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fcoe.c
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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/slab.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 *);
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 *);
static void fcoe_clean_pending_queue(struct fc_lport *);
static void fcoe_percpu_clean(struct fc_lport *);
static int fcoe_link_speed_update(struct fc_lport *);
static int fcoe_link_ok(struct fc_lport *);
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 *);
static int fcoe_fip_recv(struct sk_buff *, struct net_device *,
struct packet_type *, struct net_device *);
static void fcoe_fip_send(struct fcoe_ctlr *, struct sk_buff *);
static void fcoe_update_src_mac(struct fc_lport *, u8 *);
static u8 *fcoe_get_src_mac(struct fc_lport *);
static void fcoe_destroy_work(struct work_struct *);
static int fcoe_ddp_setup(struct fc_lport *, u16, struct scatterlist *,
unsigned int);
static int fcoe_ddp_done(struct fc_lport *, u16);
static int fcoe_cpu_callback(struct notifier_block *, unsigned long, void *);
static int fcoe_create(const char *, struct kernel_param *);
static int fcoe_destroy(const char *, struct kernel_param *);
static int fcoe_enable(const char *, struct kernel_param *);
static int fcoe_disable(const char *, struct kernel_param *);
static struct fc_seq *fcoe_elsct_send(struct fc_lport *,
u32 did, struct fc_frame *,
unsigned int op,
void (*resp)(struct fc_seq *,
struct fc_frame *,
void *),
void *, u32 timeout);
static void fcoe_recv_frame(struct sk_buff *skb);
static void fcoe_get_lesb(struct fc_lport *, struct fc_els_lesb *);
module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR);
__MODULE_PARM_TYPE(create, "string");
MODULE_PARM_DESC(create, " Creates fcoe instance on a ethernet interface");
module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR);
__MODULE_PARM_TYPE(destroy, "string");
MODULE_PARM_DESC(destroy, " Destroys fcoe instance on a ethernet interface");
module_param_call(enable, fcoe_enable, NULL, NULL, S_IWUSR);
__MODULE_PARM_TYPE(enable, "string");
MODULE_PARM_DESC(enable, " Enables fcoe on a ethernet interface.");
module_param_call(disable, fcoe_disable, NULL, NULL, S_IWUSR);
__MODULE_PARM_TYPE(disable, "string");
MODULE_PARM_DESC(disable, " Disables fcoe on a ethernet interface.");
/* notification function for packets from net device */
static struct notifier_block fcoe_notifier = {
.notifier_call = fcoe_device_notification,
};
/* notification function for CPU hotplug events */
static struct notifier_block fcoe_cpu_notifier = {
.notifier_call = fcoe_cpu_callback,
};
static struct scsi_transport_template *fcoe_transport_template;
static struct scsi_transport_template *fcoe_vport_transport_template;
static int fcoe_vport_destroy(struct fc_vport *);
static int fcoe_vport_create(struct fc_vport *, bool disabled);
static int fcoe_vport_disable(struct fc_vport *, bool disable);
static void fcoe_set_vport_symbolic_name(struct fc_vport *);
static void fcoe_set_port_id(struct fc_lport *, u32, struct fc_frame *);
static struct libfc_function_template fcoe_libfc_fcn_templ = {
.frame_send = fcoe_xmit,
.ddp_setup = fcoe_ddp_setup,
.ddp_done = fcoe_ddp_done,
.elsct_send = fcoe_elsct_send,
.get_lesb = fcoe_get_lesb,
.lport_set_port_id = fcoe_set_port_id,
};
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,
.vport_create = fcoe_vport_create,
.vport_delete = fcoe_vport_destroy,
.vport_disable = fcoe_vport_disable,
.set_vport_symbolic_name = fcoe_set_vport_symbolic_name,
.bsg_request = fc_lport_bsg_request,
};
struct fc_function_template fcoe_vport_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,
.bsg_request = fc_lport_bsg_request,
};
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 = 3,
.can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
.use_clustering = ENABLE_CLUSTERING,
.sg_tablesize = SG_ALL,
.max_sectors = 0xffff,
};
/**
* fcoe_interface_setup() - Setup a FCoE interface
* @fcoe: The new FCoE interface
* @netdev: The net device that the fcoe interface is on
*
* 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;
struct net_device *real_dev;
u8 flogi_maddr[ETH_ALEN];
const struct net_device_ops *ops;
fcoe->netdev = netdev;
/* Let LLD initialize for FCoE */
ops = netdev->netdev_ops;
if (ops->ndo_fcoe_enable) {
if (ops->ndo_fcoe_enable(netdev))
FCOE_NETDEV_DBG(netdev, "Failed to enable FCoE"
" specific feature for LLD.\n");
}
/* 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)) {
FCOE_NETDEV_DBG(netdev, "Bonded interfaces not supported\n");
return -EOPNOTSUPP;
}
/* look for SAN MAC address, if multiple SAN MACs exist, only
* use the first one for SPMA */
real_dev = (netdev->priv_flags & IFF_802_1Q_VLAN) ?
