| /* |
| * 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/slab.h> |
| #include <linux/cpu.h> |
| #include <linux/fs.h> |
| #include <linux/sysfs.h> |
| #include <linux/ctype.h> |
| #include <linux/workqueue.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); |
| |
| static struct workqueue_struct *fcoe_wq; |
| |
| /* 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_percpu_clean(struct fc_lport *); |
| static int fcoe_link_speed_update(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 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_ddp_target(struct fc_lport *, u16, struct scatterlist *, |
| unsigned int); |
| static int fcoe_cpu_callback(struct notifier_block *, unsigned long, void *); |
| |
| static bool fcoe_match(struct net_device *netdev); |
| static int fcoe_create(struct net_device *netdev, enum fip_state fip_mode); |
| static int fcoe_destroy(struct net_device *netdev); |
| static int fcoe_enable(struct net_device *netdev); |
| static int fcoe_disable(struct net_device *netdev); |
| |
| 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 *); |
| |
| /* 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_nport_scsi_transport; |
| static struct scsi_transport_template *fcoe_vport_scsi_transport; |
| |
| 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 void fcoe_set_port_id(struct fc_lport *, u32, struct fc_frame *); |
| static int fcoe_validate_vport_create(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, |
| .ddp_target = fcoe_ddp_target, |
| .elsct_send = fcoe_elsct_send, |
| .get_lesb = fcoe_get_lesb, |
| .lport_set_port_id = fcoe_set_port_id, |
| }; |
| |
| struct fc_function_template fcoe_nport_fc_functions = { |
| .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_fc_functions = { |
| .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_BONDING && netdev->flags & IFF_MASTER) { |
| 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); |
| if (fip->mode == FIP_MODE_VN2VN) { |
| dev_mc_add(netdev, FIP_ALL_VN2VN_MACS); |
| dev_mc_add(netdev, FIP_ALL_P2P_MACS); |
| } else |
| dev_mc_add(netdev, FIP_ALL_ENODE_MACS); |
| |
| /* |
| * 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 |
| * @fip_mode: The mode to use for FIP |
| * |
| * Returns: pointer to a struct fcoe_interface or NULL on error |
| */ |
| static struct fcoe_interface *fcoe_interface_create(struct net_device *netdev, |
| enum fip_state fip_mode) |
| { |
| struct fcoe_interface *fcoe; |
| int err; |
| |
| if (!try_module_get(THIS_MODULE)) { |
| FCOE_NETDEV_DBG(netdev, |
| "Could not get a reference to the module\n"); |
| fcoe = ERR_PTR(-EBUSY); |
| goto out; |
| } |
| |
| fcoe = kzalloc(sizeof(*fcoe), GFP_KERNEL); |
| if (!fcoe) { |
| FCOE_NETDEV_DBG(netdev, "Could not allocate fcoe structure\n"); |
| fcoe = ERR_PTR(-ENOMEM); |
| goto out_nomod; |
| } |
| |
| dev_hold(netdev); |
| kref_init(&fcoe->kref); |
| |
| /* |
| * Initialize FIP. |
| */ |
| fcoe_ctlr_init(&fcoe->ctlr, fip_mode); |
| 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); |
| fcoe = ERR_PTR(err); |
| goto out_nomod; |
| } |
| |
| goto out; |
| |
| out_nomod: |
| module_put(THIS_MODULE); |
| out: |
| return fcoe; |
| } |
| |
| /** |
| * 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); |
| module_put(THIS_MODULE); |
| } |
| |
| /** |
| * 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_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; |
| struct fcoe_port *port = lport_priv(fcoe->ctlr.lp); |
| |
| FCOE_NETDEV_DBG(netdev, "Destroying interface\n"); |
| |
| /* Logout of the fabric */ |
| fc_fabric_logoff(fcoe->ctlr.lp); |
| |
| /* Cleanup the fc_lport */ |
| fc_lport_destroy(fcoe->ctlr.lp); |
| |
| /* Stop the transmit retry timer */ |
| del_timer_sync(&port->timer); |
| |
| /* Free existing transmit skbs */ |
| fcoe_clean_pending_queue(fcoe->ctlr.lp); |
| |
| /* |
| * 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); |
| if (fip->mode == FIP_MODE_VN2VN) { |
| dev_mc_del(netdev, FIP_ALL_VN2VN_MACS); |
| dev_mc_del(netdev, FIP_ALL_P2P_MACS); |
| } else |
| dev_mc_del(netdev, FIP_ALL_ENODE_MACS); |
| |
| if (!is_zero_ether_addr(port->data_src_addr)) |
| dev_uc_del(netdev, port->data_src_addr); |
| |
| /* 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_put(fcoe); |
| } |
| |
| /** |
| * 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->priv; |
| |
| 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_get_wwn() - Get the world wide name from LLD if it supports it |
| * @netdev: the associated net device |
| * @wwn: the output WWN |
| * @type: the type of WWN (WWPN or WWNN) |
| * |
| * Returns: 0 for success |
| */ |
| static int fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type) |
| { |
| const struct net_device_ops *ops = netdev->netdev_ops; |
| |
| if (ops->ndo_fcoe_get_wwn) |
| return ops->ndo_fcoe_get_wwn(netdev, wwn, type); |
| return -EINVAL; |
| } |
| |
| /** |
| * fcoe_netdev_features_change - Updates the lport's offload flags based |
| * on the LLD netdev's FCoE feature flags |
| */ |
| static void fcoe_netdev_features_change(struct fc_lport *lport, |
| struct net_device *netdev) |
| { |
| mutex_lock(&lport->lp_mutex); |
| |
| if (netdev->features & NETIF_F_SG) |
| lport->sg_supp = 1; |
| else |
| lport->sg_supp = 0; |
| |
| if (netdev->features & NETIF_F_FCOE_CRC) { |
| lport->crc_offload = 1; |
| FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n"); |
| } else { |
| lport->crc_offload = 0; |
| } |
| |
| if (netdev->features & NETIF_F_FSO) { |
| lport->seq_offload = 1; |
| lport->lso_max = netdev->gso_max_size; |
| FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n", |
| lport->lso_max); |
| } else { |
| lport->seq_offload = 0; |
| lport->lso_max = 0; |
| } |
| |
| if (netdev->fcoe_ddp_xid) { |
| lport->lro_enabled = 1; |
| lport->lro_xid = netdev->fcoe_ddp_xid; |
| FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n", |
| lport->lro_xid); |
| } else { |
| lport->lro_enabled = 0; |
