drivers/scsi/fnic/fnic_fcs.c

   1 /*
   2  * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
   3  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   4  *
   5  * This program is free software; you may redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; version 2 of the License.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  10  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  11  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  12  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  13  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  14  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  15  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  16  * SOFTWARE.
  17  */
  18 #include <linux/errno.h>
  19 #include <linux/pci.h>
  20 #include <linux/skbuff.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/if_ether.h>
  24 #include <linux/if_vlan.h>
  25 #include <linux/workqueue.h>
  26 #include <scsi/fc/fc_fip.h>
  27 #include <scsi/fc/fc_els.h>
  28 #include <scsi/fc/fc_fcoe.h>
  29 #include <scsi/fc_frame.h>
  30 #include <scsi/libfc.h>
  31 #include "fnic_io.h"
  32 #include "fnic.h"
  33 #include "cq_enet_desc.h"
  34 #include "cq_exch_desc.h"
  35
  36 struct workqueue_struct *fnic_event_queue;
  37
  38 static void fnic_set_eth_mode(struct fnic *);
  39
  40 void fnic_handle_link(struct work_struct *work)
  41 {
  42         struct fnic *fnic = container_of(work, struct fnic, link_work);
  43         unsigned long flags;
  44         int old_link_status;
  45         u32 old_link_down_cnt;
  46
  47         spin_lock_irqsave(&fnic->fnic_lock, flags);
  48
  49         if (fnic->stop_rx_link_events) {
  50                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
  51                 return;
  52         }
  53
  54         old_link_down_cnt = fnic->link_down_cnt;
  55         old_link_status = fnic->link_status;
  56         fnic->link_status = vnic_dev_link_status(fnic->vdev);
  57         fnic->link_down_cnt = vnic_dev_link_down_cnt(fnic->vdev);
  58
  59         if (old_link_status == fnic->link_status) {
  60                 if (!fnic->link_status)
  61                         /* DOWN -> DOWN */
  62                         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
  63                 else {
  64                         if (old_link_down_cnt != fnic->link_down_cnt) {
  65                                 /* UP -> DOWN -> UP */
  66                                 fnic->lport->host_stats.link_failure_count++;
  67                                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
  68                                 FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
  69                                              "link down\n");
  70                                 fcoe_ctlr_link_down(&fnic->ctlr);
  71                                 FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
  72                                              "link up\n");
  73                                 fcoe_ctlr_link_up(&fnic->ctlr);
  74                         } else
  75                                 /* UP -> UP */
  76                                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
  77                 }
  78         } else if (fnic->link_status) {
  79                 /* DOWN -> UP */
  80                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
  81                 FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, "link up\n");
  82                 fcoe_ctlr_link_up(&fnic->ctlr);
  83         } else {
  84                 /* UP -> DOWN */
  85                 fnic->lport->host_stats.link_failure_count++;
  86                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
  87                 FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, "link down\n");
  88                 fcoe_ctlr_link_down(&fnic->ctlr);
  89         }
  90
  91 }
  92
  93 /*
  94  * This function passes incoming fabric frames to libFC
  95  */
  96 void fnic_handle_frame(struct work_struct *work)
  97 {
  98         struct fnic *fnic = container_of(work, struct fnic, frame_work);
  99         struct fc_lport *lp = fnic->lport;
 100         unsigned long flags;
 101         struct sk_buff *skb;
 102         struct fc_frame *fp;
 103
 104         while ((skb = skb_dequeue(&fnic->frame_queue))) {
 105
 106                 spin_lock_irqsave(&fnic->fnic_lock, flags);
 107                 if (fnic->stop_rx_link_events) {
 108                         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 109                         dev_kfree_skb(skb);
 110                         return;
 111                 }
 112                 fp = (struct fc_frame *)skb;
 113
 114                 /*
 115                  * If we're in a transitional state, just re-queue and return.
 116                  * The queue will be serviced when we get to a stable state.
 117                  */
 118                 if (fnic->state != FNIC_IN_FC_MODE &&
 119                     fnic->state != FNIC_IN_ETH_MODE) {
 120                         skb_queue_head(&fnic->frame_queue, skb);
 121                         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 122                         return;
 123                 }
 124                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 125
 126                 fc_exch_recv(lp, fp);
 127         }
 128 }
 129
 130 /**
 131  * fnic_import_rq_eth_pkt() - handle received FCoE or FIP frame.
