2e70e24151
Fixes reference counting on fcoe_instance and net_device, and adds NETDEV_UNREGISTER notifier handling so that you can unload network drivers. FCoE no longer increments the module use count for the network driver. On an NETDEV_UNREGISTER event, destroying the FCoE instance is deferred to a workqueue context to avoid RTNL deadlocks. Based in part by an earlier patch from John Fastabend John's patch description: Currently, the netdev module ref count is not decremented with module_put() when the module is unloaded while fcoe instances are present. To fix this removed reference count on netdev module completely and added functionality to netdev event handling for NETDEV_UNREGISTER events. This allows fcoe to remove devices cleanly when the netdev module is unloaded so we no longer need to hold a reference count for the netdev module. Signed-off-by: Chris Leech <christopher.leech@intel.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
/*
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* Copyright(c) 2009 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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#ifndef _FCOE_H_
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#define _FCOE_H_
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#include <linux/skbuff.h>
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#include <linux/kthread.h>
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#define FCOE_MAX_QUEUE_DEPTH 256
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#define FCOE_LOW_QUEUE_DEPTH 32
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#define FCOE_WORD_TO_BYTE 4
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#define FCOE_VERSION "0.1"
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#define FCOE_NAME "fcoe"
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#define FCOE_VENDOR "Open-FCoE.org"
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#define FCOE_MAX_LUN 255
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#define FCOE_MAX_FCP_TARGET 256
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#define FCOE_MAX_OUTSTANDING_COMMANDS 1024
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#define FCOE_MIN_XID 0x0000 /* the min xid supported by fcoe_sw */
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#define FCOE_MAX_XID 0x0FFF /* the max xid supported by fcoe_sw */
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unsigned int fcoe_debug_logging;
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module_param_named(debug_logging, fcoe_debug_logging, int, S_IRUGO|S_IWUSR);
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MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
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#define FCOE_LOGGING 0x01 /* General logging, not categorized */
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#define FCOE_NETDEV_LOGGING 0x02 /* Netdevice logging */
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#define FCOE_CHECK_LOGGING(LEVEL, CMD) \
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do { \
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if (unlikely(fcoe_debug_logging & LEVEL)) \
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do { \
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CMD; \
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} while (0); \
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} while (0)
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#define FCOE_DBG(fmt, args...) \
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FCOE_CHECK_LOGGING(FCOE_LOGGING, \
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printk(KERN_INFO "fcoe: " fmt, ##args);)
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#define FCOE_NETDEV_DBG(netdev, fmt, args...) \
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FCOE_CHECK_LOGGING(FCOE_NETDEV_LOGGING, \
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printk(KERN_INFO "fcoe: %s: " fmt, \
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netdev->name, ##args);)
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/*
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* this percpu struct for fcoe
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*/
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struct fcoe_percpu_s {
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struct task_struct *thread;
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struct sk_buff_head fcoe_rx_list;
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struct page *crc_eof_page;
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int crc_eof_offset;
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};
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/*
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* an FCoE interface, 1:1 with netdev
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*/
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struct fcoe_interface {
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struct list_head list;
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struct net_device *netdev;
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struct packet_type fcoe_packet_type;
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struct packet_type fip_packet_type;
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struct fcoe_ctlr ctlr;
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struct fc_exch_mgr *oem; /* offload exchange manager */
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struct kref kref;
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};
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/*
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* the FCoE private structure that's allocated along with the
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* Scsi_Host and libfc fc_lport structures
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*/
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struct fcoe_port {
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struct fcoe_interface *fcoe;
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struct fc_lport *lport;
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struct sk_buff_head fcoe_pending_queue;
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u8 fcoe_pending_queue_active;
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struct timer_list timer; /* queue timer */
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struct work_struct destroy_work; /* to prevent rtnl deadlocks */
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};
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#define fcoe_from_ctlr(fip) container_of(fip, struct fcoe_interface, ctlr)
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static inline struct net_device *fcoe_netdev(const struct fc_lport *lp)
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{
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return ((struct fcoe_port *)lport_priv(lp))->fcoe->netdev;
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}
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#endif /* _FCOE_H_ */
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