Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms and conditions of the GNU General Public License, |
| 6 | * version 2, as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along with |
| 14 | * this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | * |
| 17 | * Maintained at www.Open-FCoE.org |
| 18 | */ |
| 19 | |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/version.h> |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 22 | #include <linux/spinlock.h> |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 23 | #include <linux/netdevice.h> |
| 24 | #include <linux/etherdevice.h> |
| 25 | #include <linux/ethtool.h> |
| 26 | #include <linux/if_ether.h> |
| 27 | #include <linux/if_vlan.h> |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 28 | #include <linux/crc32.h> |
| 29 | #include <linux/cpu.h> |
| 30 | #include <linux/fs.h> |
| 31 | #include <linux/sysfs.h> |
| 32 | #include <linux/ctype.h> |
| 33 | #include <scsi/scsi_tcq.h> |
| 34 | #include <scsi/scsicam.h> |
| 35 | #include <scsi/scsi_transport.h> |
| 36 | #include <scsi/scsi_transport_fc.h> |
| 37 | #include <net/rtnetlink.h> |
| 38 | |
| 39 | #include <scsi/fc/fc_encaps.h> |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 40 | #include <scsi/fc/fc_fip.h> |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 41 | |
| 42 | #include <scsi/libfc.h> |
| 43 | #include <scsi/fc_frame.h> |
| 44 | #include <scsi/libfcoe.h> |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 45 | |
Vasu Dev | fdd7802 | 2009-03-17 11:42:24 -0700 | [diff] [blame] | 46 | #include "fcoe.h" |
| 47 | |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 48 | static int debug_fcoe; |
| 49 | |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 50 | MODULE_AUTHOR("Open-FCoE.org"); |
| 51 | MODULE_DESCRIPTION("FCoE"); |
Vasu Dev | 9b34ecf | 2009-03-17 11:42:13 -0700 | [diff] [blame] | 52 | MODULE_LICENSE("GPL v2"); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 53 | |
| 54 | /* fcoe host list */ |
| 55 | LIST_HEAD(fcoe_hostlist); |
| 56 | DEFINE_RWLOCK(fcoe_hostlist_lock); |
Robert Love | 5e5e92d | 2009-03-17 11:41:35 -0700 | [diff] [blame] | 57 | DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 58 | |
Chris Leech | dd3fd72 | 2009-04-21 16:27:36 -0700 | [diff] [blame] | 59 | /* Function Prototypes */ |
Vasu Dev | fdd7802 | 2009-03-17 11:42:24 -0700 | [diff] [blame] | 60 | static int fcoe_reset(struct Scsi_Host *shost); |
| 61 | static int fcoe_xmit(struct fc_lport *, struct fc_frame *); |
| 62 | static int fcoe_rcv(struct sk_buff *, struct net_device *, |
| 63 | struct packet_type *, struct net_device *); |
| 64 | static int fcoe_percpu_receive_thread(void *arg); |
| 65 | static void fcoe_clean_pending_queue(struct fc_lport *lp); |
| 66 | static void fcoe_percpu_clean(struct fc_lport *lp); |
| 67 | static int fcoe_link_ok(struct fc_lport *lp); |
| 68 | |
| 69 | static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *); |
| 70 | static int fcoe_hostlist_add(const struct fc_lport *); |
| 71 | static int fcoe_hostlist_remove(const struct fc_lport *); |
| 72 | |
Vasu Dev | 4bb6b51 | 2009-05-06 10:52:34 -0700 | [diff] [blame] | 73 | static void fcoe_check_wait_queue(struct fc_lport *, struct sk_buff *); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 74 | static int fcoe_device_notification(struct notifier_block *, ulong, void *); |
| 75 | static void fcoe_dev_setup(void); |
| 76 | static void fcoe_dev_cleanup(void); |
| 77 | |
| 78 | /* notification function from net device */ |
| 79 | static struct notifier_block fcoe_notifier = { |
| 80 | .notifier_call = fcoe_device_notification, |
| 81 | }; |
| 82 | |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 83 | static struct scsi_transport_template *scsi_transport_fcoe_sw; |
| 84 | |
| 85 | struct fc_function_template fcoe_transport_function = { |
| 86 | .show_host_node_name = 1, |
| 87 | .show_host_port_name = 1, |
| 88 | .show_host_supported_classes = 1, |
| 89 | .show_host_supported_fc4s = 1, |
| 90 | .show_host_active_fc4s = 1, |
| 91 | .show_host_maxframe_size = 1, |
| 92 | |
| 93 | .show_host_port_id = 1, |
| 94 | .show_host_supported_speeds = 1, |
| 95 | .get_host_speed = fc_get_host_speed, |
| 96 | .show_host_speed = 1, |
| 97 | .show_host_port_type = 1, |
| 98 | .get_host_port_state = fc_get_host_port_state, |
| 99 | .show_host_port_state = 1, |
| 100 | .show_host_symbolic_name = 1, |
| 101 | |
| 102 | .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv), |
| 103 | .show_rport_maxframe_size = 1, |
| 104 | .show_rport_supported_classes = 1, |
| 105 | |
| 106 | .show_host_fabric_name = 1, |
| 107 | .show_starget_node_name = 1, |
| 108 | .show_starget_port_name = 1, |
| 109 | .show_starget_port_id = 1, |
| 110 | .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo, |
| 111 | .show_rport_dev_loss_tmo = 1, |
| 112 | .get_fc_host_stats = fc_get_host_stats, |
| 113 | .issue_fc_host_lip = fcoe_reset, |
| 114 | |
| 115 | .terminate_rport_io = fc_rport_terminate_io, |
| 116 | }; |
| 117 | |
| 118 | static struct scsi_host_template fcoe_shost_template = { |
| 119 | .module = THIS_MODULE, |
| 120 | .name = "FCoE Driver", |
| 121 | .proc_name = FCOE_NAME, |
| 122 | .queuecommand = fc_queuecommand, |
| 123 | .eh_abort_handler = fc_eh_abort, |
| 124 | .eh_device_reset_handler = fc_eh_device_reset, |
| 125 | .eh_host_reset_handler = fc_eh_host_reset, |
| 126 | .slave_alloc = fc_slave_alloc, |
| 127 | .change_queue_depth = fc_change_queue_depth, |
| 128 | .change_queue_type = fc_change_queue_type, |
| 129 | .this_id = -1, |
| 130 | .cmd_per_lun = 32, |
| 131 | .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS, |
| 132 | .use_clustering = ENABLE_CLUSTERING, |
| 133 | .sg_tablesize = SG_ALL, |
| 134 | .max_sectors = 0xffff, |
| 135 | }; |
| 136 | |
| 137 | /** |
| 138 | * fcoe_lport_config() - sets up the fc_lport |
| 139 | * @lp: ptr to the fc_lport |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 140 | * |
| 141 | * Returns: 0 for success |
| 142 | */ |
| 143 | static int fcoe_lport_config(struct fc_lport *lp) |
| 144 | { |
| 145 | lp->link_up = 0; |
| 146 | lp->qfull = 0; |
| 147 | lp->max_retry_count = 3; |
Abhijeet Joglekar | a366695 | 2009-05-01 10:01:26 -0700 | [diff] [blame] | 148 | lp->max_rport_retry_count = 3; |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 149 | lp->e_d_tov = 2 * 1000; /* FC-FS default */ |
| 150 | lp->r_a_tov = 2 * 2 * 1000; |
| 151 | lp->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS | |
| 152 | FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL); |
| 153 | |
| 154 | fc_lport_init_stats(lp); |
| 155 | |
| 156 | /* lport fc_lport related configuration */ |
| 157 | fc_lport_config(lp); |
| 158 | |
| 159 | /* offload related configuration */ |
| 160 | lp->crc_offload = 0; |
| 161 | lp->seq_offload = 0; |
| 162 | lp->lro_enabled = 0; |
| 163 | lp->lro_xid = 0; |
| 164 | lp->lso_max = 0; |
| 165 | |
| 166 | return 0; |
| 167 | } |
| 168 | |
| 169 | /** |
Vasu Dev | 1047f22 | 2009-05-06 10:52:40 -0700 | [diff] [blame] | 170 | * fcoe_queue_timer() - fcoe queue timer |
| 171 | * @lp: the fc_lport pointer |
| 172 | * |
| 173 | * Calls fcoe_check_wait_queue on timeout |
| 174 | * |
| 175 | */ |
| 176 | static void fcoe_queue_timer(ulong lp) |
| 177 | { |
| 178 | fcoe_check_wait_queue((struct fc_lport *)lp, NULL); |
| 179 | } |
| 180 | |
| 181 | /** |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 182 | * fcoe_netdev_config() - Set up netdev for SW FCoE |
| 183 | * @lp : ptr to the fc_lport |
| 184 | * @netdev : ptr to the associated netdevice struct |
| 185 | * |
| 186 | * Must be called after fcoe_lport_config() as it will use lport mutex |
| 187 | * |
| 188 | * Returns : 0 for success |
| 189 | */ |
| 190 | static int fcoe_netdev_config(struct fc_lport *lp, struct net_device *netdev) |
| 191 | { |
| 192 | u32 mfs; |
| 193 | u64 wwnn, wwpn; |
| 194 | struct fcoe_softc *fc; |
| 195 | u8 flogi_maddr[ETH_ALEN]; |
| 196 | |
| 197 | /* Setup lport private data to point to fcoe softc */ |
| 198 | fc = lport_priv(lp); |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 199 | fc->ctlr.lp = lp; |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 200 | fc->real_dev = netdev; |
| 201 | fc->phys_dev = netdev; |
| 202 | |
| 203 | /* Require support for get_pauseparam ethtool op. */ |
| 204 | if (netdev->priv_flags & IFF_802_1Q_VLAN) |
| 205 | fc->phys_dev = vlan_dev_real_dev(netdev); |
| 206 | |
| 207 | /* Do not support for bonding device */ |
| 208 | if ((fc->real_dev->priv_flags & IFF_MASTER_ALB) || |
| 209 | (fc->real_dev->priv_flags & IFF_SLAVE_INACTIVE) || |
| 210 | (fc->real_dev->priv_flags & IFF_MASTER_8023AD)) { |
| 211 | return -EOPNOTSUPP; |
| 212 | } |
| 213 | |
| 214 | /* |
| 215 | * Determine max frame size based on underlying device and optional |
| 216 | * user-configured limit. If the MFS is too low, fcoe_link_ok() |
| 217 | * will return 0, so do this first. |
| 218 | */ |
| 219 | mfs = fc->real_dev->mtu - (sizeof(struct fcoe_hdr) + |
| 220 | sizeof(struct fcoe_crc_eof)); |
| 221 | if (fc_set_mfs(lp, mfs)) |
| 222 | return -EINVAL; |
| 223 | |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 224 | /* offload features support */ |
| 225 | if (fc->real_dev->features & NETIF_F_SG) |
| 226 | lp->sg_supp = 1; |
| 227 | |
| 228 | #ifdef NETIF_F_FCOE_CRC |
| 229 | if (netdev->features & NETIF_F_FCOE_CRC) { |
| 230 | lp->crc_offload = 1; |
| 231 | printk(KERN_DEBUG "fcoe:%s supports FCCRC offload\n", |
| 232 | netdev->name); |
| 233 | } |
| 234 | #endif |
| 235 | #ifdef NETIF_F_FSO |
| 236 | if (netdev->features & NETIF_F_FSO) { |
| 237 | lp->seq_offload = 1; |
| 238 | lp->lso_max = netdev->gso_max_size; |
| 239 | printk(KERN_DEBUG "fcoe:%s supports LSO for max len 0x%x\n", |
| 240 | netdev->name, lp->lso_max); |
| 241 | } |
| 242 | #endif |
| 243 | if (netdev->fcoe_ddp_xid) { |
| 244 | lp->lro_enabled = 1; |
| 245 | lp->lro_xid = netdev->fcoe_ddp_xid; |
| 246 | printk(KERN_DEBUG "fcoe:%s supports LRO for max xid 0x%x\n", |
| 247 | netdev->name, lp->lro_xid); |
| 248 | } |
| 249 | skb_queue_head_init(&fc->fcoe_pending_queue); |