 132  * @fnic:       fnic instance.
 133  * @skb:        Ethernet Frame.
 134  */
 135 static inline int fnic_import_rq_eth_pkt(struct fnic *fnic, struct sk_buff *skb)
 136 {
 137         struct fc_frame *fp;
 138         struct ethhdr *eh;
 139         struct fcoe_hdr *fcoe_hdr;
 140         struct fcoe_crc_eof *ft;
 141
 142         /*
 143          * Undo VLAN encapsulation if present.
 144          */
 145         eh = (struct ethhdr *)skb->data;
 146         if (eh->h_proto == htons(ETH_P_8021Q)) {
 147                 memmove((u8 *)eh + VLAN_HLEN, eh, ETH_ALEN * 2);
 148                 eh = (struct ethhdr *)skb_pull(skb, VLAN_HLEN);
 149                 skb_reset_mac_header(skb);
 150         }
 151         if (eh->h_proto == htons(ETH_P_FIP)) {
 152                 skb_pull(skb, sizeof(*eh));
 153                 fcoe_ctlr_recv(&fnic->ctlr, skb);
 154                 return 1;               /* let caller know packet was used */
 155         }
 156         if (eh->h_proto != htons(ETH_P_FCOE))
 157                 goto drop;
 158         skb_set_network_header(skb, sizeof(*eh));
 159         skb_pull(skb, sizeof(*eh));
 160
 161         fcoe_hdr = (struct fcoe_hdr *)skb->data;
 162         if (FC_FCOE_DECAPS_VER(fcoe_hdr) != FC_FCOE_VER)
 163                 goto drop;
 164
 165         fp = (struct fc_frame *)skb;
 166         fc_frame_init(fp);
 167         fr_sof(fp) = fcoe_hdr->fcoe_sof;
 168         skb_pull(skb, sizeof(struct fcoe_hdr));
 169         skb_reset_transport_header(skb);
 170
 171         ft = (struct fcoe_crc_eof *)(skb->data + skb->len - sizeof(*ft));
 172         fr_eof(fp) = ft->fcoe_eof;
 173         skb_trim(skb, skb->len - sizeof(*ft));
 174         return 0;
 175 drop:
 176         dev_kfree_skb_irq(skb);
 177         return -1;
 178 }
 179
 180 /**
 181  * fnic_update_mac_locked() - set data MAC address and filters.
 182  * @fnic:       fnic instance.
 183  * @new:        newly-assigned FCoE MAC address.
 184  *
 185  * Called with the fnic lock held.
 186  */
 187 void fnic_update_mac_locked(struct fnic *fnic, u8 *new)
 188 {
 189         u8 *ctl = fnic->ctlr.ctl_src_addr;
 190         u8 *data = fnic->data_src_addr;
 191
 192         if (is_zero_ether_addr(new))
 193                 new = ctl;
 194         if (!compare_ether_addr(data, new))
 195                 return;
 196         FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, "update_mac %pM\n", new);
 197         if (!is_zero_ether_addr(data) && compare_ether_addr(data, ctl))
 198                 vnic_dev_del_addr(fnic->vdev, data);
 199         memcpy(data, new, ETH_ALEN);
 200         if (compare_ether_addr(new, ctl))
 201                 vnic_dev_add_addr(fnic->vdev, new);
 202 }
 203
 204 /**
 205  * fnic_update_mac() - set data MAC address and filters.
 206  * @lport:      local port.
 207  * @new:        newly-assigned FCoE MAC address.
 208  */
 209 void fnic_update_mac(struct fc_lport *lport, u8 *new)
 210 {
 211         struct fnic *fnic = lport_priv(lport);
 212
 213         spin_lock_irq(&fnic->fnic_lock);
 214         fnic_update_mac_locked(fnic, new);
 215         spin_unlock_irq(&fnic->fnic_lock);
 216 }
 217
 218 /**
 219  * fnic_set_port_id() - set the port_ID after successful FLOGI.
 220  * @lport:      local port.
 221  * @port_id:    assigned FC_ID.
 222  * @fp:         received frame containing the FLOGI accept or NULL.
 223  *
 224  * This is called from libfc when a new FC_ID has been assigned.
 225  * This causes us to reset the firmware to FC_MODE and setup the new MAC
 226  * address and FC_ID.
 227  *
 228  * It is also called with FC_ID 0 when we're logged off.
