| /* |
| * Copyright(c) 2007 - 2008 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" |
| |
| static int debug_fcoe; |
| |
| MODULE_AUTHOR("Open-FCoE.org"); |
| MODULE_DESCRIPTION("FCoE"); |
| MODULE_LICENSE("GPL v2"); |
| |
| /* fcoe host list */ |
| LIST_HEAD(fcoe_hostlist); |
| DEFINE_RWLOCK(fcoe_hostlist_lock); |
| DEFINE_TIMER(fcoe_timer, NULL, 0, 0); |
| DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu); |
| |
| /* Function Prototypes */ |
| static int fcoe_reset(struct Scsi_Host *shost); |
| 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 *arg); |
| static void fcoe_clean_pending_queue(struct fc_lport *lp); |
| static void fcoe_percpu_clean(struct fc_lport *lp); |
| static int fcoe_link_ok(struct fc_lport *lp); |
| |
| static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *); |
| static int fcoe_hostlist_add(const struct fc_lport *); |
| static int fcoe_hostlist_remove(const struct fc_lport *); |
| |
| static int fcoe_check_wait_queue(struct fc_lport *); |
| static int fcoe_device_notification(struct notifier_block *, ulong, void *); |
| static void fcoe_dev_setup(void); |
| static void fcoe_dev_cleanup(void); |
| |
| /* notification function from net device */ |
| static struct notifier_block fcoe_notifier = { |
| .notifier_call = fcoe_device_notification, |
| }; |
| |
| static struct scsi_transport_template *scsi_transport_fcoe_sw; |
| |
| 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, |
| }; |
| |
| 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 = 32, |
| .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS, |
| .use_clustering = ENABLE_CLUSTERING, |
| .sg_tablesize = SG_ALL, |
| .max_sectors = 0xffff, |
| }; |
| |
| /** |
| * fcoe_lport_config() - sets up the fc_lport |
| * @lp: ptr to the fc_lport |
| * |
| * Returns: 0 for success |
| */ |
| static int fcoe_lport_config(struct fc_lport *lp) |
| { |
| lp->link_up = 0; |
| lp->qfull = 0; |
| lp->max_retry_count = 3; |
| lp->max_rport_retry_count = 3; |
| lp->e_d_tov = 2 * 1000; /* FC-FS default */ |
| lp->r_a_tov = 2 * 2 * 1000; |
| lp->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS | |
| FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL); |
| |
| fc_lport_init_stats(lp); |
| |
| /* lport fc_lport related configuration */ |
| fc_lport_config(lp); |
| |
| /* offload related configuration */ |
| lp->crc_offload = 0; |
| lp->seq_offload = 0; |
| lp->lro_enabled = 0; |
| lp->lro_xid = 0; |
| lp->lso_max = 0; |
| |
| return 0; |
| } |
| |
| /** |
| * fcoe_netdev_config() - Set up netdev for SW FCoE |
| * @lp : ptr to the fc_lport |
| * @netdev : ptr to the associated netdevice struct |
| * |
| * Must be called after fcoe_lport_config() as it will use lport mutex |
| * |
| * Returns : 0 for success |
| */ |
| static int fcoe_netdev_config(struct fc_lport *lp, struct net_device *netdev) |
| { |
| u32 mfs; |
| u64 wwnn, wwpn; |
| struct fcoe_softc *fc; |
| u8 flogi_maddr[ETH_ALEN]; |
| |
| /* Setup lport private data to point to fcoe softc */ |
| fc = lport_priv(lp); |
| fc->ctlr.lp = lp; |
| fc->real_dev = netdev; |
| fc->phys_dev = netdev; |
| |
| /* Require support for get_pauseparam ethtool op. */ |
| if (netdev->priv_flags & IFF_802_1Q_VLAN) |
| fc->phys_dev = vlan_dev_real_dev(netdev); |
| |
| /* Do not support for bonding device */ |
| if ((fc->real_dev->priv_flags & IFF_MASTER_ALB) || |
| (fc->real_dev->priv_flags & IFF_SLAVE_INACTIVE) || |
| (fc->real_dev->priv_flags & IFF_MASTER_8023AD)) { |
| return -EOPNOTSUPP; |
| } |
| |
| /* |
| * 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 = fc->real_dev->mtu - (sizeof(struct fcoe_hdr) + |
| sizeof(struct fcoe_crc_eof)); |
| if (fc_set_mfs(lp, mfs)) |
| return -EINVAL; |
| |
| /* offload features support */ |
| if (fc->real_dev->features & NETIF_F_SG) |
| lp->sg_supp = 1; |
| |
| #ifdef NETIF_F_FCOE_CRC |
| if (netdev->features & NETIF_F_FCOE_CRC) { |
| lp->crc_offload = 1; |
| printk(KERN_DEBUG "fcoe:%s supports FCCRC offload\n", |
| netdev->name); |
| } |
| #endif |
| #ifdef NETIF_F_FSO |
| if (netdev->features & NETIF_F_FSO) { |
| lp->seq_offload = 1; |
| lp->lso_max = netdev->gso_max_size; |
| printk(KERN_DEBUG "fcoe:%s supports LSO for max len 0x%x\n", |
| netdev->name, lp->lso_max); |
| } |
| #endif |
| if (netdev->fcoe_ddp_xid) { |
| lp->lro_enabled = 1; |
| lp->lro_xid = netdev->fcoe_ddp_xid; |
| printk(KERN_DEBUG "fcoe:%s supports LRO for max xid 0x%x\n", |
| netdev->name, lp->lro_xid); |
| } |
| skb_queue_head_init(&fc->fcoe_pending_queue); |
| fc->fcoe_pending_queue_active = 0; |
| |
| /* setup Source Mac Address */ |
| memcpy(fc->ctlr.ctl_src_addr, fc->real_dev->dev_addr, |
| fc->real_dev->addr_len); |
| |
| wwnn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 1, 0); |
