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googlers / maze / linux / 18240904960a39e582ced8ba8ececb10b8c22dd3 / . / drivers / scsi / fcoe / fcoe.c
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/*
* Copyright(c) 2007 - 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/module.h>
#include <linux/version.h>
#include <linux/spinlock.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/crc32.h>
#include <linux/cpu.h>
#include <linux/fs.h>
#include <linux/sysfs.h>
#include <linux/ctype.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsicam.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_fc.h>
#include <net/rtnetlink.h>
#include <scsi/fc/fc_encaps.h>
#include <scsi/fc/fc_fip.h>
#include <scsi/libfc.h>
#include <scsi/fc_frame.h>
#include <scsi/libfcoe.h>
#include "fcoe.h"
MODULE_AUTHOR("Open-FCoE.org");
MODULE_DESCRIPTION("FCoE");
MODULE_LICENSE("GPL v2");
/* Performance tuning parameters for fcoe */
static unsigned int fcoe_ddp_min;
module_param_named(ddp_min, fcoe_ddp_min, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(ddp_min, "Minimum I/O size in bytes for " \
"Direct Data Placement (DDP).");
DEFINE_MUTEX(fcoe_config_mutex);
/* fcoe_percpu_clean completion. Waiter protected by fcoe_create_mutex */
static DECLARE_COMPLETION(fcoe_flush_completion);
/* fcoe host list */
/* must only by accessed under the RTNL mutex */
LIST_HEAD(fcoe_hostlist);
DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu);
/* Function Prototypes */
static int fcoe_reset(struct Scsi_Host *shost);
static int fcoe_xmit(struct fc_lport *, struct fc_frame *);
static int fcoe_rcv(struct sk_buff *, struct net_device *,
struct packet_type *, struct net_device *);
static int fcoe_percpu_receive_thread(void *arg);
static void fcoe_clean_pending_queue(struct fc_lport *lp);
static void fcoe_percpu_clean(struct fc_lport *lp);
static int fcoe_link_ok(struct fc_lport *lp);
static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *);
static int fcoe_hostlist_add(const struct fc_lport *);
static void fcoe_check_wait_queue(struct fc_lport *, struct sk_buff *);
static int fcoe_device_notification(struct notifier_block *, ulong, void *);
static void fcoe_dev_setup(void);
static void fcoe_dev_cleanup(void);
static struct fcoe_interface *
fcoe_hostlist_lookup_port(const struct net_device *dev);
/* notification function from net device */
static struct notifier_block fcoe_notifier = {
.notifier_call = fcoe_device_notification,
};
static struct scsi_transport_template *scsi_transport_fcoe_sw;
struct fc_function_template fcoe_transport_function = {
.show_host_node_name = 1,
.show_host_port_name = 1,
.show_host_supported_classes = 1,
.show_host_supported_fc4s = 1,
.show_host_active_fc4s = 1,
.show_host_maxframe_size = 1,
.show_host_port_id = 1,
.show_host_supported_speeds = 1,
.get_host_speed = fc_get_host_speed,
.show_host_speed = 1,
.show_host_port_type = 1,
.get_host_port_state = fc_get_host_port_state,
.show_host_port_state = 1,
.show_host_symbolic_name = 1,
.dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
.show_rport_maxframe_size = 1,
.show_rport_supported_classes = 1,
.show_host_fabric_name = 1,
.show_starget_node_name = 1,
.show_starget_port_name = 1,
.show_starget_port_id = 1,
.set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
.show_rport_dev_loss_tmo = 1,
.get_fc_host_stats = fc_get_host_stats,
.issue_fc_host_lip = fcoe_reset,
.terminate_rport_io = fc_rport_terminate_io,
};
static struct scsi_host_template fcoe_shost_template = {
.module = THIS_MODULE,
.name = "FCoE Driver",
.proc_name = FCOE_NAME,
.queuecommand = fc_queuecommand,
.eh_abort_handler = fc_eh_abort,
.eh_device_reset_handler = fc_eh_device_reset,
.eh_host_reset_handler = fc_eh_host_reset,
.slave_alloc = fc_slave_alloc,
.change_queue_depth = fc_change_queue_depth,
.change_queue_type = fc_change_queue_type,
.this_id = -1,
.cmd_per_lun = 32,
.can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
.use_clustering = ENABLE_CLUSTERING,
.sg_tablesize = SG_ALL,
.max_sectors = 0xffff,
};
static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *ptype,
struct net_device *orig_dev);
/**
* fcoe_interface_setup()
* @fcoe: new fcoe_interface
* @netdev : ptr to the associated netdevice struct
*
* Returns : 0 for success
* Locking: must be called with the RTNL mutex held
*/
static int fcoe_interface_setup(struct fcoe_interface *fcoe,
struct net_device *netdev)
{
struct fcoe_ctlr *fip = &fcoe->ctlr;
struct netdev_hw_addr *ha;
u8 flogi_maddr[ETH_ALEN];
fcoe->netdev = netdev;
/* Do not support for bonding device */
if ((netdev->priv_flags & IFF_MASTER_ALB) ||
(netdev->priv_flags & IFF_SLAVE_INACTIVE) ||
(netdev->priv_flags & IFF_MASTER_8023AD)) {
return -EOPNOTSUPP;
}
/* look for SAN MAC address, if multiple SAN MACs exist, only
* use the first one for SPMA */
rcu_read_lock();
for_each_dev_addr(netdev, ha) {
if ((ha->type == NETDEV_HW_ADDR_T_SAN) &&
(is_valid_ether_addr(fip->ctl_src_addr))) {
memcpy(fip->ctl_src_addr, ha->addr, ETH_ALEN);
fip->spma = 1;
break;
}
}
rcu_read_unlock();
/* setup Source Mac Address */
if (!fip->spma)
memcpy(fip->ctl_src_addr, netdev->dev_addr, netdev->addr_len);
/*
* Add FCoE MAC address as second unicast MAC address
* or enter promiscuous mode if not capable of listening
* for multiple unicast MACs.
*/
memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
dev_unicast_add(netdev, flogi_maddr);
if (fip->spma)
dev_unicast_add(netdev, fip->ctl_src_addr);
dev_mc_add(netdev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0);
/*
* setup the receive function from ethernet driver
* on the ethertype for the given device
*/
fcoe->fcoe_packet_type.func = fcoe_rcv;
fcoe->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE);
fcoe->fcoe_packet_type.dev = netdev;
dev_add_pack(&fcoe->fcoe_packet_type);
fcoe->fip_packet_type.func = fcoe_fip_recv;
fcoe->fip_packet_type.type = htons(ETH_P_FIP);
fcoe->fip_packet_type.dev = netdev;
dev_add_pack(&fcoe->fip_packet_type);
return 0;
}
static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb);
static void fcoe_update_src_mac(struct fcoe_ctlr *fip, u8 *old, u8 *new);
static void fcoe_destroy_work(struct work_struct *work);
/**
* fcoe_interface_create()
* @netdev: network interface
*
* Returns: pointer to a struct fcoe_interface or NULL on error
*/
static struct fcoe_interface *fcoe_interface_create(struct net_device *netdev)
{
struct fcoe_interface *fcoe;
fcoe = kzalloc(sizeof(*fcoe), GFP_KERNEL);
if (!fcoe) {
FCOE_NETDEV_DBG(netdev, "Could not allocate fcoe structure\n");
return NULL;
}
dev_hold(netdev);
kref_init(&fcoe->kref);
/*
* Initialize FIP.
