Abhijeet Joglekar | 5df6d73 | 2009-04-17 18:33:26 -0700 | [diff] [blame] | 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_els.h> |
| 27 | #include <scsi/fc/fc_fcoe.h> |
| 28 | #include <scsi/fc_frame.h> |
| 29 | #include <scsi/libfc.h> |
| 30 | #include "fnic_io.h" |
| 31 | #include "fnic.h" |
| 32 | #include "cq_enet_desc.h" |
| 33 | #include "cq_exch_desc.h" |
| 34 | |
| 35 | struct workqueue_struct *fnic_event_queue; |
| 36 | |
| 37 | void fnic_handle_link(struct work_struct *work) |
| 38 | { |
| 39 | struct fnic *fnic = container_of(work, struct fnic, link_work); |
| 40 | unsigned long flags; |
| 41 | int old_link_status; |
| 42 | u32 old_link_down_cnt; |
| 43 | |
| 44 | spin_lock_irqsave(&fnic->fnic_lock, flags); |
| 45 | |
| 46 | if (fnic->stop_rx_link_events) { |
| 47 | spin_unlock_irqrestore(&fnic->fnic_lock, flags); |
| 48 | return; |
| 49 | } |
| 50 | |
| 51 | old_link_down_cnt = fnic->link_down_cnt; |
| 52 | old_link_status = fnic->link_status; |
| 53 | fnic->link_status = vnic_dev_link_status(fnic->vdev); |
| 54 | fnic->link_down_cnt = vnic_dev_link_down_cnt(fnic->vdev); |
| 55 | |
| 56 | if (old_link_status == fnic->link_status) { |
| 57 | if (!fnic->link_status) |
| 58 | /* DOWN -> DOWN */ |
| 59 | spin_unlock_irqrestore(&fnic->fnic_lock, flags); |
| 60 | else { |
| 61 | if (old_link_down_cnt != fnic->link_down_cnt) { |
| 62 | /* UP -> DOWN -> UP */ |
| 63 | fnic->lport->host_stats.link_failure_count++; |
| 64 | spin_unlock_irqrestore(&fnic->fnic_lock, flags); |
| 65 | FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, |
| 66 | "link down\n"); |
| 67 | fc_linkdown(fnic->lport); |
| 68 | FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, |
| 69 | "link up\n"); |
| 70 | fc_linkup(fnic->lport); |
| 71 | } else |
| 72 | /* UP -> UP */ |
| 73 | spin_unlock_irqrestore(&fnic->fnic_lock, flags); |
| 74 | } |
| 75 | } else if (fnic->link_status) { |
| 76 | /* DOWN -> UP */ |
| 77 | spin_unlock_irqrestore(&fnic->fnic_lock, flags); |
| 78 | FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, "link up\n"); |
| 79 | fc_linkup(fnic->lport); |
| 80 | } else { |
| 81 | /* UP -> DOWN */ |
| 82 | fnic->lport->host_stats.link_failure_count++; |
| 83 | spin_unlock_irqrestore(&fnic->fnic_lock, flags); |
| 84 | FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, "link down\n"); |
| 85 | fc_linkdown(fnic->lport); |
| 86 | } |
| 87 | |
| 88 | } |
| 89 | |
| 90 | /* |
| 91 | * This function passes incoming fabric frames to libFC |
| 92 | */ |
| 93 | void fnic_handle_frame(struct work_struct *work) |
| 94 | { |
| 95 | struct fnic *fnic = container_of(work, struct fnic, frame_work); |
| 96 | struct fc_lport *lp = fnic->lport; |
| 97 | unsigned long flags; |
| 98 | struct sk_buff *skb; |
| 99 | struct fc_frame *fp; |
| 100 | |
| 101 | while ((skb = skb_dequeue(&fnic->frame_queue))) { |
| 102 | |
| 103 | spin_lock_irqsave(&fnic->fnic_lock, flags); |
| 104 | if (fnic->stop_rx_link_events) { |
| 105 | spin_unlock_irqrestore(&fnic->fnic_lock, flags); |
| 106 | dev_kfree_skb(skb); |
| 107 | return; |
| 108 | } |
| 109 | fp = (struct fc_frame *)skb; |
| 110 | /* if Flogi resp frame, register the address */ |