| fc_set_wwnn(lp, wwnn); |
| /* XXX - 3rd arg needs to be vlan id */ |
| wwpn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 2, 0); |
| fc_set_wwpn(lp, wwpn); |
| |
| /* |
| * Add FCoE MAC address as second unicast MAC address |
| * or enter promiscuous mode if not capable of listening |
| * for multiple unicast MACs. |
| */ |
| rtnl_lock(); |
| memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); |
| dev_unicast_add(fc->real_dev, flogi_maddr, ETH_ALEN); |
| dev_mc_add(fc->real_dev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0); |
| rtnl_unlock(); |
| |
| /* |
| * setup the receive function from ethernet driver |
| * on the ethertype for the given device |
| */ |
| fc->fcoe_packet_type.func = fcoe_rcv; |
| fc->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE); |
| fc->fcoe_packet_type.dev = fc->real_dev; |
| dev_add_pack(&fc->fcoe_packet_type); |
| |
| return 0; |
| } |
| |
| /** |
| * fcoe_shost_config() - Sets up fc_lport->host |
| * @lp : ptr to the fc_lport |
| * @shost : ptr to the associated scsi host |
| * @dev : device associated to 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 *lp, struct Scsi_Host *shost, |
| struct device *dev) |
| { |
| int rc = 0; |
| |
| /* lport scsi host config */ |
| lp->host = shost; |
| |
| lp->host->max_lun = FCOE_MAX_LUN; |
| lp->host->max_id = FCOE_MAX_FCP_TARGET; |
| lp->host->max_channel = 0; |
| lp->host->transportt = scsi_transport_fcoe_sw; |
| |
| /* add the new host to the SCSI-ml */ |
| rc = scsi_add_host(lp->host, dev); |
| if (rc) { |
| FC_DBG("fcoe_shost_config:error on scsi_add_host\n"); |
| return rc; |
| } |
| sprintf(fc_host_symbolic_name(lp->host), "%s v%s over %s", |
| FCOE_NAME, FCOE_VERSION, |
| fcoe_netdev(lp)->name); |
| |
| return 0; |
| } |
| |
| /** |
| * fcoe_em_config() - allocates em for this lport |
| * @lp: the port that em is to allocated for |
| * |
| * Returns : 0 on success |
| */ |
| static inline int fcoe_em_config(struct fc_lport *lp) |
| { |
| BUG_ON(lp->emp); |
| |
| lp->emp = fc_exch_mgr_alloc(lp, FC_CLASS_3, |
| FCOE_MIN_XID, FCOE_MAX_XID); |
| if (!lp->emp) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| /** |
| * fcoe_if_destroy() - FCoE software HBA tear-down function |
| * @netdev: ptr to the associated net_device |
| * |
| * Returns: 0 if link is OK for use by FCoE. |
| */ |
| static int fcoe_if_destroy(struct net_device *netdev) |
| { |
| struct fc_lport *lp = NULL; |
| struct fcoe_softc *fc; |
| u8 flogi_maddr[ETH_ALEN]; |
| |
| BUG_ON(!netdev); |
| |
| printk(KERN_DEBUG "fcoe_if_destroy:interface on %s\n", |
| netdev->name); |
| |
| lp = fcoe_hostlist_lookup(netdev); |
| if (!lp) |
| return -ENODEV; |
| |
| fc = lport_priv(lp); |
| |
| /* Logout of the fabric */ |
| fc_fabric_logoff(lp); |
| |
| /* Remove the instance from fcoe's list */ |
| fcoe_hostlist_remove(lp); |
| |
| /* Don't listen for Ethernet packets anymore */ |
| dev_remove_pack(&fc->fcoe_packet_type); |
| dev_remove_pack(&fc->fip_packet_type); |
| fcoe_ctlr_destroy(&fc->ctlr); |
| |
| /* Cleanup the fc_lport */ |
| fc_lport_destroy(lp); |
| fc_fcp_destroy(lp); |
| |
| /* Detach from the scsi-ml */ |
| fc_remove_host(lp->host); |
| scsi_remove_host(lp->host); |
| |
| /* There are no more rports or I/O, free the EM */ |
| if (lp->emp) |
| fc_exch_mgr_free(lp->emp); |
| |
| /* Delete secondary MAC addresses */ |
| rtnl_lock(); |
| memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); |
| dev_unicast_delete(fc->real_dev, flogi_maddr, ETH_ALEN); |
| if (!is_zero_ether_addr(fc->ctlr.data_src_addr)) |
| dev_unicast_delete(fc->real_dev, |
| fc->ctlr.data_src_addr, ETH_ALEN); |
| dev_mc_delete(fc->real_dev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0); |
| rtnl_unlock(); |
| |
| /* Free the per-CPU receive threads */ |
| fcoe_percpu_clean(lp); |
| |
| /* Free existing skbs */ |
| fcoe_clean_pending_queue(lp); |
| |
| /* Free memory used by statistical counters */ |
| fc_lport_free_stats(lp); |
| |
| /* Release the net_device and Scsi_Host */ |
| dev_put(fc->real_dev); |
| scsi_host_put(lp->host); |
| |
| return 0; |
| } |
| |
| /* |
| * fcoe_ddp_setup - calls LLD's ddp_setup through net_device |
| * @lp: the corresponding fc_lport |
| * @xid: the exchange id for this ddp transfer |
| * @sgl: the scatterlist describing this transfer |
| * @sgc: number of sg items |
| * |
| * Returns : 0 no ddp |
| */ |
| static int fcoe_ddp_setup(struct fc_lport *lp, u16 xid, |
| struct scatterlist *sgl, unsigned int sgc) |
| { |
| struct net_device *n = fcoe_netdev(lp); |
| |
| if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_setup) |
| return n->netdev_ops->ndo_fcoe_ddp_setup(n, xid, sgl, sgc); |
| |
| return 0; |
| } |
| |
| /* |
