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OpenCloudOS-Kernel/drivers/scsi/fcoe/libfcoe.c

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/*
* 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 <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/netdevice.h>
#include <linux/errno.h>
#include <linux/bitops.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/libfc.h>
#include <scsi/libfcoe.h>
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_link_work(struct work_struct *);
static void fcoe_ctlr_recv_work(struct work_struct *);
static u8 fcoe_all_fcfs[ETH_ALEN] = FIP_ALL_FCF_MACS;
static u32 fcoe_ctlr_debug; /* 1 for basic, 2 for noisy debug */
#define FIP_DBG_LVL(level, fmt, args...) \
do { \
if (fcoe_ctlr_debug >= (level)) \
FC_DBG(fmt, ##args); \
} while (0)
#define FIP_DBG(fmt, args...) FIP_DBG_LVL(1, fmt, ##args)
/*
* 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;
}
/*
* 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: FCoE controller.
*/
void fcoe_ctlr_init(struct fcoe_ctlr *fip)
{
fip->state = FIP_ST_LINK_WAIT;
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->link_work, fcoe_ctlr_link_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: FCoE controller.
*
* 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_ctrl_destroy() - Disable and tear-down the FCoE controller.
* @fip: FCoE controller.
*
* 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)
{
flush_work(&fip->recv_work);
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);
flush_work(&fip->link_work);
}
EXPORT_SYMBOL(fcoe_ctlr_destroy);
/**
* fcoe_ctlr_fcoe_size() - Return the maximum FCoE size required for VN_Port.
* @fip: FCoE controller.
*
* 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 solicitation.
* @fip: FCoE controller.
* @fcf: 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);
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_802_3);
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: FCoE controller.
*
* 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) {
fip->last_link = 1;
fip->link = 1;
spin_unlock_bh(&fip->lock);
fc_linkup(fip->lp);
} else if (fip->state == FIP_ST_LINK_WAIT) {
fip->state = FIP_ST_AUTO;
fip->last_link = 1;
fip->link = 1;
spin_unlock_bh(&fip->lock);
FIP_DBG("%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 FIP.
* @fip: FCoE controller.
* @new_state: FIP state to be entered.
*
* Returns non-zero if the link was up and now isn't.
*/
static int fcoe_ctlr_reset(struct fcoe_ctlr *fip, enum fip_state new_state)
{
struct fc_lport *lp = fip->lp;
int link_dropped;
spin_lock_bh(&fip->lock);
fcoe_ctlr_reset_fcfs(fip);
del_timer(&fip->timer);
fip->state = new_state;
fip->ctlr_ka_time = 0;
fip->port_ka_time = 0;
fip->sol_time = 0;
fip->flogi_oxid = FC_XID_UNKNOWN;
fip->map_dest = 0;
fip->last_link = 0;
link_dropped = fip->link;
fip->link = 0;
spin_unlock_bh(&fip->lock);
if (link_dropped)
fc_linkdown(lp);
if (new_state == FIP_ST_ENABLED) {
fcoe_ctlr_solicit(fip, NULL);
fc_linkup(lp);
link_dropped = 0;
}
return link_dropped;
}
/**
* fcoe_ctlr_link_down() - Stop FCoE controller.
* @fip: FCoE controller.
*
* 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)
{
return fcoe_ctlr_reset(fip, FIP_ST_LINK_WAIT);
}
EXPORT_SYMBOL(fcoe_ctlr_link_down);
/**
* fcoe_ctlr_send_keep_alive() - Send a keep-alive to the selected FCF.
* @fip: FCoE controller.
* @ports: 0 for controller keep-alive, 1 for port keep-alive.
* @sa: 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, 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 || !fc_host_port_id(lp->host))
return;
len = fcoe_ctlr_fcoe_size(fip) + sizeof(struct ethhdr);
BUG_ON(len < sizeof(*kal) + 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);
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->data_src_addr, ETH_ALEN);
hton24(vn->fd_fc_id, fc_host_port_id(lp->host));
put_unaligned_be64(lp->wwpn, &vn->fd_wwpn);
}
skb_put(skb, len);
skb->protocol = htons(ETH_P_802_3);
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: FCoE controller.
* @dtype: FIP descriptor type for the frame.
