mirror of https://gitee.com/openkylin/linux.git
2746 lines
72 KiB
C
2746 lines
72 KiB
C
/*
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* Copyright(c) 2007 - 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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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/spinlock.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/crc32.h>
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#include <linux/slab.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/fc/fc_fip.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 "fcoe.h"
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MODULE_AUTHOR("Open-FCoE.org");
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MODULE_DESCRIPTION("FCoE");
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MODULE_LICENSE("GPL v2");
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/* Performance tuning parameters for fcoe */
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static unsigned int fcoe_ddp_min;
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module_param_named(ddp_min, fcoe_ddp_min, uint, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(ddp_min, "Minimum I/O size in bytes for " \
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"Direct Data Placement (DDP).");
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DEFINE_MUTEX(fcoe_config_mutex);
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/* fcoe_percpu_clean completion. Waiter protected by fcoe_create_mutex */
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static DECLARE_COMPLETION(fcoe_flush_completion);
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/* fcoe host list */
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/* must only by accessed under the RTNL mutex */
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LIST_HEAD(fcoe_hostlist);
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DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu);
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/* Function Prototypes */
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static int fcoe_reset(struct Scsi_Host *);
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static int fcoe_xmit(struct fc_lport *, struct fc_frame *);
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static int fcoe_rcv(struct sk_buff *, struct net_device *,
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struct packet_type *, struct net_device *);
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static int fcoe_percpu_receive_thread(void *);
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static void fcoe_clean_pending_queue(struct fc_lport *);
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static void fcoe_percpu_clean(struct fc_lport *);
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static int fcoe_link_speed_update(struct fc_lport *);
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static int fcoe_link_ok(struct fc_lport *);
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static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *);
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static int fcoe_hostlist_add(const struct fc_lport *);
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static void fcoe_check_wait_queue(struct fc_lport *, struct sk_buff *);
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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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static struct fcoe_interface
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*fcoe_hostlist_lookup_port(const struct net_device *);
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static int fcoe_fip_recv(struct sk_buff *, struct net_device *,
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struct packet_type *, struct net_device *);
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static void fcoe_fip_send(struct fcoe_ctlr *, struct sk_buff *);
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static void fcoe_update_src_mac(struct fc_lport *, u8 *);
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static u8 *fcoe_get_src_mac(struct fc_lport *);
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static void fcoe_destroy_work(struct work_struct *);
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static int fcoe_ddp_setup(struct fc_lport *, u16, struct scatterlist *,
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unsigned int);
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static int fcoe_ddp_done(struct fc_lport *, u16);
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static int fcoe_cpu_callback(struct notifier_block *, unsigned long, void *);
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static int fcoe_create(const char *, struct kernel_param *);
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static int fcoe_destroy(const char *, struct kernel_param *);
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static int fcoe_enable(const char *, struct kernel_param *);
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static int fcoe_disable(const char *, struct kernel_param *);
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static struct fc_seq *fcoe_elsct_send(struct fc_lport *,
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u32 did, struct fc_frame *,
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unsigned int op,
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void (*resp)(struct fc_seq *,
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struct fc_frame *,
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void *),
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void *, u32 timeout);
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static void fcoe_recv_frame(struct sk_buff *skb);
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static void fcoe_get_lesb(struct fc_lport *, struct fc_els_lesb *);
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module_param_call(create, fcoe_create, NULL, (void *)FIP_MODE_AUTO, S_IWUSR);
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__MODULE_PARM_TYPE(create, "string");
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MODULE_PARM_DESC(create, " Creates fcoe instance on a ethernet interface");
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module_param_call(create_vn2vn, fcoe_create, NULL,
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(void *)FIP_MODE_VN2VN, S_IWUSR);
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__MODULE_PARM_TYPE(create_vn2vn, "string");
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MODULE_PARM_DESC(create_vn2vn, " Creates a VN_node to VN_node FCoE instance "
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"on an Ethernet interface");
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module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR);
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__MODULE_PARM_TYPE(destroy, "string");
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MODULE_PARM_DESC(destroy, " Destroys fcoe instance on a ethernet interface");
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module_param_call(enable, fcoe_enable, NULL, NULL, S_IWUSR);
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__MODULE_PARM_TYPE(enable, "string");
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MODULE_PARM_DESC(enable, " Enables fcoe on a ethernet interface.");
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module_param_call(disable, fcoe_disable, NULL, NULL, S_IWUSR);
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__MODULE_PARM_TYPE(disable, "string");
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MODULE_PARM_DESC(disable, " Disables fcoe on a ethernet interface.");
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/* notification function for packets 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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/* notification function for CPU hotplug events */
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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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static struct scsi_transport_template *fcoe_transport_template;
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static struct scsi_transport_template *fcoe_vport_transport_template;
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static int fcoe_vport_destroy(struct fc_vport *);
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static int fcoe_vport_create(struct fc_vport *, bool disabled);
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static int fcoe_vport_disable(struct fc_vport *, bool disable);
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static void fcoe_set_vport_symbolic_name(struct fc_vport *);
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static void fcoe_set_port_id(struct fc_lport *, u32, struct fc_frame *);
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static struct libfc_function_template fcoe_libfc_fcn_templ = {
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.frame_send = fcoe_xmit,
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.ddp_setup = fcoe_ddp_setup,
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.ddp_done = fcoe_ddp_done,
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.elsct_send = fcoe_elsct_send,
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.get_lesb = fcoe_get_lesb,
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.lport_set_port_id = fcoe_set_port_id,
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};
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struct fc_function_template fcoe_transport_function = {
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.show_host_node_name = 1,
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.show_host_port_name = 1,
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.show_host_supported_classes = 1,
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.show_host_supported_fc4s = 1,
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.show_host_active_fc4s = 1,
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.show_host_maxframe_size = 1,
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.show_host_port_id = 1,
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.show_host_supported_speeds = 1,
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.get_host_speed = fc_get_host_speed,
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.show_host_speed = 1,
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.show_host_port_type = 1,
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.get_host_port_state = fc_get_host_port_state,
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.show_host_port_state = 1,
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.show_host_symbolic_name = 1,
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.dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
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.show_rport_maxframe_size = 1,
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.show_rport_supported_classes = 1,
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.show_host_fabric_name = 1,
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.show_starget_node_name = 1,
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.show_starget_port_name = 1,
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.show_starget_port_id = 1,
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.set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
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.show_rport_dev_loss_tmo = 1,
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.get_fc_host_stats = fc_get_host_stats,
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.issue_fc_host_lip = fcoe_reset,
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.terminate_rport_io = fc_rport_terminate_io,
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.vport_create = fcoe_vport_create,
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.vport_delete = fcoe_vport_destroy,
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.vport_disable = fcoe_vport_disable,
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.set_vport_symbolic_name = fcoe_set_vport_symbolic_name,
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.bsg_request = fc_lport_bsg_request,
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};
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struct fc_function_template fcoe_vport_transport_function = {
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.show_host_node_name = 1,
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.show_host_port_name = 1,
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.show_host_supported_classes = 1,
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.show_host_supported_fc4s = 1,
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.show_host_active_fc4s = 1,
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.show_host_maxframe_size = 1,
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.show_host_port_id = 1,
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.show_host_supported_speeds = 1,
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.get_host_speed = fc_get_host_speed,
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.show_host_speed = 1,
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.show_host_port_type = 1,
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.get_host_port_state = fc_get_host_port_state,
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.show_host_port_state = 1,
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.show_host_symbolic_name = 1,
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.dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
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.show_rport_maxframe_size = 1,
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.show_rport_supported_classes = 1,
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.show_host_fabric_name = 1,
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.show_starget_node_name = 1,
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.show_starget_port_name = 1,
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.show_starget_port_id = 1,
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.set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
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.show_rport_dev_loss_tmo = 1,
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.get_fc_host_stats = fc_get_host_stats,
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.issue_fc_host_lip = fcoe_reset,
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.terminate_rport_io = fc_rport_terminate_io,
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.bsg_request = fc_lport_bsg_request,
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};
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static struct scsi_host_template fcoe_shost_template = {
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.module = THIS_MODULE,
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.name = "FCoE Driver",
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.proc_name = FCOE_NAME,
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.queuecommand = fc_queuecommand,
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.eh_abort_handler = fc_eh_abort,
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.eh_device_reset_handler = fc_eh_device_reset,
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.eh_host_reset_handler = fc_eh_host_reset,
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.slave_alloc = fc_slave_alloc,
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.change_queue_depth = fc_change_queue_depth,
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.change_queue_type = fc_change_queue_type,
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.this_id = -1,
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.cmd_per_lun = 3,
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.can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
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.use_clustering = ENABLE_CLUSTERING,
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.sg_tablesize = SG_ALL,
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.max_sectors = 0xffff,
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};
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/**
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* fcoe_interface_setup() - Setup a FCoE interface
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* @fcoe: The new FCoE interface
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* @netdev: The net device that the fcoe interface is on
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*
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* Returns : 0 for success
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* Locking: must be called with the RTNL mutex held
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*/
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static int fcoe_interface_setup(struct fcoe_interface *fcoe,
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struct net_device *netdev)
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{
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struct fcoe_ctlr *fip = &fcoe->ctlr;
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struct netdev_hw_addr *ha;
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struct net_device *real_dev;
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u8 flogi_maddr[ETH_ALEN];
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const struct net_device_ops *ops;
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fcoe->netdev = netdev;
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/* Let LLD initialize for FCoE */
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ops = netdev->netdev_ops;
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if (ops->ndo_fcoe_enable) {
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if (ops->ndo_fcoe_enable(netdev))
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FCOE_NETDEV_DBG(netdev, "Failed to enable FCoE"
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" specific feature for LLD.\n");
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}
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/* Do not support for bonding device */
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if ((netdev->priv_flags & IFF_MASTER_ALB) ||
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(netdev->priv_flags & IFF_SLAVE_INACTIVE) ||
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(netdev->priv_flags & IFF_MASTER_8023AD)) {
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FCOE_NETDEV_DBG(netdev, "Bonded interfaces not supported\n");
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return -EOPNOTSUPP;
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}
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/* look for SAN MAC address, if multiple SAN MACs exist, only
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* use the first one for SPMA */
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real_dev = (netdev->priv_flags & IFF_802_1Q_VLAN) ?
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vlan_dev_real_dev(netdev) : netdev;
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rcu_read_lock();
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for_each_dev_addr(real_dev, ha) {
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if ((ha->type == NETDEV_HW_ADDR_T_SAN) &&
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(is_valid_ether_addr(ha->addr))) {
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memcpy(fip->ctl_src_addr, ha->addr, ETH_ALEN);
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fip->spma = 1;
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break;
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}
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}
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rcu_read_unlock();
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/* setup Source Mac Address */
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if (!fip->spma)
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memcpy(fip->ctl_src_addr, netdev->dev_addr, netdev->addr_len);
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/*
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* Add FCoE MAC address as second unicast MAC address
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* or enter promiscuous mode if not capable of listening
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* for multiple unicast MACs.
