diff options
Diffstat (limited to 'drivers/scsi/fcoe/fcoe_ctlr.c')
| -rw-r--r-- | drivers/scsi/fcoe/fcoe_ctlr.c | 3258 |
1 files changed, 3258 insertions, 0 deletions
diff --git a/drivers/scsi/fcoe/fcoe_ctlr.c b/drivers/scsi/fcoe/fcoe_ctlr.c new file mode 100644 index 000000000..8a4124e7d --- /dev/null +++ b/drivers/scsi/fcoe/fcoe_ctlr.c @@ -0,0 +1,3258 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2008-2009 Cisco Systems, Inc. All rights reserved. + * Copyright (c) 2009 Intel Corporation. All rights reserved. + * + * Maintained at www.Open-FCoE.org + */ + +#include <linux/types.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/spinlock.h> +#include <linux/timer.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/ethtool.h> +#include <linux/if_ether.h> +#include <linux/if_vlan.h> +#include <linux/errno.h> +#include <linux/bitops.h> +#include <linux/slab.h> +#include <net/rtnetlink.h> + +#include <scsi/fc/fc_els.h> +#include <scsi/fc/fc_fs.h> +#include <scsi/fc/fc_fip.h> +#include <scsi/fc/fc_encaps.h> +#include <scsi/fc/fc_fcoe.h> +#include <scsi/fc/fc_fcp.h> + +#include <scsi/libfc.h> +#include <scsi/libfcoe.h> + +#include "libfcoe.h" + +#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(struct timer_list *); +static void fcoe_ctlr_timer_work(struct work_struct *); +static void fcoe_ctlr_recv_work(struct work_struct *); +static int fcoe_ctlr_flogi_retry(struct fcoe_ctlr *); + +static void fcoe_ctlr_vn_start(struct fcoe_ctlr *); +static int fcoe_ctlr_vn_recv(struct fcoe_ctlr *, struct sk_buff *); +static void fcoe_ctlr_vn_timeout(struct fcoe_ctlr *); +static int fcoe_ctlr_vn_lookup(struct fcoe_ctlr *, u32, u8 *); + +static int fcoe_ctlr_vlan_recv(struct fcoe_ctlr *, struct sk_buff *); + +static u8 fcoe_all_fcfs[ETH_ALEN] = FIP_ALL_FCF_MACS; +static u8 fcoe_all_enode[ETH_ALEN] = FIP_ALL_ENODE_MACS; +static u8 fcoe_all_vn2vn[ETH_ALEN] = FIP_ALL_VN2VN_MACS; +static u8 fcoe_all_p2p[ETH_ALEN] = FIP_ALL_P2P_MACS; + +static const char * const fcoe_ctlr_states[] = { + [FIP_ST_DISABLED] = "DISABLED", + [FIP_ST_LINK_WAIT] = "LINK_WAIT", + [FIP_ST_AUTO] = "AUTO", + [FIP_ST_NON_FIP] = "NON_FIP", + [FIP_ST_ENABLED] = "ENABLED", + [FIP_ST_VNMP_START] = "VNMP_START", + [FIP_ST_VNMP_PROBE1] = "VNMP_PROBE1", + [FIP_ST_VNMP_PROBE2] = "VNMP_PROBE2", + [FIP_ST_VNMP_CLAIM] = "VNMP_CLAIM", + [FIP_ST_VNMP_UP] = "VNMP_UP", +}; + +static const char *fcoe_ctlr_state(enum fip_state state) +{ + const char *cp = "unknown"; + + if (state < ARRAY_SIZE(fcoe_ctlr_states)) + cp = fcoe_ctlr_states[state]; + if (!cp) + cp = "unknown"; + return cp; +} + +/** + * fcoe_ctlr_set_state() - Set and do debug printing for the new FIP state. + * @fip: The FCoE controller + * @state: The new state + */ +static void fcoe_ctlr_set_state(struct fcoe_ctlr *fip, enum fip_state state) +{ + if (state == fip->state) + return; + if (fip->lp) + LIBFCOE_FIP_DBG(fip, "state %s -> %s\n", + fcoe_ctlr_state(fip->state), fcoe_ctlr_state(state)); + fip->state = state; +} + +/** + * 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_map_dest() - Set flag and OUI for mapping destination addresses + * @fip: The FCoE controller + */ +static void fcoe_ctlr_map_dest(struct fcoe_ctlr *fip) +{ + if (fip->mode == FIP_MODE_VN2VN) + hton24(fip->dest_addr, FIP_VN_FC_MAP); + else + hton24(fip->dest_addr, FIP_DEF_FC_MAP); + hton24(fip->dest_addr + 3, 0); + fip->map_dest = 1; +} + +/** + * fcoe_ctlr_init() - Initialize the FCoE Controller instance + * @fip: The FCoE controller to initialize + * @mode: FIP mode to set + */ +void fcoe_ctlr_init(struct fcoe_ctlr *fip, enum fip_mode mode) +{ + fcoe_ctlr_set_state(fip, FIP_ST_LINK_WAIT); + fip->mode = mode; + fip->fip_resp = false; + INIT_LIST_HEAD(&fip->fcfs); + mutex_init(&fip->ctlr_mutex); + spin_lock_init(&fip->ctlr_lock); + fip->flogi_oxid = FC_XID_UNKNOWN; + timer_setup(&fip->timer, fcoe_ctlr_timeout, 0); + 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_sysfs_fcf_add() - Add a fcoe_fcf{,_device} to a fcoe_ctlr{,_device} + * @new: The newly discovered FCF + * + * Called with fip->ctlr_mutex held + */ +static int fcoe_sysfs_fcf_add(struct fcoe_fcf *new) +{ + struct fcoe_ctlr *fip = new->fip; + struct fcoe_ctlr_device *ctlr_dev; + struct fcoe_fcf_device *temp, *fcf_dev; + int rc = -ENOMEM; + + LIBFCOE_FIP_DBG(fip, "New FCF fab %16.16llx mac %pM\n", + new->fabric_name, new->fcf_mac); + + temp = kzalloc(sizeof(*temp), GFP_KERNEL); + if (!temp) + goto out; + + temp->fabric_name = new->fabric_name; + temp->switch_name = new->switch_name; + temp->fc_map = new->fc_map; + temp->vfid = new->vfid; + memcpy(temp->mac, new->fcf_mac, ETH_ALEN); + temp->priority = new->pri; + temp->fka_period = new->fka_period; + temp->selected = 0; /* default to unselected */ + + /* + * If ctlr_dev doesn't exist then it means we're a libfcoe user + * who doesn't use fcoe_syfs and didn't allocate a fcoe_ctlr_device. + * fnic would be an example of a driver with this behavior. In this + * case we want to add the fcoe_fcf to the fcoe_ctlr list, but we + * don't want to make sysfs changes. + */ + + ctlr_dev = fcoe_ctlr_to_ctlr_dev(fip); + if (ctlr_dev) { + mutex_lock(&ctlr_dev->lock); + fcf_dev = fcoe_fcf_device_add(ctlr_dev, temp); + if (unlikely(!fcf_dev)) { + rc = -ENOMEM; + mutex_unlock(&ctlr_dev->lock); + goto out; + } + + /* + * The fcoe_sysfs layer can return a CONNECTED fcf that + * has a priv (fcf was never deleted) or a CONNECTED fcf + * that doesn't have a priv (fcf was deleted). However, + * libfcoe will always delete FCFs before trying to add + * them. This is ensured because both recv_adv and + * age_fcfs are protected by the the fcoe_ctlr's mutex. + * This means that we should never get a FCF with a + * non-NULL priv pointer. + */ + BUG_ON(fcf_dev->priv); + + fcf_dev->priv = new; + new->fcf_dev = fcf_dev; + mutex_unlock(&ctlr_dev->lock); + } + + list_add(&new->list, &fip->fcfs); + fip->fcf_count++; + rc = 0; + +out: + kfree(temp); + return rc; +} + +/** + * fcoe_sysfs_fcf_del() - Remove a fcoe_fcf{,_device} to a fcoe_ctlr{,_device} + * @new: The FCF to be removed + * + * Called with fip->ctlr_mutex held + */ +static void fcoe_sysfs_fcf_del(struct fcoe_fcf *new) +{ + struct fcoe_ctlr *fip = new->fip; + struct fcoe_ctlr_device *cdev; + struct fcoe_fcf_device *fcf_dev; + + list_del(&new->list); + fip->fcf_count--; + + /* + * If ctlr_dev doesn't exist then it means we're a libfcoe user + * who doesn't use fcoe_syfs and didn't allocate a fcoe_ctlr_device + * or a fcoe_fcf_device. + * + * fnic would be an example of a driver with this behavior. In this + * case we want to remove the fcoe_fcf from the fcoe_ctlr list (above), + * but we don't want to make sysfs changes. + */ + cdev = fcoe_ctlr_to_ctlr_dev(fip); + if (cdev) { + mutex_lock(&cdev->lock); + fcf_dev = fcoe_fcf_to_fcf_dev(new); + WARN_ON(!fcf_dev); + new->fcf_dev = NULL; + fcoe_fcf_device_delete(fcf_dev); + mutex_unlock(&cdev->lock); + } + kfree(new); +} + +/** + * 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) { + fcoe_sysfs_fcf_del(fcf); + } + WARN_ON(fip->fcf_count); + + 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); + + mutex_lock(&fip->ctlr_mutex); + fcoe_ctlr_set_state(fip, FIP_ST_DISABLED); + fcoe_ctlr_reset_fcfs(fip); + mutex_unlock(&fip->ctlr_mutex); + del_timer_sync(&fip->timer); + cancel_work_sync(&fip->timer_work); +} +EXPORT_SYMBOL(fcoe_ctlr_destroy); + +/** + * fcoe_ctlr_announce() - announce new FCF selection + * @fip: The FCoE controller + * + * Also sets the destination MAC for FCoE and control packets + * + * Called with neither ctlr_mutex nor ctlr_lock held. + */ +static void fcoe_ctlr_announce(struct fcoe_ctlr *fip) +{ + struct fcoe_fcf *sel; + struct fcoe_fcf *fcf; + unsigned long flags; + + mutex_lock(&fip->ctlr_mutex); + spin_lock_irqsave(&fip->ctlr_lock, flags); + + kfree_skb(fip->flogi_req); + fip->flogi_req = NULL; + list_for_each_entry(fcf, &fip->fcfs, list) + fcf->flogi_sent = 0; + + spin_unlock_irqrestore(&fip->ctlr_lock, flags); + sel = fip->sel_fcf; + + if (sel && ether_addr_equal(sel->fcf_mac, fip->dest_addr)) + goto unlock; + if (!is_zero_ether_addr(fip->dest_addr)) { + printk(KERN_NOTICE "libfcoe: host%d: " + "FIP Fibre-Channel Forwarder MAC %pM deselected\n", + fip->lp->host->host_no, fip->dest_addr); + eth_zero_addr(fip->dest_addr); + } + 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->fcoe_mac, ETH_ALEN); + fip->map_dest = 0; + } +unlock: + mutex_unlock(&fip->ctlr_mutex); +} + +/** + * 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; + } __packed desc; + } __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->priority = fip->priority; + 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) +{ + mutex_lock(&fip->ctlr_mutex); + if (fip->state == FIP_ST_NON_FIP || fip->state == FIP_ST_AUTO) { + mutex_unlock(&fip->ctlr_mutex); + fc_linkup(fip->lp); + } else if (fip->state == FIP_ST_LINK_WAIT) { + if (fip->mode == FIP_MODE_NON_FIP) + fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP); + else + fcoe_ctlr_set_state(fip, FIP_ST_AUTO); + switch (fip->mode) { + default: + LIBFCOE_FIP_DBG(fip, "invalid mode %d\n", fip->mode); + fallthrough; + case FIP_MODE_AUTO: + LIBFCOE_FIP_DBG(fip, "%s", "setting AUTO mode.