smc_core.h (18201B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * Shared Memory Communications over RDMA (SMC-R) and RoCE 4 * 5 * Definitions for SMC Connections, Link Groups and Links 6 * 7 * Copyright IBM Corp. 2016 8 * 9 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> 10 */ 11 12#ifndef _SMC_CORE_H 13#define _SMC_CORE_H 14 15#include <linux/atomic.h> 16#include <linux/smc.h> 17#include <linux/pci.h> 18#include <rdma/ib_verbs.h> 19#include <net/genetlink.h> 20 21#include "smc.h" 22#include "smc_ib.h" 23 24#define SMC_RMBS_PER_LGR_MAX 255 /* max. # of RMBs per link group */ 25 26struct smc_lgr_list { /* list of link group definition */ 27 struct list_head list; 28 spinlock_t lock; /* protects list of link groups */ 29 u32 num; /* unique link group number */ 30}; 31 32enum smc_lgr_role { /* possible roles of a link group */ 33 SMC_CLNT, /* client */ 34 SMC_SERV /* server */ 35}; 36 37enum smc_link_state { /* possible states of a link */ 38 SMC_LNK_UNUSED, /* link is unused */ 39 SMC_LNK_INACTIVE, /* link is inactive */ 40 SMC_LNK_ACTIVATING, /* link is being activated */ 41 SMC_LNK_ACTIVE, /* link is active */ 42}; 43 44#define SMC_WR_BUF_SIZE 48 /* size of work request buffer */ 45#define SMC_WR_BUF_V2_SIZE 8192 /* size of v2 work request buffer */ 46 47struct smc_wr_buf { 48 u8 raw[SMC_WR_BUF_SIZE]; 49}; 50 51struct smc_wr_v2_buf { 52 u8 raw[SMC_WR_BUF_V2_SIZE]; 53}; 54 55#define SMC_WR_REG_MR_WAIT_TIME (5 * HZ)/* wait time for ib_wr_reg_mr result */ 56 57enum smc_wr_reg_state { 58 POSTED, /* ib_wr_reg_mr request posted */ 59 CONFIRMED, /* ib_wr_reg_mr response: successful */ 60 FAILED /* ib_wr_reg_mr response: failure */ 61}; 62 63struct smc_rdma_sge { /* sges for RDMA writes */ 64 struct ib_sge wr_tx_rdma_sge[SMC_IB_MAX_SEND_SGE]; 65}; 66 67#define SMC_MAX_RDMA_WRITES 2 /* max. # of RDMA writes per 68 * message send 69 */ 70 71struct smc_rdma_sges { /* sges per message send */ 72 struct smc_rdma_sge tx_rdma_sge[SMC_MAX_RDMA_WRITES]; 73}; 74 75struct smc_rdma_wr { /* work requests per message 76 * send 77 */ 78 struct ib_rdma_wr wr_tx_rdma[SMC_MAX_RDMA_WRITES]; 79}; 80 81#define SMC_LGR_ID_SIZE 4 82 83struct smc_link { 84 struct smc_ib_device *smcibdev; /* ib-device */ 85 u8 ibport; /* port - values 1 | 2 */ 86 struct ib_pd *roce_pd; /* IB protection domain, 87 * unique for every RoCE QP 88 */ 89 struct ib_qp *roce_qp; /* IB queue pair */ 90 struct ib_qp_attr qp_attr; /* IB queue pair attributes */ 91 92 struct smc_wr_buf *wr_tx_bufs; /* WR send payload buffers */ 93 struct ib_send_wr *wr_tx_ibs; /* WR send meta data */ 94 struct ib_sge *wr_tx_sges; /* WR send gather meta data */ 95 struct smc_rdma_sges *wr_tx_rdma_sges;/*RDMA WRITE gather meta data*/ 96 struct smc_rdma_wr *wr_tx_rdmas; /* WR RDMA WRITE */ 97 struct smc_wr_tx_pend *wr_tx_pends; /* WR send waiting for CQE */ 98 struct completion *wr_tx_compl; /* WR send CQE completion */ 99 /* above four vectors have wr_tx_cnt elements and use the same index */ 100 struct ib_send_wr *wr_tx_v2_ib; /* WR send v2 meta data */ 101 struct ib_sge *wr_tx_v2_sge; /* WR send v2 gather meta data*/ 102 struct smc_wr_tx_pend *wr_tx_v2_pend; /* WR send v2 waiting for CQE */ 103 dma_addr_t wr_tx_dma_addr; /* DMA address of wr_tx_bufs */ 104 dma_addr_t wr_tx_v2_dma_addr; /* DMA address of v2 tx buf*/ 105 atomic_long_t wr_tx_id; /* seq # of last sent WR */ 106 unsigned long *wr_tx_mask; /* bit mask of used indexes */ 107 u32 wr_tx_cnt; /* number of WR send buffers */ 108 wait_queue_head_t wr_tx_wait; /* wait for free