| 111 | if (fr_flags(fp)) { |
| 112 | vnic_dev_add_addr(fnic->vdev, |
| 113 | fnic->data_src_addr); |
| 114 | fr_flags(fp) = 0; |
| 115 | } |
| 116 | spin_unlock_irqrestore(&fnic->fnic_lock, flags); |
| 117 | |
| 118 | fc_exch_recv(lp, lp->emp, fp); |
| 119 | } |
| 120 | |
| 121 | } |
| 122 | |
| 123 | static inline void fnic_import_rq_fc_frame(struct sk_buff *skb, |
| 124 | u32 len, u8 sof, u8 eof) |
| 125 | { |
| 126 | struct fc_frame *fp = (struct fc_frame *)skb; |
| 127 | |
| 128 | skb_trim(skb, len); |
| 129 | fr_eof(fp) = eof; |
| 130 | fr_sof(fp) = sof; |
| 131 | } |
| 132 | |
| 133 | |
| 134 | static inline int fnic_import_rq_eth_pkt(struct sk_buff *skb, u32 len) |
| 135 | { |
| 136 | struct fc_frame *fp; |
| 137 | struct ethhdr *eh; |
| 138 | struct vlan_ethhdr *vh; |
| 139 | struct fcoe_hdr *fcoe_hdr; |
| 140 | struct fcoe_crc_eof *ft; |
| 141 | u32 transport_len = 0; |
| 142 | |
| 143 | eh = (struct ethhdr *)skb->data; |
| 144 | vh = (struct vlan_ethhdr *)skb->data; |
| 145 | if (vh->h_vlan_proto == htons(ETH_P_8021Q) && |
| 146 | vh->h_vlan_encapsulated_proto == htons(ETH_P_FCOE)) { |
| 147 | skb_pull(skb, sizeof(struct vlan_ethhdr)); |
| 148 | transport_len += sizeof(struct vlan_ethhdr); |
| 149 | } else if (eh->h_proto == htons(ETH_P_FCOE)) { |
| 150 | transport_len += sizeof(struct ethhdr); |
| 151 | skb_pull(skb, sizeof(struct ethhdr)); |
| 152 | } else |
| 153 | return -1; |
| 154 | |
| 155 | fcoe_hdr = (struct fcoe_hdr *)skb->data; |
| 156 | if (FC_FCOE_DECAPS_VER(fcoe_hdr) != FC_FCOE_VER) |
| 157 | return -1; |
| 158 | |
| 159 | fp = (struct fc_frame *)skb; |
| 160 | fc_frame_init(fp); |
| 161 | fr_sof(fp) = fcoe_hdr->fcoe_sof; |
| 162 | skb_pull(skb, sizeof(struct fcoe_hdr)); |
| 163 | transport_len += sizeof(struct fcoe_hdr); |
| 164 | |
| 165 | ft = (struct fcoe_crc_eof *)(skb->data + len - |
| 166 | transport_len - sizeof(*ft)); |
| 167 | fr_eof(fp) = ft->fcoe_eof; |
| 168 | skb_trim(skb, len - transport_len - sizeof(*ft)); |
| 169 | return 0; |
| 170 | } |
| 171 | |
| 172 | static inline int fnic_handle_flogi_resp(struct fnic *fnic, |
| 173 | struct fc_frame *fp) |
| 174 | { |
| 175 | u8 mac[ETH_ALEN] = FC_FCOE_FLOGI_MAC; |
| 176 | struct ethhdr *eth_hdr; |
| 177 | struct fc_frame_header *fh; |
| 178 | int ret = 0; |
| 179 | unsigned long flags; |
| 180 | struct fc_frame *old_flogi_resp = NULL; |
| 181 | |
| 182 | fh = (struct fc_frame_header *)fr_hdr(fp); |
| 183 | |
| 184 | spin_lock_irqsave(&fnic->fnic_lock, flags); |
| 185 | |
| 186 | if (fnic->state == FNIC_IN_ETH_MODE) { |
| 187 | |
| 188 | /* |
| 189 | * Check if oxid matches on taking the lock. A new Flogi |
| 190 | * issued by libFC might have changed the fnic cached oxid |
| 191 | */ |
| 192 | if (fnic->flogi_oxid != ntohs(fh->fh_ox_id)) { |
| 193 | FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, |
| 194 | "Flogi response oxid not" |
| 195 | " matching cached oxid, dropping frame" |
| 196 | "\n"); |
| 197 | ret = -1; |
| 198 | spin_unlock_irqrestore(&fnic->fnic_lock, flags); |
| 199 | dev_kfree_skb_irq(fp_skb(fp)); |
| 200 | goto handle_flogi_resp_end; |
| 201 | } |
| 202 | |
| 203 | /* Drop older cached flogi response frame, cache this frame */ |