| * fcoe_ddp_done - calls LLD's ddp_done through net_device |
| * @lp: the corresponding fc_lport |
| * @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 *lp, u16 xid) |
| { |
| struct net_device *n = fcoe_netdev(lp); |
| |
| if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_done) |
| return n->netdev_ops->ndo_fcoe_ddp_done(n, xid); |
| return 0; |
| } |
| |
| static struct libfc_function_template fcoe_libfc_fcn_templ = { |
| .frame_send = fcoe_xmit, |
| .ddp_setup = fcoe_ddp_setup, |
| .ddp_done = fcoe_ddp_done, |
| }; |
| |
| /** |
| * fcoe_fip_recv - handle a received FIP frame. |
| * @skb: the receive skb |
| * @dev: associated &net_device |
| * @ptype: the &packet_type structure which was used to register this handler. |
| * @orig_dev: original receive &net_device, in case @dev is a bond. |
| * |
| * Returns: 0 for success |
| */ |
| static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *dev, |
| struct packet_type *ptype, |
| struct net_device *orig_dev) |
| { |
| struct fcoe_softc *fc; |
| |
| fc = container_of(ptype, struct fcoe_softc, fip_packet_type); |
| fcoe_ctlr_recv(&fc->ctlr, skb); |
| return 0; |
| } |
| |
| /** |
| * fcoe_fip_send() - send an Ethernet-encapsulated FIP frame. |
| * @fip: FCoE controller. |
| * @skb: FIP Packet. |
| */ |
| static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb) |
| { |
| skb->dev = fcoe_from_ctlr(fip)->real_dev; |
| dev_queue_xmit(skb); |
| } |
| |
| /** |
| * fcoe_update_src_mac() - Update Ethernet MAC filters. |
| * @fip: FCoE controller. |
| * @old: Unicast MAC address to delete if the MAC is non-zero. |
| * @new: 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 fcoe_ctlr *fip, u8 *old, u8 *new) |
| { |
| struct fcoe_softc *fc; |
| |
| fc = fcoe_from_ctlr(fip); |
| rtnl_lock(); |
| if (!is_zero_ether_addr(old)) |
| dev_unicast_delete(fc->real_dev, old, ETH_ALEN); |
| dev_unicast_add(fc->real_dev, new, ETH_ALEN); |
| rtnl_unlock(); |
| } |
| |
| /** |
| * fcoe_if_create() - this function creates the fcoe interface |
| * @netdev: pointer the associated netdevice |
| * |
| * Creates fc_lport struct and scsi_host for lport, configures lport |
| * and starts fabric login. |
| * |
| * Returns : 0 on success |
| */ |
| static int fcoe_if_create(struct net_device *netdev) |
| { |
| int rc; |
| struct fc_lport *lp = NULL; |
| struct fcoe_softc *fc; |
| struct Scsi_Host *shost; |
| |
| BUG_ON(!netdev); |
| |
| printk(KERN_DEBUG "fcoe_if_create:interface on %s\n", |
| netdev->name); |
| |
| lp = fcoe_hostlist_lookup(netdev); |
| if (lp) |
| return -EEXIST; |
| |
| shost = libfc_host_alloc(&fcoe_shost_template, |
| sizeof(struct fcoe_softc)); |
| if (!shost) { |
| FC_DBG("Could not allocate host structure\n"); |
| return -ENOMEM; |
| } |
| lp = shost_priv(shost); |
| fc = lport_priv(lp); |
| |
| /* configure fc_lport, e.g., em */ |
| rc = fcoe_lport_config(lp); |
| if (rc) { |
| FC_DBG("Could not configure lport\n"); |
| goto out_host_put; |
| } |
| |
| /* configure lport network properties */ |
| rc = fcoe_netdev_config(lp, netdev); |
| if (rc) { |
| FC_DBG("Could not configure netdev for lport\n"); |
| goto out_host_put; |
| } |
| |
| /* |
| * Initialize FIP. |
| */ |
| fcoe_ctlr_init(&fc->ctlr); |
| fc->ctlr.send = fcoe_fip_send; |
| fc->ctlr.update_mac = fcoe_update_src_mac; |
| |
| fc->fip_packet_type.func = fcoe_fip_recv; |
| fc->fip_packet_type.type = htons(ETH_P_FIP); |
| fc->fip_packet_type.dev = fc->real_dev; |
| dev_add_pack(&fc->fip_packet_type); |
| |
| /* configure lport scsi host properties */ |
| rc = fcoe_shost_config(lp, shost, &netdev->dev); |
| if (rc) { |
| FC_DBG("Could not configure shost for lport\n"); |
| goto out_host_put; |
| } |
| |
| /* lport exch manager allocation */ |
| rc = fcoe_em_config(lp); |
| if (rc) { |
| FC_DBG("Could not configure em for lport\n"); |
| goto out_host_put; |
| } |
| |
| /* Initialize the library */ |
| rc = fcoe_libfc_config(lp, &fcoe_libfc_fcn_templ); |
| if (rc) { |
| FC_DBG("Could not configure libfc for lport!\n"); |
| goto out_lp_destroy; |
| } |
| |
| /* add to lports list */ |
| fcoe_hostlist_add(lp); |
| |
| lp->boot_time = jiffies; |
| |
| fc_fabric_login(lp); |
| |
| if (!fcoe_link_ok(lp)) |
| fcoe_ctlr_link_up(&fc->ctlr); |
| |
| dev_hold(netdev); |
| |
| return rc; |
| |
| out_lp_destroy: |
| fc_exch_mgr_free(lp->emp); /* Free the EM */ |
| out_host_put: |
| scsi_host_put(lp->host); |
| return rc; |
| } |
| |
| /** |
| * fcoe_if_init() - attach to scsi transport |
| * |
| * Returns : 0 on success |
| */ |
| static int __init fcoe_if_init(void) |
| { |
| /* attach to scsi transport */ |
| scsi_transport_fcoe_sw = |
| fc_attach_transport(&fcoe_transport_function); |
| |
| if (!scsi_transport_fcoe_sw) { |