| lport->lro_xid = 0; |
| } |
| |
| mutex_unlock(&lport->lp_mutex); |
| } |
| |
| /** |
| * fcoe_netdev_config() - Set up net devive for SW FCoE |
| * @lport: The local port that is associated with the net device |
| * @netdev: The associated net device |
| * |
| * Must be called after fcoe_lport_config() as it will use local port mutex |
| * |
| * Returns: 0 for success |
| */ |
| static int fcoe_netdev_config(struct fc_lport *lport, struct net_device *netdev) |
| { |
| u32 mfs; |
| u64 wwnn, wwpn; |
| struct fcoe_interface *fcoe; |
| struct fcoe_port *port; |
| |
| /* Setup lport private data to point to fcoe softc */ |
| port = lport_priv(lport); |
| fcoe = port->priv; |
| |
| /* |
| * Determine max frame size based on underlying device and optional |
| * user-configured limit. If the MFS is too low, fcoe_link_ok() |
| * will return 0, so do this first. |
| */ |
| mfs = netdev->mtu; |
| if (netdev->features & NETIF_F_FCOE_MTU) { |
| mfs = FCOE_MTU; |
| FCOE_NETDEV_DBG(netdev, "Supports FCOE_MTU of %d bytes\n", mfs); |
| } |
| mfs -= (sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof)); |
| if (fc_set_mfs(lport, mfs)) |
| return -EINVAL; |
| |
| /* offload features support */ |
| fcoe_netdev_features_change(lport, netdev); |
| |
| skb_queue_head_init(&port->fcoe_pending_queue); |
| port->fcoe_pending_queue_active = 0; |
| setup_timer(&port->timer, fcoe_queue_timer, (unsigned long)lport); |
| |
| fcoe_link_speed_update(lport); |
| |
| if (!lport->vport) { |
| if (fcoe_get_wwn(netdev, &wwnn, NETDEV_FCOE_WWNN)) |
| wwnn = fcoe_wwn_from_mac(fcoe->ctlr.ctl_src_addr, 1, 0); |
| fc_set_wwnn(lport, wwnn); |
| if (fcoe_get_wwn(netdev, &wwpn, NETDEV_FCOE_WWPN)) |
| wwpn = fcoe_wwn_from_mac(fcoe->ctlr.ctl_src_addr, |
| 2, 0); |
| fc_set_wwpn(lport, wwpn); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * fcoe_shost_config() - Set up the SCSI host associated with a local port |
| * @lport: The local port |
| * @dev: The device associated with the SCSI host |
| * |
| * Must be called after fcoe_lport_config() and fcoe_netdev_config() |
| * |
| * Returns: 0 for success |
| */ |
| static int fcoe_shost_config(struct fc_lport *lport, struct device *dev) |
| { |
| int rc = 0; |
| |
| /* lport scsi host config */ |
| lport->host->max_lun = FCOE_MAX_LUN; |
| lport->host->max_id = FCOE_MAX_FCP_TARGET; |
| lport->host->max_channel = 0; |
| lport->host->max_cmd_len = FCOE_MAX_CMD_LEN; |
| |
| if (lport->vport) |
| lport->host->transportt = fcoe_vport_scsi_transport; |
| else |
| lport->host->transportt = fcoe_nport_scsi_transport; |
| |
| /* add the new host to the SCSI-ml */ |
| rc = scsi_add_host(lport->host, dev); |
| if (rc) { |
| FCOE_NETDEV_DBG(fcoe_netdev(lport), "fcoe_shost_config: " |
| "error on scsi_add_host\n"); |
| return rc; |
| } |
| |
| if (!lport->vport) |
| fc_host_max_npiv_vports(lport->host) = USHRT_MAX; |
| |
| snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE, |
| "%s v%s over %s", FCOE_NAME, FCOE_VERSION, |
| fcoe_netdev(lport)->name); |
| |
| return 0; |
| } |
| |
| /** |
| * fcoe_oem_match() - The match routine for the offloaded exchange manager |
| * @fp: The I/O frame |
| * |
| * This routine will be associated with an exchange manager (EM). When |
| * the libfc exchange handling code is looking for an EM to use it will |
| * call this routine and pass it the frame that it wishes to send. This |
| * routine will return True if the associated EM is to be used and False |
| * if the echange code should continue looking for an EM. |
| * |
| * The offload EM that this routine is associated with will handle any |
| * packets that are for SCSI read requests. |
| * |
| * Returns: True for read types I/O, otherwise returns false. |
| */ |
| bool fcoe_oem_match(struct fc_frame *fp) |
| { |
| return fc_fcp_is_read(fr_fsp(fp)) && |
| (fr_fsp(fp)->data_len > fcoe_ddp_min); |
| } |
| |
| /** |
| * fcoe_em_config() - Allocate and configure an exchange manager |
| * @lport: The local port that the new EM will be associated with |
| * |
| * Returns: 0 on success |
| */ |
| static inline int fcoe_em_config(struct fc_lport *lport) |
| { |
| struct fcoe_port *port = lport_priv(lport); |
| struct fcoe_interface *fcoe = port->priv; |
| 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) |
| { |
| /* 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); |
| |
| /* Destroy lport scsi_priv */ |
| fc_fcp_destroy(lport); |
| |
| /* 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_target() - Call a LLD's ddp_target 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_target(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_target) |
| return netdev->netdev_ops->ndo_fcoe_ddp_target(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, *n_port; |
| 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(*port)); |
| else |
| lport = libfc_vport_create(vport, sizeof(*port)); |
| |
| if (!lport) { |
| FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n"); |
| rc = -ENOMEM; |
| goto out; |
| } |
| port = lport_priv(lport); |
| port->lport = lport; |
| port->priv = fcoe; |
| port->max_queue_depth = FCOE_MAX_QUEUE_DEPTH; |
| port->min_queue_depth = FCOE_MIN_QUEUE_DEPTH; |
| INIT_WORK(&port->destroy_work, fcoe_destroy_work); |
| |
| /* configure a fc_lport including the exchange manager */ |
| rc = fcoe_lport_config(lport); |
| if (rc) { |
| FCOE_NETDEV_DBG(netdev, "Could not configure lport for the " |
| "interface\n"); |
| goto out_host_put; |
| } |
| |
| if (npiv) { |
| FCOE_NETDEV_DBG(netdev, "Setting vport names, " |
| "%16.16llx %16.16llx\n", |
| vport->node_name, vport->port_name); |
| fc_set_wwnn(lport, vport->node_name); |
| fc_set_wwpn(lport, vport->port_name); |
| } |
| |
| /* configure lport network properties */ |
| rc = fcoe_netdev_config(lport, netdev); |
| if (rc) { |
| FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the " |
| "interface\n"); |
| goto out_lp_destroy; |
| } |
| |