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*/
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memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
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dev_uc_add(netdev, flogi_maddr);
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if (fip->spma)
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dev_uc_add(netdev, fip->ctl_src_addr);
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if (fip->mode == FIP_MODE_VN2VN) {
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dev_mc_add(netdev, FIP_ALL_VN2VN_MACS);
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dev_mc_add(netdev, FIP_ALL_P2P_MACS);
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} else
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dev_mc_add(netdev, FIP_ALL_ENODE_MACS);
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/*
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* setup the receive function from ethernet driver
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* on the ethertype for the given device
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*/
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fcoe->fcoe_packet_type.func = fcoe_rcv;
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fcoe->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE);
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fcoe->fcoe_packet_type.dev = netdev;
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dev_add_pack(&fcoe->fcoe_packet_type);
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fcoe->fip_packet_type.func = fcoe_fip_recv;
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fcoe->fip_packet_type.type = htons(ETH_P_FIP);
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fcoe->fip_packet_type.dev = netdev;
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dev_add_pack(&fcoe->fip_packet_type);
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return 0;
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}
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/**
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* fcoe_interface_create() - Create a FCoE interface on a net device
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* @netdev: The net device to create the FCoE interface on
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* @fip_mode: The mode to use for FIP
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*
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* Returns: pointer to a struct fcoe_interface or NULL on error
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*/
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static struct fcoe_interface *fcoe_interface_create(struct net_device *netdev,
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enum fip_state fip_mode)
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{
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struct fcoe_interface *fcoe;
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int err;
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fcoe = kzalloc(sizeof(*fcoe), GFP_KERNEL);
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if (!fcoe) {
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FCOE_NETDEV_DBG(netdev, "Could not allocate fcoe structure\n");
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return NULL;
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}
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dev_hold(netdev);
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kref_init(&fcoe->kref);
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/*
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* Initialize FIP.
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*/
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fcoe_ctlr_init(&fcoe->ctlr, fip_mode);
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fcoe->ctlr.send = fcoe_fip_send;
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fcoe->ctlr.update_mac = fcoe_update_src_mac;
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fcoe->ctlr.get_src_addr = fcoe_get_src_mac;
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err = fcoe_interface_setup(fcoe, netdev);
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if (err) {
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fcoe_ctlr_destroy(&fcoe->ctlr);
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kfree(fcoe);
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dev_put(netdev);
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return NULL;
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}
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return fcoe;
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}
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/**
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* fcoe_interface_cleanup() - Clean up a FCoE interface
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* @fcoe: The FCoE interface to be cleaned up
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*
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* Caller must be holding the RTNL mutex
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*/
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void fcoe_interface_cleanup(struct fcoe_interface *fcoe)
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{
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struct net_device *netdev = fcoe->netdev;
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struct fcoe_ctlr *fip = &fcoe->ctlr;
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u8 flogi_maddr[ETH_ALEN];
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const struct net_device_ops *ops;
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/*
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* Don't listen for Ethernet packets anymore.
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* synchronize_net() ensures that the packet handlers are not running
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* on another CPU. dev_remove_pack() would do that, this calls the
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* unsyncronized version __dev_remove_pack() to avoid multiple delays.
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*/
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__dev_remove_pack(&fcoe->fcoe_packet_type);
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__dev_remove_pack(&fcoe->fip_packet_type);
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synchronize_net();
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/* Delete secondary MAC addresses */
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memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
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dev_uc_del(netdev, flogi_maddr);
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if (fip->spma)
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dev_uc_del(netdev, fip->ctl_src_addr);
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if (fip->mode == FIP_MODE_VN2VN) {
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dev_mc_del(netdev, FIP_ALL_VN2VN_MACS);
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dev_mc_del(netdev, FIP_ALL_P2P_MACS);
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} else
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dev_mc_del(netdev, FIP_ALL_ENODE_MACS);
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/* Tell the LLD we are done w/ FCoE */
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ops = netdev->netdev_ops;
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if (ops->ndo_fcoe_disable) {
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if (ops->ndo_fcoe_disable(netdev))
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FCOE_NETDEV_DBG(netdev, "Failed to disable FCoE"
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" specific feature for LLD.\n");
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}
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}
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/**
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* fcoe_interface_release() - fcoe_port kref release function
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* @kref: Embedded reference count in an fcoe_interface struct
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*/
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static void fcoe_interface_release(struct kref *kref)
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{
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struct fcoe_interface *fcoe;
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struct net_device *netdev;
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|
|
|
fcoe = container_of(kref, struct fcoe_interface, kref);
|
|
netdev = fcoe->netdev;
|
|
/* tear-down the FCoE controller */
|
|
fcoe_ctlr_destroy(&fcoe->ctlr);
|
|
kfree(fcoe);
|
|
dev_put(netdev);
|
|
}
|
|
|
|
/**
|
|
* fcoe_interface_get() - Get a reference to a FCoE interface
|
|
* @fcoe: The FCoE interface to be held
|
|
*/
|
|
static inline void fcoe_interface_get(struct fcoe_interface *fcoe)
|
|
{
|
|
kref_get(&fcoe->kref);
|
|
}
|
|
|
|
/**
|
|
* fcoe_interface_put() - Put a reference to a FCoE interface
|
|
* @fcoe: The FCoE interface to be released
|
|
*/
|
|
static inline void fcoe_interface_put(struct fcoe_interface *fcoe)
|
|
{
|
|
kref_put(&fcoe->kref, fcoe_interface_release);
|
|
}
|
|
|
|
/**
|
|
* fcoe_fip_recv() - Handler for received FIP frames
|
|
* @skb: The receive skb
|
|
* @netdev: The associated net device
|
|
* @ptype: The packet_type structure which was used to register this handler
|
|
* @orig_dev: The original net_device the the skb was received on.
|
|
* (in case dev is a bond)
|
|
*
|
|
* Returns: 0 for success
|
|
*/
|
|
static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *netdev,
|
|
struct packet_type *ptype,
|
|
struct net_device *orig_dev)
|
|
{
|
|
struct fcoe_interface *fcoe;
|
|
|
|
fcoe = container_of(ptype, struct fcoe_interface, fip_packet_type);
|
|
fcoe_ctlr_recv(&fcoe->ctlr, skb);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fcoe_fip_send() - Send an Ethernet-encapsulated FIP frame
|
|
* @fip: The FCoE controller
|
|
* @skb: The FIP packet to be sent
|
|
*/
|
|
static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
|
|
{
|
|
skb->dev = fcoe_from_ctlr(fip)->netdev;
|
|
dev_queue_xmit(skb);
|
|
}
|
|
|
|
/**
|
|
* fcoe_update_src_mac() - Update the Ethernet MAC filters
|
|
* @lport: The local port to update the source MAC on
|
|
* @addr: Unicast MAC address to add
|
|
*
|
|
* Remove any previously-set unicast MAC filter.
|
|
* Add secondary FCoE MAC address filter for our OUI.
|
|
*/
|
|
static void fcoe_update_src_mac(struct fc_lport *lport, u8 *addr)
|
|
{
|
|
struct fcoe_port *port = lport_priv(lport);
|
|
struct fcoe_interface *fcoe = port->fcoe;
|
|
|
|
rtnl_lock();
|
|
if (!is_zero_ether_addr(port->data_src_addr))
|
|
dev_uc_del(fcoe->netdev, port->data_src_addr);
|
|
if (!is_zero_ether_addr(addr))
|
|
dev_uc_add(fcoe->netdev, addr);
|
|
memcpy(port->data_src_addr, addr, ETH_ALEN);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
/**
|
|
* fcoe_get_src_mac() - return the Ethernet source address for an lport
|
|
* @lport: libfc lport
|
|
*/
|
|
static u8 *fcoe_get_src_mac(struct fc_lport *lport)
|
|
{
|
|
struct fcoe_port *port = lport_priv(lport);
|
|
|
|
return port->data_src_addr;
|
|
}
|
|
|
|
/**
|
|
* fcoe_lport_config() - Set up a local port
|
|
* @lport: The local port to be setup
|
|
*
|
|
* Returns: 0 for success
|
|
*/
|
|
static int fcoe_lport_config(struct fc_lport *lport)
|
|
{
|
|
lport->link_up = 0;
|
|
lport->qfull = 0;
|
|
lport->max_retry_count = 3;
|
|
lport->max_rport_retry_count = 3;
|
|
lport->e_d_tov = 2 * 1000; /* FC-FS default */
|
|
lport->r_a_tov = 2 * 2 * 1000;
|
|
lport->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS |
|
|
FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL);
|
|
lport->does_npiv = 1;
|
|
|
|
fc_lport_init_stats(lport);
|
|
|
|
/* lport fc_lport related configuration */
|
|
fc_lport_config(lport);
|
|
|
|
/* offload related configuration */
|
|
lport->crc_offload = 0;
|
|
lport->seq_offload = 0;
|
|
lport->lro_enabled = 0;
|
|
lport->lro_xid = 0;
|
|
lport->lso_max = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fcoe_queue_timer() - The fcoe queue timer
|
|
* @lport: The local port
|
|
*
|
|
* Calls fcoe_check_wait_queue on timeout
|
|
*/
|
|
static void fcoe_queue_timer(ulong lport)
|
|
{
|
|
fcoe_check_wait_queue((struct fc_lport *)lport, NULL);
|
|
}
|
|
|
|
/**
|
|
* fcoe_get_wwn() - Get the world wide name from LLD if it supports it
|
|
* @netdev: the associated net device
|
|
* @wwn: the output WWN
|
|
* @type: the type of WWN (WWPN or WWNN)
|
|
*
|
|
* Returns: 0 for success
|
|
*/
|
|
static int fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type)
|
|
{
|
|
const struct net_device_ops *ops = netdev->netdev_ops;
|
|
|
|
if (ops->ndo_fcoe_get_wwn)
|
|
return ops->ndo_fcoe_get_wwn(netdev, wwn, type);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* fcoe_netdev_features_change - Updates the lport's offload flags based
|
|
* on the LLD netdev's FCoE feature flags
|
|
*/
|
|
static void fcoe_netdev_features_change(struct fc_lport *lport,
|
|
struct net_device *netdev)
|
|
{
|
|
mutex_lock(&lport->lp_mutex);
|
|
|
|
if (netdev->features & NETIF_F_SG)
|
|
lport->sg_supp = 1;
|
|
else
|
|
lport->sg_supp = 0;
|
|
|
|
if (netdev->features & NETIF_F_FCOE_CRC) {
|
|
lport->crc_offload = 1;
|
|
FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n");
|
|
} else {
|
|
lport->crc_offload = 0;
|
|
}
|
|
|
|
if (netdev->features & NETIF_F_FSO) {
|
|
lport->seq_offload = 1;
|
|
lport->lso_max = netdev->gso_max_size;
|
|
FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n",
|
|
lport->lso_max);
|
|
} else {
|
|
lport->seq_offload = 0;
|
|
lport->lso_max = 0;
|
|
}
|
|
|
|
if (netdev->fcoe_ddp_xid) {
|
|
lport->lro_enabled = 1;
|
|
lport->lro_xid = netdev->fcoe_ddp_xid;
|
|
FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n",
|
|
lport->lro_xid);
|
|
} else {
|
|
lport->lro_enabled = 0;
|
|
lport->lro_xid = 0;
|
|
}
|
|
|
|
mutex_unlock(&lport->lp_mutex);
|
|
}
|
|
|
|
/**
|
|
* fcoe_netdev_config() - Set up net devive for SW FCoE
|
|
* @lport: The local port that is associated with the net device
|
|
* @netdev: The associated net device
|
|
*
|
|
* Must be called after fcoe_lport_config() as it will use local port mutex
|
|
*
|
|
* Returns: 0 for success
|
|
*/
|
|
static int fcoe_netdev_config(struct fc_lport *lport, struct net_device *netdev)
|
|
{
|
|
u32 mfs;
|
|
u64 wwnn, wwpn;
|
|
struct fcoe_interface *fcoe;
|
|
struct fcoe_port *port;
|
|
|
|
/* Setup lport private data to point to fcoe softc */
|
|
port = lport_priv(lport);
|
|
fcoe = port->fcoe;
|
|
|
|
/*
|
|
* Determine max frame size based on underlying device and optional
|
|
* user-configured limit. If the MFS is too low, fcoe_link_ok()
|
|
* will return 0, so do this first.
