/* * Copyright (c) 2008-2009 Cisco Systems, Inc. All rights reserved. * Copyright (c) 2009 Intel Corporation. All rights reserved. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. * * Maintained at www.Open-FCoE.org */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include MODULE_AUTHOR("Open-FCoE.org"); MODULE_DESCRIPTION("FIP discovery protocol support for FCoE HBAs"); MODULE_LICENSE("GPL v2"); #define FCOE_CTLR_MIN_FKA 500 /* min keep alive (mS) */ #define FCOE_CTLR_DEF_FKA FIP_DEF_FKA /* default keep alive (mS) */ static void fcoe_ctlr_timeout(unsigned long); static void fcoe_ctlr_timer_work(struct work_struct *); static void fcoe_ctlr_recv_work(struct work_struct *); static u8 fcoe_all_fcfs[ETH_ALEN] = FIP_ALL_FCF_MACS; unsigned int libfcoe_debug_logging; module_param_named(debug_logging, libfcoe_debug_logging, int, S_IRUGO|S_IWUSR); MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels"); #define LIBFCOE_LOGGING 0x01 /* General logging, not categorized */ #define LIBFCOE_FIP_LOGGING 0x02 /* FIP logging */ #define LIBFCOE_CHECK_LOGGING(LEVEL, CMD) \ do { \ if (unlikely(libfcoe_debug_logging & LEVEL)) \ do { \ CMD; \ } while (0); \ } while (0) #define LIBFCOE_DBG(fmt, args...) \ LIBFCOE_CHECK_LOGGING(LIBFCOE_LOGGING, \ printk(KERN_INFO "libfcoe: " fmt, ##args);) #define LIBFCOE_FIP_DBG(fip, fmt, args...) \ LIBFCOE_CHECK_LOGGING(LIBFCOE_FIP_LOGGING, \ printk(KERN_INFO "host%d: fip: " fmt, \ (fip)->lp->host->host_no, ##args);) /** * fcoe_ctlr_mtu_valid() - Check if a FCF's MTU is valid * @fcf: The FCF to check * * Return non-zero if FCF fcoe_size has been validated. */ static inline int fcoe_ctlr_mtu_valid(const struct fcoe_fcf *fcf) { return (fcf->flags & FIP_FL_SOL) != 0; } /** * fcoe_ctlr_fcf_usable() - Check if a FCF is usable * @fcf: The FCF to check * * Return non-zero if the FCF is usable. */ static inline int fcoe_ctlr_fcf_usable(struct fcoe_fcf *fcf) { u16 flags = FIP_FL_SOL | FIP_FL_AVAIL; return (fcf->flags & flags) == flags; } /** * fcoe_ctlr_init() - Initialize the FCoE Controller instance * @fip: The FCoE controller to initialize */ void fcoe_ctlr_init(struct fcoe_ctlr *fip) { fip->state = FIP_ST_LINK_WAIT; fip->mode = FIP_ST_AUTO; INIT_LIST_HEAD(&fip->fcfs); spin_lock_init(&fip->lock); fip->flogi_oxid = FC_XID_UNKNOWN; setup_timer(&fip->timer, fcoe_ctlr_timeout, (unsigned long)fip); INIT_WORK(&fip->timer_work, fcoe_ctlr_timer_work); INIT_WORK(&fip->recv_work, fcoe_ctlr_recv_work); skb_queue_head_init(&fip->fip_recv_list); } EXPORT_SYMBOL(fcoe_ctlr_init); /** * fcoe_ctlr_reset_fcfs() - Reset and free all FCFs for a controller * @fip: The FCoE controller whose FCFs are to be reset * * Called with &fcoe_ctlr lock held. */ static void fcoe_ctlr_reset_fcfs(struct fcoe_ctlr *fip) { struct fcoe_fcf *fcf; struct fcoe_fcf *next; fip->sel_fcf = NULL; list_for_each_entry_safe(fcf, next, &fip->fcfs, list) { list_del(&fcf->list); kfree(fcf); } fip->fcf_count = 0; fip->sel_time = 0; } /** * fcoe_ctlr_destroy() - Disable and tear down a FCoE controller * @fip: The FCoE controller to tear down * * This is called by FCoE drivers before freeing the &fcoe_ctlr. * * The receive handler will have been deleted before this to guarantee * that no more recv_work will be scheduled. * * The timer routine will simply return once we set FIP_ST_DISABLED. * This guarantees that no further timeouts or work will be scheduled. */ void fcoe_ctlr_destroy(struct fcoe_ctlr *fip) { cancel_work_sync(&fip->recv_work); skb_queue_purge(&fip->fip_recv_list); spin_lock_bh(&fip->lock); fip->state = FIP_ST_DISABLED; fcoe_ctlr_reset_fcfs(fip); spin_unlock_bh(&fip->lock); del_timer_sync(&fip->timer); cancel_work_sync(&fip->timer_work); } EXPORT_SYMBOL(fcoe_ctlr_destroy); /** * fcoe_ctlr_fcoe_size() - Return the maximum FCoE size required for VN_Port * @fip: The FCoE controller to get the maximum FCoE size from * * Returns the maximum packet size including the FCoE header and trailer, * but not including any Ethernet or VLAN headers. */ static inline u32 fcoe_ctlr_fcoe_size(struct fcoe_ctlr *fip) { /* * Determine the max FCoE frame size allowed, including * FCoE header and trailer. * Note: lp->mfs is currently the payload size, not the frame size. */ return fip->lp->mfs + sizeof(struct fc_frame_header) + sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof); } /** * fcoe_ctlr_solicit() - Send a FIP solicitation * @fip: The FCoE controller to send the solicitation on * @fcf: The destination FCF (if NULL, a