| /* configure lport scsi host properties */ |
| rc = fcoe_shost_config(lport, parent); |
| if (rc) { |
| FCOE_NETDEV_DBG(netdev, "Could not configure shost for the " |
| "interface\n"); |
| goto out_lp_destroy; |
| } |
| |
| /* Initialize the library */ |
| rc = fcoe_libfc_config(lport, &fcoe->ctlr, &fcoe_libfc_fcn_templ, 1); |
| if (rc) { |
| FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the " |
| "interface\n"); |
| goto out_lp_destroy; |
| } |
| |
| /* |
| * 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. |
| */ |
| if (!npiv) |
| /* lport exch manager allocation */ |
| rc = fcoe_em_config(lport); |
| else { |
| shost = vport_to_shost(vport); |
| n_port = shost_priv(shost); |
| rc = fc_exch_mgr_list_clone(n_port, lport); |
| } |
| |
| if (rc) { |
| FCOE_NETDEV_DBG(netdev, "Could not configure the EM\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_nport_scsi_transport = |
| fc_attach_transport(&fcoe_nport_fc_functions); |
| fcoe_vport_scsi_transport = |
| fc_attach_transport(&fcoe_vport_fc_functions); |
| |
| if (!fcoe_nport_scsi_transport) { |
| 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_nport_scsi_transport); |
| fc_release_transport(fcoe_vport_scsi_transport); |
| fcoe_nport_scsi_transport = NULL; |
| fcoe_vport_scsi_transport = NULL; |
| return 0; |
| } |
| |
| /** |
| * fcoe_percpu_thread_create() - Create a receive thread for an online CPU |
| * @cpu: The CPU index of the CPU to create a receive thread for |
| */ |
| static void fcoe_percpu_thread_create(unsigned int cpu) |
| { |
| struct fcoe_percpu_s *p; |
| struct task_struct *thread; |
| |
| p = &per_cpu(fcoe_percpu, cpu); |
| |
| thread = kthread_create(fcoe_percpu_receive_thread, |
| (void *)p, "fcoethread/%d", cpu); |
| |
| if (likely(!IS_ERR(thread))) { |
| kthread_bind(thread, cpu); |
| wake_up_process(thread); |
| |
| spin_lock_bh(&p->fcoe_rx_list.lock); |
| p->thread = thread; |
| spin_unlock_bh(&p->fcoe_rx_list.lock); |
| } |
| } |
| |
| /** |
| * fcoe_percpu_thread_destroy() - Remove the receive thread of a CPU |
| * @cpu: The CPU index of the CPU whose receive thread is to be destroyed |
| * |
| * Destroys a per-CPU Rx thread. Any pending skbs are moved to the |
| * current CPU's Rx thread. If the thread being destroyed is bound to |
| * the CPU processing this context the skbs will be freed. |
| */ |
| static void fcoe_percpu_thread_destroy(unsigned int cpu) |
| { |
| struct fcoe_percpu_s *p; |
| struct task_struct *thread; |
| struct page *crc_eof; |
| struct sk_buff *skb; |
| #ifdef CONFIG_SMP |
| struct fcoe_percpu_s *p0; |
| unsigned targ_cpu = get_cpu(); |
| #endif /* CONFIG_SMP */ |
| |
| FCOE_DBG("Destroying receive thread for CPU %d\n", cpu); |
| |
| /* Prevent any new skbs from being queued for this CPU. */ |
| p = &per_cpu(fcoe_percpu, cpu); |
| spin_lock_bh(&p->fcoe_rx_list.lock); |
| thread = p->thread; |
| p->thread = NULL; |
| crc_eof = p->crc_eof_page; |
| p->crc_eof_page = NULL; |
| p->crc_eof_offset = 0; |
| spin_unlock_bh(&p->fcoe_rx_list.lock); |
| |
| #ifdef CONFIG_SMP |
| /* |
| * Don't bother moving the skb's if this context is running |
| * on the same CPU that is having its thread destroyed. This |
| * can easily happen when the module is removed. |
| */ |
| if (cpu != targ_cpu) { |
| p0 = &per_cpu(fcoe_percpu, targ_cpu); |
| spin_lock_bh(&p0->fcoe_rx_list.lock); |
| if (p0->thread) { |
| FCOE_DBG("Moving frames from CPU %d to CPU %d\n", |
| cpu, targ_cpu); |
| |
| while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) |
| __skb_queue_tail(&p0->fcoe_rx_list, skb); |
| spin_unlock_bh(&p0->fcoe_rx_list.lock); |
| } else { |
| /* |
| * The targeted CPU is not initialized and cannot accept |
| * new skbs. Unlock the targeted CPU and drop the skbs |
| * on the CPU that is going offline. |
| */ |
| while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) |
| kfree_skb(skb); |
| spin_unlock_bh(&p0->fcoe_rx_list.lock); |
| } |
| } else { |
| /* |
| * This scenario occurs when the module is being removed |
| * and all threads are being destroyed. skbs will continue |
| * to be shifted from the CPU thread that is being removed |
| * to the CPU thread associated with the CPU that is processing |
| * the module removal. Once there is only one CPU Rx thread it |
| * will reach this case and we will drop all skbs and later |
| * stop the thread. |
| */ |
| spin_lock_bh(&p->fcoe_rx_list.lock); |
| while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) |
| kfree_skb(skb); |
| spin_unlock_bh(&p->fcoe_rx_list.lock); |
| } |
| put_cpu(); |
| #else |
| /* |
| * This a non-SMP scenario where the singular Rx thread is |
| * being removed. Free all skbs and stop the thread. |
| */ |
| spin_lock_bh(&p->fcoe_rx_list.lock); |
| while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) |
| kfree_skb(skb); |
| spin_unlock_bh(&p->fcoe_rx_list.lock); |
| #endif |
| |
| if (thread) |
| kthread_stop(thread); |
| |
| if (crc_eof) |
| put_page(crc_eof); |
| } |
| |
| /** |
| * fcoe_cpu_callback() - Handler for CPU hotplug events |
| * @nfb: The callback data block |
| * @action: The event triggering the callback |
| * @hcpu: The index of the CPU that the event is for |
| * |
| * This creates or destroys per-CPU data for fcoe |
| * |
| * Returns NOTIFY_OK always. |
| */ |
| static int fcoe_cpu_callback(struct notifier_block *nfb, |
| unsigned long action, void *hcpu) |
| { |
| unsigned cpu = (unsigned long)hcpu; |
| |
| switch (action) { |
| case CPU_ONLINE: |
| case CPU_ONLINE_FROZEN: |
| FCOE_DBG("CPU %x online: Create Rx thread\n", cpu); |
| fcoe_percpu_thread_create(cpu); |
| break; |
| case CPU_DEAD: |
| case CPU_DEAD_FROZEN: |
| FCOE_DBG("CPU %x offline: Remove Rx thread\n", cpu); |
| fcoe_percpu_thread_destroy(cpu); |
| break; |
| default: |
| break; |
| } |
| return NOTIFY_OK; |
| } |
| |
| /** |
| * fcoe_rcv() - Receive packets from a net device |
| * @skb: The received packet |