| 204 | old_flogi_resp = fnic->flogi_resp; |
| 205 | fnic->flogi_resp = fp; |
| 206 | fnic->flogi_oxid = FC_XID_UNKNOWN; |
| 207 | |
| 208 | /* |
| 209 | * this frame is part of flogi get the src mac addr from this |
| 210 | * frame if the src mac is fcoui based then we mark the |
| 211 | * address mode flag to use fcoui base for dst mac addr |
| 212 | * otherwise we have to store the fcoe gateway addr |
| 213 | */ |
| 214 | eth_hdr = (struct ethhdr *)skb_mac_header(fp_skb(fp)); |
| 215 | memcpy(mac, eth_hdr->h_source, ETH_ALEN); |
| 216 | |
| 217 | if (ntoh24(mac) == FC_FCOE_OUI) |
| 218 | fnic->fcoui_mode = 1; |
| 219 | else { |
| 220 | fnic->fcoui_mode = 0; |
| 221 | memcpy(fnic->dest_addr, mac, ETH_ALEN); |
| 222 | } |
| 223 | |
| 224 | /* |
| 225 | * Except for Flogi frame, all outbound frames from us have the |
| 226 | * Eth Src address as FC_FCOE_OUI"our_sid". Flogi frame uses |
| 227 | * the vnic MAC address as the Eth Src address |
| 228 | */ |
| 229 | fc_fcoe_set_mac(fnic->data_src_addr, fh->fh_d_id); |
| 230 | |
| 231 | /* We get our s_id from the d_id of the flogi resp frame */ |
| 232 | fnic->s_id = ntoh24(fh->fh_d_id); |
| 233 | |
| 234 | /* Change state to reflect transition from Eth to FC mode */ |
| 235 | fnic->state = FNIC_IN_ETH_TRANS_FC_MODE; |
| 236 | |
| 237 | } else { |
| 238 | FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, |
| 239 | "Unexpected fnic state %s while" |
| 240 | " processing flogi resp\n", |
| 241 | fnic_state_to_str(fnic->state)); |
| 242 | ret = -1; |
| 243 | spin_unlock_irqrestore(&fnic->fnic_lock, flags); |
| 244 | dev_kfree_skb_irq(fp_skb(fp)); |
| 245 | goto handle_flogi_resp_end; |
| 246 | } |
| 247 | |
| 248 | spin_unlock_irqrestore(&fnic->fnic_lock, flags); |
| 249 | |
| 250 | /* Drop older cached frame */ |
| 251 | if (old_flogi_resp) |
| 252 | dev_kfree_skb_irq(fp_skb(old_flogi_resp)); |
| 253 | |
| 254 | /* |
| 255 | * send flogi reg request to firmware, this will put the fnic in |
| 256 | * in FC mode |
| 257 | */ |
| 258 | ret = fnic_flogi_reg_handler(fnic); |
| 259 | |
| 260 | if (ret < 0) { |
| 261 | int free_fp = 1; |
| 262 | spin_lock_irqsave(&fnic->fnic_lock, flags); |
| 263 | /* |
| 264 | * free the frame is some other thread is not |
| 265 | * pointing to it |
| 266 | */ |
| 267 | if (fnic->flogi_resp != fp) |
| 268 | free_fp = 0; |
| 269 | else |
| 270 | fnic->flogi_resp = NULL; |
| 271 | |
| 272 | if (fnic->state == FNIC_IN_ETH_TRANS_FC_MODE) |
| 273 | fnic->state = FNIC_IN_ETH_MODE; |
| 274 | spin_unlock_irqrestore(&fnic->fnic_lock, flags); |
| 275 | if (free_fp) |
| 276 | dev_kfree_skb_irq(fp_skb(fp)); |
| 277 | } |
| 278 | |
| 279 | handle_flogi_resp_end: |
| 280 | return ret; |
| 281 | } |
| 282 | |
| 283 | /* Returns 1 for a response that matches cached flogi oxid */ |
| 284 | static inline int is_matching_flogi_resp_frame(struct fnic *fnic, |
| 285 | struct fc_frame *fp) |
| 286 | { |
| 287 | struct fc_frame_header *fh; |
| 288 | int ret = 0; |
| 289 | u32 f_ctl; |
| 290 | |
| 291 | fh = fc_frame_header_get(fp); |
| 292 | f_ctl = ntoh24(fh->fh_f_ctl); |
| 293 | |
| 294 | if (fnic->flogi_oxid == ntohs(fh->fh_ox_id) && |