*/
fcoe_ctlr_init(&fcoe->ctlr);
fcoe->ctlr.send = fcoe_fip_send;
fcoe->ctlr.update_mac = fcoe_update_src_mac;
fcoe_interface_setup(fcoe, netdev);
return fcoe;
}
/**
* fcoe_interface_cleanup() - clean up netdev configurations
* @fcoe:
*
* Caller must be holding the RTNL mutex
*/
void fcoe_interface_cleanup(struct fcoe_interface *fcoe)
{
struct net_device *netdev = fcoe->netdev;
struct fcoe_ctlr *fip = &fcoe->ctlr;
u8 flogi_maddr[ETH_ALEN];
/*
* Don't listen for Ethernet packets anymore.
* synchronize_net() ensures that the packet handlers are not running
* on another CPU. dev_remove_pack() would do that, this calls the
* unsyncronized version __dev_remove_pack() to avoid multiple delays.
*/
__dev_remove_pack(&fcoe->fcoe_packet_type);
__dev_remove_pack(&fcoe->fip_packet_type);
synchronize_net();
/* Delete secondary MAC addresses */
memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
dev_unicast_delete(netdev, flogi_maddr);
if (!is_zero_ether_addr(fip->data_src_addr))
dev_unicast_delete(netdev, fip->data_src_addr);
if (fip->spma)
dev_unicast_delete(netdev, fip->ctl_src_addr);
dev_mc_delete(netdev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0);
}
/**
* fcoe_interface_release() - fcoe_port kref release function
* @kref: embedded reference count in an fcoe_interface struct
*/
static void fcoe_interface_release(struct kref *kref)
{
struct fcoe_interface *fcoe;
struct net_device *netdev;
fcoe = container_of(kref, struct fcoe_interface, kref);
netdev = fcoe->netdev;
/* tear-down the FCoE controller */
fcoe_ctlr_destroy(&fcoe->ctlr);
kfree(fcoe);
dev_put(netdev);
}
/**
* fcoe_interface_get()
* @fcoe:
*/
static inline void fcoe_interface_get(struct fcoe_interface *fcoe)
{
kref_get(&fcoe->kref);
}
/**
* fcoe_interface_put()
* @fcoe:
*/
static inline void fcoe_interface_put(struct fcoe_interface *fcoe)
{
kref_put(&fcoe->kref, fcoe_interface_release);
}
/**
* fcoe_fip_recv - handle a received FIP frame.
* @skb: the receive skb
* @dev: associated &net_device
* @ptype: the &packet_type structure which was used to register this handler.
* @orig_dev: original receive &net_device, in case @dev is a bond.
*
* Returns: 0 for success
*/
static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *ptype,
struct net_device *orig_dev)
{
struct fcoe_interface *fcoe;
fcoe = container_of(ptype, struct fcoe_interface, fip_packet_type);
fcoe_ctlr_recv(&fcoe->ctlr, skb);
return 0;
}
/**
* fcoe_fip_send() - send an Ethernet-encapsulated FIP frame.
* @fip: FCoE controller.
* @skb: FIP Packet.
*/
static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
skb->dev = fcoe_from_ctlr(fip)->netdev;
dev_queue_xmit(skb);
}
/**
* fcoe_update_src_mac() - Update Ethernet MAC filters.
* @fip: FCoE controller.
* @old: Unicast MAC address to delete if the MAC is non-zero.
* @new: Unicast MAC address to add.
*
* Remove any previously-set unicast MAC filter.
* Add secondary FCoE MAC address filter for our OUI.
*/
static void fcoe_update_src_mac(struct fcoe_ctlr *fip, u8 *old, u8 *new)
{
struct fcoe_interface *fcoe;
fcoe = fcoe_from_ctlr(fip);
rtnl_lock();
if (!is_zero_ether_addr(old))
dev_unicast_delete(fcoe->netdev, old);
dev_unicast_add(fcoe->netdev, new);
rtnl_unlock();
}
/**
* fcoe_lport_config() - sets up the fc_lport
* @lp: ptr to the fc_lport
*
* Returns: 0 for success
*/
static int fcoe_lport_config(struct fc_lport *lp)
{
lp->link_up = 0;
lp->qfull = 0;
lp->max_retry_count = 3;
lp->max_rport_retry_count = 3;
lp->e_d_tov = 2 * 1000; /* FC-FS default */
lp->r_a_tov = 2 * 2 * 1000;
lp->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS |
FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL);
fc_lport_init_stats(lp);
/* lport fc_lport related configuration */
fc_lport_config(lp);
/* offload related configuration */
lp->crc_offload = 0;
lp->seq_offload = 0;
lp->lro_enabled = 0;
lp->lro_xid = 0;
lp->lso_max = 0;
return 0;
}
/**
* fcoe_queue_timer() - fcoe queue timer
* @lp: the fc_lport pointer
*
* Calls fcoe_check_wait_queue on timeout
*
*/
static void fcoe_queue_timer(ulong lp)
{
fcoe_check_wait_queue((struct fc_lport *)lp, NULL);
}
/**
* fcoe_netdev_config() - Set up netdev for SW FCoE
* @lp : ptr to the fc_lport
* @netdev : ptr to the associated netdevice struct
*
* Must be called after fcoe_lport_config() as it will use lport mutex
*
* Returns : 0 for success
*/
static int fcoe_netdev_config(struct fc_lport *lp, struct net_device *netdev)
{
u32 mfs;
u64 wwnn, wwpn;
struct fcoe_interface *fcoe;
struct fcoe_port *port;
/* Setup lport private data to point to fcoe softc */
port = lport_priv(lp);
fcoe = port->fcoe;
/*
* Determine max frame size based on underlying device and optional
* user-configured limit. If the MFS is too low, fcoe_link_ok()
* will return 0, so do this first.
*/
mfs = netdev->mtu - (sizeof(struct fcoe_hdr) +
sizeof(struct fcoe_crc_eof));
if (fc_set_mfs(lp, mfs))
return -EINVAL;
/* offload features support */
if (netdev->features & NETIF_F_SG)
lp->sg_supp = 1;
if (netdev->features & NETIF_F_FCOE_CRC) {
lp->crc_offload = 1;
FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n");
}
if (netdev->features & NETIF_F_FSO) {
lp->seq_offload = 1;
lp->lso_max = netdev->gso_max_size;
FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n",
lp->lso_max);
}
if (netdev->fcoe_ddp_xid) {
lp->lro_enabled = 1;
lp->lro_xid = netdev->fcoe_ddp_xid;
FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n",
lp->lro_xid);
}
skb_queue_head_init(&port->fcoe_pending_queue);
port->fcoe_pending_queue_active = 0;
setup_timer(&port->timer, fcoe_queue_timer, (unsigned long)lp);
wwnn = fcoe_wwn_from_mac(netdev->dev_addr, 1, 0);
fc_set_wwnn(lp, wwnn);
/* XXX - 3rd arg needs to be vlan id */
wwpn = fcoe_wwn_from_mac(netdev->dev_addr, 2, 0);
fc_set_wwpn(lp, wwpn);
return 0;
}
/**
* fcoe_shost_config() - Sets up fc_lport->host
* @lp : ptr to the fc_lport
* @shost : ptr to the associated scsi host
* @dev : device associated to scsi host
*
* Must be called after fcoe_lport_config() and fcoe_netdev_config()
*
* Returns : 0 for success
*/
static int fcoe_shost_config(struct fc_lport *lp, struct Scsi_Host *shost,
struct device *dev)
{
int rc = 0;
/* lport scsi host config */
lp->host = shost;
lp->host->max_lun = FCOE_MAX_LUN;
lp->host->max_id = FCOE_MAX_FCP_TARGET;
lp->host->max_channel = 0;
lp->host->transportt = scsi_transport_fcoe_sw;
/* add the new host to the SCSI-ml */
rc = scsi_add_host(lp->host, dev);
if (rc) {
FCOE_NETDEV_DBG(fcoe_netdev(lp), "fcoe_shost_config: "
"error on scsi_add_host\n");
return rc;
}
sprintf(fc_host_symbolic_name(lp->host), "%s v%s over %s",
FCOE_NAME, FCOE_VERSION,
fcoe_netdev(lp)->name);
return 0;
}
/*
* fcoe_oem_match() - match for read types IO
* @fp: the fc_frame for new IO.
