litmus-rt.git - The LITMUS^RT kernel.

	Commit message (Expand)	Author	Age
*	arcnet endianness annotations	Al Viro	2007-10-10
*	IRQ: Maintain regs pointer globally rather than passing to IRQ handlers	David Howells	2006-10-05
*	[PATCH] drivers/net/arcnet/: possible cleanups	Adrian Bunk	2006-01-17
*	Linux-2.6.12-rc2v2.6.12-rc2	Linus Torvalds	2005-04-16

/* * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. * * Maintained at www.Open-FCoE.org */ #include <linux/module.h> #include <linux/version.h> #include <linux/spinlock.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/ethtool.h> #include <linux/if_ether.h> #include <linux/if_vlan.h> #include <linux/crc32.h> #include <linux/cpu.h> #include <linux/fs.h> #include <linux/sysfs.h> #include <linux/ctype.h> #include <scsi/scsi_tcq.h> #include <scsi/scsicam.h> #include <scsi/scsi_transport.h> #include <scsi/scsi_transport_fc.h> #include <net/rtnetlink.h> #include <scsi/fc/fc_encaps.h> #include <scsi/fc/fc_fip.h> #include <scsi/libfc.h> #include <scsi/fc_frame.h> #include <scsi/libfcoe.h> #include "fcoe.h" MODULE_AUTHOR("Open-FCoE.org"); MODULE_DESCRIPTION("FCoE"); MODULE_LICENSE("GPL v2"); /* Performance tuning parameters for fcoe */ static unsigned int fcoe_ddp_min; module_param_named(ddp_min, fcoe_ddp_min, uint, S_IRUGO | S_IWUSR); MODULE_PARM_DESC(ddp_min, "Minimum I/O size in bytes for " \ "Direct Data Placement (DDP)."); DEFINE_MUTEX(fcoe_config_mutex); /* fcoe_percpu_clean completion. Waiter protected by fcoe_create_mutex */ static DECLARE_COMPLETION(fcoe_flush_completion); /* fcoe host list */ /* must only by accessed under the RTNL mutex */ LIST_HEAD(fcoe_hostlist); DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu); /* Function Prototypes */ static int fcoe_reset(struct Scsi_Host *); static int fcoe_xmit(struct fc_lport *, struct fc_frame *); static int fcoe_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *); static int fcoe_percpu_receive_thread(void *); static void fcoe_clean_pending_queue(struct fc_lport *); static void fcoe_percpu_clean(struct fc_lport *); static int fcoe_link_ok(struct fc_lport *); static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *); static int fcoe_hostlist_add(const struct fc_lport *); static void fcoe_check_wait_queue(struct fc_lport *, struct sk_buff *); static int fcoe_device_notification(struct notifier_block *, ulong, void *); static void fcoe_dev_setup(void); static void fcoe_dev_cleanup(void); static struct fcoe_interface *fcoe_hostlist_lookup_port(const struct net_device *); static int fcoe_fip_recv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *); static void fcoe_fip_send(struct fcoe_ctlr *, struct sk_buff *); static void fcoe_update_src_mac(struct fc_lport *, u8 *); static u8 *fcoe_get_src_mac(struct fc_lport *); static void fcoe_destroy_work(struct work_struct *); static int fcoe_ddp_setup(struct fc_lport *, u16, struct scatterlist *, unsigned int); static int fcoe_ddp_done(struct fc_lport *, u16); static int fcoe_cpu_callback(struct notifier_block *, unsigned long, void *); static int fcoe_create(const char *, struct kernel_param *); static int fcoe_destroy(const char *, struct kernel_param *); static int fcoe_enable(const char *, struct kernel_param *); static int fcoe_disable(const char *, struct kernel_param *); static struct fc_seq *fcoe_elsct_send(struct fc_lport *, u32 did, struct fc_frame *, unsigned int op, void (*resp)(struct fc_seq *, struct fc_frame *, void *), void *, u32 timeout); static void fcoe_recv_frame(struct sk_buff *skb); static void fcoe_get_lesb(struct fc_lport *, struct fc_els_lesb *); module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR); __MODULE_PARM_TYPE(create, "string"); MODULE_PARM_DESC(create, " Creates fcoe instance on a ethernet