* @skb: 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,
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;
fcf = fip->sel_fcf;
if (!fcf)
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_FL_FPMA);
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 != ELS_FLOGI)
memcpy(mac->fd_mac, fip->data_src_addr, ETH_ALEN);
skb->protocol = htons(ETH_P_802_3);
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.
* @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 sk_buff *skb)
{
struct fc_frame_header *fh;
u16 old_xid;
u8 op;
if (fip->state == FIP_ST_NON_FIP)
return 0;
fh = (struct fc_frame_header *)skb->data;
op = *(u8 *)(fh + 1);
switch (op) {
case 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;
}
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(fip->data_src_addr, fh->fh_s_id);
return 0;
default:
if (fip->state != FIP_ST_ENABLED)
goto drop;
return 0;
}
if (fcoe_ctlr_encaps(fip, 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: FCoE controller.
*
* Called with lock held.
*
* 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.
*/
static void fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip)
{
struct fcoe_fcf *fcf;
struct fcoe_fcf *next;
unsigned long sel_time = 0;
list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
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);
} 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.
* @skb: received FIP advertisement frame
* @fcf: resulting FCF entry.
*
* Returns zero on a valid parsed advertisement,
* otherwise returns non zero value.
*/
static int fcoe_ctlr_parse_adv(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)) {
FIP_DBG("invalid MAC addr 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;
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:
FIP_DBG("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:
FIP_DBG("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: FCoE controller.
* @skb: 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(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;
FIP_DBG_LVL(found ? 2 : 1, "%s FCF for fab %llx map %x val %d\n",
found ? "old" : "new",
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: FCoE controller.
* @skb: Received FIP packet.
*/
static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
struct fc_lport *lp = fip->lp;
struct fip_header *fiph;
struct fc_frame *fp;
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)) {
FIP_DBG("invalid MAC addrs in FIP ELS\n");
goto drop;
}
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:
FIP_DBG("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;
fip->update_mac(fip, fip->data_src_addr, granted_mac);
memcpy(fip->data_src_addr, granted_mac, ETH_ALEN);
}
/*
* 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) = lp;
stats = fc_lport_get_stats(lp);
stats->RxFrames++;
stats->RxWords += skb->len / FIP_BPW;
fc_exch_recv(lp, lp->emp, fp);
return;
len_err:
FIP_DBG("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: FCoE controller.
* @fh: 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 *lp = fip->lp;
u32 desc_mask;
FIP_DBG("Clear Virtual Link received\n");
if (!fcf)
return;
if (!fcf || !fc_host_port_id(lp->host))
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->data_src_addr) == 0 &&
get_unaligned_be64(&vp->fd_wwpn) == lp->wwpn &&
ntoh24(vp->fd_fc_id) == fc_host_port_id(lp->host))
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) {
FIP_DBG("missing descriptors mask %x\n", desc_mask);
} else {
FIP_DBG("performing Clear Virtual Link\n");
fcoe_ctlr_reset(fip, FIP_ST_ENABLED);
}
}
/**
* fcoe_ctlr_recv() - Receive a FIP frame.
* @fip: FCoE controller.
* @skb: Received FIP packet.
*
* This is called from NET_RX_SOFTIRQ.
*/
void fcoe_ctlr_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
spin_lock_bh(&fip->fip_recv_list.lock);
__skb_queue_tail(&fip->fip_recv_list, skb);
spin_unlock_bh(&fip->fip_recv_list.lock);
schedule_work(&fip->recv_work);
}
EXPORT_SYMBOL(fcoe_ctlr_recv);
/**
* fcoe_ctlr_recv_handler() - Receive a FIP frame.
* @fip: FCoE controller.
* @skb: Received FIP packet.
*
* 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;
FIP_DBG_LVL(2, "ver %x op %x/%x dl %x fl %x\n",
FIP_VER_DECAPS(fiph->fip_ver), op, sub,
ntohs(fiph->fip_dl_len), ntohs(fiph->fip_flags));
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;
FIP_DBG("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: 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) {
FIP_DBG("consider FCF for fab %llx 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)) {
FIP_DBG("FCF for fab %llx 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) {
FIP_DBG("conflicting fabric, VFID, or FC-MAP\n");
return;
}
if (fcf->pri < best->pri)
best = fcf;
}
fip->sel_fcf = best;
}
/**
* fcoe_ctlr_timeout() - FIP timer function.