*
* Returns : true for read types IO, otherwise returns false.
*/
bool fcoe_oem_match(struct fc_frame *fp)
{
return fc_fcp_is_read(fr_fsp(fp)) &&
(fr_fsp(fp)->data_len > fcoe_ddp_min);
}
/**
* fcoe_em_config() - allocates em for this lport
* @lp: the fcoe that em is to allocated for
*
* Returns : 0 on success
*/
static inline int fcoe_em_config(struct fc_lport *lp)
{
struct fcoe_port *port = lport_priv(lp);
struct fcoe_interface *fcoe = port->fcoe;
struct fcoe_interface *oldfcoe = NULL;
struct net_device *old_real_dev, *cur_real_dev;
u16 min_xid = FCOE_MIN_XID;
u16 max_xid = FCOE_MAX_XID;
/*
* Check if need to allocate an em instance for
* offload exchange ids to be shared across all VN_PORTs/lport.
*/
if (!lp->lro_enabled || !lp->lro_xid || (lp->lro_xid >= max_xid)) {
lp->lro_xid = 0;
goto skip_oem;
}
/*
* Reuse existing offload em instance in case
* it is already allocated on real eth device
*/
if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
cur_real_dev = vlan_dev_real_dev(fcoe->netdev);
else
cur_real_dev = fcoe->netdev;
list_for_each_entry(oldfcoe, &fcoe_hostlist, list) {
if (oldfcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
old_real_dev = vlan_dev_real_dev(oldfcoe->netdev);
else
old_real_dev = oldfcoe->netdev;
if (cur_real_dev == old_real_dev) {
fcoe->oem = oldfcoe->oem;
break;
}
}
if (fcoe->oem) {
if (!fc_exch_mgr_add(lp, fcoe->oem, fcoe_oem_match)) {
printk(KERN_ERR "fcoe_em_config: failed to add "
"offload em:%p on interface:%s\n",
fcoe->oem, fcoe->netdev->name);
return -ENOMEM;
}
} else {
fcoe->oem = fc_exch_mgr_alloc(lp, FC_CLASS_3,
FCOE_MIN_XID, lp->lro_xid,
fcoe_oem_match);
if (!fcoe->oem) {
printk(KERN_ERR "fcoe_em_config: failed to allocate "
"em for offload exches on interface:%s\n",
fcoe->netdev->name);
return -ENOMEM;
}
}
/*
* Exclude offload EM xid range from next EM xid range.
*/
min_xid += lp->lro_xid + 1;
skip_oem:
if (!fc_exch_mgr_alloc(lp, FC_CLASS_3, min_xid, max_xid, NULL)) {
printk(KERN_ERR "fcoe_em_config: failed to "
"allocate em on interface %s\n", fcoe->netdev->name);
return -ENOMEM;
}
return 0;
}
/**
* fcoe_if_destroy() - FCoE software HBA tear-down function
* @lport: fc_lport to destroy
*/
static void fcoe_if_destroy(struct fc_lport *lport)
{
struct fcoe_port *port = lport_priv(lport);
struct fcoe_interface *fcoe = port->fcoe;
struct net_device *netdev = fcoe->netdev;
FCOE_NETDEV_DBG(netdev, "Destroying interface\n");
/* Logout of the fabric */
fc_fabric_logoff(lport);
/* Cleanup the fc_lport */
fc_lport_destroy(lport);
fc_fcp_destroy(lport);
/* Stop the transmit retry timer */
del_timer_sync(&port->timer);
/* Free existing transmit skbs */
fcoe_clean_pending_queue(lport);
/* receives may not be stopped until after this */
fcoe_interface_put(fcoe);
/* Free queued packets for the per-CPU receive threads */
fcoe_percpu_clean(lport);
/* Detach from the scsi-ml */
fc_remove_host(lport->host);
scsi_remove_host(lport->host);
/* There are no more rports or I/O, free the EM */
fc_exch_mgr_free(lport);
/* Free memory used by statistical counters */
fc_lport_free_stats(lport);
/* Release the Scsi_Host */
scsi_host_put(lport->host);
}
/*
* fcoe_ddp_setup - calls LLD's ddp_setup through net_device
* @lp: the corresponding fc_lport
* @xid: the exchange id for this ddp transfer
* @sgl: the scatterlist describing this transfer
* @sgc: number of sg items
*
* Returns : 0 no ddp
*/
static int fcoe_ddp_setup(struct fc_lport *lp, u16 xid,
struct scatterlist *sgl, unsigned int sgc)
{
struct net_device *n = fcoe_netdev(lp);
if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_setup)
return n->netdev_ops->ndo_fcoe_ddp_setup(n, xid, sgl, sgc);
return 0;
}
/*
* fcoe_ddp_done - calls LLD's ddp_done through net_device
* @lp: the corresponding fc_lport
* @xid: the exchange id for this ddp transfer
*
* Returns : the length of data that have been completed by ddp
*/
static int fcoe_ddp_done(struct fc_lport *lp, u16 xid)
{
struct net_device *n = fcoe_netdev(lp);
if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_done)
return n->netdev_ops->ndo_fcoe_ddp_done(n, xid);
return 0;
}
static struct libfc_function_template fcoe_libfc_fcn_templ = {
.frame_send = fcoe_xmit,
.ddp_setup = fcoe_ddp_setup,
.ddp_done = fcoe_ddp_done,
};
/**
* fcoe_if_create() - this function creates the fcoe port
* @fcoe: fcoe_interface structure to create an fc_lport instance on
* @parent: device pointer to be the parent in sysfs for the SCSI host
*
* Creates fc_lport struct and scsi_host for lport, configures lport.
*
* Returns : The allocated fc_lport or an error pointer
*/
static struct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe,
struct device *parent)
{
int rc;
struct fc_lport *lport = NULL;
struct fcoe_port *port;
struct Scsi_Host *shost;
struct net_device *netdev = fcoe->netdev;
FCOE_NETDEV_DBG(netdev, "Create Interface\n");
shost = libfc_host_alloc(&fcoe_shost_template,
sizeof(struct fcoe_port));
if (!shost) {
FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n");
rc = -ENOMEM;
goto out;
}
lport = shost_priv(shost);
port = lport_priv(lport);
port->lport = lport;
port->fcoe = fcoe;
INIT_WORK(&port->destroy_work, fcoe_destroy_work);
/* configure fc_lport, e.g., em */
rc = fcoe_lport_config(lport);
if (rc) {
FCOE_NETDEV_DBG(netdev, "Could not configure lport for the "
"interface\n");
goto out_host_put;
}
/* configure lport network properties */
rc = fcoe_netdev_config(lport, netdev);
if (rc) {
FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the "
"interface\n");
goto out_lp_destroy;
}
/* configure lport scsi host properties */
rc = fcoe_shost_config(lport, shost, parent);
if (rc) {
FCOE_NETDEV_DBG(netdev, "Could not configure shost for the "
"interface\n");
goto out_lp_destroy;
}
/* Initialize the library */
rc = fcoe_libfc_config(lport, &fcoe_libfc_fcn_templ);
if (rc) {
FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the "
"interface\n");
goto out_lp_destroy;
}
/*
* fcoe_em_alloc() and fcoe_hostlist_add() both
* need to be atomic with respect to other changes to the hostlist
* since fcoe_em_alloc() looks for an existing EM
* instance on host list updated by fcoe_hostlist_add().