 229  *
 230  * If the FC_ID is due to point-to-point, fp may be NULL.
 231  */
 232 void fnic_set_port_id(struct fc_lport *lport, u32 port_id, struct fc_frame *fp)
 233 {
 234         struct fnic *fnic = lport_priv(lport);
 235         u8 *mac;
 236         int ret;
 237
 238         FNIC_FCS_DBG(KERN_DEBUG, lport->host, "set port_id %x fp %p\n",
 239                      port_id, fp);
 240
 241         /*
 242          * If we're clearing the FC_ID, change to use the ctl_src_addr.
 243          * Set ethernet mode to send FLOGI.
 244          */
 245         if (!port_id) {
 246                 fnic_update_mac(lport, fnic->ctlr.ctl_src_addr);
 247                 fnic_set_eth_mode(fnic);
 248                 return;
 249         }
 250
 251         if (fp) {
 252                 mac = fr_cb(fp)->granted_mac;
 253                 if (is_zero_ether_addr(mac)) {
 254                         /* non-FIP - FLOGI already accepted - ignore return */
 255                         fcoe_ctlr_recv_flogi(&fnic->ctlr, lport, fp);
 256                 }
 257                 fnic_update_mac(lport, mac);
 258         }
 259
 260         /* Change state to reflect transition to FC mode */
 261         spin_lock_irq(&fnic->fnic_lock);
 262         if (fnic->state == FNIC_IN_ETH_MODE || fnic->state == FNIC_IN_FC_MODE)
 263                 fnic->state = FNIC_IN_ETH_TRANS_FC_MODE;
 264         else {
 265                 FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
 266                              "Unexpected fnic state %s while"
 267                              " processing flogi resp\n",
 268                              fnic_state_to_str(fnic->state));
 269                 spin_unlock_irq(&fnic->fnic_lock);
 270                 return;
 271         }
 272         spin_unlock_irq(&fnic->fnic_lock);
 273
 274         /*
 275          * Send FLOGI registration to firmware to set up FC mode.
 276          * The new address will be set up when registration completes.
 277          */
 278         ret = fnic_flogi_reg_handler(fnic, port_id);
 279
 280         if (ret < 0) {
 281                 spin_lock_irq(&fnic->fnic_lock);
 282                 if (fnic->state == FNIC_IN_ETH_TRANS_FC_MODE)
 283                         fnic->state = FNIC_IN_ETH_MODE;
 284                 spin_unlock_irq(&fnic->fnic_lock);
 285         }
 286 }
 287
 288 static void fnic_rq_cmpl_frame_recv(struct vnic_rq *rq, struct cq_desc
 289                                     *cq_desc, struct vnic_rq_buf *buf,
 290                                     int skipped __attribute__((unused)),
 291                                     void *opaque)
 292 {
 293         struct fnic *fnic = vnic_dev_priv(rq->vdev);
 294         struct sk_buff *skb;
 295         struct fc_frame *fp;
 296         unsigned int eth_hdrs_stripped;
 297         u8 type, color, eop, sop, ingress_port, vlan_stripped;
 298         u8 fcoe = 0, fcoe_sof, fcoe_eof;
 299         u8 fcoe_fc_crc_ok = 1, fcoe_enc_error = 0;
 300         u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
 301         u8 ipv6, ipv4, ipv4_fragment, rss_type, csum_not_calc;
 302         u8 fcs_ok = 1, packet_error = 0;
 303         u16 q_number, completed_index, bytes_written = 0, vlan, checksum;
 304         u32 rss_hash;
 305         u16 exchange_id, tmpl;
 306         u8 sof = 0;
 307         u8 eof = 0;
 308         u32 fcp_bytes_written = 0;
 309         unsigned long flags;
 310
 311         pci_unmap_single(fnic->pdev, buf->dma_addr, buf->len,
 312                          PCI_DMA_FROMDEVICE);
 313         skb = buf->os_buf;
 314         fp = (struct fc_frame *)skb;
 315         buf->os_buf = NULL;
 316
 317         cq_desc_dec(cq_desc, &type, &color, &q_number, &completed_index);
 318         if (type == CQ_DESC_TYPE_RQ_FCP) {
 319                 cq_fcp_rq_desc_dec((struct cq_fcp_rq_desc *)cq_desc,
 320                                    &type, &color, &q_number, &completed_index,