interface"); module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR); __MODULE_PARM_TYPE(destroy, "string"); MODULE_PARM_DESC(destroy, " Destroys fcoe instance on a ethernet interface"); module_param_call(enable, fcoe_enable, NULL, NULL, S_IWUSR); __MODULE_PARM_TYPE(enable, "string"); MODULE_PARM_DESC(enable, " Enables fcoe on a ethernet interface."); module_param_call(disable, fcoe_disable, NULL, NULL, S_IWUSR); __MODULE_PARM_TYPE(disable, "string"); MODULE_PARM_DESC(disable, " Disables fcoe on a ethernet interface."); /* notification function for packets from net device */ static struct notifier_block fcoe_notifier = { .notifier_call = fcoe_device_notification, }; /* notification function for CPU hotplug events */ static struct notifier_block fcoe_cpu_notifier = { .notifier_call = fcoe_cpu_callback, }; static struct scsi_transport_template *fcoe_transport_template; static struct scsi_transport_template *fcoe_vport_transport_template; static int fcoe_vport_destroy(struct fc_vport *); static int fcoe_vport_create(struct fc_vport *, bool disabled); static int fcoe_vport_disable(struct fc_vport *, bool disable); static void fcoe_set_vport_symbolic_name(struct fc_vport *); static struct libfc_function_template fcoe_libfc_fcn_templ = { .frame_send = fcoe_xmit, .ddp_setup = fcoe_ddp_setup, .ddp_done = fcoe_ddp_done, .elsct_send = fcoe_elsct_send, .get_lesb = fcoe_get_lesb, }; struct fc_function_template fcoe_transport_function = { .show_host_node_name = 1, .show_host_port_name = 1, .show_host_supported_classes = 1, .show_host_supported_fc4s = 1, .show_host_active_fc4s = 1, .show_host_maxframe_size = 1, .show_host_port_id = 1, .show_host_supported_speeds = 1, .get_host_speed = fc_get_host_speed, .show_host_speed = 1, .show_host_port_type = 1, .get_host_port_state = fc_get_host_port_state, .show_host_port_state = 1, .show_host_symbolic_name = 1, .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv), .show_rport_maxframe_size = 1, .show_rport_supported_classes = 1, .show_host_fabric_name = 1, .show_starget_node_name = 1, .show_starget_port_name = 1, .show_starget_port_id = 1, .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo, .show_rport_dev_loss_tmo = 1, .get_fc_host_stats = fc_get_host_stats, .issue_fc_host_lip = fcoe_reset, .terminate_rport_io = fc_rport_terminate_io, .vport_create = fcoe_vport_create, .vport_delete = fcoe_vport_destroy, .vport_disable = fcoe_vport_disable, .set_vport_symbolic_name = fcoe_set_vport_symbolic_name, .bsg_request = fc_lport_bsg_request, }; struct fc_function_template fcoe_vport_transport_function = { .show_host_node_name = 1, .show_host_port_name = 1, .show_host_supported_classes = 1, .show_host_supported_fc4s = 1, .show_host_active_fc4s = 1, .show_host_maxframe_size = 1, .show_host_port_id = 1, .show_host_supported_speeds = 1, .get_host_speed = fc_get_host_speed, .show_host_speed = 1, .show_host_port_type = 1, .get_host_port_state = fc_get_host_port_state, .show_host_port_state = 1, .show_host_symbolic_name = 1, .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv), .show_rport_maxframe_size = 1, .show_rport_supported_classes = 1, .show_host_fabric_name = 1, .show_starget_node_name = 1, .show_starget_port_name = 1, .show_starget_port_id = 1, .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo, .show_rport_dev_loss_tmo = 1, .get_fc_host_stats = fc_get_host_stats, .issue_fc_host_lip = fcoe_reset, .terminate_rport_io = fc_rport_terminate_io, .bsg_request = fc_lport_bsg_request, }; static struct scsi_host_template fcoe_shost_template = { .module = THIS_MODULE, .name = "FCoE Driver", .proc_name = FCOE_NAME, .queuecommand = fc_queuecommand, .eh_abort_handler = fc_eh_abort, .eh_device_reset_handler = fc_eh_device_reset, .eh_host_reset_handler = fc_eh_host_reset, .slave_alloc = fc_slave_alloc, .change_queue_depth = fc_change_queue_depth, .change_queue_type = fc_change_queue_type, .this_id = -1, .cmd_per_lun = 3, .