*
* This is currently handled through the fcoe_config_mutex begin held.
*/
/* lport exch manager allocation */
rc = fcoe_em_config(lport);
if (rc) {
FCOE_NETDEV_DBG(netdev, "Could not configure the EM for the "
"interface\n");
goto out_lp_destroy;
}
fcoe_interface_get(fcoe);
return lport;
out_lp_destroy:
fc_exch_mgr_free(lport);
out_host_put:
scsi_host_put(lport->host);
out:
return ERR_PTR(rc);
}
/**
* fcoe_if_init() - attach to scsi transport
*
* Returns : 0 on success
*/
static int __init fcoe_if_init(void)
{
/* attach to scsi transport */
scsi_transport_fcoe_sw =
fc_attach_transport(&fcoe_transport_function);
if (!scsi_transport_fcoe_sw) {
printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n");
return -ENODEV;
}
return 0;
}
/**
* fcoe_if_exit() - detach from scsi transport
*
* Returns : 0 on success
*/
int __exit fcoe_if_exit(void)
{
fc_release_transport(scsi_transport_fcoe_sw);
scsi_transport_fcoe_sw = NULL;
return 0;
}
/**
* fcoe_percpu_thread_create() - Create a receive thread for an online cpu
* @cpu: cpu index for the online cpu
*/
static void fcoe_percpu_thread_create(unsigned int cpu)
{
struct fcoe_percpu_s *p;
struct task_struct *thread;
p = &per_cpu(fcoe_percpu, cpu);
thread = kthread_create(fcoe_percpu_receive_thread,
(void *)p, "fcoethread/%d", cpu);
if (likely(!IS_ERR(thread))) {
kthread_bind(thread, cpu);
wake_up_process(thread);
spin_lock_bh(&p->fcoe_rx_list.lock);
p->thread = thread;
spin_unlock_bh(&p->fcoe_rx_list.lock);
}
}
/**
* fcoe_percpu_thread_destroy() - removes the rx thread for the given cpu
* @cpu: cpu index the rx thread is to be removed
*
* Destroys a per-CPU Rx thread. Any pending skbs are moved to the
* current CPU's Rx thread. If the thread being destroyed is bound to
* the CPU processing this context the skbs will be freed.
*/
static void fcoe_percpu_thread_destroy(unsigned int cpu)
{
struct fcoe_percpu_s *p;
struct task_struct *thread;
struct page *crc_eof;
struct sk_buff *skb;
#ifdef CONFIG_SMP
struct fcoe_percpu_s *p0;
unsigned targ_cpu = smp_processor_id();
#endif /* CONFIG_SMP */
FCOE_DBG("Destroying receive thread for CPU %d\n", cpu);
/* Prevent any new skbs from being queued for this CPU. */
p = &per_cpu(fcoe_percpu, cpu);
spin_lock_bh(&p->fcoe_rx_list.lock);
thread = p->thread;
p->thread = NULL;
crc_eof = p->crc_eof_page;
p->crc_eof_page = NULL;
p->crc_eof_offset = 0;
spin_unlock_bh(&p->fcoe_rx_list.lock);
#ifdef CONFIG_SMP
/*
* Don't bother moving the skb's if this context is running
* on the same CPU that is having its thread destroyed. This
* can easily happen when the module is removed.
*/
if (cpu != targ_cpu) {
p0 = &per_cpu(fcoe_percpu, targ_cpu);
spin_lock_bh(&p0->fcoe_rx_list.lock);
if (p0->thread) {
FCOE_DBG("Moving frames from CPU %d to CPU %d\n",
cpu, targ_cpu);
while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
__skb_queue_tail(&p0->fcoe_rx_list, skb);
spin_unlock_bh(&p0->fcoe_rx_list.lock);
} else {
/*
* The targeted CPU is not initialized and cannot accept
* new skbs. Unlock the targeted CPU and drop the skbs
* on the CPU that is going offline.
*/
while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
kfree_skb(skb);
spin_unlock_bh(&p0->fcoe_rx_list.lock);
}
} else {
/*
* This scenario occurs when the module is being removed
* and all threads are being destroyed. skbs will continue
* to be shifted from the CPU thread that is being removed
* to the CPU thread associated with the CPU that is processing
* the module removal. Once there is only one CPU Rx thread it
* will reach this case and we will drop all skbs and later
* stop the thread.
*/
spin_lock_bh(&p->fcoe_rx_list.lock);
while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
kfree_skb(skb);
spin_unlock_bh(&p->fcoe_rx_list.lock);
}
#else
/*
* This a non-SMP scenario where the singular Rx thread is
* being removed. Free all skbs and stop the thread.
*/
spin_lock_bh(&p->fcoe_rx_list.lock);
while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
kfree_skb(skb);
spin_unlock_bh(&p->fcoe_rx_list.lock);
#endif
if (thread)
kthread_stop(thread);
if (crc_eof)
put_page(crc_eof);
}
/**
* fcoe_cpu_callback() - fcoe cpu hotplug event callback
* @nfb: callback data block
* @action: event triggering the callback
* @hcpu: index for the cpu of this event
*
* This creates or destroys per cpu data for fcoe
*
* Returns NOTIFY_OK always.
*/
static int fcoe_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
unsigned cpu = (unsigned long)hcpu;
switch (action) {
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
FCOE_DBG("CPU %x online: Create Rx thread\n", cpu);
fcoe_percpu_thread_create(cpu);
break;
case CPU_DEAD:
case CPU_DEAD_FROZEN:
FCOE_DBG("CPU %x offline: Remove Rx thread\n", cpu);
fcoe_percpu_thread_destroy(cpu);
break;
default:
break;
}
return NOTIFY_OK;
}
static struct notifier_block fcoe_cpu_notifier = {
.notifier_call = fcoe_cpu_callback,
};
/**
* fcoe_rcv() - this is the fcoe receive function called by NET_RX_SOFTIRQ
* @skb: the receive skb
* @dev: associated net device
* @ptype: context
* @olddev: last device
*
* this function will receive the packet and build fc frame and pass it up
*
* Returns: 0 for success
*/
int fcoe_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *ptype, struct net_device *olddev)
{
struct fc_lport *lp;
struct fcoe_rcv_info *fr;
struct fcoe_interface *fcoe;
struct fc_frame_header *fh;
struct fcoe_percpu_s *fps;
unsigned int cpu;
fcoe = container_of(ptype, struct fcoe_interface, fcoe_packet_type);
lp = fcoe->ctlr.lp;
if (unlikely(lp == NULL)) {
FCOE_NETDEV_DBG(dev, "Cannot find hba structure");
goto err2;
}
if (!lp->link_up)
goto err2;
FCOE_NETDEV_DBG(dev, "skb_info: len:%d data_len:%d head:%p "
"data:%p tail:%p end:%p sum:%d dev:%s",
skb->len, skb->data_len, skb->head, skb->data,
skb_tail_pointer(skb), skb_end_pointer(skb),
skb->csum, skb->dev ? skb->dev->name : "<NULL>");
/* check for FCOE packet type */
if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) {
FCOE_NETDEV_DBG(dev, "Wrong FC type frame");
goto err;
}
/*
* Check for minimum frame length, and make sure required FCoE
* and FC headers are pulled into the linear data area.
