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