| 295 | fh->fh_r_ctl == FC_RCTL_ELS_REP && |
| 296 | (f_ctl & (FC_FC_EX_CTX | FC_FC_SEQ_CTX)) == FC_FC_EX_CTX && |
| 297 | fh->fh_type == FC_TYPE_ELS) |
| 298 | ret = 1; |
| 299 | |
| 300 | return ret; |
| 301 | } |
| 302 | |
| 303 | static void fnic_rq_cmpl_frame_recv(struct vnic_rq *rq, struct cq_desc |
| 304 | *cq_desc, struct vnic_rq_buf *buf, |
| 305 | int skipped __attribute__((unused)), |
| 306 | void *opaque) |
| 307 | { |
| 308 | struct fnic *fnic = vnic_dev_priv(rq->vdev); |
| 309 | struct sk_buff *skb; |
| 310 | struct fc_frame *fp; |
| 311 | unsigned int eth_hdrs_stripped; |
| 312 | u8 type, color, eop, sop, ingress_port, vlan_stripped; |
| 313 | u8 fcoe = 0, fcoe_sof, fcoe_eof; |
| 314 | u8 fcoe_fc_crc_ok = 1, fcoe_enc_error = 0; |
| 315 | u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok; |
| 316 | u8 ipv6, ipv4, ipv4_fragment, rss_type, csum_not_calc; |
| 317 | u8 fcs_ok = 1, packet_error = 0; |
| 318 | u16 q_number, completed_index, bytes_written = 0, vlan, checksum; |
| 319 | u32 rss_hash; |
| 320 | u16 exchange_id, tmpl; |
| 321 | u8 sof = 0; |
| 322 | u8 eof = 0; |
| 323 | u32 fcp_bytes_written = 0; |
| 324 | unsigned long flags; |
| 325 | |
| 326 | pci_unmap_single(fnic->pdev, buf->dma_addr, buf->len, |
| 327 | PCI_DMA_FROMDEVICE); |
| 328 | skb = buf->os_buf; |
| 329 | buf->os_buf = NULL; |
| 330 | |
| 331 | cq_desc_dec(cq_desc, &type, &color, &q_number, &completed_index); |
| 332 | if (type == CQ_DESC_TYPE_RQ_FCP) { |
| 333 | cq_fcp_rq_desc_dec((struct cq_fcp_rq_desc *)cq_desc, |
| 334 | &type, &color, &q_number, &completed_index, |
| 335 | &eop, &sop, &fcoe_fc_crc_ok, &exchange_id, |
| 336 | &tmpl, &fcp_bytes_written, &sof, &eof, |
| 337 | &ingress_port, &packet_error, |
| 338 | &fcoe_enc_error, &fcs_ok, &vlan_stripped, |
| 339 | &vlan); |
| 340 | eth_hdrs_stripped = 1; |
| 341 | |
| 342 | } else if (type == CQ_DESC_TYPE_RQ_ENET) { |
| 343 | cq_enet_rq_desc_dec((struct cq_enet_rq_desc *)cq_desc, |
| 344 | &type, &color, &q_number, &completed_index, |
| 345 | &ingress_port, &fcoe, &eop, &sop, |
| 346 | &rss_type, &csum_not_calc, &rss_hash, |
| 347 | &bytes_written, &packet_error, |
| 348 | &vlan_stripped, &vlan, &checksum, |
| 349 | &fcoe_sof, &fcoe_fc_crc_ok, |
| 350 | &fcoe_enc_error, &fcoe_eof, |
| 351 | &tcp_udp_csum_ok, &udp, &tcp, |
| 352 | &ipv4_csum_ok, &ipv6, &ipv4, |
| 353 | &ipv4_fragment, &fcs_ok); |
| 354 | eth_hdrs_stripped = 0; |
| 355 | |
| 356 | } else { |
| 357 | /* wrong CQ type*/ |
| 358 | shost_printk(KERN_ERR, fnic->lport->host, |
| 359 | "fnic rq_cmpl wrong cq type x%x\n", type); |
| 360 | goto drop; |
| 361 | } |
| 362 | |
| 363 | if (!fcs_ok || packet_error || !fcoe_fc_crc_ok || fcoe_enc_error) { |
| 364 | FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, |
| 365 | "fnic rq_cmpl fcoe x%x fcsok x%x" |
| 366 | " pkterr x%x fcoe_fc_crc_ok x%x, fcoe_enc_err" |
| 367 | " x%x\n", |
| 368 | fcoe, fcs_ok, packet_error, |
| 369 | fcoe_fc_crc_ok, fcoe_enc_error); |
| 370 | goto drop; |
| 371 | } |
| 372 | |
| 373 | if (eth_hdrs_stripped) |
| 374 | fnic_import_rq_fc_frame(skb, fcp_bytes_written, sof, eof); |
| 375 | else if (fnic_import_rq_eth_pkt(skb, bytes_written)) |
| 376 | goto drop; |