 321                                    &eop, &sop, &fcoe_fc_crc_ok, &exchange_id,
 322                                    &tmpl, &fcp_bytes_written, &sof, &eof,
 323                                    &ingress_port, &packet_error,
 324                                    &fcoe_enc_error, &fcs_ok, &vlan_stripped,
 325                                    &vlan);
 326                 eth_hdrs_stripped = 1;
 327                 skb_trim(skb, fcp_bytes_written);
 328                 fr_sof(fp) = sof;
 329                 fr_eof(fp) = eof;
 330
 331         } else if (type == CQ_DESC_TYPE_RQ_ENET) {
 332                 cq_enet_rq_desc_dec((struct cq_enet_rq_desc *)cq_desc,
 333                                     &type, &color, &q_number, &completed_index,
 334                                     &ingress_port, &fcoe, &eop, &sop,
 335                                     &rss_type, &csum_not_calc, &rss_hash,
 336                                     &bytes_written, &packet_error,
 337                                     &vlan_stripped, &vlan, &checksum,
 338                                     &fcoe_sof, &fcoe_fc_crc_ok,
 339                                     &fcoe_enc_error, &fcoe_eof,
 340                                     &tcp_udp_csum_ok, &udp, &tcp,
 341                                     &ipv4_csum_ok, &ipv6, &ipv4,
 342                                     &ipv4_fragment, &fcs_ok);
 343                 eth_hdrs_stripped = 0;
 344                 skb_trim(skb, bytes_written);
 345                 if (!fcs_ok) {
 346                         FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
 347                                      "fcs error.  dropping packet.\n");
 348                         goto drop;
 349                 }
 350                 if (fnic_import_rq_eth_pkt(fnic, skb))
 351                         return;
 352
 353         } else {
 354                 /* wrong CQ type*/
 355                 shost_printk(KERN_ERR, fnic->lport->host,
 356                              "fnic rq_cmpl wrong cq type x%x\n", type);
 357                 goto drop;
 358         }
 359
 360         if (!fcs_ok || packet_error || !fcoe_fc_crc_ok || fcoe_enc_error) {
 361                 FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
 362                              "fnic rq_cmpl fcoe x%x fcsok x%x"
 363                              " pkterr x%x fcoe_fc_crc_ok x%x, fcoe_enc_err"
 364                              " x%x\n",
 365                              fcoe, fcs_ok, packet_error,
 366                              fcoe_fc_crc_ok, fcoe_enc_error);
 367                 goto drop;
 368         }
 369
 370         spin_lock_irqsave(&fnic->fnic_lock, flags);
 371         if (fnic->stop_rx_link_events) {
 372                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 373                 goto drop;
 374         }
 375         fr_dev(fp) = fnic->lport;
 376         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 377
 378         skb_queue_tail(&fnic->frame_queue, skb);
 379         queue_work(fnic_event_queue, &fnic->frame_work);
 380
 381         return;
 382 drop:
 383         dev_kfree_skb_irq(skb);
 384 }
 385
 386 static int fnic_rq_cmpl_handler_cont(struct vnic_dev *vdev,
 387                                      struct cq_desc *cq_desc, u8 type,
 388                                      u16 q_number, u16 completed_index,
 389                                      void *opaque)
 390 {
 391         struct fnic *fnic = vnic_dev_priv(vdev);
 392
 393         vnic_rq_service(&fnic->rq[q_number], cq_desc, completed_index,
 394                         VNIC_RQ_RETURN_DESC, fnic_rq_cmpl_frame_recv,
 395                         NULL);
 396         return 0;
 397 }
 398
 399 int fnic_rq_cmpl_handler(struct fnic *fnic, int rq_work_to_do)
 400 {
 401         unsigned int tot_rq_work_done = 0, cur_work_done;
 402         unsigned int i;
 403         int err;
 404
 405         for (i = 0; i < fnic->rq_count; i++) {