|
|
*/
|
|
mfs = netdev->mtu;
|
|
if (netdev->features & NETIF_F_FCOE_MTU) {
|
|
mfs = FCOE_MTU;
|
|
FCOE_NETDEV_DBG(netdev, "Supports FCOE_MTU of %d bytes\n", mfs);
|
|
}
|
|
mfs -= (sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof));
|
|
if (fc_set_mfs(lport, mfs))
|
|
return -EINVAL;
|
|
|
|
/* offload features support */
|
|
fcoe_netdev_features_change(lport, netdev);
|
|
|
|
skb_queue_head_init(&port->fcoe_pending_queue);
|
|
port->fcoe_pending_queue_active = 0;
|
|
setup_timer(&port->timer, fcoe_queue_timer, (unsigned long)lport);
|
|
|
|
fcoe_link_speed_update(lport);
|
|
|
|
if (!lport->vport) {
|
|
if (fcoe_get_wwn(netdev, &wwnn, NETDEV_FCOE_WWNN))
|
|
wwnn = fcoe_wwn_from_mac(fcoe->ctlr.ctl_src_addr, 1, 0);
|
|
fc_set_wwnn(lport, wwnn);
|
|
if (fcoe_get_wwn(netdev, &wwpn, NETDEV_FCOE_WWPN))
|
|
wwpn = fcoe_wwn_from_mac(fcoe->ctlr.ctl_src_addr,
|
|
2, 0);
|
|
fc_set_wwpn(lport, wwpn);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fcoe_shost_config() - Set up the SCSI host associated with a local port
|
|
* @lport: The local port
|
|
* @dev: The device associated with the SCSI host
|
|
*
|
|
* Must be called after fcoe_lport_config() and fcoe_netdev_config()
|
|
*
|
|
* Returns: 0 for success
|
|
*/
|
|
static int fcoe_shost_config(struct fc_lport *lport, struct device *dev)
|
|
{
|
|
int rc = 0;
|
|
|
|
/* lport scsi host config */
|
|
lport->host->max_lun = FCOE_MAX_LUN;
|
|
lport->host->max_id = FCOE_MAX_FCP_TARGET;
|
|
lport->host->max_channel = 0;
|
|
lport->host->max_cmd_len = FCOE_MAX_CMD_LEN;
|
|
|
|
if (lport->vport)
|
|
lport->host->transportt = fcoe_vport_transport_template;
|
|
else
|
|
lport->host->transportt = fcoe_transport_template;
|
|
|
|
/* add the new host to the SCSI-ml */
|
|
rc = scsi_add_host(lport->host, dev);
|
|
if (rc) {
|
|
FCOE_NETDEV_DBG(fcoe_netdev(lport), "fcoe_shost_config: "
|
|
"error on scsi_add_host\n");
|
|
return rc;
|
|
}
|
|
|
|
if (!lport->vport)
|
|
fc_host_max_npiv_vports(lport->host) = USHRT_MAX;
|
|
|
|
snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE,
|
|
"%s v%s over %s", FCOE_NAME, FCOE_VERSION,
|
|
fcoe_netdev(lport)->name);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fcoe_oem_match() - The match routine for the offloaded exchange manager
|
|
* @fp: The I/O frame
|
|
*
|
|
* This routine will be associated with an exchange manager (EM). When
|
|
* the libfc exchange handling code is looking for an EM to use it will
|
|
* call this routine and pass it the frame that it wishes to send. This
|
|
* routine will return True if the associated EM is to be used and False
|
|
* if the echange code should continue looking for an EM.
|
|
*
|
|
* The offload EM that this routine is associated with will handle any
|
|
* packets that are for SCSI read requests.
|
|
*
|
|
* Returns: True for read types I/O, otherwise returns false.
|
|
*/
|
|
bool fcoe_oem_match(struct fc_frame *fp)
|
|
{
|
|
return fc_fcp_is_read(fr_fsp(fp)) &&
|
|
(fr_fsp(fp)->data_len > fcoe_ddp_min);
|
|
}
|
|
|
|
/**
|
|
* fcoe_em_config() - Allocate and configure an exchange manager
|
|
* @lport: The local port that the new EM will be associated with
|
|
*
|
|
* Returns: 0 on success
|
|
*/
|
|
static inline int fcoe_em_config(struct fc_lport *lport)
|
|
{
|
|
struct fcoe_port *port = lport_priv(lport);
|
|
struct fcoe_interface *fcoe = port->fcoe;
|
|
struct fcoe_interface *oldfcoe = NULL;
|
|
struct net_device *old_real_dev, *cur_real_dev;
|
|
u16 min_xid = FCOE_MIN_XID;
|
|
u16 max_xid = FCOE_MAX_XID;
|
|
|
|
/*
|
|
* Check if need to allocate an em instance for
|
|
* offload exchange ids to be shared across all VN_PORTs/lport.
|
|
*/
|
|
if (!lport->lro_enabled || !lport->lro_xid ||
|
|
(lport->lro_xid >= max_xid)) {
|
|
lport->lro_xid = 0;
|
|
goto skip_oem;
|
|
}
|
|
|
|
/*
|
|
* Reuse existing offload em instance in case
|
|
* it is already allocated on real eth device
|
|
*/
|
|
if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
|
|
cur_real_dev = vlan_dev_real_dev(fcoe->netdev);
|
|
else
|
|
cur_real_dev = fcoe->netdev;
|
|
|
|
list_for_each_entry(oldfcoe, &fcoe_hostlist, list) {
|
|
if (oldfcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
|
|
old_real_dev = vlan_dev_real_dev(oldfcoe->netdev);
|
|
else
|
|
old_real_dev = oldfcoe->netdev;
|
|
|
|
if (cur_real_dev == old_real_dev) {
|
|
fcoe->oem = oldfcoe->oem;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (fcoe->oem) {
|
|
if (!fc_exch_mgr_add(lport, fcoe->oem, fcoe_oem_match)) {
|
|
printk(KERN_ERR "fcoe_em_config: failed to add "
|
|
"offload em:%p on interface:%s\n",
|
|
fcoe->oem, fcoe->netdev->name);
|
|
return -ENOMEM;
|
|
}
|
|
} else {
|
|
fcoe->oem = fc_exch_mgr_alloc(lport, FC_CLASS_3,
|
|
FCOE_MIN_XID, lport->lro_xid,
|
|
fcoe_oem_match);
|
|
if (!fcoe->oem) {
|
|
printk(KERN_ERR "fcoe_em_config: failed to allocate "
|
|
"em for offload exches on interface:%s\n",
|
|
fcoe->netdev->name);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Exclude offload EM xid range from next EM xid range.
|
|
*/
|
|
min_xid += lport->lro_xid + 1;
|
|
|
|
skip_oem:
|
|
if (!fc_exch_mgr_alloc(lport, FC_CLASS_3, min_xid, max_xid, NULL)) {
|
|
printk(KERN_ERR "fcoe_em_config: failed to "
|
|
"allocate em on interface %s\n", fcoe->netdev->name);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fcoe_if_destroy() - Tear down a SW FCoE instance
|
|
* @lport: The local port to be destroyed
|
|
*
|
|
* Locking: must be called with the RTNL mutex held and RTNL mutex
|
|
* needed to be dropped by this function since not dropping RTNL
|
|
* would cause circular locking warning on synchronous fip worker
|
|
* cancelling thru fcoe_interface_put invoked by this function.
|
|
*
|
|
*/
|
|
static void fcoe_if_destroy(struct fc_lport *lport)
|
|
{
|
|
struct fcoe_port *port = lport_priv(lport);
|
|
struct fcoe_interface *fcoe = port->fcoe;
|
|
struct net_device *netdev = fcoe->netdev;
|
|
|
|
FCOE_NETDEV_DBG(netdev, "Destroying interface\n");
|
|
|
|
/* Logout of the fabric */
|
|
fc_fabric_logoff(lport);
|
|
|
|
/* Cleanup the fc_lport */
|
|
fc_lport_destroy(lport);
|
|
fc_fcp_destroy(lport);
|
|
|
|
/* Stop the transmit retry timer */
|
|
del_timer_sync(&port->timer);
|
|
|
|
/* Free existing transmit skbs */
|
|
fcoe_clean_pending_queue(lport);
|
|
|
|
if (!is_zero_ether_addr(port->data_src_addr))
|
|
dev_uc_del(netdev, port->data_src_addr);
|
|
rtnl_unlock();
|
|
|
|
/* receives may not be stopped until after this */
|
|
fcoe_interface_put(fcoe);
|
|
|
|
/* Free queued packets for the per-CPU receive threads */
|
|
fcoe_percpu_clean(lport);
|
|
|
|
/* Detach from the scsi-ml */
|
|
fc_remove_host(lport->host);
|
|
scsi_remove_host(lport->host);
|
|
|
|
/* There are no more rports or I/O, free the EM */
|
|
fc_exch_mgr_free(lport);
|
|
|
|
/* Free memory used by statistical counters */
|
|
fc_lport_free_stats(lport);
|
|
|
|
/* Release the Scsi_Host */
|
|
scsi_host_put(lport->host);
|
|
module_put(THIS_MODULE);
|
|
}
|
|
|
|
/**
|
|
* fcoe_ddp_setup() - Call a LLD's ddp_setup through the net device
|
|
* @lport: The local port to setup DDP for
|
|
* @xid: The exchange ID for this DDP transfer
|
|
* @sgl: The scatterlist describing this transfer
|
|
* @sgc: The number of sg items
|
|
*
|
|
* Returns: 0 if the DDP context was not configured
|
|
*/
|
|
static int fcoe_ddp_setup(struct fc_lport *lport, u16 xid,
|
|
struct scatterlist *sgl, unsigned int sgc)
|
|
{
|
|
struct net_device *netdev = fcoe_netdev(lport);
|
|
|
|
if (netdev->netdev_ops->ndo_fcoe_ddp_setup)
|
|
return netdev->netdev_ops->ndo_fcoe_ddp_setup(netdev,
|
|
xid, sgl,
|
|
sgc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fcoe_ddp_done() - Call a LLD's ddp_done through the net device
|
|
* @lport: The local port to complete DDP on
|
|
* @xid: The exchange ID for this DDP transfer
|
|
*
|
|
* Returns: the length of data that have been completed by DDP
|
|
*/
|
|
static int fcoe_ddp_done(struct fc_lport *lport, u16 xid)
|
|
{
|
|
struct net_device *netdev = fcoe_netdev(lport);
|
|
|
|
if (netdev->netdev_ops->ndo_fcoe_ddp_done)
|
|
return netdev->netdev_ops->ndo_fcoe_ddp_done(netdev, xid);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fcoe_if_create() - Create a FCoE instance on an interface
|
|
* @fcoe: The FCoE interface to create a local port on
|
|
* @parent: The device pointer to be the parent in sysfs for the SCSI host
|
|
* @npiv: Indicates if the port is a vport or not
|
|
*
|
|
* Creates a fc_lport instance and a Scsi_Host instance and configure them.