* @arg: &fcoe_ctlr pointer.
*
* 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);
DECLARE_MAC_BUF(buf);
u8 send_ctlr_ka;
u8 send_port_ka;
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 "host%d: FIP selected "
"Fibre-Channel Forwarder MAC %s\n",
fip->lp->host->host_no,
print_mac(buf, 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;
fip->link = 1;
} else {
printk(KERN_NOTICE "host%d: "
"FIP Fibre-Channel Forwarder timed out. "
"Starting FCF discovery.\n",
fip->lp->host->host_no);
fip->link = 0;
}
schedule_work(&fip->link_work);
}
send_ctlr_ka = 0;
send_port_ka = 0;
if (sel) {
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;
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);
}
spin_unlock_bh(&fip->lock);
if (send_ctlr_ka)
fcoe_ctlr_send_keep_alive(fip, 0, fip->ctl_src_addr);
if (send_port_ka)
fcoe_ctlr_send_keep_alive(fip, 1, fip->data_src_addr);
}
/**
* fcoe_ctlr_link_work() - worker thread function for link changes.
* @work: pointer to link_work member inside &fcoe_ctlr.
*
* See if the link status has changed and if so, report it.
*
* This is here because fc_linkup() and fc_linkdown() must not
* be called from the timer directly, since they use a mutex.
*/
static void fcoe_ctlr_link_work(struct work_struct *work)
{
struct fcoe_ctlr *fip;
int link;
int last_link;
fip = container_of(work, struct fcoe_ctlr, link_work);
spin_lock_bh(&fip->lock);
last_link = fip->last_link;
link = fip->link;
fip->last_link = link;
spin_unlock_bh(&fip->lock);
if (last_link != link) {
if (link)
fc_linkup(fip->lp);
else
fcoe_ctlr_reset(fip, FIP_ST_LINK_WAIT);
}
}
/**
* fcoe_ctlr_recv_work() - Worker thread function for receiving FIP frames.
* @recv_work: pointer to recv_work member inside &fcoe_ctlr.
*/
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);
spin_lock_bh(&fip->fip_recv_list.lock);
while ((skb = __skb_dequeue(&fip->fip_recv_list))) {
spin_unlock_bh(&fip->fip_recv_list.lock);
fcoe_ctlr_recv_handler(fip, skb);
spin_lock_bh(&fip->fip_recv_list.lock);
}
spin_unlock_bh(&fip->fip_recv_list.lock);
}
/**
* fcoe_ctlr_recv_flogi() - snoop Pre-FIP receipt of FLOGI response or request.
* @fip: FCoE controller.
* @fp: FC frame.
* @sa: Ethernet source MAC address from received FCoE frame.
*
* 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.
*
* Return non-zero if the frame should not be delivered to libfc.
*/
int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *fip, struct fc_frame *fp, u8 *sa)
{
struct fc_frame_header *fh;
u8 op;
u8 mac[ETH_ALEN];
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;
FIP_DBG("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;
memcpy(mac, fip->data_src_addr, ETH_ALEN);
fc_fcoe_set_mac(fip->data_src_addr, fh->fh_d_id);
spin_unlock_bh(&fip->lock);
fip->update_mac(fip, mac, fip->data_src_addr);
} 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_NON_FIP)
FIP_DBG("received FLOGI REQ, "
"using 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 48-bit IEEE MAC address to 64-bit FC WWN.
* @mac: mac address
* @scheme: check port
* @port: 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 lport
* @lp: ptr to the fc_lport
* @tt: libfc function template
*
* Returns : 0 for success
*/
int fcoe_libfc_config(struct fc_lport *lp, struct libfc_function_template *tt)
{
/* Set the function pointers set by the LLDD */
memcpy(&lp->tt, tt, sizeof(*tt));
if (fc_fcp_init(lp))
return -ENOMEM;
fc_exch_init(lp);
fc_elsct_init(lp);
fc_lport_init(lp);
fc_rport_init(lp);
fc_disc_init(lp);
return 0;
}
EXPORT_SYMBOL_GPL(fcoe_libfc_config);
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