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS, .use_clustering = ENABLE_CLUSTERING, .sg_tablesize = SG_ALL, .max_sectors = 0xffff, }; /** * fcoe_interface_setup() - Setup a FCoE interface * @fcoe: The new FCoE interface * @netdev: The net device that the fcoe interface is on * * Returns : 0 for success * Locking: must be called with the RTNL mutex held */ static int fcoe_interface_setup(struct fcoe_interface *fcoe, struct net_device *netdev) { struct fcoe_ctlr *fip = &fcoe->ctlr; struct netdev_hw_addr *ha; struct net_device *real_dev; u8 flogi_maddr[ETH_ALEN]; const struct net_device_ops *ops; fcoe->netdev = netdev; /* Let LLD initialize for FCoE */ ops = netdev->netdev_ops; if (ops->ndo_fcoe_enable) { if (ops->ndo_fcoe_enable(netdev)) FCOE_NETDEV_DBG(netdev, "Failed to enable FCoE" " specific feature for LLD.\n"); } /* Do not support for bonding device */ if ((netdev->priv_flags & IFF_MASTER_ALB) || (netdev->priv_flags & IFF_SLAVE_INACTIVE) || (netdev->priv_flags & IFF_MASTER_8023AD)) { FCOE_NETDEV_DBG(netdev, "Bonded interfaces not supported\n"); return -EOPNOTSUPP; } /* look for SAN MAC address, if multiple SAN MACs exist, only * use the first one for SPMA */ real_dev = (netdev->priv_flags & IFF_802_1Q_VLAN) ? vlan_dev_real_dev(netdev) : netdev; rcu_read_lock(); for_each_dev_addr(real_dev, ha) { if ((ha->type == NETDEV_HW_ADDR_T_SAN) && (is_valid_ether_addr(ha->addr))) { memcpy(fip->ctl_src_addr, ha->addr, ETH_ALEN); fip->spma = 1; break; } } rcu_read_unlock(); /* setup Source Mac Address */ if (!fip->spma) memcpy(fip->ctl_src_addr, netdev->dev_addr, netdev->addr_len); /* * Add FCoE MAC address as second unicast MAC address * or enter promiscuous mode if not capable of listening * for multiple unicast MACs. */ memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); dev_uc_add(netdev, flogi_maddr); if (fip->spma) dev_uc_add(netdev, fip->ctl_src_addr); dev_mc_add(netdev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0); /* * setup the receive function from ethernet driver * on the ethertype for the given device */ fcoe->fcoe_packet_type.func = fcoe_rcv; fcoe->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE); fcoe->fcoe_packet_type.dev = netdev; dev_add_pack(&fcoe->fcoe_packet_type); fcoe->fip_packet_type.func = fcoe_fip_recv; fcoe->fip_packet_type.type = htons(ETH_P_FIP); fcoe->fip_packet_type.dev = netdev; dev_add_pack(&fcoe->fip_packet_type); return 0; } /** * fcoe_interface_create() - Create a FCoE interface on a net device * @netdev: The net device to create the FCoE interface on * * Returns: pointer to a struct fcoe_interface or NULL on error */ static struct fcoe_interface *fcoe_interface_create(struct net_device *netdev) { struct fcoe_interface *fcoe; int err; fcoe = kzalloc(sizeof(*fcoe), GFP_KERNEL); if (!fcoe) { FCOE_NETDEV_DBG(netdev, "Could not allocate fcoe structure\n"); return NULL; } dev_hold(netdev); kref_init(&fcoe->kref); /* * Initialize FIP. */ fcoe_ctlr_init(&fcoe->ctlr); fcoe->ctlr.send = fcoe_fip_send; fcoe->ctlr.update_mac = fcoe_update_src_mac; fcoe->ctlr.get_src_addr = fcoe_get_src_mac; err = fcoe_interface_setup(fcoe, netdev); if (err) { fcoe_ctlr_destroy(&fcoe->ctlr); kfree(fcoe); dev_put(netdev); return NULL; } return fcoe; } /** * fcoe_interface_cleanup() - Clean up a FCoE interface * @fcoe: The FCoE interface to be cleaned up * * Caller must be holding the RTNL mutex */ void fcoe_interface_cleanup(struct fcoe_interface *fcoe) { struct net_device *netdev = fcoe->netdev; struct fcoe_ctlr *fip = &fcoe->ctlr; u8 flogi_maddr[ETH_ALEN]; const struct net_device_ops *ops; /* * Don't listen