| printk(KERN_ERR "fcoe_init:fc_attach_transport() failed\n"); |
| return -ENODEV; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * fcoe_if_exit() - detach from scsi transport |
| * |
| * Returns : 0 on success |
| */ |
| int __exit fcoe_if_exit(void) |
| { |
| fc_release_transport(scsi_transport_fcoe_sw); |
| return 0; |
| } |
| |
| /** |
| * fcoe_percpu_thread_create() - Create a receive thread for an online cpu |
| * @cpu: cpu index for the online cpu |
| */ |
| 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(p->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() - removes the rx thread for the given cpu |
| * @cpu: cpu index the rx thread is to be removed |
| * |
| * 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 */ |
| |
| printk(KERN_DEBUG "fcoe: 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) { |
| FC_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() - fcoe cpu hotplug event callback |
| * @nfb: callback data block |
| * @action: event triggering the callback |
| * @hcpu: index for the cpu of this event |
| * |
| * 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: |
| FC_DBG("CPU %x online: Create Rx thread\n", cpu); |
| fcoe_percpu_thread_create(cpu); |
| break; |
| case CPU_DEAD: |
| case CPU_DEAD_FROZEN: |
| FC_DBG("CPU %x offline: Remove Rx thread\n", cpu); |
| fcoe_percpu_thread_destroy(cpu); |
| break; |
| default: |
| break; |
| } |
| return NOTIFY_OK; |
| } |
| |
| static struct notifier_block fcoe_cpu_notifier = { |
| .notifier_call = fcoe_cpu_callback, |
| }; |
| |
| /** |
| * fcoe_rcv() - this is the fcoe receive function called by NET_RX_SOFTIRQ |
| * @skb: the receive skb |
| * @dev: associated net device |
| * @ptype: context |
| * @olddev: last device |
| * |
| * this function will receive the packet and build fc frame and pass it up |
| * |
| * Returns: 0 for success |
| */ |
| int fcoe_rcv(struct sk_buff *skb, struct net_device *dev, |
| struct packet_type *ptype, struct net_device *olddev) |
| { |
| struct fc_lport *lp; |
| struct fcoe_rcv_info *fr; |
| struct fcoe_softc *fc; |
| struct fc_frame_header *fh; |
| struct fcoe_percpu_s *fps; |
| unsigned short oxid; |
| unsigned int cpu = 0; |
| |
| fc = container_of(ptype, struct fcoe_softc, fcoe_packet_type); |
| lp = fc->ctlr.lp; |
| if (unlikely(lp == NULL)) { |
| FC_DBG("cannot find hba structure"); |
| goto err2; |
| } |
| if (!lp->link_up) |
| goto err2; |
| |
| if (unlikely(debug_fcoe)) { |
| FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p tail:%p " |
| "end:%p sum:%d dev:%s", skb->len, skb->data_len, |
| skb->head, skb->data, skb_tail_pointer(skb), |
| skb_end_pointer(skb), skb->csum, |
| skb->dev ? skb->dev->name : "<NULL>"); |
| |
| } |
| |
| /* check for FCOE packet type */ |
| if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) { |
| FC_DBG("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); |
| |
| oxid = ntohs(fh->fh_ox_id); |
| |
| fr = fcoe_dev_from_skb(skb); |
| fr->fr_dev = lp; |
| fr->ptype = ptype; |
| |
| #ifdef CONFIG_SMP |
| /* |
| * The incoming frame exchange id(oxid) is ANDed with num of online |
| * cpu bits to get cpu and then this cpu is used for selecting |
| * a per cpu kernel thread from fcoe_percpu. |
| */ |
| cpu = oxid & (num_online_cpus() - 1); |
| #endif |
| |
| 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. |
| */ |
| FC_DBG("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 = first_cpu(cpu_online_map); |
| 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. |
| */ |
| __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(lp)->ErrorFrames++; |
| |
| err2: |
| kfree_skb(skb); |
| return -1; |
| } |
| |
| /** |
| * fcoe_start_io() - pass to netdev to start xmit for fcoe |
| * @skb: the skb to be xmitted |
| * |
| * Returns: 0 for success |
| */ |
| static inline int fcoe_start_io(struct sk_buff *skb) |
| { |
| int rc; |
| |
| skb_get(skb); |
| rc = dev_queue_xmit(skb); |
| if (rc != 0) |
| return rc; |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| /** |
| * fcoe_get_paged_crc_eof() - in case we need to alloc a page for crc_eof |
| * @skb: the skb to be xmitted |
| * @tlen: total len |
| * |
| * 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 FC CRC in this fcoe skb |
| * @fp: the fc_frame containing data to be checksummed |
| * |
| * This uses crc32() to calculate the crc for fc frame |
| * Return : 32 bit crc |
| */ |
| 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() - FCoE frame transmit function |
| * @lp: the associated local port |
| * @fp: the fc_frame to be transmitted |
| * |
| * Return : 0 for success |
| */ |
| int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp) |
| { |
| int wlen, rc = 0; |
| 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_softc *fc; |