 406                 cur_work_done = vnic_cq_service(&fnic->cq[i], rq_work_to_do,
 407                                                 fnic_rq_cmpl_handler_cont,
 408                                                 NULL);
 409                 if (cur_work_done) {
 410                         err = vnic_rq_fill(&fnic->rq[i], fnic_alloc_rq_frame);
 411                         if (err)
 412                                 shost_printk(KERN_ERR, fnic->lport->host,
 413                                              "fnic_alloc_rq_frame cant alloc"
 414                                              " frame\n");
 415                 }
 416                 tot_rq_work_done += cur_work_done;
 417         }
 418
 419         return tot_rq_work_done;
 420 }
 421
 422 /*
 423  * This function is called once at init time to allocate and fill RQ
 424  * buffers. Subsequently, it is called in the interrupt context after RQ
 425  * buffer processing to replenish the buffers in the RQ
 426  */
 427 int fnic_alloc_rq_frame(struct vnic_rq *rq)
 428 {
 429         struct fnic *fnic = vnic_dev_priv(rq->vdev);
 430         struct sk_buff *skb;
 431         u16 len;
 432         dma_addr_t pa;
 433
 434         len = FC_FRAME_HEADROOM + FC_MAX_FRAME + FC_FRAME_TAILROOM;
 435         skb = dev_alloc_skb(len);
 436         if (!skb) {
 437                 FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
 438                              "Unable to allocate RQ sk_buff\n");
 439                 return -ENOMEM;
 440         }
 441         skb_reset_mac_header(skb);
 442         skb_reset_transport_header(skb);
 443         skb_reset_network_header(skb);
 444         skb_put(skb, len);
 445         pa = pci_map_single(fnic->pdev, skb->data, len, PCI_DMA_FROMDEVICE);
 446         fnic_queue_rq_desc(rq, skb, pa, len);
 447         return 0;
 448 }
 449
 450 void fnic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf)
 451 {
 452         struct fc_frame *fp = buf->os_buf;
 453         struct fnic *fnic = vnic_dev_priv(rq->vdev);
 454
 455         pci_unmap_single(fnic->pdev, buf->dma_addr, buf->len,
 456                          PCI_DMA_FROMDEVICE);
 457
 458         dev_kfree_skb(fp_skb(fp));
 459         buf->os_buf = NULL;
 460 }
 461
 462 /**
 463  * fnic_eth_send() - Send Ethernet frame.
 464  * @fip:        fcoe_ctlr instance.
 465  * @skb:        Ethernet Frame, FIP, without VLAN encapsulation.
 466  */
 467 void fnic_eth_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
 468 {
 469         struct fnic *fnic = fnic_from_ctlr(fip);
 470         struct vnic_wq *wq = &fnic->wq[0];
 471         dma_addr_t pa;
 472         struct ethhdr *eth_hdr;
 473         struct vlan_ethhdr *vlan_hdr;
 474         unsigned long flags;
 475
 476         if (!fnic->vlan_hw_insert) {
 477                 eth_hdr = (struct ethhdr *)skb_mac_header(skb);
 478                 vlan_hdr = (struct vlan_ethhdr *)skb_push(skb,
 479                                 sizeof(*vlan_hdr) - sizeof(*eth_hdr));
 480                 memcpy(vlan_hdr, eth_hdr, 2 * ETH_ALEN);
 481                 vlan_hdr->h_vlan_proto = htons(ETH_P_8021Q);
 482                 vlan_hdr->h_vlan_encapsulated_proto = eth_hdr->h_proto;
 483                 vlan_hdr->h_vlan_TCI = htons(fnic->vlan_id);
 484         }
 485
 486         pa = pci_map_single(fnic->pdev, skb->data, skb->len, PCI_DMA_TODEVICE);
 487
 488         spin_lock_irqsave(&fnic->wq_lock[0], flags);
 489         if (!vnic_wq_desc_avail(wq)) {
 490                 pci_unmap_single(fnic->pdev, pa, skb->len, PCI_DMA_TODEVICE);
 491                 spin_unlock_irqrestore(&fnic->wq_lock[0], flags);
 492                 kfree_skb(skb);
 493                 return;
 494         }
 495
 496         fnic_queue_wq_eth_desc(wq, skb, pa, skb->len,
 497                                fnic->vlan_hw_insert, fnic->vlan_id, 1);
 498         spin_unlock_irqrestore(&fnic->wq_lock[0], flags);
 499 }
 500
 501 /*
 502  * Send FC frame.