| 250 | fc->fcoe_pending_queue_active = 0; |
Vasu Dev | 1047f22 | 2009-05-06 10:52:40 -0700 | [diff] [blame] | 251 | setup_timer(&fc->timer, fcoe_queue_timer, (unsigned long)lp); |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 252 | |
| 253 | /* setup Source Mac Address */ |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 254 | memcpy(fc->ctlr.ctl_src_addr, fc->real_dev->dev_addr, |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 255 | fc->real_dev->addr_len); |
| 256 | |
| 257 | wwnn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 1, 0); |
| 258 | fc_set_wwnn(lp, wwnn); |
| 259 | /* XXX - 3rd arg needs to be vlan id */ |
| 260 | wwpn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 2, 0); |
| 261 | fc_set_wwpn(lp, wwpn); |
| 262 | |
| 263 | /* |
| 264 | * Add FCoE MAC address as second unicast MAC address |
| 265 | * or enter promiscuous mode if not capable of listening |
| 266 | * for multiple unicast MACs. |
| 267 | */ |
| 268 | rtnl_lock(); |
| 269 | memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); |
| 270 | dev_unicast_add(fc->real_dev, flogi_maddr, ETH_ALEN); |
Joe Eykholt | 6401bdc | 2009-04-21 16:27:46 -0700 | [diff] [blame] | 271 | dev_mc_add(fc->real_dev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0); |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 272 | rtnl_unlock(); |
| 273 | |
| 274 | /* |
| 275 | * setup the receive function from ethernet driver |
| 276 | * on the ethertype for the given device |
| 277 | */ |
| 278 | fc->fcoe_packet_type.func = fcoe_rcv; |
| 279 | fc->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE); |
| 280 | fc->fcoe_packet_type.dev = fc->real_dev; |
| 281 | dev_add_pack(&fc->fcoe_packet_type); |
| 282 | |
| 283 | return 0; |
| 284 | } |
| 285 | |
| 286 | /** |
| 287 | * fcoe_shost_config() - Sets up fc_lport->host |
| 288 | * @lp : ptr to the fc_lport |
| 289 | * @shost : ptr to the associated scsi host |
| 290 | * @dev : device associated to scsi host |
| 291 | * |
| 292 | * Must be called after fcoe_lport_config() and fcoe_netdev_config() |
| 293 | * |
| 294 | * Returns : 0 for success |
| 295 | */ |
| 296 | static int fcoe_shost_config(struct fc_lport *lp, struct Scsi_Host *shost, |
| 297 | struct device *dev) |
| 298 | { |
| 299 | int rc = 0; |
| 300 | |
| 301 | /* lport scsi host config */ |
| 302 | lp->host = shost; |
| 303 | |
| 304 | lp->host->max_lun = FCOE_MAX_LUN; |
| 305 | lp->host->max_id = FCOE_MAX_FCP_TARGET; |
| 306 | lp->host->max_channel = 0; |
| 307 | lp->host->transportt = scsi_transport_fcoe_sw; |
| 308 | |
| 309 | /* add the new host to the SCSI-ml */ |
| 310 | rc = scsi_add_host(lp->host, dev); |
| 311 | if (rc) { |
| 312 | FC_DBG("fcoe_shost_config:error on scsi_add_host\n"); |
| 313 | return rc; |
| 314 | } |
| 315 | sprintf(fc_host_symbolic_name(lp->host), "%s v%s over %s", |
| 316 | FCOE_NAME, FCOE_VERSION, |
| 317 | fcoe_netdev(lp)->name); |
| 318 | |
| 319 | return 0; |
| 320 | } |
| 321 | |
| 322 | /** |
| 323 | * fcoe_em_config() - allocates em for this lport |
| 324 | * @lp: the port that em is to allocated for |
| 325 | * |
| 326 | * Returns : 0 on success |
| 327 | */ |
| 328 | static inline int fcoe_em_config(struct fc_lport *lp) |
| 329 | { |
| 330 | BUG_ON(lp->emp); |
| 331 | |
| 332 | lp->emp = fc_exch_mgr_alloc(lp, FC_CLASS_3, |
| 333 | FCOE_MIN_XID, FCOE_MAX_XID); |
| 334 | if (!lp->emp) |
| 335 | return -ENOMEM; |
| 336 | |
| 337 | return 0; |
| 338 | } |
| 339 | |
| 340 | /** |
| 341 | * fcoe_if_destroy() - FCoE software HBA tear-down function |
| 342 | * @netdev: ptr to the associated net_device |
| 343 | * |
| 344 | * Returns: 0 if link is OK for use by FCoE. |
| 345 | */ |
| 346 | static int fcoe_if_destroy(struct net_device *netdev) |
| 347 | { |
| 348 | struct fc_lport *lp = NULL; |
| 349 | struct fcoe_softc *fc; |
| 350 | u8 flogi_maddr[ETH_ALEN]; |
| 351 | |
| 352 | BUG_ON(!netdev); |
| 353 | |
| 354 | printk(KERN_DEBUG "fcoe_if_destroy:interface on %s\n", |
| 355 | netdev->name); |
| 356 | |
| 357 | lp = fcoe_hostlist_lookup(netdev); |
| 358 | if (!lp) |
| 359 | return -ENODEV; |
| 360 | |
| 361 | fc = lport_priv(lp); |
| 362 | |
| 363 | /* Logout of the fabric */ |
| 364 | fc_fabric_logoff(lp); |
| 365 | |
| 366 | /* Remove the instance from fcoe's list */ |
| 367 | fcoe_hostlist_remove(lp); |
| 368 | |
| 369 | /* Don't listen for Ethernet packets anymore */ |
| 370 | dev_remove_pack(&fc->fcoe_packet_type); |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 371 | dev_remove_pack(&fc->fip_packet_type); |
| 372 | fcoe_ctlr_destroy(&fc->ctlr); |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 373 | |
| 374 | /* Cleanup the fc_lport */ |
| 375 | fc_lport_destroy(lp); |
| 376 | fc_fcp_destroy(lp); |
| 377 | |
| 378 | /* Detach from the scsi-ml */ |
| 379 | fc_remove_host(lp->host); |
| 380 | scsi_remove_host(lp->host); |
| 381 | |
| 382 | /* There are no more rports or I/O, free the EM */ |
| 383 | if (lp->emp) |
| 384 | fc_exch_mgr_free(lp->emp); |
| 385 | |
| 386 | /* Delete secondary MAC addresses */ |
| 387 | rtnl_lock(); |
| 388 | memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); |
| 389 | dev_unicast_delete(fc->real_dev, flogi_maddr, ETH_ALEN); |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 390 | if (!is_zero_ether_addr(fc->ctlr.data_src_addr)) |
| 391 | dev_unicast_delete(fc->real_dev, |
| 392 | fc->ctlr.data_src_addr, ETH_ALEN); |
| 393 | dev_mc_delete(fc->real_dev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0); |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 394 | rtnl_unlock(); |
| 395 | |
Chris Leech | dd3fd72 | 2009-04-21 16:27:36 -0700 | [diff] [blame] | 396 | /* Free the per-CPU receive threads */ |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 397 | fcoe_percpu_clean(lp); |
| 398 | |
| 399 | /* Free existing skbs */ |
| 400 | fcoe_clean_pending_queue(lp); |
| 401 | |
Vasu Dev | 1047f22 | 2009-05-06 10:52:40 -0700 | [diff] [blame] | 402 | /* Stop the timer */ |
| 403 | del_timer_sync(&fc->timer); |
| 404 | |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 405 | /* Free memory used by statistical counters */ |
| 406 | fc_lport_free_stats(lp); |
| 407 | |
| 408 | /* Release the net_device and Scsi_Host */ |
| 409 | dev_put(fc->real_dev); |
| 410 | scsi_host_put(lp->host); |
| 411 | |
| 412 | return 0; |
| 413 | } |
| 414 | |
| 415 | /* |
| 416 | * fcoe_ddp_setup - calls LLD's ddp_setup through net_device |
| 417 | * @lp: the corresponding fc_lport |
| 418 | * @xid: the exchange id for this ddp transfer |
| 419 | * @sgl: the scatterlist describing this transfer |
| 420 | * @sgc: number of sg items |
| 421 | * |
| 422 | * Returns : 0 no ddp |
| 423 | */ |
| 424 | static int fcoe_ddp_setup(struct fc_lport *lp, u16 xid, |
| 425 | struct scatterlist *sgl, unsigned int sgc) |
| 426 | { |
| 427 | struct net_device *n = fcoe_netdev(lp); |
| 428 | |
| 429 | if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_setup) |
| 430 | return n->netdev_ops->ndo_fcoe_ddp_setup(n, xid, sgl, sgc); |
| 431 | |
| 432 | return 0; |
| 433 | } |
| 434 | |
| 435 | /* |
| 436 | * fcoe_ddp_done - calls LLD's ddp_done through net_device |
| 437 | * @lp: the corresponding fc_lport |
| 438 | * @xid: the exchange id for this ddp transfer |
| 439 | * |
| 440 | * Returns : the length of data that have been completed by ddp |
| 441 | */ |
| 442 | static int fcoe_ddp_done(struct fc_lport *lp, u16 xid) |
| 443 | { |
| 444 | struct net_device *n = fcoe_netdev(lp); |
| 445 | |
| 446 | if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_done) |
| 447 | return n->netdev_ops->ndo_fcoe_ddp_done(n, xid); |
| 448 | return 0; |
| 449 | } |
| 450 | |
| 451 | static struct libfc_function_template fcoe_libfc_fcn_templ = { |
| 452 | .frame_send = fcoe_xmit, |
| 453 | .ddp_setup = fcoe_ddp_setup, |
| 454 | .ddp_done = fcoe_ddp_done, |
| 455 | }; |
| 456 | |
| 457 | /** |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 458 | * fcoe_fip_recv - handle a received FIP frame. |
| 459 | * @skb: the receive skb |
| 460 | * @dev: associated &net_device |
| 461 | * @ptype: the &packet_type structure which was used to register this handler. |
| 462 | * @orig_dev: original receive &net_device, in case @dev is a bond. |
| 463 | * |
| 464 | * Returns: 0 for success |
| 465 | */ |
| 466 | static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *dev, |
| 467 | struct packet_type *ptype, |
| 468 | struct net_device *orig_dev) |
| 469 | { |
| 470 | struct fcoe_softc *fc; |
| 471 | |
| 472 | fc = container_of(ptype, struct fcoe_softc, fip_packet_type); |
| 473 | fcoe_ctlr_recv(&fc->ctlr, skb); |
| 474 | return 0; |
| 475 | } |
| 476 | |
| 477 | /** |
| 478 | * fcoe_fip_send() - send an Ethernet-encapsulated FIP frame. |
| 479 | * @fip: FCoE controller. |
| 480 | * @skb: FIP Packet. |
| 481 | */ |
| 482 | static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb) |
| 483 | { |
| 484 | skb->dev = fcoe_from_ctlr(fip)->real_dev; |
| 485 | dev_queue_xmit(skb); |
| 486 | } |
| 487 | |
| 488 | /** |
| 489 | * fcoe_update_src_mac() - Update Ethernet MAC filters. |
| 490 | * @fip: FCoE controller. |
| 491 | * @old: Unicast MAC address to delete if the MAC is non-zero. |
| 492 | * @new: Unicast MAC address to add. |
| 493 | * |
| 494 | * Remove any previously-set unicast MAC filter. |
| 495 | * Add secondary FCoE MAC address filter for our OUI. |
| 496 | */ |
| 497 | static void fcoe_update_src_mac(struct fcoe_ctlr *fip, u8 *old, u8 *new) |
| 498 | { |
| 499 | struct fcoe_softc *fc; |
| 500 | |
| 501 | fc = fcoe_from_ctlr(fip); |
| 502 | rtnl_lock(); |
| 503 | if (!is_zero_ether_addr(old)) |
| 504 | dev_unicast_delete(fc->real_dev, old, ETH_ALEN); |
| 505 | dev_unicast_add(fc->real_dev, new, ETH_ALEN); |
| 506 | rtnl_unlock(); |
| 507 | } |
| 508 | |
| 509 | /** |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 510 | * fcoe_if_create() - this function creates the fcoe interface |
| 511 | * @netdev: pointer the associated netdevice |
| 512 | * |
| 513 | * Creates fc_lport struct and scsi_host for lport, configures lport |
| 514 | * and starts fabric login. |