*/
if (unlikely((skb->len < FCOE_MIN_FRAME) ||
!pskb_may_pull(skb, FCOE_HEADER_LEN)))
goto err;
skb_set_transport_header(skb, sizeof(struct fcoe_hdr));
fh = (struct fc_frame_header *) skb_transport_header(skb);
fr = fcoe_dev_from_skb(skb);
fr->fr_dev = lp;
fr->ptype = ptype;
/*
* In case the incoming frame's exchange is originated from
* the initiator, then received frame's exchange id is ANDed
* with fc_cpu_mask bits to get the same cpu on which exchange
* was originated, otherwise just use the current cpu.
*/
if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX)
cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask;
else
cpu = smp_processor_id();
fps = &per_cpu(fcoe_percpu, cpu);
spin_lock_bh(&fps->fcoe_rx_list.lock);
if (unlikely(!fps->thread)) {
/*
* The targeted CPU is not ready, let's target
* the first CPU now. For non-SMP systems this
* will check the same CPU twice.
*/
FCOE_NETDEV_DBG(dev, "CPU is online, but no receive thread "
"ready for incoming skb- using first online "
"CPU.\n");
spin_unlock_bh(&fps->fcoe_rx_list.lock);
cpu = first_cpu(cpu_online_map);
fps = &per_cpu(fcoe_percpu, cpu);
spin_lock_bh(&fps->fcoe_rx_list.lock);
if (!fps->thread) {
spin_unlock_bh(&fps->fcoe_rx_list.lock);
goto err;
}
}
/*
* We now have a valid CPU that we're targeting for
* this skb. We also have this receive thread locked,
* so we're free to queue skbs into it's queue.
*/
__skb_queue_tail(&fps->fcoe_rx_list, skb);
if (fps->fcoe_rx_list.qlen == 1)
wake_up_process(fps->thread);
spin_unlock_bh(&fps->fcoe_rx_list.lock);
return 0;
err:
fc_lport_get_stats(lp)->ErrorFrames++;
err2:
kfree_skb(skb);
return -1;
}
/**
* fcoe_start_io() - pass to netdev to start xmit for fcoe
* @skb: the skb to be xmitted
*
* Returns: 0 for success
*/
static inline int fcoe_start_io(struct sk_buff *skb)
{
int rc;
skb_get(skb);
rc = dev_queue_xmit(skb);
if (rc != 0)
return rc;
kfree_skb(skb);
return 0;
}
/**
* fcoe_get_paged_crc_eof() - in case we need to alloc a page for crc_eof
* @skb: the skb to be xmitted
* @tlen: total len
*
* Returns: 0 for success
*/
static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen)
{
struct fcoe_percpu_s *fps;
struct page *page;
fps = &get_cpu_var(fcoe_percpu);
page = fps->crc_eof_page;
if (!page) {
page = alloc_page(GFP_ATOMIC);
if (!page) {
put_cpu_var(fcoe_percpu);
return -ENOMEM;
}
fps->crc_eof_page = page;
fps->crc_eof_offset = 0;
}
get_page(page);
skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page,
fps->crc_eof_offset, tlen);
skb->len += tlen;
skb->data_len += tlen;
skb->truesize += tlen;
fps->crc_eof_offset += sizeof(struct fcoe_crc_eof);
if (fps->crc_eof_offset >= PAGE_SIZE) {
fps->crc_eof_page = NULL;
fps->crc_eof_offset = 0;
put_page(page);
}
put_cpu_var(fcoe_percpu);
return 0;
}
/**
* fcoe_fc_crc() - calculates FC CRC in this fcoe skb
* @fp: the fc_frame containing data to be checksummed
*
* This uses crc32() to calculate the crc for port frame
* Return : 32 bit crc
*/
u32 fcoe_fc_crc(struct fc_frame *fp)
{
struct sk_buff *skb = fp_skb(fp);
struct skb_frag_struct *frag;
unsigned char *data;
unsigned long off, len, clen;
u32 crc;
unsigned i;
crc = crc32(~0, skb->data, skb_headlen(skb));
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
frag = &skb_shinfo(skb)->frags[i];
off = frag->page_offset;
len = frag->size;
while (len > 0) {
clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK));
data = kmap_atomic(frag->page + (off >> PAGE_SHIFT),
KM_SKB_DATA_SOFTIRQ);
crc = crc32(crc, data + (off & ~PAGE_MASK), clen);
kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ);
off += clen;
len -= clen;
}
}
return crc;
}
/**
* fcoe_xmit() - FCoE frame transmit function
* @lp: the associated local fcoe
* @fp: the fc_frame to be transmitted
*
* Return : 0 for success
*/
int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp)
{
int wlen;
u32 crc;
struct ethhdr *eh;
struct fcoe_crc_eof *cp;
struct sk_buff *skb;
struct fcoe_dev_stats *stats;
struct fc_frame_header *fh;
unsigned int hlen; /* header length implies the version */
unsigned int tlen; /* trailer length */
unsigned int elen; /* eth header, may include vlan */
struct fcoe_port *port = lport_priv(lp);
struct fcoe_interface *fcoe = port->fcoe;
u8 sof, eof;
struct fcoe_hdr *hp;
WARN_ON((fr_len(fp) % sizeof(u32)) != 0);
fh = fc_frame_header_get(fp);
skb = fp_skb(fp);
wlen = skb->len / FCOE_WORD_TO_BYTE;
if (!lp->link_up) {
kfree_skb(skb);
return 0;
}
if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ) &&
fcoe_ctlr_els_send(&fcoe->ctlr, skb))
return 0;
sof = fr_sof(fp);
eof = fr_eof(fp);
elen = sizeof(struct ethhdr);
hlen = sizeof(struct fcoe_hdr);
tlen = sizeof(struct fcoe_crc_eof);
wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE;
/* crc offload */
if (likely(lp->crc_offload)) {
skb->ip_summed = CHECKSUM_PARTIAL;
skb->csum_start = skb_headroom(skb);
skb->csum_offset = skb->len;
crc = 0;
} else {
skb->ip_summed = CHECKSUM_NONE;
crc = fcoe_fc_crc(fp);
}
/* copy port crc and eof to the skb buff */
if (skb_is_nonlinear(skb)) {
skb_frag_t *frag;
if (fcoe_get_paged_crc_eof(skb, tlen)) {
kfree_skb(skb);
return -ENOMEM;
}
frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ)
+ frag->page_offset;
} else {
cp = (struct fcoe_crc_eof *)skb_put(skb, tlen);
}
memset(cp, 0, sizeof(*cp));
cp->fcoe_eof = eof;
cp->fcoe_crc32 = cpu_to_le32(~crc);
if (skb_is_nonlinear(skb)) {
kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ);
cp = NULL;
}
/* adjust skb network/transport offsets to match mac/fcoe/port */
skb_push(skb, elen + hlen);
skb_reset_mac_header(skb);
skb_reset_network_header(skb);
skb->mac_len = elen;
skb->protocol = htons(ETH_P_FCOE);
skb->dev = fcoe->netdev;
/* fill up mac and fcoe headers */
eh = eth_hdr(skb);
eh->h_proto = htons(ETH_P_FCOE);
if (fcoe->ctlr.map_dest)
fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id);
else
/* insert GW address */
memcpy(eh->h_dest, fcoe->ctlr.dest_addr, ETH_ALEN);
if (unlikely(fcoe->ctlr.flogi_oxid != FC_XID_UNKNOWN))
memcpy(eh->h_source, fcoe->ctlr.ctl_src_addr, ETH_ALEN);
else
memcpy(eh->h_source, fcoe->ctlr.data_src_addr, ETH_ALEN);
hp = (struct fcoe_hdr *)(eh + 1);
memset(hp, 0, sizeof(*hp));
if (FC_FCOE_VER)
FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER);
hp->fcoe_sof = sof;
/* fcoe lso, mss is in max_payload which is non-zero for FCP data */
if (lp->seq_offload && fr_max_payload(fp)) {
skb_shinfo(skb)->gso_type = SKB_GSO_FCOE;
skb_shinfo(skb)->gso_size = fr_max_payload(fp);
} else {
skb_shinfo(skb)->gso_type = 0;
skb_shinfo(skb)->gso_size = 0;
}
/* update tx stats: regardless if LLD fails */
stats = fc_lport_get_stats(lp);
stats->TxFrames++;
stats->TxWords += wlen;
/* send down to lld */
fr_dev(fp) = lp;
if (port->fcoe_pending_queue.qlen)
fcoe_check_wait_queue(lp, skb);
else if (fcoe_start_io(skb))
fcoe_check_wait_queue(lp, skb);
return 0;
}
/**
* fcoe_percpu_flush_done() - Indicate percpu queue flush completion.