| u8 sof, eof; |
| struct fcoe_hdr *hp; |
| |
| WARN_ON((fr_len(fp) % sizeof(u32)) != 0); |
| |
| fc = lport_priv(lp); |
| fh = fc_frame_header_get(fp); |
| skb = fp_skb(fp); |
| wlen = skb->len / FCOE_WORD_TO_BYTE; |
| |
| if (!lp->link_up) { |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ) && |
| fcoe_ctlr_els_send(&fc->ctlr, skb)) |
| return 0; |
| |
| sof = fr_sof(fp); |
| eof = fr_eof(fp); |
| |
| elen = (fc->real_dev->priv_flags & IFF_802_1Q_VLAN) ? |
| sizeof(struct vlan_ethhdr) : 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(lp->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 fc 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/fc */ |
| skb_push(skb, elen + hlen); |
| skb_reset_mac_header(skb); |
| skb_reset_network_header(skb); |
| skb->mac_len = elen; |
| skb->protocol = htons(ETH_P_FCOE); |
| skb->dev = fc->real_dev; |
| |
| /* fill up mac and fcoe headers */ |
| eh = eth_hdr(skb); |
| eh->h_proto = htons(ETH_P_FCOE); |
| if (fc->ctlr.map_dest) |
| fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id); |
| else |
| /* insert GW address */ |
| memcpy(eh->h_dest, fc->ctlr.dest_addr, ETH_ALEN); |
| |
| if (unlikely(fc->ctlr.flogi_oxid != FC_XID_UNKNOWN)) |
| memcpy(eh->h_source, fc->ctlr.ctl_src_addr, ETH_ALEN); |
| else |
| memcpy(eh->h_source, fc->ctlr.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; |
| |
| #ifdef NETIF_F_FSO |
| /* fcoe lso, mss is in max_payload which is non-zero for FCP data */ |
| if (lp->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; |
| } |
| #endif |
| /* update tx stats: regardless if LLD fails */ |
| stats = fc_lport_get_stats(lp); |
| stats->TxFrames++; |
| stats->TxWords += wlen; |
| |
| /* send down to lld */ |
| fr_dev(fp) = lp; |
| if (fc->fcoe_pending_queue.qlen) |
| rc = fcoe_check_wait_queue(lp); |
| |
| if (rc == 0) |
| rc = fcoe_start_io(skb); |
| |
| if (rc) { |
| spin_lock_bh(&fc->fcoe_pending_queue.lock); |
| __skb_queue_tail(&fc->fcoe_pending_queue, skb); |
| spin_unlock_bh(&fc->fcoe_pending_queue.lock); |
| if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH) |
| lp->qfull = 1; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * fcoe_percpu_receive_thread() - recv thread per cpu |
| * @arg: ptr to the fcoe per cpu struct |
| * |
| * Return: 0 for success |
| */ |
| int fcoe_percpu_receive_thread(void *arg) |
| { |
| struct fcoe_percpu_s *p = arg; |
| u32 fr_len; |
| struct fc_lport *lp; |
| struct fcoe_rcv_info *fr; |
| struct fcoe_dev_stats *stats; |
| struct fc_frame_header *fh; |
| struct sk_buff *skb; |
| struct fcoe_crc_eof crc_eof; |
| struct fc_frame *fp; |
| u8 *mac = NULL; |
| struct fcoe_softc *fc; |
| struct fcoe_hdr *hp; |
| |
| set_user_nice(current, -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); |
| fr = fcoe_dev_from_skb(skb); |
| lp = fr->fr_dev; |
| if (unlikely(lp == NULL)) { |
| FC_DBG("invalid HBA Structure"); |
| kfree_skb(skb); |
| continue; |
| } |
| |
| if (unlikely(debug_fcoe)) { |
| FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p " |
| "tail:%p end:%p sum:%d dev:%s", |
| skb->len, skb->data_len, |
| skb->head, skb->data, skb_tail_pointer(skb), |
| skb_end_pointer(skb), skb->csum, |
| skb->dev ? skb->dev->name : "<NULL>"); |
| } |
| |
| /* |
| * Save source MAC address before discarding header. |
| */ |
| fc = lport_priv(lp); |
| if (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(lp); |
| if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) { |
| if (stats->ErrorFrames < 5) |
| printk(KERN_WARNING "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); |
| continue; |
| } |
| |
| 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) = lp; |
| fr_sof(fp) = hp->fcoe_sof; |
| |
| /* Copy out the CRC and EOF trailer for access */ |
| if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) { |
| kfree_skb(skb); |
| continue; |
| } |
| fr_eof(fp) = crc_eof.fcoe_eof; |
| fr_crc(fp) = crc_eof.fcoe_crc32; |
| if (pskb_trim(skb, fr_len)) { |
| kfree_skb(skb); |
| continue; |
| } |
| |
| /* |
| * We only check CRC if no offload is available and if it is |
| * it's solicited data, in which case, the FCP layer would |
| * check it during the copy. |
| */ |
| if (lp->crc_offload && 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(lp, lp->emp, fp); |
| continue; |
| } |
| if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) { |
| if (le32_to_cpu(fr_crc(fp)) != |
| ~crc32(~0, skb->data, fr_len)) { |
| if (debug_fcoe || stats->InvalidCRCCount < 5) |
| printk(KERN_WARNING "fcoe: dropping " |
| "frame with CRC error\n"); |
| stats->InvalidCRCCount++; |
| stats->ErrorFrames++; |
| fc_frame_free(fp); |
| continue; |
| } |
| fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; |
