1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (c) 2008-2009 Cisco Systems, Inc. All rights reserved. 4 * Copyright (c) 2007-2008 Intel Corporation. All rights reserved. 5 * 6 * Maintained at www.Open-FCoE.org 7 */ 8 9 #ifndef _LIBFCOE_H 10 #define _LIBFCOE_H 11 12 #include <linux/etherdevice.h> 13 #include <linux/if_ether.h> 14 #include <linux/netdevice.h> 15 #include <linux/skbuff.h> 16 #include <linux/workqueue.h> 17 #include <linux/random.h> 18 #include <scsi/fc/fc_fcoe.h> 19 #include <scsi/libfc.h> 20 #include <scsi/fcoe_sysfs.h> 21 22 #define FCOE_MAX_CMD_LEN 16 /* Supported CDB length */ 23 24 /* 25 * Max MTU for FCoE: 14 (FCoE header) + 24 (FC header) + 2112 (max FC payload) 26 * + 4 (FC CRC) + 4 (FCoE trailer) = 2158 bytes 27 */ 28 #define FCOE_MTU 2158 29 30 /* 31 * FIP tunable parameters. 32 */ 33 #define FCOE_CTLR_START_DELAY 2000 /* mS after first adv. to choose FCF */ 34 #define FCOE_CTRL_SOL_TOV 2000 /* min. solicitation interval (mS) */ 35 #define FCOE_CTLR_FCF_LIMIT 20 /* max. number of FCF entries */ 36 #define FCOE_CTLR_VN2VN_LOGIN_LIMIT 3 /* max. VN2VN rport login retries */ 37 38 /** 39 * enum fip_state - internal state of FCoE controller. 40 * @FIP_ST_DISABLED: controller has been disabled or not yet enabled. 41 * @FIP_ST_LINK_WAIT: the physical link is down or unusable. 42 * @FIP_ST_AUTO: determining whether to use FIP or non-FIP mode. 43 * @FIP_ST_NON_FIP: non-FIP mode selected. 44 * @FIP_ST_ENABLED: FIP mode selected. 45 * @FIP_ST_VNMP_START: VN2VN multipath mode start, wait 46 * @FIP_ST_VNMP_PROBE1: VN2VN sent first probe, listening 47 * @FIP_ST_VNMP_PROBE2: VN2VN sent second probe, listening 48 * @FIP_ST_VNMP_CLAIM: VN2VN sent claim, waiting for responses 49 * @FIP_ST_VNMP_UP: VN2VN multipath mode operation 50 */ 51 enum fip_state { 52 FIP_ST_DISABLED, 53 FIP_ST_LINK_WAIT, 54 FIP_ST_AUTO, 55 FIP_ST_NON_FIP, 56 FIP_ST_ENABLED, 57 FIP_ST_VNMP_START, 58 FIP_ST_VNMP_PROBE1, 59 FIP_ST_VNMP_PROBE2, 60 FIP_ST_VNMP_CLAIM, 61 FIP_ST_VNMP_UP, 62 }; 63 64 /* 65 * Modes: 66 * The mode is the state that is to be entered after link up. 67 * It must not change after fcoe_ctlr_init() sets it. 68 */ 69 enum fip_mode { 70 FIP_MODE_AUTO, 71 FIP_MODE_NON_FIP, 72 FIP_MODE_FABRIC, 73 FIP_MODE_VN2VN, 74 }; 75 76 /** 77 * struct fcoe_ctlr - FCoE Controller and FIP state 78 * @state: internal FIP state for network link and FIP or non-FIP mode. 79 * @mode: LLD-selected mode. 80 * @lp: &fc_lport: libfc local port. 81 * @sel_fcf: currently selected FCF, or NULL. 82 * @fcfs: list of discovered FCFs. 83 * @cdev: (Optional) pointer to sysfs fcoe_ctlr_device. 84 * @fcf_count: number of discovered FCF entries. 85 * @sol_time: time when a multicast solicitation was last sent. 86 * @sel_time: time after which to select an FCF. 87 * @port_ka_time: time of next port keep-alive. 88 * @ctlr_ka_time: time of next controller keep-alive. 89 * @timer: timer struct used for all delayed events. 90 * @timer_work: &work_struct for doing keep-alives and resets. 91 * @recv_work: &work_struct for receiving FIP frames. 92 * @fip_recv_list: list of received FIP frames. 93 * @flogi_req: clone of FLOGI request sent 94 * @rnd_state: state for pseudo-random number generator. 95 * @port_id: proposed or selected local-port ID. 96 * @user_mfs: configured maximum FC frame size, including FC header. 97 * @flogi_oxid: exchange ID of most recent fabric login. 98 * @flogi_req_send: send of FLOGI requested 99 * @flogi_count: number of FLOGI attempts in AUTO mode. 100 * @map_dest: use the FC_MAP mode for destination MAC addresses. 