vlan_dev_real_dev(netdev) : netdev;
rcu_read_lock();
for_each_dev_addr(real_dev, ha) {
if ((ha->type == NETDEV_HW_ADDR_T_SAN) &&
(is_valid_ether_addr(ha->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_uc_add(netdev, flogi_maddr);
if (fip->spma)
dev_uc_add(netdev, fip->ctl_src_addr);
dev_mc_add(netdev, FIP_ALL_ENODE_MACS);
/*
* 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;
}
/**
* fcoe_interface_create() - Create a FCoE interface on a net device
* @netdev: The net device to create the FCoE interface on
*
* 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;
int err;
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->ctlr.get_src_addr = fcoe_get_src_mac;
err = fcoe_interface_setup(fcoe, netdev);
if (err) {
fcoe_ctlr_destroy(&fcoe->ctlr);
kfree(fcoe);
dev_put(netdev);
return NULL;
}
return fcoe;
}
/**
* fcoe_interface_cleanup() - Clean up a FCoE interface
* @fcoe: The FCoE interface to be cleaned up
*
* 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];
const struct net_device_ops *ops;
/*
* 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_uc_del(netdev, flogi_maddr);
if (fip->spma)
dev_uc_del(netdev, fip->ctl_src_addr);
dev_mc_del(netdev, FIP_ALL_ENODE_MACS);
/* Tell the LLD we are done w/ FCoE */
ops = netdev->netdev_ops;
if (ops->ndo_fcoe_disable) {
if (ops->ndo_fcoe_disable(netdev))
FCOE_NETDEV_DBG(netdev, "Failed to disable FCoE"
" specific feature for LLD.\n");
}
}
/**
* 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() - Get a reference to a FCoE interface
* @fcoe: The FCoE interface to be held
*/
static inline void fcoe_interface_get(struct fcoe_interface *fcoe)
{
kref_get(&fcoe->kref);
}
/**
* fcoe_interface_put() - Put a reference to a FCoE interface
* @fcoe: The FCoE interface to be released
*/
static inline void fcoe_interface_put(struct fcoe_interface *fcoe)
{
kref_put(&fcoe->kref, fcoe_interface_release);
}
/**
* fcoe_fip_recv() - Handler for received FIP frames
* @skb: The receive skb
* @netdev: The associated net device
* @ptype: The packet_type structure which was used to register this handler
* @orig_dev: The original net_device the the skb was received on.
* (in case dev is a bond)
*
* Returns: 0 for success
*/
static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *netdev,
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: The FCoE controller
* @skb: The FIP packet to be sent
*/
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 the Ethernet MAC filters
* @lport: The local port to update the source MAC on
* @addr: 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 fc_lport *lport, u8 *addr)
{
struct fcoe_port *port = lport_priv(lport);
struct fcoe_interface *fcoe = port->fcoe;
rtnl_lock();
if (!is_zero_ether_addr(port->data_src_addr))
dev_uc_del(fcoe->netdev, port->data_src_addr);
if (!is_zero_ether_addr(addr))
dev_uc_add(fcoe->netdev, addr);
memcpy(port->data_src_addr, addr, ETH_ALEN);
rtnl_unlock();
}
/**
* fcoe_get_src_mac() - return the Ethernet source address for an lport
* @lport: libfc lport
*/
static u8 *fcoe_get_src_mac(struct fc_lport *lport)
{
struct fcoe_port *port = lport_priv(lport);
return port->data_src_addr;
}
/**
* fcoe_lport_config() - Set up a local port
* @lport: The local port to be setup
*
* Returns: 0 for success
*/
static int fcoe_lport_config(struct fc_lport *lport)
{
lport->link_up = 0;
lport->qfull = 0;
lport->max_retry_count = 3;
lport->max_rport_retry_count = 3;
lport->e_d_tov = 2 * 1000; /* FC-FS default */
lport->r_a_tov = 2 * 2 * 1000;
lport->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS |
FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL);
lport->does_npiv = 1;
fc_lport_init_stats(lport);
/* lport fc_lport related configuration */
fc_lport_config(lport);
/* offload related configuration */
lport->crc_offload = 0;
lport->seq_offload = 0;
lport->lro_enabled = 0;
lport->lro_xid = 0;
lport->lso_max = 0;
return 0;
}
/**
* fcoe_queue_timer() - The fcoe queue timer
* @lport: The local port
*