| * @netdev: The net device that the packet was received on |
| * @ptype: The packet type context |
| * @olddev: The last device net device |
| * |
| * This routine is called by NET_RX_SOFTIRQ. It receives a packet, builds a |
| * FC frame and passes the frame to libfc. |
| * |
| * Returns: 0 for success |
| */ |
| int fcoe_rcv(struct sk_buff *skb, struct net_device *netdev, |
| struct packet_type *ptype, struct net_device *olddev) |
| { |
| struct fc_lport *lport; |
| struct fcoe_rcv_info *fr; |
| struct fcoe_interface *fcoe; |
| struct fc_frame_header *fh; |
| struct fcoe_percpu_s *fps; |
| struct ethhdr *eh; |
| unsigned int cpu; |
| |
| fcoe = container_of(ptype, struct fcoe_interface, fcoe_packet_type); |
| lport = fcoe->ctlr.lp; |
| if (unlikely(!lport)) { |
| FCOE_NETDEV_DBG(netdev, "Cannot find hba structure"); |
| goto err2; |
| } |
| if (!lport->link_up) |
| goto err2; |
| |
| FCOE_NETDEV_DBG(netdev, "skb_info: len:%d data_len:%d head:%p " |
| "data:%p tail:%p end:%p sum:%d dev:%s", |
| skb->len, skb->data_len, skb->head, skb->data, |
| skb_tail_pointer(skb), skb_end_pointer(skb), |
| skb->csum, skb->dev ? skb->dev->name : "<NULL>"); |
| |
| eh = eth_hdr(skb); |
| |
| if (is_fip_mode(&fcoe->ctlr) && |
| compare_ether_addr(eh->h_source, fcoe->ctlr.dest_addr)) { |
| FCOE_NETDEV_DBG(netdev, "wrong source mac address:%pM\n", |
| eh->h_source); |
| goto err; |
| } |
| |
| /* |
| * Check for minimum frame length, and make sure required FCoE |
| * and FC headers are pulled into the linear data area. |
| */ |
| if (unlikely((skb->len < FCOE_MIN_FRAME) || |
| !pskb_may_pull(skb, FCOE_HEADER_LEN))) |
| goto err; |
| |
| skb_set_transport_header(skb, sizeof(struct fcoe_hdr)); |
| fh = (struct fc_frame_header *) skb_transport_header(skb); |
| |
| if (ntoh24(&eh->h_dest[3]) != ntoh24(fh->fh_d_id)) { |
| FCOE_NETDEV_DBG(netdev, "FC frame d_id mismatch with MAC:%pM\n", |
| eh->h_dest); |
| goto err; |
| } |
| |
| fr = fcoe_dev_from_skb(skb); |
| fr->fr_dev = lport; |
| fr->ptype = ptype; |
| |
| /* |
| * In case the incoming frame's exchange is originated from |
| * the initiator, then received frame's exchange id is ANDed |
| * with fc_cpu_mask bits to get the same cpu on which exchange |
| * was originated, otherwise just use the current cpu. |
| */ |
| if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX) |
| cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask; |
| else |
| cpu = smp_processor_id(); |
| |
| fps = &per_cpu(fcoe_percpu, cpu); |
| spin_lock_bh(&fps->fcoe_rx_list.lock); |
| if (unlikely(!fps->thread)) { |
| /* |
| * The targeted CPU is not ready, let's target |
| * the first CPU now. For non-SMP systems this |
| * will check the same CPU twice. |
| */ |
| FCOE_NETDEV_DBG(netdev, "CPU is online, but no receive thread " |
| "ready for incoming skb- using first online " |
| "CPU.\n"); |
| |
| spin_unlock_bh(&fps->fcoe_rx_list.lock); |
| cpu = cpumask_first(cpu_online_mask); |
| fps = &per_cpu(fcoe_percpu, cpu); |
| spin_lock_bh(&fps->fcoe_rx_list.lock); |
| if (!fps->thread) { |
| spin_unlock_bh(&fps->fcoe_rx_list.lock); |
| goto err; |
| } |
| } |
| |
| /* |
| * We now have a valid CPU that we're targeting for |
| * this skb. We also have this receive thread locked, |
| * so we're free to queue skbs into it's queue. |
| */ |
| |
| /* If this is a SCSI-FCP frame, and this is already executing on the |
| * correct CPU, and the queue for this CPU is empty, then go ahead |
| * and process the frame directly in the softirq context. |
| * This lets us process completions without context switching from the |
| * NET_RX softirq, to our receive processing thread, and then back to |
| * BLOCK softirq context. |
| */ |
| if (fh->fh_type == FC_TYPE_FCP && |
| cpu == smp_processor_id() && |
| skb_queue_empty(&fps->fcoe_rx_list)) { |
| spin_unlock_bh(&fps->fcoe_rx_list.lock); |
| fcoe_recv_frame(skb); |
| } else { |
| __skb_queue_tail(&fps->fcoe_rx_list, skb); |
| if (fps->fcoe_rx_list.qlen == 1) |
| wake_up_process(fps->thread); |
| spin_unlock_bh(&fps->fcoe_rx_list.lock); |
| } |
| |
| return 0; |
| err: |
| per_cpu_ptr(lport->dev_stats, get_cpu())->ErrorFrames++; |
| put_cpu(); |
| err2: |
| kfree_skb(skb); |
| return -1; |
| } |
| |
| /** |
| * fcoe_alloc_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 |
| * |
| * Returns: 0 for success |
| */ |
| static int fcoe_alloc_paged_crc_eof(struct sk_buff *skb, int tlen) |
| { |
| struct fcoe_percpu_s *fps; |
| int rc; |
| |
| fps = &get_cpu_var(fcoe_percpu); |
| rc = fcoe_get_paged_crc_eof(skb, tlen, fps); |
| put_cpu_var(fcoe_percpu); |
| |
| return rc; |
| } |
| |
| /** |
| * 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->priv; |
| u8 sof, eof; |
| struct fcoe_hdr *hp; |
| |
| WARN_ON((fr_len(fp) % sizeof(u32)) != 0); |
| |
| fh = fc_frame_header_get(fp); |
| skb = fp_skb(fp); |
| wlen = skb->len / FCOE_WORD_TO_BYTE; |
| |
| if (!lport->link_up) { |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| if (unlikely(fh->fh_type == FC_TYPE_ELS) && |
| fcoe_ctlr_els_send(&fcoe->ctlr, lport, skb)) |
| return 0; |
| |
| sof = fr_sof(fp); |
| eof = fr_eof(fp); |
| |
| elen = sizeof(struct ethhdr); |
| hlen = sizeof(struct fcoe_hdr); |
| tlen = sizeof(struct fcoe_crc_eof); |
| wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE; |
| |
| /* crc offload */ |
| if (likely(lport->crc_offload)) { |
| skb->ip_summed = CHECKSUM_PARTIAL; |
| skb->csum_start = skb_headroom(skb); |
| skb->csum_offset = skb->len; |
| crc = 0; |
| } else { |
| skb->ip_summed = CHECKSUM_NONE; |
| crc = fcoe_fc_crc(fp); |
| } |
| |
| /* copy port crc and eof to the skb buff */ |
| if (skb_is_nonlinear(skb)) { |
| skb_frag_t *frag; |
| if (fcoe_alloc_paged_crc_eof(skb, tlen)) { |
| kfree_skb(skb); |
| return -ENOMEM; |
| } |
| frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1]; |
| cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ) |
| + frag->page_offset; |
| } else { |
| cp = (struct fcoe_crc_eof *)skb_put(skb, tlen); |
