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 <linux/slab.h>
  35 #include <net/neighbour.h>
  36 #include <linux/notifier.h>
  37 #include <asm/atomic.h>
  38 #include <linux/proc_fs.h>
  39 #include <linux/if_vlan.h>
  40 #include <net/netevent.h>
  41 #include <linux/highmem.h>
  42 #include <linux/vmalloc.h>
  43
  44 #include "common.h"
  45 #include "regs.h"
  46 #include "cxgb3_ioctl.h"
  47 #include "cxgb3_ctl_defs.h"
  48 #include "cxgb3_defs.h"
  49 #include "l2t.h"
  50 #include "firmware_exports.h"
  51 #include "cxgb3_offload.h"
  52
  53 static LIST_HEAD(client_list);
  54 static LIST_HEAD(ofld_dev_list);
  55 static DEFINE_MUTEX(cxgb3_db_lock);
  56
  57 static DEFINE_RWLOCK(adapter_list_lock);
  58 static LIST_HEAD(adapter_list);
  59
  60 static const unsigned int MAX_ATIDS = 64 * 1024;
  61 static const unsigned int ATID_BASE = 0x10000;
  62
  63 static void cxgb_neigh_update(struct neighbour *neigh);
  64 static void cxgb_redirect(struct dst_entry *old, struct dst_entry *new);
  65
  66 static inline int offload_activated(struct t3cdev *tdev)
  67 {
  68         const struct adapter *adapter = tdev2adap(tdev);
  69
  70         return test_bit(OFFLOAD_DEVMAP_BIT, &adapter->open_device_map);
  71 }
  72
  73 /**
  74  *      cxgb3_register_client - register an offload client
  75  *      @client: the client
  76  *
  77  *      Add the client to the client list,
  78  *      and call backs the client for each activated offload device
  79  */
  80 void cxgb3_register_client(struct cxgb3_client *client)
  81 {
  82         struct t3cdev *tdev;
  83
  84         mutex_lock(&cxgb3_db_lock);
  85         list_add_tail(&client->client_list, &client_list);
  86
  87         if (client->add) {
  88                 list_for_each_entry(tdev, &ofld_dev_list, ofld_dev_list) {
  89                         if (offload_activated(tdev))
  90                                 client->add(tdev);
  91                 }
  92         }
  93         mutex_unlock(&cxgb3_db_lock);
  94 }
  95
  96 EXPORT_SYMBOL(cxgb3_register_client);
  97
  98 /**
  99  *      cxgb3_unregister_client - unregister an offload client
 100  *      @client: the client
 101  *
 102  *      Remove the client to the client list,
 103  *      and call backs the client for each activated offload device.
 104  */
 105 void cxgb3_unregister_client(struct cxgb3_client *client)
 106 {
 107         struct t3cdev *tdev;
 108
 109         mutex_lock(&cxgb3_db_lock);
 110         list_del(&client->client_list);
 111
 112         if (client->remove) {
 113                 list_for_each_entry(tdev, &ofld_dev_list, ofld_dev_list) {
 114                         if (offload_activated(tdev))
 115                                 client->remove(tdev);
 116                 }
 117         }
 118         mutex_unlock(&cxgb3_db_lock);
 119 }
 120
 121 EXPORT_SYMBOL(cxgb3_unregister_client);
 122
 123 /**
 124  *      cxgb3_add_clients - activate registered clients for an offload device
 125  *      @tdev: the offload device
 126  *
 127  *      Call backs all registered clients once a offload device is activated
 128  */
 129 void cxgb3_add_clients(struct t3cdev *tdev)
 130 {
 131         struct cxgb3_client *client;
 132
 133         mutex_lock(&cxgb3_db_lock);
 134         list_for_each_entry(client, &client_list, client_list) {
 135                 if (client->add)
 136                         client->add(tdev);
 137         }
 138         mutex_unlock(&cxgb3_db_lock);
 139 }
 140
 141 /**
 142  *      cxgb3_remove_clients - deactivates registered clients
 143  *                             for an offload device
 144  *      @tdev: the offload device
 145  *
 146  *      Call backs all registered clients once a offload device is deactivated
 147  */
 148 void cxgb3_remove_clients(struct t3cdev *tdev)
 149 {
 150         struct cxgb3_client *client;
 151
 152         mutex_lock(&cxgb3_db_lock);
 153         list_for_each_entry(client, &client_list, client_list) {
 154                 if (client->remove)
 155                         client->remove(tdev);
 156         }
 157         mutex_unlock(&cxgb3_db_lock);
 158 }
 159
 160 void cxgb3_event_notify(struct t3cdev *tdev, u32 event, u32 port)
 161 {
 162         struct cxgb3_client *client;
 163
 164         mutex_lock(&cxgb3_db_lock);
 165         list_for_each_entry(client, &client_list, client_list) {
 166                 if (client->event_handler)
 167                         client->event_handler(tdev, event, port);
 168         }
 169         mutex_unlock(&cxgb3_db_lock);
 170 }
 171
 172 static struct net_device *get_iff_from_mac(struct adapter *adapter,
 173                                            const unsigned char *mac,
 174                                            unsigned int vlan)
 175 {
 176         int i;
 177
 178         for_each_port(adapter, i) {
 179                 struct vlan_group *grp;
 180                 struct net_device *dev = adapter->port[i];
 181                 const struct port_info *p = netdev_priv(dev);
 182
 183                 if (!memcmp(dev->dev_addr, mac, ETH_ALEN)) {
 184                         if (vlan && vlan != VLAN_VID_MASK) {
 185                                 grp = p->vlan_grp;
 186                                 dev = NULL;
 187                                 if (grp)
 188                                         dev = vlan_group_get_device(grp, vlan);
 189                         } else
 190                                 while (dev->master)
 191                                         dev = dev->master;
 192                         return dev;
 193                 }
 194         }
 195         return NULL;
 196 }
 197
 198 static int cxgb_ulp_iscsi_ctl(struct adapter *adapter, unsigned int req,
 199                               void *data)
 200 {
 201         int i;
 202         int ret = 0;
 203         unsigned int val = 0;
 204         struct ulp_iscsi_info *uiip = data;
 205
 206         switch (req) {
 207         case ULP_ISCSI_GET_PARAMS:
 208                 uiip->pdev = adapter->pdev;
 209                 uiip->llimit = t3_read_reg(adapter, A_ULPRX_ISCSI_LLIMIT);
 210                 uiip->ulimit = t3_read_reg(adapter, A_ULPRX_ISCSI_ULIMIT);
 211                 uiip->tagmask = t3_read_reg(adapter, A_ULPRX_ISCSI_TAGMASK);
 212
 213                 val = t3_read_reg(adapter, A_ULPRX_ISCSI_PSZ);
 214                 for (i = 0; i < 4; i++, val >>= 8)
 215                         uiip->pgsz_factor[i] = val & 0xFF;
 216
 217                 val = t3_read_reg(adapter, A_TP_PARA_REG7);
 218                 uiip->max_txsz =
 219                 uiip->max_rxsz = min((val >> S_PMMAXXFERLEN0)&M_PMMAXXFERLEN0,
 220                                      (val >> S_PMMAXXFERLEN1)&M_PMMAXXFERLEN1);
 221                 /*
 222                  * On tx, the iscsi pdu has to be <= tx page size and has to
 223                  * fit into the Tx PM FIFO.
