linux_dsm_epyc7002/drivers/scsi/fcoe/fcoe_transport.c
Thomas Gleixner a61127c213 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 335
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 111 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190530000436.567572064@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:37:06 +02:00

1057 lines
27 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
*
* Maintained at www.Open-FCoE.org
*/
#include <linux/types.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/errno.h>
#include <linux/crc32.h>
#include <scsi/libfcoe.h>
#include "libfcoe.h"
MODULE_AUTHOR("Open-FCoE.org");
MODULE_DESCRIPTION("FIP discovery protocol and FCoE transport for FCoE HBAs");
MODULE_LICENSE("GPL v2");
static int fcoe_transport_create(const char *, const struct kernel_param *);
static int fcoe_transport_destroy(const char *, const struct kernel_param *);
static int fcoe_transport_show(char *buffer, const struct kernel_param *kp);
static struct fcoe_transport *fcoe_transport_lookup(struct net_device *device);
static struct fcoe_transport *fcoe_netdev_map_lookup(struct net_device *device);
static int fcoe_transport_enable(const char *, const struct kernel_param *);
static int fcoe_transport_disable(const char *, const struct kernel_param *);
static int libfcoe_device_notification(struct notifier_block *notifier,
ulong event, void *ptr);
static LIST_HEAD(fcoe_transports);
static DEFINE_MUTEX(ft_mutex);
static LIST_HEAD(fcoe_netdevs);
static DEFINE_MUTEX(fn_mutex);
unsigned int libfcoe_debug_logging;
module_param_named(debug_logging, libfcoe_debug_logging, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
module_param_call(show, NULL, fcoe_transport_show, NULL, S_IRUSR);
__MODULE_PARM_TYPE(show, "string");
MODULE_PARM_DESC(show, " Show attached FCoE transports");
module_param_call(create, fcoe_transport_create, NULL,
(void *)FIP_MODE_FABRIC, S_IWUSR);
__MODULE_PARM_TYPE(create, "string");
MODULE_PARM_DESC(create, " Creates fcoe instance on an ethernet interface");
module_param_call(create_vn2vn, fcoe_transport_create, NULL,
(void *)FIP_MODE_VN2VN, S_IWUSR);
__MODULE_PARM_TYPE(create_vn2vn, "string");
MODULE_PARM_DESC(create_vn2vn, " Creates a VN_node to VN_node FCoE instance "
"on an Ethernet interface");
module_param_call(destroy, fcoe_transport_destroy, NULL, NULL, S_IWUSR);
__MODULE_PARM_TYPE(destroy, "string");
MODULE_PARM_DESC(destroy, " Destroys fcoe instance on an ethernet interface");
module_param_call(enable, fcoe_transport_enable, NULL, NULL, S_IWUSR);
__MODULE_PARM_TYPE(enable, "string");
MODULE_PARM_DESC(enable, " Enables fcoe on an ethernet interface.");
module_param_call(disable, fcoe_transport_disable, NULL, NULL, S_IWUSR);
__MODULE_PARM_TYPE(disable, "string");
MODULE_PARM_DESC(disable, " Disables fcoe on an ethernet interface.");
/* notification function for packets from net device */
static struct notifier_block libfcoe_notifier = {
.notifier_call = libfcoe_device_notification,
};
static const struct {
u32 fc_port_speed;
#define SPEED_2000 2000
#define SPEED_4000 4000
#define SPEED_8000 8000
#define SPEED_16000 16000
#define SPEED_32000 32000
u32 eth_port_speed;
} fcoe_port_speed_mapping[] = {
{ FC_PORTSPEED_1GBIT, SPEED_1000 },
{ FC_PORTSPEED_2GBIT, SPEED_2000 },
{ FC_PORTSPEED_4GBIT, SPEED_4000 },
{ FC_PORTSPEED_8GBIT, SPEED_8000 },
{ FC_PORTSPEED_10GBIT, SPEED_10000 },
{ FC_PORTSPEED_16GBIT, SPEED_16000 },
{ FC_PORTSPEED_20GBIT, SPEED_20000 },
{ FC_PORTSPEED_25GBIT, SPEED_25000 },