| } |
| |
| memset(cp, 0, sizeof(*cp)); |
| cp->fcoe_eof = eof; |
| cp->fcoe_crc32 = cpu_to_le32(~crc); |
| |
| if (skb_is_nonlinear(skb)) { |
| kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ); |
| cp = NULL; |
| } |
| |
| /* adjust skb network/transport offsets to match mac/fcoe/port */ |
| skb_push(skb, elen + hlen); |
| skb_reset_mac_header(skb); |
| skb_reset_network_header(skb); |
| skb->mac_len = elen; |
| skb->protocol = htons(ETH_P_FCOE); |
| skb->dev = fcoe->netdev; |
| |
| /* fill up mac and fcoe headers */ |
| eh = eth_hdr(skb); |
| eh->h_proto = htons(ETH_P_FCOE); |
| memcpy(eh->h_dest, fcoe->ctlr.dest_addr, ETH_ALEN); |
| if (fcoe->ctlr.map_dest) |
| memcpy(eh->h_dest + 3, fh->fh_d_id, 3); |
| |
| if (unlikely(fcoe->ctlr.flogi_oxid != FC_XID_UNKNOWN)) |
| memcpy(eh->h_source, fcoe->ctlr.ctl_src_addr, ETH_ALEN); |
| else |
| memcpy(eh->h_source, port->data_src_addr, ETH_ALEN); |
| |
| hp = (struct fcoe_hdr *)(eh + 1); |
| memset(hp, 0, sizeof(*hp)); |
| if (FC_FCOE_VER) |
| FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER); |
| hp->fcoe_sof = sof; |
| |
| /* fcoe lso, mss is in max_payload which is non-zero for FCP data */ |
| if (lport->seq_offload && fr_max_payload(fp)) { |
| skb_shinfo(skb)->gso_type = SKB_GSO_FCOE; |
| skb_shinfo(skb)->gso_size = fr_max_payload(fp); |
| } else { |
| skb_shinfo(skb)->gso_type = 0; |
| skb_shinfo(skb)->gso_size = 0; |
| } |
| /* update tx stats: regardless if LLD fails */ |
| stats = per_cpu_ptr(lport->dev_stats, get_cpu()); |
| stats->TxFrames++; |
| stats->TxWords += wlen; |
| put_cpu(); |
| |
| /* send down to lld */ |
| fr_dev(fp) = lport; |
| if (port->fcoe_pending_queue.qlen) |
| fcoe_check_wait_queue(lport, skb); |
| else if (fcoe_start_io(skb)) |
| fcoe_check_wait_queue(lport, skb); |
| |
| return 0; |
| } |
| |
| /** |
| * fcoe_percpu_flush_done() - Indicate per-CPU queue flush completion |
| * @skb: The completed skb (argument required by destructor) |
| */ |
| static void fcoe_percpu_flush_done(struct sk_buff *skb) |
| { |
| complete(&fcoe_flush_completion); |
| } |
| |
| /** |
| * fcoe_filter_frames() - filter out bad fcoe frames, i.e. bad CRC |
| * @lport: The local port the frame was received on |
| * @fp: The received frame |
| * |
| * Return: 0 on passing filtering checks |
| */ |
| static inline int fcoe_filter_frames(struct fc_lport *lport, |
| struct fc_frame *fp) |
| { |
| struct fcoe_interface *fcoe; |
| struct fc_frame_header *fh; |
| struct sk_buff *skb = (struct sk_buff *)fp; |
| struct fcoe_dev_stats *stats; |
| |
| /* |
| * 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 = (struct fc_frame_header *) skb_transport_header(skb); |
| fh = fc_frame_header_get(fp); |
| if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && fh->fh_type == FC_TYPE_FCP) |
| return 0; |
| |
| fcoe = ((struct fcoe_port *)lport_priv(lport))->priv; |
| if (is_fip_mode(&fcoe->ctlr) && fc_frame_payload_op(fp) == ELS_LOGO && |
| ntoh24(fh->fh_s_id) == FC_FID_FLOGI) { |
| FCOE_DBG("fcoe: dropping FCoE lport LOGO in fip mode\n"); |
| return -EINVAL; |
| } |
| |
| if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED) || |
| le32_to_cpu(fr_crc(fp)) == ~crc32(~0, skb->data, skb->len)) { |
| fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; |
| return 0; |
| } |
| |
| stats = per_cpu_ptr(lport->dev_stats, get_cpu()); |
| stats->InvalidCRCCount++; |
| if (stats->InvalidCRCCount < 5) |
| printk(KERN_WARNING "fcoe: dropping frame with CRC error\n"); |
| return -EINVAL; |
| } |
| |
| /** |
| * 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 fcoe_crc_eof crc_eof; |
| struct fc_frame *fp; |
| struct fcoe_port *port; |
| struct fcoe_hdr *hp; |
| |
| fr = fcoe_dev_from_skb(skb); |
| lport = fr->fr_dev; |
| if (unlikely(!lport)) { |
| if (skb->destructor != fcoe_percpu_flush_done) |
| FCOE_NETDEV_DBG(skb->dev, "NULL lport in skb"); |
| kfree_skb(skb); |
| return; |
| } |
| |
| FCOE_NETDEV_DBG(skb->dev, "skb_info: len:%d data_len:%d " |
| "head:%p data:%p tail:%p end:%p sum:%d dev:%s", |
| skb->len, skb->data_len, |
| skb->head, skb->data, skb_tail_pointer(skb), |
| skb_end_pointer(skb), skb->csum, |
| skb->dev ? skb->dev->name : "<NULL>"); |
| |
| port = lport_priv(lport); |
| if (skb_is_nonlinear(skb)) |
| skb_linearize(skb); /* not ideal */ |
| |
| /* |
| * Frame length checks and setting up the header pointers |
| * was done in fcoe_rcv already. |
| */ |
| hp = (struct fcoe_hdr *) skb_network_header(skb); |
| |
| stats = per_cpu_ptr(lport->dev_stats, get_cpu()); |
| if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) { |
| if (stats->ErrorFrames < 5) |
| printk(KERN_WARNING "fcoe: FCoE version " |
| "mismatch: The frame has " |
| "version %x, but the " |
| "initiator supports version " |
| "%x\n", FC_FCOE_DECAPS_VER(hp), |
| FC_FCOE_VER); |
| goto drop; |
| } |
| |
| skb_pull(skb, sizeof(struct fcoe_hdr)); |
| fr_len = skb->len - sizeof(struct fcoe_crc_eof); |
| |
| stats->RxFrames++; |
| stats->RxWords += fr_len / FCOE_WORD_TO_BYTE; |
| |
| fp = (struct fc_frame *)skb; |
| fc_frame_init(fp); |
| fr_dev(fp) = lport; |
| fr_sof(fp) = hp->fcoe_sof; |
| |
| /* Copy out the CRC and EOF trailer for access */ |
| if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) |
| goto drop; |
| fr_eof(fp) = crc_eof.fcoe_eof; |
| fr_crc(fp) = crc_eof.fcoe_crc32; |
| if (pskb_trim(skb, fr_len)) |
| goto drop; |
| |
| if (!fcoe_filter_frames(lport, fp)) { |
| put_cpu(); |
| fc_exch_recv(lport, fp); |
| return; |
| } |
| drop: |
| stats->ErrorFrames++; |
| put_cpu(); |
| kfree_skb(skb); |
| } |
| |
| /** |
| * fcoe_percpu_receive_thread() - The per-CPU packet receive thread |
| * @arg: The per-CPU context |
| * |
| * Return: 0 for success |
| */ |
| int fcoe_percpu_receive_thread(void *arg) |
| { |
| struct fcoe_percpu_s *p = arg; |
| struct sk_buff *skb; |
| |
| set_user_nice(current, -20); |
| |
| while (!kthread_should_stop()) { |
| |