 224                  */
 225                 val = min(adapter->params.tp.tx_pg_size,
 226                           t3_read_reg(adapter, A_PM1_TX_CFG) >> 17);
 227                 uiip->max_txsz = min(val, uiip->max_txsz);
 228
 229                 /* set MaxRxData to 16224 */
 230                 val = t3_read_reg(adapter, A_TP_PARA_REG2);
 231                 if ((val >> S_MAXRXDATA) != 0x3f60) {
 232                         val &= (M_RXCOALESCESIZE << S_RXCOALESCESIZE);
 233                         val |= V_MAXRXDATA(0x3f60);
 234                         printk(KERN_INFO
 235                                 "%s, iscsi set MaxRxData to 16224 (0x%x).\n",
 236                                 adapter->name, val);
 237                         t3_write_reg(adapter, A_TP_PARA_REG2, val);
 238                 }
 239
 240                 /*
 241                  * on rx, the iscsi pdu has to be < rx page size and the
 242                  * the max rx data length programmed in TP
 243                  */
 244                 val = min(adapter->params.tp.rx_pg_size,
 245                           ((t3_read_reg(adapter, A_TP_PARA_REG2)) >>
 246                                 S_MAXRXDATA) & M_MAXRXDATA);
 247                 uiip->max_rxsz = min(val, uiip->max_rxsz);
 248                 break;
 249         case ULP_ISCSI_SET_PARAMS:
 250                 t3_write_reg(adapter, A_ULPRX_ISCSI_TAGMASK, uiip->tagmask);
 251                 /* program the ddp page sizes */
 252                 for (i = 0; i < 4; i++)
 253                         val |= (uiip->pgsz_factor[i] & 0xF) << (8 * i);
 254                 if (val && (val != t3_read_reg(adapter, A_ULPRX_ISCSI_PSZ))) {
 255                         printk(KERN_INFO
 256                                 "%s, setting iscsi pgsz 0x%x, %u,%u,%u,%u.\n",
 257                                 adapter->name, val, uiip->pgsz_factor[0],
 258                                 uiip->pgsz_factor[1], uiip->pgsz_factor[2],
 259                                 uiip->pgsz_factor[3]);
 260                         t3_write_reg(adapter, A_ULPRX_ISCSI_PSZ, val);
 261                 }
 262                 break;
 263         default:
 264                 ret = -EOPNOTSUPP;
 265         }
 266         return ret;
 267 }
 268
 269 /* Response queue used for RDMA events. */
 270 #define ASYNC_NOTIF_RSPQ 0
 271
 272 static int cxgb_rdma_ctl(struct adapter *adapter, unsigned int req, void *data)
 273 {
 274         int ret = 0;
 275
 276         switch (req) {
 277         case RDMA_GET_PARAMS: {
 278                 struct rdma_info *rdma = data;
 279                 struct pci_dev *pdev = adapter->pdev;
 280
 281                 rdma->udbell_physbase = pci_resource_start(pdev, 2);
 282                 rdma->udbell_len = pci_resource_len(pdev, 2);
 283                 rdma->tpt_base =
 284                         t3_read_reg(adapter, A_ULPTX_TPT_LLIMIT);
 285                 rdma->tpt_top = t3_read_reg(adapter, A_ULPTX_TPT_ULIMIT);
 286                 rdma->pbl_base =
 287                         t3_read_reg(adapter, A_ULPTX_PBL_LLIMIT);
 288                 rdma->pbl_top = t3_read_reg(adapter, A_ULPTX_PBL_ULIMIT);
 289                 rdma->rqt_base = t3_read_reg(adapter, A_ULPRX_RQ_LLIMIT);
 290                 rdma->rqt_top = t3_read_reg(adapter, A_ULPRX_RQ_ULIMIT);
 291                 rdma->kdb_addr = adapter->regs + A_SG_KDOORBELL;
 292                 rdma->pdev = pdev;
 293                 break;
 294         }
 295         case RDMA_CQ_OP:{
 296                 unsigned long flags;
 297                 struct rdma_cq_op *rdma = data;
 298
 299                 /* may be called in any context */
 300                 spin_lock_irqsave(&adapter->sge.reg_lock, flags);
 301                 ret = t3_sge_cqcntxt_op(adapter, rdma->id, rdma->op,
 302                                         rdma->credits);
 303                 spin_unlock_irqrestore(&adapter->sge.reg_lock, flags);
 304                 break;
 305         }
 306         case RDMA_GET_MEM:{
 307                 struct ch_mem_range *t = data;
 308                 struct mc7 *mem;
 309
 310                 if ((t->addr & 7) || (t->len & 7))
 311                         return -EINVAL;
 312                 if (t->mem_id == MEM_CM)
 313                         mem = &adapter->cm;
 314                 else if (t->mem_id == MEM_PMRX)
 315                         mem = &adapter->pmrx;
 316                 else if (t->mem_id == MEM_PMTX)