for Ethernet packets anymore. * synchronize_net() ensures that the packet handlers are not running * on another CPU. dev_remove_pack() would do that, this calls the * unsyncronized version __dev_remove_pack() to avoid multiple delays. */ __dev_remove_pack(&fcoe->fcoe_packet_type); __dev_remove_pack(&fcoe->fip_packet_type); synchronize_net(); /* Delete secondary MAC addresses */ memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); dev_uc_del(netdev, flogi_maddr); if (fip->spma) dev_uc_del(netdev, fip->ctl_src_addr); dev_mc_delete(netdev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0); /* Tell the LLD we are done w/ FCoE */ ops = netdev->netdev_ops; if (ops->ndo_fcoe_disable) { if (ops->ndo_fcoe_disable(netdev)) FCOE_NETDEV_DBG(netdev, "Failed to disable FCoE" " specific feature for LLD.\n"); } } /** * fcoe_interface_release() - fcoe_port kref release function * @kref: Embedded reference count in an fcoe_interface struct */ static void fcoe_interface_release(struct kref *kref) { struct fcoe_interface *fcoe; struct net_device *netdev; 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_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; int vid = 0; /* 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 */ if (netdev->features & NETIF_F_SG) lport->sg_supp = 1; if (netdev->features & NETIF_F_FCOE_CRC) { lport->crc_offload = 1; FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n"); } 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); } 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); } skb_queue_head_init(&port->fcoe_pending_queue); port->fcoe_pending_queue_active = 0; setup_timer(&port->timer, fcoe_queue_timer, (unsigned long)lport); if (!lport->vport) { /* * Use NAA 1&2 (FC-FS Rev. 2.0, Sec. 15) to generate WWNN/WWPN: * For WWNN, we use NAA 1 w/ bit 27-16 of word 0 as 0. * For WWPN, we use NAA 2 w/ bit 27-16 of word 0 from VLAN ID */ if (netdev->priv_flags & IFF_802_1Q_VLAN) vid = vlan_dev_vlan_id(netdev); 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, vid); fc_set_wwpn(lport, wwpn); } return 0; } /** * fcoe_shost_config() - Set up the SCSI host associated with a local port * @lport: The local port * @shost: The SCSI host to associate with 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 Scsi_Host *shost, 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; 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) = USHORT_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 */ 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); rtnl_lock(); 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); } /** * 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; struct Scsi_Host *shost; 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; } shost = lport->host; 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, 0x%llX 0x%llX\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, shost, 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_libfc_fcn_templ); 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 = smp_processor_id(); #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); } #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; 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 FCOE packet type */ if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) { FCOE_NETDEV_DBG(netdev, "Wrong FC type frame"); 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: fc_lport_get_stats(lport)->ErrorFrames++; 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_r_ctl == FC_RCTL_ELS_REQ) && 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); if (fcoe->ctlr.map_dest) fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id); else /* insert GW address */ memcpy(eh->h_dest, fcoe->ctlr.dest_addr, ETH_ALEN); 