| 377 | |
| 378 | fp = (struct fc_frame *)skb; |
| 379 | |
| 380 | /* |
| 381 | * If frame is an ELS response that matches the cached FLOGI OX_ID, |
| 382 | * and is accept, issue flogi_reg_request copy wq request to firmware |
| 383 | * to register the S_ID and determine whether FC_OUI mode or GW mode. |
| 384 | */ |
| 385 | if (is_matching_flogi_resp_frame(fnic, fp)) { |
| 386 | if (!eth_hdrs_stripped) { |
| 387 | if (fc_frame_payload_op(fp) == ELS_LS_ACC) { |
| 388 | fnic_handle_flogi_resp(fnic, fp); |
| 389 | return; |
| 390 | } |
| 391 | /* |
| 392 | * Recd. Flogi reject. No point registering |
| 393 | * with fw, but forward to libFC |
| 394 | */ |
| 395 | goto forward; |
| 396 | } |
| 397 | goto drop; |
| 398 | } |
| 399 | if (!eth_hdrs_stripped) |
| 400 | goto drop; |
| 401 | |
| 402 | forward: |
| 403 | spin_lock_irqsave(&fnic->fnic_lock, flags); |
| 404 | if (fnic->stop_rx_link_events) { |
| 405 | spin_unlock_irqrestore(&fnic->fnic_lock, flags); |
| 406 | goto drop; |
| 407 | } |
| 408 | /* Use fr_flags to indicate whether succ. flogi resp or not */ |
| 409 | fr_flags(fp) = 0; |
| 410 | fr_dev(fp) = fnic->lport; |
| 411 | spin_unlock_irqrestore(&fnic->fnic_lock, flags); |
| 412 | |
| 413 | skb_queue_tail(&fnic->frame_queue, skb); |
| 414 | queue_work(fnic_event_queue, &fnic->frame_work); |
| 415 | |
| 416 | return; |
| 417 | drop: |
| 418 | dev_kfree_skb_irq(skb); |
| 419 | } |
| 420 | |
| 421 | static int fnic_rq_cmpl_handler_cont(struct vnic_dev *vdev, |
| 422 | struct cq_desc *cq_desc, u8 type, |
| 423 | u16 q_number, u16 completed_index, |
| 424 | void *opaque) |
| 425 | { |
| 426 | struct fnic *fnic = vnic_dev_priv(vdev); |
| 427 | |
| 428 | vnic_rq_service(&fnic->rq[q_number], cq_desc, completed_index, |
| 429 | VNIC_RQ_RETURN_DESC, fnic_rq_cmpl_frame_recv, |
| 430 | NULL); |
| 431 | return 0; |
| 432 | } |
| 433 | |
| 434 | int fnic_rq_cmpl_handler(struct fnic *fnic, int rq_work_to_do) |
| 435 | { |
| 436 | unsigned int tot_rq_work_done = 0, cur_work_done; |
| 437 | unsigned int i; |
| 438 | int err; |
| 439 | |
| 440 | for (i = 0; i < fnic->rq_count; i++) { |
| 441 | cur_work_done = vnic_cq_service(&fnic->cq[i], rq_work_to_do, |
| 442 | fnic_rq_cmpl_handler_cont, |
| 443 | NULL); |
| 444 | if (cur_work_done) { |
| 445 | err = vnic_rq_fill(&fnic->rq[i], fnic_alloc_rq_frame); |
| 446 | if (err) |
| 447 | shost_printk(KERN_ERR, fnic->lport->host, |
| 448 | "fnic_alloc_rq_frame cant alloc" |
| 449 | " frame\n"); |
| 450 | } |
| 451 | tot_rq_work_done += cur_work_done; |
| 452 | } |
| 453 | |
| 454 | return tot_rq_work_done; |
| 455 | } |
| 456 | |
| 457 | /* |
| 458 | * This function is called once at init time to allocate and fill RQ |
| 459 | * buffers. Subsequently, it is called in the interrupt context after RQ |
| 460 | * buffer processing to replenish the buffers in the RQ |
| 461 | */ |
| 462 | int fnic_alloc_rq_frame(struct vnic_rq *rq) |
| 463 | { |
| 464 | struct fnic *fnic = vnic_dev_priv(rq->vdev); |
| 465 | struct sk_buff *skb; |
| 466 | u16 len; |
| 467 | dma_addr_t pa; |
| 468 | |
| 469 | len = FC_FRAME_HEADROOM + FC_MAX_FRAME + FC_FRAME_TAILROOM; |
| 470 | skb = dev_alloc_skb(len); |