|
|
*
|
|
* Returns: The allocated fc_lport or an error pointer
|
|
*/
|
|
static struct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe,
|
|
struct device *parent, int npiv)
|
|
{
|
|
struct net_device *netdev = fcoe->netdev;
|
|
struct fc_lport *lport = NULL;
|
|
struct fcoe_port *port;
|
|
int rc;
|
|
/*
|
|
* parent is only a vport if npiv is 1,
|
|
* but we'll only use vport in that case so go ahead and set it
|
|
*/
|
|
struct fc_vport *vport = dev_to_vport(parent);
|
|
|
|
FCOE_NETDEV_DBG(netdev, "Create Interface\n");
|
|
|
|
if (!npiv) {
|
|
lport = libfc_host_alloc(&fcoe_shost_template,
|
|
sizeof(struct fcoe_port));
|
|
} else {
|
|
lport = libfc_vport_create(vport,
|
|
sizeof(struct fcoe_port));
|
|
}
|
|
if (!lport) {
|
|
FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n");
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
port = lport_priv(lport);
|
|
port->lport = lport;
|
|
port->fcoe = fcoe;
|
|
INIT_WORK(&port->destroy_work, fcoe_destroy_work);
|
|
|
|
/* configure a fc_lport including the exchange manager */
|
|
rc = fcoe_lport_config(lport);
|
|
if (rc) {
|
|
FCOE_NETDEV_DBG(netdev, "Could not configure lport for the "
|
|
"interface\n");
|
|
goto out_host_put;
|
|
}
|
|
|
|
if (npiv) {
|
|
FCOE_NETDEV_DBG(netdev, "Setting vport names, "
|
|
"%16.16llx %16.16llx\n",
|
|
vport->node_name, vport->port_name);
|
|
fc_set_wwnn(lport, vport->node_name);
|
|
fc_set_wwpn(lport, vport->port_name);
|
|
}
|
|
|
|
/* configure lport network properties */
|
|
rc = fcoe_netdev_config(lport, netdev);
|
|
if (rc) {
|
|
FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the "
|
|
"interface\n");
|
|
goto out_lp_destroy;
|
|
}
|
|
|
|
/* configure lport scsi host properties */
|
|
rc = fcoe_shost_config(lport, parent);
|
|
if (rc) {
|
|
FCOE_NETDEV_DBG(netdev, "Could not configure shost for the "
|
|
"interface\n");
|
|
goto out_lp_destroy;
|
|
}
|
|
|
|
/* Initialize the library */
|
|
rc = fcoe_libfc_config(lport, &fcoe->ctlr, &fcoe_libfc_fcn_templ, 1);
|
|
if (rc) {
|
|
FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the "
|
|
"interface\n");
|
|
goto out_lp_destroy;
|
|
}
|
|
|
|
if (!npiv) {
|
|
/*
|
|
* fcoe_em_alloc() and fcoe_hostlist_add() both
|
|
* need to be atomic with respect to other changes to the
|
|
* hostlist since fcoe_em_alloc() looks for an existing EM
|
|
* instance on host list updated by fcoe_hostlist_add().
|
|
*
|
|
* This is currently handled through the fcoe_config_mutex
|
|
* begin held.
|
|
*/
|
|
|
|
/* lport exch manager allocation */
|
|
rc = fcoe_em_config(lport);
|
|
if (rc) {
|
|
FCOE_NETDEV_DBG(netdev, "Could not configure the EM "
|
|
"for the interface\n");
|
|
goto out_lp_destroy;
|
|
}
|
|
}
|
|
|
|
fcoe_interface_get(fcoe);
|
|
return lport;
|
|
|
|
out_lp_destroy:
|
|
fc_exch_mgr_free(lport);
|
|
out_host_put:
|
|
scsi_host_put(lport->host);
|
|
out:
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
/**
|
|
* fcoe_if_init() - Initialization routine for fcoe.ko
|
|
*
|
|
* Attaches the SW FCoE transport to the FC transport
|
|
*
|
|
* Returns: 0 on success
|
|
*/
|
|
static int __init fcoe_if_init(void)
|
|
{
|
|
/* attach to scsi transport */
|
|
fcoe_transport_template = fc_attach_transport(&fcoe_transport_function);
|
|
fcoe_vport_transport_template =
|
|
fc_attach_transport(&fcoe_vport_transport_function);
|
|
|
|
if (!fcoe_transport_template) {
|
|
printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fcoe_if_exit() - Tear down fcoe.ko
|
|
*
|
|
* Detaches the SW FCoE transport from the FC transport
|
|
*
|
|
* Returns: 0 on success
|
|
*/
|
|
int __exit fcoe_if_exit(void)
|
|
{
|
|
fc_release_transport(fcoe_transport_template);
|
|
fc_release_transport(fcoe_vport_transport_template);
|
|
fcoe_transport_template = NULL;
|
|
fcoe_vport_transport_template = NULL;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fcoe_percpu_thread_create() - Create a receive thread for an online CPU
|
|
* @cpu: The CPU index of the CPU to create a receive thread for
|
|
*/
|
|
static void fcoe_percpu_thread_create(unsigned int cpu)
|
|
{
|
|
struct fcoe_percpu_s *p;
|
|
struct task_struct *thread;
|
|
|
|
p = &per_cpu(fcoe_percpu, cpu);
|
|
|
|
thread = kthread_create(fcoe_percpu_receive_thread,
|
|
(void *)p, "fcoethread/%d", cpu);
|
|
|
|
if (likely(!IS_ERR(thread))) {
|
|
kthread_bind(thread, cpu);
|
|
wake_up_process(thread);
|
|
|
|
spin_lock_bh(&p->fcoe_rx_list.lock);
|
|
p->thread = thread;
|
|
spin_unlock_bh(&p->fcoe_rx_list.lock);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* fcoe_percpu_thread_destroy() - Remove the receive thread of a CPU
|
|
* @cpu: The CPU index of the CPU whose receive thread is to be destroyed
|
|
*
|
|
* Destroys a per-CPU Rx thread. Any pending skbs are moved to the
|
|
* current CPU's Rx thread. If the thread being destroyed is bound to
|
|
* the CPU processing this context the skbs will be freed.
|
|
*/
|
|
static void fcoe_percpu_thread_destroy(unsigned int cpu)
|
|
{
|
|
struct fcoe_percpu_s *p;
|
|
struct task_struct *thread;
|
|
struct page *crc_eof;
|
|
struct sk_buff *skb;
|
|
#ifdef CONFIG_SMP
|
|
struct fcoe_percpu_s *p0;
|
|
unsigned targ_cpu = get_cpu();
|
|
#endif /* CONFIG_SMP */
|
|
|
|
FCOE_DBG("Destroying receive thread for CPU %d\n", cpu);
|
|
|
|
/* Prevent any new skbs from being queued for this CPU. */
|
|
p = &per_cpu(fcoe_percpu, cpu);
|
|
spin_lock_bh(&p->fcoe_rx_list.lock);
|
|
thread = p->thread;
|
|
p->thread = NULL;
|
|
crc_eof = p->crc_eof_page;
|
|
p->crc_eof_page = NULL;
|
|
p->crc_eof_offset = 0;
|
|
spin_unlock_bh(&p->fcoe_rx_list.lock);
|
|
|
|
#ifdef CONFIG_SMP
|
|
/*
|
|
* Don't bother moving the skb's if this context is running
|
|
* on the same CPU that is having its thread destroyed. This
|
|
* can easily happen when the module is removed.
|
|
*/
|
|
if (cpu != targ_cpu) {
|
|
p0 = &per_cpu(fcoe_percpu, targ_cpu);
|
|
spin_lock_bh(&p0->fcoe_rx_list.lock);
|
|
if (p0->thread) {
|
|
FCOE_DBG("Moving frames from CPU %d to CPU %d\n",
|
|
cpu, targ_cpu);
|
|
|
|
while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
|
|
__skb_queue_tail(&p0->fcoe_rx_list, skb);
|
|
spin_unlock_bh(&p0->fcoe_rx_list.lock);
|
|
} else {
|
|
/*
|
|
* The targeted CPU is not initialized and cannot accept
|
|
* new skbs. Unlock the targeted CPU and drop the skbs
|
|
* on the CPU that is going offline.
|
|
*/
|
|
while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
|
|
kfree_skb(skb);
|
|
spin_unlock_bh(&p0->fcoe_rx_list.lock);
|
|
}
|
|
} else {
|
|
/*
|
|
* This scenario occurs when the module is being removed
|
|
* and all threads are being destroyed. skbs will continue
|
|
* to be shifted from the CPU thread that is being removed
|
|
* to the CPU thread associated with the CPU that is processing
|
|
* the module removal. Once there is only one CPU Rx thread it
|
|
* will reach this case and we will drop all skbs and later
|
|
* stop the thread.
|
|
*/
|
|
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);
|
|
}
|
|
put_cpu();
|
|
#else
|
|
/*
|
|
* This a non-SMP scenario where the singular Rx thread is
|
|
* being removed. Free all skbs and stop the thread.
|
|
*/
|
|
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);
|
|
#endif
|
|
|
|
if (thread)
|
|
kthread_stop(thread);
|
|
|
|
if (crc_eof)
|
|
put_page(crc_eof);
|
|
}
|
|
|
|
/**
|
|
* fcoe_cpu_callback() - Handler for CPU hotplug events
|
|
* @nfb: The callback data block
|
|
* @action: The event triggering the callback
|
|
* @hcpu: The index of the CPU that the event is for
|
|
*
|
|
* This creates or destroys per-CPU data for fcoe
|
|
*
|
|
* Returns NOTIFY_OK always.
|
|
*/
|
|
static int fcoe_cpu_callback(struct notifier_block *nfb,
|
|
unsigned long action, void *hcpu)
|
|
{
|
|
unsigned cpu = (unsigned long)hcpu;
|
|
|
|
switch (action) {
|
|
case CPU_ONLINE:
|
|
case CPU_ONLINE_FROZEN:
|
|
FCOE_DBG("CPU %x online: Create Rx thread\n", cpu);
|
|
fcoe_percpu_thread_create(cpu);
|
|
break;
|
|
case CPU_DEAD:
|
|
case CPU_DEAD_FROZEN:
|
|
FCOE_DBG("CPU %x offline: Remove Rx thread\n", cpu);
|
|
fcoe_percpu_thread_destroy(cpu);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
/**
|
|
* fcoe_rcv() - Receive packets from a net device
|
|
* @skb: The received packet
|
|
* @netdev: The net device that the packet was received on
|
|
* @ptype: The packet type context
|
|
* @olddev: The last device net device
|
|
*
|
|
* This routine is called by NET_RX_SOFTIRQ. It receives a packet, builds a
|
|
* FC frame and passes the frame to libfc.