| 515 | * |
| 516 | * Returns : 0 on success |
| 517 | */ |
| 518 | static int fcoe_if_create(struct net_device *netdev) |
| 519 | { |
| 520 | int rc; |
| 521 | struct fc_lport *lp = NULL; |
| 522 | struct fcoe_softc *fc; |
| 523 | struct Scsi_Host *shost; |
| 524 | |
| 525 | BUG_ON(!netdev); |
| 526 | |
| 527 | printk(KERN_DEBUG "fcoe_if_create:interface on %s\n", |
| 528 | netdev->name); |
| 529 | |
| 530 | lp = fcoe_hostlist_lookup(netdev); |
| 531 | if (lp) |
| 532 | return -EEXIST; |
| 533 | |
Vasu Dev | a0a25da | 2009-03-17 11:42:29 -0700 | [diff] [blame] | 534 | shost = libfc_host_alloc(&fcoe_shost_template, |
| 535 | sizeof(struct fcoe_softc)); |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 536 | if (!shost) { |
| 537 | FC_DBG("Could not allocate host structure\n"); |
| 538 | return -ENOMEM; |
| 539 | } |
| 540 | lp = shost_priv(shost); |
| 541 | fc = lport_priv(lp); |
| 542 | |
| 543 | /* configure fc_lport, e.g., em */ |
| 544 | rc = fcoe_lport_config(lp); |
| 545 | if (rc) { |
| 546 | FC_DBG("Could not configure lport\n"); |
| 547 | goto out_host_put; |
| 548 | } |
| 549 | |
| 550 | /* configure lport network properties */ |
| 551 | rc = fcoe_netdev_config(lp, netdev); |
| 552 | if (rc) { |
| 553 | FC_DBG("Could not configure netdev for lport\n"); |
| 554 | goto out_host_put; |
| 555 | } |
| 556 | |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 557 | /* |
| 558 | * Initialize FIP. |
| 559 | */ |
| 560 | fcoe_ctlr_init(&fc->ctlr); |
| 561 | fc->ctlr.send = fcoe_fip_send; |
| 562 | fc->ctlr.update_mac = fcoe_update_src_mac; |
| 563 | |
| 564 | fc->fip_packet_type.func = fcoe_fip_recv; |
| 565 | fc->fip_packet_type.type = htons(ETH_P_FIP); |
| 566 | fc->fip_packet_type.dev = fc->real_dev; |
| 567 | dev_add_pack(&fc->fip_packet_type); |
| 568 | |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 569 | /* configure lport scsi host properties */ |
| 570 | rc = fcoe_shost_config(lp, shost, &netdev->dev); |
| 571 | if (rc) { |
| 572 | FC_DBG("Could not configure shost for lport\n"); |
| 573 | goto out_host_put; |
| 574 | } |
| 575 | |
| 576 | /* lport exch manager allocation */ |
| 577 | rc = fcoe_em_config(lp); |
| 578 | if (rc) { |
| 579 | FC_DBG("Could not configure em for lport\n"); |
| 580 | goto out_host_put; |
| 581 | } |
| 582 | |
| 583 | /* Initialize the library */ |
| 584 | rc = fcoe_libfc_config(lp, &fcoe_libfc_fcn_templ); |
| 585 | if (rc) { |
| 586 | FC_DBG("Could not configure libfc for lport!\n"); |
| 587 | goto out_lp_destroy; |
| 588 | } |
| 589 | |
| 590 | /* add to lports list */ |
| 591 | fcoe_hostlist_add(lp); |
| 592 | |
| 593 | lp->boot_time = jiffies; |
| 594 | |
| 595 | fc_fabric_login(lp); |
| 596 | |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 597 | if (!fcoe_link_ok(lp)) |
| 598 | fcoe_ctlr_link_up(&fc->ctlr); |
| 599 | |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 600 | dev_hold(netdev); |
| 601 | |
| 602 | return rc; |
| 603 | |
| 604 | out_lp_destroy: |
| 605 | fc_exch_mgr_free(lp->emp); /* Free the EM */ |
| 606 | out_host_put: |
| 607 | scsi_host_put(lp->host); |
| 608 | return rc; |
| 609 | } |
| 610 | |
| 611 | /** |
| 612 | * fcoe_if_init() - attach to scsi transport |
| 613 | * |
| 614 | * Returns : 0 on success |
| 615 | */ |
| 616 | static int __init fcoe_if_init(void) |
| 617 | { |
| 618 | /* attach to scsi transport */ |
| 619 | scsi_transport_fcoe_sw = |
| 620 | fc_attach_transport(&fcoe_transport_function); |
| 621 | |
| 622 | if (!scsi_transport_fcoe_sw) { |
| 623 | printk(KERN_ERR "fcoe_init:fc_attach_transport() failed\n"); |
| 624 | return -ENODEV; |
| 625 | } |
| 626 | |
| 627 | return 0; |
| 628 | } |
| 629 | |
| 630 | /** |
| 631 | * fcoe_if_exit() - detach from scsi transport |
| 632 | * |
| 633 | * Returns : 0 on success |
| 634 | */ |
| 635 | int __exit fcoe_if_exit(void) |
| 636 | { |
| 637 | fc_release_transport(scsi_transport_fcoe_sw); |
| 638 | return 0; |
| 639 | } |
| 640 | |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 641 | /** |
Robert Love | 8976f42 | 2009-03-17 11:41:46 -0700 | [diff] [blame] | 642 | * fcoe_percpu_thread_create() - Create a receive thread for an online cpu |
| 643 | * @cpu: cpu index for the online cpu |
| 644 | */ |
| 645 | static void fcoe_percpu_thread_create(unsigned int cpu) |
| 646 | { |
| 647 | struct fcoe_percpu_s *p; |
| 648 | struct task_struct *thread; |
| 649 | |
| 650 | p = &per_cpu(fcoe_percpu, cpu); |
| 651 | |
| 652 | thread = kthread_create(fcoe_percpu_receive_thread, |
| 653 | (void *)p, "fcoethread/%d", cpu); |
| 654 | |
| 655 | if (likely(!IS_ERR(p->thread))) { |
| 656 | kthread_bind(thread, cpu); |
| 657 | wake_up_process(thread); |
| 658 | |
| 659 | spin_lock_bh(&p->fcoe_rx_list.lock); |
| 660 | p->thread = thread; |
| 661 | spin_unlock_bh(&p->fcoe_rx_list.lock); |
| 662 | } |
| 663 | } |
| 664 | |
| 665 | /** |
| 666 | * fcoe_percpu_thread_destroy() - removes the rx thread for the given cpu |
| 667 | * @cpu: cpu index the rx thread is to be removed |
| 668 | * |
| 669 | * Destroys a per-CPU Rx thread. Any pending skbs are moved to the |
| 670 | * current CPU's Rx thread. If the thread being destroyed is bound to |
| 671 | * the CPU processing this context the skbs will be freed. |
| 672 | */ |
| 673 | static void fcoe_percpu_thread_destroy(unsigned int cpu) |
| 674 | { |
| 675 | struct fcoe_percpu_s *p; |
| 676 | struct task_struct *thread; |
| 677 | struct page *crc_eof; |
| 678 | struct sk_buff *skb; |
| 679 | #ifdef CONFIG_SMP |
| 680 | struct fcoe_percpu_s *p0; |
| 681 | unsigned targ_cpu = smp_processor_id(); |
| 682 | #endif /* CONFIG_SMP */ |
| 683 | |
| 684 | printk(KERN_DEBUG "fcoe: Destroying receive thread for CPU %d\n", cpu); |
| 685 | |
| 686 | /* Prevent any new skbs from being queued for this CPU. */ |
| 687 | p = &per_cpu(fcoe_percpu, cpu); |
| 688 | spin_lock_bh(&p->fcoe_rx_list.lock); |
| 689 | thread = p->thread; |
| 690 | p->thread = NULL; |
| 691 | crc_eof = p->crc_eof_page; |
| 692 | p->crc_eof_page = NULL; |
| 693 | p->crc_eof_offset = 0; |
| 694 | spin_unlock_bh(&p->fcoe_rx_list.lock); |
| 695 | |
| 696 | #ifdef CONFIG_SMP |
| 697 | /* |
| 698 | * Don't bother moving the skb's if this context is running |
| 699 | * on the same CPU that is having its thread destroyed. This |
| 700 | * can easily happen when the module is removed. |
| 701 | */ |
| 702 | if (cpu != targ_cpu) { |
| 703 | p0 = &per_cpu(fcoe_percpu, targ_cpu); |
| 704 | spin_lock_bh(&p0->fcoe_rx_list.lock); |
| 705 | if (p0->thread) { |
| 706 | FC_DBG("Moving frames from CPU %d to CPU %d\n", |
| 707 | cpu, targ_cpu); |
| 708 | |
| 709 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) |
| 710 | __skb_queue_tail(&p0->fcoe_rx_list, skb); |
| 711 | spin_unlock_bh(&p0->fcoe_rx_list.lock); |
| 712 | } else { |
| 713 | /* |
| 714 | * The targeted CPU is not initialized and cannot accept |
| 715 | * new skbs. Unlock the targeted CPU and drop the skbs |
| 716 | * on the CPU that is going offline. |
| 717 | */ |
| 718 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) |
| 719 | kfree_skb(skb); |
| 720 | spin_unlock_bh(&p0->fcoe_rx_list.lock); |
| 721 | } |
| 722 | } else { |
| 723 | /* |
| 724 | * This scenario occurs when the module is being removed |
| 725 | * and all threads are being destroyed. skbs will continue |
| 726 | * to be shifted from the CPU thread that is being removed |
| 727 | * to the CPU thread associated with the CPU that is processing |
| 728 | * the module removal. Once there is only one CPU Rx thread it |
| 729 | * will reach this case and we will drop all skbs and later |
| 730 | * stop the thread. |
| 731 | */ |
| 732 | spin_lock_bh(&p->fcoe_rx_list.lock); |
| 733 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) |
| 734 | kfree_skb(skb); |
| 735 | spin_unlock_bh(&p->fcoe_rx_list.lock); |
| 736 | } |
| 737 | #else |
| 738 | /* |
Chris Leech | dd3fd72 | 2009-04-21 16:27:36 -0700 | [diff] [blame] | 739 | * This a non-SMP scenario where the singular Rx thread is |
Robert Love | 8976f42 | 2009-03-17 11:41:46 -0700 | [diff] [blame] | 740 | * being removed. Free all skbs and stop the thread. |
| 741 | */ |
| 742 | spin_lock_bh(&p->fcoe_rx_list.lock); |
| 743 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) |
| 744 | kfree_skb(skb); |
| 745 | spin_unlock_bh(&p->fcoe_rx_list.lock); |
| 746 | #endif |
| 747 | |
| 748 | if (thread) |
| 749 | kthread_stop(thread); |
| 750 | |
| 751 | if (crc_eof) |
| 752 | put_page(crc_eof); |
| 753 | } |
| 754 | |
| 755 | /** |
| 756 | * fcoe_cpu_callback() - fcoe cpu hotplug event callback |
| 757 | * @nfb: callback data block |
| 758 | * @action: event triggering the callback |
| 759 | * @hcpu: index for the cpu of this event |
| 760 | * |
| 761 | * This creates or destroys per cpu data for fcoe |
| 762 | * |
| 763 | * Returns NOTIFY_OK always. |
| 764 | */ |
| 765 | static int fcoe_cpu_callback(struct notifier_block *nfb, |
| 766 | unsigned long action, void *hcpu) |
| 767 | { |
| 768 | unsigned cpu = (unsigned long)hcpu; |
| 769 | |
| 770 | switch (action) { |
| 771 | case CPU_ONLINE: |
| 772 | case CPU_ONLINE_FROZEN: |
| 773 | FC_DBG("CPU %x online: Create Rx thread\n", cpu); |
| 774 | fcoe_percpu_thread_create(cpu); |
| 775 | break; |
| 776 | case CPU_DEAD: |
| 777 | case CPU_DEAD_FROZEN: |
| 778 | FC_DBG("CPU %x offline: Remove Rx thread\n", cpu); |
| 779 | fcoe_percpu_thread_destroy(cpu); |
| 780 | break; |
| 781 | default: |
| 782 | break; |
| 783 | } |
| 784 | return NOTIFY_OK; |
| 785 | } |
| 786 | |
| 787 | static struct notifier_block fcoe_cpu_notifier = { |
| 788 | .notifier_call = fcoe_cpu_callback, |
| 789 | }; |
| 790 | |
| 791 | /** |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 792 | * fcoe_rcv() - this is the fcoe receive function called by NET_RX_SOFTIRQ |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 793 | * @skb: the receive skb |
| 794 | * @dev: associated net device |
| 795 | * @ptype: context |
Chris Leech | dd3fd72 | 2009-04-21 16:27:36 -0700 | [diff] [blame] | 796 | * @olddev: last device |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 797 | * |