 503  */
 504 static int fnic_send_frame(struct fnic *fnic, struct fc_frame *fp)
 505 {
 506         struct vnic_wq *wq = &fnic->wq[0];
 507         struct sk_buff *skb;
 508         dma_addr_t pa;
 509         struct ethhdr *eth_hdr;
 510         struct vlan_ethhdr *vlan_hdr;
 511         struct fcoe_hdr *fcoe_hdr;
 512         struct fc_frame_header *fh;
 513         u32 tot_len, eth_hdr_len;
 514         int ret = 0;
 515         unsigned long flags;
 516
 517         fh = fc_frame_header_get(fp);
 518         skb = fp_skb(fp);
 519
 520         if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ) &&
 521             fcoe_ctlr_els_send(&fnic->ctlr, fnic->lport, skb))
 522                 return 0;
 523
 524         if (!fnic->vlan_hw_insert) {
 525                 eth_hdr_len = sizeof(*vlan_hdr) + sizeof(*fcoe_hdr);
 526                 vlan_hdr = (struct vlan_ethhdr *)skb_push(skb, eth_hdr_len);
 527                 eth_hdr = (struct ethhdr *)vlan_hdr;
 528                 vlan_hdr->h_vlan_proto = htons(ETH_P_8021Q);
 529                 vlan_hdr->h_vlan_encapsulated_proto = htons(ETH_P_FCOE);
 530                 vlan_hdr->h_vlan_TCI = htons(fnic->vlan_id);
 531                 fcoe_hdr = (struct fcoe_hdr *)(vlan_hdr + 1);
 532         } else {
 533                 eth_hdr_len = sizeof(*eth_hdr) + sizeof(*fcoe_hdr);
 534                 eth_hdr = (struct ethhdr *)skb_push(skb, eth_hdr_len);
 535                 eth_hdr->h_proto = htons(ETH_P_FCOE);
 536                 fcoe_hdr = (struct fcoe_hdr *)(eth_hdr + 1);
 537         }
 538
 539         if (fnic->ctlr.map_dest)
 540                 fc_fcoe_set_mac(eth_hdr->h_dest, fh->fh_d_id);
 541         else
 542                 memcpy(eth_hdr->h_dest, fnic->ctlr.dest_addr, ETH_ALEN);
 543         memcpy(eth_hdr->h_source, fnic->data_src_addr, ETH_ALEN);
 544
 545         tot_len = skb->len;
 546         BUG_ON(tot_len % 4);
 547
 548         memset(fcoe_hdr, 0, sizeof(*fcoe_hdr));
 549         fcoe_hdr->fcoe_sof = fr_sof(fp);
 550         if (FC_FCOE_VER)
 551                 FC_FCOE_ENCAPS_VER(fcoe_hdr, FC_FCOE_VER);
 552
 553         pa = pci_map_single(fnic->pdev, eth_hdr, tot_len, PCI_DMA_TODEVICE);
 554
 555         spin_lock_irqsave(&fnic->wq_lock[0], flags);
 556
 557         if (!vnic_wq_desc_avail(wq)) {
 558                 pci_unmap_single(fnic->pdev, pa,
 559                                  tot_len, PCI_DMA_TODEVICE);
 560                 ret = -1;
 561                 goto fnic_send_frame_end;
 562         }
 563
 564         fnic_queue_wq_desc(wq, skb, pa, tot_len, fr_eof(fp),
 565                            fnic->vlan_hw_insert, fnic->vlan_id, 1, 1, 1);
 566 fnic_send_frame_end:
 567         spin_unlock_irqrestore(&fnic->wq_lock[0], flags);
 568
 569         if (ret)
 570                 dev_kfree_skb_any(fp_skb(fp));
 571
 572         return ret;
 573 }
 574
 575 /*
 576  * fnic_send
 577  * Routine to send a raw frame
 578  */
 579 int fnic_send(struct fc_lport *lp, struct fc_frame *fp)
 580 {
 581         struct fnic *fnic = lport_priv(lp);
 582         unsigned long flags;
 583
 584         if (fnic->in_remove) {
 585                 dev_kfree_skb(fp_skb(fp));
 586                 return -1;
 587         }
 588
 589         /*
 590          * Queue frame if in a transitional state.
 591          * This occurs while registering the Port_ID / MAC address after FLOGI.
 592          */
 593         spin_lock_irqsave(&fnic->fnic_lock, flags);
 594         if (fnic->state != FNIC_IN_FC_MODE && fnic->state != FNIC_IN_ETH_MODE) {
 595                 skb_queue_tail(&fnic->tx_queue, fp_skb(fp));
 596                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 597                 return 0;
 598         }
 599         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 600
 601         return fnic_send_frame(fnic, fp);
 602 }
 603
 604 /**
 605  * fnic_flush_tx() - send queued frames.