| 471 | if (!skb) { |
| 472 | FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, |
| 473 | "Unable to allocate RQ sk_buff\n"); |
| 474 | return -ENOMEM; |
| 475 | } |
| 476 | skb_reset_mac_header(skb); |
| 477 | skb_reset_transport_header(skb); |
| 478 | skb_reset_network_header(skb); |
| 479 | skb_put(skb, len); |
| 480 | pa = pci_map_single(fnic->pdev, skb->data, len, PCI_DMA_FROMDEVICE); |
| 481 | fnic_queue_rq_desc(rq, skb, pa, len); |
| 482 | return 0; |
| 483 | } |
| 484 | |
| 485 | void fnic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf) |
| 486 | { |
| 487 | struct fc_frame *fp = buf->os_buf; |
| 488 | struct fnic *fnic = vnic_dev_priv(rq->vdev); |
| 489 | |
| 490 | pci_unmap_single(fnic->pdev, buf->dma_addr, buf->len, |
| 491 | PCI_DMA_FROMDEVICE); |
| 492 | |
| 493 | dev_kfree_skb(fp_skb(fp)); |
| 494 | buf->os_buf = NULL; |
| 495 | } |
| 496 | |
| 497 | static inline int is_flogi_frame(struct fc_frame_header *fh) |
| 498 | { |
| 499 | return fh->fh_r_ctl == FC_RCTL_ELS_REQ && *(u8 *)(fh + 1) == ELS_FLOGI; |
| 500 | } |
| 501 | |
| 502 | int fnic_send_frame(struct fnic *fnic, struct fc_frame *fp) |
| 503 | { |
| 504 | struct vnic_wq *wq = &fnic->wq[0]; |
| 505 | struct sk_buff *skb; |
| 506 | dma_addr_t pa; |
| 507 | struct ethhdr *eth_hdr; |
| 508 | struct vlan_ethhdr *vlan_hdr; |
| 509 | struct fcoe_hdr *fcoe_hdr; |
| 510 | struct fc_frame_header *fh; |
| 511 | u32 tot_len, eth_hdr_len; |
| 512 | int ret = 0; |
| 513 | unsigned long flags; |
| 514 | |
| 515 | fh = fc_frame_header_get(fp); |
| 516 | skb = fp_skb(fp); |
| 517 | |
| 518 | if (!fnic->vlan_hw_insert) { |
| 519 | eth_hdr_len = sizeof(*vlan_hdr) + sizeof(*fcoe_hdr); |
| 520 | vlan_hdr = (struct vlan_ethhdr *)skb_push(skb, eth_hdr_len); |
| 521 | eth_hdr = (struct ethhdr *)vlan_hdr; |
| 522 | vlan_hdr->h_vlan_proto = htons(ETH_P_8021Q); |
| 523 | vlan_hdr->h_vlan_encapsulated_proto = htons(ETH_P_FCOE); |
| 524 | vlan_hdr->h_vlan_TCI = htons(fnic->vlan_id); |
| 525 | fcoe_hdr = (struct fcoe_hdr *)(vlan_hdr + 1); |
| 526 | } else { |
| 527 | eth_hdr_len = sizeof(*eth_hdr) + sizeof(*fcoe_hdr); |
| 528 | eth_hdr = (struct ethhdr *)skb_push(skb, eth_hdr_len); |
| 529 | eth_hdr->h_proto = htons(ETH_P_FCOE); |
| 530 | fcoe_hdr = (struct fcoe_hdr *)(eth_hdr + 1); |
| 531 | } |
| 532 | |
| 533 | if (is_flogi_frame(fh)) { |
| 534 | fc_fcoe_set_mac(eth_hdr->h_dest, fh->fh_d_id); |
| 535 | memcpy(eth_hdr->h_source, fnic->mac_addr, ETH_ALEN); |
| 536 | } else { |
| 537 | if (fnic->fcoui_mode) |
| 538 | fc_fcoe_set_mac(eth_hdr->h_dest, fh->fh_d_id); |
| 539 | else |
| 540 | memcpy(eth_hdr->h_dest, fnic->dest_addr, ETH_ALEN); |
| 541 | memcpy(eth_hdr->h_source, fnic->data_src_addr, ETH_ALEN); |
| 542 | } |
| 543 | |
| 544 | tot_len = skb->len; |
| 545 | BUG_ON(tot_len % 4); |
| 546 | |
| 547 | memset(fcoe_hdr, 0, sizeof(*fcoe_hdr)); |
| 548 | fcoe_hdr->fcoe_sof = fr_sof(fp); |
| 549 | if (FC_FCOE_VER) |
| 550 | FC_FCOE_ENCAPS_VER(fcoe_hdr, FC_FCOE_VER); |
| 551 | |
| 552 | pa = pci_map_single(fnic->pdev, eth_hdr, tot_len, PCI_DMA_TODEVICE); |
| 553 | |
| 554 | spin_lock_irqsave(&fnic->wq_lock[0], flags); |
| 555 | |
| 556 | if (!vnic_wq_desc_avail(wq)) { |