{ FC_PORTSPEED_32GBIT, SPEED_32000 },
{ FC_PORTSPEED_40GBIT, SPEED_40000 },
{ FC_PORTSPEED_50GBIT, SPEED_50000 },
{ FC_PORTSPEED_100GBIT, SPEED_100000 },
};
static inline u32 eth2fc_speed(u32 eth_port_speed)
{
int i;
for (i = 0; i < ARRAY_SIZE(fcoe_port_speed_mapping); i++) {
if (fcoe_port_speed_mapping[i].eth_port_speed == eth_port_speed)
return fcoe_port_speed_mapping[i].fc_port_speed;
}
return FC_PORTSPEED_UNKNOWN;
}
/**
* fcoe_link_speed_update() - Update the supported and actual link speeds
* @lport: The local port to update speeds for
*
* Returns: 0 if the ethtool query was successful
* -1 if the ethtool query failed
*/
int fcoe_link_speed_update(struct fc_lport *lport)
{
struct net_device *netdev = fcoe_get_netdev(lport);
struct ethtool_link_ksettings ecmd;
if (!__ethtool_get_link_ksettings(netdev, &ecmd)) {
lport->link_supported_speeds &= ~(FC_PORTSPEED_1GBIT |
FC_PORTSPEED_10GBIT |
FC_PORTSPEED_20GBIT |
FC_PORTSPEED_40GBIT);
if (ecmd.link_modes.supported[0] & (
SUPPORTED_1000baseT_Half |
SUPPORTED_1000baseT_Full |
SUPPORTED_1000baseKX_Full))
lport->link_supported_speeds |= FC_PORTSPEED_1GBIT;
if (ecmd.link_modes.supported[0] & (
SUPPORTED_10000baseT_Full |
SUPPORTED_10000baseKX4_Full |
SUPPORTED_10000baseKR_Full |
SUPPORTED_10000baseR_FEC))
lport->link_supported_speeds |= FC_PORTSPEED_10GBIT;
if (ecmd.link_modes.supported[0] & (
SUPPORTED_20000baseMLD2_Full |
SUPPORTED_20000baseKR2_Full))
lport->link_supported_speeds |= FC_PORTSPEED_20GBIT;
if (ecmd.link_modes.supported[0] & (
SUPPORTED_40000baseKR4_Full |
SUPPORTED_40000baseCR4_Full |
SUPPORTED_40000baseSR4_Full |
SUPPORTED_40000baseLR4_Full))
lport->link_supported_speeds |= FC_PORTSPEED_40GBIT;
lport->link_speed = eth2fc_speed(ecmd.base.speed);
return 0;
}
return -1;
}
EXPORT_SYMBOL_GPL(fcoe_link_speed_update);
/**
* __fcoe_get_lesb() - Get the Link Error Status Block (LESB) for a given lport
* @lport: The local port to update speeds for
* @fc_lesb: Pointer to the LESB to be filled up
* @netdev: Pointer to the netdev that is associated with the lport
*
* Note, the Link Error Status Block (LESB) for FCoE is defined in FC-BB-6
* Clause 7.11 in v1.04.
*/
void __fcoe_get_lesb(struct fc_lport *lport,
struct fc_els_lesb *fc_lesb,
struct net_device *netdev)
{
unsigned int cpu;
u32 lfc, vlfc, mdac;
struct fc_stats *stats;
struct fcoe_fc_els_lesb *lesb;
struct rtnl_link_stats64 temp;
lfc = 0;
vlfc = 0;
mdac = 0;
lesb = (struct fcoe_fc_els_lesb *)fc_lesb;
memset(lesb, 0, sizeof(*lesb));
for_each_possible_cpu(cpu) {
stats = per_cpu_ptr(lport->stats, cpu);
lfc += stats->LinkFailureCount;
vlfc += stats->VLinkFailureCount;
mdac += stats->MissDiscAdvCount;
}
lesb->lesb_link_fail = htonl(lfc);
lesb->lesb_vlink_fail = htonl(vlfc);
lesb->lesb_miss_fka = htonl(mdac);
lesb->lesb_fcs_error =
htonl(dev_get_stats(netdev, &temp)->rx_crc_errors);
}
EXPORT_SYMBOL_GPL(__fcoe_get_lesb);
/**
* fcoe_get_lesb() - Fill the FCoE Link Error Status Block
* @lport: the local port
* @fc_lesb: the link error status block
*/
void fcoe_get_lesb(struct fc_lport *lport,
struct fc_els_lesb *fc_lesb)
{
struct net_device *netdev = fcoe_get_netdev(lport);
__fcoe_get_lesb(lport, fc_lesb, netdev);
}
EXPORT_SYMBOL_GPL(fcoe_get_lesb);
/**
* fcoe_ctlr_get_lesb() - Get the Link Error Status Block (LESB) for a given
* fcoe controller device
* @ctlr_dev: The given fcoe controller device
*
*/
void fcoe_ctlr_get_lesb(struct fcoe_ctlr_device *ctlr_dev)
{
struct fcoe_ctlr *fip = fcoe_ctlr_device_priv(ctlr_dev);
struct net_device *netdev = fcoe_get_netdev(fip->lp);
struct fc_els_lesb *fc_lesb;
fc_lesb = (struct fc_els_lesb *)(&ctlr_dev->lesb);
__fcoe_get_lesb(fip->lp, fc_lesb, netdev);
}
EXPORT_SYMBOL_GPL(fcoe_ctlr_get_lesb);
void fcoe_wwn_to_str(u64 wwn, char *buf, int len)
{
u8 wwpn[8];
u64_to_wwn(wwn, wwpn);
snprintf(buf, len, "%02x%02x%02x%02x%02x%02x%02x%02x",
wwpn[0], wwpn[1], wwpn[2], wwpn[3],
wwpn[4], wwpn[5], wwpn[6], wwpn[7]);
}
EXPORT_SYMBOL_GPL(fcoe_wwn_to_str);
/**
* fcoe_validate_vport_create() - Validate a vport before creating it
* @vport: NPIV port to be created
*
* This routine is meant to add validation for a vport before creating it
* via fcoe_vport_create().
* Current validations are:
* - WWPN supplied is unique for given lport
*/
int fcoe_validate_vport_create(struct fc_vport *vport)
{
struct Scsi_Host *shost = vport_to_shost(vport);
struct fc_lport *n_port = shost_priv(shost);
struct fc_lport *vn_port;
int rc = 0;
char buf[32];
mutex_lock(&n_port->lp_mutex);
fcoe_wwn_to_str(vport->port_name, buf, sizeof(buf));
/* Check if the wwpn is not same as that of the lport */
if (!memcmp(&n_port->wwpn, &vport->port_name, sizeof(u64))) {
LIBFCOE_TRANSPORT_DBG("vport WWPN 0x%s is same as that of the "
"base port WWPN\n", buf);
rc = -EINVAL;
goto out;
}
/* Check if there is any existing vport with same wwpn */
list_for_each_entry(vn_port, &n_port->vports, list) {
if (!memcmp(&vn_port->wwpn, &vport->port_name, sizeof(u64))) {
LIBFCOE_TRANSPORT_DBG("vport with given WWPN 0x%s "
"already exists\n", buf);
rc = -EINVAL;
break;
}
}
out:
mutex_unlock(&n_port->lp_mutex);
return rc;
}
EXPORT_SYMBOL_GPL(fcoe_validate_vport_create);
/**
* 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
*/
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;
}
EXPORT_SYMBOL_GPL(fcoe_get_wwn);
/**
* fcoe_fc_crc() - Calculates the CRC for a given frame
* @fp: The frame to be checksumed
*
* This uses crc32() routine to calculate the CRC for a frame
*
* Return: The 32 bit CRC value
*/
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 = skb_frag_size(frag);
while (len > 0) {
clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK));
data = kmap_atomic(
skb_frag_page(frag) + (off >> PAGE_SHIFT));
crc = crc32(crc, data + (off & ~PAGE_MASK), clen);
kunmap_atomic(data);
off += clen;
len -= clen;
}
}
return crc;
}
EXPORT_SYMBOL_GPL(fcoe_fc_crc);
/**
* fcoe_start_io() - Start FCoE I/O
* @skb: The packet to be transmitted
*
* This routine is called from the net device to start transmitting
* FCoE packets.
*
* Returns: 0 for success
*/
int fcoe_start_io(struct sk_buff *skb)
{
struct sk_buff *nskb;
int rc;
nskb = skb_clone(skb, GFP_ATOMIC);
if (!nskb)
return -ENOMEM;
rc = dev_queue_xmit(nskb);
if (rc != 0)
return rc;
kfree_skb(skb);
return 0;
}
EXPORT_SYMBOL_GPL(fcoe_start_io);
/**
* fcoe_clean_pending_queue() - Dequeue a skb and free it
* @lport: The local port to dequeue a skb on
*/
void fcoe_clean_pending_queue(struct fc_lport *lport)
{
struct fcoe_port *port = lport_priv(lport);
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);
}
EXPORT_SYMBOL_GPL(fcoe_clean_pending_queue);
/**
* fcoe_check_wait_queue() - Attempt to clear the transmit backlog
* @lport: The local port whose backlog is to be cleared
*
* This empties the wait_queue, dequeues the head of the wait_queue queue
* and calls fcoe_start_io() for each packet. If all skb have been
* transmitted it returns the qlen. If an error occurs it restores
* wait_queue (to try again later) and returns -1.
*
* The wait_queue is used when the skb transmit fails. The failed skb
* will go in the wait_queue which will be emptied by the timer function or
* by the next skb transmit.
*/
void fcoe_check_wait_queue(struct fc_lport *lport, struct sk_buff *skb)
{
struct fcoe_port *port = lport_priv(lport);
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 < port->min_queue_depth)
lport->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 > port->max_queue_depth)
lport->qfull = 1;
spin_unlock_bh(&port->fcoe_pending_queue.lock);
}
EXPORT_SYMBOL_GPL(fcoe_check_wait_queue);
/**
* fcoe_queue_timer() - The fcoe queue timer
* @lport: The local port
*
* Calls fcoe_check_wait_queue on timeout
*/
void fcoe_queue_timer(struct timer_list *t)
{
struct fcoe_port *port = from_timer(port, t, timer);
fcoe_check_wait_queue(port->lport, NULL);
}
EXPORT_SYMBOL_GPL(fcoe_queue_timer);
/**
* fcoe_get_paged_crc_eof() - Allocate a page to be used for the trailer CRC
* @skb: The packet to be transmitted
* @tlen: The total length of the trailer
* @fps: The fcoe context
*
* This routine allocates a page for frame trailers. The page is re-used if
* there is enough room left on it for the current trailer. If there isn't
* enough buffer left a new page is allocated for the trailer. Reference to
* the page from this function as well as the skbs using the page fragments
* ensure that the page is freed at the appropriate time.
*
* Returns: 0 for success
*/
int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen,
struct fcoe_percpu_s *fps)
{
struct page *page;
page = fps->crc_eof_page;
if (!page) {
page = alloc_page(GFP_ATOMIC);
if (!page)
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);
}
return 0;
}
EXPORT_SYMBOL_GPL(fcoe_get_paged_crc_eof);
/**
* fcoe_transport_lookup - find an fcoe transport that matches a netdev
* @netdev: The netdev to look for from all attached transports
*
* Returns : ptr to the fcoe transport that supports this netdev or NULL
* if not found.
*
* The ft_mutex should be held when this is called
*/
static struct fcoe_transport *fcoe_transport_lookup(struct net_device *netdev)
{
struct fcoe_transport *ft = NULL;
list_for_each_entry(ft, &fcoe_transports, list)
if (ft->match && ft->match(netdev))
return ft;
return NULL;
}
/**
* fcoe_transport_attach - Attaches an FCoE transport
* @ft: The fcoe transport to be attached
*
* Returns : 0 for success
*/
int fcoe_transport_attach(struct fcoe_transport *ft)
{
int rc = 0;
mutex_lock(&ft_mutex);
if (ft->attached) {
LIBFCOE_TRANSPORT_DBG("transport %s already attached\n",
ft->name);
rc = -EEXIST;
goto out_attach;
}
/* Add default transport to the tail */
if (strcmp(ft->name, FCOE_TRANSPORT_DEFAULT))
list_add(&ft->list, &fcoe_transports);
else
list_add_tail(&ft->list, &fcoe_transports);
ft->attached = true;
LIBFCOE_TRANSPORT_DBG("attaching transport %s\n", ft->name);
out_attach:
mutex_unlock(&ft_mutex);
return rc;
}
EXPORT_SYMBOL(fcoe_transport_attach);
/**
* fcoe_transport_detach - Detaches an FCoE transport
* @ft: The fcoe transport to be attached
*
* Returns : 0 for success
*/
int fcoe_transport_detach(struct fcoe_transport *ft)
{
int rc = 0;
struct fcoe_netdev_mapping *nm = NULL, *tmp;
mutex_lock(&ft_mutex);
if (!ft->attached) {
LIBFCOE_TRANSPORT_DBG("transport %s already detached\n",
ft->name);
rc = -ENODEV;
goto out_attach;
}
/* remove netdev mapping for this transport as it is going away */
mutex_lock(&fn_mutex);
list_for_each_entry_safe(nm, tmp, &fcoe_netdevs, list) {
if (nm->ft == ft) {
LIBFCOE_TRANSPORT_DBG("transport %s going away, "
"remove its netdev mapping for %s\n",
ft->name, nm->netdev->name);
list_del(&nm->list);
kfree(nm);
}
}
mutex_unlock(&fn_mutex);
list_del(&ft->list);
ft->attached = false;
LIBFCOE_TRANSPORT_DBG("detaching transport %s\n", ft->name);
out_attach:
mutex_unlock(&ft_mutex);
return rc;
}
EXPORT_SYMBOL(fcoe_transport_detach);
static int fcoe_transport_show(char *buffer, const struct kernel_param *kp)
{
int i, j;
struct fcoe_transport *ft = NULL;
i = j = sprintf(buffer, "Attached FCoE transports:");
mutex_lock(&ft_mutex);
list_for_each_entry(ft, &fcoe_transports, list) {
if (i >= PAGE_SIZE - IFNAMSIZ)
break;
i += snprintf(&buffer[i], IFNAMSIZ, "%s ", ft->name);
}
mutex_unlock(&ft_mutex);
if (i == j)
i += snprintf(&buffer[i], IFNAMSIZ, "none");
return i;
}
static int __init fcoe_transport_init(void)
{
register_netdevice_notifier(&libfcoe_notifier);
return 0;
}
static int fcoe_transport_exit(void)
{
struct fcoe_transport *ft;
unregister_netdevice_notifier(&libfcoe_notifier);
mutex_lock(&ft_mutex);
list_for_each_entry(ft, &fcoe_transports, list)
printk(KERN_ERR "FCoE transport %s is still attached!\n",
ft->name);
mutex_unlock(&ft_mutex);
return 0;
}
static int fcoe_add_netdev_mapping(struct net_device *netdev,
struct fcoe_transport *ft)
{
struct fcoe_netdev_mapping *nm;
nm = kmalloc(sizeof(*nm), GFP_KERNEL);
if (!nm) {
printk(KERN_ERR "Unable to allocate netdev_mapping");
return -ENOMEM;
}
nm->netdev = netdev;
nm->ft = ft;
mutex_lock(&fn_mutex);
list_add(&nm->list, &fcoe_netdevs);
mutex_unlock(&fn_mutex);
return 0;
}
static void fcoe_del_netdev_mapping(struct net_device *netdev)
{
struct fcoe_netdev_mapping *nm = NULL, *tmp;
mutex_lock(&fn_mutex);
list_for_each_entry_safe(nm, tmp, &fcoe_netdevs, list) {
if (nm->netdev == netdev) {
list_del(&nm->list);
kfree(nm);
mutex_unlock(&fn_mutex);
return;
}
}
mutex_unlock(&fn_mutex);
}
/**
* fcoe_netdev_map_lookup - find the fcoe transport that matches the netdev on which
* it was created
*
* Returns : ptr to the fcoe transport that supports this netdev or NULL
* if not found.
*
* The ft_mutex should be held when this is called
*/
static struct fcoe_transport *fcoe_netdev_map_lookup(struct net_device *netdev)
{
struct fcoe_transport *ft = NULL;
struct fcoe_netdev_mapping *nm;
mutex_lock(&fn_mutex);
list_for_each_entry(nm, &fcoe_netdevs, list) {
if (netdev == nm->netdev) {
ft = nm->ft;
mutex_unlock(&fn_mutex);
return ft;
}
}
mutex_unlock(&fn_mutex);
return NULL;
}
/**
* fcoe_if_to_netdev() - Parse a name buffer to get a net device
* @buffer: The name of the net device
*
* Returns: NULL or a 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;
}
/**
* libfcoe_device_notification() - Handler for net device events
* @notifier: The context of the notification
* @event: The type of event
* @ptr: The net device that the event was on
*
* This function is called by the Ethernet driver in case of link change event.
*
* Returns: 0 for success
*/
static int libfcoe_device_notification(struct notifier_block *notifier,
ulong event, void *ptr)
{
struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
switch (event) {
case NETDEV_UNREGISTER:
LIBFCOE_TRANSPORT_DBG("NETDEV_UNREGISTER %s\n",
netdev->name);
fcoe_del_netdev_mapping(netdev);
break;
}
return NOTIFY_OK;
}
ssize_t fcoe_ctlr_create_store(struct bus_type *bus,
const char *buf, size_t count)
{
struct net_device *netdev = NULL;
struct fcoe_transport *ft = NULL;
int rc = 0;
int err;
mutex_lock(&ft_mutex);
netdev = fcoe_if_to_netdev(buf);
if (!netdev) {
LIBFCOE_TRANSPORT_DBG("Invalid device %s.\n", buf);
rc = -ENODEV;
goto out_nodev;
}
ft = fcoe_netdev_map_lookup(netdev);
if (ft) {
LIBFCOE_TRANSPORT_DBG("transport %s already has existing "
"FCoE instance on %s.\n",
ft->name, netdev->name);
rc = -EEXIST;
goto out_putdev;
}
ft = fcoe_transport_lookup(netdev);
if (!ft) {
LIBFCOE_TRANSPORT_DBG("no FCoE transport found for %s.\n",
netdev->name);
rc = -ENODEV;
goto out_putdev;
}
/* pass to transport create */
err = ft->alloc ? ft->alloc(netdev) : -ENODEV;
if (err) {
fcoe_del_netdev_mapping(netdev);
rc = -ENOMEM;
goto out_putdev;
}
err = fcoe_add_netdev_mapping(netdev, ft);
if (err) {
LIBFCOE_TRANSPORT_DBG("failed to add new netdev mapping "
"for FCoE transport %s for %s.\n",
ft->name, netdev->name);
rc = -ENODEV;
goto out_putdev;
}
LIBFCOE_TRANSPORT_DBG("transport %s succeeded to create fcoe on %s.\n",
ft->name, netdev->name);
out_putdev:
dev_put(netdev);
out_nodev:
mutex_unlock(&ft_mutex);
if (rc)
return rc;
return count;
}
ssize_t fcoe_ctlr_destroy_store(struct bus_type *bus,
const char *buf, size_t count)
{
int rc = -ENODEV;
struct net_device *netdev = NULL;
struct fcoe_transport *ft = NULL;
mutex_lock(&ft_mutex);
netdev = fcoe_if_to_netdev(buf);
if (!netdev) {
LIBFCOE_TRANSPORT_DBG("invalid device %s.\n", buf);
goto out_nodev;
}
ft = fcoe_netdev_map_lookup(netdev);
if (!ft) {
LIBFCOE_TRANSPORT_DBG("no FCoE transport found for %s.\n",
netdev->name);
goto out_putdev;
}
/* pass to transport destroy */
rc = ft->destroy(netdev);
if (rc)
goto out_putdev;
fcoe_del_netdev_mapping(netdev);
LIBFCOE_TRANSPORT_DBG("transport %s %s to destroy fcoe on %s.\n",
ft->name, (rc) ? "failed" : "succeeded",
netdev->name);
rc = count; /* required for successful return */
out_putdev:
dev_put(netdev);
out_nodev:
mutex_unlock(&ft_mutex);
return rc;
}
/**
* fcoe_transport_create() - Create a fcoe interface
* @buffer: The name of the Ethernet interface to create on
* @kp: The associated kernel param
*
* Called from sysfs. This holds the ft_mutex while calling the
* registered fcoe transport's create function.
*
* Returns: 0 for success
*/
static int fcoe_transport_create(const char *buffer,
const struct kernel_param *kp)
{
int rc = -ENODEV;
struct net_device *netdev = NULL;
struct fcoe_transport *ft = NULL;
enum fip_mode fip_mode = (enum fip_mode)kp->arg;
mutex_lock(&ft_mutex);
netdev = fcoe_if_to_netdev(buffer);
if (!netdev) {
LIBFCOE_TRANSPORT_DBG("Invalid device %s.\n", buffer);
goto out_nodev;
}
ft = fcoe_netdev_map_lookup(netdev);
if (ft) {
LIBFCOE_TRANSPORT_DBG("transport %s already has existing "
"FCoE instance on %s.\n",
ft->name, netdev->name);
rc = -EEXIST;
goto out_putdev;
}
ft = fcoe_transport_lookup(netdev);
if (!ft) {
LIBFCOE_TRANSPORT_DBG("no FCoE transport found for %s.\n",
netdev->name);
goto out_putdev;
}
rc = fcoe_add_netdev_mapping(netdev, ft);
if (rc) {
LIBFCOE_TRANSPORT_DBG("failed to add new netdev mapping "
"for FCoE transport %s for %s.\n",
ft->name, netdev->name);
goto out_putdev;
}
/* pass to transport create */
rc = ft->create ? ft->create(netdev, fip_mode) : -ENODEV;
if (rc)
fcoe_del_netdev_mapping(netdev);
LIBFCOE_TRANSPORT_DBG("transport %s %s to create fcoe on %s.\n",
ft->name, (rc) ? "failed" : "succeeded",
netdev->name);
out_putdev:
dev_put(netdev);
out_nodev:
mutex_unlock(&ft_mutex);
return rc;
}
/**
* fcoe_transport_destroy() - Destroy a FCoE interface
* @buffer: The name of the Ethernet interface to be destroyed
* @kp: The associated kernel parameter
*
* Called from sysfs. This holds the ft_mutex while calling the
* registered fcoe transport's destroy function.