 317                         mem = &adapter->pmtx;
 318                 else
 319                         return -EINVAL;
 320
 321                 ret =
 322                         t3_mc7_bd_read(mem, t->addr / 8, t->len / 8,
 323                                         (u64 *) t->buf);
 324                 if (ret)
 325                         return ret;
 326                 break;
 327         }
 328         case RDMA_CQ_SETUP:{
 329                 struct rdma_cq_setup *rdma = data;
 330
 331                 spin_lock_irq(&adapter->sge.reg_lock);
 332                 ret =
 333                         t3_sge_init_cqcntxt(adapter, rdma->id,
 334                                         rdma->base_addr, rdma->size,
 335                                         ASYNC_NOTIF_RSPQ,
 336                                         rdma->ovfl_mode, rdma->credits,
 337                                         rdma->credit_thres);
 338                 spin_unlock_irq(&adapter->sge.reg_lock);
 339                 break;
 340         }
 341         case RDMA_CQ_DISABLE:
 342                 spin_lock_irq(&adapter->sge.reg_lock);
 343                 ret = t3_sge_disable_cqcntxt(adapter, *(unsigned int *)data);
 344                 spin_unlock_irq(&adapter->sge.reg_lock);
 345                 break;
 346         case RDMA_CTRL_QP_SETUP:{
 347                 struct rdma_ctrlqp_setup *rdma = data;
 348
 349                 spin_lock_irq(&adapter->sge.reg_lock);
 350                 ret = t3_sge_init_ecntxt(adapter, FW_RI_SGEEC_START, 0,
 351                                                 SGE_CNTXT_RDMA,
 352                                                 ASYNC_NOTIF_RSPQ,
 353                                                 rdma->base_addr, rdma->size,
 354                                                 FW_RI_TID_START, 1, 0);
 355                 spin_unlock_irq(&adapter->sge.reg_lock);
 356                 break;
 357         }
 358         case RDMA_GET_MIB: {
 359                 spin_lock(&adapter->stats_lock);
 360                 t3_tp_get_mib_stats(adapter, (struct tp_mib_stats *)data);
 361                 spin_unlock(&adapter->stats_lock);
 362                 break;
 363         }
 364         default:
 365                 ret = -EOPNOTSUPP;
 366         }
 367         return ret;
 368 }
 369
 370 static int cxgb_offload_ctl(struct t3cdev *tdev, unsigned int req, void *data)
 371 {
 372         struct adapter *adapter = tdev2adap(tdev);
 373         struct tid_range *tid;
 374         struct mtutab *mtup;
 375         struct iff_mac *iffmacp;
 376         struct ddp_params *ddpp;
 377         struct adap_ports *ports;
 378         struct ofld_page_info *rx_page_info;
 379         struct tp_params *tp = &adapter->params.tp;
 380         int i;
 381
 382         switch (req) {
 383         case GET_MAX_OUTSTANDING_WR:
 384                 *(unsigned int *)data = FW_WR_NUM;
 385                 break;
 386         case GET_WR_LEN:
 387                 *(unsigned int *)data = WR_FLITS;
 388                 break;
 389         case GET_TX_MAX_CHUNK:
 390                 *(unsigned int *)data = 1 << 20;        /* 1MB */
 391                 break;
 392         case GET_TID_RANGE:
 393                 tid = data;
 394                 tid->num = t3_mc5_size(&adapter->mc5) -
 395                     adapter->params.mc5.nroutes -
 396                     adapter->params.mc5.nfilters - adapter->params.mc5.nservers;
 397                 tid->base = 0;
 398                 break;
 399         case GET_STID_RANGE:
 400                 tid = data;
 401                 tid->num = adapter->params.mc5.nservers;
 402                 tid->base = t3_mc5_size(&adapter->mc5) - tid->num -
 403                     adapter->params.mc5.nfilters - adapter->params.mc5.nroutes;
 404                 break;
 405         case GET_L2T_CAPACITY:
 406                 *(unsigned int *)data = 2048;
 407                 break;
 408         case GET_MTUS:
 409                 mtup = data;
 410                 mtup->size = NMTUS;
 411                 mtup->mtus = adapter->params.mtus;
 412                 break;
 413         case GET_IFF_FROM_MAC:
 414                 iffmacp = data;
 415                 iffmacp->dev = get_iff_from_mac(adapter, iffmacp->mac_addr,
 416                                                 iffmacp->vlan_tag &
 417                                                 VLAN_VID_MASK);
 418                 break;