| 798 | * this function will receive the packet and build fc frame and pass it up |
| 799 | * |
| 800 | * Returns: 0 for success |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 801 | */ |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 802 | int fcoe_rcv(struct sk_buff *skb, struct net_device *dev, |
| 803 | struct packet_type *ptype, struct net_device *olddev) |
| 804 | { |
| 805 | struct fc_lport *lp; |
| 806 | struct fcoe_rcv_info *fr; |
| 807 | struct fcoe_softc *fc; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 808 | struct fc_frame_header *fh; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 809 | struct fcoe_percpu_s *fps; |
Robert Love | 38eccab | 2009-03-17 11:41:30 -0700 | [diff] [blame] | 810 | unsigned short oxid; |
Robert Love | 8976f42 | 2009-03-17 11:41:46 -0700 | [diff] [blame] | 811 | unsigned int cpu = 0; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 812 | |
| 813 | fc = container_of(ptype, struct fcoe_softc, fcoe_packet_type); |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 814 | lp = fc->ctlr.lp; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 815 | if (unlikely(lp == NULL)) { |
| 816 | FC_DBG("cannot find hba structure"); |
| 817 | goto err2; |
| 818 | } |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 819 | if (!lp->link_up) |
| 820 | goto err2; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 821 | |
| 822 | if (unlikely(debug_fcoe)) { |
| 823 | FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p tail:%p " |
| 824 | "end:%p sum:%d dev:%s", skb->len, skb->data_len, |
| 825 | skb->head, skb->data, skb_tail_pointer(skb), |
| 826 | skb_end_pointer(skb), skb->csum, |
| 827 | skb->dev ? skb->dev->name : "<NULL>"); |
| 828 | |
| 829 | } |
| 830 | |
| 831 | /* check for FCOE packet type */ |
| 832 | if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) { |
| 833 | FC_DBG("wrong FC type frame"); |
| 834 | goto err; |
| 835 | } |
| 836 | |
| 837 | /* |
| 838 | * Check for minimum frame length, and make sure required FCoE |
| 839 | * and FC headers are pulled into the linear data area. |
| 840 | */ |
| 841 | if (unlikely((skb->len < FCOE_MIN_FRAME) || |
| 842 | !pskb_may_pull(skb, FCOE_HEADER_LEN))) |
| 843 | goto err; |
| 844 | |
| 845 | skb_set_transport_header(skb, sizeof(struct fcoe_hdr)); |
| 846 | fh = (struct fc_frame_header *) skb_transport_header(skb); |
| 847 | |
| 848 | oxid = ntohs(fh->fh_ox_id); |
| 849 | |
| 850 | fr = fcoe_dev_from_skb(skb); |
| 851 | fr->fr_dev = lp; |
| 852 | fr->ptype = ptype; |
Robert Love | 5e5e92d | 2009-03-17 11:41:35 -0700 | [diff] [blame] | 853 | |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 854 | #ifdef CONFIG_SMP |
| 855 | /* |
| 856 | * The incoming frame exchange id(oxid) is ANDed with num of online |
Robert Love | 8976f42 | 2009-03-17 11:41:46 -0700 | [diff] [blame] | 857 | * cpu bits to get cpu and then this cpu is used for selecting |
| 858 | * a per cpu kernel thread from fcoe_percpu. |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 859 | */ |
Robert Love | 8976f42 | 2009-03-17 11:41:46 -0700 | [diff] [blame] | 860 | cpu = oxid & (num_online_cpus() - 1); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 861 | #endif |
Robert Love | 5e5e92d | 2009-03-17 11:41:35 -0700 | [diff] [blame] | 862 | |
Robert Love | 8976f42 | 2009-03-17 11:41:46 -0700 | [diff] [blame] | 863 | fps = &per_cpu(fcoe_percpu, cpu); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 864 | spin_lock_bh(&fps->fcoe_rx_list.lock); |
Robert Love | 8976f42 | 2009-03-17 11:41:46 -0700 | [diff] [blame] | 865 | if (unlikely(!fps->thread)) { |
| 866 | /* |
| 867 | * The targeted CPU is not ready, let's target |
| 868 | * the first CPU now. For non-SMP systems this |
| 869 | * will check the same CPU twice. |
| 870 | */ |
| 871 | FC_DBG("CPU is online, but no receive thread ready " |
| 872 | "for incoming skb- using first online CPU.\n"); |
| 873 | |
| 874 | spin_unlock_bh(&fps->fcoe_rx_list.lock); |
| 875 | cpu = first_cpu(cpu_online_map); |
| 876 | fps = &per_cpu(fcoe_percpu, cpu); |
| 877 | spin_lock_bh(&fps->fcoe_rx_list.lock); |
| 878 | if (!fps->thread) { |
| 879 | spin_unlock_bh(&fps->fcoe_rx_list.lock); |
| 880 | goto err; |
| 881 | } |
| 882 | } |
| 883 | |
| 884 | /* |
| 885 | * We now have a valid CPU that we're targeting for |
| 886 | * this skb. We also have this receive thread locked, |
| 887 | * so we're free to queue skbs into it's queue. |
| 888 | */ |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 889 | __skb_queue_tail(&fps->fcoe_rx_list, skb); |
| 890 | if (fps->fcoe_rx_list.qlen == 1) |
| 891 | wake_up_process(fps->thread); |
| 892 | |
| 893 | spin_unlock_bh(&fps->fcoe_rx_list.lock); |
| 894 | |
| 895 | return 0; |
| 896 | err: |
Robert Love | 582b45b | 2009-03-31 15:51:50 -0700 | [diff] [blame] | 897 | fc_lport_get_stats(lp)->ErrorFrames++; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 898 | |
| 899 | err2: |
| 900 | kfree_skb(skb); |
| 901 | return -1; |
| 902 | } |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 903 | |
| 904 | /** |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 905 | * fcoe_start_io() - pass to netdev to start xmit for fcoe |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 906 | * @skb: the skb to be xmitted |
| 907 | * |
| 908 | * Returns: 0 for success |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 909 | */ |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 910 | static inline int fcoe_start_io(struct sk_buff *skb) |
| 911 | { |
| 912 | int rc; |
| 913 | |
| 914 | skb_get(skb); |
| 915 | rc = dev_queue_xmit(skb); |
| 916 | if (rc != 0) |
| 917 | return rc; |
| 918 | kfree_skb(skb); |
| 919 | return 0; |
| 920 | } |
| 921 | |
| 922 | /** |
Chris Leech | dd3fd72 | 2009-04-21 16:27:36 -0700 | [diff] [blame] | 923 | * fcoe_get_paged_crc_eof() - in case we need to alloc a page for crc_eof |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 924 | * @skb: the skb to be xmitted |
| 925 | * @tlen: total len |
| 926 | * |
| 927 | * Returns: 0 for success |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 928 | */ |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 929 | static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen) |
| 930 | { |
| 931 | struct fcoe_percpu_s *fps; |
| 932 | struct page *page; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 933 | |
Robert Love | 5e5e92d | 2009-03-17 11:41:35 -0700 | [diff] [blame] | 934 | fps = &get_cpu_var(fcoe_percpu); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 935 | page = fps->crc_eof_page; |
| 936 | if (!page) { |
| 937 | page = alloc_page(GFP_ATOMIC); |
| 938 | if (!page) { |
Robert Love | 5e5e92d | 2009-03-17 11:41:35 -0700 | [diff] [blame] | 939 | put_cpu_var(fcoe_percpu); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 940 | return -ENOMEM; |
| 941 | } |
| 942 | fps->crc_eof_page = page; |
Robert Love | 8976f42 | 2009-03-17 11:41:46 -0700 | [diff] [blame] | 943 | fps->crc_eof_offset = 0; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 944 | } |
| 945 | |
| 946 | get_page(page); |
| 947 | skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page, |
| 948 | fps->crc_eof_offset, tlen); |
| 949 | skb->len += tlen; |
| 950 | skb->data_len += tlen; |
| 951 | skb->truesize += tlen; |
| 952 | fps->crc_eof_offset += sizeof(struct fcoe_crc_eof); |
| 953 | |
| 954 | if (fps->crc_eof_offset >= PAGE_SIZE) { |
| 955 | fps->crc_eof_page = NULL; |
| 956 | fps->crc_eof_offset = 0; |
| 957 | put_page(page); |
| 958 | } |
Robert Love | 5e5e92d | 2009-03-17 11:41:35 -0700 | [diff] [blame] | 959 | put_cpu_var(fcoe_percpu); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 960 | return 0; |
| 961 | } |
| 962 | |
| 963 | /** |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 964 | * fcoe_fc_crc() - calculates FC CRC in this fcoe skb |
Chris Leech | dd3fd72 | 2009-04-21 16:27:36 -0700 | [diff] [blame] | 965 | * @fp: the fc_frame containing data to be checksummed |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 966 | * |
| 967 | * This uses crc32() to calculate the crc for fc frame |
| 968 | * Return : 32 bit crc |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 969 | */ |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 970 | u32 fcoe_fc_crc(struct fc_frame *fp) |
| 971 | { |
| 972 | struct sk_buff *skb = fp_skb(fp); |
| 973 | struct skb_frag_struct *frag; |
| 974 | unsigned char *data; |
| 975 | unsigned long off, len, clen; |
| 976 | u32 crc; |
| 977 | unsigned i; |
| 978 | |
| 979 | crc = crc32(~0, skb->data, skb_headlen(skb)); |
| 980 | |
| 981 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
| 982 | frag = &skb_shinfo(skb)->frags[i]; |
| 983 | off = frag->page_offset; |
| 984 | len = frag->size; |
| 985 | while (len > 0) { |
| 986 | clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK)); |
| 987 | data = kmap_atomic(frag->page + (off >> PAGE_SHIFT), |
| 988 | KM_SKB_DATA_SOFTIRQ); |
| 989 | crc = crc32(crc, data + (off & ~PAGE_MASK), clen); |
| 990 | kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ); |
| 991 | off += clen; |
| 992 | len -= clen; |
| 993 | } |
| 994 | } |
| 995 | return crc; |
| 996 | } |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 997 | |
| 998 | /** |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 999 | * fcoe_xmit() - FCoE frame transmit function |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1000 | * @lp: the associated local port |
| 1001 | * @fp: the fc_frame to be transmitted |
| 1002 | * |
| 1003 | * Return : 0 for success |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1004 | */ |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1005 | int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp) |
| 1006 | { |
Vasu Dev | 4bb6b51 | 2009-05-06 10:52:34 -0700 | [diff] [blame] | 1007 | int wlen; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1008 | u32 crc; |
| 1009 | struct ethhdr *eh; |
| 1010 | struct fcoe_crc_eof *cp; |
| 1011 | struct sk_buff *skb; |
| 1012 | struct fcoe_dev_stats *stats; |
| 1013 | struct fc_frame_header *fh; |
| 1014 | unsigned int hlen; /* header length implies the version */ |