| } |
| if (unlikely(fc->ctlr.flogi_oxid != FC_XID_UNKNOWN) && |
| fcoe_ctlr_recv_flogi(&fc->ctlr, fp, mac)) { |
| fc_frame_free(fp); |
| continue; |
| } |
| fc_exch_recv(lp, lp->emp, fp); |
| } |
| return 0; |
| } |
| |
| /** |
| * fcoe_watchdog() - fcoe timer callback |
| * @vp: |
| * |
| * This checks the pending queue length for fcoe and set lport qfull |
| * if the FCOE_MAX_QUEUE_DEPTH is reached. This is done for all fc_lport on the |
| * fcoe_hostlist. |
| * |
| * Returns: 0 for success |
| */ |
| void fcoe_watchdog(ulong vp) |
| { |
| struct fcoe_softc *fc; |
| |
| read_lock(&fcoe_hostlist_lock); |
| list_for_each_entry(fc, &fcoe_hostlist, list) { |
| if (fc->ctlr.lp) |
| fcoe_check_wait_queue(fc->ctlr.lp); |
| } |
| read_unlock(&fcoe_hostlist_lock); |
| |
| fcoe_timer.expires = jiffies + (1 * HZ); |
| add_timer(&fcoe_timer); |
| } |
| |
| |
| /** |
| * fcoe_check_wait_queue() - attempt to clear the transmit backlog |
| * @lp: the fc_lport |
| * |
| * This empties the wait_queue, dequeue the head of the wait_queue queue |
| * and calls fcoe_start_io() for each packet, if all skb have been |
| * transmitted, return qlen or -1 if a error occurs, then restore |
| * wait_queue and try again later. |
| * |
| * The wait_queue is used when the skb transmit fails. skb will go |
| * in the wait_queue which will be emptied by the timer function or |
| * by the next skb transmit. |
| * |
| * Returns: 0 for success |
| */ |
| static int fcoe_check_wait_queue(struct fc_lport *lp) |
| { |
| struct fcoe_softc *fc = lport_priv(lp); |
| struct sk_buff *skb; |
| int rc = -1; |
| |
| spin_lock_bh(&fc->fcoe_pending_queue.lock); |
| if (fc->fcoe_pending_queue_active) |
| goto out; |
| fc->fcoe_pending_queue_active = 1; |
| |
| while (fc->fcoe_pending_queue.qlen) { |
| /* keep qlen > 0 until fcoe_start_io succeeds */ |
| fc->fcoe_pending_queue.qlen++; |
| skb = __skb_dequeue(&fc->fcoe_pending_queue); |
| |
| spin_unlock_bh(&fc->fcoe_pending_queue.lock); |
| rc = fcoe_start_io(skb); |
| spin_lock_bh(&fc->fcoe_pending_queue.lock); |
| |
| if (rc) { |
| __skb_queue_head(&fc->fcoe_pending_queue, skb); |
| /* undo temporary increment above */ |
| fc->fcoe_pending_queue.qlen--; |
| break; |
| } |
| /* undo temporary increment above */ |
| fc->fcoe_pending_queue.qlen--; |
| } |
| |
| if (fc->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH) |
| lp->qfull = 0; |
| fc->fcoe_pending_queue_active = 0; |
| rc = fc->fcoe_pending_queue.qlen; |
| out: |
| spin_unlock_bh(&fc->fcoe_pending_queue.lock); |
| return rc; |
| } |
| |
| /** |
| * fcoe_dev_setup() - setup link change notification interface |
| */ |
| static void fcoe_dev_setup(void) |
| { |
| register_netdevice_notifier(&fcoe_notifier); |
| } |
| |
| /** |
| * fcoe_dev_cleanup() - cleanup link change notification interface |
| */ |
| static void fcoe_dev_cleanup(void) |
| { |
| unregister_netdevice_notifier(&fcoe_notifier); |
| } |
| |
| /** |
| * fcoe_device_notification() - netdev event notification callback |
| * @notifier: context of the notification |
| * @event: type of event |
| * @ptr: fixed array for output parsed ifname |
| * |
| * This function is called by the ethernet driver in case of link change event |
| * |
| * Returns: 0 for success |
| */ |
| static int fcoe_device_notification(struct notifier_block *notifier, |
| ulong event, void *ptr) |
| { |
| struct fc_lport *lp = NULL; |
| struct net_device *real_dev = ptr; |
| struct fcoe_softc *fc; |
| struct fcoe_dev_stats *stats; |
| u32 link_possible = 1; |
| u32 mfs; |
| int rc = NOTIFY_OK; |
| |
| read_lock(&fcoe_hostlist_lock); |
| list_for_each_entry(fc, &fcoe_hostlist, list) { |
| if (fc->real_dev == real_dev) { |
| lp = fc->ctlr.lp; |
| break; |
| } |
| } |
| read_unlock(&fcoe_hostlist_lock); |
| if (lp == NULL) { |
| 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: |
| mfs = fc->real_dev->mtu - |
| (sizeof(struct fcoe_hdr) + |
| sizeof(struct fcoe_crc_eof)); |
| if (mfs >= FC_MIN_MAX_FRAME) |
| fc_set_mfs(lp, mfs); |
| break; |
| case NETDEV_REGISTER: |
| break; |
| default: |
| FC_DBG("Unknown event %ld from netdev netlink\n", event); |
| } |
| if (link_possible && !fcoe_link_ok(lp)) |
| fcoe_ctlr_link_up(&fc->ctlr); |
| else if (fcoe_ctlr_link_down(&fc->ctlr)) { |
| stats = fc_lport_get_stats(lp); |
| stats->LinkFailureCount++; |
| fcoe_clean_pending_queue(lp); |
| } |
| out: |
| return rc; |
| } |
| |
| /** |
| * fcoe_if_to_netdev() - parse a name buffer to get netdev |
| * @buffer: incoming buffer to be copied |
| * |
| * Returns: NULL or 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_netdev_to_module_owner() - finds out the driver module of the netdev |
| * @netdev: the target netdev |
| * |