WR send buf */ 109 atomic_t wr_tx_refcnt; /* tx refs to link */ 110 111 struct smc_wr_buf *wr_rx_bufs; /* WR recv payload buffers */ 112 struct ib_recv_wr *wr_rx_ibs; /* WR recv meta data */ 113 struct ib_sge *wr_rx_sges; /* WR recv scatter meta data */ 114 /* above three vectors have wr_rx_cnt elements and use the same index */ 115 dma_addr_t wr_rx_dma_addr; /* DMA address of wr_rx_bufs */ 116 dma_addr_t wr_rx_v2_dma_addr; /* DMA address of v2 rx buf*/ 117 u64 wr_rx_id; /* seq # of last recv WR */ 118 u32 wr_rx_cnt; /* number of WR recv buffers */ 119 unsigned long wr_rx_tstamp; /* jiffies when last buf rx */ 120 121 struct ib_reg_wr wr_reg; /* WR register memory region */ 122 wait_queue_head_t wr_reg_wait; /* wait for wr_reg result */ 123 atomic_t wr_reg_refcnt; /* reg refs to link */ 124 enum smc_wr_reg_state wr_reg_state; /* state of wr_reg request */ 125 126 u8 gid[SMC_GID_SIZE];/* gid matching used vlan id*/ 127 u8 sgid_index; /* gid index for vlan id */ 128 u32 peer_qpn; /* QP number of peer */ 129 enum ib_mtu path_mtu; /* used mtu */ 130 enum ib_mtu peer_mtu; /* mtu size of peer */ 131 u32 psn_initial; /* QP tx initial packet seqno */ 132 u32 peer_psn; /* QP rx initial packet seqno */ 133 u8 peer_mac[ETH_ALEN]; /* = gid[8:10||13:15] */ 134 u8 peer_gid[SMC_GID_SIZE]; /* gid of peer*/ 135 u8 link_id; /* unique # within link group */ 136 u8 link_uid[SMC_LGR_ID_SIZE]; /* unique lnk id */ 137 u8 peer_link_uid[SMC_LGR_ID_SIZE]; /* peer uid */ 138 u8 link_idx; /* index in lgr link array */ 139 u8 link_is_asym; /* is link asymmetric? */ 140 u8 clearing : 1; /* link is being cleared */ 141 refcount_t refcnt; /* link reference count */ 142 struct smc_link_group *lgr; /* parent link group */ 143 struct work_struct link_down_wrk; /* wrk to bring link down */ 144 char ibname[IB_DEVICE_NAME_MAX]; /* ib device name */ 145 int ndev_ifidx; /* network device ifindex */ 146 147 enum smc_link_state state; /* state of link */ 148 struct delayed_work llc_testlink_wrk; /* testlink worker */ 149 struct completion llc_testlink_resp; /* wait for rx of testlink */ 150 int llc_testlink_time; /* testlink interval */ 151 atomic_t conn_cnt; /* connections on this link */ 152}; 153 154/* For now we just allow one parallel link per link group. The SMC protocol 155 * allows more (up to 8). 156 */ 157#define SMC_LINKS_PER_LGR_MAX 3 158#define SMC_SINGLE_LINK 0 159 160/* tx/rx buffer list element for sndbufs list and rmbs list of a lgr */ 161struct smc_buf_desc { 162 struct list_head list; 163 void *cpu_addr; /* virtual address of buffer */ 164 struct page *pages; 165 int len; /* length of buffer */ 166 u32 used; /* currently used / unused */ 167 union { 168 struct { /* SMC-R */ 169 struct sg_table sgt[SMC_LINKS_PER_LGR_MAX]; 170 /* virtual buffer */ 171 struct ib_mr *mr_rx[SMC_LINKS_PER_LGR_MAX]; 172 /* for rmb only: memory region 173 * incl. rkey provided to peer 174 */ 175 u32 order; /* allocation order */ 176 177 u8 is_conf_rkey; 178 /* confirm_rkey done */ 179 u8 is_reg_mr[SMC_LINKS_PER_LGR_MAX]; 180 /* mem region registered */ 181 u8 is_map_ib[SMC_LINKS_PER_LGR_MAX]; 182 /* mem region mapped to lnk */ 183 u8 is_reg_err; 184 /* buffer registration err */ 185 }; 186 struct { /* SMC-D */ 187 unsigned short sba_idx; 188 /* SBA index number */ 189 u64 token; 190 /* DMB token number */ 191 dma_addr_t dma_addr; 192 /* DMA address */ 193 }; 194 }; 195}; 196 197struct smc_rtoken { /* address/key of remote RMB */ 198 u64 dma_addr; 199 u32 rkey; 200}; 201 202#define SMC_BUF_MIN_SIZE 16384 /* minimum