* Calls fcoe_check_wait_queue on timeout
*/
static void fcoe_queue_timer(ulong lport)
{
fcoe_check_wait_queue((struct fc_lport *)lport, NULL);
}
/**
* fcoe_get_wwn() - Get the world wide name from LLD if it supports it
* @netdev: the associated net device
* @wwn: the output WWN
* @type: the type of WWN (WWPN or WWNN)
*
* Returns: 0 for success
*/
static int fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type)
{
const struct net_device_ops *ops = netdev->netdev_ops;
if (ops->ndo_fcoe_get_wwn)
return ops->ndo_fcoe_get_wwn(netdev, wwn, type);
return -EINVAL;
}
/**
* fcoe_netdev_config() - Set up net devive for SW FCoE
* @lport: The local port that is associated with the net device
* @netdev: The associated net device
*
* Must be called after fcoe_lport_config() as it will use local port mutex
*
* Returns: 0 for success
*/
static int fcoe_netdev_config(struct fc_lport *lport, struct net_device *netdev)
{
u32 mfs;
u64 wwnn, wwpn;
struct fcoe_interface *fcoe;
struct fcoe_port *port;
int vid = 0;
/* Setup lport private data to point to fcoe softc */
port = lport_priv(lport);
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;
if (netdev->features & NETIF_F_FCOE_MTU) {
mfs = FCOE_MTU;
FCOE_NETDEV_DBG(netdev, "Supports FCOE_MTU of %d bytes\n", mfs);
}
mfs -= (sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof));
if (fc_set_mfs(lport, mfs))
return -EINVAL;
/* offload features support */
if (netdev->features & NETIF_F_SG)
lport->sg_supp = 1;
if (netdev->features & NETIF_F_FCOE_CRC) {
lport->crc_offload = 1;
FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n");
}
if (netdev->features & NETIF_F_FSO) {
lport->seq_offload = 1;
lport->lso_max = netdev->gso_max_size;
FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n",
lport->lso_max);
}
if (netdev->fcoe_ddp_xid) {
lport->lro_enabled = 1;
lport->lro_xid = netdev->fcoe_ddp_xid;
FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n",
lport->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)lport);
fcoe_link_speed_update(lport);
if (!lport->vport) {
/*
* Use NAA 1&2 (FC-FS Rev. 2.0, Sec. 15) to generate WWNN/WWPN:
* For WWNN, we use NAA 1 w/ bit 27-16 of word 0 as 0.
* For WWPN, we use NAA 2 w/ bit 27-16 of word 0 from VLAN ID
*/
if (netdev->priv_flags & IFF_802_1Q_VLAN)
vid = vlan_dev_vlan_id(netdev);
if (fcoe_get_wwn(netdev, &wwnn, NETDEV_FCOE_WWNN))
wwnn = fcoe_wwn_from_mac(fcoe->ctlr.ctl_src_addr, 1, 0);
fc_set_wwnn(lport, wwnn);
if (fcoe_get_wwn(netdev, &wwpn, NETDEV_FCOE_WWPN))
wwpn = fcoe_wwn_from_mac(fcoe->ctlr.ctl_src_addr,
2, vid);
fc_set_wwpn(lport, wwpn);
}
return 0;
}
/**
* fcoe_shost_config() - Set up the SCSI host associated with a local port
* @lport: The local port
* @dev: The device associated with the 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 *lport, struct device *dev)
{
int rc = 0;
/* lport scsi host config */
lport->host->max_lun = FCOE_MAX_LUN;
lport->host->max_id = FCOE_MAX_FCP_TARGET;
lport->host->max_channel = 0;
lport->host->max_cmd_len = FCOE_MAX_CMD_LEN;
if (lport->vport)
lport->host->transportt = fcoe_vport_transport_template;
else
lport->host->transportt = fcoe_transport_template;
/* add the new host to the SCSI-ml */
rc = scsi_add_host(lport->host, dev);
if (rc) {
FCOE_NETDEV_DBG(fcoe_netdev(lport), "fcoe_shost_config: "
"error on scsi_add_host\n");
return rc;
}
if (!lport->vport)
fc_host_max_npiv_vports(lport->host) = USHRT_MAX;
snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE,
"%s v%s over %s", FCOE_NAME, FCOE_VERSION,
fcoe_netdev(lport)->name);
return 0;
}
/**
* fcoe_oem_match() - The match routine for the offloaded exchange manager
* @fp: The I/O frame
*
* This routine will be associated with an exchange manager (EM). When
* the libfc exchange handling code is looking for an EM to use it will
* call this routine and pass it the frame that it wishes to send. This
* routine will return True if the associated EM is to be used and False
* if the echange code should continue looking for an EM.
