab.mtus;
1276         t->nmtus = mtutab.size;
1277
1278         INIT_WORK(&t->tid_release_task, t3_process_tid_release_list);
1279         spin_lock_init(&t->tid_release_lock);
1280         INIT_LIST_HEAD(&t->list_node);
1281         t->dev = dev;
1282
1283         RCU_INIT_POINTER(dev->l2opt, l2td);
1284         T3C_DATA(dev) = t;
1285         dev->recv = process_rx;
1286         dev->neigh_update = t3_l2t_update;
1287
1288         /* Register netevent handler once */
1289         if (list_empty(&adapter_list))
1290                 register_netevent_notifier(&nb);
1291
1292         t->nofail_skb = alloc_skb(sizeof(struct cpl_tid_release), GFP_KERNEL);
1293         t->release_list_incomplete = 0;
1294
1295         add_adapter(adapter);
1296         return 0;
1297
1298 out_free_l2t:
1299         t3_free_l2t(l2td);
1300 out_free:
1301         kfree(t);
1302         return err;
1303 }
1304
1305 static void clean_l2_data(struct rcu_head *head)
1306 {
1307         struct l2t_data *d = container_of(head, struct l2t_data, rcu_head);
1308         t3_free_l2t(d);
1309 }
1310
1311
1312 void cxgb3_offload_deactivate(struct adapter *adapter)
1313 {
1314         struct t3cdev *tdev = &adapter->tdev;
1315         struct t3c_data *t = T3C_DATA(tdev);
1316         struct l2t_data *d;
1317
1318         remove_adapter(adapter);
1319         if (list_empty(&adapter_list))
1320                 unregister_netevent_notifier(&nb);
1321
1322         free_tid_maps(&t->tid_maps);
1323         T3C_DATA(tdev) = NULL;
1324         rcu_read_lock();
1325         d = L2DATA(tdev);
1326         rcu_read_unlock();
1327         RCU_INIT_POINTER(tdev->l2opt, NULL);
1328         call_rcu(&d->rcu_head, clean_l2_data);
1329         if (t->nofail_skb)
1330                 kfree_skb(t->nofail_skb);
1331         kfree(t);
1332 }
1333
1334 static inline void register_tdev(struct t3cdev *tdev)
1335 {
1336         static int unit;
1337
1338         mutex_lock(&cxgb3_db_lock);
1339         snprintf(tdev->name, sizeof(tdev->name), "ofld_dev%d", unit++);
1340         list_add_tail(&tdev->ofld_dev_list, &ofld_dev_list);
1341         mutex_unlock(&cxgb3_db_lock);
1342 }
1343
1344 static inline void unregister_tdev(struct t3cdev *tdev)
1345 {
1346         mutex_lock(&cxgb3_db_lock);
1347         list_del(&tdev->ofld_dev_list);
1348         mutex_unlock(&cxgb3_db_lock);
1349 }
1350
1351 static inline int adap2type(struct adapter *adapter)
1352 {
1353         int type = 0;
1354
1355         switch (adapter->params.rev) {
1356         case T3_REV_A:
1357                 type = T3A;
1358                 break;
1359         case T3_REV_B:
1360         case T3_REV_B2:
1361                 type = T3B;
1362                 break;
1363         case T3_REV_C:
1364                 type = T3C;
1365                 break;
1366         }
1367         return type;
1368 }
1369
1370 void cxgb3_adapter_ofld(struct adapter *adapter)
1371 {
1372         struct t3cdev *tdev = &adapter->tdev;
1373
1374         INIT_LIST_HEAD(&tdev->ofld_dev_list);
1375
1376         cxgb3_set_dummy_ops(tdev);
1377         tdev->send = t3_offload_tx;
1378         tdev->ctl = cxgb_offload_ctl;
1379         tdev->type = adap2type(adapter);
1380
1381         register_tdev(tdev);
1382 }
1383
1384 void cxgb3_adapter_unofld(struct adapter *adapter)
1385 {
1386         struct t3cdev *tdev = &adapter->tdev;
1387
1388         tdev->recv = NULL;
1389         tdev->neigh_update = NULL;
1390
1391         unregister_tdev(tdev);
1392 }
1393
1394 void __init cxgb3_offload_init(void)
1395 {
1396         int i;
1397
1398         for (i = 0; i < NUM_CPL_CMDS; ++i)
1399                 cpl_handlers[i] = do_bad_cpl;
1400
1401         t3_register_cpl_handler(CPL_SMT_WRITE_RPL, do_smt_write_rpl);
1402         t3_register_cpl_handler(CPL_L2T_WRITE_RPL, do_l2t_write_rpl);
1403         t3_register_cpl_handler(CPL_RTE_WRITE_RPL, do_rte_write_rpl);
1404         t3_register_cpl_handler(CPL_PASS_OPEN_RPL, do_stid_rpl);
1405         t3_register_cpl_handler(CPL_CLOSE_LISTSRV_RPL, do_stid_rpl);
1406         t3_register_cpl_handler(CPL_PASS_ACCEPT_REQ, do_cr);
1407         t3_register_cpl_handler(CPL_PASS_ESTABLISH, do_hwtid_rpl);
1408         t3_register_cpl_handler(CPL_ABORT_RPL_RSS, do_hwtid_rpl);
1409         t3_register_cpl_handler(CPL_ABORT_RPL, do_hwtid_rpl);
1410         t3_register_cpl_handler(CPL_RX_URG_NOTIFY, do_hwtid_rpl);
1411         t3_register_cpl_handler(CPL_RX_DATA, do_hwtid_rpl);
1412         t3_register_cpl_handler(CPL_TX_DATA_ACK, do_hwtid_rpl);
1413         t3_register_cpl_handler(CPL_TX_DMA_ACK, do_hwtid_rpl);
1414         t3_register_cpl_handler(CPL_ACT_OPEN_RPL, do_act_open_rpl);
1415         t3_register_cpl_handler(CPL_PEER_CLOSE, do_hwtid_rpl);
1416         t3_register_cpl_handler(CPL_CLOSE_CON_RPL, do_hwtid_rpl);
1417         t3_register_cpl_handler(CPL_ABORT_REQ_RSS, do_abort_req_rss);
1418         t3_register_cpl_handler(CPL_ACT_ESTABLISH, do_act_establish);
1419         t3_register_cpl_handler(CPL_SET_TCB_RPL, do_hwtid_rpl);
1420         t3_register_cpl_handler(CPL_GET_TCB_RPL, do_hwtid_rpl);
1421         t3_register_cpl_handler(CPL_RDMA_TERMINATE, do_term);
1422         t3_register_cpl_handler(CPL_RDMA_EC_STATUS, do_hwtid_rpl);
1423         t3_register_cpl_handler(CPL_TRACE_PKT, do_trace);
1424         t3_register_cpl_handler(CPL_RX_DATA_DDP, do_hwtid_rpl);
1425         t3_register_cpl_handler(CPL_RX_DDP_COMPLETE, do_hwtid_rpl);
1426         t3_register_cpl_handler(CPL_ISCSI_HDR, do_hwtid_rpl);
1427 }