| 1015 | unsigned int tlen; /* trailer length */ |
| 1016 | unsigned int elen; /* eth header, may include vlan */ |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1017 | struct fcoe_softc *fc; |
| 1018 | u8 sof, eof; |
| 1019 | struct fcoe_hdr *hp; |
| 1020 | |
| 1021 | WARN_ON((fr_len(fp) % sizeof(u32)) != 0); |
| 1022 | |
Robert Love | fc47ff6 | 2009-02-27 10:55:55 -0800 | [diff] [blame] | 1023 | fc = lport_priv(lp); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1024 | fh = fc_frame_header_get(fp); |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 1025 | skb = fp_skb(fp); |
| 1026 | wlen = skb->len / FCOE_WORD_TO_BYTE; |
| 1027 | |
| 1028 | if (!lp->link_up) { |
Dan Carpenter | 3caf02e | 2009-04-21 16:27:25 -0700 | [diff] [blame] | 1029 | kfree_skb(skb); |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 1030 | return 0; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1031 | } |
| 1032 | |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 1033 | if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ) && |
| 1034 | fcoe_ctlr_els_send(&fc->ctlr, skb)) |
| 1035 | return 0; |
| 1036 | |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1037 | sof = fr_sof(fp); |
| 1038 | eof = fr_eof(fp); |
| 1039 | |
Vasu Dev | 4e57e1c | 2009-05-06 10:52:46 -0700 | [diff] [blame^] | 1040 | elen = sizeof(struct ethhdr); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1041 | hlen = sizeof(struct fcoe_hdr); |
| 1042 | tlen = sizeof(struct fcoe_crc_eof); |
| 1043 | wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE; |
| 1044 | |
| 1045 | /* crc offload */ |
| 1046 | if (likely(lp->crc_offload)) { |
Yi Zou | 39ca9a0 | 2009-02-27 14:07:15 -0800 | [diff] [blame] | 1047 | skb->ip_summed = CHECKSUM_PARTIAL; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1048 | skb->csum_start = skb_headroom(skb); |
| 1049 | skb->csum_offset = skb->len; |
| 1050 | crc = 0; |
| 1051 | } else { |
| 1052 | skb->ip_summed = CHECKSUM_NONE; |
| 1053 | crc = fcoe_fc_crc(fp); |
| 1054 | } |
| 1055 | |
| 1056 | /* copy fc crc and eof to the skb buff */ |
| 1057 | if (skb_is_nonlinear(skb)) { |
| 1058 | skb_frag_t *frag; |
| 1059 | if (fcoe_get_paged_crc_eof(skb, tlen)) { |
Roel Kluin | e904158 | 2009-02-27 10:56:22 -0800 | [diff] [blame] | 1060 | kfree_skb(skb); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1061 | return -ENOMEM; |
| 1062 | } |
| 1063 | frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1]; |
| 1064 | cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ) |
| 1065 | + frag->page_offset; |
| 1066 | } else { |
| 1067 | cp = (struct fcoe_crc_eof *)skb_put(skb, tlen); |
| 1068 | } |
| 1069 | |
| 1070 | memset(cp, 0, sizeof(*cp)); |
| 1071 | cp->fcoe_eof = eof; |
| 1072 | cp->fcoe_crc32 = cpu_to_le32(~crc); |
| 1073 | |
| 1074 | if (skb_is_nonlinear(skb)) { |
| 1075 | kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ); |
| 1076 | cp = NULL; |
| 1077 | } |
| 1078 | |
Chris Leech | dd3fd72 | 2009-04-21 16:27:36 -0700 | [diff] [blame] | 1079 | /* adjust skb network/transport offsets to match mac/fcoe/fc */ |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1080 | skb_push(skb, elen + hlen); |
| 1081 | skb_reset_mac_header(skb); |
| 1082 | skb_reset_network_header(skb); |
| 1083 | skb->mac_len = elen; |
Yi Zou | 211c738 | 2009-02-27 14:06:37 -0800 | [diff] [blame] | 1084 | skb->protocol = htons(ETH_P_FCOE); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1085 | skb->dev = fc->real_dev; |
| 1086 | |
| 1087 | /* fill up mac and fcoe headers */ |
| 1088 | eh = eth_hdr(skb); |
| 1089 | eh->h_proto = htons(ETH_P_FCOE); |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 1090 | if (fc->ctlr.map_dest) |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1091 | fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id); |
| 1092 | else |
| 1093 | /* insert GW address */ |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 1094 | memcpy(eh->h_dest, fc->ctlr.dest_addr, ETH_ALEN); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1095 | |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 1096 | if (unlikely(fc->ctlr.flogi_oxid != FC_XID_UNKNOWN)) |
| 1097 | memcpy(eh->h_source, fc->ctlr.ctl_src_addr, ETH_ALEN); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1098 | else |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 1099 | memcpy(eh->h_source, fc->ctlr.data_src_addr, ETH_ALEN); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1100 | |
| 1101 | hp = (struct fcoe_hdr *)(eh + 1); |
| 1102 | memset(hp, 0, sizeof(*hp)); |
| 1103 | if (FC_FCOE_VER) |
| 1104 | FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER); |
| 1105 | hp->fcoe_sof = sof; |
| 1106 | |
Yi Zou | 39ca9a0 | 2009-02-27 14:07:15 -0800 | [diff] [blame] | 1107 | #ifdef NETIF_F_FSO |
| 1108 | /* fcoe lso, mss is in max_payload which is non-zero for FCP data */ |
| 1109 | if (lp->seq_offload && fr_max_payload(fp)) { |
| 1110 | skb_shinfo(skb)->gso_type = SKB_GSO_FCOE; |
| 1111 | skb_shinfo(skb)->gso_size = fr_max_payload(fp); |
| 1112 | } else { |
| 1113 | skb_shinfo(skb)->gso_type = 0; |
| 1114 | skb_shinfo(skb)->gso_size = 0; |
| 1115 | } |
| 1116 | #endif |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1117 | /* update tx stats: regardless if LLD fails */ |
Robert Love | 582b45b | 2009-03-31 15:51:50 -0700 | [diff] [blame] | 1118 | stats = fc_lport_get_stats(lp); |
| 1119 | stats->TxFrames++; |
| 1120 | stats->TxWords += wlen; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1121 | |
| 1122 | /* send down to lld */ |
| 1123 | fr_dev(fp) = lp; |
| 1124 | if (fc->fcoe_pending_queue.qlen) |
Vasu Dev | 4bb6b51 | 2009-05-06 10:52:34 -0700 | [diff] [blame] | 1125 | fcoe_check_wait_queue(lp, skb); |
| 1126 | else if (fcoe_start_io(skb)) |
| 1127 | fcoe_check_wait_queue(lp, skb); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1128 | |
| 1129 | return 0; |
| 1130 | } |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1131 | |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1132 | /** |
| 1133 | * fcoe_percpu_receive_thread() - recv thread per cpu |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1134 | * @arg: ptr to the fcoe per cpu struct |
| 1135 | * |
| 1136 | * Return: 0 for success |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1137 | */ |
| 1138 | int fcoe_percpu_receive_thread(void *arg) |
| 1139 | { |
| 1140 | struct fcoe_percpu_s *p = arg; |
| 1141 | u32 fr_len; |
| 1142 | struct fc_lport *lp; |
| 1143 | struct fcoe_rcv_info *fr; |
| 1144 | struct fcoe_dev_stats *stats; |
| 1145 | struct fc_frame_header *fh; |
| 1146 | struct sk_buff *skb; |
| 1147 | struct fcoe_crc_eof crc_eof; |
| 1148 | struct fc_frame *fp; |
| 1149 | u8 *mac = NULL; |
| 1150 | struct fcoe_softc *fc; |
| 1151 | struct fcoe_hdr *hp; |
| 1152 | |
Robert Love | 4469c19 | 2009-02-27 10:56:38 -0800 | [diff] [blame] | 1153 | set_user_nice(current, -20); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1154 | |
| 1155 | while (!kthread_should_stop()) { |
| 1156 | |
| 1157 | spin_lock_bh(&p->fcoe_rx_list.lock); |
| 1158 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) { |
| 1159 | set_current_state(TASK_INTERRUPTIBLE); |
| 1160 | spin_unlock_bh(&p->fcoe_rx_list.lock); |
| 1161 | schedule(); |
| 1162 | set_current_state(TASK_RUNNING); |
| 1163 | if (kthread_should_stop()) |
| 1164 | return 0; |
| 1165 | spin_lock_bh(&p->fcoe_rx_list.lock); |
| 1166 | } |
| 1167 | spin_unlock_bh(&p->fcoe_rx_list.lock); |
| 1168 | fr = fcoe_dev_from_skb(skb); |
| 1169 | lp = fr->fr_dev; |
| 1170 | if (unlikely(lp == NULL)) { |
| 1171 | FC_DBG("invalid HBA Structure"); |
| 1172 | kfree_skb(skb); |
| 1173 | continue; |
| 1174 | } |
| 1175 | |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1176 | if (unlikely(debug_fcoe)) { |
| 1177 | FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p " |
| 1178 | "tail:%p end:%p sum:%d dev:%s", |
| 1179 | skb->len, skb->data_len, |
| 1180 | skb->head, skb->data, skb_tail_pointer(skb), |
| 1181 | skb_end_pointer(skb), skb->csum, |
| 1182 | skb->dev ? skb->dev->name : "<NULL>"); |
| 1183 | } |
| 1184 | |
| 1185 | /* |
| 1186 | * Save source MAC address before discarding header. |
| 1187 | */ |
| 1188 | fc = lport_priv(lp); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1189 | if (skb_is_nonlinear(skb)) |
| 1190 | skb_linearize(skb); /* not ideal */ |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 1191 | mac = eth_hdr(skb)->h_source; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1192 | |
| 1193 | /* |
| 1194 | * Frame length checks and setting up the header pointers |
| 1195 | * was done in fcoe_rcv already. |
| 1196 | */ |
| 1197 | hp = (struct fcoe_hdr *) skb_network_header(skb); |
| 1198 | fh = (struct fc_frame_header *) skb_transport_header(skb); |
| 1199 | |
Robert Love | 582b45b | 2009-03-31 15:51:50 -0700 | [diff] [blame] | 1200 | stats = fc_lport_get_stats(lp); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1201 | if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) { |
Robert Love | 582b45b | 2009-03-31 15:51:50 -0700 | [diff] [blame] | 1202 | if (stats->ErrorFrames < 5) |
| 1203 | printk(KERN_WARNING "FCoE version " |
| 1204 | "mismatch: The frame has " |
| 1205 | "version %x, but the " |
| 1206 | "initiator supports version " |
| 1207 | "%x\n", FC_FCOE_DECAPS_VER(hp), |
| 1208 | FC_FCOE_VER); |
| 1209 | stats->ErrorFrames++; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1210 | kfree_skb(skb); |
| 1211 | continue; |
| 1212 | } |
| 1213 | |
| 1214 | skb_pull(skb, sizeof(struct fcoe_hdr)); |
| 1215 | fr_len = skb->len - sizeof(struct fcoe_crc_eof); |
| 1216 | |
Robert Love | 582b45b | 2009-03-31 15:51:50 -0700 | [diff] [blame] | 1217 | stats->RxFrames++; |
| 1218 | stats->RxWords += fr_len / FCOE_WORD_TO_BYTE; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1219 | |
| 1220 | fp = (struct fc_frame *)skb; |
| 1221 | fc_frame_init(fp); |
| 1222 | fr_dev(fp) = lp; |
| 1223 | fr_sof(fp) = hp->fcoe_sof; |
| 1224 | |
| 1225 | /* Copy out the CRC and EOF trailer for access */ |
| 1226 | if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) { |