| * Returns: ptr to the struct module, NULL for failure |
| */ |
| static struct module * |
| fcoe_netdev_to_module_owner(const struct net_device *netdev) |
| { |
| struct device *dev; |
| |
| if (!netdev) |
| return NULL; |
| |
| dev = netdev->dev.parent; |
| if (!dev) |
| return NULL; |
| |
| if (!dev->driver) |
| return NULL; |
| |
| return dev->driver->owner; |
| } |
| |
| /** |
| * fcoe_ethdrv_get() - Hold the Ethernet driver |
| * @netdev: the target netdev |
| * |
| * Holds the Ethernet driver module by try_module_get() for |
| * the corresponding netdev. |
| * |
| * Returns: 0 for success |
| */ |
| static int fcoe_ethdrv_get(const struct net_device *netdev) |
| { |
| struct module *owner; |
| |
| owner = fcoe_netdev_to_module_owner(netdev); |
| if (owner) { |
| printk(KERN_DEBUG "fcoe:hold driver module %s for %s\n", |
| module_name(owner), netdev->name); |
| return try_module_get(owner); |
| } |
| return -ENODEV; |
| } |
| |
| /** |
| * fcoe_ethdrv_put() - Release the Ethernet driver |
| * @netdev: the target netdev |
| * |
| * Releases the Ethernet driver module by module_put for |
| * the corresponding netdev. |
| * |
| * Returns: 0 for success |
| */ |
| static int fcoe_ethdrv_put(const struct net_device *netdev) |
| { |
| struct module *owner; |
| |
| owner = fcoe_netdev_to_module_owner(netdev); |
| if (owner) { |
| printk(KERN_DEBUG "fcoe:release driver module %s for %s\n", |
| module_name(owner), netdev->name); |
| module_put(owner); |
| return 0; |
| } |
| return -ENODEV; |
| } |
| |
| /** |
| * fcoe_destroy() - handles the destroy from sysfs |
| * @buffer: expected to be an eth if name |
| * @kp: associated kernel param |
| * |
| * Returns: 0 for success |
| */ |
| static int fcoe_destroy(const char *buffer, struct kernel_param *kp) |
| { |
| int rc; |
| struct net_device *netdev; |
| |
| netdev = fcoe_if_to_netdev(buffer); |
| if (!netdev) { |
| rc = -ENODEV; |
| goto out_nodev; |
| } |
| /* look for existing lport */ |
| if (!fcoe_hostlist_lookup(netdev)) { |
| rc = -ENODEV; |
| goto out_putdev; |
| } |
| rc = fcoe_if_destroy(netdev); |
| if (rc) { |
| printk(KERN_ERR "fcoe: fcoe_if_destroy(%s) failed\n", |
| netdev->name); |
| rc = -EIO; |
| goto out_putdev; |
| } |
| fcoe_ethdrv_put(netdev); |
| rc = 0; |
| out_putdev: |
| dev_put(netdev); |
| out_nodev: |
| return rc; |
| } |
| |
| /** |
| * fcoe_create() - Handles the create call from sysfs |
| * @buffer: expected to be an eth if name |
| * @kp: associated kernel param |
| * |
| * Returns: 0 for success |
| */ |
| static int fcoe_create(const char *buffer, struct kernel_param *kp) |
| { |
| int rc; |
| struct net_device *netdev; |
| |
| netdev = fcoe_if_to_netdev(buffer); |
| if (!netdev) { |
| rc = -ENODEV; |
| goto out_nodev; |
| } |
| /* look for existing lport */ |
| if (fcoe_hostlist_lookup(netdev)) { |
| rc = -EEXIST; |
| goto out_putdev; |
| } |
| fcoe_ethdrv_get(netdev); |
| |
| rc = fcoe_if_create(netdev); |
| if (rc) { |
| printk(KERN_ERR "fcoe: fcoe_if_create(%s) failed\n", |
| netdev->name); |
| fcoe_ethdrv_put(netdev); |
| rc = -EIO; |
| goto out_putdev; |
| } |
| rc = 0; |
| out_putdev: |
| dev_put(netdev); |
| out_nodev: |
| return rc; |
| } |
| |
| module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR); |
| __MODULE_PARM_TYPE(create, "string"); |
| MODULE_PARM_DESC(create, "Create fcoe port using net device passed in."); |
| module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR); |
| __MODULE_PARM_TYPE(destroy, "string"); |
| MODULE_PARM_DESC(destroy, "Destroy fcoe port"); |
| |
| /** |
| * fcoe_link_ok() - Check if link is ok for the fc_lport |
| * @lp: ptr to the fc_lport |
| * |
| * Any permanently-disqualifying conditions have been previously checked. |
| * This also updates the speed setting, which may change with link for 100/1000. |
| * |
| * This function should probably be checking for PAUSE support at some point |
| * in the future. Currently Per-priority-pause is not determinable using |
| * ethtool, so we shouldn't be restrictive until that problem is resolved. |
| * |
| * Returns: 0 if link is OK for use by FCoE. |
| * |
| */ |
| int fcoe_link_ok(struct fc_lport *lp) |
| { |
| struct fcoe_softc *fc = lport_priv(lp); |
| struct net_device *dev = fc->real_dev; |
| struct ethtool_cmd ecmd = { ETHTOOL_GSET }; |
| int rc = 0; |
| |
| if ((dev->flags & IFF_UP) && netif_carrier_ok(dev)) { |
| dev = fc->phys_dev; |
| if (dev->ethtool_ops->get_settings) { |
| dev->ethtool_ops->get_settings(dev, &ecmd); |
| lp->link_supported_speeds &= |
| ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT); |
| if (ecmd.supported & (SUPPORTED_1000baseT_Half | |
| SUPPORTED_1000baseT_Full)) |
| lp->link_supported_speeds |= FC_PORTSPEED_1GBIT; |
| if (ecmd.supported & SUPPORTED_10000baseT_Full) |