* @skb: the skb being completed.
*/
static void fcoe_percpu_flush_done(struct sk_buff *skb)
{
complete(&fcoe_flush_completion);
}
/**
* fcoe_percpu_receive_thread() - recv thread per cpu
* @arg: ptr to the fcoe per cpu struct
*
* Return: 0 for success
*/
int fcoe_percpu_receive_thread(void *arg)
{
struct fcoe_percpu_s *p = arg;
u32 fr_len;
struct fc_lport *lp;
struct fcoe_rcv_info *fr;
struct fcoe_dev_stats *stats;
struct fc_frame_header *fh;
struct sk_buff *skb;
struct fcoe_crc_eof crc_eof;
struct fc_frame *fp;
u8 *mac = NULL;
struct fcoe_port *port;
struct fcoe_hdr *hp;
set_user_nice(current, -20);
while (!kthread_should_stop()) {
spin_lock_bh(&p->fcoe_rx_list.lock);
while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) {
set_current_state(TASK_INTERRUPTIBLE);
spin_unlock_bh(&p->fcoe_rx_list.lock);
schedule();
set_current_state(TASK_RUNNING);
if (kthread_should_stop())
return 0;
spin_lock_bh(&p->fcoe_rx_list.lock);
}
spin_unlock_bh(&p->fcoe_rx_list.lock);
fr = fcoe_dev_from_skb(skb);
lp = fr->fr_dev;
if (unlikely(lp == NULL)) {
if (skb->destructor != fcoe_percpu_flush_done)
FCOE_NETDEV_DBG(skb->dev, "NULL lport in skb");
kfree_skb(skb);
continue;
}
FCOE_NETDEV_DBG(skb->dev, "skb_info: len:%d data_len:%d "
"head:%p data:%p tail:%p end:%p sum:%d dev:%s",
skb->len, skb->data_len,
skb->head, skb->data, skb_tail_pointer(skb),
skb_end_pointer(skb), skb->csum,
skb->dev ? skb->dev->name : "<NULL>");
/*
* Save source MAC address before discarding header.
*/
port = lport_priv(lp);
if (skb_is_nonlinear(skb))
skb_linearize(skb); /* not ideal */
mac = eth_hdr(skb)->h_source;
/*
* Frame length checks and setting up the header pointers
* was done in fcoe_rcv already.
*/
hp = (struct fcoe_hdr *) skb_network_header(skb);
fh = (struct fc_frame_header *) skb_transport_header(skb);
stats = fc_lport_get_stats(lp);
if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
if (stats->ErrorFrames < 5)
printk(KERN_WARNING "fcoe: FCoE version "
"mismatch: The frame has "
"version %x, but the "
"initiator supports version "
"%x\n", FC_FCOE_DECAPS_VER(hp),
FC_FCOE_VER);
stats->ErrorFrames++;
kfree_skb(skb);
continue;
}
skb_pull(skb, sizeof(struct fcoe_hdr));
fr_len = skb->len - sizeof(struct fcoe_crc_eof);
stats->RxFrames++;
stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;
fp = (struct fc_frame *)skb;
fc_frame_init(fp);
fr_dev(fp) = lp;
fr_sof(fp) = hp->fcoe_sof;
/* Copy out the CRC and EOF trailer for access */
if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) {
kfree_skb(skb);
continue;
}
fr_eof(fp) = crc_eof.fcoe_eof;
fr_crc(fp) = crc_eof.fcoe_crc32;
if (pskb_trim(skb, fr_len)) {
kfree_skb(skb);
continue;
}
/*
* We only check CRC if no offload is available and if it is
* it's solicited data, in which case, the FCP layer would
* check it during the copy.
*/
if (lp->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY)
fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
else
fr_flags(fp) |= FCPHF_CRC_UNCHECKED;
fh = fc_frame_header_get(fp);
if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA &&
fh->fh_type == FC_TYPE_FCP) {
fc_exch_recv(lp, fp);
continue;
}
if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) {
if (le32_to_cpu(fr_crc(fp)) !=
~crc32(~0, skb->data, fr_len)) {
if (stats->InvalidCRCCount < 5)
printk(KERN_WARNING "fcoe: dropping "
"frame with CRC error\n");
stats->InvalidCRCCount++;
stats->ErrorFrames++;
fc_frame_free(fp);
continue;
}
fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
}
if (unlikely(port->fcoe->ctlr.flogi_oxid != FC_XID_UNKNOWN) &&
fcoe_ctlr_recv_flogi(&port->fcoe->ctlr, fp, mac)) {
fc_frame_free(fp);
continue;
}
fc_exch_recv(lp, fp);
}
return 0;
}
/**
* fcoe_check_wait_queue() - attempt to clear the transmit backlog
* @lp: the fc_lport
*
* This empties the wait_queue, dequeue the head of the wait_queue queue
* and calls fcoe_start_io() for each packet, if all skb have been
* transmitted, return qlen or -1 if a error occurs, then restore
* wait_queue and try again later.
*
* The wait_queue is used when the skb transmit fails. skb will go
* in the wait_queue which will be emptied by the timer function or
* by the next skb transmit.