multicast solicitation is sent) */ static void fcoe_ctlr_solicit(struct fcoe_ctlr *fip, struct fcoe_fcf *fcf) { struct sk_buff *skb; struct fip_sol { struct ethhdr eth; struct fip_header fip; struct { struct fip_mac_desc mac; struct fip_wwn_desc wwnn; struct fip_size_desc size; } __attribute__((packed)) desc; } __attribute__((packed)) *sol; u32 fcoe_size; skb = dev_alloc_skb(sizeof(*sol)); if (!skb) return; sol = (struct fip_sol *)skb->data; memset(sol, 0, sizeof(*sol)); memcpy(sol->eth.h_dest, fcf ? fcf->fcf_mac : fcoe_all_fcfs, ETH_ALEN); memcpy(sol->eth.h_source, fip->ctl_src_addr, ETH_ALEN); sol->eth.h_proto = htons(ETH_P_FIP); sol->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER); sol->fip.fip_op = htons(FIP_OP_DISC); sol->fip.fip_subcode = FIP_SC_SOL; sol->fip.fip_dl_len = htons(sizeof(sol->desc) / FIP_BPW); sol->fip.fip_flags = htons(FIP_FL_FPMA); if (fip->spma) sol->fip.fip_flags |= htons(FIP_FL_SPMA); sol->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC; sol->desc.mac.fd_desc.fip_dlen = sizeof(sol->desc.mac) / FIP_BPW; memcpy(sol->desc.mac.fd_mac, fip->ctl_src_addr, ETH_ALEN); sol->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME; sol->desc.wwnn.fd_desc.fip_dlen = sizeof(sol->desc.wwnn) / FIP_BPW; put_unaligned_be64(fip->lp->wwnn, &sol->desc.wwnn.fd_wwn); fcoe_size = fcoe_ctlr_fcoe_size(fip); sol->desc.size.fd_desc.fip_dtype = FIP_DT_FCOE_SIZE; sol->desc.size.fd_desc.fip_dlen = sizeof(sol->desc.size) / FIP_BPW; sol->desc.size.fd_size = htons(fcoe_size); skb_put(skb, sizeof(*sol)); skb->protocol = htons(ETH_P_FIP); skb_reset_mac_header(skb); skb_reset_network_header(skb); fip->send(fip, skb); if (!fcf) fip->sol_time = jiffies; } /** * fcoe_ctlr_link_up() - Start FCoE controller * @fip: The FCoE controller to start * * Called from the LLD when the network link is ready. */ void fcoe_ctlr_link_up(struct fcoe_ctlr *fip) { spin_lock_bh(&fip->lock); if (fip->state == FIP_ST_NON_FIP || fip->state == FIP_ST_AUTO) { spin_unlock_bh(&fip->lock); fc_linkup(fip->lp); } else if (fip->state == FIP_ST_LINK_WAIT) { fip->state = fip->mode; spin_unlock_bh(&fip->lock); if (fip->state == FIP_ST_AUTO) LIBFCOE_FIP_DBG(fip, "%s", "setting AUTO mode.\n"); fc_linkup(fip->lp); fcoe_ctlr_solicit(fip, NULL); } else spin_unlock_bh(&fip->lock); } EXPORT_SYMBOL(fcoe_ctlr_link_up); /** * fcoe_ctlr_reset() - Reset a FCoE controller * @fip: The FCoE controller to reset */ static void fcoe_ctlr_reset(struct fcoe_ctlr *fip) { fcoe_ctlr_reset_fcfs(fip); del_timer(&fip->timer); fip->ctlr_ka_time = 0; fip->port_ka_time = 0; fip->sol_time = 0; fip->flogi_oxid = FC_XID_UNKNOWN; fip->map_dest = 0; } /** * fcoe_ctlr_link_down() - Stop a FCoE controller * @fip: The FCoE controller to be stopped * * Returns non-zero if the link was up and now isn't. * * Called from the LLD when the network link is not ready. * There may be multiple calls while the link is down. */ int fcoe_ctlr_link_down(struct fcoe_ctlr *fip) { int link_dropped; LIBFCOE_FIP_DBG(fip, "link down.\n"); spin_lock_bh(&fip->lock); fcoe_ctlr_reset(fip); link_dropped = fip->state != FIP_ST_LINK_WAIT; fip->state = FIP_ST_LINK_WAIT; spin_unlock_bh(&fip->lock); if (link_dropped) fc_linkdown(fip->lp); return link_dropped; } EXPORT_SYMBOL(fcoe_ctlr_link_down); /** * fcoe_ctlr_send_keep_alive() - Send a keep-alive to the selected FCF * @fip: The FCoE controller to send the FKA on * @lport: libfc fc_lport to send from * @ports: 0 for controller keep-alive, 1 for port keep-alive * @sa: The source MAC address * * A controller keep-alive is sent every fka_period (typically 8 seconds). * The source MAC is the native MAC address. * * A port keep-alive is sent every 90 seconds while logged in. * The source MAC is the assigned mapped source address. * The destination is the FCF's F-port. */ static void fcoe_ctlr_send_keep_alive(struct fcoe_ctlr *fip, struct fc_lport *lport, int ports, u8 *sa) { struct sk_buff *skb; struct fip_kal { struct ethhdr eth; struct fip_header fip; struct fip_mac_desc mac; } __attribute__((packed)) *kal; struct fip_vn_desc *vn; u32 len; struct fc_lport *lp; struct fcoe_fcf *fcf; fcf = fip->sel_fcf; lp = fip->lp; if (!fcf || !lp->port_id) return; len = sizeof(*kal) + ports * sizeof(*vn); skb = dev_alloc_skb(len); if (!skb) return; kal = (struct fip_kal *)skb->data; memset(kal, 0, len); memcpy(kal->eth.h_dest, fcf->fcf_mac, ETH_ALEN); memcpy(kal->eth.h_source, sa, ETH_ALEN); kal->eth.h_proto = htons(ETH_P_FIP); kal->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER); kal->fip.fip_op = htons(FIP_OP_CTRL); kal->fip.fip_subcode = FIP_SC_KEEP_ALIVE; kal->fip.fip_dl_len = htons((sizeof(kal->mac) + ports * sizeof(*vn)) / FIP_BPW); kal->fip.fip_flags = htons(FIP_FL_FPMA); if (fip->spma) kal->fip.fip_flags |= htons(FIP_FL_SPMA); kal->mac.fd_desc.fip_dtype = FIP_DT_MAC; kal->mac.fd_desc.fip_dlen = sizeof(kal->mac) / FIP_BPW; memcpy(kal->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN); if (ports) { vn = (struct fip_vn_desc *)(kal + 1); vn->fd_desc.fip_dtype = FIP_DT_VN_ID; vn->fd_desc.fip_dlen = sizeof(*vn) / FIP_BPW; memcpy(vn->fd_mac, fip->get_src_addr(lport), ETH_ALEN); hton24(vn->fd_fc_id, lport->port_id); put_unaligned_be64(lport->wwpn, &vn->fd_wwpn); } skb_put(skb, len); skb->protocol = htons(ETH_P_FIP); skb_reset_mac_header(skb); skb_reset_network_header(skb); fip->send(fip, skb); } /** * fcoe_ctlr_encaps() - Encapsulate an ELS frame for FIP, without sending it * @fip: The FCoE controller for the ELS frame * @dtype: The FIP descriptor type for the frame * @skb: The FCoE ELS frame including FC header but no FCoE headers * * Returns non-zero error code on failure. * * The caller must check that the length is a multiple of 4. * * The @skb must have enough headroom (28 bytes) and tailroom (8 bytes). * Headroom includes the FIP encapsulation description, FIP header, and * Ethernet header. The tailroom is for the FIP MAC descriptor. */ static int fcoe_ctlr_encaps(struct fcoe_ctlr *fip, struct fc_lport *lport, u8 dtype, struct sk_buff *skb) { struct fip_encaps_head { struct ethhdr eth; struct fip_header fip; struct fip_encaps encaps; } __attribute__((packed)) *cap; struct fip_mac_desc *mac; struct fcoe_fcf *fcf; size_t dlen; u16 fip_flags; fcf = fip->sel_fcf; if (!fcf) return -ENODEV; /* set flags according to both FCF and lport's capability on SPMA */ fip_flags = fcf->flags; fip_flags &= fip->spma ? FIP_FL_SPMA | FIP_FL_FPMA : FIP_FL_FPMA; if (!fip_flags) return -ENODEV; dlen = sizeof(struct fip_encaps) + skb->len; /* len before push */ cap = (struct fip_encaps_head *)skb_push(skb, sizeof(*cap)); memset(cap, 0, sizeof(*cap)); memcpy(cap->eth.h_dest, fcf->fcf_mac, ETH_ALEN); memcpy(cap->eth.h_source, fip->ctl_src_addr, ETH_ALEN); cap->eth.h_proto = htons(ETH_P_FIP); cap->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER); cap->fip.fip_op = htons(FIP_OP_LS); cap->fip.fip_subcode = FIP_SC_REQ; cap->fip.fip_dl_len = htons((dlen + sizeof(*mac)) / FIP_BPW); cap->fip.fip_flags = htons(fip_flags); cap->encaps.fd_desc.fip_dtype = dtype; cap->encaps.fd_desc.fip_dlen = dlen / FIP_BPW; mac = (struct fip_mac_desc *)skb_put(skb, sizeof(*mac)); memset(mac, 0, sizeof(*mac)); mac->fd_desc.fip_dtype = FIP_DT_MAC; mac->fd_desc.fip_dlen = sizeof(*mac) / FIP_BPW; if (dtype != FIP_DT_FLOGI && dtype != FIP_DT_FDISC) { memcpy(mac->fd_mac, fip->get_src_addr(lport), ETH_ALEN); } else if (fip_flags & FIP_FL_SPMA) { LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with SPMA\n"); memcpy(mac->fd_mac, fip->ctl_src_addr, ETH_ALEN); } else { LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with FPMA\n"); /* FPMA only FLOGI must leave the MAC desc set to all 0s */ } skb->protocol = htons(ETH_P_FIP); skb_reset_mac_header(skb); skb_reset_network_header(skb); return 0; } /** * fcoe_ctlr_els_send() - Send an ELS frame encapsulated by FIP if appropriate. * @fip: FCoE controller. * @lport: libfc fc_lport to send from * @skb: FCoE ELS frame including FC header but no FCoE headers. * * Returns a non-zero error code if the frame should not be sent. * Returns zero if the caller should send the frame with FCoE encapsulation. * * The caller must check that the length is a multiple of 4. * The SKB must have enough headroom (28 bytes) and tailroom (8 bytes). */ int fcoe_ctlr_els_send(struct fcoe_ctlr *fip, struct fc_lport *lport, struct sk_buff *skb) { struct fc_frame_header *fh; u16 old_xid; u8 op; u8 mac[ETH_ALEN]; fh = (struct fc_frame_header *)skb->data; op = *(u8 *)(fh + 1); if (op == ELS_FLOGI) { old_xid = fip->flogi_oxid; fip->flogi_oxid = ntohs(fh->fh_ox_id); if (fip->state == FIP_ST_AUTO) { if (old_xid == FC_XID_UNKNOWN) fip->flogi_count = 0; fip->flogi_count++; if (fip->flogi_count < 3) goto drop; fip->map_dest = 1; return 0; } if (fip->state == FIP_ST_NON_FIP) fip->map_dest = 1; } if (fip->state == FIP_ST_NON_FIP) return 0; if (!fip->sel_fcf) goto drop; switch (op) { case ELS_FLOGI: op = FIP_DT_FLOGI; break; case ELS_FDISC: if (ntoh24(fh->fh_s_id)) return 0; op = FIP_DT_FDISC; break; case ELS_LOGO: if (fip->state != FIP_ST_ENABLED) return 0; if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI) return 0; op = FIP_DT_LOGO; break; case ELS_LS_ACC: if (fip->flogi_oxid == FC_XID_UNKNOWN) return 0; if (!ntoh24(fh->fh_s_id)) return 0; if (fip->state == FIP_ST_AUTO) return 0; /* * Here we must've gotten an SID by accepting an FLOGI * from a point-to-point connection. Switch to using * the source mac based on the SID. The destination * MAC in this case would have been set by receving the * FLOGI. */ fip->flogi_oxid = FC_XID_UNKNOWN; fc_fcoe_set_mac(mac, fh->fh_d_id); fip->update_mac(lport, mac); return 0; default: if (fip->state != FIP_ST_ENABLED) goto drop; return 0; } if (fcoe_ctlr_encaps(fip, lport, op, skb)) goto drop; fip->send(fip, skb); return -EINPROGRESS; drop: kfree_skb(skb); return -EINVAL; } EXPORT_SYMBOL(fcoe_ctlr_els_send); /** * fcoe_ctlr_age_fcfs() - Reset and free all old FCFs for a controller * @fip: The FCoE controller to free FCFs on * * Called with lock held and preemption disabled. * * An FCF is considered old if we have missed three advertisements. * That is, there have been no valid advertisement from it for three * times its keep-alive period including fuzz. * * In addition, determine the time when an FCF selection can occur. * * Also, increment the MissDiscAdvCount when no advertisement is received * for the corresponding FCF for 1.5 * FKA_ADV_PERIOD (FC-BB-5 LESB). */ static void fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip) { struct fcoe_fcf *fcf; struct fcoe_fcf *next; unsigned long sel_time = 0; unsigned long mda_time = 0; struct fcoe_dev_stats *stats; list_for_each_entry_safe(fcf, next, &fip->fcfs, list) { mda_time = fcf->fka_period + (fcf->fka_period >> 1); if ((fip->sel_fcf == fcf) && (time_after(jiffies, fcf->time + mda_time))) { mod_timer(&fip->timer, jiffies + mda_time); stats = per_cpu_ptr(fip->lp->dev_stats, smp_processor_id()); stats->MissDiscAdvCount++; printk(KERN_INFO "libfcoe: host%d: Missing Discovery " "Advertisement for fab %16.16llx count %lld\n", fip->lp->host->host_no, fcf->fabric_name, stats->MissDiscAdvCount); } if (time_after(jiffies, fcf->time + fcf->fka_period * 3 + msecs_to_jiffies(FIP_FCF_FUZZ * 3))) { if (fip->sel_fcf == fcf) fip->sel_fcf = NULL; list_del(&fcf->list); WARN_ON(!fip->fcf_count); fip->fcf_count--; kfree(fcf); stats = per_cpu_ptr(fip->lp->dev_stats, smp_processor_id()); stats->VLinkFailureCount++; } else if (fcoe_ctlr_mtu_valid(fcf) && (!sel_time || time_before(sel_time, fcf->time))) { sel_time = fcf->time; } } if (sel_time) { sel_time += msecs_to_jiffies(FCOE_CTLR_START_DELAY); fip->sel_time = sel_time; if (time_before(sel_time, fip->timer.expires)) mod_timer(&fip->timer, sel_time); } else { fip->sel_time = 0; } } /** * fcoe_ctlr_parse_adv() - Decode a FIP advertisement into a new FCF entry * @fip: The FCoE controller receiving the advertisement * @skb: The received FIP advertisement frame * @fcf: The resulting FCF entry * * Returns zero on a valid parsed advertisement, * otherwise returns non zero value. */ static int fcoe_ctlr_parse_adv(struct fcoe_ctlr *fip, struct sk_buff *skb, struct fcoe_fcf *fcf) { struct fip_header *fiph; struct fip_desc *desc = NULL; struct fip_wwn_desc *wwn; struct fip_fab_desc *fab; struct fip_fka_desc *fka; unsigned long t; size_t rlen; size_t dlen; memset(fcf, 0, sizeof(*fcf)); fcf->fka_period = msecs_to_jiffies(FCOE_CTLR_DEF_FKA); fiph = (struct fip_header *)skb->data; fcf->flags = ntohs(fiph->fip_flags); rlen = ntohs(fiph->fip_dl_len) * 4; if (rlen + sizeof(*fiph) > skb->len) return -EINVAL; desc = (struct fip_desc *)(fiph + 1); while (rlen > 0) { dlen = desc->fip_dlen * FIP_BPW; if (dlen < sizeof(*desc) || dlen > rlen) return -EINVAL; switch (desc->fip_dtype) { case FIP_DT_PRI: if (dlen != sizeof(struct fip_pri_desc)) goto len_err; fcf->pri = ((struct fip_pri_desc *)desc)->fd_pri; break; case FIP_DT_MAC: if (dlen != sizeof(struct fip_mac_desc)) goto len_err; memcpy(fcf->fcf_mac, ((struct fip_mac_desc *)desc)->fd_mac, ETH_ALEN); if (!is_valid_ether_addr(fcf->fcf_mac)) { LIBFCOE_FIP_DBG(fip, "Invalid MAC address " "in FIP adv\n"); return -EINVAL; } break; case FIP_DT_NAME: if (dlen != sizeof(struct fip_wwn_desc)) goto len_err; wwn = (struct fip_wwn_desc *)desc; fcf->switch_name = get_unaligned_be64(&wwn->fd_wwn); break; case FIP_DT_FAB: if (dlen != sizeof(struct fip_fab_desc)) goto len_err; fab = (struct fip_fab_desc *)desc; fcf->fabric_name = get_unaligned_be64(&fab->fd_wwn); fcf->vfid = ntohs(fab->fd_vfid); fcf->fc_map = ntoh24(fab->fd_map); break; case FIP_DT_FKA: if (dlen != sizeof(struct fip_fka_desc)) goto len_err; fka = (struct fip_fka_desc *)desc; if (fka->fd_flags & FIP_FKA_ADV_D) fcf->fd_flags = 1; t = ntohl(fka->fd_fka_period); if (t >= FCOE_CTLR_MIN_FKA) fcf->fka_period = msecs_to_jiffies(t); break; case FIP_DT_MAP_OUI: case FIP_DT_FCOE_SIZE: case FIP_DT_FLOGI: case FIP_DT_FDISC: case FIP_DT_LOGO: case FIP_DT_ELP: default: LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x " "in FIP adv\n", desc->fip_dtype); /* standard says ignore unknown descriptors >= 128 */ if (desc->fip_dtype < FIP_DT_VENDOR_BASE) return -EINVAL; continue; } desc = (struct fip_desc *)((char *)desc + dlen); rlen -= dlen; } if (!fcf->fc_map || (fcf->fc_map & 0x10000)) return -EINVAL; if (!fcf->switch_name || !fcf->fabric_name) return -EINVAL; return 0; len_err: LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n", desc->fip_dtype, dlen); return -EINVAL; } /** * fcoe_ctlr_recv_adv() - Handle an incoming advertisement * @fip: The FCoE controller receiving the advertisement * @skb: The received FIP packet */ static void fcoe_ctlr_recv_adv(struct fcoe_ctlr *fip, struct sk_buff *skb) { struct fcoe_fcf *fcf; struct fcoe_fcf new; struct fcoe_fcf *found; unsigned long sol_tov = msecs_to_jiffies(FCOE_CTRL_SOL_TOV); int first = 0; int mtu_valid; if (fcoe_ctlr_parse_adv(fip, skb, &new)) return; spin_lock_bh(&fip->lock); first = list_empty(&fip->fcfs); found = NULL; list_for_each_entry(fcf, &fip->fcfs, list) { if (fcf->switch_name == new.switch_name && fcf->fabric_name == new.fabric_name && fcf->fc_map == new.fc_map && compare_ether_addr(fcf->fcf_mac, new.fcf_mac) == 0) { found = fcf; break; } } if (!found) { if (fip->fcf_count >= FCOE_CTLR_FCF_LIMIT) goto out; fcf = kmalloc(sizeof(*fcf), GFP_ATOMIC); if (!fcf) goto out; fip->fcf_count++; memcpy(fcf, &new, sizeof(new)); list_add(&fcf->list, &fip->fcfs); } else { /* * Flags in advertisements are ignored once the FCF is * selected. Flags in unsolicited advertisements are * ignored after a usable solicited advertisement * has been received. */ if (fcf == fip->sel_fcf) { fip->ctlr_ka_time -= fcf->fka_period; fip->ctlr_ka_time += new.fka_period; if (time_before(fip->ctlr_ka_time, fip->timer.expires)) mod_timer(&fip->timer, fip->ctlr_ka_time); } else if (!fcoe_ctlr_fcf_usable(fcf)) fcf->flags = new.flags; fcf->fka_period = new.fka_period; memcpy(fcf->fcf_mac, new.fcf_mac, ETH_ALEN); } mtu_valid = fcoe_ctlr_mtu_valid(fcf); fcf->time = jiffies; if (!found) { LIBFCOE_FIP_DBG(fip, "New FCF for fab %16.16llx " "map %x val %d\n", fcf->fabric_name, fcf->fc_map, mtu_valid); } /* * If this advertisement is not solicited and our max receive size * hasn't been verified, send a solicited advertisement. */ if (!mtu_valid) fcoe_ctlr_solicit(fip, fcf); /* * If its been a while since we did a solicit, and this is * the first advertisement we've received, do a multicast * solicitation to gather as many advertisements as we can * before selection occurs. */ if (first && time_after(jiffies, fip->sol_time + sol_tov)) fcoe_ctlr_solicit(fip, NULL); /* * If this is the first validated FCF, note the time and * set a timer to trigger selection. */ if (mtu_valid && !fip->sel_time && fcoe_ctlr_fcf_usable(fcf)) { fip->sel_time = jiffies + msecs_to_jiffies(FCOE_CTLR_START_DELAY); if (!timer_pending(&fip->timer) || time_before(fip->sel_time, fip->timer.expires)) mod_timer(&fip->timer, fip->sel_time); } out: spin_unlock_bh(&fip->lock); } /** * fcoe_ctlr_recv_els() - Handle an incoming FIP encapsulated ELS frame * @fip: The FCoE controller which received the packet * @skb: The received FIP packet */ static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb) { struct fc_lport *lport = fip->lp; struct fip_header *fiph; struct fc_frame *fp = (struct fc_frame *)skb; struct fc_frame_header *fh = NULL; struct fip_desc *desc; struct fip_encaps *els; struct fcoe_dev_stats *stats; enum fip_desc_type els_dtype = 0; u8 els_op; u8 sub; u8 granted_mac[ETH_ALEN] = { 0 }; size_t els_len = 0; size_t rlen; size_t dlen; fiph = (struct fip_header *)skb->data; sub = fiph->fip_subcode; if (sub != FIP_SC_REQ && sub != FIP_SC_REP) goto drop; rlen = ntohs(fiph->fip_dl_len) * 4; if (rlen + sizeof(*fiph) > skb->len) goto drop; desc = (struct fip_desc *)(fiph + 1); while (rlen > 0) { dlen = desc->fip_dlen * FIP_BPW; if (dlen < sizeof(*desc) || dlen > rlen) goto drop; switch (desc->fip_dtype) { case FIP_DT_MAC: if (dlen != sizeof(struct fip_mac_desc)) goto len_err; memcpy(granted_mac, ((struct fip_mac_desc *)desc)->fd_mac, ETH_ALEN); if (!is_valid_ether_addr(granted_mac)) { LIBFCOE_FIP_DBG(fip, "Invalid MAC address " "in FIP ELS\n"); goto drop; } memcpy(fr_cb(fp)->granted_mac, granted_mac, ETH_ALEN); break; case FIP_DT_FLOGI: case FIP_DT_FDISC: case FIP_DT_LOGO: case FIP_DT_ELP: if (fh) goto drop; if (dlen < sizeof(*els) + sizeof(*fh) + 1) goto len_err; els_len = dlen - sizeof(*els); els = (struct fip_encaps *)desc; fh = (struct fc_frame_header *)(els + 1); els_dtype = desc->fip_dtype; break; default: LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x " "in FIP adv\n", desc->fip_dtype); /* standard says ignore unknown descriptors >= 128 */ if (desc->fip_dtype < FIP_DT_VENDOR_BASE) goto drop; continue; } desc = (struct fip_desc *)((char *)desc + dlen); rlen -= dlen; } if (!fh) goto drop; els_op = *(u8 *)(fh + 1); if (els_dtype == FIP_DT_FLOGI && sub == FIP_SC_REP && fip->flogi_oxid == ntohs(fh->fh_ox_id) && els_op == ELS_LS_ACC && is_valid_ether_addr(granted_mac)) fip->flogi_oxid = FC_XID_UNKNOWN; /* * Convert skb into an fc_frame containing only the ELS. */ skb_pull(skb, (u8 *)fh - skb->data); skb_trim(skb, els_len); fp = (struct fc_frame *)skb; fc_frame_init(fp); fr_sof(fp) = FC_SOF_I3; fr_eof(fp) = FC_EOF_T; fr_dev(fp) = lport; stats = per_cpu_ptr(lport->dev_stats, get_cpu()); stats->RxFrames++; stats->RxWords += skb->len / FIP_BPW; put_cpu(); fc_exch_recv(lport, fp); return; len_err: LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n", desc->fip_dtype, dlen); drop: kfree_skb(skb); } /** * fcoe_ctlr_recv_els() - Handle an incoming link reset frame * @fip: The FCoE controller that received the frame * @fh: The received FIP header * * There may be multiple VN_Port descriptors. * The overall length has already been checked. */ static void fcoe_ctlr_recv_clr_vlink(struct fcoe_ctlr *fip, struct fip_header *fh) { struct fip_desc *desc; struct fip_mac_desc *mp; struct fip_wwn_desc *wp; struct fip_vn_desc *vp; size_t rlen; size_t dlen; struct fcoe_fcf *fcf = fip->sel_fcf; struct fc_lport *lport = fip->lp; u32 desc_mask; LIBFCOE_FIP_DBG(fip, "Clear Virtual Link received\n"); if (!fcf || !lport->port_id) return; /* * mask of required descriptors. Validating each one clears its bit. */ desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) | BIT(FIP_DT_VN_ID); rlen = ntohs(fh->fip_dl_len) * FIP_BPW; desc = (struct fip_desc *)(fh + 1); while (rlen >= sizeof(*desc)) { dlen = desc->fip_dlen * FIP_BPW; if (dlen > rlen) return; switch (desc->fip_dtype) { case FIP_DT_MAC: mp = (struct fip_mac_desc *)desc; if (dlen < sizeof(*mp)) return; if (compare_ether_addr(mp->fd_mac, fcf->fcf_mac)) return; desc_mask &= ~BIT(FIP_DT_MAC); break; case FIP_DT_NAME: wp = (struct fip_wwn_desc *)desc; if (dlen < sizeof(*wp)) return; if (get_unaligned_be64(&wp->fd_wwn) != fcf->switch_name) return; desc_mask &= ~BIT(FIP_DT_NAME); break; case FIP_DT_VN_ID: vp = (struct fip_vn_desc *)desc; if (dlen < sizeof(*vp)) return; if (compare_ether_addr(vp->fd_mac, fip->get_src_addr(lport)) == 0 && get_unaligned_be64(&vp->fd_wwpn) == lport->wwpn && ntoh24(vp->fd_fc_id) == lport->port_id) desc_mask &= ~BIT(FIP_DT_VN_ID); break; default: /* standard says ignore unknown descriptors >= 128 */ if (desc->fip_dtype < FIP_DT_VENDOR_BASE) return; break; } desc = (struct fip_desc *)((char *)desc + dlen); rlen -= dlen; } /* * reset only if all required descriptors were present and valid. */ if (desc_mask) { LIBFCOE_FIP_DBG(fip, "missing descriptors mask %x\n", desc_mask); } else { LIBFCOE_FIP_DBG(fip, "performing Clear Virtual Link\n"); spin_lock_bh(&fip->lock); per_cpu_ptr(lport->dev_stats, smp_processor_id())->VLinkFailureCount++; fcoe_ctlr_reset(fip); spin_unlock_bh(&fip->lock); fc_lport_reset(fip->lp); fcoe_ctlr_solicit(fip, NULL); } } /** * fcoe_ctlr_recv() - Receive a FIP packet * @fip: The FCoE controller that received the packet * @skb: The received FIP packet * * This may be called from either NET_RX_SOFTIRQ or IRQ. */ void fcoe_ctlr_recv(struct fcoe_ctlr *fip, struct sk_buff *skb) { skb_queue_tail(&fip->fip_recv_list, skb); schedule_work(&fip->recv_work); } EXPORT_SYMBOL(fcoe_ctlr_recv); /** * fcoe_ctlr_recv_handler() - Receive a FIP frame * @fip: The FCoE controller that received the frame * @skb: The received FIP frame * * Returns non-zero if the frame is dropped. */ static int fcoe_ctlr_recv_handler(struct fcoe_ctlr *fip, struct sk_buff *skb) { struct fip_header *fiph; struct ethhdr *eh; enum fip_state state; u16 op; u8 sub; if (skb_linearize(skb)) goto drop; if (skb->len < sizeof(*fiph)) goto drop; eh = eth_hdr(skb); if (compare_ether_addr(eh->h_dest, fip->ctl_src_addr) && compare_ether_addr(eh->h_dest, FIP_ALL_ENODE_MACS)) goto drop; fiph = (struct fip_header *)skb->data; op = ntohs(fiph->fip_op); sub = fiph->fip_subcode; if (FIP_VER_DECAPS(fiph->fip_ver) != FIP_VER) goto drop; if (ntohs(fiph->fip_dl_len) * FIP_BPW + sizeof(*fiph) > skb->len) goto drop; spin_lock_bh(&fip->lock); state = fip->state; if (state == FIP_ST_AUTO) { fip->map_dest = 0; fip->state = FIP_ST_ENABLED; state = FIP_ST_ENABLED; LIBFCOE_FIP_DBG(fip, "Using FIP mode\n"); } spin_unlock_bh(&fip->lock); if (state != FIP_ST_ENABLED) goto drop; if (op == FIP_OP_LS) { fcoe_ctlr_recv_els(fip, skb); /* consumes skb */ return 0; } if (op == FIP_OP_DISC && sub == FIP_SC_ADV) fcoe_ctlr_recv_adv(fip, skb); else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK) fcoe_ctlr_recv_clr_vlink(fip, fiph); kfree_skb(skb); return 0; drop: kfree_skb(skb); return -1; } /** * fcoe_ctlr_select() - Select the best FCF (if possible) * @fip: The FCoE controller * * If there are conflicting advertisements, no FCF can be chosen. * * Called with lock held. */ static void fcoe_ctlr_select(struct fcoe_ctlr *fip) { struct fcoe_fcf *fcf; struct fcoe_fcf *best = NULL; list_for_each_entry(fcf, &fip->fcfs, list) { LIBFCOE_FIP_DBG(fip, "consider FCF for fab %16.16llx " "VFID %d map %x val %d\n", fcf->fabric_name, fcf->vfid, fcf->fc_map, fcoe_ctlr_mtu_valid(fcf)); if (!fcoe_ctlr_fcf_usable(fcf)) { LIBFCOE_FIP_DBG(fip, "FCF for fab %16.16llx " "map %x %svalid %savailable\n", fcf->fabric_name, fcf->fc_map, (fcf->flags & FIP_FL_SOL) ? "" : "in", (fcf->flags & FIP_FL_AVAIL) ? "" : "un"); continue; } if (!best) { best = fcf; continue; } if (fcf->fabric_name != best->fabric_name || fcf->vfid != best->vfid || fcf->fc_map != best->fc_map) { LIBFCOE_FIP_DBG(fip, "Conflicting fabric, VFID, " "or FC-MAP\n"); return; } if (fcf->pri < best->pri) best = fcf; } fip->sel_fcf = best; } /** * fcoe_ctlr_timeout() - FIP timeout handler * @arg: The FCoE controller that timed out * * Ages FCFs. Triggers FCF selection if possible. Sends keep-alives. */ static void fcoe_ctlr_timeout(unsigned long arg) { struct fcoe_ctlr *fip = (struct fcoe_ctlr *)arg; struct fcoe_fcf *sel; struct fcoe_fcf *fcf; unsigned long next_timer = jiffies + msecs_to_jiffies(FIP_VN_KA_PERIOD); spin_lock_bh(&fip->lock); if (fip->state == FIP_ST_DISABLED) { spin_unlock_bh(&fip->lock); return; } fcf = fip->sel_fcf; fcoe_ctlr_age_fcfs(fip); sel = fip->sel_fcf; if (!sel && fip->sel_time && time_after_eq(jiffies, fip->sel_time)) { fcoe_ctlr_select(fip); sel = fip->sel_fcf; fip->sel_time = 0; } if (sel != fcf) { fcf = sel; /* the old FCF may have been freed */ if (sel) { printk(KERN_INFO "libfcoe: host%d: FIP selected " "Fibre-Channel Forwarder MAC %pM\n", fip->lp->host->host_no, sel->fcf_mac); memcpy(fip->dest_addr, sel->fcf_mac, ETH_ALEN); fip->port_ka_time = jiffies + msecs_to_jiffies(FIP_VN_KA_PERIOD); fip->ctlr_ka_time = jiffies + sel->fka_period; } else { printk(KERN_NOTICE "libfcoe: host%d: " "FIP Fibre-Channel Forwarder timed out. " "Starting FCF discovery.\n", fip->lp->host->host_no); fip->reset_req = 1; schedule_work(&fip->timer_work); } } if (sel && !sel->fd_flags) { if (time_after_eq(jiffies, fip->ctlr_ka_time)) { fip->ctlr_ka_time = jiffies + sel->fka_period; fip->send_ctlr_ka = 1; } if (time_after(next_timer, fip->ctlr_ka_time)) next_timer = fip->ctlr_ka_time; if (time_after_eq(jiffies, fip->port_ka_time)) { fip->port_ka_time = jiffies + msecs_to_jiffies(FIP_VN_KA_PERIOD); fip->send_port_ka = 1; } if (time_after(next_timer, fip->port_ka_time)) next_timer = fip->port_ka_time; mod_timer(&fip->timer, next_timer); } else if (fip->sel_time) { next_timer = fip->sel_time + msecs_to_jiffies(FCOE_CTLR_START_DELAY); mod_timer(&fip->timer, next_timer); } if (fip->send_ctlr_ka || fip->send_port_ka) schedule_work(&fip->timer_work); spin_unlock_bh(&fip->lock); } /** * fcoe_ctlr_timer_work() - Worker thread function for timer work * @work: Handle to a FCoE controller * * Sends keep-alives and resets which must not * be called from the timer directly, since they use a mutex. */ static void fcoe_ctlr_timer_work(struct work_struct *work) { struct