101 * @fip_resp: start FIP VLAN discovery responder 102 * @spma: supports SPMA server-provided MACs mode 103 * @probe_tries: number of FC_IDs probed 104 * @priority: DCBx FCoE APP priority 105 * @dest_addr: MAC address of the selected FC forwarder. 106 * @ctl_src_addr: the native MAC address of our local port. 107 * @send: LLD-supplied function to handle sending FIP Ethernet frames 108 * @update_mac: LLD-supplied function to handle changes to MAC addresses. 109 * @get_src_addr: LLD-supplied function to supply a source MAC address. 110 * @ctlr_mutex: lock protecting this structure. 111 * @ctlr_lock: spinlock covering flogi_req 112 * 113 * This structure is used by all FCoE drivers. It contains information 114 * needed by all FCoE low-level drivers (LLDs) as well as internal state 115 * for FIP, and fields shared with the LLDS. 116 */ 117 struct fcoe_ctlr { 118 enum fip_state state; 119 enum fip_mode mode; 120 struct fc_lport *lp; 121 struct fcoe_fcf *sel_fcf; 122 struct list_head fcfs; 123 struct fcoe_ctlr_device *cdev; 124 u16 fcf_count; 125 unsigned long sol_time; 126 unsigned long sel_time; 127 unsigned long port_ka_time; 128 unsigned long ctlr_ka_time; 129 struct timer_list timer; 130 struct work_struct timer_work; 131 struct work_struct recv_work; 132 struct sk_buff_head fip_recv_list; 133 struct sk_buff *flogi_req; 134 135 struct rnd_state rnd_state; 136 u32 port_id; 137 138 u16 user_mfs; 139 u16 flogi_oxid; 140 u8 flogi_req_send; 141 u8 flogi_count; 142 bool map_dest; 143 bool fip_resp; 144 u8 spma; 145 u8 probe_tries; 146 u8 priority; 147 u8 dest_addr[ETH_ALEN]; 148 u8 ctl_src_addr[ETH_ALEN]; 149 150 void (*send)(struct fcoe_ctlr *, struct sk_buff *); 151 void (*update_mac)(struct fc_lport *, u8 *addr); 152 u8 * (*get_src_addr)(struct fc_lport *); 153 struct mutex ctlr_mutex; 154 spinlock_t ctlr_lock; 155 }; 156 157 /** 158 * fcoe_ctlr_priv() - Return the private data from a fcoe_ctlr 159 * @cltr: The fcoe_ctlr whose private data will be returned 160 */ 161 static inline void *fcoe_ctlr_priv(const struct fcoe_ctlr *ctlr) 162 { 163 return (void *)(ctlr + 1); 164 } 165 166 /* 167 * This assumes that the fcoe_ctlr (x) is allocated with the fcoe_ctlr_device. 168 */ 169 #define fcoe_ctlr_to_ctlr_dev(x) \ 170 (x)->cdev 171 172 /** 173 * struct fcoe_fcf - Fibre-Channel Forwarder 174 * @list: list linkage 175 * @event_work: Work for FC Transport actions queue 176 * @event: The event to be processed 177 * @fip: The controller that the FCF was discovered on 178 * @fcf_dev: The associated fcoe_fcf_device instance 179 * @time: system time (jiffies) when an advertisement was last received 180 * @switch_name: WWN of switch from advertisement 181 * @fabric_name: WWN of fabric from advertisement 182 * @fc_map: FC_MAP value from advertisement 183 * @fcf_mac: Ethernet address of the FCF for FIP traffic 184 * @fcoe_mac: Ethernet address of the FCF for FCoE traffic 185 * @vfid: virtual fabric ID 186 * @pri: selection priority, smaller values are better 187 * @flogi_sent: current FLOGI sent to this FCF 188 * @flags: flags received from advertisement 189 * @fka_period: keep-alive period, in jiffies 190 * 191 * A Fibre-Channel Forwarder (FCF) is the entity on the Ethernet that 192 * passes FCoE frames on to an FC fabric. This structure represents 193 * one FCF from which advertisements have been received. 