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 = fc_lport_get_stats(lport); stats->TxFrames++; stats->TxWords += wlen; /* 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; u8 *mac = NULL; 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>"); /* * Save source MAC address before discarding header. */ port = lport_priv(lport); if (skb_is_nonlinear(skb)) skb_linearize(skb); /* not ideal */ mac = eth_hdr(skb)->h_source; /* * 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 = fc_lport_get_stats(lport); 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); stats->ErrorFrames++; kfree_skb(skb); return; } 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))) { kfree_skb(skb); return; } fr_eof(fp) = crc_eof.fcoe_eof; fr_crc(fp) = crc_eof.fcoe_crc32; if (pskb_trim(skb, fr_len)) { kfree_skb(skb); return; } /* * 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) { fc_exch_recv(lport, fp); return; } if (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++; stats->ErrorFrames++; fc_frame_free(fp); return; } fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; } fc_exch_recv(lport, fp); } /** * 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; default: FCOE_NETDEV_DBG(netdev, "Unknown event %ld " "from netdev netlink\n", event); } if (link_possible && !fcoe_link_ok(lport)) fcoe_ctlr_link_up(&fcoe->ctlr); else if (fcoe_ctlr_link_down(&fcoe->ctlr)) { stats = fc_lport_get_stats(lport); stats->LinkFailureCount++; 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; } rtnl_lock(); fcoe = fcoe_hostlist_lookup_port(netdev); rtnl_unlock(); if (fcoe) fc_fabric_logoff(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; } rtnl_lock(); fcoe = fcoe_hostlist_lookup_port(netdev); rtnl_unlock(); if (fcoe) rc = fc_fabric_login(fcoe->ctlr.lp); else rc = -ENODEV; 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; } rtnl_lock(); fcoe = fcoe_hostlist_lookup_port(netdev); if (!fcoe) { rtnl_unlock(); rc = -ENODEV; goto out_putdev; } list_del(&fcoe->list); fcoe_interface_cleanup(fcoe); rtnl_unlock(); fcoe_if_destroy(fcoe->ctlr.lp); module_put(THIS_MODULE); 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); 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) { int rc; struct fcoe_interface *fcoe; struct fc_lport *lport; struct net_device *netdev; 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 if (!try_module_get(THIS_MODULE)) { rc = -EINVAL; goto out_nomod; } rtnl_lock(); 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); 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: rtnl_unlock(); module_put(THIS_MODULE); out_nomod: mutex_unlock(&fcoe_config_mutex); return rc; } /** * fcoe_link_ok() - Check if the link is OK for a local port * @lport: The local port to check link on * * Any permanently-disqualifying conditions have been previously checked. * This also updates the speed setting, which may change with link for 100/1000. * * This function should probably be checking for PAUSE support at some point * in the future. Currently Per-priority-pause is not determinable using * ethtool, so we shouldn't be restrictive until that problem is resolved. * * Returns: 0 if link is OK for use by FCoE. * */ int fcoe_link_ok(struct fc_lport *lport) { struct fcoe_port *port = lport_priv(lport); struct net_device *netdev = port->fcoe->netdev; struct ethtool_cmd ecmd = { ETHTOOL_GSET }; if ((netdev->flags & IFF_UP) && netif_carrier_ok(netdev) && (!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_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 managment 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 managment 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: 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 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)->rx_crc_errors); }