| 1227 | kfree_skb(skb); |
| 1228 | continue; |
| 1229 | } |
| 1230 | fr_eof(fp) = crc_eof.fcoe_eof; |
| 1231 | fr_crc(fp) = crc_eof.fcoe_crc32; |
| 1232 | if (pskb_trim(skb, fr_len)) { |
| 1233 | kfree_skb(skb); |
| 1234 | continue; |
| 1235 | } |
| 1236 | |
| 1237 | /* |
| 1238 | * We only check CRC if no offload is available and if it is |
| 1239 | * it's solicited data, in which case, the FCP layer would |
| 1240 | * check it during the copy. |
| 1241 | */ |
Yi Zou | 07c00ec | 2009-02-27 14:07:31 -0800 | [diff] [blame] | 1242 | if (lp->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY) |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1243 | fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; |
| 1244 | else |
| 1245 | fr_flags(fp) |= FCPHF_CRC_UNCHECKED; |
| 1246 | |
| 1247 | fh = fc_frame_header_get(fp); |
| 1248 | if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && |
| 1249 | fh->fh_type == FC_TYPE_FCP) { |
| 1250 | fc_exch_recv(lp, lp->emp, fp); |
| 1251 | continue; |
| 1252 | } |
| 1253 | if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) { |
| 1254 | if (le32_to_cpu(fr_crc(fp)) != |
| 1255 | ~crc32(~0, skb->data, fr_len)) { |
| 1256 | if (debug_fcoe || stats->InvalidCRCCount < 5) |
| 1257 | printk(KERN_WARNING "fcoe: dropping " |
| 1258 | "frame with CRC error\n"); |
| 1259 | stats->InvalidCRCCount++; |
| 1260 | stats->ErrorFrames++; |
| 1261 | fc_frame_free(fp); |
| 1262 | continue; |
| 1263 | } |
| 1264 | fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; |
| 1265 | } |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 1266 | if (unlikely(fc->ctlr.flogi_oxid != FC_XID_UNKNOWN) && |
| 1267 | fcoe_ctlr_recv_flogi(&fc->ctlr, fp, mac)) { |
| 1268 | fc_frame_free(fp); |
| 1269 | continue; |
| 1270 | } |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1271 | fc_exch_recv(lp, lp->emp, fp); |
| 1272 | } |
| 1273 | return 0; |
| 1274 | } |
| 1275 | |
| 1276 | /** |
Chris Leech | dd3fd72 | 2009-04-21 16:27:36 -0700 | [diff] [blame] | 1277 | * fcoe_check_wait_queue() - attempt to clear the transmit backlog |
| 1278 | * @lp: the fc_lport |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1279 | * |
| 1280 | * This empties the wait_queue, dequeue the head of the wait_queue queue |
| 1281 | * and calls fcoe_start_io() for each packet, if all skb have been |
Vasu Dev | c826a31 | 2009-02-27 10:56:27 -0800 | [diff] [blame] | 1282 | * transmitted, return qlen or -1 if a error occurs, then restore |
Chris Leech | dd3fd72 | 2009-04-21 16:27:36 -0700 | [diff] [blame] | 1283 | * wait_queue and try again later. |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1284 | * |
| 1285 | * The wait_queue is used when the skb transmit fails. skb will go |
Chris Leech | dd3fd72 | 2009-04-21 16:27:36 -0700 | [diff] [blame] | 1286 | * in the wait_queue which will be emptied by the timer function or |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1287 | * by the next skb transmit. |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1288 | */ |
Vasu Dev | 4bb6b51 | 2009-05-06 10:52:34 -0700 | [diff] [blame] | 1289 | static void fcoe_check_wait_queue(struct fc_lport *lp, struct sk_buff *skb) |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1290 | { |
Chris Leech | 55c8baf | 2009-02-27 10:56:32 -0800 | [diff] [blame] | 1291 | struct fcoe_softc *fc = lport_priv(lp); |
Vasu Dev | 4bb6b51 | 2009-05-06 10:52:34 -0700 | [diff] [blame] | 1292 | int rc; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1293 | |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1294 | spin_lock_bh(&fc->fcoe_pending_queue.lock); |
Vasu Dev | 4bb6b51 | 2009-05-06 10:52:34 -0700 | [diff] [blame] | 1295 | |
| 1296 | if (skb) |
| 1297 | __skb_queue_tail(&fc->fcoe_pending_queue, skb); |
| 1298 | |
Vasu Dev | c826a31 | 2009-02-27 10:56:27 -0800 | [diff] [blame] | 1299 | if (fc->fcoe_pending_queue_active) |
| 1300 | goto out; |
| 1301 | fc->fcoe_pending_queue_active = 1; |
Chris Leech | 55c8baf | 2009-02-27 10:56:32 -0800 | [diff] [blame] | 1302 | |
| 1303 | while (fc->fcoe_pending_queue.qlen) { |
| 1304 | /* keep qlen > 0 until fcoe_start_io succeeds */ |
| 1305 | fc->fcoe_pending_queue.qlen++; |
| 1306 | skb = __skb_dequeue(&fc->fcoe_pending_queue); |
| 1307 | |
| 1308 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); |
| 1309 | rc = fcoe_start_io(skb); |
| 1310 | spin_lock_bh(&fc->fcoe_pending_queue.lock); |
| 1311 | |
| 1312 | if (rc) { |
| 1313 | __skb_queue_head(&fc->fcoe_pending_queue, skb); |
| 1314 | /* undo temporary increment above */ |
| 1315 | fc->fcoe_pending_queue.qlen--; |
| 1316 | break; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1317 | } |
Chris Leech | 55c8baf | 2009-02-27 10:56:32 -0800 | [diff] [blame] | 1318 | /* undo temporary increment above */ |
| 1319 | fc->fcoe_pending_queue.qlen--; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1320 | } |
Chris Leech | 55c8baf | 2009-02-27 10:56:32 -0800 | [diff] [blame] | 1321 | |
| 1322 | if (fc->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH) |
| 1323 | lp->qfull = 0; |
Vasu Dev | 1047f22 | 2009-05-06 10:52:40 -0700 | [diff] [blame] | 1324 | if (fc->fcoe_pending_queue.qlen && !timer_pending(&fc->timer)) |
| 1325 | mod_timer(&fc->timer, jiffies + 2); |
Vasu Dev | c826a31 | 2009-02-27 10:56:27 -0800 | [diff] [blame] | 1326 | fc->fcoe_pending_queue_active = 0; |
Vasu Dev | c826a31 | 2009-02-27 10:56:27 -0800 | [diff] [blame] | 1327 | out: |
Vasu Dev | 4bb6b51 | 2009-05-06 10:52:34 -0700 | [diff] [blame] | 1328 | if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH) |
| 1329 | lp->qfull = 1; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1330 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); |
Vasu Dev | 4bb6b51 | 2009-05-06 10:52:34 -0700 | [diff] [blame] | 1331 | return; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1332 | } |
| 1333 | |
| 1334 | /** |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1335 | * fcoe_dev_setup() - setup link change notification interface |
| 1336 | */ |
Randy Dunlap | b0d428a | 2009-04-27 21:49:31 -0700 | [diff] [blame] | 1337 | static void fcoe_dev_setup(void) |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1338 | { |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1339 | register_netdevice_notifier(&fcoe_notifier); |
| 1340 | } |
| 1341 | |
| 1342 | /** |
Randy Dunlap | b0d428a | 2009-04-27 21:49:31 -0700 | [diff] [blame] | 1343 | * fcoe_dev_cleanup() - cleanup link change notification interface |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1344 | */ |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1345 | static void fcoe_dev_cleanup(void) |
| 1346 | { |
| 1347 | unregister_netdevice_notifier(&fcoe_notifier); |
| 1348 | } |
| 1349 | |
| 1350 | /** |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1351 | * fcoe_device_notification() - netdev event notification callback |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1352 | * @notifier: context of the notification |
| 1353 | * @event: type of event |
| 1354 | * @ptr: fixed array for output parsed ifname |
| 1355 | * |
| 1356 | * This function is called by the ethernet driver in case of link change event |
| 1357 | * |
| 1358 | * Returns: 0 for success |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1359 | */ |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1360 | static int fcoe_device_notification(struct notifier_block *notifier, |
| 1361 | ulong event, void *ptr) |
| 1362 | { |
| 1363 | struct fc_lport *lp = NULL; |
| 1364 | struct net_device *real_dev = ptr; |
| 1365 | struct fcoe_softc *fc; |
| 1366 | struct fcoe_dev_stats *stats; |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 1367 | u32 link_possible = 1; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1368 | u32 mfs; |
| 1369 | int rc = NOTIFY_OK; |
| 1370 | |
| 1371 | read_lock(&fcoe_hostlist_lock); |
| 1372 | list_for_each_entry(fc, &fcoe_hostlist, list) { |
| 1373 | if (fc->real_dev == real_dev) { |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 1374 | lp = fc->ctlr.lp; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1375 | break; |
| 1376 | } |
| 1377 | } |
| 1378 | read_unlock(&fcoe_hostlist_lock); |
| 1379 | if (lp == NULL) { |
| 1380 | rc = NOTIFY_DONE; |
| 1381 | goto out; |
| 1382 | } |
| 1383 | |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1384 | switch (event) { |
| 1385 | case NETDEV_DOWN: |
| 1386 | case NETDEV_GOING_DOWN: |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 1387 | link_possible = 0; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1388 | break; |
| 1389 | case NETDEV_UP: |
| 1390 | case NETDEV_CHANGE: |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1391 | break; |
| 1392 | case NETDEV_CHANGEMTU: |
| 1393 | mfs = fc->real_dev->mtu - |
| 1394 | (sizeof(struct fcoe_hdr) + |
| 1395 | sizeof(struct fcoe_crc_eof)); |
| 1396 | if (mfs >= FC_MIN_MAX_FRAME) |
| 1397 | fc_set_mfs(lp, mfs); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1398 | break; |
| 1399 | case NETDEV_REGISTER: |
| 1400 | break; |
| 1401 | default: |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 1402 | FC_DBG("Unknown event %ld from netdev netlink\n", event); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1403 | } |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 1404 | if (link_possible && !fcoe_link_ok(lp)) |
| 1405 | fcoe_ctlr_link_up(&fc->ctlr); |
| 1406 | else if (fcoe_ctlr_link_down(&fc->ctlr)) { |
| 1407 | stats = fc_lport_get_stats(lp); |
| 1408 | stats->LinkFailureCount++; |
| 1409 | fcoe_clean_pending_queue(lp); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1410 | } |
| 1411 | out: |
| 1412 | return rc; |
| 1413 | } |
| 1414 | |
| 1415 | /** |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1416 | * fcoe_if_to_netdev() - parse a name buffer to get netdev |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1417 | * @buffer: incoming buffer to be copied |
| 1418 | * |
Chris Leech | dd3fd72 | 2009-04-21 16:27:36 -0700 | [diff] [blame] | 1419 | * Returns: NULL or ptr to net_device |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1420 | */ |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1421 | static struct net_device *fcoe_if_to_netdev(const char *buffer) |