 606  * @fnic: fnic device
 607  *
 608  * Send frames that were waiting to go out in FC or Ethernet mode.
 609  * Whenever changing modes we purge queued frames, so these frames should
 610  * be queued for the stable mode that we're in, either FC or Ethernet.
 611  *
 612  * Called without fnic_lock held.
 613  */
 614 void fnic_flush_tx(struct fnic *fnic)
 615 {
 616         struct sk_buff *skb;
 617         struct fc_frame *fp;
 618
 619         while ((skb = skb_dequeue(&fnic->frame_queue))) {
 620                 fp = (struct fc_frame *)skb;
 621                 fnic_send_frame(fnic, fp);
 622         }
 623 }
 624
 625 /**
 626  * fnic_set_eth_mode() - put fnic into ethernet mode.
 627  * @fnic: fnic device
 628  *
 629  * Called without fnic lock held.
 630  */
 631 static void fnic_set_eth_mode(struct fnic *fnic)
 632 {
 633         unsigned long flags;
 634         enum fnic_state old_state;
 635         int ret;
 636
 637         spin_lock_irqsave(&fnic->fnic_lock, flags);
 638 again:
 639         old_state = fnic->state;
 640         switch (old_state) {
 641         case FNIC_IN_FC_MODE:
 642         case FNIC_IN_ETH_TRANS_FC_MODE:
 643         default:
 644                 fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
 645                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 646
 647                 ret = fnic_fw_reset_handler(fnic);
 648
 649                 spin_lock_irqsave(&fnic->fnic_lock, flags);
 650                 if (fnic->state != FNIC_IN_FC_TRANS_ETH_MODE)
 651                         goto again;
 652                 if (ret)
 653                         fnic->state = old_state;
 654                 break;
 655
 656         case FNIC_IN_FC_TRANS_ETH_MODE:
 657         case FNIC_IN_ETH_MODE:
 658                 break;
 659         }
 660         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 661 }
 662
 663 static void fnic_wq_complete_frame_send(struct vnic_wq *wq,
 664                                         struct cq_desc *cq_desc,
 665                                         struct vnic_wq_buf *buf, void *opaque)
 666 {
 667         struct sk_buff *skb = buf->os_buf;
 668         struct fc_frame *fp = (struct fc_frame *)skb;
 669         struct fnic *fnic = vnic_dev_priv(wq->vdev);
 670
 671         pci_unmap_single(fnic->pdev, buf->dma_addr,
 672                          buf->len, PCI_DMA_TODEVICE);
 673         dev_kfree_skb_irq(fp_skb(fp));
 674         buf->os_buf = NULL;
 675 }
 676
 677 static int fnic_wq_cmpl_handler_cont(struct vnic_dev *vdev,
 678                                      struct cq_desc *cq_desc, u8 type,
 679                                      u16 q_number, u16 completed_index,
 680                                      void *opaque)
 681 {
 682         struct fnic *fnic = vnic_dev_priv(vdev);
 683         unsigned long flags;
 684
 685         spin_lock_irqsave(&fnic->wq_lock[q_number], flags);
 686         vnic_wq_service(&fnic->wq[q_number], cq_desc, completed_index,
 687                         fnic_wq_complete_frame_send, NULL);
 688         spin_unlock_irqrestore(&fnic->wq_lock[q_number], flags);
 689
 690         return 0;
 691 }
 692
 693 int fnic_wq_cmpl_handler(struct fnic *fnic, int work_to_do)
 694 {
 695         unsigned int wq_work_done = 0;
 696         unsigned int i;
 697
 698         for (i = 0; i < fnic->raw_wq_count; i++) {
 699                 wq_work_done  += vnic_cq_service(&fnic->cq[fnic->rq_count+i],
 700                                                  work_to_do,
 701                                                  fnic_wq_cmpl_handler_cont,
 702                                                  NULL);
 703         }
 704
 705         return wq_work_done;
 706 }
 707
 708
 709 void fnic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
 710 {
 711         struct fc_frame *fp = buf->os_buf;
 712         struct fnic *fnic = vnic_dev_priv(wq->vdev);
 713
 714         pci_unmap_single(fnic->pdev, buf->dma_addr,
 715                          buf->len, PCI_DMA_TODEVICE);
 716
 717         dev_kfree_skb(fp_skb(fp));
 718         buf->os_buf = NULL;
 719 }