|
|
*
|
|
* Returns: 0 for success
|
|
*/
|
|
int fcoe_rcv(struct sk_buff *skb, struct net_device *netdev,
|
|
struct packet_type *ptype, struct net_device *olddev)
|
|
{
|
|
struct fc_lport *lport;
|
|
struct fcoe_rcv_info *fr;
|
|
struct fcoe_interface *fcoe;
|
|
struct fc_frame_header *fh;
|
|
struct fcoe_percpu_s *fps;
|
|
struct fcoe_port *port;
|
|
struct ethhdr *eh;
|
|
unsigned int cpu;
|
|
|
|
fcoe = container_of(ptype, struct fcoe_interface, fcoe_packet_type);
|
|
lport = fcoe->ctlr.lp;
|
|
if (unlikely(!lport)) {
|
|
FCOE_NETDEV_DBG(netdev, "Cannot find hba structure");
|
|
goto err2;
|
|
}
|
|
if (!lport->link_up)
|
|
goto err2;
|
|
|
|
FCOE_NETDEV_DBG(netdev, "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>");
|
|
|
|
/* check for mac addresses */
|
|
eh = eth_hdr(skb);
|
|
port = lport_priv(lport);
|
|
if (compare_ether_addr(eh->h_dest, port->data_src_addr) &&
|
|
compare_ether_addr(eh->h_dest, fcoe->ctlr.ctl_src_addr) &&
|
|
compare_ether_addr(eh->h_dest, (u8[6])FC_FCOE_FLOGI_MAC)) {
|
|
FCOE_NETDEV_DBG(netdev, "wrong destination mac address:%pM\n",
|
|
eh->h_dest);
|
|
goto err;
|
|
}
|
|
|
|
if (is_fip_mode(&fcoe->ctlr) &&
|
|
compare_ether_addr(eh->h_source, fcoe->ctlr.dest_addr)) {
|
|
FCOE_NETDEV_DBG(netdev, "wrong source mac address:%pM\n",
|
|
eh->h_source);
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* Check for minimum frame length, and make sure required FCoE
|
|
* and FC headers are pulled into the linear data area.
|
|
*/
|
|
if (unlikely((skb->len < FCOE_MIN_FRAME) ||
|
|
!pskb_may_pull(skb, FCOE_HEADER_LEN)))
|
|
goto err;
|
|
|
|
skb_set_transport_header(skb, sizeof(struct fcoe_hdr));
|
|
fh = (struct fc_frame_header *) skb_transport_header(skb);
|
|
|
|
fr = fcoe_dev_from_skb(skb);
|
|
fr->fr_dev = lport;
|
|
fr->ptype = ptype;
|
|
|
|
/*
|
|
* In case the incoming frame's exchange is originated from
|
|
* the initiator, then received frame's exchange id is ANDed
|
|
* with fc_cpu_mask bits to get the same cpu on which exchange
|
|
* was originated, otherwise just use the current cpu.
|
|
*/
|
|
if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX)
|
|
cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask;
|
|
else
|
|
cpu = smp_processor_id();
|
|
|
|
fps = &per_cpu(fcoe_percpu, cpu);
|
|
spin_lock_bh(&fps->fcoe_rx_list.lock);
|
|
if (unlikely(!fps->thread)) {
|
|
/*
|
|
* The targeted CPU is not ready, let's target
|
|
* the first CPU now. For non-SMP systems this
|
|
* will check the same CPU twice.
|
|
*/
|
|
FCOE_NETDEV_DBG(netdev, "CPU is online, but no receive thread "
|
|
"ready for incoming skb- using first online "
|
|
"CPU.\n");
|
|
|
|
spin_unlock_bh(&fps->fcoe_rx_list.lock);
|
|
cpu = cpumask_first(cpu_online_mask);
|
|
fps = &per_cpu(fcoe_percpu, cpu);
|
|
spin_lock_bh(&fps->fcoe_rx_list.lock);
|
|
if (!fps->thread) {
|
|
spin_unlock_bh(&fps->fcoe_rx_list.lock);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We now have a valid CPU that we're targeting for
|
|
* this skb. We also have this receive thread locked,
|
|
* so we're free to queue skbs into it's queue.
|
|
*/
|
|
|
|
/* If this is a SCSI-FCP frame, and this is already executing on the
|
|
* correct CPU, and the queue for this CPU is empty, then go ahead
|
|
* and process the frame directly in the softirq context.
|
|
* This lets us process completions without context switching from the
|
|
* NET_RX softirq, to our receive processing thread, and then back to
|
|
* BLOCK softirq context.
|
|
*/
|
|
if (fh->fh_type == FC_TYPE_FCP &&
|
|
cpu == smp_processor_id() &&
|
|
skb_queue_empty(&fps->fcoe_rx_list)) {
|
|
spin_unlock_bh(&fps->fcoe_rx_list.lock);
|
|
fcoe_recv_frame(skb);
|
|
} else {
|
|
__skb_queue_tail(&fps->fcoe_rx_list, skb);
|
|
if (fps->fcoe_rx_list.qlen == 1)
|
|
wake_up_process(fps->thread);
|
|
spin_unlock_bh(&fps->fcoe_rx_list.lock);
|
|
}
|
|
|
|
return 0;
|
|
err:
|
|
per_cpu_ptr(lport->dev_stats, get_cpu())->ErrorFrames++;
|
|
put_cpu();
|
|
err2:
|
|
kfree_skb(skb);
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
static inline int fcoe_start_io(struct sk_buff *skb)
|
|
{
|
|
struct sk_buff *nskb;
|
|
int rc;
|
|
|
|
nskb = skb_clone(skb, GFP_ATOMIC);
|
|
rc = dev_queue_xmit(nskb);
|
|
if (rc != 0)
|
|
return rc;
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*
|
|
* 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
|
|
*/
|
|
static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen)
|
|
{
|
|
struct fcoe_percpu_s *fps;
|
|
struct page *page;
|
|
|
|
fps = &get_cpu_var(fcoe_percpu);
|
|
page = fps->crc_eof_page;
|
|
if (!page) {
|
|
page = alloc_page(GFP_ATOMIC);
|
|
if (!page) {
|
|
put_cpu_var(fcoe_percpu);
|
|
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);
|
|
}
|
|
put_cpu_var(fcoe_percpu);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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 = frag->size;
|
|
while (len > 0) {
|
|
clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK));
|
|
data = kmap_atomic(frag->page + (off >> PAGE_SHIFT),
|
|
KM_SKB_DATA_SOFTIRQ);
|
|
crc = crc32(crc, data + (off & ~PAGE_MASK), clen);
|
|
kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ);
|
|
off += clen;
|
|
len -= clen;
|
|
}
|
|
}
|
|
return crc;
|
|
}
|
|
|
|
/**
|
|
* fcoe_xmit() - Transmit a FCoE frame
|
|
* @lport: The local port that the frame is to be transmitted for
|
|
* @fp: The frame to be transmitted
|
|
*
|
|
* Return: 0 for success
|
|
*/
|
|
int fcoe_xmit(struct fc_lport *lport, struct fc_frame *fp)
|
|
{
|
|
int wlen;
|
|
u32 crc;
|
|
struct ethhdr *eh;
|
|
struct fcoe_crc_eof *cp;
|
|
struct sk_buff *skb;
|
|
struct fcoe_dev_stats *stats;
|
|
struct fc_frame_header *fh;
|
|
unsigned int hlen; /* header length implies the version */
|
|
unsigned int tlen; /* trailer length */
|
|
unsigned int elen; /* eth header, may include vlan */
|
|
struct fcoe_port *port = lport_priv(lport);
|
|
struct fcoe_interface *fcoe = port->fcoe;
|
|
u8 sof, eof;
|
|
struct fcoe_hdr *hp;
|
|
|
|
WARN_ON((fr_len(fp) % sizeof(u32)) != 0);
|
|
|
|
fh = fc_frame_header_get(fp);
|
|
skb = fp_skb(fp);
|
|
wlen = skb->len / FCOE_WORD_TO_BYTE;
|
|
|
|
if (!lport->link_up) {
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
if (unlikely(fh->fh_type == FC_TYPE_ELS) &&
|
|
fcoe_ctlr_els_send(&fcoe->ctlr, lport, skb))
|
|
return 0;
|
|
|
|
sof = fr_sof(fp);
|
|
eof = fr_eof(fp);
|
|
|
|
elen = sizeof(struct ethhdr);
|
|
hlen = sizeof(struct fcoe_hdr);
|
|
tlen = sizeof(struct fcoe_crc_eof);
|
|
wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE;
|
|
|
|
/* crc offload */
|
|
if (likely(lport->crc_offload)) {
|
|
skb->ip_summed = CHECKSUM_PARTIAL;
|
|
skb->csum_start = skb_headroom(skb);
|
|
skb->csum_offset = skb->len;
|
|
crc = 0;
|
|
} else {
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
crc = fcoe_fc_crc(fp);
|
|
}
|
|
|
|
/* copy port crc and eof to the skb buff */
|
|
if (skb_is_nonlinear(skb)) {
|
|
skb_frag_t *frag;
|
|
if (fcoe_get_paged_crc_eof(skb, tlen)) {
|
|
kfree_skb(skb);
|
|
return -ENOMEM;
|
|
}
|
|
frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
|
|
cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ)
|
|
+ frag->page_offset;
|
|
} else {
|
|
cp = (struct fcoe_crc_eof *)skb_put(skb, tlen);
|
|
}
|
|
|
|
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 network/transport offsets to match mac/fcoe/port */
|
|
skb_push(skb, elen + hlen);
|
|
skb_reset_mac_header(skb);
|
|
skb_reset_network_header(skb);
|
|
skb->mac_len = elen;
|
|
skb->protocol = htons(ETH_P_FCOE);
|
|
skb->dev = fcoe->netdev;
|
|
|
|
/* fill up mac and fcoe headers */
|
|
eh = eth_hdr(skb);
|
|
eh->h_proto = htons(ETH_P_FCOE);
|
|
memcpy(eh->h_dest, fcoe->ctlr.dest_addr, ETH_ALEN);
|
|
if (fcoe->ctlr.map_dest)
|
|
memcpy(eh->h_dest + 3, fh->fh_d_id, 3);
|
|
|
|
if (unlikely(fcoe->ctlr.flogi_oxid != FC_XID_UNKNOWN))
|
|
memcpy(eh->h_source, fcoe->ctlr.ctl_src_addr, ETH_ALEN);
|
|
else
|
|
memcpy(eh->h_source, port->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;
|
|
|
|
/* fcoe lso, mss is in max_payload which is non-zero for FCP data */
|
|
if (lport->seq_offload && fr_max_payload(fp)) {
|
|
skb_shinfo(skb)->gso_type = SKB_GSO_FCOE;
|
|
skb_shinfo(skb)->gso_size = fr_max_payload(fp);
|
|
} else {
|
|
skb_shinfo(skb)->gso_type = 0;
|
|
skb_shinfo(skb)->gso_size = 0;
|
|
}
|
|
/* update tx stats: regardless if LLD fails */
|
|
stats = per_cpu_ptr(lport->dev_stats, get_cpu());
|
|
stats->TxFrames++;
|
|
stats->TxWords += wlen;
|
|
put_cpu();
|
|
|
|
/* send down to lld */
|
|
fr_dev(fp) = lport;
|
|
if (port->fcoe_pending_queue.qlen)
|
|
fcoe_check_wait_queue(lport, skb);