 419         case GET_DDP_PARAMS:
 420                 ddpp = data;
 421                 ddpp->llimit = t3_read_reg(adapter, A_ULPRX_TDDP_LLIMIT);
 422                 ddpp->ulimit = t3_read_reg(adapter, A_ULPRX_TDDP_ULIMIT);
 423                 ddpp->tag_mask = t3_read_reg(adapter, A_ULPRX_TDDP_TAGMASK);
 424                 break;
 425         case GET_PORTS:
 426                 ports = data;
 427                 ports->nports = adapter->params.nports;
 428                 for_each_port(adapter, i)
 429                         ports->lldevs[i] = adapter->port[i];
 430                 break;
 431         case ULP_ISCSI_GET_PARAMS:
 432         case ULP_ISCSI_SET_PARAMS:
 433                 if (!offload_running(adapter))
 434                         return -EAGAIN;
 435                 return cxgb_ulp_iscsi_ctl(adapter, req, data);
 436         case RDMA_GET_PARAMS:
 437         case RDMA_CQ_OP:
 438         case RDMA_CQ_SETUP:
 439         case RDMA_CQ_DISABLE:
 440         case RDMA_CTRL_QP_SETUP:
 441         case RDMA_GET_MEM:
 442         case RDMA_GET_MIB:
 443                 if (!offload_running(adapter))
 444                         return -EAGAIN;
 445                 return cxgb_rdma_ctl(adapter, req, data);
 446         case GET_RX_PAGE_INFO:
 447                 rx_page_info = data;
 448                 rx_page_info->page_size = tp->rx_pg_size;
 449                 rx_page_info->num = tp->rx_num_pgs;
 450                 break;
 451         case GET_ISCSI_IPV4ADDR: {
 452                 struct iscsi_ipv4addr *p = data;
 453                 struct port_info *pi = netdev_priv(p->dev);
 454                 p->ipv4addr = pi->iscsi_ipv4addr;
 455                 break;
 456         }
 457         case GET_EMBEDDED_INFO: {
 458                 struct ch_embedded_info *e = data;
 459
 460                 spin_lock(&adapter->stats_lock);
 461                 t3_get_fw_version(adapter, &e->fw_vers);
 462                 t3_get_tp_version(adapter, &e->tp_vers);
 463                 spin_unlock(&adapter->stats_lock);
 464                 break;
 465         }
 466         default:
 467                 return -EOPNOTSUPP;
 468         }
 469         return 0;
 470 }
 471
 472 /*
 473  * Dummy handler for Rx offload packets in case we get an offload packet before
 474  * proper processing is setup.  This complains and drops the packet as it isn't
 475  * normal to get offload packets at this stage.
 476  */
 477 static int rx_offload_blackhole(struct t3cdev *dev, struct sk_buff **skbs,
 478                                 int n)
 479 {
 480         while (n--)
 481                 dev_kfree_skb_any(skbs[n]);
 482         return 0;
 483 }
 484
 485 static void dummy_neigh_update(struct t3cdev *dev, struct neighbour *neigh)
 486 {
 487 }
 488
 489 void cxgb3_set_dummy_ops(struct t3cdev *dev)
 490 {
 491         dev->recv = rx_offload_blackhole;
 492         dev->neigh_update = dummy_neigh_update;
 493 }
 494
 495 /*
 496  * Free an active-open TID.
 497  */
 498 void *cxgb3_free_atid(struct t3cdev *tdev, int atid)
 499 {
 500         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 501         union active_open_entry *p = atid2entry(t, atid);
 502         void *ctx = p->t3c_tid.ctx;
 503
 504         spin_lock_bh(&t->atid_lock);
 505         p->next = t->afree;
 506         t->afree = p;
 507         t->atids_in_use--;
 508         spin_unlock_bh(&t->atid_lock);
 509
 510         return ctx;
 511 }
 512
 513 EXPORT_SYMBOL(cxgb3_free_atid);
 514
 515 /*
 516  * Free a server TID and return it to the free pool.
 517  */
 518 void cxgb3_free_stid(struct t3cdev *tdev, int stid)
 519 {
 520         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 521         union listen_entry *p = stid2entry(t, stid);
 522
 523         spin_lock_bh(&t->stid_lock);
 524         p->next = t->sfree;
 525         t->sfree = p;
 526         t->stids_in_use--;
 527         spin_unlock_bh(&t->stid_lock);
 528 }
 529
 530 EXPORT_SYMBOL(cxgb3_free_stid);
 531
 532 void cxgb3_insert_tid(struct t3cdev *tdev, struct cxgb3_client *client,
 533                       void *ctx, unsigned int tid)
 534 {
 535         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 536
 537         t->tid_tab[tid].client = client;
 538         t->tid_tab[tid].ctx = ctx;
 539         atomic_inc(&t->tids_in_use);
 540 }
 541
 542 EXPORT_SYMBOL(cxgb3_insert_tid);
 543
 544 /*
 545  * Populate a TID_RELEASE WR.  The skb must be already propely sized.