| spin_lock_bh(&p->fcoe_rx_list.lock); |
| while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) { |
| set_current_state(TASK_INTERRUPTIBLE); |
| spin_unlock_bh(&p->fcoe_rx_list.lock); |
| schedule(); |
| set_current_state(TASK_RUNNING); |
| if (kthread_should_stop()) |
| return 0; |
| spin_lock_bh(&p->fcoe_rx_list.lock); |
| } |
| spin_unlock_bh(&p->fcoe_rx_list.lock); |
| fcoe_recv_frame(skb); |
| } |
| return 0; |
| } |
| |
| /** |
| * fcoe_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); |
| queue_work(fcoe_wq, &port->destroy_work); |
| goto out; |
| break; |
| case NETDEV_FEAT_CHANGE: |
| fcoe_netdev_features_change(lport, netdev); |
| break; |
| default: |
| FCOE_NETDEV_DBG(netdev, "Unknown event %ld " |
| "from netdev netlink\n", event); |
| } |
| |
| fcoe_link_speed_update(lport); |
| |
| if (link_possible && !fcoe_link_ok(lport)) |
| fcoe_ctlr_link_up(&fcoe->ctlr); |
| else if (fcoe_ctlr_link_down(&fcoe->ctlr)) { |
| stats = per_cpu_ptr(lport->dev_stats, get_cpu()); |
| stats->LinkFailureCount++; |
| put_cpu(); |
| fcoe_clean_pending_queue(lport); |
| } |
| out: |
| return rc; |
| } |
| |
| /** |
| * fcoe_disable() - Disables a FCoE interface |
| * @netdev : The net_device object the Ethernet interface to create on |
| * |
| * Called from fcoe transport. |
| * |
| * Returns: 0 for success |
| */ |
| static int fcoe_disable(struct net_device *netdev) |
| { |
| struct fcoe_interface *fcoe; |
| int rc = 0; |
| |
| mutex_lock(&fcoe_config_mutex); |
| |
| rtnl_lock(); |
| fcoe = fcoe_hostlist_lookup_port(netdev); |
| rtnl_unlock(); |
| |
| if (fcoe) { |
| fcoe_ctlr_link_down(&fcoe->ctlr); |
| fcoe_clean_pending_queue(fcoe->ctlr.lp); |
| } else |
| rc = -ENODEV; |
| |
| mutex_unlock(&fcoe_config_mutex); |
| return rc; |
| } |
| |
| /** |
| * fcoe_enable() - Enables a FCoE interface |
| * @netdev : The net_device object the Ethernet interface to create on |
| * |
| * Called from fcoe transport. |
| * |
| * Returns: 0 for success |
| */ |
| static int fcoe_enable(struct net_device *netdev) |
| { |
| struct fcoe_interface *fcoe; |
| int rc = 0; |
| |
| mutex_lock(&fcoe_config_mutex); |
| rtnl_lock(); |
| fcoe = fcoe_hostlist_lookup_port(netdev); |
| rtnl_unlock(); |
| |
| if (!fcoe) |
| rc = -ENODEV; |
| else if (!fcoe_link_ok(fcoe->ctlr.lp)) |
| fcoe_ctlr_link_up(&fcoe->ctlr); |
| |
| mutex_unlock(&fcoe_config_mutex); |
| return rc; |
| } |
| |
| /** |
| * fcoe_destroy() - Destroy a FCoE interface |
| * @netdev : The net_device object the Ethernet interface to create on |
| * |
| * Called from fcoe transport |
| * |
| * Returns: 0 for success |
| */ |
| static int fcoe_destroy(struct net_device *netdev) |
| { |
| struct fcoe_interface *fcoe; |
| struct fc_lport *lport; |
| int rc = 0; |
| |
| mutex_lock(&fcoe_config_mutex); |
| rtnl_lock(); |
| fcoe = fcoe_hostlist_lookup_port(netdev); |
| if (!fcoe) { |
| rtnl_unlock(); |
| rc = -ENODEV; |
| goto out_nodev; |
| } |
| lport = fcoe->ctlr.lp; |
| list_del(&fcoe->list); |
| fcoe_interface_cleanup(fcoe); |
| rtnl_unlock(); |
| fcoe_if_destroy(lport); |
| 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_match() - Check if the FCoE is supported on the given netdevice |
| * @netdev : The net_device object the Ethernet interface to create on |
| * |
| * Called from fcoe transport. |
| * |
| * Returns: always returns true as this is the default FCoE transport, |
| * i.e., support all netdevs. |
| */ |
| static bool fcoe_match(struct net_device *netdev) |
| { |
| return true; |
| } |
| |
| /** |
| * fcoe_create() - Create a fcoe interface |
| * @netdev : The net_device object the Ethernet interface to create on |
| * @fip_mode: The FIP mode for this creation |
| * |
| * Called from fcoe transport |
| * |
| * Returns: 0 for success |
| */ |
| static int fcoe_create(struct net_device *netdev, enum fip_state fip_mode) |
| { |
| int rc; |
| struct fcoe_interface *fcoe; |
| struct fc_lport *lport; |
| |
| mutex_lock(&fcoe_config_mutex); |
| rtnl_lock(); |
| |
| /* look for existing lport */ |
| if (fcoe_hostlist_lookup(netdev)) { |
| rc = -EEXIST; |
| goto out_nodev; |
| } |
| |
| fcoe = fcoe_interface_create(netdev, fip_mode); |
| if (IS_ERR(fcoe)) { |
| rc = PTR_ERR(fcoe); |
| goto out_nodev; |
| } |
| |
| 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); |
| rtnl_unlock(); |
| mutex_unlock(&fcoe_config_mutex); |
| |
| return 0; |
| out_free: |
| fcoe_interface_put(fcoe); |
| out_nodev: |
| rtnl_unlock(); |
| mutex_unlock(&fcoe_config_mutex); |
| return rc; |
| } |
| |
| /** |
| * fcoe_link_speed_update() - Update the supported and actual link speeds |
| * @lport: The local port to update speeds for |
| * |
| * Returns: 0 if the ethtool query was successful |
| * -1 if the ethtool query failed |
| */ |
| int fcoe_link_speed_update(struct fc_lport *lport) |
| { |
| struct net_device *netdev = fcoe_netdev(lport); |
| struct ethtool_cmd ecmd; |
| |
| if (!dev_ethtool_get_settings(netdev, &ecmd)) { |
| lport->link_supported_speeds &= |
| ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT); |
| if (ecmd.supported & (SUPPORTED_1000baseT_Half | |
| SUPPORTED_1000baseT_Full)) |
| lport->link_supported_speeds |= FC_PORTSPEED_1GBIT; |
| if (ecmd.supported & SUPPORTED_10000baseT_Full) |
| lport->link_supported_speeds |= |
| FC_PORTSPEED_10GBIT; |
| switch (ethtool_cmd_speed(&ecmd)) { |
| case SPEED_1000: |
| lport->link_speed = FC_PORTSPEED_1GBIT; |
| break; |
| case SPEED_10000: |
| lport->link_speed = FC_PORTSPEED_10GBIT; |
| break; |
| } |
| return 0; |
| } |
| return -1; |
| } |
| |
| /** |
| * fcoe_link_ok() - Check if the link is OK for a local port |
| * @lport: The local port to check link on |
| * |
| * Returns: 0 if link is UP and OK, -1 if not |
| * |
| */ |
| int fcoe_link_ok(struct fc_lport *lport) |
| { |
| struct net_device *netdev = fcoe_netdev(lport); |
| |
| if (netif_oper_up(netdev)) |
| return 0; |
| return -1; |
| } |
| |
| /** |