|
|
else if (fcoe_start_io(skb))
|
|
fcoe_check_wait_queue(lport, skb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fcoe_percpu_flush_done() - Indicate per-CPU queue flush completion
|
|
* @skb: The completed skb (argument required by destructor)
|
|
*/
|
|
static void fcoe_percpu_flush_done(struct sk_buff *skb)
|
|
{
|
|
complete(&fcoe_flush_completion);
|
|
}
|
|
|
|
/**
|
|
* fcoe_recv_frame() - process a single received frame
|
|
* @skb: frame to process
|
|
*/
|
|
static void fcoe_recv_frame(struct sk_buff *skb)
|
|
{
|
|
u32 fr_len;
|
|
struct fc_lport *lport;
|
|
struct fcoe_rcv_info *fr;
|
|
struct fcoe_dev_stats *stats;
|
|
struct fc_frame_header *fh;
|
|
struct fcoe_crc_eof crc_eof;
|
|
struct fc_frame *fp;
|
|
struct fcoe_port *port;
|
|
struct fcoe_hdr *hp;
|
|
|
|
fr = fcoe_dev_from_skb(skb);
|
|
lport = fr->fr_dev;
|
|
if (unlikely(!lport)) {
|
|
if (skb->destructor != fcoe_percpu_flush_done)
|
|
FCOE_NETDEV_DBG(skb->dev, "NULL lport in skb");
|
|
kfree_skb(skb);
|
|
return;
|
|
}
|
|
|
|
FCOE_NETDEV_DBG(skb->dev, "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>");
|
|
|
|
port = lport_priv(lport);
|
|
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);
|
|
|
|
stats = per_cpu_ptr(lport->dev_stats, get_cpu());
|
|
if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
|
|
if (stats->ErrorFrames < 5)
|
|
printk(KERN_WARNING "fcoe: FCoE version "
|
|
"mismatch: The frame has "
|
|
"version %x, but the "
|
|
"initiator supports version "
|
|
"%x\n", FC_FCOE_DECAPS_VER(hp),
|
|
FC_FCOE_VER);
|
|
goto drop;
|
|
}
|
|
|
|
skb_pull(skb, sizeof(struct fcoe_hdr));
|
|
fr_len = skb->len - sizeof(struct fcoe_crc_eof);
|
|
|
|
stats->RxFrames++;
|
|
stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;
|
|
|
|
fp = (struct fc_frame *)skb;
|
|
fc_frame_init(fp);
|
|
fr_dev(fp) = lport;
|
|
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)))
|
|
goto drop;
|
|
fr_eof(fp) = crc_eof.fcoe_eof;
|
|
fr_crc(fp) = crc_eof.fcoe_crc32;
|
|
if (pskb_trim(skb, fr_len))
|
|
goto drop;
|
|
|
|
/*
|
|
* 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 (lport->crc_offload &&
|
|
skb->ip_summed == CHECKSUM_UNNECESSARY)
|
|
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) &&
|
|
(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) {
|
|
if (le32_to_cpu(fr_crc(fp)) !=
|
|
~crc32(~0, skb->data, fr_len)) {
|
|
if (stats->InvalidCRCCount < 5)
|
|
printk(KERN_WARNING "fcoe: dropping "
|
|
"frame with CRC error\n");
|
|
stats->InvalidCRCCount++;
|
|
goto drop;
|
|
}
|
|
fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
|
|
}
|
|
put_cpu();
|
|
fc_exch_recv(lport, fp);
|
|
return;
|
|
|
|
drop:
|
|
stats->ErrorFrames++;
|
|
put_cpu();
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
/**
|
|
* fcoe_percpu_receive_thread() - The per-CPU packet receive thread
|
|
* @arg: The per-CPU context
|
|
*
|
|
* Return: 0 for success
|
|
*/
|
|
int fcoe_percpu_receive_thread(void *arg)
|
|
{
|
|
struct fcoe_percpu_s *p = arg;
|
|
struct sk_buff *skb;
|
|
|
|
set_user_nice(current, -20);
|
|
|
|
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);
|
|
fcoe_recv_frame(skb);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
static 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 < FCOE_LOW_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 > FCOE_MAX_QUEUE_DEPTH)
|
|
lport->qfull = 1;
|
|
spin_unlock_bh(&port->fcoe_pending_queue.lock);
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* fcoe_dev_setup() - Setup the link change notification interface
|
|
*/
|
|
static void fcoe_dev_setup(void)
|
|
{
|
|
register_netdevice_notifier(&fcoe_notifier);
|
|
}
|
|
|
|
/**
|
|
* fcoe_dev_cleanup() - Cleanup the link change notification interface
|
|
*/
|
|
static void fcoe_dev_cleanup(void)
|
|
{
|
|
unregister_netdevice_notifier(&fcoe_notifier);
|
|
}
|
|
|
|
/**
|
|
* fcoe_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 fcoe_device_notification(struct notifier_block *notifier,
|
|
ulong event, void *ptr)
|
|
{
|
|
struct fc_lport *lport = NULL;
|
|
struct net_device *netdev = ptr;
|
|
struct fcoe_interface *fcoe;
|
|
struct fcoe_port *port;
|
|
struct fcoe_dev_stats *stats;
|
|
u32 link_possible = 1;
|
|
u32 mfs;
|
|
int rc = NOTIFY_OK;
|
|
|
|
list_for_each_entry(fcoe, &fcoe_hostlist, list) {
|
|
if (fcoe->netdev == netdev) {
|
|
lport = fcoe->ctlr.lp;
|
|
break;
|
|
}
|
|
}
|
|
if (!lport) {
|
|
rc = NOTIFY_DONE;
|
|
goto out;
|
|
}
|
|
|
|
switch (event) {
|
|
case NETDEV_DOWN:
|
|
case NETDEV_GOING_DOWN:
|
|
link_possible = 0;
|
|
break;
|
|
case NETDEV_UP:
|
|
case NETDEV_CHANGE:
|
|
break;
|
|
case NETDEV_CHANGEMTU:
|
|
if (netdev->features & NETIF_F_FCOE_MTU)
|
|
break;
|
|
mfs = netdev->mtu - (sizeof(struct fcoe_hdr) +
|
|
sizeof(struct fcoe_crc_eof));
|
|
if (mfs >= FC_MIN_MAX_FRAME)
|
|
fc_set_mfs(lport, mfs);
|
|
break;
|
|
case NETDEV_REGISTER:
|
|
break;
|
|
case NETDEV_UNREGISTER:
|
|
list_del(&fcoe->list);
|
|
port = lport_priv(fcoe->ctlr.lp);
|
|
fcoe_interface_cleanup(fcoe);
|
|
schedule_work(&port->destroy_work);
|
|
goto out;
|
|
break;
|
|
case NETDEV_FEAT_CHANGE:
|
|
fcoe_netdev_features_change(lport, netdev);
|
|
break;
|
|
default:
|
|
FCOE_NETDEV_DBG(netdev, "Unknown event %ld "
|
|
"from netdev netlink\n", event);
|
|
}
|
|
|
|
fcoe_link_speed_update(lport);
|
|
|
|
if (link_possible && !fcoe_link_ok(lport))
|
|
fcoe_ctlr_link_up(&fcoe->ctlr);
|
|
else if (fcoe_ctlr_link_down(&fcoe->ctlr)) {
|
|
stats = per_cpu_ptr(lport->dev_stats, get_cpu());
|
|
stats->LinkFailureCount++;
|
|
put_cpu();
|
|
fcoe_clean_pending_queue(lport);
|
|
}
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
/**
|
|
* fcoe_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_disable(const char *buffer, struct kernel_param *kp)
|
|
{
|
|
struct fcoe_interface *fcoe;
|
|
struct net_device *netdev;
|
|
int rc = 0;
|
|
|
|
mutex_lock(&fcoe_config_mutex);
|
|
#ifdef CONFIG_FCOE_MODULE
|
|
/*
|
|
* Make sure the module has been initialized, and is not about to be
|
|
* removed. Module paramter sysfs files are writable before the
|
|
* module_init function is called and after module_exit.
|
|
*/
|
|
if (THIS_MODULE->state != MODULE_STATE_LIVE) {
|
|
rc = -ENODEV;
|
|
goto out_nodev;
|
|
}
|
|
#endif
|
|
|
|
netdev = fcoe_if_to_netdev(buffer);
|
|
if (!netdev) {
|
|
rc = -ENODEV;
|
|
goto out_nodev;
|
|
}
|
|
|
|
if (!rtnl_trylock()) {
|
|
dev_put(netdev);
|
|
mutex_unlock(&fcoe_config_mutex);
|
|
return restart_syscall();
|
|
}
|
|
|
|
fcoe = fcoe_hostlist_lookup_port(netdev);
|
|
rtnl_unlock();
|
|
|
|
if (fcoe) {
|
|
fcoe_ctlr_link_down(&fcoe->ctlr);
|
|
fcoe_clean_pending_queue(fcoe->ctlr.lp);
|
|
} else
|
|
rc = -ENODEV;
|
|
|
|
dev_put(netdev);
|
|
out_nodev:
|
|
mutex_unlock(&fcoe_config_mutex);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* fcoe_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_enable(const char *buffer, struct kernel_param *kp)
|
|
{
|
|
struct fcoe_interface *fcoe;
|
|
struct net_device *netdev;
|
|
int rc = 0;
|
|
|
|
mutex_lock(&fcoe_config_mutex);
|
|
#ifdef CONFIG_FCOE_MODULE
|
|
/*
|
|
* Make sure the module has been initialized, and is not about to be
|
|
* removed. Module paramter sysfs files are writable before the
|
|
* module_init function is called and after module_exit.
|
|
*/
|
|
if (THIS_MODULE->state != MODULE_STATE_LIVE) {
|
|
rc = -ENODEV;
|
|
goto out_nodev;
|
|
}
|
|
#endif
|
|
|
|
netdev = fcoe_if_to_netdev(buffer);
|
|
if (!netdev) {
|
|
rc = -ENODEV;
|
|
goto out_nodev;
|
|
}
|
|
|
|
if (!rtnl_trylock()) {
|
|
dev_put(netdev);
|
|
mutex_unlock(&fcoe_config_mutex);
|
|
return restart_syscall();
|
|
}
|
|
|
|
fcoe = fcoe_hostlist_lookup_port(netdev);
|
|
rtnl_unlock();
|
|
|
|
if (!fcoe)
|
|
rc = -ENODEV;
|
|
else if (!fcoe_link_ok(fcoe->ctlr.lp))
|
|
fcoe_ctlr_link_up(&fcoe->ctlr);
|
|
|
|
dev_put(netdev);
|
|
out_nodev:
|
|
mutex_unlock(&fcoe_config_mutex);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* fcoe_destroy() - Destroy a FCoE interface
|
|
* @buffer: The name of the Ethernet interface to be destroyed
|
|
* @kp: The associated kernel parameter
|
|
*
|
|
* Called from sysfs.
|
|
*
|
|
* Returns: 0 for success
|
|
*/
|
|
static int fcoe_destroy(const char *buffer, struct kernel_param *kp)
|
|
{
|
|
struct fcoe_interface *fcoe;
|
|
struct net_device *netdev;
|
|
int rc = 0;
|
|
|
|
mutex_lock(&fcoe_config_mutex);
|
|
#ifdef CONFIG_FCOE_MODULE
|
|
/*
|
|
* Make sure the module has been initialized, and is not about to be
|
|
* removed. Module paramter sysfs files are writable before the
|
|
* module_init function is called and after module_exit.
|
|
*/
|
|
if (THIS_MODULE->state != MODULE_STATE_LIVE) {
|
|
rc = -ENODEV;
|
|
goto out_nodev;
|
|
}
|
|
#endif
|
|
|
|
netdev = fcoe_if_to_netdev(buffer);
|
|
if (!netdev) {
|
|
rc = -ENODEV;
|
|
goto out_nodev;
|
|
}
|
|
|
|
if (!rtnl_trylock()) {
|
|
dev_put(netdev);
|
|
mutex_unlock(&fcoe_config_mutex);
|
|
return restart_syscall();
|
|
}
|
|
|
|
fcoe = fcoe_hostlist_lookup_port(netdev);
|
|
if (!fcoe) {
|
|
rtnl_unlock();
|
|
rc = -ENODEV;
|
|
goto out_putdev;
|
|
}
|
|
fcoe_interface_cleanup(fcoe);
|
|
list_del(&fcoe->list);
|
|
/* RTNL mutex is dropped by fcoe_if_destroy */
|
|
fcoe_if_destroy(fcoe->ctlr.lp);
|
|
|
|
out_putdev:
|
|
dev_put(netdev);
|
|
out_nodev:
|
|
mutex_unlock(&fcoe_config_mutex);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* fcoe_destroy_work() - Destroy a FCoE port in a deferred work context
|
|
* @work: Handle to the FCoE port to be destroyed
|
|
*/
|
|
static void fcoe_destroy_work(struct work_struct *work)
|
|
{
|
|
struct fcoe_port *port;
|
|
|
|
port = container_of(work, struct fcoe_port, destroy_work);
|
|
mutex_lock(&fcoe_config_mutex);
|
|
rtnl_lock();
|
|
/* RTNL mutex is dropped by fcoe_if_destroy */
|
|
fcoe_if_destroy(port->lport);
|
|
mutex_unlock(&fcoe_config_mutex);
|
|
}
|
|
|
|
/**
|
|
* fcoe_create() - Create a fcoe interface
|
|
* @buffer: The name of the Ethernet interface to create on
|
|
* @kp: The associated kernel param
|
|
*
|
|
* Called from sysfs.
|
|
*
|
|
* Returns: 0 for success
|
|
*/
|
|
static int fcoe_create(const char *buffer, struct kernel_param *kp)
|
|
{
|
|
enum fip_state fip_mode = (enum fip_state)(long)kp->arg;
|
|
int rc;
|
|
struct fcoe_interface *fcoe;
|
|
struct fc_lport *lport;
|
|
struct net_device *netdev;
|
|
|
|
mutex_lock(&fcoe_config_mutex);
|
|
|
|
if (!rtnl_trylock()) {
|
|
mutex_unlock(&fcoe_config_mutex);
|
|
return restart_syscall();
|
|
}
|
|
|
|
#ifdef CONFIG_FCOE_MODULE
|
|
/*
|
|
* Make sure the module has been initialized, and is not about to be
|
|
* removed. Module paramter sysfs files are writable before the
|
|
* module_init function is called and after module_exit.
|
|
*/
|
|
if (THIS_MODULE->state != MODULE_STATE_LIVE) {
|
|
rc = -ENODEV;
|
|
goto out_nomod;
|
|
}
|
|
#endif
|
|
|
|
if (!try_module_get(THIS_MODULE)) {
|
|
rc = -EINVAL;
|
|
goto out_nomod;
|
|
}
|
|
|
|
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 = fcoe_interface_create(netdev, fip_mode);
|
|
if (!fcoe) {
|
|
rc = -ENOMEM;
|
|
goto out_putdev;
|
|
}
|
|
|
|
lport = fcoe_if_create(fcoe, &netdev->dev, 0);
|
|
if (IS_ERR(lport)) {
|
|
printk(KERN_ERR "fcoe: Failed to create interface (%s)\n",
|
|
netdev->name);
|
|
rc = -EIO;
|
|
fcoe_interface_cleanup(fcoe);
|
|
goto out_free;
|
|
}
|
|
|
|
/* Make this the "master" N_Port */
|
|
fcoe->ctlr.lp = lport;
|
|
|
|
/* add to lports list */
|
|
fcoe_hostlist_add(lport);
|
|
|
|
/* start FIP Discovery and FLOGI */
|
|
lport->boot_time = jiffies;
|
|
fc_fabric_login(lport);
|
|
if (!fcoe_link_ok(lport))
|
|
fcoe_ctlr_link_up(&fcoe->ctlr);
|
|
|
|
/*
|
|
* Release from init in fcoe_interface_create(), on success lport
|
|
* should be holding a reference taken in fcoe_if_create().
|
|
*/
|
|
fcoe_interface_put(fcoe);
|
|
dev_put(netdev);
|
|
rtnl_unlock();
|
|
mutex_unlock(&fcoe_config_mutex);
|
|
|
|
return 0;
|
|
out_free:
|
|
fcoe_interface_put(fcoe);
|
|
out_putdev:
|
|
dev_put(netdev);
|
|
out_nodev:
|
|
module_put(THIS_MODULE);
|
|
out_nomod:
|
|
rtnl_unlock();
|
|
mutex_unlock(&fcoe_config_mutex);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* 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 fcoe_port *port = lport_priv(lport);
|
|
struct net_device *netdev = port->fcoe->netdev;
|
|
struct ethtool_cmd ecmd = { ETHTOOL_GSET };
|
|
|
|
if (!dev_ethtool_get_settings(netdev, &ecmd)) {
|
|
lport->link_supported_speeds &=
|
|
~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT);
|
|
if (ecmd.supported & (SUPPORTED_1000baseT_Half |
|
|
SUPPORTED_1000baseT_Full))
|
|
lport->link_supported_speeds |= FC_PORTSPEED_1GBIT;
|
|
if (ecmd.supported & SUPPORTED_10000baseT_Full)
|
|
lport->link_supported_speeds |=
|
|
FC_PORTSPEED_10GBIT;
|
|
if (ecmd.speed == SPEED_1000)
|
|
lport->link_speed = FC_PORTSPEED_1GBIT;
|
|
if (ecmd.speed == SPEED_10000)
|
|
lport->link_speed = FC_PORTSPEED_10GBIT;
|
|
|
|
return 0;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* fcoe_link_ok() - Check if the link is OK for a local port
|
|
* @lport: The local port to check link on
|
|
*
|
|
* Returns: 0 if link is UP and OK, -1 if not
|
|
*
|
|
*/
|
|
int fcoe_link_ok(struct fc_lport *lport)
|
|
{
|
|
struct fcoe_port *port = lport_priv(lport);
|
|
struct net_device *netdev = port->fcoe->netdev;
|
|
|
|
if (netif_oper_up(netdev))
|
|
return 0;
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* fcoe_percpu_clean() - Clear all pending skbs for an local port
|
|
* @lport: The local port whose skbs are to be cleared
|
|
*
|
|
* Must be called with fcoe_create_mutex held to single-thread completion.
|
|
*
|
|
* This flushes the pending skbs by adding a new skb to each queue and
|
|
* waiting until they are all freed. This assures us that not only are
|
|
* there no packets that will be handled by the lport, but also that any
|
|
* threads already handling packet have returned.
|
|
*/
|
|
void fcoe_percpu_clean(struct fc_lport *lport)
|
|
{
|
|
struct fcoe_percpu_s *pp;
|
|
struct fcoe_rcv_info *fr;
|
|
struct sk_buff_head *list;
|
|
struct sk_buff *skb, *next;
|
|
struct sk_buff *head;
|
|
unsigned int cpu;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
pp = &per_cpu(fcoe_percpu, cpu);
|
|
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 == lport) {
|
|
__skb_unlink(skb, list);
|
|
kfree_skb(skb);
|
|
}
|
|
}
|
|
|
|
if (!pp->thread || !cpu_online(cpu)) {
|
|
spin_unlock_bh(&pp->fcoe_rx_list.lock);
|
|
continue;
|
|
}
|
|
|
|
skb = dev_alloc_skb(0);
|
|
if (!skb) {
|
|
spin_unlock_bh(&pp->fcoe_rx_list.lock);
|
|
continue;
|
|
}
|
|
skb->destructor = fcoe_percpu_flush_done;
|
|
|
|
__skb_queue_tail(&pp->fcoe_rx_list, skb);
|
|
if (pp->fcoe_rx_list.qlen == 1)
|
|
wake_up_process(pp->thread);
|
|
spin_unlock_bh(&pp->fcoe_rx_list.lock);
|
|
|
|
wait_for_completion(&fcoe_flush_completion);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
/**
|
|
* fcoe_reset() - Reset a local port
|
|
* @shost: The SCSI host associated with the local port to be reset
|
|
*
|
|
* Returns: Always 0 (return value required by FC transport template)
|
|
*/
|
|
int fcoe_reset(struct Scsi_Host *shost)
|
|
{
|
|
struct fc_lport *lport = shost_priv(shost);
|
|
fc_lport_reset(lport);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fcoe_hostlist_lookup_port() - Find the FCoE interface associated with a net device
|
|
* @netdev: The net device used as a key
|
|
*
|
|
* Locking: Must be called with the RNL mutex held.
|
|
*
|
|
* Returns: NULL or the FCoE interface
|
|
*/
|
|
static struct fcoe_interface *
|
|
fcoe_hostlist_lookup_port(const struct net_device *netdev)
|
|
{
|
|
struct fcoe_interface *fcoe;
|
|
|
|
list_for_each_entry(fcoe, &fcoe_hostlist, list) {
|
|
if (fcoe->netdev == netdev)
|
|
return fcoe;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* fcoe_hostlist_lookup() - Find the local port associated with a
|
|
* given net device
|
|
* @netdev: The netdevice used as a key
|
|
*
|
|
* Locking: Must be called with the RTNL mutex held
|
|
*
|
|
* Returns: NULL or the local port
|
|
*/
|
|
static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
|
|
{
|
|
struct fcoe_interface *fcoe;
|
|
|
|
fcoe = fcoe_hostlist_lookup_port(netdev);
|
|
return (fcoe) ? fcoe->ctlr.lp : NULL;
|
|
}
|
|
|
|
/**
|
|
* fcoe_hostlist_add() - Add the FCoE interface identified by a local
|
|
* port to the hostlist
|
|
* @lport: The local port that identifies the FCoE interface to be added
|
|
*
|
|
* Locking: must be called with the RTNL mutex held
|
|
*
|
|
* Returns: 0 for success
|
|
*/
|
|
static int fcoe_hostlist_add(const struct fc_lport *lport)
|
|
{
|
|
struct fcoe_interface *fcoe;
|
|
struct fcoe_port *port;
|
|
|
|
fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport));
|
|
if (!fcoe) {
|
|
port = lport_priv(lport);
|
|
fcoe = port->fcoe;
|
|
list_add_tail(&fcoe->list, &fcoe_hostlist);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fcoe_init() - Initialize fcoe.ko
|
|
*
|
|
* Returns: 0 on success, or a negative value on failure
|
|
*/
|
|
static int __init fcoe_init(void)
|
|
{
|
|
struct fcoe_percpu_s *p;
|
|
unsigned int cpu;
|
|
int rc = 0;
|
|
|
|
mutex_lock(&fcoe_config_mutex);
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
p = &per_cpu(fcoe_percpu, cpu);
|
|
skb_queue_head_init(&p->fcoe_rx_list);
|
|
}
|
|
|
|
for_each_online_cpu(cpu)
|
|
fcoe_percpu_thread_create(cpu);
|
|
|
|
/* Initialize per CPU interrupt thread */
|
|
rc = register_hotcpu_notifier(&fcoe_cpu_notifier);
|
|
if (rc)
|
|
goto out_free;
|
|
|
|
/* Setup link change notification */
|
|
fcoe_dev_setup();
|
|
|
|
rc = fcoe_if_init();
|
|
if (rc)
|
|
goto out_free;
|
|
|
|
mutex_unlock(&fcoe_config_mutex);
|
|
return 0;
|
|
|
|
out_free:
|
|
for_each_online_cpu(cpu) {
|
|
fcoe_percpu_thread_destroy(cpu);
|
|
}
|
|
mutex_unlock(&fcoe_config_mutex);
|
|
return rc;
|
|
}
|
|
module_init(fcoe_init);
|
|
|
|
/**
|
|
* fcoe_exit() - Clean up fcoe.ko
|
|
*
|
|
* Returns: 0 on success or a negative value on failure
|
|
*/
|
|
static void __exit fcoe_exit(void)
|
|
{
|
|
struct fcoe_interface *fcoe, *tmp;
|
|
struct fcoe_port *port;
|
|
unsigned int cpu;
|
|
|
|
mutex_lock(&fcoe_config_mutex);
|
|
|
|
fcoe_dev_cleanup();
|
|
|
|
/* releases the associated fcoe hosts */
|
|
rtnl_lock();
|
|
list_for_each_entry_safe(fcoe, tmp, &fcoe_hostlist, list) {
|
|
list_del(&fcoe->list);
|
|
port = lport_priv(fcoe->ctlr.lp);
|
|
fcoe_interface_cleanup(fcoe);
|
|
schedule_work(&port->destroy_work);
|
|
}
|
|
rtnl_unlock();
|
|
|
|
unregister_hotcpu_notifier(&fcoe_cpu_notifier);
|
|
|
|
for_each_online_cpu(cpu)
|
|
fcoe_percpu_thread_destroy(cpu);
|
|
|
|
mutex_unlock(&fcoe_config_mutex);
|
|
|
|
/* flush any asyncronous interface destroys,
|
|
* this should happen after the netdev notifier is unregistered */
|
|
flush_scheduled_work();
|
|
/* That will flush out all the N_Ports on the hostlist, but now we
|
|
* may have NPIV VN_Ports scheduled for destruction */
|
|
flush_scheduled_work();
|
|
|
|
/* detach from scsi transport
|
|
* must happen after all destroys are done, therefor after the flush */
|
|
fcoe_if_exit();
|
|
}
|
|
module_exit(fcoe_exit);
|
|
|
|
/**
|
|
* fcoe_flogi_resp() - FCoE specific FLOGI and FDISC response handler
|
|
* @seq: active sequence in the FLOGI or FDISC exchange
|
|
* @fp: response frame, or error encoded in a pointer (timeout)
|
|
* @arg: pointer the the fcoe_ctlr structure
|
|
*
|
|
* This handles MAC address management for FCoE, then passes control on to
|
|
* the libfc FLOGI response handler.