\n"); + fallthrough; + case FIP_MODE_FABRIC: + case FIP_MODE_NON_FIP: + mutex_unlock(&fip->ctlr_mutex); + fc_linkup(fip->lp); + fcoe_ctlr_solicit(fip, NULL); + break; + case FIP_MODE_VN2VN: + fcoe_ctlr_vn_start(fip); + mutex_unlock(&fip->ctlr_mutex); + fc_linkup(fip->lp); + break; + } + } else + mutex_unlock(&fip->ctlr_mutex); +} +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; + fcoe_ctlr_map_dest(fip); +} + +/** + * 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"); + mutex_lock(&fip->ctlr_mutex); + fcoe_ctlr_reset(fip); + link_dropped = fip->state != FIP_ST_LINK_WAIT; + fcoe_ctlr_set_state(fip, FIP_ST_LINK_WAIT); + mutex_unlock(&fip->ctlr_mutex); + + 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; + } __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 || (ports && !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->priority = fip->priority; + 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 + * @lport: The local port + * @dtype: The FIP descriptor type for the frame + * @skb: The FCoE ELS frame including FC header but no FCoE headers + * @d_id: The destination port ID. + * + * 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, u32 d_id) +{ + struct fip_encaps_head { + struct ethhdr eth; + struct fip_header fip; + struct fip_encaps encaps; + } __packed * cap; + struct fc_frame_header *fh; + struct fip_mac_desc *mac; + struct fcoe_fcf *fcf; + size_t dlen; + u16 fip_flags; + u8 op; + + fh = (struct fc_frame_header *)skb->data; + op = *(u8 *)(fh + 1); + dlen = sizeof(struct fip_encaps) + skb->len; /* len before push */ + cap = skb_push(skb, sizeof(*cap)); + memset(cap, 0, sizeof(*cap)); + + if (lport->point_to_multipoint) { + if (fcoe_ctlr_vn_lookup(fip, d_id, cap->eth.h_dest)) + return -ENODEV; + fip_flags = 0; + } else { + fcf = fip->sel_fcf; + if (!fcf) + return -ENODEV; + fip_flags = fcf->flags; + fip_flags &= fip->spma ? FIP_FL_SPMA | FIP_FL_FPMA : + FIP_FL_FPMA; + if (!fip_flags) + return -ENODEV; + 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); + if (op == ELS_LS_ACC || op == ELS_LS_RJT) + cap->fip.fip_subcode = FIP_SC_REP; + else + cap->fip.fip_subcode = FIP_SC_REQ; + cap->fip.fip_flags = htons(fip_flags); + + cap->encaps.fd_desc.fip_dtype = dtype; + cap->encaps.fd_desc.fip_dlen = dlen / FIP_BPW; + + if (op != ELS_LS_RJT) { + dlen += sizeof(*mac); + mac = skb_put_zero(skb, 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->mode == FIP_MODE_VN2VN) { + hton24(mac->fd_mac, FIP_VN_FC_MAP); + hton24(mac->fd_mac + 3, fip->port_id); + } 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 zeroed. */ + } + } + cap->fip.fip_dl_len = htons(dlen / FIP_BPW); + + skb->protocol = htons(ETH_P_FIP); + skb->priority = fip->priority; + 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). + * The the skb must also be an fc_frame. + * + * This is called from the lower-level driver with spinlocks held, + * so we must not take a mutex here. + */ +int fcoe_ctlr_els_send(struct fcoe_ctlr *fip, struct fc_lport *lport, + struct sk_buff *skb) +{ + struct fc_frame *fp; + struct fc_frame_header *fh; + unsigned long flags; + u16 old_xid; + u8 op; + u8 mac[ETH_ALEN]; + + fp = container_of(skb, struct fc_frame, skb); + fh = (struct fc_frame_header *)skb->data; + op = *(u8 *)(fh + 1); + + if (op == ELS_FLOGI && fip->mode != FIP_MODE_VN2VN) { + 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; + fcoe_ctlr_map_dest(fip); + return 0; + } + if (fip->state == FIP_ST_NON_FIP) + fcoe_ctlr_map_dest(fip); + } + + if (fip->state == FIP_ST_NON_FIP) + return 0; + if (!fip->sel_fcf && fip->mode != FIP_MODE_VN2VN) + goto drop; + switch (op) { + case ELS_FLOGI: + op = FIP_DT_FLOGI; + if (fip->mode == FIP_MODE_VN2VN) + break; + spin_lock_irqsave(&fip->ctlr_lock, flags); + kfree_skb(fip->flogi_req); + fip->flogi_req = skb; + fip->flogi_req_send = 1; + spin_unlock_irqrestore(&fip->ctlr_lock, flags); + schedule_work(&fip->timer_work); + return -EINPROGRESS; + case ELS_FDISC: + if (ntoh24(fh->fh_s_id)) + return 0; + op = FIP_DT_FDISC; + break; + case ELS_LOGO: + if (fip->mode == FIP_MODE_VN2VN) { + if (fip->state != FIP_ST_VNMP_UP) + goto drop; + if (ntoh24(fh->fh_d_id) == FC_FID_FLOGI) + goto drop; + } else { + 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 non-FIP, we may have 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 receiving the + * FLOGI. + */ + if (fip->state == FIP_ST_NON_FIP) { + if (fip->flogi_oxid == FC_XID_UNKNOWN) + return 0; + fip->flogi_oxid = FC_XID_UNKNOWN; + fc_fcoe_set_mac(mac, fh->fh_d_id); + fip->update_mac(lport, mac); + } + fallthrough; + case ELS_LS_RJT: + op = fr_encaps(fp); + if (op) + break; + return 0; + default: + if (fip->state != FIP_ST_ENABLED && + fip->state != FIP_ST_VNMP_UP) + goto drop; + return 0; + } + LIBFCOE_FIP_DBG(fip, "els_send op %u d_id %x\n", + op, ntoh24(fh->fh_d_id)); + if (fcoe_ctlr_encaps(fip, lport, op, skb, ntoh24(fh->fh_d_id))) + goto drop; + fip->send(fip, skb); + return -EINPROGRESS; +drop: + LIBFCOE_FIP_DBG(fip, "drop els_send op %u d_id %x\n", + op, ntoh24(fh->fh_d_id)); + 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 two advertisements. + * That is, there have been no valid advertisement from it for 2.5 + * times its keep-alive period. + * + * 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). + * + * Returns the time in jiffies for the next call. + */ +static unsigned long fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip) +{ + struct fcoe_fcf *fcf; + struct fcoe_fcf *next; + unsigned long next_timer = jiffies + msecs_to_jiffies(FIP_VN_KA_PERIOD); + unsigned long deadline; + unsigned long sel_time = 0; + struct list_head del_list; + + INIT_LIST_HEAD(&del_list); + + list_for_each_entry_safe(fcf, next, &fip->fcfs, list) { + deadline = fcf->time + fcf->fka_period + fcf->fka_period / 2; + if (fip->sel_fcf == fcf) { + if (time_after(jiffies, deadline)) { + u64 miss_cnt; + + miss_cnt = this_cpu_inc_return(fip->lp->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, + miss_cnt); + } else if (time_after(next_timer, deadline)) + next_timer = deadline; + } + + deadline += fcf->fka_period; + if (time_after_eq(jiffies, deadline)) { + if (fip->sel_fcf == fcf) + fip->sel_fcf = NULL; + /* + * Move to delete list so we can call + * fcoe_sysfs_fcf_del (which can sleep) + * after the put_cpu(). + */ + list_del(&fcf->list); + list_add(&fcf->list, &del_list); + this_cpu_inc(fip->lp->stats->VLinkFailureCount); + } else { + if (time_after(next_timer, deadline)) + next_timer = deadline; + if (fcoe_ctlr_mtu_valid(fcf) && + (!sel_time || time_before(sel_time, fcf->time))) + sel_time = fcf->time; + } + } + + list_for_each_entry_safe(fcf, next, &del_list, list) { + /* Removes fcf from current list */ + fcoe_sysfs_fcf_del(fcf); + } + + if (sel_time && !fip->sel_fcf && !fip->sel_time) { + sel_time += msecs_to_jiffies(FCOE_CTLR_START_DELAY); + fip->sel_time = sel_time; + } + + return next_timer; +} + +/** + * 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; + u32 desc_mask; + + 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); + + /* + * mask of required descriptors. validating each one clears its bit. + */ + desc_mask = BIT(FIP_DT_PRI) | BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) | + BIT(FIP_DT_FAB) | BIT(FIP_DT_FKA); + + 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; + /* Drop Adv if there are duplicate critical descriptors */ + if ((desc->fip_dtype < 32) && + !