fcoe_ctlr *fip; struct fc_lport *vport; u8 *mac; int reset; fip = container_of(work, struct fcoe_ctlr, timer_work); spin_lock_bh(&fip->lock); reset = fip->reset_req; fip->reset_req = 0; spin_unlock_bh(&fip->lock); if (reset) fc_lport_reset(fip->lp); if (fip->send_ctlr_ka) { fip->send_ctlr_ka = 0; fcoe_ctlr_send_keep_alive(fip, NULL, 0, fip->ctl_src_addr); } if (fip->send_port_ka) { fip->send_port_ka = 0; mutex_lock(&fip->lp->lp_mutex); mac = fip->get_src_addr(fip->lp); fcoe_ctlr_send_keep_alive(fip, fip->lp, 1, mac); list_for_each_entry(vport, &fip->lp->vports, list) { mac = fip->get_src_addr(vport); fcoe_ctlr_send_keep_alive(fip, vport, 1, mac); } mutex_unlock(&fip->lp->lp_mutex); } } /** * fcoe_ctlr_recv_work() - Worker thread function for receiving FIP frames * @recv_work: Handle to a FCoE controller */ static void fcoe_ctlr_recv_work(struct work_struct *recv_work) { struct fcoe_ctlr *fip; struct sk_buff *skb; fip = container_of(recv_work, struct fcoe_ctlr, recv_work); while ((skb = skb_dequeue(&fip->fip_recv_list))) fcoe_ctlr_recv_handler(fip, skb); } /** * fcoe_ctlr_recv_flogi() - Snoop pre-FIP receipt of FLOGI response * @fip: The FCoE controller * @fp: The FC frame to snoop * * Snoop potential response to FLOGI or even incoming FLOGI. * * The caller has checked that we are waiting for login as indicated * by fip->flogi_oxid != FC_XID_UNKNOWN. * * The caller is responsible for freeing the frame. * Fill in the granted_mac address. * * Return non-zero if the frame should not be delivered to libfc. */ int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *fip, struct fc_lport *lport, struct fc_frame *fp) { struct fc_frame_header *fh; u8 op; u8 *sa; sa = eth_hdr(&fp->skb)->h_source; fh = fc_frame_header_get(fp); if (fh->fh_type != FC_TYPE_ELS) return 0; op = fc_frame_payload_op(fp); if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP && fip->flogi_oxid == ntohs(fh->fh_ox_id)) { spin_lock_bh(&fip->lock); if (fip->state != FIP_ST_AUTO && fip->state != FIP_ST_NON_FIP) { spin_unlock_bh(&fip->lock); return -EINVAL; } fip->state = FIP_ST_NON_FIP; LIBFCOE_FIP_DBG(fip, "received FLOGI LS_ACC using non-FIP mode\n"); /* * FLOGI accepted. * If the src mac addr is FC_OUI-based, then we mark the * address_mode flag to use FC_OUI-based Ethernet DA. * Otherwise we use the FCoE gateway addr */ if (!compare_ether_addr(sa, (u8[6])FC_FCOE_FLOGI_MAC)) { fip->map_dest = 1; } else { memcpy(fip->dest_addr, sa, ETH_ALEN); fip->map_dest = 0; } fip->flogi_oxid = FC_XID_UNKNOWN; spin_unlock_bh(&fip->lock); fc_fcoe_set_mac(fr_cb(fp)->granted_mac, fh->fh_d_id); } else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) { /* * Save source MAC for point-to-point responses. */ spin_lock_bh(&fip->lock); if (fip->state == FIP_ST_AUTO || fip->state == FIP_ST_NON_FIP) { memcpy(fip->dest_addr, sa, ETH_ALEN); fip->map_dest = 0; if (fip->state == FIP_ST_AUTO) LIBFCOE_FIP_DBG(fip, "received non-FIP FLOGI. " "Setting non-FIP mode\n"); fip->state = FIP_ST_NON_FIP; } spin_unlock_bh(&fip->lock); } return 0; } EXPORT_SYMBOL(fcoe_ctlr_recv_flogi); /** * fcoe_wwn_from_mac() - Converts a 48-bit IEEE MAC address to a 64-bit FC WWN * @mac: The MAC address to convert * @scheme: The scheme to use when converting * @port: The port indicator for converting * * Returns: u64 fc world wide name */ u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN], unsigned int scheme, unsigned int port) { u64 wwn; u64 host_mac; /* The MAC is in NO, so flip only the low 48 bits */ host_mac = ((u64) mac[0] << 40) | ((u64) mac[1] << 32) | ((u64) mac[2] << 24) | ((u64) mac[3] << 16) | ((u64) mac[4] << 8) | (u64) mac[5]; WARN_ON(host_mac >= (1ULL << 48)); wwn = host_mac | ((u64) scheme << 60); switch (scheme) { case 1: WARN_ON(port != 0); break; case 2: WARN_ON(port >= 0xfff); wwn |= (u64) port << 48; break; default: WARN_ON(1); break; } return wwn; } EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac); /** * fcoe_libfc_config() - Sets up libfc related properties for local port * @lp: The local port to configure libfc for * @tt: The libfc function template * * Returns : 0 for success */ int fcoe_libfc_config(struct fc_lport *lport, struct libfc_function_template *tt) { /* Set the function pointers set by the LLDD */ memcpy(&lport->tt, tt, sizeof(*tt)); if (fc_fcp_init(lport)) return -ENOMEM; fc_exch_init(lport); fc_elsct_init(lport); fc_lport_init(lport); fc_rport_init(lport); fc_disc_init(lport); return 0; } EXPORT_SYMBOL_GPL(fcoe_libfc_config);