| 1422 | { |
| 1423 | char *cp; |
| 1424 | char ifname[IFNAMSIZ + 2]; |
| 1425 | |
| 1426 | if (buffer) { |
| 1427 | strlcpy(ifname, buffer, IFNAMSIZ); |
| 1428 | cp = ifname + strlen(ifname); |
| 1429 | while (--cp >= ifname && *cp == '\n') |
| 1430 | *cp = '\0'; |
| 1431 | return dev_get_by_name(&init_net, ifname); |
| 1432 | } |
| 1433 | return NULL; |
| 1434 | } |
| 1435 | |
| 1436 | /** |
Chris Leech | dd3fd72 | 2009-04-21 16:27:36 -0700 | [diff] [blame] | 1437 | * fcoe_netdev_to_module_owner() - finds out the driver module of the netdev |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1438 | * @netdev: the target netdev |
| 1439 | * |
| 1440 | * Returns: ptr to the struct module, NULL for failure |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1441 | */ |
Robert Love | b2ab99c | 2009-02-27 10:55:50 -0800 | [diff] [blame] | 1442 | static struct module * |
| 1443 | fcoe_netdev_to_module_owner(const struct net_device *netdev) |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1444 | { |
| 1445 | struct device *dev; |
| 1446 | |
| 1447 | if (!netdev) |
| 1448 | return NULL; |
| 1449 | |
| 1450 | dev = netdev->dev.parent; |
| 1451 | if (!dev) |
| 1452 | return NULL; |
| 1453 | |
| 1454 | if (!dev->driver) |
| 1455 | return NULL; |
| 1456 | |
| 1457 | return dev->driver->owner; |
| 1458 | } |
| 1459 | |
| 1460 | /** |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1461 | * fcoe_ethdrv_get() - Hold the Ethernet driver |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1462 | * @netdev: the target netdev |
| 1463 | * |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1464 | * Holds the Ethernet driver module by try_module_get() for |
| 1465 | * the corresponding netdev. |
| 1466 | * |
Chris Leech | dd3fd72 | 2009-04-21 16:27:36 -0700 | [diff] [blame] | 1467 | * Returns: 0 for success |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1468 | */ |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1469 | static int fcoe_ethdrv_get(const struct net_device *netdev) |
| 1470 | { |
| 1471 | struct module *owner; |
| 1472 | |
| 1473 | owner = fcoe_netdev_to_module_owner(netdev); |
| 1474 | if (owner) { |
James Bottomley | 56b854b | 2008-12-29 15:45:41 -0600 | [diff] [blame] | 1475 | printk(KERN_DEBUG "fcoe:hold driver module %s for %s\n", |
| 1476 | module_name(owner), netdev->name); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1477 | return try_module_get(owner); |
| 1478 | } |
| 1479 | return -ENODEV; |
| 1480 | } |
| 1481 | |
| 1482 | /** |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1483 | * fcoe_ethdrv_put() - Release the Ethernet driver |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1484 | * @netdev: the target netdev |
| 1485 | * |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1486 | * Releases the Ethernet driver module by module_put for |
| 1487 | * the corresponding netdev. |
| 1488 | * |
Chris Leech | dd3fd72 | 2009-04-21 16:27:36 -0700 | [diff] [blame] | 1489 | * Returns: 0 for success |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1490 | */ |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1491 | static int fcoe_ethdrv_put(const struct net_device *netdev) |
| 1492 | { |
| 1493 | struct module *owner; |
| 1494 | |
| 1495 | owner = fcoe_netdev_to_module_owner(netdev); |
| 1496 | if (owner) { |
James Bottomley | 56b854b | 2008-12-29 15:45:41 -0600 | [diff] [blame] | 1497 | printk(KERN_DEBUG "fcoe:release driver module %s for %s\n", |
| 1498 | module_name(owner), netdev->name); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1499 | module_put(owner); |
| 1500 | return 0; |
| 1501 | } |
| 1502 | return -ENODEV; |
| 1503 | } |
| 1504 | |
| 1505 | /** |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1506 | * fcoe_destroy() - handles the destroy from sysfs |
Chris Leech | dd3fd72 | 2009-04-21 16:27:36 -0700 | [diff] [blame] | 1507 | * @buffer: expected to be an eth if name |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1508 | * @kp: associated kernel param |
| 1509 | * |
| 1510 | * Returns: 0 for success |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1511 | */ |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1512 | static int fcoe_destroy(const char *buffer, struct kernel_param *kp) |
| 1513 | { |
| 1514 | int rc; |
| 1515 | struct net_device *netdev; |
| 1516 | |
| 1517 | netdev = fcoe_if_to_netdev(buffer); |
| 1518 | if (!netdev) { |
| 1519 | rc = -ENODEV; |
| 1520 | goto out_nodev; |
| 1521 | } |
| 1522 | /* look for existing lport */ |
| 1523 | if (!fcoe_hostlist_lookup(netdev)) { |
| 1524 | rc = -ENODEV; |
| 1525 | goto out_putdev; |
| 1526 | } |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 1527 | rc = fcoe_if_destroy(netdev); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1528 | if (rc) { |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 1529 | printk(KERN_ERR "fcoe: fcoe_if_destroy(%s) failed\n", |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1530 | netdev->name); |
| 1531 | rc = -EIO; |
| 1532 | goto out_putdev; |
| 1533 | } |
| 1534 | fcoe_ethdrv_put(netdev); |
| 1535 | rc = 0; |
| 1536 | out_putdev: |
| 1537 | dev_put(netdev); |
| 1538 | out_nodev: |
| 1539 | return rc; |
| 1540 | } |
| 1541 | |
| 1542 | /** |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1543 | * fcoe_create() - Handles the create call from sysfs |
Chris Leech | dd3fd72 | 2009-04-21 16:27:36 -0700 | [diff] [blame] | 1544 | * @buffer: expected to be an eth if name |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1545 | * @kp: associated kernel param |
| 1546 | * |
| 1547 | * Returns: 0 for success |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1548 | */ |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1549 | static int fcoe_create(const char *buffer, struct kernel_param *kp) |
| 1550 | { |
| 1551 | int rc; |
| 1552 | struct net_device *netdev; |
| 1553 | |
| 1554 | netdev = fcoe_if_to_netdev(buffer); |
| 1555 | if (!netdev) { |
| 1556 | rc = -ENODEV; |
| 1557 | goto out_nodev; |
| 1558 | } |
| 1559 | /* look for existing lport */ |
| 1560 | if (fcoe_hostlist_lookup(netdev)) { |
| 1561 | rc = -EEXIST; |
| 1562 | goto out_putdev; |
| 1563 | } |
| 1564 | fcoe_ethdrv_get(netdev); |
| 1565 | |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 1566 | rc = fcoe_if_create(netdev); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1567 | if (rc) { |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 1568 | printk(KERN_ERR "fcoe: fcoe_if_create(%s) failed\n", |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1569 | netdev->name); |
| 1570 | fcoe_ethdrv_put(netdev); |
| 1571 | rc = -EIO; |
| 1572 | goto out_putdev; |
| 1573 | } |
| 1574 | rc = 0; |
| 1575 | out_putdev: |
| 1576 | dev_put(netdev); |
| 1577 | out_nodev: |
| 1578 | return rc; |
| 1579 | } |
| 1580 | |
| 1581 | module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR); |
| 1582 | __MODULE_PARM_TYPE(create, "string"); |
| 1583 | MODULE_PARM_DESC(create, "Create fcoe port using net device passed in."); |
| 1584 | module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR); |
| 1585 | __MODULE_PARM_TYPE(destroy, "string"); |
| 1586 | MODULE_PARM_DESC(destroy, "Destroy fcoe port"); |
| 1587 | |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1588 | /** |
| 1589 | * fcoe_link_ok() - Check if link is ok for the fc_lport |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1590 | * @lp: ptr to the fc_lport |
| 1591 | * |
| 1592 | * Any permanently-disqualifying conditions have been previously checked. |
| 1593 | * This also updates the speed setting, which may change with link for 100/1000. |
| 1594 | * |
| 1595 | * This function should probably be checking for PAUSE support at some point |
| 1596 | * in the future. Currently Per-priority-pause is not determinable using |
| 1597 | * ethtool, so we shouldn't be restrictive until that problem is resolved. |
| 1598 | * |
| 1599 | * Returns: 0 if link is OK for use by FCoE. |
| 1600 | * |
| 1601 | */ |
| 1602 | int fcoe_link_ok(struct fc_lport *lp) |
| 1603 | { |
Robert Love | fc47ff6 | 2009-02-27 10:55:55 -0800 | [diff] [blame] | 1604 | struct fcoe_softc *fc = lport_priv(lp); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1605 | struct net_device *dev = fc->real_dev; |
| 1606 | struct ethtool_cmd ecmd = { ETHTOOL_GSET }; |
| 1607 | int rc = 0; |
| 1608 | |
| 1609 | if ((dev->flags & IFF_UP) && netif_carrier_ok(dev)) { |
| 1610 | dev = fc->phys_dev; |
| 1611 | if (dev->ethtool_ops->get_settings) { |
| 1612 | dev->ethtool_ops->get_settings(dev, &ecmd); |
| 1613 | lp->link_supported_speeds &= |
| 1614 | ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT); |
| 1615 | if (ecmd.supported & (SUPPORTED_1000baseT_Half | |
| 1616 | SUPPORTED_1000baseT_Full)) |
| 1617 | lp->link_supported_speeds |= FC_PORTSPEED_1GBIT; |
| 1618 | if (ecmd.supported & SUPPORTED_10000baseT_Full) |
| 1619 | lp->link_supported_speeds |= |
| 1620 | FC_PORTSPEED_10GBIT; |
| 1621 | if (ecmd.speed == SPEED_1000) |
| 1622 | lp->link_speed = FC_PORTSPEED_1GBIT; |
| 1623 | if (ecmd.speed == SPEED_10000) |
| 1624 | lp->link_speed = FC_PORTSPEED_10GBIT; |
| 1625 | } |
| 1626 | } else |
| 1627 | rc = -1; |
| 1628 | |
| 1629 | return rc; |
| 1630 | } |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1631 | |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1632 | /** |
| 1633 | * fcoe_percpu_clean() - Clear the pending skbs for an lport |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1634 | * @lp: the fc_lport |
| 1635 | */ |
| 1636 | void fcoe_percpu_clean(struct fc_lport *lp) |
| 1637 | { |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1638 | struct fcoe_percpu_s *pp; |
| 1639 | struct fcoe_rcv_info *fr; |
| 1640 | struct sk_buff_head *list; |
| 1641 | struct sk_buff *skb, *next; |
| 1642 | struct sk_buff *head; |
Robert Love | 5e5e92d | 2009-03-17 11:41:35 -0700 | [diff] [blame] | 1643 | unsigned int cpu; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1644 | |