194 * 195 * When looking up an FCF, @switch_name, @fabric_name, @fc_map, @vfid, and 196 * @fcf_mac together form the lookup key. 197 */ 198 struct fcoe_fcf { 199 struct list_head list; 200 struct work_struct event_work; 201 struct fcoe_ctlr *fip; 202 struct fcoe_fcf_device *fcf_dev; 203 unsigned long time; 204 205 u64 switch_name; 206 u64 fabric_name; 207 u32 fc_map; 208 u16 vfid; 209 u8 fcf_mac[ETH_ALEN]; 210 u8 fcoe_mac[ETH_ALEN]; 211 212 u8 pri; 213 u8 flogi_sent; 214 u16 flags; 215 u32 fka_period; 216 u8 fd_flags:1; 217 }; 218 219 #define fcoe_fcf_to_fcf_dev(x) \ 220 ((x)->fcf_dev) 221 222 /** 223 * struct fcoe_rport - VN2VN remote port 224 * @time: time of create or last beacon packet received from node 225 * @fcoe_len: max FCoE frame size, not including VLAN or Ethernet headers 226 * @flags: flags from probe or claim 227 * @login_count: number of unsuccessful rport logins to this port 228 * @enode_mac: E_Node control MAC address 229 * @vn_mac: VN_Node assigned MAC address for data 230 */ 231 struct fcoe_rport { 232 unsigned long time; 233 u16 fcoe_len; 234 u16 flags; 235 u8 login_count; 236 u8 enode_mac[ETH_ALEN]; 237 u8 vn_mac[ETH_ALEN]; 238 }; 239 240 /* FIP API functions */ 241 void fcoe_ctlr_init(struct fcoe_ctlr *, enum fip_mode); 242 void fcoe_ctlr_destroy(struct fcoe_ctlr *); 243 void fcoe_ctlr_link_up(struct fcoe_ctlr *); 244 int fcoe_ctlr_link_down(struct fcoe_ctlr *); 245 int fcoe_ctlr_els_send(struct fcoe_ctlr *, struct fc_lport *, struct sk_buff *); 246 void fcoe_ctlr_recv(struct fcoe_ctlr *, struct sk_buff *); 247 int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *, struct fc_lport *, 248 struct fc_frame *); 249 250 /* libfcoe funcs */ 251 u64 fcoe_wwn_from_mac(unsigned char mac[], unsigned int, unsigned int); 252 int fcoe_libfc_config(struct fc_lport *, struct fcoe_ctlr *, 253 const struct libfc_function_template *, int init_fcp); 254 u32 fcoe_fc_crc(struct fc_frame *fp); 255 int fcoe_start_io(struct sk_buff *skb); 256 int fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type); 257 void __fcoe_get_lesb(struct fc_lport *lport, struct fc_els_lesb *fc_lesb, 258 struct net_device *netdev); 259 void fcoe_wwn_to_str(u64 wwn, char *buf, int len); 260 int fcoe_validate_vport_create(struct fc_vport *vport); 261 int fcoe_link_speed_update(struct fc_lport *); 262 void fcoe_get_lesb(struct fc_lport *, struct fc_els_lesb *); 263 void fcoe_ctlr_get_lesb(struct fcoe_ctlr_device *ctlr_dev); 264 265 /** 266 * is_fip_mode() - returns true if FIP mode selected. 267 * @fip: FCoE controller. 268 */ 269 static inline bool is_fip_mode(struct fcoe_ctlr *fip) 270 { 271 return fip->state == FIP_ST_ENABLED; 272 } 273 274 /* helper for FCoE SW HBA drivers, can include subven and subdev if needed. The 275 * modpost would use pci_device_id table to auto-generate formatted module alias 276 * into the corresponding .mod.c file, but there may or may not be a pci device 277 * id table for FCoE drivers so we use the following helper for build the fcoe 278 * driver module alias. 279 */ 280 #define MODULE_ALIAS_FCOE_PCI(ven, dev) \ 281 MODULE_ALIAS("fcoe-pci:" \ 282 "v" __stringify(ven) \ 283 "d" __stringify(dev) "sv*sd*bc*sc*i*") 284 285 /* the name of the default FCoE transport driver fcoe.ko */ 286 #define FCOE_TRANSPORT_DEFAULT "fcoe" 287 288 /* struct fcoe_transport - The FCoE transport interface 289 * @name: a vendor specific name for their FCoE transport driver 290 * @attached: whether this transport is already attached 291 * @list: list linkage to all attached transports 292 * @match: handler to allow the transport driver to match up a given netdev 293 * @alloc: handler to allocate per-instance FCoE structures 294 * (no discovery or login) 295 * @create: handler to sysfs entry of create for FCoE instances 296 * @destroy: handler to delete per-instance FCoE structures 297 * (frees all memory) 298 * @enable: handler to sysfs entry of enable for FCoE instances 299 * @disable: handler to sysfs entry of disable for FCoE