size of an RMB */ 203#define SMC_RMBE_SIZES 16 /* number of distinct RMBE sizes */ 204/* theoretically, the RFC states that largest size would be 512K, 205 * i.e. compressed 5 and thus 6 sizes (0..5), despite 206 * struct smc_clc_msg_accept_confirm.rmbe_size being a 4 bit value (0..15) 207 */ 208 209struct smcd_dev; 210 211enum smc_lgr_type { /* redundancy state of lgr */ 212 SMC_LGR_NONE, /* no active links, lgr to be deleted */ 213 SMC_LGR_SINGLE, /* 1 active RNIC on each peer */ 214 SMC_LGR_SYMMETRIC, /* 2 active RNICs on each peer */ 215 SMC_LGR_ASYMMETRIC_PEER, /* local has 2, peer 1 active RNICs */ 216 SMC_LGR_ASYMMETRIC_LOCAL, /* local has 1, peer 2 active RNICs */ 217}; 218 219enum smc_llc_flowtype { 220 SMC_LLC_FLOW_NONE = 0, 221 SMC_LLC_FLOW_ADD_LINK = 2, 222 SMC_LLC_FLOW_DEL_LINK = 4, 223 SMC_LLC_FLOW_REQ_ADD_LINK = 5, 224 SMC_LLC_FLOW_RKEY = 6, 225}; 226 227struct smc_llc_qentry; 228 229struct smc_llc_flow { 230 enum smc_llc_flowtype type; 231 struct smc_llc_qentry *qentry; 232}; 233 234struct smc_link_group { 235 struct list_head list; 236 struct rb_root conns_all; /* connection tree */ 237 rwlock_t conns_lock; /* protects conns_all */ 238 unsigned int conns_num; /* current # of connections */ 239 unsigned short vlan_id; /* vlan id of link group */ 240 241 struct list_head sndbufs[SMC_RMBE_SIZES];/* tx buffers */ 242 struct mutex sndbufs_lock; /* protects tx buffers */ 243 struct list_head rmbs[SMC_RMBE_SIZES]; /* rx buffers */ 244 struct mutex rmbs_lock; /* protects rx buffers */ 245 246 u8 id[SMC_LGR_ID_SIZE]; /* unique lgr id */ 247 struct delayed_work free_work; /* delayed freeing of an lgr */ 248 struct work_struct terminate_work; /* abnormal lgr termination */ 249 struct workqueue_struct *tx_wq; /* wq for conn. tx workers */ 250 u8 sync_err : 1; /* lgr no longer fits to peer */ 251 u8 terminating : 1;/* lgr is terminating */ 252 u8 freeing : 1; /* lgr is being freed */ 253 254 refcount_t refcnt; /* lgr reference count */ 255 bool is_smcd; /* SMC-R or SMC-D */ 256 u8 smc_version; 257 u8 negotiated_eid[SMC_MAX_EID_LEN]; 258 u8 peer_os; /* peer operating system */ 259 u8 peer_smc_release; 260 u8 peer_hostname[SMC_MAX_HOSTNAME_LEN]; 261 union { 262 struct { /* SMC-R */ 263 enum smc_lgr_role role; 264 /* client or server */ 265 struct smc_link lnk[SMC_LINKS_PER_LGR_MAX]; 266 /* smc link */ 267 struct smc_wr_v2_buf *wr_rx_buf_v2; 268 /* WR v2 recv payload buffer */ 269 struct smc_wr_v2_buf *wr_tx_buf_v2; 270 /* WR v2 send payload buffer */ 271 char peer_systemid[SMC_SYSTEMID_LEN]; 272 /* unique system_id of peer */ 273 struct smc_rtoken rtokens[SMC_RMBS_PER_LGR_MAX] 274 [SMC_LINKS_PER_LGR_MAX]; 275 /* remote addr/key pairs */ 276 DECLARE_BITMAP(rtokens_used_mask, SMC_RMBS_PER_LGR_MAX); 277 /* used rtoken elements */ 278 u8 next_link_id; 279 enum smc_lgr_type type; 280 /* redundancy state */ 281 u8 pnet_id[SMC_MAX_PNETID_LEN + 1]; 282 /* pnet id of this lgr */ 283 struct list_head llc_event_q; 284 /* queue for llc events */ 285 spinlock_t llc_event_q_lock; 286 /* protects llc_event_q */ 287 struct mutex llc_conf_mutex; 288 /* protects lgr reconfig. */ 289 struct work_struct llc_add_link_work; 290 struct work_struct llc_del_link_work; 291 struct work_struct llc_event_work; 292 /* llc event worker */ 293 wait_queue_head_t llc_flow_waiter; 294 /* w4 next llc event */ 295 wait_queue_head_t llc_msg_waiter; 296 /* w4 next llc msg */ 297 struct smc_llc_flow llc_flow_lcl; 298 /* llc local control field */ 299 struct smc_llc_flow llc_flow_rmt; 300 /* llc remote