*/
static void fcoe_check_wait_queue(struct fc_lport *lp, struct sk_buff *skb)
{
struct fcoe_port *port = lport_priv(lp);
int rc;
spin_lock_bh(&port->fcoe_pending_queue.lock);
if (skb)
__skb_queue_tail(&port->fcoe_pending_queue, skb);
if (port->fcoe_pending_queue_active)
goto out;
port->fcoe_pending_queue_active = 1;
while (port->fcoe_pending_queue.qlen) {
/* keep qlen > 0 until fcoe_start_io succeeds */
port->fcoe_pending_queue.qlen++;
skb = __skb_dequeue(&port->fcoe_pending_queue);
spin_unlock_bh(&port->fcoe_pending_queue.lock);
rc = fcoe_start_io(skb);
spin_lock_bh(&port->fcoe_pending_queue.lock);
if (rc) {
__skb_queue_head(&port->fcoe_pending_queue, skb);
/* undo temporary increment above */
port->fcoe_pending_queue.qlen--;
break;
}
/* undo temporary increment above */
port->fcoe_pending_queue.qlen--;
}
if (port->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH)
lp->qfull = 0;
if (port->fcoe_pending_queue.qlen && !timer_pending(&port->timer))
mod_timer(&port->timer, jiffies + 2);
port->fcoe_pending_queue_active = 0;
out:
if (port->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
lp->qfull = 1;
spin_unlock_bh(&port->fcoe_pending_queue.lock);
return;
}
/**
* fcoe_dev_setup() - setup link change notification interface
*/
static void fcoe_dev_setup(void)
{
register_netdevice_notifier(&fcoe_notifier);
}
/**
* fcoe_dev_cleanup() - cleanup link change notification interface
*/
static void fcoe_dev_cleanup(void)
{
unregister_netdevice_notifier(&fcoe_notifier);
}
/**
* fcoe_device_notification() - netdev event notification callback
* @notifier: context of the notification
* @event: type of event
* @ptr: fixed array for output parsed ifname
*
* This function is called by the ethernet driver in case of link change event
*
* Returns: 0 for success
*/
static int fcoe_device_notification(struct notifier_block *notifier,
ulong event, void *ptr)
{
struct fc_lport *lp = NULL;
struct net_device *netdev = ptr;
struct fcoe_interface *fcoe;
struct fcoe_port *port;
struct fcoe_dev_stats *stats;
u32 link_possible = 1;
u32 mfs;
int rc = NOTIFY_OK;
list_for_each_entry(fcoe, &fcoe_hostlist, list) {
if (fcoe->netdev == netdev) {
lp = fcoe->ctlr.lp;
break;
}
}
if (lp == NULL) {
rc = NOTIFY_DONE;
goto out;
}
switch (event) {
case NETDEV_DOWN:
case NETDEV_GOING_DOWN:
link_possible = 0;
break;
case NETDEV_UP:
case NETDEV_CHANGE:
break;
case NETDEV_CHANGEMTU:
mfs = netdev->mtu - (sizeof(struct fcoe_hdr) +
sizeof(struct fcoe_crc_eof));
if (mfs >= FC_MIN_MAX_FRAME)
fc_set_mfs(lp, mfs);
break;
case NETDEV_REGISTER:
break;
case NETDEV_UNREGISTER:
list_del(&fcoe->list);
port = lport_priv(fcoe->ctlr.lp);
fcoe_interface_cleanup(fcoe);
schedule_work(&port->destroy_work);
goto out;
break;
default:
FCOE_NETDEV_DBG(netdev, "Unknown event %ld "
"from netdev netlink\n", event);
}
if (link_possible && !fcoe_link_ok(lp))
fcoe_ctlr_link_up(&fcoe->ctlr);
else if (fcoe_ctlr_link_down(&fcoe->ctlr)) {
stats = fc_lport_get_stats(lp);
stats->LinkFailureCount++;
fcoe_clean_pending_queue(lp);
}
out:
return rc;
}
/**
* fcoe_if_to_netdev() - parse a name buffer to get netdev
* @buffer: incoming buffer to be copied
*
* Returns: NULL or ptr to net_device
*/
static struct net_device *fcoe_if_to_netdev(const char *buffer)
{
char *cp;
char ifname[IFNAMSIZ + 2];
if (buffer) {
strlcpy(ifname, buffer, IFNAMSIZ);
cp = ifname + strlen(ifname);
while (--cp >= ifname && *cp == '\n')
*cp = '\0';
return dev_get_by_name(&init_net, ifname);
}
return NULL;
}
/**
* fcoe_destroy() - handles the destroy from sysfs
* @buffer: expected to be an eth if name
* @kp: associated kernel param
*
* Returns: 0 for success
*/
static int fcoe_destroy(const char *buffer, struct kernel_param *kp)
{
struct fcoe_interface *fcoe;
struct net_device *netdev;
int rc;
mutex_lock(&fcoe_config_mutex);
#ifdef CONFIG_FCOE_MODULE
/*
* Make sure the module has been initialized, and is not about to be
* removed. Module paramter sysfs files are writable before the
* module_init function is called and after module_exit.
*/
if (THIS_MODULE->state != MODULE_STATE_LIVE) {
rc = -ENODEV;
goto out_nodev;
}
#endif
netdev = fcoe_if_to_netdev(buffer);
if (!netdev) {
rc = -ENODEV;
goto out_nodev;
}
rtnl_lock();
fcoe = fcoe_hostlist_lookup_port(netdev);
if (!fcoe) {
rtnl_unlock();
rc = -ENODEV;
goto out_putdev;
}
list_del(&fcoe->list);
fcoe_interface_cleanup(fcoe);
rtnl_unlock();
fcoe_if_destroy(fcoe->ctlr.lp);
out_putdev:
dev_put(netdev);
out_nodev:
mutex_unlock(&fcoe_config_mutex);
return rc;
}
static void fcoe_destroy_work(struct work_struct *work)
{
struct fcoe_port *port;
port = container_of(work, struct fcoe_port, destroy_work);
mutex_lock(&fcoe_config_mutex);
fcoe_if_destroy(port->lport);
mutex_unlock(&fcoe_config_mutex);
}
/**
* fcoe_create() - Handles the create call from sysfs
* @buffer: expected to be an eth if name
* @kp: associated kernel param
*
* Returns: 0 for success
*/
static int fcoe_create(const char *buffer, struct kernel_param *kp)
{
int rc;
struct fcoe_interface *fcoe;
struct fc_lport *lport;
struct net_device *netdev;
mutex_lock(&fcoe_config_mutex);
#ifdef CONFIG_FCOE_MODULE
/*
* Make sure the module has been initialized, and is not about to be
* removed. Module paramter sysfs files are writable before the
* module_init function is called and after module_exit.
*/
if (THIS_MODULE->state != MODULE_STATE_LIVE) {
rc = -ENODEV;
goto out_nodev;
}
#endif
rtnl_lock();
netdev = fcoe_if_to_netdev(buffer);
if (!netdev) {
rc = -ENODEV;
goto out_nodev;
}
/* look for existing lport */
if (fcoe_hostlist_lookup(netdev)) {
rc = -EEXIST;
goto out_putdev;
}
fcoe = fcoe_interface_create(netdev);
if (!fcoe) {
rc = -ENOMEM;
goto out_putdev;
}
lport = fcoe_if_create(fcoe, &netdev->dev);
if (IS_ERR(lport)) {
printk(KERN_ERR "fcoe: Failed to create interface (%s)\n",
netdev->name);
rc = -EIO;
fcoe_interface_cleanup(fcoe);
goto out_free;
}
/* Make this the "master" N_Port */
fcoe->ctlr.lp = lport;
/* add to lports list */
fcoe_hostlist_add(lport);
/* start FIP Discovery and FLOGI */
lport->boot_time = jiffies;
fc_fabric_login(lport);
if (!fcoe_link_ok(lport))
fcoe_ctlr_link_up(&fcoe->ctlr);
rc = 0;
out_free:
/*
* Release from init in fcoe_interface_create(), on success lport
* should be holding a reference taken in fcoe_if_create().
*/
fcoe_interface_put(fcoe);
out_putdev:
dev_put(netdev);
out_nodev:
rtnl_unlock();
mutex_unlock(&fcoe_config_mutex);
return rc;
}
module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR);
__MODULE_PARM_TYPE(create, "string");
MODULE_PARM_DESC(create, "Create fcoe fcoe using net device passed in.");
module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR);
__MODULE_PARM_TYPE(destroy, "string");
MODULE_PARM_DESC(destroy, "Destroy fcoe fcoe");
/**
* fcoe_link_ok() - Check if link is ok for the fc_lport
* @lp: ptr to the fc_lport
*
* Any permanently-disqualifying conditions have been previously checked.
* This also updates the speed setting, which may change with link for 100/1000.
*
* This function should probably be checking for PAUSE support at some point
* in the future. Currently Per-priority-pause is not determinable using
* ethtool, so we shouldn't be restrictive until that problem is resolved.