| 557 | pci_unmap_single(fnic->pdev, pa, |
| 558 | tot_len, PCI_DMA_TODEVICE); |
| 559 | ret = -1; |
| 560 | goto fnic_send_frame_end; |
| 561 | } |
| 562 | |
| 563 | fnic_queue_wq_desc(wq, skb, pa, tot_len, fr_eof(fp), |
| 564 | fnic->vlan_hw_insert, fnic->vlan_id, 1, 1, 1); |
| 565 | fnic_send_frame_end: |
| 566 | spin_unlock_irqrestore(&fnic->wq_lock[0], flags); |
| 567 | |
| 568 | if (ret) |
| 569 | dev_kfree_skb_any(fp_skb(fp)); |
| 570 | |
| 571 | return ret; |
| 572 | } |
| 573 | |
| 574 | /* |
| 575 | * fnic_send |
| 576 | * Routine to send a raw frame |
| 577 | */ |
| 578 | int fnic_send(struct fc_lport *lp, struct fc_frame *fp) |
| 579 | { |
| 580 | struct fnic *fnic = lport_priv(lp); |
| 581 | struct fc_frame_header *fh; |
| 582 | int ret = 0; |
| 583 | enum fnic_state old_state; |
| 584 | unsigned long flags; |
| 585 | struct fc_frame *old_flogi = NULL; |
| 586 | struct fc_frame *old_flogi_resp = NULL; |
| 587 | |
| 588 | if (fnic->in_remove) { |
| 589 | dev_kfree_skb(fp_skb(fp)); |
| 590 | ret = -1; |
| 591 | goto fnic_send_end; |
| 592 | } |
| 593 | |
| 594 | fh = fc_frame_header_get(fp); |
| 595 | /* if not an Flogi frame, send it out, this is the common case */ |
| 596 | if (!is_flogi_frame(fh)) |
| 597 | return fnic_send_frame(fnic, fp); |
| 598 | |
| 599 | /* Flogi frame, now enter the state machine */ |
| 600 | |
| 601 | spin_lock_irqsave(&fnic->fnic_lock, flags); |
| 602 | again: |
| 603 | /* Get any old cached frames, free them after dropping lock */ |
| 604 | old_flogi = fnic->flogi; |
| 605 | fnic->flogi = NULL; |
| 606 | old_flogi_resp = fnic->flogi_resp; |
| 607 | fnic->flogi_resp = NULL; |
| 608 | |
| 609 | fnic->flogi_oxid = FC_XID_UNKNOWN; |
| 610 | |
| 611 | old_state = fnic->state; |
| 612 | switch (old_state) { |
| 613 | case FNIC_IN_FC_MODE: |
| 614 | case FNIC_IN_ETH_TRANS_FC_MODE: |
| 615 | default: |
| 616 | fnic->state = FNIC_IN_FC_TRANS_ETH_MODE; |
| 617 | vnic_dev_del_addr(fnic->vdev, fnic->data_src_addr); |
| 618 | spin_unlock_irqrestore(&fnic->fnic_lock, flags); |
| 619 | |
| 620 | if (old_flogi) { |
| 621 | dev_kfree_skb(fp_skb(old_flogi)); |
| 622 | old_flogi = NULL; |
| 623 | } |
| 624 | if (old_flogi_resp) { |
| 625 | dev_kfree_skb(fp_skb(old_flogi_resp)); |
| 626 | old_flogi_resp = NULL; |
| 627 | } |
| 628 | |
| 629 | ret = fnic_fw_reset_handler(fnic); |
| 630 | |
| 631 | spin_lock_irqsave(&fnic->fnic_lock, flags); |
| 632 | if (fnic->state != FNIC_IN_FC_TRANS_ETH_MODE) |
| 633 | goto again; |
| 634 | if (ret) { |
| 635 | fnic->state = old_state; |
| 636 | spin_unlock_irqrestore(&fnic->fnic_lock, flags); |
| 637 | dev_kfree_skb(fp_skb(fp)); |
| 638 | goto fnic_send_end; |
| 639 | } |
| 640 | old_flogi = fnic->flogi; |
| 641 | fnic->flogi = fp; |
| 642 | fnic->flogi_oxid = ntohs(fh->fh_ox_id); |
| 643 | old_flogi_resp = fnic->flogi_resp; |
| 644 | fnic->flogi_resp = NULL; |
| 645 | spin_unlock_irqrestore(&fnic->fnic_lock, flags); |
| 646 | break; |
| 647 | |
| 648 | case FNIC_IN_FC_TRANS_ETH_MODE: |
| 649 | /* |
| 650 | * A reset is pending with the firmware. Store the flogi |
| 651 | * and its oxid. The transition out of this state happens |