control field */ 301 struct smc_llc_qentry *delayed_event; 302 /* arrived when flow active */ 303 spinlock_t llc_flow_lock; 304 /* protects llc flow */ 305 int llc_testlink_time; 306 /* link keep alive time */ 307 u32 llc_termination_rsn; 308 /* rsn code for termination */ 309 u8 nexthop_mac[ETH_ALEN]; 310 u8 uses_gateway; 311 __be32 saddr; 312 /* net namespace */ 313 struct net *net; 314 }; 315 struct { /* SMC-D */ 316 u64 peer_gid; 317 /* Peer GID (remote) */ 318 struct smcd_dev *smcd; 319 /* ISM device for VLAN reg. */ 320 u8 peer_shutdown : 1; 321 /* peer triggered shutdownn */ 322 }; 323 }; 324}; 325 326struct smc_clc_msg_local; 327 328#define GID_LIST_SIZE 2 329 330struct smc_gidlist { 331 u8 len; 332 u8 list[GID_LIST_SIZE][SMC_GID_SIZE]; 333}; 334 335struct smc_init_info_smcrv2 { 336 /* Input fields */ 337 __be32 saddr; 338 struct sock *clc_sk; 339 __be32 daddr; 340 341 /* Output fields when saddr is set */ 342 struct smc_ib_device *ib_dev_v2; 343 u8 ib_port_v2; 344 u8 ib_gid_v2[SMC_GID_SIZE]; 345 346 /* Additional output fields when clc_sk and daddr is set as well */ 347 u8 uses_gateway; 348 u8 nexthop_mac[ETH_ALEN]; 349 350 struct smc_gidlist gidlist; 351}; 352 353struct smc_init_info { 354 u8 is_smcd; 355 u8 smc_type_v1; 356 u8 smc_type_v2; 357 u8 first_contact_peer; 358 u8 first_contact_local; 359 unsigned short vlan_id; 360 u32 rc; 361 u8 negotiated_eid[SMC_MAX_EID_LEN]; 362 /* SMC-R */ 363 u8 smcr_version; 364 u8 check_smcrv2; 365 u8 peer_gid[SMC_GID_SIZE]; 366 u8 peer_mac[ETH_ALEN]; 367 u8 peer_systemid[SMC_SYSTEMID_LEN]; 368 struct smc_ib_device *ib_dev; 369 u8 ib_gid[SMC_GID_SIZE]; 370 u8 ib_port; 371 u32 ib_clcqpn; 372 struct smc_init_info_smcrv2 smcrv2; 373 /* SMC-D */ 374 u64 ism_peer_gid[SMC_MAX_ISM_DEVS + 1]; 375 struct smcd_dev *ism_dev[SMC_MAX_ISM_DEVS + 1]; 376 u16 ism_chid[SMC_MAX_ISM_DEVS + 1]; 377 u8 ism_offered_cnt; /* # of ISM devices offered */ 378 u8 ism_selected; /* index of selected ISM dev*/ 379 u8 smcd_version; 380}; 381 382/* Find the connection associated with the given alert token in the link group. 383 * To use rbtrees we have to implement our own search core. 384 * Requires @conns_lock 385 * @token alert token to search for 386 * @lgr link group to search in 387 * Returns connection associated with token if found, NULL otherwise. 388 */ 389static inline struct smc_connection *smc_lgr_find_conn( 390 u32 token, struct smc_link_group *lgr) 391{ 392 struct smc_connection *res = NULL; 393 struct rb_node *node; 394 395 node = lgr->conns_all.rb_node; 396 while (node) { 397 struct smc_connection *cur = rb_entry(node, 398 struct smc_connection, alert_node); 399 400 if (cur->alert_token_local > token) { 401 node = node->rb_left; 402 } else { 403 if (cur->alert_token_local < token) { 404 node = node->rb_right; 405 } else { 406 res = cur; 407 break; 408 } 409 } 410 } 411 412 return res; 413} 414 415static inline bool smc_conn_lgr_valid(struct smc_connection *conn) 416{ 417 return conn->lgr && conn->alert_token_local; 418} 419 420/* 421 * Returns true if the specified link is usable. 422 * 423 * usable means the link is ready to receive RDMA messages, map memory 424 * on the link, etc. This doesn't ensure we are able to send RDMA messages 425 * on this link, if sending RDMA messages is needed, use smc_link_sendable() 426 */ 427static inline bool smc_link_usable(struct smc_link *lnk) 428{ 429 if (lnk->state == SMC_LNK_UNUSED || lnk->state == SMC_LNK_INACTIVE) 430 return false; 431 return true; 432} 433 434/* 435 * Returns true if the specified link is ready to receive AND send RDMA 436 * messages. 