2009-03-17 21:42:24 +03:00
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/*
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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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2011-01-29 03:05:37 +03:00
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#define FCOE_MIN_QUEUE_DEPTH 32
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2009-03-17 21:42:24 +03:00
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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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2009-11-03 22:45:42 +03:00
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#define FCOE_MAX_LUN 0xFFFF
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2009-03-17 21:42:24 +03:00
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#define FCOE_MAX_FCP_TARGET 256
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#define FCOE_MAX_OUTSTANDING_COMMANDS 1024
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2009-07-30 04:05:21 +04:00
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#define FCOE_MIN_XID 0x0000 /* the min xid supported by fcoe_sw */
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[SCSI] fcoe, libfc: adds per cpu exch pool within exchange manager(EM)
Adds per cpu exch pool for these reasons:-
1. Currently an EM instance is shared across all cpus to manage
all exches for all cpus. This required em_lock across all
cpus for an exch alloc, free, lookup and reset each frame
and that made em_lock expensive, so instead having per cpu
exch pool with their own per cpu pool lock will likely reduce
locking contention in fast path for an exch alloc, free and
lookup.
2. Per cpu exch pool will likely improve cache hit ratio since
all frames of an exch will be processed on the same cpu on
which exch originated.
This patch is only prep work to help in keeping complexity of next
patch low, so this patch only sets up per cpu exch pool and related
helper funcs to be used by next patch. The next patch fully makes
use of per cpu exch pool in all code paths ie. tx, rx and reset.
Divides per EM exch id range equally across all cpus to setup per
cpu exch pool. This division is such that lower bits of exch id
carries cpu number info on which exch originated, later a simple
bitwise AND operation on exch id of incoming frame with fc_cpu_mask
retrieves cpu number info to direct all frames to same cpu on which
exch originated. This required a global fc_cpu_mask and fc_cpu_order
initialized to max possible cpus number nr_cpu_ids rounded up to 2's
power, this will be used in mapping exch id and exch ptr array
index in pool during exch allocation, find or reset code paths.
Adds a check in fc_exch_mgr_alloc() to ensure specified min_xid
lower bits are zero since these bits are used to carry cpu info.
Adds and initializes struct fc_exch_pool with all required fields
to manage exches in pool.
Allocates per cpu struct fc_exch_pool with memory for exches array
for range of exches per pool. The exches array memory is followed
by struct fc_exch_pool.
Adds fc_exch_ptr_get/set() helper functions to get/set exch ptr in
pool exches array at specified array index.
Increases default FCOE_MAX_XID to 0x0FFF from 0x07EF, so that more
exches are available per cpu after above described exch id range
division across all cpus to each pool.
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@suse.de>
2009-08-26 00:58:47 +04:00
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#define FCOE_MAX_XID 0x0FFF /* the max xid supported by fcoe_sw */
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2009-03-17 21:42:24 +03:00
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2012-01-14 05:26:25 +04:00
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extern unsigned int fcoe_debug_logging;
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2009-06-11 02:30:59 +04:00
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2009-11-03 22:47:50 +03:00
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#define FCOE_LOGGING 0x01 /* General logging, not categorized */
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2009-06-11 02:30:59 +04:00
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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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2009-08-26 00:58:42 +04:00
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} while (0)
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2009-06-11 02:30:59 +04:00
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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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2009-08-26 00:58:31 +04:00
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printk(KERN_INFO "fcoe: %s: " fmt, \
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2009-06-11 02:30:59 +04:00
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netdev->name, ##args);)
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2009-11-03 22:47:50 +03:00
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/**
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* struct fcoe_interface - A FCoE interface
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* @list: Handle for a list of FCoE interfaces
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* @netdev: The associated net device
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* @fcoe_packet_type: FCoE packet type
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* @fip_packet_type: FIP packet type
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* @ctlr: The FCoE controller (for FIP)
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* @oem: The offload exchange manager for all local port
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* instances associated with this port
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* This structure is 1:1 with a net devive.
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2009-03-17 21:42:24 +03:00
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*/
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2009-08-26 00:59:30 +04:00
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struct fcoe_interface {
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2009-11-03 22:47:50 +03:00
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struct list_head list;
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struct net_device *netdev;
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2011-09-28 08:38:13 +04:00
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struct net_device *realdev;
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2009-11-03 22:47:50 +03:00
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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;
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2009-08-26 00:59:30 +04:00
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};
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2009-08-26 00:59:46 +04:00
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#define fcoe_from_ctlr(fip) container_of(fip, struct fcoe_interface, ctlr)
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2009-03-17 21:42:40 +03:00
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2009-11-03 22:47:50 +03:00
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/**
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* fcoe_netdev() - Return the net device associated with a local port
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* @lport: The local port to get the net device from
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*/
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static inline struct net_device *fcoe_netdev(const struct fc_lport *lport)
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2009-03-17 21:42:24 +03:00
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{
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2011-01-29 03:05:37 +03:00
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return ((struct fcoe_interface *)
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((struct fcoe_port *)lport_priv(lport))->priv)->netdev;
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2009-03-17 21:42:24 +03:00
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}
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#endif /* _FCOE_H_ */
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