|
|
*/
|
|
static void fcoe_flogi_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
|
|
{
|
|
struct fcoe_ctlr *fip = arg;
|
|
struct fc_exch *exch = fc_seq_exch(seq);
|
|
struct fc_lport *lport = exch->lp;
|
|
u8 *mac;
|
|
|
|
if (IS_ERR(fp))
|
|
goto done;
|
|
|
|
mac = fr_cb(fp)->granted_mac;
|
|
if (is_zero_ether_addr(mac)) {
|
|
/* pre-FIP */
|
|
if (fcoe_ctlr_recv_flogi(fip, lport, fp)) {
|
|
fc_frame_free(fp);
|
|
return;
|
|
}
|
|
}
|
|
fcoe_update_src_mac(lport, mac);
|
|
done:
|
|
fc_lport_flogi_resp(seq, fp, lport);
|
|
}
|
|
|
|
/**
|
|
* fcoe_logo_resp() - FCoE specific LOGO response handler
|
|
* @seq: active sequence in the LOGO exchange
|
|
* @fp: response frame, or error encoded in a pointer (timeout)
|
|
* @arg: pointer the the fcoe_ctlr structure
|
|
*
|
|
* This handles MAC address management for FCoE, then passes control on to
|
|
* the libfc LOGO response handler.
|
|
*/
|
|
static void fcoe_logo_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
|
|
{
|
|
struct fc_lport *lport = arg;
|
|
static u8 zero_mac[ETH_ALEN] = { 0 };
|
|
|
|
if (!IS_ERR(fp))
|
|
fcoe_update_src_mac(lport, zero_mac);
|
|
fc_lport_logo_resp(seq, fp, lport);
|
|
}
|
|
|
|
/**
|
|
* fcoe_elsct_send - FCoE specific ELS handler
|
|
*
|
|
* This does special case handling of FIP encapsualted ELS exchanges for FCoE,
|
|
* using FCoE specific response handlers and passing the FIP controller as
|
|
* the argument (the lport is still available from the exchange).
|
|
*
|
|
* Most of the work here is just handed off to the libfc routine.
|
|
*/
|
|
static struct fc_seq *fcoe_elsct_send(struct fc_lport *lport, u32 did,
|
|
struct fc_frame *fp, unsigned int op,
|
|
void (*resp)(struct fc_seq *,
|
|
struct fc_frame *,
|
|
void *),
|
|
void *arg, u32 timeout)
|
|
{
|
|
struct fcoe_port *port = lport_priv(lport);
|
|
struct fcoe_interface *fcoe = port->fcoe;
|
|
struct fcoe_ctlr *fip = &fcoe->ctlr;
|
|
struct fc_frame_header *fh = fc_frame_header_get(fp);
|
|
|
|
switch (op) {
|
|
case ELS_FLOGI:
|
|
case ELS_FDISC:
|
|
if (lport->point_to_multipoint)
|
|
break;
|
|
return fc_elsct_send(lport, did, fp, op, fcoe_flogi_resp,
|
|
fip, timeout);
|
|
case ELS_LOGO:
|
|
/* only hook onto fabric logouts, not port logouts */
|
|
if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
|
|
break;
|
|
return fc_elsct_send(lport, did, fp, op, fcoe_logo_resp,
|
|
lport, timeout);
|
|
}
|
|
return fc_elsct_send(lport, did, fp, op, resp, arg, timeout);
|
|
}
|
|
|
|
/**
|
|
* fcoe_vport_create() - create an fc_host/scsi_host for a vport
|
|
* @vport: fc_vport object to create a new fc_host for
|
|
* @disabled: start the new fc_host in a disabled state by default?
|
|
*
|
|
* Returns: 0 for success
|
|
*/
|
|
static int fcoe_vport_create(struct fc_vport *vport, bool disabled)
|
|
{
|
|
struct Scsi_Host *shost = vport_to_shost(vport);
|
|
struct fc_lport *n_port = shost_priv(shost);
|
|
struct fcoe_port *port = lport_priv(n_port);
|
|
struct fcoe_interface *fcoe = port->fcoe;
|
|
struct net_device *netdev = fcoe->netdev;
|
|
struct fc_lport *vn_port;
|
|
|
|
mutex_lock(&fcoe_config_mutex);
|
|
vn_port = fcoe_if_create(fcoe, &vport->dev, 1);
|
|
mutex_unlock(&fcoe_config_mutex);
|
|
|
|
if (IS_ERR(vn_port)) {
|
|
printk(KERN_ERR "fcoe: fcoe_vport_create(%s) failed\n",
|
|
netdev->name);
|
|
return -EIO;
|
|
}
|
|
|
|
if (disabled) {
|
|
fc_vport_set_state(vport, FC_VPORT_DISABLED);
|
|
} else {
|
|
vn_port->boot_time = jiffies;
|
|
fc_fabric_login(vn_port);
|
|
fc_vport_setlink(vn_port);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fcoe_vport_destroy() - destroy the fc_host/scsi_host for a vport
|
|
* @vport: fc_vport object that is being destroyed
|
|
*
|
|
* Returns: 0 for success
|
|
*/
|
|
static int fcoe_vport_destroy(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 = vport->dd_data;
|
|
struct fcoe_port *port = lport_priv(vn_port);
|
|
|
|
mutex_lock(&n_port->lp_mutex);
|
|
list_del(&vn_port->list);
|
|
mutex_unlock(&n_port->lp_mutex);
|
|
schedule_work(&port->destroy_work);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fcoe_vport_disable() - change vport state
|
|
* @vport: vport to bring online/offline
|
|
* @disable: should the vport be disabled?
|
|
*/
|
|
static int fcoe_vport_disable(struct fc_vport *vport, bool disable)
|
|
{
|
|
struct fc_lport *lport = vport->dd_data;
|
|
|
|
if (disable) {
|
|
fc_vport_set_state(vport, FC_VPORT_DISABLED);
|
|
fc_fabric_logoff(lport);
|
|
} else {
|
|
lport->boot_time = jiffies;
|
|
fc_fabric_login(lport);
|
|
fc_vport_setlink(lport);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fcoe_vport_set_symbolic_name() - append vport string to symbolic name
|
|
* @vport: fc_vport with a new symbolic name string
|
|
*
|
|
* After generating a new symbolic name string, a new RSPN_ID request is
|
|
* sent to the name server. There is no response handler, so if it fails
|
|
* for some reason it will not be retried.
|
|
*/
|
|
static void fcoe_set_vport_symbolic_name(struct fc_vport *vport)
|
|
{
|
|
struct fc_lport *lport = vport->dd_data;
|
|
struct fc_frame *fp;
|
|
size_t len;
|
|
|
|
snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE,
|
|
"%s v%s over %s : %s", FCOE_NAME, FCOE_VERSION,
|
|
fcoe_netdev(lport)->name, vport->symbolic_name);
|
|
|
|
if (lport->state != LPORT_ST_READY)
|
|
return;
|
|
|
|
len = strnlen(fc_host_symbolic_name(lport->host), 255);
|
|
fp = fc_frame_alloc(lport,
|
|
sizeof(struct fc_ct_hdr) +
|
|
sizeof(struct fc_ns_rspn) + len);
|
|
if (!fp)
|
|
return;
|
|
lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RSPN_ID,
|
|
NULL, NULL, 3 * lport->r_a_tov);
|
|
}
|
|
|
|
/**
|
|
* fcoe_get_lesb() - Fill the FCoE Link Error Status Block
|
|
* @lport: the local port
|
|
* @fc_lesb: the link error status block
|
|
*/
|
|
static void fcoe_get_lesb(struct fc_lport *lport,
|
|
struct fc_els_lesb *fc_lesb)
|
|
{
|
|
unsigned int cpu;
|
|
u32 lfc, vlfc, mdac;
|
|
struct fcoe_dev_stats *devst;
|
|
struct fcoe_fc_els_lesb *lesb;
|
|
struct rtnl_link_stats64 temp;
|
|
struct net_device *netdev = fcoe_netdev(lport);
|
|
|
|
lfc = 0;
|
|
vlfc = 0;
|
|
mdac = 0;
|
|
lesb = (struct fcoe_fc_els_lesb *)fc_lesb;
|
|
memset(lesb, 0, sizeof(*lesb));
|
|
for_each_possible_cpu(cpu) {
|
|
devst = per_cpu_ptr(lport->dev_stats, cpu);
|
|
lfc += devst->LinkFailureCount;
|
|
vlfc += devst->VLinkFailureCount;
|
|
mdac += devst->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);
|
|
}
|
|
|
|
/**
|
|
* fcoe_set_port_id() - Callback from libfc when Port_ID is set.
|
|
* @lport: the local port
|
|
* @port_id: the port ID
|
|
* @fp: the received frame, if any, that caused the port_id to be set.
|
|
*
|
|
* This routine handles the case where we received a FLOGI and are
|
|
* entering point-to-point mode. We need to call fcoe_ctlr_recv_flogi()
|
|
* so it can set the non-mapped mode and gateway address.
|
|
*
|
|
* The FLOGI LS_ACC is handled by fcoe_flogi_resp().
|
|
*/
|
|
static void fcoe_set_port_id(struct fc_lport *lport,
|
|
u32 port_id, struct fc_frame *fp)
|
|
{
|
|
struct fcoe_port *port = lport_priv(lport);
|
|
struct fcoe_interface *fcoe = port->fcoe;
|
|
|
|
if (fp && fc_frame_payload_op(fp) == ELS_FLOGI)
|
|
fcoe_ctlr_recv_flogi(&fcoe->ctlr, lport, fp);
|
|
}
|