*
* The offload EM that this routine is associated with will handle any
* packets that are for SCSI read requests.
*
* Returns: True for read types I/O, 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() - Allocate and configure an exchange manager
* @lport: The local port that the new EM will be associated with
*
* Returns: 0 on success
*/
static inline int fcoe_em_config(struct fc_lport *lport)
{
struct fcoe_port *port = lport_priv(lport);
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 (!lport->lro_enabled || !lport->lro_xid ||
(lport->lro_xid >= max_xid)) {
lport->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(lport, 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(lport, FC_CLASS_3,
FCOE_MIN_XID, lport->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 += lport->lro_xid + 1;
skip_oem:
if (!fc_exch_mgr_alloc(lport, 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() - Tear down a SW FCoE instance
* @lport: The local port to be destroyed
*
* Locking: must be called with the RTNL mutex held and RTNL mutex
* needed to be dropped by this function since not dropping RTNL
* would cause circular locking warning on synchronous fip worker
* cancelling thru fcoe_interface_put invoked by this function.
*
*/
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);
if (!is_zero_ether_addr(port->data_src_addr))
dev_uc_del(netdev, port->data_src_addr);
rtnl_unlock();
/* 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);
module_put(THIS_MODULE);
}
/**
* fcoe_ddp_setup() - Call a LLD's ddp_setup through the net device
* @lport: The local port to setup DDP for
* @xid: The exchange ID for this DDP transfer
* @sgl: The scatterlist describing this transfer
* @sgc: The number of sg items
*
* Returns: 0 if the DDP context was not configured
*/
static int fcoe_ddp_setup(struct fc_lport *lport, u16 xid,
struct scatterlist *sgl, unsigned int sgc)
{
struct net_device *netdev = fcoe_netdev(lport);
if (netdev->netdev_ops->ndo_fcoe_ddp_setup)
return netdev->netdev_ops->ndo_fcoe_ddp_setup(netdev,
xid, sgl,
sgc);
return 0;
}
/**
* fcoe_ddp_done() - Call a LLD's ddp_done through the net device
* @lport: The local port to complete DDP on
* @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 *lport, u16 xid)
{
struct net_device *netdev = fcoe_netdev(lport);
if (netdev->netdev_ops->ndo_fcoe_ddp_done)
return netdev->netdev_ops->ndo_fcoe_ddp_done(netdev, xid);
return 0;
}
/**
* fcoe_if_create() - Create a FCoE instance on an interface
* @fcoe: The FCoE interface to create a local port on
* @parent: The device pointer to be the parent in sysfs for the SCSI host
* @npiv: Indicates if the port is a vport or not
*
* Creates a fc_lport instance and a Scsi_Host instance and configure them.
*
* Returns: The allocated fc_lport or an error pointer
*/
static struct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe,
struct device *parent, int npiv)
{
struct net_device *netdev = fcoe->netdev;
struct fc_lport *lport = NULL;
struct fcoe_port *port;
int rc;
/*
* parent is only a vport if npiv is 1,
* but we'll only use vport in that case so go ahead and set it
*/
struct fc_vport *vport = dev_to_vport(parent);
FCOE_NETDEV_DBG(netdev, "Create Interface\n");
if (!npiv) {
lport = libfc_host_alloc(&fcoe_shost_template,
sizeof(struct fcoe_port));
} else {
lport = libfc_vport_create(vport,
sizeof(struct fcoe_port));
}
if (!lport) {
FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n");
rc = -ENOMEM;
goto out;
}
port = lport_priv(lport);
port->lport = lport;
port->fcoe = fcoe;
INIT_WORK(&port->destroy_work, fcoe_destroy_work);
/* configure a fc_lport including the exchange manager */
rc = fcoe_lport_config(lport);
if (rc) {
FCOE_NETDEV_DBG(netdev, "Could not configure lport for the "
"interface\n");
goto out_host_put;
}
if (npiv) {
FCOE_NETDEV_DBG(netdev, "Setting vport names, "
"%16.16llx %16.16llx\n",
vport->node_name, vport->port_name);
fc_set_wwnn(lport, vport->node_name);
fc_set_wwpn(lport, vport->port_name);
}
/* 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, 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;
}
if (!npiv) {
/*
* 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: