mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-07 14:36:40 +07:00
c826a31457
frames followed by these errors in log. [sdp] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK [sdp] Sense Key : Aborted Command [current] [sdp] Add. Sense: Data phase error This was causing some test apps to exit due to write failure under heavy load. This was due to a race around adding and removing tx frame skb in fcoe_pending_queue, Chris Leech helped me to find that brief unlocking period when pulling skb from fcoe_pending_queue in various contexts (fcoe_watchdog and fcoe_xmit) and then adding skb back into fcoe_pending_queue up on a failed fcoe_start_io could change skb/tx frame order in fcoe_pending_queue. Thanks Chris. This patch allows only single context to pull skb from fcoe_pending_queue at any time to prevent above described ordering issue/race by use of fcoe_pending_queue_active flag. This patch simplified fcoe_watchdog with modified fcoe_check_wait_queue by use of FCOE_LOW_QUEUE_DEPTH instead previously used several conditionals to clear and set lp->qfull. I think FCOE_MAX_QUEUE_DEPTH with FCOE_LOW_QUEUE_DEPTH will work better in re/setting lp->qfull and these could be fine tuned for performance. Signed-off-by: Vasu Dev <vasu.dev@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
1498 lines
36 KiB
C
1498 lines
36 KiB
C
/*
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* Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Maintained at www.Open-FCoE.org
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*/
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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/kernel.h>
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#include <linux/spinlock.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/if_ether.h>
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#include <linux/if_vlan.h>
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#include <linux/kthread.h>
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#include <linux/crc32.h>
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#include <linux/cpu.h>
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#include <linux/fs.h>
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#include <linux/sysfs.h>
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#include <linux/ctype.h>
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#include <scsi/scsi_tcq.h>
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#include <scsi/scsicam.h>
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#include <scsi/scsi_transport.h>
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#include <scsi/scsi_transport_fc.h>
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#include <net/rtnetlink.h>
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#include <scsi/fc/fc_encaps.h>
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#include <scsi/libfc.h>
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#include <scsi/fc_frame.h>
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#include <scsi/libfcoe.h>
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#include <scsi/fc_transport_fcoe.h>
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static int debug_fcoe;
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#define FCOE_MAX_QUEUE_DEPTH 256
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#define FCOE_LOW_QUEUE_DEPTH 32
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/* destination address mode */
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#define FCOE_GW_ADDR_MODE 0x00
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#define FCOE_FCOUI_ADDR_MODE 0x01
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#define FCOE_WORD_TO_BYTE 4
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MODULE_AUTHOR("Open-FCoE.org");
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MODULE_DESCRIPTION("FCoE");
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MODULE_LICENSE("GPL");
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/* fcoe host list */
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LIST_HEAD(fcoe_hostlist);
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DEFINE_RWLOCK(fcoe_hostlist_lock);
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DEFINE_TIMER(fcoe_timer, NULL, 0, 0);
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struct fcoe_percpu_s *fcoe_percpu[NR_CPUS];
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/* Function Prototyes */
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static int fcoe_check_wait_queue(struct fc_lport *);
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static void fcoe_insert_wait_queue_head(struct fc_lport *, struct sk_buff *);
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static void fcoe_insert_wait_queue(struct fc_lport *, struct sk_buff *);
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static void fcoe_recv_flogi(struct fcoe_softc *, struct fc_frame *, u8 *);
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#ifdef CONFIG_HOTPLUG_CPU
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static int fcoe_cpu_callback(struct notifier_block *, ulong, void *);
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#endif /* CONFIG_HOTPLUG_CPU */
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static int fcoe_device_notification(struct notifier_block *, ulong, void *);
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static void fcoe_dev_setup(void);
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static void fcoe_dev_cleanup(void);
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/* notification function from net device */
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static struct notifier_block fcoe_notifier = {
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.notifier_call = fcoe_device_notification,
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};
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#ifdef CONFIG_HOTPLUG_CPU
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static struct notifier_block fcoe_cpu_notifier = {
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.notifier_call = fcoe_cpu_callback,
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};
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/**
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* fcoe_create_percpu_data() - creates the associated cpu data
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* @cpu: index for the cpu where fcoe cpu data will be created
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*
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* create percpu stats block, from cpu add notifier
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*
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* Returns: none
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*/
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static void fcoe_create_percpu_data(int cpu)
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{
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struct fc_lport *lp;
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struct fcoe_softc *fc;
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write_lock_bh(&fcoe_hostlist_lock);
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list_for_each_entry(fc, &fcoe_hostlist, list) {
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lp = fc->lp;
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if (lp->dev_stats[cpu] == NULL)
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lp->dev_stats[cpu] =
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kzalloc(sizeof(struct fcoe_dev_stats),
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GFP_KERNEL);
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}
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write_unlock_bh(&fcoe_hostlist_lock);
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}
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/**
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* fcoe_destroy_percpu_data() - destroys the associated cpu data
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* @cpu: index for the cpu where fcoe cpu data will destroyed
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*
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* destroy percpu stats block called by cpu add/remove notifier
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*
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* Retuns: none
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*/
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static void fcoe_destroy_percpu_data(int cpu)
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{
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struct fc_lport *lp;
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struct fcoe_softc *fc;
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write_lock_bh(&fcoe_hostlist_lock);
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list_for_each_entry(fc, &fcoe_hostlist, list) {
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lp = fc->lp;
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kfree(lp->dev_stats[cpu]);
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lp->dev_stats[cpu] = NULL;
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}
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write_unlock_bh(&fcoe_hostlist_lock);
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}
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/**
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* fcoe_cpu_callback() - fcoe cpu hotplug event callback
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* @nfb: callback data block
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* @action: event triggering the callback
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* @hcpu: index for the cpu of this event
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*
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* this creates or destroys per cpu data for fcoe
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*
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* Returns NOTIFY_OK always.
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*/
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static int fcoe_cpu_callback(struct notifier_block *nfb, unsigned long action,
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void *hcpu)
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{
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unsigned int cpu = (unsigned long)hcpu;
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switch (action) {
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case CPU_ONLINE:
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fcoe_create_percpu_data(cpu);
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break;
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case CPU_DEAD:
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fcoe_destroy_percpu_data(cpu);
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break;
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default:
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break;
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}
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return NOTIFY_OK;
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}
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#endif /* CONFIG_HOTPLUG_CPU */
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/**
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* fcoe_rcv() - this is the fcoe receive function called by NET_RX_SOFTIRQ
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* @skb: the receive skb
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* @dev: associated net device
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* @ptype: context
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* @odldev: last device
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*
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* this function will receive the packet and build fc frame and pass it up
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*
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* Returns: 0 for success
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*/
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int fcoe_rcv(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *ptype, struct net_device *olddev)
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{
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struct fc_lport *lp;
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struct fcoe_rcv_info *fr;
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struct fcoe_softc *fc;
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struct fcoe_dev_stats *stats;
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struct fc_frame_header *fh;
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unsigned short oxid;
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int cpu_idx;
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struct fcoe_percpu_s *fps;
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fc = container_of(ptype, struct fcoe_softc, fcoe_packet_type);
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lp = fc->lp;
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if (unlikely(lp == NULL)) {
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FC_DBG("cannot find hba structure");
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goto err2;
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}
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if (unlikely(debug_fcoe)) {
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FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p tail:%p "
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"end:%p sum:%d dev:%s", skb->len, skb->data_len,
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skb->head, skb->data, skb_tail_pointer(skb),
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skb_end_pointer(skb), skb->csum,
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skb->dev ? skb->dev->name : "<NULL>");
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}
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/* check for FCOE packet type */
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if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) {
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FC_DBG("wrong FC type frame");
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goto err;
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}
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/*
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* Check for minimum frame length, and make sure required FCoE
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* and FC headers are pulled into the linear data area.
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*/
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if (unlikely((skb->len < FCOE_MIN_FRAME) ||
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!pskb_may_pull(skb, FCOE_HEADER_LEN)))
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goto err;
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skb_set_transport_header(skb, sizeof(struct fcoe_hdr));
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fh = (struct fc_frame_header *) skb_transport_header(skb);
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oxid = ntohs(fh->fh_ox_id);
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fr = fcoe_dev_from_skb(skb);
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fr->fr_dev = lp;
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fr->ptype = ptype;
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cpu_idx = 0;
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#ifdef CONFIG_SMP
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/*
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* The incoming frame exchange id(oxid) is ANDed with num of online
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* cpu bits to get cpu_idx and then this cpu_idx is used for selecting
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* a per cpu kernel thread from fcoe_percpu. In case the cpu is
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* offline or no kernel thread for derived cpu_idx then cpu_idx is
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* initialize to first online cpu index.
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*/
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cpu_idx = oxid & (num_online_cpus() - 1);
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if (!fcoe_percpu[cpu_idx] || !cpu_online(cpu_idx))
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cpu_idx = first_cpu(cpu_online_map);
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#endif
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fps = fcoe_percpu[cpu_idx];
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spin_lock_bh(&fps->fcoe_rx_list.lock);
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__skb_queue_tail(&fps->fcoe_rx_list, skb);
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if (fps->fcoe_rx_list.qlen == 1)
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wake_up_process(fps->thread);
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spin_unlock_bh(&fps->fcoe_rx_list.lock);
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return 0;
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err:
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#ifdef CONFIG_SMP
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stats = lp->dev_stats[smp_processor_id()];
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#else
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stats = lp->dev_stats[0];
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#endif
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if (stats)
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stats->ErrorFrames++;
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err2:
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kfree_skb(skb);
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return -1;
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}
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EXPORT_SYMBOL_GPL(fcoe_rcv);
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/**
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* fcoe_start_io() - pass to netdev to start xmit for fcoe
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* @skb: the skb to be xmitted
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*
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* Returns: 0 for success
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*/
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static inline int fcoe_start_io(struct sk_buff *skb)
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{
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int rc;
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skb_get(skb);
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rc = dev_queue_xmit(skb);
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if (rc != 0)
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return rc;
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kfree_skb(skb);
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return 0;
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}
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/**
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* fcoe_get_paged_crc_eof() - in case we need alloc a page for crc_eof
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* @skb: the skb to be xmitted
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* @tlen: total len
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*
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* Returns: 0 for success
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*/
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static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen)
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{
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struct fcoe_percpu_s *fps;
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struct page *page;
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int cpu_idx;
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cpu_idx = get_cpu();
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fps = fcoe_percpu[cpu_idx];
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page = fps->crc_eof_page;
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if (!page) {
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page = alloc_page(GFP_ATOMIC);
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if (!page) {
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put_cpu();
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return -ENOMEM;
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}
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fps->crc_eof_page = page;
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WARN_ON(fps->crc_eof_offset != 0);
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}
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get_page(page);
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skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page,
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fps->crc_eof_offset, tlen);
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skb->len += tlen;
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skb->data_len += tlen;
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skb->truesize += tlen;
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fps->crc_eof_offset += sizeof(struct fcoe_crc_eof);
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if (fps->crc_eof_offset >= PAGE_SIZE) {
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fps->crc_eof_page = NULL;
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fps->crc_eof_offset = 0;
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put_page(page);
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}
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put_cpu();
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return 0;
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}
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/**
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* fcoe_fc_crc() - calculates FC CRC in this fcoe skb
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* @fp: the fc_frame containg data to be checksummed
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*
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* This uses crc32() to calculate the crc for fc frame
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* Return : 32 bit crc
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*/
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u32 fcoe_fc_crc(struct fc_frame *fp)
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{
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struct sk_buff *skb = fp_skb(fp);
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struct skb_frag_struct *frag;
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unsigned char *data;
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unsigned long off, len, clen;
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u32 crc;
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unsigned i;
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crc = crc32(~0, skb->data, skb_headlen(skb));
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for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
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frag = &skb_shinfo(skb)->frags[i];
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off = frag->page_offset;
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len = frag->size;
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while (len > 0) {
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clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK));
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data = kmap_atomic(frag->page + (off >> PAGE_SHIFT),
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KM_SKB_DATA_SOFTIRQ);
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crc = crc32(crc, data + (off & ~PAGE_MASK), clen);
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kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ);
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off += clen;
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len -= clen;
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}
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}
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return crc;
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}
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EXPORT_SYMBOL_GPL(fcoe_fc_crc);
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/**
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* fcoe_xmit() - FCoE frame transmit function
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* @lp: the associated local port
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* @fp: the fc_frame to be transmitted
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*
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* Return : 0 for success
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*/
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int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp)
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{
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int wlen, rc = 0;
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u32 crc;
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struct ethhdr *eh;
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struct fcoe_crc_eof *cp;
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struct sk_buff *skb;
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struct fcoe_dev_stats *stats;
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struct fc_frame_header *fh;
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unsigned int hlen; /* header length implies the version */
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unsigned int tlen; /* trailer length */
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unsigned int elen; /* eth header, may include vlan */
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int flogi_in_progress = 0;
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struct fcoe_softc *fc;
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u8 sof, eof;
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struct fcoe_hdr *hp;
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WARN_ON((fr_len(fp) % sizeof(u32)) != 0);
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fc = lport_priv(lp);
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/*
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* if it is a flogi then we need to learn gw-addr
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* and my own fcid
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*/
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fh = fc_frame_header_get(fp);
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if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ)) {
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if (fc_frame_payload_op(fp) == ELS_FLOGI) {
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fc->flogi_oxid = ntohs(fh->fh_ox_id);
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fc->address_mode = FCOE_FCOUI_ADDR_MODE;
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fc->flogi_progress = 1;
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flogi_in_progress = 1;
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} else if (fc->flogi_progress && ntoh24(fh->fh_s_id) != 0) {
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/*
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* Here we must've gotten an SID by accepting an FLOGI
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* from a point-to-point connection. Switch to using
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* the source mac based on the SID. The destination
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* MAC in this case would have been set by receving the
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* FLOGI.
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*/
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fc_fcoe_set_mac(fc->data_src_addr, fh->fh_s_id);
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fc->flogi_progress = 0;
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}
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}
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|
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skb = fp_skb(fp);
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sof = fr_sof(fp);
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eof = fr_eof(fp);
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elen = (fc->real_dev->priv_flags & IFF_802_1Q_VLAN) ?
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sizeof(struct vlan_ethhdr) : sizeof(struct ethhdr);
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hlen = sizeof(struct fcoe_hdr);
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tlen = sizeof(struct fcoe_crc_eof);
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wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE;
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|
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/* crc offload */
|
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if (likely(lp->crc_offload)) {
|
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skb->ip_summed = CHECKSUM_COMPLETE;
|
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skb->csum_start = skb_headroom(skb);
|
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skb->csum_offset = skb->len;
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crc = 0;
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} else {
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skb->ip_summed = CHECKSUM_NONE;
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crc = fcoe_fc_crc(fp);
|
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}
|
|
|
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/* copy fc crc and eof to the skb buff */
|
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if (skb_is_nonlinear(skb)) {
|
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skb_frag_t *frag;
|
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if (fcoe_get_paged_crc_eof(skb, tlen)) {
|
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kfree_skb(skb);
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return -ENOMEM;
|
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}
|
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frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
|
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cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ)
|
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+ frag->page_offset;
|
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} else {
|
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cp = (struct fcoe_crc_eof *)skb_put(skb, tlen);
|
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}
|
|
|
|
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 netowrk/transport offsets to match mac/fcoe/fc */
|
|
skb_push(skb, elen + hlen);
|
|
skb_reset_mac_header(skb);
|
|
skb_reset_network_header(skb);
|
|
skb->mac_len = elen;
|
|
skb->protocol = htons(ETH_P_802_3);
|
|
skb->dev = fc->real_dev;
|
|
|
|
/* fill up mac and fcoe headers */
|
|
eh = eth_hdr(skb);
|
|
eh->h_proto = htons(ETH_P_FCOE);
|
|
if (fc->address_mode == FCOE_FCOUI_ADDR_MODE)
|
|
fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id);
|
|
else
|
|
/* insert GW address */
|
|
memcpy(eh->h_dest, fc->dest_addr, ETH_ALEN);
|
|
|
|
if (unlikely(flogi_in_progress))
|
|
memcpy(eh->h_source, fc->ctl_src_addr, ETH_ALEN);
|
|
else
|
|
memcpy(eh->h_source, fc->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;
|
|
|
|
/* update tx stats: regardless if LLD fails */
|
|
stats = lp->dev_stats[smp_processor_id()];
|
|
if (stats) {
|
|
stats->TxFrames++;
|
|
stats->TxWords += wlen;
|
|
}
|
|
|
|
/* send down to lld */
|
|
fr_dev(fp) = lp;
|
|
if (fc->fcoe_pending_queue.qlen)
|
|
rc = fcoe_check_wait_queue(lp);
|
|
|
|
if (rc == 0)
|
|
rc = fcoe_start_io(skb);
|
|
|
|
if (rc) {
|
|
fcoe_insert_wait_queue(lp, skb);
|
|
if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
|
|
lp->qfull = 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fcoe_xmit);
|
|
|
|
/**
|
|
* 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_softc *fc;
|
|
struct fcoe_hdr *hp;
|
|
|
|
set_user_nice(current, 19);
|
|
|
|
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)) {
|
|
FC_DBG("invalid HBA Structure");
|
|
kfree_skb(skb);
|
|
continue;
|
|
}
|
|
|
|
stats = lp->dev_stats[smp_processor_id()];
|
|
|
|
if (unlikely(debug_fcoe)) {
|
|
FC_DBG("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.
|
|
*/
|
|
fc = lport_priv(lp);
|
|
if (unlikely(fc->flogi_progress))
|
|
mac = eth_hdr(skb)->h_source;
|
|
|
|
if (skb_is_nonlinear(skb))
|
|
skb_linearize(skb); /* not ideal */
|
|
|
|
/*
|
|
* 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);
|
|
|
|
if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
|
|
if (stats) {
|
|
if (stats->ErrorFrames < 5)
|
|
FC_DBG("unknown FCoE version %x",
|
|
FC_FCOE_DECAPS_VER(hp));
|
|
stats->ErrorFrames++;
|
|
}
|
|
kfree_skb(skb);
|
|
continue;
|
|
}
|
|
|
|
skb_pull(skb, sizeof(struct fcoe_hdr));
|
|
fr_len = skb->len - sizeof(struct fcoe_crc_eof);
|
|
|
|
if (stats) {
|
|
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)
|
|
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, lp->emp, fp);
|
|
continue;
|
|
}
|
|
if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) {
|
|
if (le32_to_cpu(fr_crc(fp)) !=
|
|
~crc32(~0, skb->data, fr_len)) {
|
|
if (debug_fcoe || 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;
|
|
}
|
|
/* non flogi and non data exchanges are handled here */
|
|
if (unlikely(fc->flogi_progress))
|
|
fcoe_recv_flogi(fc, fp, mac);
|
|
fc_exch_recv(lp, lp->emp, fp);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fcoe_recv_flogi() - flogi receive function
|
|
* @fc: associated fcoe_softc
|
|
* @fp: the recieved frame
|
|
* @sa: the source address of this flogi
|
|
*
|
|
* This is responsible to parse the flogi response and sets the corresponding
|
|
* mac address for the initiator, eitehr OUI based or GW based.
|
|
*
|
|
* Returns: none
|
|
*/
|
|
static void fcoe_recv_flogi(struct fcoe_softc *fc, struct fc_frame *fp, u8 *sa)
|
|
{
|
|
struct fc_frame_header *fh;
|
|
u8 op;
|
|
|
|
fh = fc_frame_header_get(fp);
|
|
if (fh->fh_type != FC_TYPE_ELS)
|
|
return;
|
|
op = fc_frame_payload_op(fp);
|
|
if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP &&
|
|
fc->flogi_oxid == ntohs(fh->fh_ox_id)) {
|
|
/*
|
|
* FLOGI accepted.
|
|
* If the src mac addr is FC_OUI-based, then we mark the
|
|
* address_mode flag to use FC_OUI-based Ethernet DA.
|
|
* Otherwise we use the FCoE gateway addr
|
|
*/
|
|
if (!compare_ether_addr(sa, (u8[6]) FC_FCOE_FLOGI_MAC)) {
|
|
fc->address_mode = FCOE_FCOUI_ADDR_MODE;
|
|
} else {
|
|
memcpy(fc->dest_addr, sa, ETH_ALEN);
|
|
fc->address_mode = FCOE_GW_ADDR_MODE;
|
|
}
|
|
|
|
/*
|
|
* Remove any previously-set unicast MAC filter.
|
|
* Add secondary FCoE MAC address filter for our OUI.
|
|
*/
|
|
rtnl_lock();
|
|
if (compare_ether_addr(fc->data_src_addr, (u8[6]) { 0 }))
|
|
dev_unicast_delete(fc->real_dev, fc->data_src_addr,
|
|
ETH_ALEN);
|
|
fc_fcoe_set_mac(fc->data_src_addr, fh->fh_d_id);
|
|
dev_unicast_add(fc->real_dev, fc->data_src_addr, ETH_ALEN);
|
|
rtnl_unlock();
|
|
|
|
fc->flogi_progress = 0;
|
|
} else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) {
|
|
/*
|
|
* Save source MAC for point-to-point responses.
|
|
*/
|
|
memcpy(fc->dest_addr, sa, ETH_ALEN);
|
|
fc->address_mode = FCOE_GW_ADDR_MODE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* fcoe_watchdog() - fcoe timer callback
|
|
* @vp:
|
|
*
|
|
* This checks the pending queue length for fcoe and set lport qfull
|
|
* if the FCOE_MAX_QUEUE_DEPTH is reached. This is done for all fc_lport on the
|
|
* fcoe_hostlist.
|
|
*
|
|
* Returns: 0 for success
|
|
*/
|
|
void fcoe_watchdog(ulong vp)
|
|
{
|
|
struct fcoe_softc *fc;
|
|
|
|
read_lock(&fcoe_hostlist_lock);
|
|
list_for_each_entry(fc, &fcoe_hostlist, list) {
|
|
if (fc->lp)
|
|
fcoe_check_wait_queue(fc->lp);
|
|
}
|
|
read_unlock(&fcoe_hostlist_lock);
|
|
|
|
fcoe_timer.expires = jiffies + (1 * HZ);
|
|
add_timer(&fcoe_timer);
|
|
}
|
|
|
|
|
|
/**
|
|
* fcoe_check_wait_queue() - put the skb into fcoe pending xmit queue
|
|
* @lp: the fc_port for this skb
|
|
* @skb: the associated skb to be xmitted
|
|
*
|
|
* 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 time function OR
|
|
* by the next skb transmit.
|
|
*
|
|
* Returns: 0 for success
|
|
*/
|
|
static int fcoe_check_wait_queue(struct fc_lport *lp)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct fcoe_softc *fc;
|
|
int rc = -1;
|
|
|
|
fc = lport_priv(lp);
|
|
spin_lock_bh(&fc->fcoe_pending_queue.lock);
|
|
|
|
if (fc->fcoe_pending_queue_active)
|
|
goto out;
|
|
fc->fcoe_pending_queue_active = 1;
|
|
if (fc->fcoe_pending_queue.qlen) {
|
|
while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) {
|
|
spin_unlock_bh(&fc->fcoe_pending_queue.lock);
|
|
rc = fcoe_start_io(skb);
|
|
if (rc)
|
|
fcoe_insert_wait_queue_head(lp, skb);
|
|
spin_lock_bh(&fc->fcoe_pending_queue.lock);
|
|
if (rc)
|
|
break;
|
|
}
|
|
/*
|
|
* if interface pending queue is below FCOE_LOW_QUEUE_DEPTH
|
|
* then clear qfull flag.
|
|
*/
|
|
if (fc->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH)
|
|
lp->qfull = 0;
|
|
}
|
|
fc->fcoe_pending_queue_active = 0;
|
|
rc = fc->fcoe_pending_queue.qlen;
|
|
out:
|
|
spin_unlock_bh(&fc->fcoe_pending_queue.lock);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* fcoe_insert_wait_queue_head() - puts skb to fcoe pending queue head
|
|
* @lp: the fc_port for this skb
|
|
* @skb: the associated skb to be xmitted
|
|
*
|
|
* Returns: none
|
|
*/
|
|
static void fcoe_insert_wait_queue_head(struct fc_lport *lp,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct fcoe_softc *fc;
|
|
|
|
fc = lport_priv(lp);
|
|
spin_lock_bh(&fc->fcoe_pending_queue.lock);
|
|
__skb_queue_head(&fc->fcoe_pending_queue, skb);
|
|
spin_unlock_bh(&fc->fcoe_pending_queue.lock);
|
|
}
|
|
|
|
/**
|
|
* fcoe_insert_wait_queue() - put the skb into fcoe pending queue tail
|
|
* @lp: the fc_port for this skb
|
|
* @skb: the associated skb to be xmitted
|
|
*
|
|
* Returns: none
|
|
*/
|
|
static void fcoe_insert_wait_queue(struct fc_lport *lp,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct fcoe_softc *fc;
|
|
|
|
fc = lport_priv(lp);
|
|
spin_lock_bh(&fc->fcoe_pending_queue.lock);
|
|
__skb_queue_tail(&fc->fcoe_pending_queue, skb);
|
|
spin_unlock_bh(&fc->fcoe_pending_queue.lock);
|
|
}
|
|
|
|
/**
|
|
* fcoe_dev_setup() - setup link change notification interface
|
|
*/
|
|
static void fcoe_dev_setup()
|
|
{
|
|
/*
|
|
* here setup a interface specific wd time to
|
|
* monitor the link state
|
|
*/
|
|
register_netdevice_notifier(&fcoe_notifier);
|
|
}
|
|
|
|
/**
|
|
* fcoe_dev_setup() - 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 *real_dev = ptr;
|
|
struct fcoe_softc *fc;
|
|
struct fcoe_dev_stats *stats;
|
|
u32 new_link_up;
|
|
u32 mfs;
|
|
int rc = NOTIFY_OK;
|
|
|
|
read_lock(&fcoe_hostlist_lock);
|
|
list_for_each_entry(fc, &fcoe_hostlist, list) {
|
|
if (fc->real_dev == real_dev) {
|
|
lp = fc->lp;
|
|
break;
|
|
}
|
|
}
|
|
read_unlock(&fcoe_hostlist_lock);
|
|
if (lp == NULL) {
|
|
rc = NOTIFY_DONE;
|
|
goto out;
|
|
}
|
|
|
|
new_link_up = lp->link_up;
|
|
switch (event) {
|
|
case NETDEV_DOWN:
|
|
case NETDEV_GOING_DOWN:
|
|
new_link_up = 0;
|
|
break;
|
|
case NETDEV_UP:
|
|
case NETDEV_CHANGE:
|
|
new_link_up = !fcoe_link_ok(lp);
|
|
break;
|
|
case NETDEV_CHANGEMTU:
|
|
mfs = fc->real_dev->mtu -
|
|
(sizeof(struct fcoe_hdr) +
|
|
sizeof(struct fcoe_crc_eof));
|
|
if (mfs >= FC_MIN_MAX_FRAME)
|
|
fc_set_mfs(lp, mfs);
|
|
new_link_up = !fcoe_link_ok(lp);
|
|
break;
|
|
case NETDEV_REGISTER:
|
|
break;
|
|
default:
|
|
FC_DBG("unknown event %ld call", event);
|
|
}
|
|
if (lp->link_up != new_link_up) {
|
|
if (new_link_up)
|
|
fc_linkup(lp);
|
|
else {
|
|
stats = lp->dev_stats[smp_processor_id()];
|
|
if (stats)
|
|
stats->LinkFailureCount++;
|
|
fc_linkdown(lp);
|
|
fcoe_clean_pending_queue(lp);
|
|
}
|
|
}
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* fcoe_if_to_netdev() - parse a name buffer to get netdev
|
|
* @ifname: fixed array for output parsed ifname
|
|
* @buffer: incoming buffer to be copied
|
|
*
|
|
* Returns: NULL or ptr to netdeive
|
|
*/
|
|
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_netdev_to_module_owner() - finds out the nic drive moddule of the netdev
|
|
* @netdev: the target netdev
|
|
*
|
|
* Returns: ptr to the struct module, NULL for failure
|
|
*/
|
|
static struct module *
|
|
fcoe_netdev_to_module_owner(const struct net_device *netdev)
|
|
{
|
|
struct device *dev;
|
|
|
|
if (!netdev)
|
|
return NULL;
|
|
|
|
dev = netdev->dev.parent;
|
|
if (!dev)
|
|
return NULL;
|
|
|
|
if (!dev->driver)
|
|
return NULL;
|
|
|
|
return dev->driver->owner;
|
|
}
|
|
|
|
/**
|
|
* fcoe_ethdrv_get() - Hold the Ethernet driver
|
|
* @netdev: the target netdev
|
|
*
|
|
* Holds the Ethernet driver module by try_module_get() for
|
|
* the corresponding netdev.
|
|
*
|
|
* Returns: 0 for succsss
|
|
*/
|
|
static int fcoe_ethdrv_get(const struct net_device *netdev)
|
|
{
|
|
struct module *owner;
|
|
|
|
owner = fcoe_netdev_to_module_owner(netdev);
|
|
if (owner) {
|
|
printk(KERN_DEBUG "fcoe:hold driver module %s for %s\n",
|
|
module_name(owner), netdev->name);
|
|
return try_module_get(owner);
|
|
}
|
|
return -ENODEV;
|
|
}
|
|
|
|
/**
|
|
* fcoe_ethdrv_put() - Release the Ethernet driver
|
|
* @netdev: the target netdev
|
|
*
|
|
* Releases the Ethernet driver module by module_put for
|
|
* the corresponding netdev.
|
|
*
|
|
* Returns: 0 for succsss
|
|
*/
|
|
static int fcoe_ethdrv_put(const struct net_device *netdev)
|
|
{
|
|
struct module *owner;
|
|
|
|
owner = fcoe_netdev_to_module_owner(netdev);
|
|
if (owner) {
|
|
printk(KERN_DEBUG "fcoe:release driver module %s for %s\n",
|
|
module_name(owner), netdev->name);
|
|
module_put(owner);
|
|
return 0;
|
|
}
|
|
return -ENODEV;
|
|
}
|
|
|
|
/**
|
|
* fcoe_destroy() - handles the destroy from sysfs
|
|
* @buffer: expcted to be a eth if name
|
|
* @kp: associated kernel param
|
|
*
|
|
* Returns: 0 for success
|
|
*/
|
|
static int fcoe_destroy(const char *buffer, struct kernel_param *kp)
|
|
{
|
|
int rc;
|
|
struct net_device *netdev;
|
|
|
|
netdev = fcoe_if_to_netdev(buffer);
|
|
if (!netdev) {
|
|
rc = -ENODEV;
|
|
goto out_nodev;
|
|
}
|
|
/* look for existing lport */
|
|
if (!fcoe_hostlist_lookup(netdev)) {
|
|
rc = -ENODEV;
|
|
goto out_putdev;
|
|
}
|
|
/* pass to transport */
|
|
rc = fcoe_transport_release(netdev);
|
|
if (rc) {
|
|
printk(KERN_ERR "fcoe: fcoe_transport_release(%s) failed\n",
|
|
netdev->name);
|
|
rc = -EIO;
|
|
goto out_putdev;
|
|
}
|
|
fcoe_ethdrv_put(netdev);
|
|
rc = 0;
|
|
out_putdev:
|
|
dev_put(netdev);
|
|
out_nodev:
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* fcoe_create() - Handles the create call from sysfs
|
|
* @buffer: expcted to be a 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 net_device *netdev;
|
|
|
|
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_ethdrv_get(netdev);
|
|
|
|
/* pass to transport */
|
|
rc = fcoe_transport_attach(netdev);
|
|
if (rc) {
|
|
printk(KERN_ERR "fcoe: fcoe_transport_attach(%s) failed\n",
|
|
netdev->name);
|
|
fcoe_ethdrv_put(netdev);
|
|
rc = -EIO;
|
|
goto out_putdev;
|
|
}
|
|
rc = 0;
|
|
out_putdev:
|
|
dev_put(netdev);
|
|
out_nodev:
|
|
return rc;
|
|
}
|
|
|
|
module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR);
|
|
__MODULE_PARM_TYPE(create, "string");
|
|
MODULE_PARM_DESC(create, "Create fcoe port 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 port");
|
|
|
|
/**
|
|
* 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_softc *fc = lport_priv(lp);
|
|
struct net_device *dev = fc->real_dev;
|
|
struct ethtool_cmd ecmd = { ETHTOOL_GSET };
|
|
int rc = 0;
|
|
|
|
if ((dev->flags & IFF_UP) && netif_carrier_ok(dev)) {
|
|
dev = fc->phys_dev;
|
|
if (dev->ethtool_ops->get_settings) {
|
|
dev->ethtool_ops->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;
|
|
}
|
|
} else
|
|
rc = -1;
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fcoe_link_ok);
|
|
|
|
/**
|
|
* fcoe_percpu_clean() - Clear the pending skbs for an lport
|
|
* @lp: the fc_lport
|
|
*/
|
|
void fcoe_percpu_clean(struct fc_lport *lp)
|
|
{
|
|
int idx;
|
|
struct fcoe_percpu_s *pp;
|
|
struct fcoe_rcv_info *fr;
|
|
struct sk_buff_head *list;
|
|
struct sk_buff *skb, *next;
|
|
struct sk_buff *head;
|
|
|
|
for (idx = 0; idx < NR_CPUS; idx++) {
|
|
if (fcoe_percpu[idx]) {
|
|
pp = fcoe_percpu[idx];
|
|
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);
|
|
}
|
|
}
|
|
spin_unlock_bh(&pp->fcoe_rx_list.lock);
|
|
}
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(fcoe_percpu_clean);
|
|
|
|
/**
|
|
* 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_softc *fc = lport_priv(lp);
|
|
struct sk_buff *skb;
|
|
|
|
spin_lock_bh(&fc->fcoe_pending_queue.lock);
|
|
while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) {
|
|
spin_unlock_bh(&fc->fcoe_pending_queue.lock);
|
|
kfree_skb(skb);
|
|
spin_lock_bh(&fc->fcoe_pending_queue.lock);
|
|
}
|
|
spin_unlock_bh(&fc->fcoe_pending_queue.lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fcoe_clean_pending_queue);
|
|
|
|
/**
|
|
* libfc_host_alloc() - Allocate a Scsi_Host with room for the fc_lport
|
|
* @sht: ptr to the scsi host templ
|
|
* @priv_size: size of private data after fc_lport
|
|
*
|
|
* Returns: ptr to Scsi_Host
|
|
* TODO: to libfc?
|
|
*/
|
|
static inline struct Scsi_Host *
|
|
libfc_host_alloc(struct scsi_host_template *sht, int priv_size)
|
|
{
|
|
return scsi_host_alloc(sht, sizeof(struct fc_lport) + priv_size);
|
|
}
|
|
|
|
/**
|
|
* fcoe_host_alloc() - Allocate a Scsi_Host with room for the fcoe_softc
|
|
* @sht: ptr to the scsi host templ
|
|
* @priv_size: size of private data after fc_lport
|
|
*
|
|
* Returns: ptr to Scsi_Host
|
|
*/
|
|
struct Scsi_Host *fcoe_host_alloc(struct scsi_host_template *sht, int priv_size)
|
|
{
|
|
return libfc_host_alloc(sht, sizeof(struct fcoe_softc) + priv_size);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fcoe_host_alloc);
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fcoe_reset);
|
|
|
|
/**
|
|
* fcoe_wwn_from_mac() - Converts 48-bit IEEE MAC address to 64-bit FC WWN.
|
|
* @mac: mac address
|
|
* @scheme: check port
|
|
* @port: port indicator for converting
|
|
*
|
|
* Returns: u64 fc world wide name
|
|
*/
|
|
u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN],
|
|
unsigned int scheme, unsigned int port)
|
|
{
|
|
u64 wwn;
|
|
u64 host_mac;
|
|
|
|
/* The MAC is in NO, so flip only the low 48 bits */
|
|
host_mac = ((u64) mac[0] << 40) |
|
|
((u64) mac[1] << 32) |
|
|
((u64) mac[2] << 24) |
|
|
((u64) mac[3] << 16) |
|
|
((u64) mac[4] << 8) |
|
|
(u64) mac[5];
|
|
|
|
WARN_ON(host_mac >= (1ULL << 48));
|
|
wwn = host_mac | ((u64) scheme << 60);
|
|
switch (scheme) {
|
|
case 1:
|
|
WARN_ON(port != 0);
|
|
break;
|
|
case 2:
|
|
WARN_ON(port >= 0xfff);
|
|
wwn |= (u64) port << 48;
|
|
break;
|
|
default:
|
|
WARN_ON(1);
|
|
break;
|
|
}
|
|
|
|
return wwn;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac);
|
|
|
|
/**
|
|
* fcoe_hostlist_lookup_softc() - find the corresponding lport by a given device
|
|
* @device: this is currently ptr to net_device
|
|
*
|
|
* Returns: NULL or the located fcoe_softc
|
|
*/
|
|
static struct fcoe_softc *
|
|
fcoe_hostlist_lookup_softc(const struct net_device *dev)
|
|
{
|
|
struct fcoe_softc *fc;
|
|
|
|
read_lock(&fcoe_hostlist_lock);
|
|
list_for_each_entry(fc, &fcoe_hostlist, list) {
|
|
if (fc->real_dev == dev) {
|
|
read_unlock(&fcoe_hostlist_lock);
|
|
return fc;
|
|
}
|
|
}
|
|
read_unlock(&fcoe_hostlist_lock);
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* fcoe_hostlist_lookup() - Find the corresponding lport by netdev
|
|
* @netdev: ptr to net_device
|
|
*
|
|
* Returns: 0 for success
|
|
*/
|
|
struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
|
|
{
|
|
struct fcoe_softc *fc;
|
|
|
|
fc = fcoe_hostlist_lookup_softc(netdev);
|
|
|
|
return (fc) ? fc->lp : NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fcoe_hostlist_lookup);
|
|
|
|
/**
|
|
* fcoe_hostlist_add() - Add a lport to lports list
|
|
* @lp: ptr to the fc_lport to badded
|
|
*
|
|
* Returns: 0 for success
|
|
*/
|
|
int fcoe_hostlist_add(const struct fc_lport *lp)
|
|
{
|
|
struct fcoe_softc *fc;
|
|
|
|
fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp));
|
|
if (!fc) {
|
|
fc = lport_priv(lp);
|
|
write_lock_bh(&fcoe_hostlist_lock);
|
|
list_add_tail(&fc->list, &fcoe_hostlist);
|
|
write_unlock_bh(&fcoe_hostlist_lock);
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fcoe_hostlist_add);
|
|
|
|
/**
|
|
* fcoe_hostlist_remove() - remove a lport from lports list
|
|
* @lp: ptr to the fc_lport to badded
|
|
*
|
|
* Returns: 0 for success
|
|
*/
|
|
int fcoe_hostlist_remove(const struct fc_lport *lp)
|
|
{
|
|
struct fcoe_softc *fc;
|
|
|
|
fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp));
|
|
BUG_ON(!fc);
|
|
write_lock_bh(&fcoe_hostlist_lock);
|
|
list_del(&fc->list);
|
|
write_unlock_bh(&fcoe_hostlist_lock);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fcoe_hostlist_remove);
|
|
|
|
/**
|
|
* fcoe_libfc_config() - sets up libfc related properties for lport
|
|
* @lp: ptr to the fc_lport
|
|
* @tt: libfc function template
|
|
*
|
|
* Returns : 0 for success
|
|
*/
|
|
int fcoe_libfc_config(struct fc_lport *lp, struct libfc_function_template *tt)
|
|
{
|
|
/* Set the function pointers set by the LLDD */
|
|
memcpy(&lp->tt, tt, sizeof(*tt));
|
|
if (fc_fcp_init(lp))
|
|
return -ENOMEM;
|
|
fc_exch_init(lp);
|
|
fc_elsct_init(lp);
|
|
fc_lport_init(lp);
|
|
fc_rport_init(lp);
|
|
fc_disc_init(lp);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(fcoe_libfc_config);
|
|
|
|
/**
|
|
* fcoe_init() - fcoe module loading initialization
|
|
*
|
|
* Initialization routine
|
|
* 1. Will create fc transport software structure
|
|
* 2. initialize the link list of port information structure
|
|
*
|
|
* Returns 0 on success, negative on failure
|
|
*/
|
|
static int __init fcoe_init(void)
|
|
{
|
|
int cpu;
|
|
struct fcoe_percpu_s *p;
|
|
|
|
|
|
INIT_LIST_HEAD(&fcoe_hostlist);
|
|
rwlock_init(&fcoe_hostlist_lock);
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
register_cpu_notifier(&fcoe_cpu_notifier);
|
|
#endif /* CONFIG_HOTPLUG_CPU */
|
|
|
|
/*
|
|
* initialize per CPU interrupt thread
|
|
*/
|
|
for_each_online_cpu(cpu) {
|
|
p = kzalloc(sizeof(struct fcoe_percpu_s), GFP_KERNEL);
|
|
if (p) {
|
|
p->thread = kthread_create(fcoe_percpu_receive_thread,
|
|
(void *)p,
|
|
"fcoethread/%d", cpu);
|
|
|
|
/*
|
|
* if there is no error then bind the thread to the cpu
|
|
* initialize the semaphore and skb queue head
|
|
*/
|
|
if (likely(!IS_ERR(p->thread))) {
|
|
p->cpu = cpu;
|
|
fcoe_percpu[cpu] = p;
|
|
skb_queue_head_init(&p->fcoe_rx_list);
|
|
kthread_bind(p->thread, cpu);
|
|
wake_up_process(p->thread);
|
|
} else {
|
|
fcoe_percpu[cpu] = NULL;
|
|
kfree(p);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* setup link change notification
|
|
*/
|
|
fcoe_dev_setup();
|
|
|
|
setup_timer(&fcoe_timer, fcoe_watchdog, 0);
|
|
|
|
mod_timer(&fcoe_timer, jiffies + (10 * HZ));
|
|
|
|
/* initiatlize the fcoe transport */
|
|
fcoe_transport_init();
|
|
|
|
fcoe_sw_init();
|
|
|
|
return 0;
|
|
}
|
|
module_init(fcoe_init);
|
|
|
|
/**
|
|
* fcoe_exit() - fcoe module unloading cleanup
|
|
*
|
|
* Returns 0 on success, negative on failure
|
|
*/
|
|
static void __exit fcoe_exit(void)
|
|
{
|
|
u32 idx;
|
|
struct fcoe_softc *fc, *tmp;
|
|
struct fcoe_percpu_s *p;
|
|
struct sk_buff *skb;
|
|
|
|
/*
|
|
* Stop all call back interfaces
|
|
*/
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
unregister_cpu_notifier(&fcoe_cpu_notifier);
|
|
#endif /* CONFIG_HOTPLUG_CPU */
|
|
fcoe_dev_cleanup();
|
|
|
|
/*
|
|
* stop timer
|
|
*/
|
|
del_timer_sync(&fcoe_timer);
|
|
|
|
/* releases the associated fcoe transport for each lport */
|
|
list_for_each_entry_safe(fc, tmp, &fcoe_hostlist, list)
|
|
fcoe_transport_release(fc->real_dev);
|
|
|
|
for (idx = 0; idx < NR_CPUS; idx++) {
|
|
if (fcoe_percpu[idx]) {
|
|
kthread_stop(fcoe_percpu[idx]->thread);
|
|
p = fcoe_percpu[idx];
|
|
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);
|
|
if (fcoe_percpu[idx]->crc_eof_page)
|
|
put_page(fcoe_percpu[idx]->crc_eof_page);
|
|
kfree(fcoe_percpu[idx]);
|
|
}
|
|
}
|
|
|
|
/* remove sw trasnport */
|
|
fcoe_sw_exit();
|
|
|
|
/* detach the transport */
|
|
fcoe_transport_exit();
|
|
}
|
|
module_exit(fcoe_exit);
|