(desc_mask & 1U << desc->fip_dtype)) { + LIBFCOE_FIP_DBG(fip, "Duplicate Critical " + "Descriptors in FIP adv\n"); + 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; + desc_mask &= ~BIT(FIP_DT_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); + memcpy(fcf->fcoe_mac, fcf->fcf_mac, ETH_ALEN); + if (!is_valid_ether_addr(fcf->fcf_mac)) { + LIBFCOE_FIP_DBG(fip, + "Invalid MAC addr %pM in FIP adv\n", + fcf->fcf_mac); + return -EINVAL; + } + desc_mask &= ~BIT(FIP_DT_MAC); + 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); + desc_mask &= ~BIT(FIP_DT_NAME); + 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); + desc_mask &= ~BIT(FIP_DT_FAB); + 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); + desc_mask &= ~BIT(FIP_DT_FKA); + 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_NON_CRITICAL) + return -EINVAL; + break; + } + desc = (struct fip_desc *)((char *)desc + dlen); + rlen -= dlen; + } + if (!fcf->fc_map || (fcf->fc_map & 0x10000)) + return -EINVAL; + if (!fcf->switch_name) + return -EINVAL; + if (desc_mask) { + LIBFCOE_FIP_DBG(fip, "adv missing descriptors mask %x\n", + desc_mask); + 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; + unsigned long sol_tov = msecs_to_jiffies(FCOE_CTLR_SOL_TOV); + int first = 0; + int mtu_valid; + int found = 0; + int rc = 0; + + if (fcoe_ctlr_parse_adv(fip, skb, &new)) + return; + + mutex_lock(&fip->ctlr_mutex); + first = list_empty(&fip->fcfs); + 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 && + ether_addr_equal(fcf->fcf_mac, new.fcf_mac)) { + found = 1; + break; + } + } + if (!found) { + if (fip->fcf_count >= FCOE_CTLR_FCF_LIMIT) + goto out; + + fcf = kmalloc(sizeof(*fcf), GFP_ATOMIC); + if (!fcf) + goto out; + + memcpy(fcf, &new, sizeof(new)); + fcf->fip = fip; + rc = fcoe_sysfs_fcf_add(fcf); + if (rc) { + printk(KERN_ERR "Failed to allocate sysfs instance " + "for FCF, fab %16.16llx mac %pM\n", + new.fabric_name, new.fcf_mac); + kfree(fcf); + goto out; + } + } else { + /* + * Update the FCF's keep-alive descriptor flags. + * Other flag changes from new advertisements are + * ignored after a solicited advertisement is + * received and the FCF is selectable (usable). + */ + fcf->fd_flags = new.fd_flags; + if (!fcoe_ctlr_fcf_usable(fcf)) + fcf->flags = new.flags; + + if (fcf == fip->sel_fcf && !fcf->fd_flags) { + 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); + } + 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 fab %16.16llx mac %pM\n", + fcf->fabric_name, fcf->fcf_mac); + + /* + * 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); + + /* + * Put this FCF at the head of the list for priority among equals. + * This helps in the case of an NPV switch which insists we use + * the FCF that answers multicast solicitations, not the others that + * are sending periodic multicast advertisements. + */ + if (mtu_valid) + list_move(&fcf->list, &fip->fcfs); + + /* + * If this is the first validated FCF, note the time and + * set a timer to trigger selection. + */ + if (mtu_valid && !fip->sel_fcf && !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: + mutex_unlock(&fip->ctlr_mutex); +} + +/** + * 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_fcf *sel; + 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; + u32 desc_mask = 0; + u32 desc_cnt = 0; + + 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) { + desc_cnt++; + dlen = desc->fip_dlen * FIP_BPW; + if (dlen < sizeof(*desc) || dlen > rlen) + goto drop; + /* Drop ELS if there are duplicate critical descriptors */ + if (desc->fip_dtype < 32) { + if ((desc->fip_dtype != FIP_DT_MAC) && + (desc_mask & 1U << desc->fip_dtype)) { + LIBFCOE_FIP_DBG(fip, "Duplicate Critical " + "Descriptors in FIP ELS\n"); + goto drop; + } + desc_mask |= (1 << desc->fip_dtype); + } + switch (desc->fip_dtype) { + case FIP_DT_MAC: + sel = fip->sel_fcf; + if (desc_cnt == 1) { + LIBFCOE_FIP_DBG(fip, "FIP descriptors " + "received out of order\n"); + goto drop; + } + /* + * Some switch implementations send two MAC descriptors, + * with first MAC(granted_mac) being the FPMA, and the + * second one(fcoe_mac) is used as destination address + * for sending/receiving FCoE packets. FIP traffic is + * sent using fip_mac. For regular switches, both + * fip_mac and fcoe_mac would be the same. + */ + if (desc_cnt == 2) + memcpy(granted_mac, + ((struct fip_mac_desc *)desc)->fd_mac, + ETH_ALEN); + + if (dlen != sizeof(struct fip_mac_desc)) + goto len_err; + + if ((desc_cnt == 3) && (sel)) + memcpy(sel->fcoe_mac, + ((struct fip_mac_desc *)desc)->fd_mac, + ETH_ALEN); + break; + case FIP_DT_FLOGI: + case FIP_DT_FDISC: + case FIP_DT_LOGO: + case FIP_DT_ELP: + if (desc_cnt != 1) { + LIBFCOE_FIP_DBG(fip, "FIP descriptors " + "received out of order\n"); + goto drop; + } + 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_NON_CRITICAL) + goto drop; + if (desc_cnt <= 2) { + LIBFCOE_FIP_DBG(fip, "FIP descriptors " + "received out of order\n"); + goto drop; + } + break; + } + desc = (struct fip_desc *)((char *)desc + dlen); + rlen -= dlen; + } + + if (!fh) + goto drop; + els_op = *(u8 *)(fh + 1); + + if ((els_dtype == FIP_DT_FLOGI || els_dtype == FIP_DT_FDISC) && + sub == FIP_SC_REP && fip->mode != FIP_MODE_VN2VN) { + if (els_op == ELS_LS_ACC) { + if (!is_valid_ether_addr(granted_mac)) { + LIBFCOE_FIP_DBG(fip, + "Invalid MAC address %pM in FIP ELS\n", + granted_mac); + goto drop; + } + memcpy(fr_cb(fp)->granted_mac, granted_mac, ETH_ALEN); + + if (fip->flogi_oxid == ntohs(fh->fh_ox_id)) { + fip->flogi_oxid = FC_XID_UNKNOWN; + if (els_dtype == FIP_DT_FLOGI) + fcoe_ctlr_announce(fip); + } + } else if (els_dtype == FIP_DT_FLOGI && + !fcoe_ctlr_flogi_retry(fip)) + goto drop; /* retrying FLOGI so drop reject */ + } + + if ((desc_cnt == 0) || ((els_op != ELS_LS_RJT) && + (!(1U << FIP_DT_MAC & desc_mask)))) { + LIBFCOE_FIP_DBG(fip, "Missing critical descriptors " + "in FIP ELS\n"); + goto drop; + } + + /* + * 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; + fr_encaps(fp) = els_dtype; + + this_cpu_inc(lport->stats->RxFrames); + this_cpu_add(lport->stats->RxWords, skb->len / FIP_BPW); + + 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_clr_vlink() - Handle an incoming link reset frame + * @fip: The FCoE controller that received the frame + * @skb: The received FIP packet + * + * 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 sk_buff *skb) +{ + 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; + struct fc_lport *vn_port = NULL; + u32 desc_mask; + int num_vlink_desc; + int reset_phys_port = 0; + struct fip_vn_desc **vlink_desc_arr = NULL; + struct fip_header *fh = (struct fip_header *)skb->data; + struct ethhdr *eh = eth_hdr(skb); + + LIBFCOE_FIP_DBG(fip, "Clear Virtual Link received\n"); + + if (!fcf) { + /* + * We are yet to select best FCF, but we got CVL in the + * meantime. reset the ctlr and let it rediscover the FCF + */ + LIBFCOE_FIP_DBG(fip, "Resetting fcoe_ctlr as FCF has not been " + "selected yet\n"); + mutex_lock(&fip->ctlr_mutex); + fcoe_ctlr_reset(fip); + mutex_unlock(&fip->ctlr_mutex); + return; + } + + /* + * If we've selected an FCF check that the CVL is from there to avoid + * processing CVLs from an unexpected source. If it is from an + * unexpected source drop it on the floor. + */ + if (!ether_addr_equal(eh->h_source, fcf->fcf_mac)) { + LIBFCOE_FIP_DBG(fip, "Dropping CVL due to source address " + "mismatch with FCF src=%pM\n", eh->h_source); + return; + } + + /* + * If we haven't logged into the fabric but receive a CVL we should + * reset everything and go back to solicitation. + */ + if (!lport->port_id) { + LIBFCOE_FIP_DBG(fip, "lport not logged in, resoliciting\n"); + mutex_lock(&fip->ctlr_mutex); + fcoe_ctlr_reset(fip); + mutex_unlock(&fip->ctlr_mutex); + fc_lport_reset(fip->lp); + fcoe_ctlr_solicit(fip, NULL); + return; + } + + /* + * mask of required descriptors. Validating each one clears its bit. + */ + desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME); + + rlen = ntohs(fh->fip_dl_len) * FIP_BPW; + desc = (struct fip_desc *)(fh + 1); + + /* + * Actually need to subtract 'sizeof(*mp) - sizeof(*wp)' from 'rlen' + * before determining max Vx_Port descriptor but a buggy FCF could have + * omitted either or both MAC Address and Name Identifier descriptors + */ + num_vlink_desc = rlen / sizeof(*vp); + if (num_vlink_desc) + vlink_desc_arr = kmalloc_array(num_vlink_desc, sizeof(vp), + GFP_ATOMIC); + if (!vlink_desc_arr) + return; + num_vlink_desc = 0; + + while (rlen >= sizeof(*desc)) { + dlen = desc->fip_dlen * FIP_BPW; + if (dlen > rlen) + goto err; + /* Drop CVL if there are duplicate critical descriptors */ + if ((desc->fip_dtype < 32) && + (desc->fip_dtype != FIP_DT_VN_ID) && + !(desc_mask & 1U << desc->fip_dtype)) { + LIBFCOE_FIP_DBG(fip, "Duplicate Critical " + "Descriptors in FIP CVL\n"); + goto err; + } + switch (desc->fip_dtype) { + case FIP_DT_MAC: + mp = (struct fip_mac_desc *)desc; + if (dlen < sizeof(*mp)) + goto err; + if (!ether_addr_equal(mp->fd_mac, fcf->fcf_mac)) + goto err; + desc_mask &= ~BIT(FIP_DT_MAC); + break; + case FIP_DT_NAME: + wp = (struct fip_wwn_desc *)desc; + if (dlen < sizeof(*wp)) + goto err; + if (get_unaligned_be64(&wp->fd_wwn) != fcf->switch_name) + goto err; + desc_mask &= ~BIT(FIP_DT_NAME); + break; + case FIP_DT_VN_ID: + vp = (struct fip_vn_desc *)desc; + if (dlen < sizeof(*vp)) + goto err; + vlink_desc_arr[num_vlink_desc++] = vp; + vn_port = fc_vport_id_lookup(lport, + ntoh24(vp->fd_fc_id)); + if (vn_port && (vn_port == lport)) { + mutex_lock(&fip->ctlr_mutex); + this_cpu_inc(lport->stats->VLinkFailureCount); + fcoe_ctlr_reset(fip); + mutex_unlock(&fip->ctlr_mutex); + } + break; + default: + /* standard says ignore unknown descriptors >= 128 */ + if (desc->fip_dtype < FIP_DT_NON_CRITICAL) + goto err; + 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 if (!num_vlink_desc) { + LIBFCOE_FIP_DBG(fip, "CVL: no Vx_Port descriptor found\n"); + /* + * No Vx_Port description. Clear all NPIV ports, + * followed by physical port + */ + mutex_lock(&fip->ctlr_mutex); + this_cpu_inc(lport->stats->VLinkFailureCount); + fcoe_ctlr_reset(fip); + mutex_unlock(&fip->ctlr_mutex); + + mutex_lock(&lport->lp_mutex); + list_for_each_entry(vn_port, &lport->vports, list) + fc_lport_reset(vn_port); + mutex_unlock(&lport->lp_mutex); + + fc_lport_reset(fip->lp); + fcoe_ctlr_solicit(fip, NULL); + } else { + int i; + + LIBFCOE_FIP_DBG(fip, "performing Clear Virtual Link\n"); + for (i = 0; i < num_vlink_desc; i++) { + vp = vlink_desc_arr[i]; + vn_port = fc_vport_id_lookup(lport, + ntoh24(vp->fd_fc_id)); + if (!vn_port) + continue; + + /* + * 'port_id' is already validated, check MAC address and + * wwpn + */ + if (!ether_addr_equal(fip->get_src_addr(vn_port), + vp->fd_mac) || + get_unaligned_be64(&vp->fd_wwpn) != + vn_port->wwpn) + continue; + + if (vn_port == lport) + /* + * Physical port, defer processing till all + * listed NPIV ports are cleared + */ + reset_phys_port = 1; + else /* NPIV port */ + fc_lport_reset(vn_port); + } + + if (reset_phys_port) { + fc_lport_reset(fip->lp); + fcoe_ctlr_solicit(fip, NULL); + } + } + +err: + kfree(vlink_desc_arr); +} + +/** + * 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 = skb_share_check(skb, GFP_ATOMIC); + if (!skb) + return; + 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; + bool fip_vlan_resp = false; + u16 op; + u8 sub; + + if (skb_linearize(skb)) + goto drop; + if (skb->len < sizeof(*fiph)) + goto drop; + eh = eth_hdr(skb); + if (fip->mode == FIP_MODE_VN2VN) { + if (!ether_addr_equal(eh->h_dest, fip->ctl_src_addr) && + !ether_addr_equal(eh->h_dest, fcoe_all_vn2vn) && + !ether_addr_equal(eh->h_dest, fcoe_all_p2p)) + goto drop; + } else if (!ether_addr_equal(eh->h_dest, fip->ctl_src_addr) && + !ether_addr_equal(eh->h_dest, fcoe_all_enode)) + 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; + + mutex_lock(&fip->ctlr_mutex); + state = fip->state; + if (state == FIP_ST_AUTO) { + fip->map_dest = 0; + fcoe_ctlr_set_state(fip, FIP_ST_ENABLED); + state = FIP_ST_ENABLED; + LIBFCOE_FIP_DBG(fip, "Using FIP mode\n"); + } + fip_vlan_resp = fip->fip_resp; + mutex_unlock(&fip->ctlr_mutex); + + if (fip->mode == FIP_MODE_VN2VN && op == FIP_OP_VN2VN) + return fcoe_ctlr_vn_recv(fip, skb); + + if (fip_vlan_resp && op == FIP_OP_VLAN) { + LIBFCOE_FIP_DBG(fip, "fip vlan discovery\n"); + return fcoe_ctlr_vlan_recv(fip, skb); + } + + if (state != FIP_ST_ENABLED && state != FIP_ST_VNMP_UP && + state != FIP_ST_VNMP_CLAIM) + goto drop; + + if (op == FIP_OP_LS) { + fcoe_ctlr_recv_els(fip, skb); /* consumes skb */ + return 0; + } + + if (state != FIP_ST_ENABLED) + goto drop; + + 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, skb); + kfree_skb(skb); + return 0; +drop: + kfree_skb(skb); + return -1; +} + +/** + * fcoe_ctlr_select() - Select the best FCF (if possible) + * @fip: The FCoE controller + * + * Returns the selected FCF, or NULL if none are usable. + * + * If there are conflicting advertisements, no FCF can be chosen. + * + * If there is already a selected FCF, this will choose a better one or + * an equivalent one that hasn't already been sent a FLOGI. + * + * Called with lock held. + */ +static struct fcoe_fcf *fcoe_ctlr_select(struct fcoe_ctlr *fip) +{ + struct fcoe_fcf *fcf; + struct fcoe_fcf *best = fip->sel_fcf; + + list_for_each_entry(fcf, &fip->fcfs, list) { + LIBFCOE_FIP_DBG(fip, "consider FCF fab %16.16llx " + "VFID %d mac %pM map %x val %d " + "sent %u pri %u\n", + fcf->fabric_name, fcf->vfid, fcf->fcf_mac, + fcf->fc_map, fcoe_ctlr_mtu_valid(fcf), + fcf->flogi_sent, fcf->pri); + 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 || fcf->pri < best->pri || best->flogi_sent) + best = fcf; + 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 NULL; + } + } + fip->sel_fcf = best; + if (best) { + LIBFCOE_FIP_DBG(fip, "using FCF mac %pM\n", best->fcf_mac); + fip->port_ka_time = jiffies + + msecs_to_jiffies(FIP_VN_KA_PERIOD); + fip->ctlr_ka_time = jiffies + best->fka_period; + if (time_before(fip->ctlr_ka_time, fip->timer.expires)) + mod_timer(&fip->timer, fip->ctlr_ka_time); + } + return best; +} + +/** + * fcoe_ctlr_flogi_send_locked() - send FIP-encapsulated FLOGI to current FCF + * @fip: The FCoE controller + * + * Returns non-zero error if it could not be sent. + * + * Called with ctlr_mutex and ctlr_lock held. + * Caller must verify that fip->sel_fcf is not NULL. + */ +static int fcoe_ctlr_flogi_send_locked(struct fcoe_ctlr *fip) +{ + struct sk_buff *skb; + struct sk_buff *skb_orig; + struct fc_frame_header *fh; + int error; + + skb_orig = fip->flogi_req; + if (!skb_orig) + return -EINVAL; + + /* + * Clone and send the FLOGI request. If clone fails, use original. + */ + skb = skb_clone(skb_orig, GFP_ATOMIC); + if (!skb) { + skb = skb_orig; + fip->flogi_req = NULL; + } + fh = (struct fc_frame_header *)skb->data; + error = fcoe_ctlr_encaps(fip, fip->lp, FIP_DT_FLOGI, skb, + ntoh24(fh->fh_d_id)); + if (error) { + kfree_skb(skb); + return error; + } + fip->send(fip, skb); + fip->sel_fcf->flogi_sent = 1; + return 0; +} + +/** + * fcoe_ctlr_flogi_retry() - resend FLOGI request to a new FCF if possible + * @fip: The FCoE controller + * + * Returns non-zero error code if there's no FLOGI request to retry or + * no alternate FCF available. + */ +static int fcoe_ctlr_flogi_retry(struct fcoe_ctlr *fip) +{ + struct fcoe_fcf *fcf; + unsigned long flags; + int error; + + mutex_lock(&fip->ctlr_mutex); + spin_lock_irqsave(&fip->ctlr_lock, flags); + LIBFCOE_FIP_DBG(fip, "re-sending FLOGI - reselect\n"); + fcf = fcoe_ctlr_select(fip); + if (!fcf || fcf->flogi_sent) { + kfree_skb(fip->flogi_req); + fip->flogi_req = NULL; + error = -ENOENT; + } else { + fcoe_ctlr_solicit(fip, NULL); + error = fcoe_ctlr_flogi_send_locked(fip); + } + spin_unlock_irqrestore(&fip->ctlr_lock, flags); + mutex_unlock(&fip->ctlr_mutex); + return error; +} + + +/** + * fcoe_ctlr_flogi_send() - Handle sending of FIP FLOGI. + * @fip: The FCoE controller that timed out + * + * Done here because fcoe_ctlr_els_send() can't get mutex. + * + * Called with ctlr_mutex held. The caller must not hold ctlr_lock. + */ +static void fcoe_ctlr_flogi_send(struct fcoe_ctlr *fip) +{ + struct fcoe_fcf *fcf; + unsigned long flags; + + spin_lock_irqsave(&fip->ctlr_lock, flags); + fcf = fip->sel_fcf; + if (!fcf || !fip->flogi_req_send) + goto unlock; + + LIBFCOE_FIP_DBG(fip, "sending FLOGI\n"); + + /* + * If this FLOGI is being sent due to a timeout retry + * to the same FCF as before, select a different FCF if possible. + */ + if (fcf->flogi_sent) { + LIBFCOE_FIP_DBG(fip, "sending FLOGI - reselect\n"); + fcf = fcoe_ctlr_select(fip); + if (!fcf || fcf->flogi_sent) { + LIBFCOE_FIP_DBG(fip, "sending FLOGI - clearing\n"); + list_for_each_entry(fcf, &fip->fcfs, list) + fcf->flogi_sent = 0; + fcf = fcoe_ctlr_select(fip); + } + } + if (fcf) { + fcoe_ctlr_flogi_send_locked(fip); + fip->flogi_req_send = 0; + } else /* XXX */ + LIBFCOE_FIP_DBG(fip, "No FCF selected - defer send\n"); +unlock: + spin_unlock_irqrestore(&fip->ctlr_lock, flags); +} + +/** + * fcoe_ctlr_timeout() - FIP timeout handler + * @t: Timer context use to obtain the controller reference + */ +static void fcoe_ctlr_timeout(struct timer_list *t) +{ + struct fcoe_ctlr *fip = from_timer(fip, t, timer); + + schedule_work(&fip->timer_work); +} + +/** + * fcoe_ctlr_timer_work() - Worker thread function for timer work + * @work: Handle to a FCoE controller + * + * Ages FCFs. Triggers FCF selection if possible. + * Sends keep-alives and resets. + */ +static void fcoe_ctlr_timer_work(struct work_struct *work) +{ + struct fcoe_ctlr *fip; + struct fc_lport *vport; + u8 *mac; + u8 reset = 0; + u8 send_ctlr_ka = 0; + u8 send_port_ka = 0; + struct fcoe_fcf *sel; + struct fcoe_fcf *fcf; + unsigned long next_timer; + + fip = container_of(work, struct fcoe_ctlr, timer_work); + if (fip->mode == FIP_MODE_VN2VN) + return fcoe_ctlr_vn_timeout(fip); + mutex_lock(&fip->ctlr_mutex); + if (fip->state == FIP_ST_DISABLED) { + mutex_unlock(&fip->ctlr_mutex); + return; + } + + fcf = fip->sel_fcf; + next_timer = fcoe_ctlr_age_fcfs(fip); + + sel = fip->sel_fcf; + if (!sel && fip->sel_time) { + if (time_after_eq(jiffies, fip->sel_time)) { + sel = fcoe_ctlr_select(fip); + fip->sel_time = 0; + } else if (time_after(next_timer, fip->sel_time)) + next_timer = fip->sel_time; + } + + if (sel && fip->flogi_req_send) + fcoe_ctlr_flogi_send(fip); + else if (!sel && fcf) + reset = 1; + + if (sel && !sel->fd_flags) { + if (time_after_eq(jiffies, fip->ctlr_ka_time)) { + fip->ctlr_ka_time = jiffies + sel->fka_period; + 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); + send_port_ka = 1; + } + if (time_after(next_timer, fip->port_ka_time)) + next_timer = fip->port_ka_time; + } + if (!list_empty(&fip->fcfs)) + mod_timer(&fip->timer, next_timer); + mutex_unlock(&fip->ctlr_mutex); + + if (reset) { + fc_lport_reset(fip->lp); + /* restart things with a solicitation */ + fcoe_ctlr_solicit(fip, NULL); + } + + if (send_ctlr_ka) + fcoe_ctlr_send_keep_alive(fip, NULL, 0, fip->ctl_src_addr); + + if (send_port_ka) { + 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 + * @lport: The local port + * @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)) { + + mutex_lock(&fip->ctlr_mutex); + if (fip->state != FIP_ST_AUTO && fip->state != FIP_ST_NON_FIP) { + mutex_unlock(&fip->ctlr_mutex); + return -EINVAL; + } + fcoe_ctlr_set_state(fip, 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 (ether_addr_equal(sa, (u8[6])FC_FCOE_FLOGI_MAC)) { + fcoe_ctlr_map_dest(fip); + } else { + memcpy(fip->dest_addr, sa, ETH_ALEN); + fip->map_dest = 0; + } + fip->flogi_oxid = FC_XID_UNKNOWN; + mutex_unlock(&fip->ctlr_mutex); + 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. + */ + mutex_lock(&fip->ctlr_mutex); + 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"); + fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP); + } + mutex_unlock(&fip->ctlr_mutex); + } + 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[ETH_ALEN], + 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_ctlr_rport() - return the fcoe_rport for a given fc_rport_priv + * @rdata: libfc remote port + */ +static inline struct fcoe_rport *fcoe_ctlr_rport(struct fc_rport_priv *rdata) +{ + return container_of(rdata, struct fcoe_rport, rdata); +} + +/** + * fcoe_ctlr_vn_send() - Send a FIP VN2VN Probe Request or Reply. + * @fip: The FCoE controller + * @sub: sub-opcode for probe request, reply, or advertisement. + * @dest: The destination Ethernet MAC address + * @min_len: minimum size of the Ethernet payload to be sent + */ +static void fcoe_ctlr_vn_send(struct fcoe_ctlr *fip, + enum fip_vn2vn_subcode sub, + const u8 *dest, size_t min_len) +{ + struct sk_buff *skb; + struct fip_vn2vn_probe_frame { + struct ethhdr eth; + struct fip_header fip; + struct fip_mac_desc mac; + struct fip_wwn_desc wwnn; + struct fip_vn_desc vn; + } __packed * frame; + struct fip_fc4_feat *ff; + struct fip_size_desc *size; + u32 fcp_feat; + size_t len; + size_t dlen; + + len = sizeof(*frame); + dlen = 0; + if (sub == FIP_SC_VN_CLAIM_NOTIFY || sub == FIP_SC_VN_CLAIM_REP) { + dlen = sizeof(struct fip_fc4_feat) + + sizeof(struct fip_size_desc); + len += dlen; + } + dlen += sizeof(frame->mac) + sizeof(frame->wwnn) + sizeof(frame->vn); + len = max(len, min_len + sizeof(struct ethhdr)); + + skb = dev_alloc_skb(len); + if (!skb) + return; + + frame = (struct fip_vn2vn_probe_frame *)skb->data; + memset(frame, 0, len); + memcpy(frame->eth.h_dest, dest, ETH_ALEN); + + if (sub == FIP_SC_VN_BEACON) { + hton24(frame->eth.h_source, FIP_VN_FC_MAP); + hton24(frame->eth.h_source + 3, fip->port_id); + } else { + memcpy(frame->eth.h_source, fip->ctl_src_addr, ETH_ALEN); + } + frame->eth.h_proto = htons(ETH_P_FIP); + + frame->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER); + frame->fip.fip_op = htons(FIP_OP_VN2VN); + frame->fip.fip_subcode = sub; + frame->fip.fip_dl_len = htons(dlen / FIP_BPW); + + frame->mac.fd_desc.fip_dtype = FIP_DT_MAC; + frame->mac.fd_desc.fip_dlen = sizeof(frame->mac) / FIP_BPW; + memcpy(frame->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN); + + frame->wwnn.fd_desc.fip_dtype = FIP_DT_NAME; + frame->wwnn.fd_desc.fip_dlen = sizeof(frame->wwnn) / FIP_BPW; + put_unaligned_be64(fip->lp->wwnn, &frame->wwnn.fd_wwn); + + frame->vn.fd_desc.fip_dtype = FIP_DT_VN_ID; + frame->vn.fd_desc.fip_dlen = sizeof(frame->vn) / FIP_BPW; + hton24(frame->vn.fd_mac, FIP_VN_FC_MAP); + hton24(frame->vn.fd_mac + 3, fip->port_id); + hton24(frame->vn.fd_fc_id, fip->port_id); + put_unaligned_be64(fip->lp->wwpn, &frame->vn.fd_wwpn); + + /* + * For claims, add FC-4 features. + * TBD: Add interface to get fc-4 types and features from libfc. + */ + if (sub == FIP_SC_VN_CLAIM_NOTIFY || sub == FIP_SC_VN_CLAIM_REP) { + ff = (struct fip_fc4_feat *)(frame + 1); + ff->fd_desc.fip_dtype = FIP_DT_FC4F; + ff->fd_desc.fip_dlen = sizeof(*ff) / FIP_BPW; + ff->fd_fts = fip->lp->fcts; + + fcp_feat = 0; + if (fip->lp->service_params & FCP_SPPF_INIT_FCN) + fcp_feat |= FCP_FEAT_INIT; + if (fip->lp->service_params & FCP_SPPF_TARG_FCN) + fcp_feat |= FCP_FEAT_TARG; + fcp_feat <<= (FC_TYPE_FCP * 4) % 32; + ff->fd_ff.fd_feat[FC_TYPE_FCP * 4 / 32] = htonl(fcp_feat); + + size = (struct fip_size_desc *)(ff + 1); + size->fd_desc.fip_dtype = FIP_DT_FCOE_SIZE; + size->fd_desc.fip_dlen = sizeof(*size) / FIP_BPW; + size->fd_size = htons(fcoe_ctlr_fcoe_size(fip)); + } + + skb_put(skb, len); + skb->protocol = htons(ETH_P_FIP); + skb->priority = fip->priority; + skb_reset_mac_header(skb); + skb_reset_network_header(skb); + + fip->send(fip, skb); +} + +/** + * fcoe_ctlr_vn_rport_callback - Event handler for rport events. + * @lport: The lport which is receiving the event + * @rdata: remote port private data + * @event: The event that occurred + * + * Locking Note: The rport lock must not be held when calling this function. + */ +static void fcoe_ctlr_vn_rport_callback(struct fc_lport *lport, + struct fc_rport_priv *rdata, + enum fc_rport_event event) +{ + struct fcoe_ctlr *fip = lport->disc.priv; + struct fcoe_rport *frport = fcoe_ctlr_rport(rdata); + + LIBFCOE_FIP_DBG(fip, "vn_rport_callback %x event %d\n", + rdata->ids.port_id, event); + + mutex_lock(&fip->ctlr_mutex); + switch (event) { + case RPORT_EV_READY: + frport->login_count = 0; + break; + case RPORT_EV_LOGO: + case RPORT_EV_FAILED: + case RPORT_EV_STOP: + frport->login_count++; + if (frport->login_count > FCOE_CTLR_VN2VN_LOGIN_LIMIT) { + LIBFCOE_FIP_DBG(fip, + "rport FLOGI limited port_id %6.6x\n", + rdata->ids.port_id); + fc_rport_logoff(rdata); + } + break; + default: + break; + } + mutex_unlock(&fip->ctlr_mutex); +} + +static struct fc_rport_operations fcoe_ctlr_vn_rport_ops = { + .event_callback = fcoe_ctlr_vn_rport_callback, +}; + +/** + * fcoe_ctlr_disc_stop_locked() - stop discovery in VN2VN mode + * @lport: The local port + * + * Called with ctlr_mutex held. + */ +static void fcoe_ctlr_disc_stop_locked(struct fc_lport *lport) +{ + struct fc_rport_priv *rdata; + + mutex_lock(&lport->disc.disc_mutex); + list_for_each_entry_rcu(rdata, &lport->disc.rports, peers) { + if (kref_get_unless_zero(&rdata->kref)) { + fc_rport_logoff(rdata); + kref_put(&rdata->kref, fc_rport_destroy); + } + } + lport->disc.disc_callback = NULL; + mutex_unlock(&lport->disc.disc_mutex); +} + +/** + * fcoe_ctlr_disc_stop() - stop discovery in VN2VN mode + * @lport: The local port + * + * Called through the local port template for discovery. + * Called without the ctlr_mutex held. + */ +static void fcoe_ctlr_disc_stop(struct fc_lport *lport) +{ + struct fcoe_ctlr *fip = lport->disc.priv; + + mutex_lock(&fip->ctlr_mutex); + fcoe_ctlr_disc_stop_locked(lport); + mutex_unlock(&fip->ctlr_mutex); +} + +/** + * fcoe_ctlr_disc_stop_final() - stop discovery for shutdown in VN2VN mode + * @lport: The local port + * + * Called through the local port template for discovery. + * Called without the ctlr_mutex held. + */ +static void fcoe_ctlr_disc_stop_final(struct fc_lport *lport) +{ + fcoe_ctlr_disc_stop(lport); + fc_rport_flush_queue(); + synchronize_rcu(); +} + +/** + * fcoe_ctlr_vn_restart() - VN2VN probe restart with new port_id + * @fip: The FCoE controller + * + * Called with fcoe_ctlr lock held. + */ +static void fcoe_ctlr_vn_restart(struct fcoe_ctlr *fip) +{ + unsigned long wait; + u32 port_id; + + fcoe_ctlr_disc_stop_locked(fip->lp); + + /* + * Get proposed port ID. + * If this is the first try after link up, use any previous port_id. + * If there was none, use the low bits of the port_name. + * On subsequent tries, get the next random one. + * Don't use reserved IDs, use another non-zero value, just as random. + */ + port_id = fip->port_id; + if (fip->probe_tries) + port_id = prandom_u32_state(&fip->rnd_state) & 0xffff; + else if (!port_id) + port_id = fip->lp->wwpn & 0xffff; + if (!port_id || port_id == 0xffff) + port_id = 1; + fip->port_id = port_id; + + if (fip->probe_tries < FIP_VN_RLIM_COUNT) { + fip->probe_tries++; + wait = prandom_u32_max(FIP_VN_PROBE_WAIT); + } else + wait = FIP_VN_RLIM_INT; + mod_timer(&fip->timer, jiffies + msecs_to_jiffies(wait)); + fcoe_ctlr_set_state(fip, FIP_ST_VNMP_START); +} + +/** + * fcoe_ctlr_vn_start() - Start in VN2VN mode + * @fip: The FCoE controller + * + * Called with fcoe_ctlr lock held. + */ +static void fcoe_ctlr_vn_start(struct fcoe_ctlr *fip) +{ + fip->probe_tries = 0; + prandom_seed_state(&fip->rnd_state, fip->lp->wwpn); + fcoe_ctlr_vn_restart(fip); +} + +/** + * fcoe_ctlr_vn_parse - parse probe request or response + * @fip: The FCoE controller + * @skb: incoming packet + * @frport: parsed FCoE rport from the probe request + * + * Returns non-zero error number on error. + * Does not consume the packet. + */ +static int fcoe_ctlr_vn_parse(struct fcoe_ctlr *fip, + struct sk_buff *skb, + struct fcoe_rport *frport) +{ + struct fip_header *fiph; + struct fip_desc *desc = NULL; + struct fip_mac_desc *macd = NULL; + struct fip_wwn_desc *wwn = NULL; + struct fip_vn_desc *vn = NULL; + struct fip_size_desc *size = NULL; + size_t rlen; + size_t dlen; + u32 desc_mask = 0; + u32 dtype; + u8 sub; + + fiph = (struct fip_header *)skb->data; + frport->flags = ntohs(fiph->fip_flags); + + sub = fiph->fip_subcode; + switch (sub) { + case FIP_SC_VN_PROBE_REQ: + case FIP_SC_VN_PROBE_REP: + case FIP_SC_VN_BEACON: + desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) | + BIT(FIP_DT_VN_ID); + break; + case FIP_SC_VN_CLAIM_NOTIFY: + case FIP_SC_VN_CLAIM_REP: + desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) | + BIT(FIP_DT_VN_ID) | BIT(FIP_DT_FC4F) | + BIT(FIP_DT_FCOE_SIZE); + break; + default: + LIBFCOE_FIP_DBG(fip, "vn_parse unknown subcode %u\n", sub); + return -EINVAL; + } + + 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; + + dtype = desc->fip_dtype; + if (dtype < 32) { + if (!