| lp->link_supported_speeds |= |
| FC_PORTSPEED_10GBIT; |
| if (ecmd.speed == SPEED_1000) |
| lp->link_speed = FC_PORTSPEED_1GBIT; |
| if (ecmd.speed == SPEED_10000) |
| lp->link_speed = FC_PORTSPEED_10GBIT; |
| } |
| } else |
| rc = -1; |
| |
| return rc; |
| } |
| |
| /** |
| * fcoe_percpu_clean() - Clear the pending skbs for an lport |
| * @lp: the fc_lport |
| */ |
| void fcoe_percpu_clean(struct fc_lport *lp) |
| { |
| 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 == lp) { |
| __skb_unlink(skb, list); |
| kfree_skb(skb); |
| } |
| } |
| spin_unlock_bh(&pp->fcoe_rx_list.lock); |
| } |
| } |
| |
| /** |
| * fcoe_clean_pending_queue() - Dequeue a skb and free it |
| * @lp: the corresponding fc_lport |
| * |
| * Returns: none |
| */ |
| void fcoe_clean_pending_queue(struct fc_lport *lp) |
| { |
| struct fcoe_softc *fc = lport_priv(lp); |
| struct sk_buff *skb; |
| |
| spin_lock_bh(&fc->fcoe_pending_queue.lock); |
| while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) { |
| spin_unlock_bh(&fc->fcoe_pending_queue.lock); |
| kfree_skb(skb); |
| spin_lock_bh(&fc->fcoe_pending_queue.lock); |
| } |
| spin_unlock_bh(&fc->fcoe_pending_queue.lock); |
| } |
| |
| /** |
| * fcoe_reset() - Resets the fcoe |
| * @shost: shost the reset is from |
| * |
| * Returns: always 0 |
| */ |
| int fcoe_reset(struct Scsi_Host *shost) |
| { |
| struct fc_lport *lport = shost_priv(shost); |
| fc_lport_reset(lport); |
| return 0; |
| } |
| |
| /** |
| * fcoe_hostlist_lookup_softc() - find the corresponding lport by a given device |
| * @dev: this is currently ptr to net_device |
| * |
| * Returns: NULL or the located fcoe_softc |
| */ |
| static struct fcoe_softc * |
| fcoe_hostlist_lookup_softc(const struct net_device *dev) |
| { |
| struct fcoe_softc *fc; |
| |
| read_lock(&fcoe_hostlist_lock); |
| list_for_each_entry(fc, &fcoe_hostlist, list) { |
| if (fc->real_dev == dev) { |
| read_unlock(&fcoe_hostlist_lock); |
| return fc; |
| } |
| } |
| read_unlock(&fcoe_hostlist_lock); |
| return NULL; |
| } |
| |
| /** |
| * fcoe_hostlist_lookup() - Find the corresponding lport by netdev |
| * @netdev: ptr to net_device |
| * |
| * Returns: 0 for success |
| */ |
| struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev) |
| { |
| struct fcoe_softc *fc; |
| |
| fc = fcoe_hostlist_lookup_softc(netdev); |
| |
| return (fc) ? fc->ctlr.lp : NULL; |
| } |
| |
| /** |
| * fcoe_hostlist_add() - Add a lport to lports list |
| * @lp: ptr to the fc_lport to be added |
| * |
| * Returns: 0 for success |
| */ |
| int fcoe_hostlist_add(const struct fc_lport *lp) |
| { |
| struct fcoe_softc *fc; |
| |
| fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp)); |
| if (!fc) { |
| fc = lport_priv(lp); |
| write_lock_bh(&fcoe_hostlist_lock); |
| list_add_tail(&fc->list, &fcoe_hostlist); |
| write_unlock_bh(&fcoe_hostlist_lock); |
| } |
| return 0; |
| } |
| |
| /** |
| * fcoe_hostlist_remove() - remove a lport from lports list |
| * @lp: ptr to the fc_lport to be removed |
| * |
| * Returns: 0 for success |
| */ |
| int fcoe_hostlist_remove(const struct fc_lport *lp) |
| { |
| struct fcoe_softc *fc; |
| |
| fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp)); |
| BUG_ON(!fc); |
| write_lock_bh(&fcoe_hostlist_lock); |
| list_del(&fc->list); |
| write_unlock_bh(&fcoe_hostlist_lock); |
| |
| return 0; |
| } |
| |
| /** |
| * fcoe_init() - fcoe module loading initialization |
| * |
| * Returns 0 on success, negative on failure |
| */ |
| static int __init fcoe_init(void) |
| { |
| unsigned int cpu; |
| int rc = 0; |
| struct fcoe_percpu_s *p; |
| |
| INIT_LIST_HEAD(&fcoe_hostlist); |
| rwlock_init(&fcoe_hostlist_lock); |
| |
| 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(); |
| |
| setup_timer(&fcoe_timer, fcoe_watchdog, 0); |
| |
| mod_timer(&fcoe_timer, jiffies + (10 * HZ)); |
| |
| fcoe_if_init(); |
| |
| return 0; |
| |
| out_free: |
| for_each_online_cpu(cpu) { |
| fcoe_percpu_thread_destroy(cpu); |
| } |
| |
| return rc; |
| } |
| module_init(fcoe_init); |
| |
| /** |
| * fcoe_exit() - fcoe module unloading cleanup |
| * |
| * Returns 0 on success, negative on failure |
| */ |
| static void __exit fcoe_exit(void) |
| { |
| unsigned int cpu; |
| struct fcoe_softc *fc, *tmp; |
| |
| fcoe_dev_cleanup(); |
| |
| /* Stop the timer */ |
| del_timer_sync(&fcoe_timer); |
| |
| /* releases the associated fcoe hosts */ |
| list_for_each_entry_safe(fc, tmp, &fcoe_hostlist, list) |
| fcoe_if_destroy(fc->real_dev); |
| |
| unregister_hotcpu_notifier(&fcoe_cpu_notifier); |
| |
| for_each_online_cpu(cpu) { |
| fcoe_percpu_thread_destroy(cpu); |
| } |
| |
| /* detach from scsi transport */ |
| fcoe_if_exit(); |
| } |
| module_exit(fcoe_exit); |