*
* Returns: 0 for success
*/
static int fcoe_transport_destroy(const char *buffer,
const struct kernel_param *kp)
{
int rc = -ENODEV;
struct net_device *netdev = NULL;
struct fcoe_transport *ft = NULL;
mutex_lock(&ft_mutex);
netdev = fcoe_if_to_netdev(buffer);
if (!netdev) {
LIBFCOE_TRANSPORT_DBG("invalid device %s.\n", buffer);
goto out_nodev;
}
ft = fcoe_netdev_map_lookup(netdev);
if (!ft) {
LIBFCOE_TRANSPORT_DBG("no FCoE transport found for %s.\n",
netdev->name);
goto out_putdev;
}
/* pass to transport destroy */
rc = ft->destroy ? ft->destroy(netdev) : -ENODEV;
fcoe_del_netdev_mapping(netdev);
LIBFCOE_TRANSPORT_DBG("transport %s %s to destroy fcoe on %s.\n",
ft->name, (rc) ? "failed" : "succeeded",
netdev->name);
out_putdev:
dev_put(netdev);
out_nodev:
mutex_unlock(&ft_mutex);
return rc;
}
/**
* fcoe_transport_disable() - Disables a FCoE interface
* @buffer: The name of the Ethernet interface to be disabled
* @kp: The associated kernel parameter
*
* Called from sysfs.
*
* Returns: 0 for success
*/
static int fcoe_transport_disable(const char *buffer,
const struct kernel_param *kp)
{
int rc = -ENODEV;
struct net_device *netdev = NULL;
struct fcoe_transport *ft = NULL;
mutex_lock(&ft_mutex);
netdev = fcoe_if_to_netdev(buffer);
if (!netdev)
goto out_nodev;
ft = fcoe_netdev_map_lookup(netdev);
if (!ft)
goto out_putdev;
rc = ft->disable ? ft->disable(netdev) : -ENODEV;
out_putdev:
dev_put(netdev);
out_nodev:
mutex_unlock(&ft_mutex);
return rc;
}
/**
* fcoe_transport_enable() - Enables a FCoE interface
* @buffer: The name of the Ethernet interface to be enabled
* @kp: The associated kernel parameter
*
* Called from sysfs.
*
* Returns: 0 for success
*/
static int fcoe_transport_enable(const char *buffer,
const struct kernel_param *kp)
{
int rc = -ENODEV;
struct net_device *netdev = NULL;
struct fcoe_transport *ft = NULL;
mutex_lock(&ft_mutex);
netdev = fcoe_if_to_netdev(buffer);
if (!netdev)
goto out_nodev;
ft = fcoe_netdev_map_lookup(netdev);
if (!ft)
goto out_putdev;
rc = ft->enable ? ft->enable(netdev) : -ENODEV;
out_putdev:
dev_put(netdev);
out_nodev:
mutex_unlock(&ft_mutex);
return rc;
}
/**
* libfcoe_init() - Initialization routine for libfcoe.ko
*/
static int __init libfcoe_init(void)
{
int rc = 0;
rc = fcoe_transport_init();
if (rc)
return rc;
rc = fcoe_sysfs_setup();
if (rc)
fcoe_transport_exit();
return rc;
}
module_init(libfcoe_init);
/**
* libfcoe_exit() - Tear down libfcoe.ko
*/
static void __exit libfcoe_exit(void)
{
fcoe_sysfs_teardown();
fcoe_transport_exit();
}
module_exit(libfcoe_exit);