(desc_mask & BIT(dtype))) { + LIBFCOE_FIP_DBG(fip, + "unexpected or duplicated desc " + "desc type %u in " + "FIP VN2VN subtype %u\n", + dtype, sub); + return -EINVAL; + } + desc_mask &= ~BIT(dtype); + } + + switch (dtype) { + case FIP_DT_MAC: + if (dlen != sizeof(struct fip_mac_desc)) + goto len_err; + macd = (struct fip_mac_desc *)desc; + if (!is_valid_ether_addr(macd->fd_mac)) { + LIBFCOE_FIP_DBG(fip, + "Invalid MAC addr %pM in FIP VN2VN\n", + macd->fd_mac); + return -EINVAL; + } + memcpy(frport->enode_mac, macd->fd_mac, ETH_ALEN); + break; + case FIP_DT_NAME: + if (dlen != sizeof(struct fip_wwn_desc)) + goto len_err; + wwn = (struct fip_wwn_desc *)desc; + frport->rdata.ids.node_name = + get_unaligned_be64(&wwn->fd_wwn); + break; + case FIP_DT_VN_ID: + if (dlen != sizeof(struct fip_vn_desc)) + goto len_err; + vn = (struct fip_vn_desc *)desc; + memcpy(frport->vn_mac, vn->fd_mac, ETH_ALEN); + frport->rdata.ids.port_id = ntoh24(vn->fd_fc_id); + frport->rdata.ids.port_name = + get_unaligned_be64(&vn->fd_wwpn); + break; + case FIP_DT_FC4F: + if (dlen != sizeof(struct fip_fc4_feat)) + goto len_err; + break; + case FIP_DT_FCOE_SIZE: + if (dlen != sizeof(struct fip_size_desc)) + goto len_err; + size = (struct fip_size_desc *)desc; + frport->fcoe_len = ntohs(size->fd_size); + break; + default: + LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x " + "in FIP probe\n", dtype); + /* standard says ignore unknown descriptors >= 128 */ + if (dtype < FIP_DT_NON_CRITICAL) + return -EINVAL; + break; + } + desc = (struct fip_desc *)((char *)desc + dlen); + rlen -= dlen; + } + return 0; + +len_err: + LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n", + dtype, dlen); + return -EINVAL; +} + +/** + * fcoe_ctlr_vn_send_claim() - send multicast FIP VN2VN Claim Notification. + * @fip: The FCoE controller + * + * Called with ctlr_mutex held. + */ +static void fcoe_ctlr_vn_send_claim(struct fcoe_ctlr *fip) +{ + fcoe_ctlr_vn_send(fip, FIP_SC_VN_CLAIM_NOTIFY, fcoe_all_vn2vn, 0); + fip->sol_time = jiffies; +} + +/** + * fcoe_ctlr_vn_probe_req() - handle incoming VN2VN probe request. + * @fip: The FCoE controller + * @frport: parsed FCoE rport from the probe request + * + * Called with ctlr_mutex held. + */ +static void fcoe_ctlr_vn_probe_req(struct fcoe_ctlr *fip, + struct fcoe_rport *frport) +{ + if (frport->rdata.ids.port_id != fip->port_id) + return; + + switch (fip->state) { + case FIP_ST_VNMP_CLAIM: + case FIP_ST_VNMP_UP: + LIBFCOE_FIP_DBG(fip, "vn_probe_req: send reply, state %x\n", + fip->state); + fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REP, + frport->enode_mac, 0); + break; + case FIP_ST_VNMP_PROBE1: + case FIP_ST_VNMP_PROBE2: + /* + * Decide whether to reply to the Probe. + * Our selected address is never a "recorded" one, so + * only reply if our WWPN is greater and the + * Probe's REC bit is not set. + * If we don't reply, we will change our address. + */ + if (fip->lp->wwpn > frport->rdata.ids.port_name && + !(frport->flags & FIP_FL_REC_OR_P2P)) { + LIBFCOE_FIP_DBG(fip, "vn_probe_req: " + "port_id collision\n"); + fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REP, + frport->enode_mac, 0); + break; + } + fallthrough; + case FIP_ST_VNMP_START: + LIBFCOE_FIP_DBG(fip, "vn_probe_req: " + "restart VN2VN negotiation\n"); + fcoe_ctlr_vn_restart(fip); + break; + default: + LIBFCOE_FIP_DBG(fip, "vn_probe_req: ignore state %x\n", + fip->state); + break; + } +} + +/** + * fcoe_ctlr_vn_probe_reply() - handle incoming VN2VN probe reply. + * @fip: The FCoE controller + * @frport: parsed FCoE rport from the probe request + * + * Called with ctlr_mutex held. + */ +static void fcoe_ctlr_vn_probe_reply(struct fcoe_ctlr *fip, + struct fcoe_rport *frport) +{ + if (frport->rdata.ids.port_id != fip->port_id) + return; + switch (fip->state) { + case FIP_ST_VNMP_START: + case FIP_ST_VNMP_PROBE1: + case FIP_ST_VNMP_PROBE2: + case FIP_ST_VNMP_CLAIM: + LIBFCOE_FIP_DBG(fip, "vn_probe_reply: restart state %x\n", + fip->state); + fcoe_ctlr_vn_restart(fip); + break; + case FIP_ST_VNMP_UP: + LIBFCOE_FIP_DBG(fip, "vn_probe_reply: send claim notify\n"); + fcoe_ctlr_vn_send_claim(fip); + break; + default: + break; + } +} + +/** + * fcoe_ctlr_vn_add() - Add a VN2VN entry to the list, based on a claim reply. + * @fip: The FCoE controller + * @new: newly-parsed FCoE rport as a template for new rdata + * + * Called with ctlr_mutex held. + */ +static void fcoe_ctlr_vn_add(struct fcoe_ctlr *fip, struct fcoe_rport *new) +{ + struct fc_lport *lport = fip->lp; + struct fc_rport_priv *rdata; + struct fc_rport_identifiers *ids; + struct fcoe_rport *frport; + u32 port_id; + + port_id = new->rdata.ids.port_id; + if (port_id == fip->port_id) + return; + + mutex_lock(&lport->disc.disc_mutex); + rdata = fc_rport_create(lport, port_id); + if (!rdata) { + mutex_unlock(&lport->disc.disc_mutex); + return; + } + mutex_lock(&rdata->rp_mutex); + mutex_unlock(&lport->disc.disc_mutex); + + rdata->ops = &fcoe_ctlr_vn_rport_ops; + rdata->disc_id = lport->disc.disc_id; + + ids = &rdata->ids; + if ((ids->port_name != -1 && + ids->port_name != new->rdata.ids.port_name) || + (ids->node_name != -1 && + ids->node_name != new->rdata.ids.node_name)) { + mutex_unlock(&rdata->rp_mutex); + LIBFCOE_FIP_DBG(fip, "vn_add rport logoff %6.6x\n", port_id); + fc_rport_logoff(rdata); + mutex_lock(&rdata->rp_mutex); + } + ids->port_name = new->rdata.ids.port_name; + ids->node_name = new->rdata.ids.node_name; + mutex_unlock(&rdata->rp_mutex); + + frport = fcoe_ctlr_rport(rdata); + LIBFCOE_FIP_DBG(fip, "vn_add rport %6.6x %s state %d\n", + port_id, frport->fcoe_len ? "old" : "new", + rdata->rp_state); + frport->fcoe_len = new->fcoe_len; + frport->flags = new->flags; + frport->login_count = new->login_count; + memcpy(frport->enode_mac, new->enode_mac, ETH_ALEN); + memcpy(frport->vn_mac, new->vn_mac, ETH_ALEN); + frport->time = 0; +} + +/** + * fcoe_ctlr_vn_lookup() - Find VN remote port's MAC address + * @fip: The FCoE controller + * @port_id: The port_id of the remote VN_node + * @mac: buffer which will hold the VN_NODE destination MAC address, if found. + * + * Returns non-zero error if no remote port found. + */ +static int fcoe_ctlr_vn_lookup(struct fcoe_ctlr *fip, u32 port_id, u8 *mac) +{ + struct fc_lport *lport = fip->lp; + struct fc_rport_priv *rdata; + struct fcoe_rport *frport; + int ret = -1; + + rdata = fc_rport_lookup(lport, port_id); + if (rdata) { + frport = fcoe_ctlr_rport(rdata); + memcpy(mac, frport->enode_mac, ETH_ALEN); + ret = 0; + kref_put(&rdata->kref, fc_rport_destroy); + } + return ret; +} + +/** + * fcoe_ctlr_vn_claim_notify() - handle received FIP VN2VN Claim Notification + * @fip: The FCoE controller + * @new: newly-parsed FCoE rport as a template for new rdata + * + * Called with ctlr_mutex held. + */ +static void fcoe_ctlr_vn_claim_notify(struct fcoe_ctlr *fip, + struct fcoe_rport *new) +{ + if (new->flags & FIP_FL_REC_OR_P2P) { + LIBFCOE_FIP_DBG(fip, "send probe req for P2P/REC\n"); + fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0); + return; + } + switch (fip->state) { + case FIP_ST_VNMP_START: + case FIP_ST_VNMP_PROBE1: + case FIP_ST_VNMP_PROBE2: + if (new->rdata.ids.port_id == fip->port_id) { + LIBFCOE_FIP_DBG(fip, "vn_claim_notify: " + "restart, state %d\n", + fip->state); + fcoe_ctlr_vn_restart(fip); + } + break; + case FIP_ST_VNMP_CLAIM: + case FIP_ST_VNMP_UP: + if (new->rdata.ids.port_id == fip->port_id) { + if (new->rdata.ids.port_name > fip->lp->wwpn) { + LIBFCOE_FIP_DBG(fip, "vn_claim_notify: " + "restart, port_id collision\n"); + fcoe_ctlr_vn_restart(fip); + break; + } + LIBFCOE_FIP_DBG(fip, "vn_claim_notify: " + "send claim notify\n"); + fcoe_ctlr_vn_send_claim(fip); + break; + } + LIBFCOE_FIP_DBG(fip, "vn_claim_notify: send reply to %x\n", + new->rdata.ids.port_id); + fcoe_ctlr_vn_send(fip, FIP_SC_VN_CLAIM_REP, new->enode_mac, + min((u32)new->fcoe_len, + fcoe_ctlr_fcoe_size(fip))); + fcoe_ctlr_vn_add(fip, new); + break; + default: + LIBFCOE_FIP_DBG(fip, "vn_claim_notify: " + "ignoring claim from %x\n", + new->rdata.ids.port_id); + break; + } +} + +/** + * fcoe_ctlr_vn_claim_resp() - handle received Claim Response + * @fip: The FCoE controller that received the frame + * @new: newly-parsed FCoE rport from the Claim Response + * + * Called with ctlr_mutex held. + */ +static void fcoe_ctlr_vn_claim_resp(struct fcoe_ctlr *fip, + struct fcoe_rport *new) +{ + LIBFCOE_FIP_DBG(fip, "claim resp from from rport %x - state %s\n", + new->rdata.ids.port_id, fcoe_ctlr_state(fip->state)); + if (fip->state == FIP_ST_VNMP_UP || fip->state == FIP_ST_VNMP_CLAIM) + fcoe_ctlr_vn_add(fip, new); +} + +/** + * fcoe_ctlr_vn_beacon() - handle received beacon. + * @fip: The FCoE controller that received the frame + * @new: newly-parsed FCoE rport from the Beacon + * + * Called with ctlr_mutex held. + */ +static void fcoe_ctlr_vn_beacon(struct fcoe_ctlr *fip, + struct fcoe_rport *new) +{ + struct fc_lport *lport = fip->lp; + struct fc_rport_priv *rdata; + struct fcoe_rport *frport; + + if (new->flags & FIP_FL_REC_OR_P2P) { + LIBFCOE_FIP_DBG(fip, "p2p beacon while in vn2vn mode\n"); + fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0); + return; + } + rdata = fc_rport_lookup(lport, new->rdata.ids.port_id); + if (rdata) { + if (rdata->ids.node_name == new->rdata.ids.node_name && + rdata->ids.port_name == new->rdata.ids.port_name) { + frport = fcoe_ctlr_rport(rdata); + + LIBFCOE_FIP_DBG(fip, "beacon from rport %x\n", + rdata->ids.port_id); + if (!frport->time && fip->state == FIP_ST_VNMP_UP) { + LIBFCOE_FIP_DBG(fip, "beacon expired " + "for rport %x\n", + rdata->ids.port_id); + fc_rport_login(rdata); + } + frport->time = jiffies; + } + kref_put(&rdata->kref, fc_rport_destroy); + return; + } + if (fip->state != FIP_ST_VNMP_UP) + return; + + /* + * Beacon from a new neighbor. + * Send a claim notify if one hasn't been sent recently. + * Don't add the neighbor yet. + */ + LIBFCOE_FIP_DBG(fip, "beacon from new rport %x. sending claim notify\n", + new->rdata.ids.port_id); + if (time_after(jiffies, + fip->sol_time + msecs_to_jiffies(FIP_VN_ANN_WAIT))) + fcoe_ctlr_vn_send_claim(fip); +} + +/** + * fcoe_ctlr_vn_age() - Check for VN_ports without recent beacons + * @fip: The FCoE controller + * + * Called with ctlr_mutex held. + * Called only in state FIP_ST_VNMP_UP. + * Returns the soonest time for next age-out or a time far in the future. + */ +static unsigned long fcoe_ctlr_vn_age(struct fcoe_ctlr *fip) +{ + struct fc_lport *lport = fip->lp; + struct fc_rport_priv *rdata; + struct fcoe_rport *frport; + unsigned long next_time; + unsigned long deadline; + + next_time = jiffies + msecs_to_jiffies(FIP_VN_BEACON_INT * 10); + mutex_lock(&lport->disc.disc_mutex); + list_for_each_entry_rcu(rdata, &lport->disc.rports, peers) { + if (!kref_get_unless_zero(&rdata->kref)) + continue; + frport = fcoe_ctlr_rport(rdata); + if (!frport->time) { + kref_put(&rdata->kref, fc_rport_destroy); + continue; + } + deadline = frport->time + + msecs_to_jiffies(FIP_VN_BEACON_INT * 25 / 10); + if (time_after_eq(jiffies, deadline)) { + frport->time = 0; + LIBFCOE_FIP_DBG(fip, + "port %16.16llx fc_id %6.6x beacon expired\n", + rdata->ids.port_name, rdata->ids.port_id); + fc_rport_logoff(rdata); + } else if (time_before(deadline, next_time)) + next_time = deadline; + kref_put(&rdata->kref, fc_rport_destroy); + } + mutex_unlock(&lport->disc.disc_mutex); + return next_time; +} + +/** + * fcoe_ctlr_vn_recv() - 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. + * Always consumes the frame. + */ +static int fcoe_ctlr_vn_recv(struct fcoe_ctlr *fip, struct sk_buff *skb) +{ + struct fip_header *fiph; + enum fip_vn2vn_subcode sub; + struct fcoe_rport frport = { }; + int rc, vlan_id = 0; + + fiph = (struct fip_header *)skb->data; + sub = fiph->fip_subcode; + + if (fip->lp->vlan) + vlan_id = skb_vlan_tag_get_id(skb); + + if (vlan_id && vlan_id != fip->lp->vlan) { + LIBFCOE_FIP_DBG(fip, "vn_recv drop frame sub %x vlan %d\n", + sub, vlan_id); + rc = -EAGAIN; + goto drop; + } + + rc = fcoe_ctlr_vn_parse(fip, skb, &frport); + if (rc) { + LIBFCOE_FIP_DBG(fip, "vn_recv vn_parse error %d\n", rc); + goto drop; + } + + mutex_lock(&fip->ctlr_mutex); + switch (sub) { + case FIP_SC_VN_PROBE_REQ: + fcoe_ctlr_vn_probe_req(fip, &frport); + break; + case FIP_SC_VN_PROBE_REP: + fcoe_ctlr_vn_probe_reply(fip, &frport); + break; + case FIP_SC_VN_CLAIM_NOTIFY: + fcoe_ctlr_vn_claim_notify(fip, &frport); + break; + case FIP_SC_VN_CLAIM_REP: + fcoe_ctlr_vn_claim_resp(fip, &frport); + break; + case FIP_SC_VN_BEACON: + fcoe_ctlr_vn_beacon(fip, &frport); + break; + default: + LIBFCOE_FIP_DBG(fip, "vn_recv unknown subcode %d\n", sub); + rc = -1; + break; + } + mutex_unlock(&fip->ctlr_mutex); +drop: + kfree_skb(skb); + return rc; +} + +/** + * fcoe_ctlr_vlan_parse - parse vlan discovery request or response + * @fip: The FCoE controller + * @skb: incoming packet + * @frport: parsed FCoE rport from the probe request + * + * Returns non-zero error number on error. + * Does not consume the packet. + */ +static int fcoe_ctlr_vlan_parse(struct fcoe_ctlr *fip, + struct sk_buff *skb, + struct fcoe_rport *frport) +{ + struct fip_header *fiph; + struct fip_desc *desc = NULL; + struct fip_mac_desc *macd = NULL; + struct fip_wwn_desc *wwn = NULL; + size_t rlen; + size_t dlen; + u32 desc_mask = 0; + u32 dtype; + u8 sub; + + fiph = (struct fip_header *)skb->data; + frport->flags = ntohs(fiph->fip_flags); + + sub = fiph->fip_subcode; + switch (sub) { + case FIP_SC_VL_REQ: + desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME); + break; + default: + LIBFCOE_FIP_DBG(fip, "vn_parse unknown subcode %u\n", sub); + return -EINVAL; + } + + 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; + + dtype = desc->fip_dtype; + if (dtype < 32) { + if (!(desc_mask & BIT(dtype))) { + LIBFCOE_FIP_DBG(fip, + "unexpected or duplicated desc " + "desc type %u in " + "FIP VN2VN subtype %u\n", + dtype, sub); + return -EINVAL; + } + desc_mask &= ~BIT(dtype); + } + + switch (dtype) { + case FIP_DT_MAC: + if (dlen != sizeof(struct fip_mac_desc)) + goto len_err; + macd = (struct fip_mac_desc *)desc; + if (!is_valid_ether_addr(macd->fd_mac)) { + LIBFCOE_FIP_DBG(fip, + "Invalid MAC addr %pM in FIP VN2VN\n", + macd->fd_mac); + return -EINVAL; + } + memcpy(frport->enode_mac, macd->fd_mac, ETH_ALEN); + break; + case FIP_DT_NAME: + if (dlen != sizeof(struct fip_wwn_desc)) + goto len_err; + wwn = (struct fip_wwn_desc *)desc; + frport->rdata.ids.node_name = + get_unaligned_be64(&wwn->fd_wwn); + break; + default: + LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x " + "in FIP probe\n", dtype); + /* standard says ignore unknown descriptors >= 128 */ + if (dtype < FIP_DT_NON_CRITICAL) + return -EINVAL; + break; + } + desc = (struct fip_desc *)((char *)desc + dlen); + rlen -= dlen; + } + return 0; + +len_err: + LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n", + dtype, dlen); + return -EINVAL; +} + +/** + * fcoe_ctlr_vlan_send() - Send a FIP VLAN Notification + * @fip: The FCoE controller + * @sub: sub-opcode for vlan notification or vn2vn vlan notification + * @dest: The destination Ethernet MAC address + */ +static void fcoe_ctlr_vlan_send(struct fcoe_ctlr *fip, + enum fip_vlan_subcode sub, + const u8 *dest) +{ + struct sk_buff *skb; + struct fip_vlan_notify_frame { + struct ethhdr eth; + struct fip_header fip; + struct fip_mac_desc mac; + struct fip_vlan_desc vlan; + } __packed * frame; + size_t len; + size_t dlen; + + len = sizeof(*frame); + dlen = sizeof(frame->mac) + sizeof(frame->vlan); + len = max(len, sizeof(struct ethhdr)); + + skb = dev_alloc_skb(len); + if (!skb) + return; + + LIBFCOE_FIP_DBG(fip, "fip %s vlan notification, vlan %d\n", + fip->mode == FIP_MODE_VN2VN ? "vn2vn" : "fcf", + fip->lp->vlan); + + frame = (struct fip_vlan_notify_frame *)skb->data; + memset(frame, 0, len); + memcpy(frame->eth.h_dest, dest, ETH_ALEN); + + memcpy(frame->eth.h_source, fip->ctl_src_addr, ETH_ALEN); + frame->eth.h_proto = htons(ETH_P_FIP); + + frame->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER); + frame->fip.fip_op = htons(FIP_OP_VLAN); + frame->fip.fip_subcode = sub; + frame->fip.fip_dl_len = htons(dlen / FIP_BPW); + + frame->mac.fd_desc.fip_dtype = FIP_DT_MAC; + frame->mac.fd_desc.fip_dlen = sizeof(frame->mac) / FIP_BPW; + memcpy(frame->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN); + + frame->vlan.fd_desc.fip_dtype = FIP_DT_VLAN; + frame->vlan.fd_desc.fip_dlen = sizeof(frame->vlan) / FIP_BPW; + put_unaligned_be16(fip->lp->vlan, &frame->vlan.fd_vlan); + + skb_put(skb, len); + skb->protocol = htons(ETH_P_FIP); + skb->priority = fip->priority; + skb_reset_mac_header(skb); + skb_reset_network_header(skb); + + fip->send(fip, skb); +} + +/** + * fcoe_ctlr_vlan_disc_reply() - send FIP VLAN Discovery Notification. + * @fip: The FCoE controller + * @frport: The newly-parsed FCoE rport from the Discovery Request + * + * Called with ctlr_mutex held. + */ +static void fcoe_ctlr_vlan_disc_reply(struct fcoe_ctlr *fip, + struct fcoe_rport *frport) +{ + enum fip_vlan_subcode sub = FIP_SC_VL_NOTE; + + if (fip->mode == FIP_MODE_VN2VN) + sub = FIP_SC_VL_VN2VN_NOTE; + + fcoe_ctlr_vlan_send(fip, sub, frport->enode_mac); +} + +/** + * fcoe_ctlr_vlan_recv - vlan request receive handler for VN2VN mode. + * @fip: The FCoE controller + * @skb: The received FIP packet + */ +static int fcoe_ctlr_vlan_recv(struct fcoe_ctlr *fip, struct sk_buff *skb) +{ + struct fip_header *fiph; + enum fip_vlan_subcode sub; + struct fcoe_rport frport = { }; + int rc; + + fiph = (struct fip_header *)skb->data; + sub = fiph->fip_subcode; + rc = fcoe_ctlr_vlan_parse(fip, skb, &frport); + if (rc) { + LIBFCOE_FIP_DBG(fip, "vlan_recv vlan_parse error %d\n", rc); + goto drop; + } + mutex_lock(&fip->ctlr_mutex); + if (sub == FIP_SC_VL_REQ) + fcoe_ctlr_vlan_disc_reply(fip, &frport); + mutex_unlock(&fip->ctlr_mutex); + +drop: + kfree_skb(skb); + return rc; +} + +/** + * fcoe_ctlr_disc_recv - discovery receive handler for VN2VN mode. + * @lport: The local port + * @fp: The received frame + * + * This should never be called since we don't see RSCNs or other + * fabric-generated ELSes. + */ +static void fcoe_ctlr_disc_recv(struct fc_lport *lport, struct fc_frame *fp) +{ + struct fc_seq_els_data rjt_data; + + rjt_data.reason = ELS_RJT_UNSUP; + rjt_data.explan = ELS_EXPL_NONE; + fc_seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data); + fc_frame_free(fp); +} + +/* + * fcoe_ctlr_disc_start - start discovery for VN2VN mode. + * + * This sets a flag indicating that remote ports should be created + * and started for the peers we discover. We use the disc_callback + * pointer as that flag. Peers already discovered are created here. + * + * The lport lock is held during this call. The callback must be done + * later, without holding either the lport or discovery locks. + * The fcoe_ctlr lock may also be held during this call. + */ +static void fcoe_ctlr_disc_start(void (*callback)(struct fc_lport *, + enum fc_disc_event), + struct fc_lport *lport) +{ + struct fc_disc *disc = &lport->disc; + struct fcoe_ctlr *fip = disc->priv; + + mutex_lock(&disc->disc_mutex); + disc->disc_callback = callback; + disc->disc_id = (disc->disc_id + 2) | 1; + disc->pending = 1; + schedule_work(&fip->timer_work); + mutex_unlock(&disc->disc_mutex); +} + +/** + * fcoe_ctlr_vn_disc() - report FIP VN_port discovery results after claim state. + * @fip: The FCoE controller + * + * Starts the FLOGI and PLOGI login process to each discovered rport for which + * we've received at least one beacon. + * Performs the discovery complete callback. + */ +static void fcoe_ctlr_vn_disc(struct fcoe_ctlr *fip) +{ + struct fc_lport *lport = fip->lp; + struct fc_disc *disc = &lport->disc; + struct fc_rport_priv *rdata; + struct fcoe_rport *frport; + void (*callback)(struct fc_lport *, enum fc_disc_event); + + mutex_lock(&disc->disc_mutex); + callback = disc->pending ? disc->disc_callback : NULL; + disc->pending = 0; + list_for_each_entry_rcu(rdata, &disc->rports, peers) { + if (!kref_get_unless_zero(&rdata->kref)) + continue; + frport = fcoe_ctlr_rport(rdata); + if (frport->time) + fc_rport_login(rdata); + kref_put(&rdata->kref, fc_rport_destroy); + } + mutex_unlock(&disc->disc_mutex); + if (callback) + callback(lport, DISC_EV_SUCCESS); +} + +/** + * fcoe_ctlr_vn_timeout - timer work function for VN2VN mode. + * @fip: The FCoE controller + */ +static void fcoe_ctlr_vn_timeout(struct fcoe_ctlr *fip) +{ + unsigned long next_time; + u8 mac[ETH_ALEN]; + u32 new_port_id = 0; + + mutex_lock(&fip->ctlr_mutex); + switch (fip->state) { + case FIP_ST_VNMP_START: + fcoe_ctlr_set_state(fip, FIP_ST_VNMP_PROBE1); + LIBFCOE_FIP_DBG(fip, "vn_timeout: send 1st probe request\n"); + fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0); + next_time = jiffies + msecs_to_jiffies(FIP_VN_PROBE_WAIT); + break; + case FIP_ST_VNMP_PROBE1: + fcoe_ctlr_set_state(fip, FIP_ST_VNMP_PROBE2); + LIBFCOE_FIP_DBG(fip, "vn_timeout: send 2nd probe request\n"); + fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0); + next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT); + break; + case FIP_ST_VNMP_PROBE2: + fcoe_ctlr_set_state(fip, FIP_ST_VNMP_CLAIM); + new_port_id = fip->port_id; + hton24(mac, FIP_VN_FC_MAP); + hton24(mac + 3, new_port_id); + fcoe_ctlr_map_dest(fip); + fip->update_mac(fip->lp, mac); + LIBFCOE_FIP_DBG(fip, "vn_timeout: send claim notify\n"); + fcoe_ctlr_vn_send_claim(fip); + next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT); + break; + case FIP_ST_VNMP_CLAIM: + /* + * This may be invoked either by starting discovery so don't + * go to the next state unless it's been long enough. + */ + next_time = fip->sol_time + msecs_to_jiffies(FIP_VN_ANN_WAIT); + if (time_after_eq(jiffies, next_time)) { + fcoe_ctlr_set_state(fip, FIP_ST_VNMP_UP); + LIBFCOE_FIP_DBG(fip, "vn_timeout: send vn2vn beacon\n"); + fcoe_ctlr_vn_send(fip, FIP_SC_VN_BEACON, + fcoe_all_vn2vn, 0); + next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT); + fip->port_ka_time = next_time; + } + fcoe_ctlr_vn_disc(fip); + break; + case FIP_ST_VNMP_UP: + next_time = fcoe_ctlr_vn_age(fip); + if (time_after_eq(jiffies, fip->port_ka_time)) { + LIBFCOE_FIP_DBG(fip, "vn_timeout: send vn2vn beacon\n"); + fcoe_ctlr_vn_send(fip, FIP_SC_VN_BEACON, + fcoe_all_vn2vn, 0); + fip->port_ka_time = jiffies + + msecs_to_jiffies(FIP_VN_BEACON_INT + + prandom_u32_max(FIP_VN_BEACON_FUZZ)); + } + if (time_before(fip->port_ka_time, next_time)) + next_time = fip->port_ka_time; + break; + case FIP_ST_LINK_WAIT: + goto unlock; + default: + WARN(1, "unexpected state %d\n", fip->state); + goto unlock; + } + mod_timer(&fip->timer, next_time); +unlock: + mutex_unlock(&fip->ctlr_mutex); + + /* If port ID is new, notify local port after dropping ctlr_mutex */ + if (new_port_id) + fc_lport_set_local_id(fip->lp, new_port_id); +} + +/** + * fcoe_ctlr_mode_set() - Set or reset the ctlr's mode + * @lport: The local port to be (re)configured + * @fip: The FCoE controller whose mode is changing + * @fip_mode: The new fip mode + * + * Note that the we shouldn't be changing the libfc discovery settings + * (fc_disc_config) while an lport is going through the libfc state + * machine. The mode can only be changed when a fcoe_ctlr device is + * disabled, so that should ensure that this routine is only called + * when nothing is happening. + */ +static void fcoe_ctlr_mode_set(struct fc_lport *lport, struct fcoe_ctlr *fip, + enum fip_mode fip_mode) +{ + void *priv; + + WARN_ON(lport->state != LPORT_ST_RESET && + lport->state != LPORT_ST_DISABLED); + + if (fip_mode == FIP_MODE_VN2VN) { + lport->rport_priv_size = sizeof(struct fcoe_rport); + lport->point_to_multipoint = 1; + lport->tt.disc_recv_req = fcoe_ctlr_disc_recv; + lport->tt.disc_start = fcoe_ctlr_disc_start; + lport->tt.disc_stop = fcoe_ctlr_disc_stop; + lport->tt.disc_stop_final = fcoe_ctlr_disc_stop_final; + priv = fip; + } else { + lport->rport_priv_size = 0; + lport->point_to_multipoint = 0; + lport->tt.disc_recv_req = NULL; + lport->tt.disc_start = NULL; + lport->tt.disc_stop = NULL; + lport->tt.disc_stop_final = NULL; + priv = lport; + } + + fc_disc_config(lport, priv); +} + +/** + * fcoe_libfc_config() - Sets up libfc related properties for local port + * @lport: The local port to configure libfc for + * @fip: The FCoE controller in use by the local port + * @tt: The libfc function template + * @init_fcp: If non-zero, the FCP portion of libfc should be initialized + * + * Returns : 0 for success + */ +int fcoe_libfc_config(struct fc_lport *lport, struct fcoe_ctlr *fip, + const struct libfc_function_template *tt, int init_fcp) +{ + /* Set the function pointers set by the LLDD */ + memcpy(&lport->tt, tt, sizeof(*tt)); + if (init_fcp && fc_fcp_init(lport)) + return -ENOMEM; + fc_exch_init(lport); + fc_elsct_init(lport); + fc_lport_init(lport); + fc_disc_init(lport); + fcoe_ctlr_mode_set(lport, fip, fip->mode); + return 0; +} +EXPORT_SYMBOL_GPL(fcoe_libfc_config); + +void fcoe_fcf_get_selected(struct fcoe_fcf_device *fcf_dev) +{ + struct fcoe_ctlr_device *ctlr_dev = fcoe_fcf_dev_to_ctlr_dev(fcf_dev); + struct fcoe_ctlr *fip = fcoe_ctlr_device_priv(ctlr_dev); + struct fcoe_fcf *fcf; + + mutex_lock(&fip->ctlr_mutex); + mutex_lock(&ctlr_dev->lock); + + fcf = fcoe_fcf_device_priv(fcf_dev); + if (fcf) + fcf_dev->selected = (fcf == fip->sel_fcf) ? 1 : 0; + else + fcf_dev->selected = 0; + + mutex_unlock(&ctlr_dev->lock); + mutex_unlock(&fip->ctlr_mutex); +} +EXPORT_SYMBOL(fcoe_fcf_get_selected); + +void fcoe_ctlr_set_fip_mode(struct fcoe_ctlr_device *ctlr_dev) +{ + struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev); + struct fc_lport *lport = ctlr->lp; + + mutex_lock(&ctlr->ctlr_mutex); + switch (ctlr_dev->mode) { + case FIP_CONN_TYPE_VN2VN: + ctlr->mode = FIP_MODE_VN2VN; + break; + case FIP_CONN_TYPE_FABRIC: + default: + ctlr->mode = FIP_MODE_FABRIC; + break; + } + + mutex_unlock(&ctlr->ctlr_mutex); + + fcoe_ctlr_mode_set(lport, ctlr, ctlr->mode); +} +EXPORT_SYMBOL(fcoe_ctlr_set_fip_mode); |