 546  */
 547 static inline void mk_tid_release(struct sk_buff *skb, unsigned int tid)
 548 {
 549         struct cpl_tid_release *req;
 550
 551         skb->priority = CPL_PRIORITY_SETUP;
 552         req = (struct cpl_tid_release *)__skb_put(skb, sizeof(*req));
 553         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 554         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_TID_RELEASE, tid));
 555 }
 556
 557 static void t3_process_tid_release_list(struct work_struct *work)
 558 {
 559         struct t3c_data *td = container_of(work, struct t3c_data,
 560                                            tid_release_task);
 561         struct sk_buff *skb;
 562         struct t3cdev *tdev = td->dev;
 563
 564
 565         spin_lock_bh(&td->tid_release_lock);
 566         while (td->tid_release_list) {
 567                 struct t3c_tid_entry *p = td->tid_release_list;
 568
 569                 td->tid_release_list = (struct t3c_tid_entry *)p->ctx;
 570                 spin_unlock_bh(&td->tid_release_lock);
 571
 572                 skb = alloc_skb(sizeof(struct cpl_tid_release),
 573                                 GFP_KERNEL);
 574                 if (!skb)
 575                         skb = td->nofail_skb;
 576                 if (!skb) {
 577                         spin_lock_bh(&td->tid_release_lock);
 578                         p->ctx = (void *)td->tid_release_list;
 579                         td->tid_release_list = (struct t3c_tid_entry *)p;
 580                         break;
 581                 }
 582                 mk_tid_release(skb, p - td->tid_maps.tid_tab);
 583                 cxgb3_ofld_send(tdev, skb);
 584                 p->ctx = NULL;
 585                 if (skb == td->nofail_skb)
 586                         td->nofail_skb =
 587                                 alloc_skb(sizeof(struct cpl_tid_release),
 588                                         GFP_KERNEL);
 589                 spin_lock_bh(&td->tid_release_lock);
 590         }
 591         td->release_list_incomplete = (td->tid_release_list == NULL) ? 0 : 1;
 592         spin_unlock_bh(&td->tid_release_lock);
 593
 594         if (!td->nofail_skb)
 595                 td->nofail_skb =
 596                         alloc_skb(sizeof(struct cpl_tid_release),
 597                                 GFP_KERNEL);
 598 }
 599
 600 /* use ctx as a next pointer in the tid release list */
 601 void cxgb3_queue_tid_release(struct t3cdev *tdev, unsigned int tid)
 602 {
 603         struct t3c_data *td = T3C_DATA(tdev);
 604         struct t3c_tid_entry *p = &td->tid_maps.tid_tab[tid];
 605
 606         spin_lock_bh(&td->tid_release_lock);
 607         p->ctx = (void *)td->tid_release_list;
 608         p->client = NULL;
 609         td->tid_release_list = p;
 610         if (!p->ctx || td->release_list_incomplete)
 611                 schedule_work(&td->tid_release_task);
 612         spin_unlock_bh(&td->tid_release_lock);
 613 }
 614
 615 EXPORT_SYMBOL(cxgb3_queue_tid_release);
 616
 617 /*
 618  * Remove a tid from the TID table.  A client may defer processing its last
 619  * CPL message if it is locked at the time it arrives, and while the message
 620  * sits in the client's backlog the TID may be reused for another connection.
 621  * To handle this we atomically switch the TID association if it still points
 622  * to the original client context.
 623  */
 624 void cxgb3_remove_tid(struct t3cdev *tdev, void *ctx, unsigned int tid)
 625 {
 626         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 627
 628         BUG_ON(tid >= t->ntids);
 629         if (tdev->type == T3A)
 630                 (void)cmpxchg(&t->tid_tab[tid].ctx, ctx, NULL);
 631         else {
 632                 struct sk_buff *skb;
 633
 634                 skb = alloc_skb(sizeof(struct cpl_tid_release), GFP_ATOMIC);
 635                 if (likely(skb)) {
 636                         mk_tid_release(skb, tid);
 637                         cxgb3_ofld_send(tdev, skb);
 638                         t->tid_tab[tid].ctx = NULL;
 639                 } else
 640                         cxgb3_queue_tid_release(tdev, tid);
 641         }
 642         atomic_dec(&t->tids_in_use);
 643 }
 644
 645 EXPORT_SYMBOL(cxgb3_remove_tid);
 646
 647 int cxgb3_alloc_atid(struct t3cdev *tdev, struct cxgb3_client *client,
 648                      void *ctx)
 649 {
 650         int atid = -1;
 651         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 652
 653         spin_lock_bh(&t->atid_lock);
 654         if (t->afree &&
 655             t->atids_in_use + atomic_read(&t->tids_in_use) + MC5_MIN_TIDS <=
 656             t->ntids) {
 657                 union active_open_entry *p = t->afree;
 658
 659                 atid = (p - t->atid_tab) + t->atid_base;
 660                 t->afree = p->next;
 661                 p->t3c_tid.ctx = ctx;
 662                 p->t3c_tid.client = client;
 663                 t->atids_in_use++;
 664         }
 665         spin_unlock_bh(&t->atid_lock);
 666         return atid;
 667 }
 668
 669 EXPORT_SYMBOL(cxgb3_alloc_atid);
 670
 671 int cxgb3_alloc_stid(struct t3cdev *tdev, struct cxgb3_client *client,
 672                      void *ctx)
 673 {
 674         int stid = -1;
 675         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 676
 677         spin_lock_bh(&t->stid_lock);
 678         if (t->sfree) {
 679                 union listen_entry *p = t->sfree;
 680
 681                 stid = (p - t->stid_tab) + t->stid_base;
 682                 t->sfree = p->next;
 683                 p->t3c_tid.ctx = ctx;
 684                 p->t3c_tid.client = client;
 685                 t->stids_in_use++;
 686         }
 687         spin_unlock_bh(&t->stid_lock);
 688         return stid;
 689 }
 690
 691 EXPORT_SYMBOL(cxgb3_alloc_stid);
 692
 693 /* Get the t3cdev associated with a net_device */
 694 struct t3cdev *dev2t3cdev(struct net_device *dev)
 695 {
 696         const struct port_info *pi = netdev_priv(dev);
 697
 698         return (struct t3cdev *)pi->adapter;
 699 }
 700
 701 EXPORT_SYMBOL(dev2t3cdev);
 702
 703 static int do_smt_write_rpl(struct t3cdev *dev, struct sk_buff *skb)
 704 {
 705         struct cpl_smt_write_rpl *rpl = cplhdr(skb);
 706
 707         if (rpl->status != CPL_ERR_NONE)
 708                 printk(KERN_ERR
 709                        "Unexpected SMT_WRITE_RPL status %u for entry %u\n",
 710                        rpl->status, GET_TID(rpl));
 711
 712         return CPL_RET_BUF_DONE;
 713 }
 714
 715 static int do_l2t_write_rpl(struct t3cdev *dev, struct sk_buff *skb)
 716 {
 717         struct cpl_l2t_write_rpl *rpl = cplhdr(skb);
 718
 719         if (rpl->status != CPL_ERR_NONE)
 720                 printk(KERN_ERR
 721                        "Unexpected L2T_WRITE_RPL status %u for entry %u\n",
 722                        rpl->status, GET_TID(rpl));
 723
 724         return CPL_RET_BUF_DONE;
 725 }
 726
 727 static int do_rte_write_rpl(struct t3cdev *dev, struct sk_buff *skb)
 728 {
 729         struct cpl_rte_write_rpl *rpl = cplhdr(skb);
 730
 731         if (rpl->status != CPL_ERR_NONE)
 732                 printk(KERN_ERR
 733                        "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                 printk(KERN_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                 printk(KERN_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                 printk(KERN_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                 printk(KERN_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                 printk(KERN_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                 printk(KERN_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_PMTU_UPDATE):
 971                 break;
 972         case (NETEVENT_REDIRECT):{
 973                 struct netevent_redirect *nr = ctx;
 974                 cxgb_redirect(nr->old, nr->new);
 975                 cxgb_neigh_update(nr->new->neighbour);
 976                 break;
 977         }
 978         default:
 979                 break;
 980         }
 981         return 0;
 982 }
 983
 984 static struct notifier_block nb = {
 985         .notifier_call = nb_callback
 986 };
 987
 988 /*
 989  * Process a received packet with an unknown/unexpected CPL opcode.
 990  */
 991 static int do_bad_cpl(struct t3cdev *dev, struct sk_buff *skb)
 992 {
 993         printk(KERN_ERR "%s: received bad CPL command 0x%x\n", dev->name,
 994                *skb->data);
 995         return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 996 }
 997
 998 /*
 999  * Handlers for each CPL opcode
1000  */
1001 static cpl_handler_func cpl_handlers[NUM_CPL_CMDS];
1002
1003 /*
1004  * Add a new handler to the CPL dispatch table.  A NULL handler may be supplied
1005  * to unregister an existing handler.
1006  */
1007 void t3_register_cpl_handler(unsigned int opcode, cpl_handler_func h)
1008 {
1009         if (opcode < NUM_CPL_CMDS)
1010                 cpl_handlers[opcode] = h ? h : do_bad_cpl;
1011         else
1012                 printk(KERN_ERR "T3C: handler registration for "
1013                        "opcode %x failed\n", opcode);
1014 }
1015
1016 EXPORT_SYMBOL(t3_register_cpl_handler);
1017
1018 /*
1019  * T3CDEV's receive method.
1020  */
1021 static int process_rx(struct t3cdev *dev, struct sk_buff **skbs, int n)
1022 {
1023         while (n--) {
1024                 struct sk_buff *skb = *skbs++;
1025                 unsigned int opcode = get_opcode(skb);
1026                 int ret = cpl_handlers[opcode] (dev, skb);
1027
1028 #if VALIDATE_TID
1029                 if (ret & CPL_RET_UNKNOWN_TID) {
1030                         union opcode_tid *p = cplhdr(skb);
1031
1032                         printk(KERN_ERR "%s: CPL message (opcode %u) had "
1033                                "unknown TID %u\n", dev->name, opcode,
1034                                G_TID(ntohl(p->opcode_tid)));
1035                 }
1036 #endif
1037                 if (ret & CPL_RET_BUF_DONE)
1038                         kfree_skb(skb);
1039         }
1040         return 0;
1041 }
1042
1043 /*
1044  * Sends an sk_buff to a T3C driver after dealing with any active network taps.
1045  */
1046 int cxgb3_ofld_send(struct t3cdev *dev, struct sk_buff *skb)
1047 {
1048         int r;
1049
1050         local_bh_disable();
1051         r = dev->send(dev, skb);
1052         local_bh_enable();
1053         return r;
1054 }
1055
1056 EXPORT_SYMBOL(cxgb3_ofld_send);
1057
1058 static int is_offloading(struct net_device *dev)
1059 {
1060         struct adapter *adapter;
1061         int i;
1062
1063         read_lock_bh(&adapter_list_lock);
1064         list_for_each_entry(adapter, &adapter_list, adapter_list) {
1065                 for_each_port(adapter, i) {
1066                         if (dev == adapter->port[i]) {
1067                                 read_unlock_bh(&adapter_list_lock);
1068                                 return 1;
1069                         }
1070                 }
1071         }
1072         read_unlock_bh(&adapter_list_lock);
1073         return 0;
1074 }
1075
1076 static void cxgb_neigh_update(struct neighbour *neigh)
1077 {
1078         struct net_device *dev = neigh->dev;
1079
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                 printk(KERN_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 {
1112         struct net_device *olddev, *newdev;
1113         struct tid_info *ti;
1114         struct t3cdev *tdev;
1115         u32 tid;
1116         int update_tcb;
1117         struct l2t_entry *e;
1118         struct t3c_tid_entry *te;
1119
1120         olddev = old->neighbour->dev;
1121         newdev = new->neighbour->dev;
1122         if (!is_offloading(olddev))
1123                 return;
1124         if (!is_offloading(newdev)) {
1125                 printk(KERN_WARNING "%s: Redirect to non-offload "
1126                        "device ignored.\n", __func__);
1127                 return;
1128         }
1129         tdev = dev2t3cdev(olddev);
1130         BUG_ON(!tdev);
1131         if (tdev != dev2t3cdev(newdev)) {
1132                 printk(KERN_WARNING "%s: Redirect to different "
1133                        "offload device ignored.\n", __func__);
1134                 return;
1135         }
1136
1137         /* Add new L2T entry */
1138         e = t3_l2t_get(tdev, new->neighbour, newdev);
1139         if (!e) {
1140                 printk(KERN_ERR "%s: couldn't allocate new l2t entry!\n",
1141                        __func__);
1142                 return;
1143         }
1144
1145         /* Walk tid table and notify clients of dst change. */
1146         ti = &(T3C_DATA(tdev))->tid_maps;
1147         for (tid = 0; tid < ti->ntids; tid++) {
1148                 te = lookup_tid(ti, tid);
1149                 BUG_ON(!te);
1150                 if (te && te->ctx && te->client && te->client->redirect) {
1151                         update_tcb = te->client->redirect(te->ctx, old, new, e);
1152                         if (update_tcb) {
1153                                 l2t_hold(L2DATA(tdev), e);
1154                                 set_l2t_ix(tdev, tid, e);
1155                         }
1156                 }
1157         }
1158         l2t_release(L2DATA(tdev), e);
1159 }
1160
1161 /*
1162  * Allocate a chunk of memory using kmalloc or, if that fails, vmalloc.
1163  * The allocated memory is cleared.
1164  */
1165 void *cxgb_alloc_mem(unsigned long size)
1166 {
1167         void *p = kmalloc(size, GFP_KERNEL);
1168
1169         if (!p)
1170                 p = vmalloc(size);
1171         if (p)
1172                 memset(p, 0, size);
1173         return p;
1174 }
1175
1176 /*
1177  * Free memory allocated through t3_alloc_mem().
1178  */
1179 void cxgb_free_mem(void *addr)
1180 {
1181         if (is_vmalloc_addr(addr))
1182                 vfree(addr);
1183         else
1184                 kfree(addr);
1185 }
1186
1187 /*
1188  * Allocate and initialize the TID tables.  Returns 0 on success.
1189  */
1190 static int init_tid_tabs(struct tid_info *t, unsigned int ntids,
1191                          unsigned int natids, unsigned int nstids,
1192                          unsigned int atid_base, unsigned int stid_base)
1193 {
1194         unsigned long size = ntids * sizeof(*t->tid_tab) +
1195             natids * sizeof(*t->atid_tab) + nstids * sizeof(*t->stid_tab);
1196
1197         t->tid_tab = cxgb_alloc_mem(size);
1198         if (!t->tid_tab)
1199                 return -ENOMEM;
1200
1201         t->stid_tab = (union listen_entry *)&t->tid_tab[ntids];
1202         t->atid_tab = (union active_open_entry *)&t->stid_tab[nstids];
1203         t->ntids = ntids;
1204         t->nstids = nstids;
1205         t->stid_base = stid_base;
1206         t->sfree = NULL;
1207         t->natids = natids;
1208         t->atid_base = atid_base;
1209         t->afree = NULL;
1210         t->stids_in_use = t->atids_in_use = 0;
1211         atomic_set(&t->tids_in_use, 0);
1212         spin_lock_init(&t->stid_lock);
1213         spin_lock_init(&t->atid_lock);
1214
1215         /*
1216          * Setup the free lists for stid_tab and atid_tab.
1217          */
1218         if (nstids) {
1219                 while (--nstids)
1220                         t->stid_tab[nstids - 1].next = &t->stid_tab[nstids];
1221                 t->sfree = t->stid_tab;
1222         }
1223         if (natids) {
1224                 while (--natids)
1225                         t->atid_tab[natids - 1].next = &t->atid_tab[natids];
1226                 t->afree = t->atid_tab;
1227         }
1228         return 0;
1229 }
1230
1231 static void free_tid_maps(struct tid_info *t)
1232 {
1233         cxgb_free_mem(t->tid_tab);
1234 }
1235
1236 static inline void add_adapter(struct adapter *adap)
1237 {
1238         write_lock_bh(&adapter_list_lock);
1239         list_add_tail(&adap->adapter_list, &adapter_list);
1240         write_unlock_bh(&adapter_list_lock);
1241 }
1242
1243 static inline void remove_adapter(struct adapter *adap)
1244 {
1245         write_lock_bh(&adapter_list_lock);
1246         list_del(&adap->adapter_list);
1247         write_unlock_bh(&adapter_list_lock);
1248 }
1249
1250 int cxgb3_offload_activate(struct adapter *adapter)
1251 {
1252         struct t3cdev *dev = &adapter->tdev;
1253         int natids, err;
1254         struct t3c_data *t;
1255         struct tid_range stid_range, tid_range;
1256         struct mtutab mtutab;
1257         unsigned int l2t_capacity;
1258
1259         t = kzalloc(sizeof(*t), GFP_KERNEL);
1260         if (!t)
1261                 return -ENOMEM;
1262
1263         err = -EOPNOTSUPP;
1264         if (dev->ctl(dev, GET_TX_MAX_CHUNK, &t->tx_max_chunk) < 0 ||
1265             dev->ctl(dev, GET_MAX_OUTSTANDING_WR, &t->max_wrs) < 0 ||
1266             dev->ctl(dev, GET_L2T_CAPACITY, &l2t_capacity) < 0 ||
1267             dev->ctl(dev, GET_MTUS, &mtutab) < 0 ||
1268             dev->ctl(dev, GET_TID_RANGE, &tid_range) < 0 ||
1269             dev->ctl(dev, GET_STID_RANGE, &stid_range) < 0)
1270                 goto out_free;
1271
1272         err = -ENOMEM;
1273         L2DATA(dev) = t3_init_l2t(l2t_capacity);
1274         if (!L2DATA(dev))
1275                 goto out_free;
1276
1277         natids = min(tid_range.num / 2, MAX_ATIDS);
1278         err = init_tid_tabs(&t->tid_maps, tid_range.num, natids,
1279                             stid_range.num, ATID_BASE, stid_range.base);
1280         if (err)
1281                 goto out_free_l2t;
1282
1283         t->mtus = mtutab.mtus;
1284         t->nmtus = mtutab.size;
1285
1286         INIT_WORK(&t->tid_release_task, t3_process_tid_release_list);
1287         spin_lock_init(&t->tid_release_lock);
1288         INIT_LIST_HEAD(&t->list_node);
1289         t->dev = dev;
1290
1291         T3C_DATA(dev) = t;
1292         dev->recv = process_rx;
1293         dev->neigh_update = t3_l2t_update;
1294
1295         /* Register netevent handler once */
1296         if (list_empty(&adapter_list))
1297                 register_netevent_notifier(&nb);
1298
1299         t->nofail_skb = alloc_skb(sizeof(struct cpl_tid_release), GFP_KERNEL);
1300         t->release_list_incomplete = 0;
1301
1302         add_adapter(adapter);
1303         return 0;
1304
1305 out_free_l2t:
1306         t3_free_l2t(L2DATA(dev));
1307         L2DATA(dev) = NULL;
1308 out_free:
1309         kfree(t);
1310         return err;
1311 }
1312
1313 void cxgb3_offload_deactivate(struct adapter *adapter)
1314 {
1315         struct t3cdev *tdev = &adapter->tdev;
1316         struct t3c_data *t = T3C_DATA(tdev);
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         t3_free_l2t(L2DATA(tdev));
1325         L2DATA(tdev) = NULL;
1326         if (t->nofail_skb)
1327                 kfree_skb(t->nofail_skb);
1328         kfree(t);
1329 }
1330
1331 static inline void register_tdev(struct t3cdev *tdev)
1332 {
1333         static int unit;
1334
1335         mutex_lock(&cxgb3_db_lock);
1336         snprintf(tdev->name, sizeof(tdev->name), "ofld_dev%d", unit++);
1337         list_add_tail(&tdev->ofld_dev_list, &ofld_dev_list);
1338         mutex_unlock(&cxgb3_db_lock);
1339 }
1340
1341 static inline void unregister_tdev(struct t3cdev *tdev)
1342 {
1343         mutex_lock(&cxgb3_db_lock);
1344         list_del(&tdev->ofld_dev_list);
1345         mutex_unlock(&cxgb3_db_lock);
1346 }
1347
1348 static inline int adap2type(struct adapter *adapter)
1349 {
1350         int type = 0;
1351
1352         switch (adapter->params.rev) {
1353         case T3_REV_A:
1354                 type = T3A;
1355                 break;
1356         case T3_REV_B:
1357         case T3_REV_B2:
1358                 type = T3B;
1359                 break;
1360         case T3_REV_C:
1361                 type = T3C;
1362                 break;
1363         }
1364         return type;
1365 }
1366
1367 void __devinit cxgb3_adapter_ofld(struct adapter *adapter)
1368 {
1369         struct t3cdev *tdev = &adapter->tdev;
1370
1371         INIT_LIST_HEAD(&tdev->ofld_dev_list);
1372
1373         cxgb3_set_dummy_ops(tdev);
1374         tdev->send = t3_offload_tx;
1375         tdev->ctl = cxgb_offload_ctl;
1376         tdev->type = adap2type(adapter);
1377
1378         register_tdev(tdev);
1379 }
1380
1381 void __devexit cxgb3_adapter_unofld(struct adapter *adapter)
1382 {
1383         struct t3cdev *tdev = &adapter->tdev;
1384
1385         tdev->recv = NULL;
1386         tdev->neigh_update = NULL;
1387
1388         unregister_tdev(tdev);
1389 }
1390
1391 void __init cxgb3_offload_init(void)
1392 {
1393         int i;
1394
1395         for (i = 0; i < NUM_CPL_CMDS; ++i)
1396                 cpl_handlers[i] = do_bad_cpl;
1397
1398         t3_register_cpl_handler(CPL_SMT_WRITE_RPL, do_smt_write_rpl);
1399         t3_register_cpl_handler(CPL_L2T_WRITE_RPL, do_l2t_write_rpl);
1400         t3_register_cpl_handler(CPL_RTE_WRITE_RPL, do_rte_write_rpl);
1401         t3_register_cpl_handler(CPL_PASS_OPEN_RPL, do_stid_rpl);
1402         t3_register_cpl_handler(CPL_CLOSE_LISTSRV_RPL, do_stid_rpl);
1403         t3_register_cpl_handler(CPL_PASS_ACCEPT_REQ, do_cr);
1404         t3_register_cpl_handler(CPL_PASS_ESTABLISH, do_hwtid_rpl);
1405         t3_register_cpl_handler(CPL_ABORT_RPL_RSS, do_hwtid_rpl);
1406         t3_register_cpl_handler(CPL_ABORT_RPL, do_hwtid_rpl);
1407         t3_register_cpl_handler(CPL_RX_URG_NOTIFY, do_hwtid_rpl);
1408         t3_register_cpl_handler(CPL_RX_DATA, do_hwtid_rpl);
1409         t3_register_cpl_handler(CPL_TX_DATA_ACK, do_hwtid_rpl);
1410         t3_register_cpl_handler(CPL_TX_DMA_ACK, do_hwtid_rpl);
1411         t3_register_cpl_handler(CPL_ACT_OPEN_RPL, do_act_open_rpl);
1412         t3_register_cpl_handler(CPL_PEER_CLOSE, do_hwtid_rpl);
1413         t3_register_cpl_handler(CPL_CLOSE_CON_RPL, do_hwtid_rpl);
1414         t3_register_cpl_handler(CPL_ABORT_REQ_RSS, do_abort_req_rss);
1415         t3_register_cpl_handler(CPL_ACT_ESTABLISH, do_act_establish);
1416         t3_register_cpl_handler(CPL_SET_TCB_RPL, do_hwtid_rpl);
1417         t3_register_cpl_handler(CPL_GET_TCB_RPL, do_hwtid_rpl);
1418         t3_register_cpl_handler(CPL_RDMA_TERMINATE, do_term);
1419         t3_register_cpl_handler(CPL_RDMA_EC_STATUS, do_hwtid_rpl);
1420         t3_register_cpl_handler(CPL_TRACE_PKT, do_trace);
1421         t3_register_cpl_handler(CPL_RX_DATA_DDP, do_hwtid_rpl);
1422         t3_register_cpl_handler(CPL_RX_DDP_COMPLETE, do_hwtid_rpl);
1423         t3_register_cpl_handler(CPL_ISCSI_HDR, do_hwtid_rpl);
1424 }