| * fcoe_percpu_clean() - Clear all pending skbs for an local port |
| * @lport: The local port whose skbs are to be cleared |
| * |
| * Must be called with fcoe_create_mutex held to single-thread completion. |
| * |
| * This flushes the pending skbs by adding a new skb to each queue and |
| * waiting until they are all freed. This assures us that not only are |
| * there no packets that will be handled by the lport, but also that any |
| * threads already handling packet have returned. |
| */ |
| void fcoe_percpu_clean(struct fc_lport *lport) |
| { |
| struct fcoe_percpu_s *pp; |
| struct fcoe_rcv_info *fr; |
| struct sk_buff_head *list; |
| struct sk_buff *skb, *next; |
| struct sk_buff *head; |
| unsigned int cpu; |
| |
| for_each_possible_cpu(cpu) { |
| pp = &per_cpu(fcoe_percpu, cpu); |
| spin_lock_bh(&pp->fcoe_rx_list.lock); |
| list = &pp->fcoe_rx_list; |
| head = list->next; |
| for (skb = head; skb != (struct sk_buff *)list; |
| skb = next) { |
| next = skb->next; |
| fr = fcoe_dev_from_skb(skb); |
| if (fr->fr_dev == lport) { |
| __skb_unlink(skb, list); |
| kfree_skb(skb); |
| } |
| } |
| |
| if (!pp->thread || !cpu_online(cpu)) { |
| spin_unlock_bh(&pp->fcoe_rx_list.lock); |
| continue; |
| } |
| |
| skb = dev_alloc_skb(0); |
| if (!skb) { |
| spin_unlock_bh(&pp->fcoe_rx_list.lock); |
| continue; |
| } |
| skb->destructor = fcoe_percpu_flush_done; |
| |
| __skb_queue_tail(&pp->fcoe_rx_list, skb); |
| if (pp->fcoe_rx_list.qlen == 1) |
| wake_up_process(pp->thread); |
| spin_unlock_bh(&pp->fcoe_rx_list.lock); |
| |
| wait_for_completion(&fcoe_flush_completion); |
| } |
| } |
| |
| /** |
| * fcoe_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); |
| struct fcoe_port *port = lport_priv(lport); |
| struct fcoe_interface *fcoe = port->priv; |
| |
| fcoe_ctlr_link_down(&fcoe->ctlr); |
| fcoe_clean_pending_queue(fcoe->ctlr.lp); |
| if (!fcoe_link_ok(fcoe->ctlr.lp)) |
| fcoe_ctlr_link_up(&fcoe->ctlr); |
| 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->priv; |
| list_add_tail(&fcoe->list, &fcoe_hostlist); |
| } |
| return 0; |
| } |
| |
| |
| static struct fcoe_transport fcoe_sw_transport = { |
| .name = {FCOE_TRANSPORT_DEFAULT}, |
| .attached = false, |
| .list = LIST_HEAD_INIT(fcoe_sw_transport.list), |
| .match = fcoe_match, |
| .create = fcoe_create, |
| .destroy = fcoe_destroy, |
| .enable = fcoe_enable, |
| .disable = fcoe_disable, |
| }; |
| |
| /** |
| * 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; |
| |
| fcoe_wq = alloc_workqueue("fcoe", 0, 0); |
| if (!fcoe_wq) |
| return -ENOMEM; |
| |
| /* register as a fcoe transport */ |
| rc = fcoe_transport_attach(&fcoe_sw_transport); |
| if (rc) { |
| printk(KERN_ERR "failed to register an fcoe transport, check " |
| "if libfcoe is loaded\n"); |
| return rc; |
| } |
| |
| 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); |
| destroy_workqueue(fcoe_wq); |
| 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); |
| queue_work(fcoe_wq, &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); |
| |
| /* |
| * destroy_work's may be chained but destroy_workqueue() |
| * can take care of them. Just kill the fcoe_wq. |
| */ |
| destroy_workqueue(fcoe_wq); |
| |
| /* |
| * Detaching from the scsi transport must happen after all |
| * destroys are done on the fcoe_wq. destroy_workqueue will |
| * enusre the fcoe_wq is flushed. |
| */ |
| fcoe_if_exit(); |
| |
| /* detach from fcoe transport */ |
| fcoe_transport_detach(&fcoe_sw_transport); |
| } |
| module_exit(fcoe_exit); |
| |
| /** |
| * fcoe_flogi_resp() - FCoE specific FLOGI and FDISC response handler |
| * @seq: active sequence in the FLOGI or FDISC exchange |
| * @fp: response frame, or error encoded in a pointer (timeout) |
| * @arg: pointer the the fcoe_ctlr structure |
| * |
| * This handles MAC address management for FCoE, then passes control on to |
| * the libfc FLOGI response handler. |
| */ |
| static void fcoe_flogi_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) |
| { |
| struct fcoe_ctlr *fip = arg; |
| struct fc_exch *exch = fc_seq_exch(seq); |
| struct fc_lport *lport = exch->lp; |
| u8 *mac; |
| |
| if (IS_ERR(fp)) |
| goto done; |
| |
| mac = fr_cb(fp)->granted_mac; |
| if (is_zero_ether_addr(mac)) { |
| /* pre-FIP */ |
| if (fcoe_ctlr_recv_flogi(fip, lport, fp)) { |
| fc_frame_free(fp); |
| return; |
| } |
| } |
| fcoe_update_src_mac(lport, mac); |
| done: |
| fc_lport_flogi_resp(seq, fp, lport); |
| } |
| |
| /** |
| * fcoe_logo_resp() - FCoE specific LOGO response handler |
| * @seq: active sequence in the LOGO exchange |
| * @fp: response frame, or error encoded in a pointer (timeout) |
| * @arg: pointer the the fcoe_ctlr structure |
| * |
| * This handles MAC address management for FCoE, then passes control on to |
| * the libfc LOGO response handler. |
| */ |
| static void fcoe_logo_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) |
| { |
| struct fc_lport *lport = arg; |
| static u8 zero_mac[ETH_ALEN] = { 0 }; |
| |
| if (!IS_ERR(fp)) |
| fcoe_update_src_mac(lport, zero_mac); |
| fc_lport_logo_resp(seq, fp, lport); |
| } |
| |
| /** |
| * fcoe_elsct_send - FCoE specific ELS handler |
| * |
| * This does special case handling of FIP encapsualted ELS exchanges for FCoE, |
| * using FCoE specific response handlers and passing the FIP controller as |
| * the argument (the lport is still available from the exchange). |
| * |
| * Most of the work here is just handed off to the libfc routine. |
| */ |
| static struct fc_seq *fcoe_elsct_send(struct fc_lport *lport, u32 did, |
| struct fc_frame *fp, unsigned int op, |
| void (*resp)(struct fc_seq *, |
| struct fc_frame *, |
| void *), |
| void *arg, u32 timeout) |
| { |
| struct fcoe_port *port = lport_priv(lport); |
| struct fcoe_interface *fcoe = port->priv; |
| struct fcoe_ctlr *fip = &fcoe->ctlr; |
| struct fc_frame_header *fh = fc_frame_header_get(fp); |
| |
| switch (op) { |
| case ELS_FLOGI: |
| case ELS_FDISC: |
| if (lport->point_to_multipoint) |