Robert Love | 5e5e92d | 2009-03-17 11:41:35 -0700 | [diff] [blame] | 1645 | for_each_possible_cpu(cpu) { |
| 1646 | pp = &per_cpu(fcoe_percpu, cpu); |
| 1647 | spin_lock_bh(&pp->fcoe_rx_list.lock); |
| 1648 | list = &pp->fcoe_rx_list; |
| 1649 | head = list->next; |
| 1650 | for (skb = head; skb != (struct sk_buff *)list; |
| 1651 | skb = next) { |
| 1652 | next = skb->next; |
| 1653 | fr = fcoe_dev_from_skb(skb); |
| 1654 | if (fr->fr_dev == lp) { |
| 1655 | __skb_unlink(skb, list); |
| 1656 | kfree_skb(skb); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1657 | } |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1658 | } |
Robert Love | 5e5e92d | 2009-03-17 11:41:35 -0700 | [diff] [blame] | 1659 | spin_unlock_bh(&pp->fcoe_rx_list.lock); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1660 | } |
| 1661 | } |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1662 | |
| 1663 | /** |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1664 | * fcoe_clean_pending_queue() - Dequeue a skb and free it |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1665 | * @lp: the corresponding fc_lport |
| 1666 | * |
| 1667 | * Returns: none |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1668 | */ |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1669 | void fcoe_clean_pending_queue(struct fc_lport *lp) |
| 1670 | { |
| 1671 | struct fcoe_softc *fc = lport_priv(lp); |
| 1672 | struct sk_buff *skb; |
| 1673 | |
| 1674 | spin_lock_bh(&fc->fcoe_pending_queue.lock); |
| 1675 | while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) { |
| 1676 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); |
| 1677 | kfree_skb(skb); |
| 1678 | spin_lock_bh(&fc->fcoe_pending_queue.lock); |
| 1679 | } |
| 1680 | spin_unlock_bh(&fc->fcoe_pending_queue.lock); |
| 1681 | } |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1682 | |
| 1683 | /** |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1684 | * fcoe_reset() - Resets the fcoe |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1685 | * @shost: shost the reset is from |
| 1686 | * |
| 1687 | * Returns: always 0 |
| 1688 | */ |
| 1689 | int fcoe_reset(struct Scsi_Host *shost) |
| 1690 | { |
| 1691 | struct fc_lport *lport = shost_priv(shost); |
| 1692 | fc_lport_reset(lport); |
| 1693 | return 0; |
| 1694 | } |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1695 | |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1696 | /** |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1697 | * fcoe_hostlist_lookup_softc() - find the corresponding lport by a given device |
Chris Leech | dd3fd72 | 2009-04-21 16:27:36 -0700 | [diff] [blame] | 1698 | * @dev: this is currently ptr to net_device |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1699 | * |
| 1700 | * Returns: NULL or the located fcoe_softc |
| 1701 | */ |
Robert Love | b2ab99c | 2009-02-27 10:55:50 -0800 | [diff] [blame] | 1702 | static struct fcoe_softc * |
| 1703 | fcoe_hostlist_lookup_softc(const struct net_device *dev) |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1704 | { |
| 1705 | struct fcoe_softc *fc; |
| 1706 | |
| 1707 | read_lock(&fcoe_hostlist_lock); |
| 1708 | list_for_each_entry(fc, &fcoe_hostlist, list) { |
| 1709 | if (fc->real_dev == dev) { |
| 1710 | read_unlock(&fcoe_hostlist_lock); |
| 1711 | return fc; |
| 1712 | } |
| 1713 | } |
| 1714 | read_unlock(&fcoe_hostlist_lock); |
| 1715 | return NULL; |
| 1716 | } |
| 1717 | |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1718 | /** |
| 1719 | * fcoe_hostlist_lookup() - Find the corresponding lport by netdev |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1720 | * @netdev: ptr to net_device |
| 1721 | * |
| 1722 | * Returns: 0 for success |
| 1723 | */ |
| 1724 | struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev) |
| 1725 | { |
| 1726 | struct fcoe_softc *fc; |
| 1727 | |
| 1728 | fc = fcoe_hostlist_lookup_softc(netdev); |
| 1729 | |
Joe Eykholt | 97c8389 | 2009-03-17 11:42:40 -0700 | [diff] [blame] | 1730 | return (fc) ? fc->ctlr.lp : NULL; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1731 | } |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1732 | |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1733 | /** |
| 1734 | * fcoe_hostlist_add() - Add a lport to lports list |
Chris Leech | dd3fd72 | 2009-04-21 16:27:36 -0700 | [diff] [blame] | 1735 | * @lp: ptr to the fc_lport to be added |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1736 | * |
| 1737 | * Returns: 0 for success |
| 1738 | */ |
| 1739 | int fcoe_hostlist_add(const struct fc_lport *lp) |
| 1740 | { |
| 1741 | struct fcoe_softc *fc; |
| 1742 | |
| 1743 | fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp)); |
| 1744 | if (!fc) { |
Robert Love | fc47ff6 | 2009-02-27 10:55:55 -0800 | [diff] [blame] | 1745 | fc = lport_priv(lp); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1746 | write_lock_bh(&fcoe_hostlist_lock); |
| 1747 | list_add_tail(&fc->list, &fcoe_hostlist); |
| 1748 | write_unlock_bh(&fcoe_hostlist_lock); |
| 1749 | } |
| 1750 | return 0; |
| 1751 | } |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1752 | |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1753 | /** |
| 1754 | * fcoe_hostlist_remove() - remove a lport from lports list |
Chris Leech | dd3fd72 | 2009-04-21 16:27:36 -0700 | [diff] [blame] | 1755 | * @lp: ptr to the fc_lport to be removed |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1756 | * |
| 1757 | * Returns: 0 for success |
| 1758 | */ |
| 1759 | int fcoe_hostlist_remove(const struct fc_lport *lp) |
| 1760 | { |
| 1761 | struct fcoe_softc *fc; |
| 1762 | |
| 1763 | fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp)); |
| 1764 | BUG_ON(!fc); |
| 1765 | write_lock_bh(&fcoe_hostlist_lock); |
| 1766 | list_del(&fc->list); |
| 1767 | write_unlock_bh(&fcoe_hostlist_lock); |
| 1768 | |
| 1769 | return 0; |
| 1770 | } |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1771 | |
| 1772 | /** |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1773 | * fcoe_init() - fcoe module loading initialization |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1774 | * |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1775 | * Returns 0 on success, negative on failure |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1776 | */ |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1777 | static int __init fcoe_init(void) |
| 1778 | { |
Robert Love | 38eccab | 2009-03-17 11:41:30 -0700 | [diff] [blame] | 1779 | unsigned int cpu; |
Robert Love | 8976f42 | 2009-03-17 11:41:46 -0700 | [diff] [blame] | 1780 | int rc = 0; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1781 | struct fcoe_percpu_s *p; |
| 1782 | |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1783 | INIT_LIST_HEAD(&fcoe_hostlist); |
| 1784 | rwlock_init(&fcoe_hostlist_lock); |
| 1785 | |
Robert Love | 38eccab | 2009-03-17 11:41:30 -0700 | [diff] [blame] | 1786 | for_each_possible_cpu(cpu) { |
Robert Love | 5e5e92d | 2009-03-17 11:41:35 -0700 | [diff] [blame] | 1787 | p = &per_cpu(fcoe_percpu, cpu); |
Robert Love | 38eccab | 2009-03-17 11:41:30 -0700 | [diff] [blame] | 1788 | skb_queue_head_init(&p->fcoe_rx_list); |
| 1789 | } |
| 1790 | |
Robert Love | 8976f42 | 2009-03-17 11:41:46 -0700 | [diff] [blame] | 1791 | for_each_online_cpu(cpu) |
| 1792 | fcoe_percpu_thread_create(cpu); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1793 | |
Robert Love | 8976f42 | 2009-03-17 11:41:46 -0700 | [diff] [blame] | 1794 | /* Initialize per CPU interrupt thread */ |
| 1795 | rc = register_hotcpu_notifier(&fcoe_cpu_notifier); |
| 1796 | if (rc) |
| 1797 | goto out_free; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1798 | |
Robert Love | 8976f42 | 2009-03-17 11:41:46 -0700 | [diff] [blame] | 1799 | /* Setup link change notification */ |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1800 | fcoe_dev_setup(); |
| 1801 | |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 1802 | fcoe_if_init(); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1803 | |
| 1804 | return 0; |
Robert Love | 8976f42 | 2009-03-17 11:41:46 -0700 | [diff] [blame] | 1805 | |
| 1806 | out_free: |
| 1807 | for_each_online_cpu(cpu) { |
| 1808 | fcoe_percpu_thread_destroy(cpu); |
| 1809 | } |
| 1810 | |
| 1811 | return rc; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1812 | } |
| 1813 | module_init(fcoe_init); |
| 1814 | |
| 1815 | /** |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1816 | * fcoe_exit() - fcoe module unloading cleanup |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1817 | * |
| 1818 | * Returns 0 on success, negative on failure |
Robert Love | 34f42a0 | 2009-02-27 10:55:45 -0800 | [diff] [blame] | 1819 | */ |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1820 | static void __exit fcoe_exit(void) |
| 1821 | { |
Robert Love | 5e5e92d | 2009-03-17 11:41:35 -0700 | [diff] [blame] | 1822 | unsigned int cpu; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1823 | struct fcoe_softc *fc, *tmp; |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1824 | |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1825 | fcoe_dev_cleanup(); |
| 1826 | |
Vasu Dev | 5919a59 | 2009-03-27 09:03:29 -0700 | [diff] [blame] | 1827 | /* releases the associated fcoe hosts */ |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1828 | list_for_each_entry_safe(fc, tmp, &fcoe_hostlist, list) |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 1829 | fcoe_if_destroy(fc->real_dev); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1830 | |
Robert Love | 8976f42 | 2009-03-17 11:41:46 -0700 | [diff] [blame] | 1831 | unregister_hotcpu_notifier(&fcoe_cpu_notifier); |
| 1832 | |
| 1833 | for_each_online_cpu(cpu) { |
| 1834 | fcoe_percpu_thread_destroy(cpu); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1835 | } |
| 1836 | |
Vasu Dev | 7f34914 | 2009-03-27 09:06:31 -0700 | [diff] [blame] | 1837 | /* detach from scsi transport */ |
| 1838 | fcoe_if_exit(); |
Robert Love | 85b4aa4 | 2008-12-09 15:10:24 -0800 | [diff] [blame] | 1839 | } |
| 1840 | module_exit(fcoe_exit); |