*
* Returns: 0 if link is OK for use by FCoE.
*
*/
int fcoe_link_ok(struct fc_lport *lp)
{
struct fcoe_port *port = lport_priv(lp);
struct net_device *dev = port->fcoe->netdev;
struct ethtool_cmd ecmd = { ETHTOOL_GSET };
if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) &&
(!dev_ethtool_get_settings(dev, &ecmd))) {
lp->link_supported_speeds &=
~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT);
if (ecmd.supported & (SUPPORTED_1000baseT_Half |
SUPPORTED_1000baseT_Full))
lp->link_supported_speeds |= FC_PORTSPEED_1GBIT;
if (ecmd.supported & SUPPORTED_10000baseT_Full)
lp->link_supported_speeds |=
FC_PORTSPEED_10GBIT;
if (ecmd.speed == SPEED_1000)
lp->link_speed = FC_PORTSPEED_1GBIT;
if (ecmd.speed == SPEED_10000)
lp->link_speed = FC_PORTSPEED_10GBIT;
return 0;
}
return -1;
}
/**
* fcoe_percpu_clean() - Clear the pending skbs for an lport
* @lp: the fc_lport
*
* Must be called with fcoe_create_mutex held to single-thread completion.
*
* This flushes the pending skbs by adding a new skb to each queue and
* waiting until they are all freed. This assures us that not only are
* there no packets that will be handled by the lport, but also that any
* threads already handling packet have returned.
*/
void fcoe_percpu_clean(struct fc_lport *lp)
{
struct fcoe_percpu_s *pp;
struct fcoe_rcv_info *fr;
struct sk_buff_head *list;
struct sk_buff *skb, *next;
struct sk_buff *head;
unsigned int cpu;
for_each_possible_cpu(cpu) {
pp = &per_cpu(fcoe_percpu, cpu);
spin_lock_bh(&pp->fcoe_rx_list.lock);
list = &pp->fcoe_rx_list;
head = list->next;
for (skb = head; skb != (struct sk_buff *)list;
skb = next) {
next = skb->next;
fr = fcoe_dev_from_skb(skb);
if (fr->fr_dev == lp) {
__skb_unlink(skb, list);
kfree_skb(skb);
}
}
if (!pp->thread || !cpu_online(cpu)) {
spin_unlock_bh(&pp->fcoe_rx_list.lock);
continue;
}
skb = dev_alloc_skb(0);
if (!skb) {
spin_unlock_bh(&pp->fcoe_rx_list.lock);
continue;
}
skb->destructor = fcoe_percpu_flush_done;
__skb_queue_tail(&pp->fcoe_rx_list, skb);
if (pp->fcoe_rx_list.qlen == 1)
wake_up_process(pp->thread);
spin_unlock_bh(&pp->fcoe_rx_list.lock);
wait_for_completion(&fcoe_flush_completion);
}
}
/**
* fcoe_clean_pending_queue() - Dequeue a skb and free it
* @lp: the corresponding fc_lport
*
* Returns: none
*/
void fcoe_clean_pending_queue(struct fc_lport *lp)
{
struct fcoe_port *port = lport_priv(lp);
struct sk_buff *skb;
spin_lock_bh(&port->fcoe_pending_queue.lock);
while ((skb = __skb_dequeue(&port->fcoe_pending_queue)) != NULL) {
spin_unlock_bh(&port->fcoe_pending_queue.lock);
kfree_skb(skb);
spin_lock_bh(&port->fcoe_pending_queue.lock);
}
spin_unlock_bh(&port->fcoe_pending_queue.lock);
}
/**
* fcoe_reset() - Resets the fcoe
* @shost: shost the reset is from
*
* Returns: always 0
*/
int fcoe_reset(struct Scsi_Host *shost)
{
struct fc_lport *lport = shost_priv(shost);
fc_lport_reset(lport);
return 0;
}
/**
* fcoe_hostlist_lookup_port() - find the corresponding lport by a given device
* @dev: this is currently ptr to net_device
*
* Returns: NULL or the located fcoe_port
* Locking: must be called with the RNL mutex held
*/
static struct fcoe_interface *
fcoe_hostlist_lookup_port(const struct net_device *dev)
{
struct fcoe_interface *fcoe;
list_for_each_entry(fcoe, &fcoe_hostlist, list) {
if (fcoe->netdev == dev)
return fcoe;
}
return NULL;
}
/**
* fcoe_hostlist_lookup() - Find the corresponding lport by netdev
* @netdev: ptr to net_device
*
* Returns: 0 for success
* Locking: must be called with the RTNL mutex held
*/
static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
{
struct fcoe_interface *fcoe;
fcoe = fcoe_hostlist_lookup_port(netdev);
return (fcoe) ? fcoe->ctlr.lp : NULL;
}
/**
* fcoe_hostlist_add() - Add a lport to lports list
* @lp: ptr to the fc_lport to be added
*
* Returns: 0 for success
* Locking: must be called with the RTNL mutex held
*/
static int fcoe_hostlist_add(const struct fc_lport *lport)
{
struct fcoe_interface *fcoe;
struct fcoe_port *port;
fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport));
if (!fcoe) {
port = lport_priv(lport);
fcoe = port->fcoe;
list_add_tail(&fcoe->list, &fcoe_hostlist);
}
return 0;
}
/**
* fcoe_init() - fcoe module loading initialization
*
* Returns 0 on success, negative on failure
*/
static int __init fcoe_init(void)
{
unsigned int cpu;
int rc = 0;
struct fcoe_percpu_s *p;
mutex_lock(&fcoe_config_mutex);
for_each_possible_cpu(cpu) {
p = &per_cpu(fcoe_percpu, cpu);
skb_queue_head_init(&p->fcoe_rx_list);
}
for_each_online_cpu(cpu)
fcoe_percpu_thread_create(cpu);
/* Initialize per CPU interrupt thread */
rc = register_hotcpu_notifier(&fcoe_cpu_notifier);
if (rc)
goto out_free;
/* Setup link change notification */
fcoe_dev_setup();
rc = fcoe_if_init();
if (rc)
goto out_free;
mutex_unlock(&fcoe_config_mutex);
return 0;
out_free:
for_each_online_cpu(cpu) {
fcoe_percpu_thread_destroy(cpu);
}
mutex_unlock(&fcoe_config_mutex);
return rc;
}
module_init(fcoe_init);
/**
* fcoe_exit() - fcoe module unloading cleanup
*
* Returns 0 on success, negative on failure
*/
static void __exit fcoe_exit(void)
{
unsigned int cpu;
struct fcoe_interface *fcoe, *tmp;
struct fcoe_port *port;
mutex_lock(&fcoe_config_mutex);
fcoe_dev_cleanup();
/* releases the associated fcoe hosts */
rtnl_lock();
list_for_each_entry_safe(fcoe, tmp, &fcoe_hostlist, list) {
list_del(&fcoe->list);
port = lport_priv(fcoe->ctlr.lp);
fcoe_interface_cleanup(fcoe);
schedule_work(&port->destroy_work);
}
rtnl_unlock();
unregister_hotcpu_notifier(&fcoe_cpu_notifier);
for_each_online_cpu(cpu)
fcoe_percpu_thread_destroy(cpu);
mutex_unlock(&fcoe_config_mutex);
/* flush any asyncronous interface destroys,
* this should happen after the netdev notifier is unregistered */
flush_scheduled_work();
/* detach from scsi transport
* must happen after all destroys are done, therefor after the flush */
fcoe_if_exit();
}
module_exit(fcoe_exit);