instances 300 */ 301 struct fcoe_transport { 302 char name[IFNAMSIZ]; 303 bool attached; 304 struct list_head list; 305 bool (*match) (struct net_device *device); 306 int (*alloc) (struct net_device *device); 307 int (*create) (struct net_device *device, enum fip_mode fip_mode); 308 int (*destroy) (struct net_device *device); 309 int (*enable) (struct net_device *device); 310 int (*disable) (struct net_device *device); 311 }; 312 313 /** 314 * struct fcoe_percpu_s - The context for FCoE receive thread(s) 315 * @kthread: The thread context (used by bnx2fc) 316 * @work: The work item (used by fcoe) 317 * @fcoe_rx_list: The queue of pending packets to process 318 * @page: The memory page for calculating frame trailer CRCs 319 * @crc_eof_offset: The offset into the CRC page pointing to available 320 * memory for a new trailer 321 */ 322 struct fcoe_percpu_s { 323 struct task_struct *kthread; 324 struct work_struct work; 325 struct sk_buff_head fcoe_rx_list; 326 struct page *crc_eof_page; 327 int crc_eof_offset; 328 }; 329 330 /** 331 * struct fcoe_port - The FCoE private structure 332 * @priv: The associated fcoe interface. The structure is 333 * defined by the low level driver 334 * @lport: The associated local port 335 * @fcoe_pending_queue: The pending Rx queue of skbs 336 * @fcoe_pending_queue_active: Indicates if the pending queue is active 337 * @max_queue_depth: Max queue depth of pending queue 338 * @min_queue_depth: Min queue depth of pending queue 339 * @timer: The queue timer 340 * @destroy_work: Handle for work context 341 * (to prevent RTNL deadlocks) 342 * @data_srt_addr: Source address for data 343 * 344 * An instance of this structure is to be allocated along with the 345 * Scsi_Host and libfc fc_lport structures. 346 */ 347 struct fcoe_port { 348 void *priv; 349 struct fc_lport *lport; 350 struct sk_buff_head fcoe_pending_queue; 351 u8 fcoe_pending_queue_active; 352 u32 max_queue_depth; 353 u32 min_queue_depth; 354 struct timer_list timer; 355 struct work_struct destroy_work; 356 u8 data_src_addr[ETH_ALEN]; 357 struct net_device * (*get_netdev)(const struct fc_lport *lport); 358 }; 359 360 /** 361 * fcoe_get_netdev() - Return the net device associated with a local port 362 * @lport: The local port to get the net device from 363 */ 364 static inline struct net_device *fcoe_get_netdev(const struct fc_lport *lport) 365 { 366 struct fcoe_port *port = ((struct fcoe_port *)lport_priv(lport)); 367 368 return (port->get_netdev) ? port->get_netdev(lport) : NULL; 369 } 370 371 void fcoe_clean_pending_queue(struct fc_lport *); 372 void fcoe_check_wait_queue(struct fc_lport *lport, struct sk_buff *skb); 373 void fcoe_queue_timer(struct timer_list *t); 374 int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen, 375 struct fcoe_percpu_s *fps); 376 377 /* FCoE Sysfs helpers */ 378 void fcoe_fcf_get_selected(struct fcoe_fcf_device *); 379 void fcoe_ctlr_set_fip_mode(struct fcoe_ctlr_device *); 380 381 /** 382 * struct netdev_list 383 * A mapping from netdevice to fcoe_transport 384 */ 385 struct fcoe_netdev_mapping { 386 struct list_head list; 387 struct net_device *netdev; 388 struct fcoe_transport *ft; 389 }; 390 391 /* fcoe transports registration and deregistration */ 392 int fcoe_transport_attach(struct fcoe_transport *ft); 393 int fcoe_transport_detach(struct fcoe_transport *ft); 394 395 /* sysfs store handler for ctrl_control interface */ 396 ssize_t fcoe_ctlr_create_store(struct bus_type *bus, 397 const char *buf, size_t count); 398 ssize_t fcoe_ctlr_destroy_store(struct bus_type *bus, 399 const char *buf, size_t count); 400 401 #endif /* _LIBFCOE_H */ 402 403 404