| break; |
| return fc_elsct_send(lport, did, fp, op, fcoe_flogi_resp, |
| fip, timeout); |
| case ELS_LOGO: |
| /* only hook onto fabric logouts, not port logouts */ |
| if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI) |
| break; |
| return fc_elsct_send(lport, did, fp, op, fcoe_logo_resp, |
| lport, timeout); |
| } |
| return fc_elsct_send(lport, did, fp, op, resp, arg, timeout); |
| } |
| |
| /** |
| * fcoe_vport_create() - create an fc_host/scsi_host for a vport |
| * @vport: fc_vport object to create a new fc_host for |
| * @disabled: start the new fc_host in a disabled state by default? |
| * |
| * Returns: 0 for success |
| */ |
| static int fcoe_vport_create(struct fc_vport *vport, bool disabled) |
| { |
| struct Scsi_Host *shost = vport_to_shost(vport); |
| struct fc_lport *n_port = shost_priv(shost); |
| struct fcoe_port *port = lport_priv(n_port); |
| struct fcoe_interface *fcoe = port->priv; |
| struct net_device *netdev = fcoe->netdev; |
| struct fc_lport *vn_port; |
| int rc; |
| char buf[32]; |
| |
| rc = fcoe_validate_vport_create(vport); |
| if (rc) { |
| wwn_to_str(vport->port_name, buf, sizeof(buf)); |
| printk(KERN_ERR "fcoe: Failed to create vport, " |
| "WWPN (0x%s) already exists\n", |
| buf); |
| return rc; |
| } |
| |
| 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); |
| queue_work(fcoe_wq, &port->destroy_work); |
| return 0; |
| } |
| |
| /** |
| * fcoe_vport_disable() - change vport state |
| * @vport: vport to bring online/offline |
| * @disable: should the vport be disabled? |
| */ |
| static int fcoe_vport_disable(struct fc_vport *vport, bool disable) |
| { |
| struct fc_lport *lport = vport->dd_data; |
| |
| if (disable) { |
| fc_vport_set_state(vport, FC_VPORT_DISABLED); |
| fc_fabric_logoff(lport); |
| } else { |
| lport->boot_time = jiffies; |
| fc_fabric_login(lport); |
| fc_vport_setlink(lport); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * fcoe_vport_set_symbolic_name() - append vport string to symbolic name |
| * @vport: fc_vport with a new symbolic name string |
| * |
| * After generating a new symbolic name string, a new RSPN_ID request is |
| * sent to the name server. There is no response handler, so if it fails |
| * for some reason it will not be retried. |
| */ |
| static void fcoe_set_vport_symbolic_name(struct fc_vport *vport) |
| { |
| struct fc_lport *lport = vport->dd_data; |
| struct fc_frame *fp; |
| size_t len; |
| |
| snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE, |
| "%s v%s over %s : %s", FCOE_NAME, FCOE_VERSION, |
| fcoe_netdev(lport)->name, vport->symbolic_name); |
| |
| if (lport->state != LPORT_ST_READY) |
| return; |
| |
| len = strnlen(fc_host_symbolic_name(lport->host), 255); |
| fp = fc_frame_alloc(lport, |
| sizeof(struct fc_ct_hdr) + |
| sizeof(struct fc_ns_rspn) + len); |
| if (!fp) |
| return; |
| lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RSPN_ID, |
| NULL, NULL, 3 * lport->r_a_tov); |
| } |
| |
| /** |
| * fcoe_get_lesb() - Fill the FCoE Link Error Status Block |
| * @lport: the local port |
| * @fc_lesb: the link error status block |
| */ |
| static void fcoe_get_lesb(struct fc_lport *lport, |
| struct fc_els_lesb *fc_lesb) |
| { |
| unsigned int cpu; |
| u32 lfc, vlfc, mdac; |
| struct fcoe_dev_stats *devst; |
| struct fcoe_fc_els_lesb *lesb; |
| struct rtnl_link_stats64 temp; |
| struct net_device *netdev = fcoe_netdev(lport); |
| |
| lfc = 0; |
| vlfc = 0; |
| mdac = 0; |
| lesb = (struct fcoe_fc_els_lesb *)fc_lesb; |
| memset(lesb, 0, sizeof(*lesb)); |
| for_each_possible_cpu(cpu) { |
| devst = per_cpu_ptr(lport->dev_stats, cpu); |
| lfc += devst->LinkFailureCount; |
| vlfc += devst->VLinkFailureCount; |
| mdac += devst->MissDiscAdvCount; |
| } |
| lesb->lesb_link_fail = htonl(lfc); |
| lesb->lesb_vlink_fail = htonl(vlfc); |
| lesb->lesb_miss_fka = htonl(mdac); |
| lesb->lesb_fcs_error = htonl(dev_get_stats(netdev, &temp)->rx_crc_errors); |
| } |
| |
| /** |
| * fcoe_set_port_id() - Callback from libfc when Port_ID is set. |
| * @lport: the local port |
| * @port_id: the port ID |
| * @fp: the received frame, if any, that caused the port_id to be set. |
| * |
| * This routine handles the case where we received a FLOGI and are |
| * entering point-to-point mode. We need to call fcoe_ctlr_recv_flogi() |
| * so it can set the non-mapped mode and gateway address. |
| * |
| * The FLOGI LS_ACC is handled by fcoe_flogi_resp(). |
| */ |
| static void fcoe_set_port_id(struct fc_lport *lport, |
| u32 port_id, struct fc_frame *fp) |
| { |
| struct fcoe_port *port = lport_priv(lport); |
| struct fcoe_interface *fcoe = port->priv; |
| |
| if (fp && fc_frame_payload_op(fp) == ELS_FLOGI) |
| fcoe_ctlr_recv_flogi(&fcoe->ctlr, lport, fp); |
| } |
| |
| /** |
| * fcoe_validate_vport_create() - Validate a vport before creating it |
| * @vport: NPIV port to be created |
| * |
| * This routine is meant to add validation for a vport before creating it |
| * via fcoe_vport_create(). |
| * Current validations are: |
| * - WWPN supplied is unique for given lport |
| * |
| * |
| */ |
| static int fcoe_validate_vport_create(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; |
| int rc = 0; |
| char buf[32]; |
| |
| mutex_lock(&n_port->lp_mutex); |
| |
| wwn_to_str(vport->port_name, buf, sizeof(buf)); |
| /* Check if the wwpn is not same as that of the lport */ |
| if (!memcmp(&n_port->wwpn, &vport->port_name, sizeof(u64))) { |
| FCOE_DBG("vport WWPN 0x%s is same as that of the " |
| "base port WWPN\n", buf); |
| rc = -EINVAL; |
| goto out; |
| } |
| |
| /* Check if there is any existing vport with same wwpn */ |
| list_for_each_entry(vn_port, &n_port->vports, list) { |
| if (!memcmp(&vn_port->wwpn, &vport->port_name, sizeof(u64))) { |
| FCOE_DBG("vport with given WWPN 0x%s already " |
| "exists\n", buf); |
| rc = -EINVAL; |
| break; |
| } |
| } |
| |
| out: |
| mutex_unlock(&n_port->lp_mutex); |
| |
| return rc; |
| } |