| 652 | * only when Firmware completes the reset, either with |
| 653 | * success or failed. If success, transition to |
| 654 | * FNIC_IN_ETH_MODE, if fail, then transition to |
| 655 | * FNIC_IN_FC_MODE |
| 656 | */ |
| 657 | fnic->flogi = fp; |
| 658 | fnic->flogi_oxid = ntohs(fh->fh_ox_id); |
| 659 | spin_unlock_irqrestore(&fnic->fnic_lock, flags); |
| 660 | break; |
| 661 | |
| 662 | case FNIC_IN_ETH_MODE: |
| 663 | /* |
| 664 | * The fw/hw is already in eth mode. Store the oxid, |
| 665 | * and send the flogi frame out. The transition out of this |
| 666 | * state happens only we receive flogi response from the |
| 667 | * network, and the oxid matches the cached oxid when the |
| 668 | * flogi frame was sent out. If they match, then we issue |
| 669 | * a flogi_reg request and transition to state |
| 670 | * FNIC_IN_ETH_TRANS_FC_MODE |
| 671 | */ |
| 672 | fnic->flogi_oxid = ntohs(fh->fh_ox_id); |
| 673 | spin_unlock_irqrestore(&fnic->fnic_lock, flags); |
| 674 | ret = fnic_send_frame(fnic, fp); |
| 675 | break; |
| 676 | } |
| 677 | |
| 678 | fnic_send_end: |
| 679 | if (old_flogi) |
| 680 | dev_kfree_skb(fp_skb(old_flogi)); |
| 681 | if (old_flogi_resp) |
| 682 | dev_kfree_skb(fp_skb(old_flogi_resp)); |
| 683 | return ret; |
| 684 | } |
| 685 | |
| 686 | static void fnic_wq_complete_frame_send(struct vnic_wq *wq, |
| 687 | struct cq_desc *cq_desc, |
| 688 | struct vnic_wq_buf *buf, void *opaque) |
| 689 | { |
| 690 | struct sk_buff *skb = buf->os_buf; |
| 691 | struct fc_frame *fp = (struct fc_frame *)skb; |
| 692 | struct fnic *fnic = vnic_dev_priv(wq->vdev); |
| 693 | |
| 694 | pci_unmap_single(fnic->pdev, buf->dma_addr, |
| 695 | buf->len, PCI_DMA_TODEVICE); |
| 696 | dev_kfree_skb_irq(fp_skb(fp)); |
| 697 | buf->os_buf = NULL; |
| 698 | } |
| 699 | |
| 700 | static int fnic_wq_cmpl_handler_cont(struct vnic_dev *vdev, |
| 701 | struct cq_desc *cq_desc, u8 type, |
| 702 | u16 q_number, u16 completed_index, |
| 703 | void *opaque) |
| 704 | { |
| 705 | struct fnic *fnic = vnic_dev_priv(vdev); |
| 706 | unsigned long flags; |
| 707 | |
| 708 | spin_lock_irqsave(&fnic->wq_lock[q_number], flags); |
| 709 | vnic_wq_service(&fnic->wq[q_number], cq_desc, completed_index, |
| 710 | fnic_wq_complete_frame_send, NULL); |
| 711 | spin_unlock_irqrestore(&fnic->wq_lock[q_number], flags); |
| 712 | |
| 713 | return 0; |
| 714 | } |
| 715 | |
| 716 | int fnic_wq_cmpl_handler(struct fnic *fnic, int work_to_do) |
| 717 | { |
| 718 | unsigned int wq_work_done = 0; |
| 719 | unsigned int i; |
| 720 | |
| 721 | for (i = 0; i < fnic->raw_wq_count; i++) { |
| 722 | wq_work_done += vnic_cq_service(&fnic->cq[fnic->rq_count+i], |
| 723 | work_to_do, |
| 724 | fnic_wq_cmpl_handler_cont, |
| 725 | NULL); |
| 726 | } |
| 727 | |
| 728 | return wq_work_done; |
| 729 | } |
| 730 | |
| 731 | |
| 732 | void fnic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf) |
| 733 | { |
| 734 | struct fc_frame *fp = buf->os_buf; |
| 735 | struct fnic *fnic = vnic_dev_priv(wq->vdev); |
| 736 | |
| 737 | pci_unmap_single(fnic->pdev, buf->dma_addr, |
| 738 | buf->len, PCI_DMA_TODEVICE); |
| 739 | |
| 740 | dev_kfree_skb(fp_skb(fp)); |
| 741 | buf->os_buf = NULL; |
| 742 | } |