437 * 438 * For the client side in first contact, the underlying QP may still in 439 * RESET or RTR when the link state is ACTIVATING, checks in smc_link_usable() 440 * is not strong enough. For those places that need to send any CDC or LLC 441 * messages, use smc_link_sendable(), otherwise, use smc_link_usable() instead 442 */ 443static inline bool smc_link_sendable(struct smc_link *lnk) 444{ 445 return smc_link_usable(lnk) && 446 lnk->qp_attr.cur_qp_state == IB_QPS_RTS; 447} 448 449static inline bool smc_link_active(struct smc_link *lnk) 450{ 451 return lnk->state == SMC_LNK_ACTIVE; 452} 453 454static inline void smc_gid_be16_convert(__u8 *buf, u8 *gid_raw) 455{ 456 sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x", 457 be16_to_cpu(((__be16 *)gid_raw)[0]), 458 be16_to_cpu(((__be16 *)gid_raw)[1]), 459 be16_to_cpu(((__be16 *)gid_raw)[2]), 460 be16_to_cpu(((__be16 *)gid_raw)[3]), 461 be16_to_cpu(((__be16 *)gid_raw)[4]), 462 be16_to_cpu(((__be16 *)gid_raw)[5]), 463 be16_to_cpu(((__be16 *)gid_raw)[6]), 464 be16_to_cpu(((__be16 *)gid_raw)[7])); 465} 466 467struct smc_pci_dev { 468 __u32 pci_fid; 469 __u16 pci_pchid; 470 __u16 pci_vendor; 471 __u16 pci_device; 472 __u8 pci_id[SMC_PCI_ID_STR_LEN]; 473}; 474 475static inline void smc_set_pci_values(struct pci_dev *pci_dev, 476 struct smc_pci_dev *smc_dev) 477{ 478 smc_dev->pci_vendor = pci_dev->vendor; 479 smc_dev->pci_device = pci_dev->device; 480 snprintf(smc_dev->pci_id, sizeof(smc_dev->pci_id), "%s", 481 pci_name(pci_dev)); 482#if IS_ENABLED(CONFIG_S390) 483 { /* Set s390 specific PCI information */ 484 struct zpci_dev *zdev; 485 486 zdev = to_zpci(pci_dev); 487 smc_dev->pci_fid = zdev->fid; 488 smc_dev->pci_pchid = zdev->pchid; 489 } 490#endif 491} 492 493struct smc_sock; 494struct smc_clc_msg_accept_confirm; 495 496void smc_lgr_cleanup_early(struct smc_link_group *lgr); 497void smc_lgr_terminate_sched(struct smc_link_group *lgr); 498void smc_lgr_hold(struct smc_link_group *lgr); 499void smc_lgr_put(struct smc_link_group *lgr); 500void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport); 501void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport); 502void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, 503 unsigned short vlan); 504void smc_smcd_terminate_all(struct smcd_dev *dev); 505void smc_smcr_terminate_all(struct smc_ib_device *smcibdev); 506int smc_buf_create(struct smc_sock *smc, bool is_smcd); 507int smc_uncompress_bufsize(u8 compressed); 508int smc_rmb_rtoken_handling(struct smc_connection *conn, struct smc_link *link, 509 struct smc_clc_msg_accept_confirm *clc); 510int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey); 511int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey); 512void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new, 513 __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey); 514void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id, 515 __be64 nw_vaddr, __be32 nw_rkey); 516void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn); 517void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn); 518void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn); 519void smc_rmb_sync_sg_for_device(struct smc_connection *conn); 520int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini); 521 522void smc_conn_free(struct smc_connection *conn); 523int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini); 524void smc_lgr_schedule_free_work_fast(struct smc_link_group *lgr); 525int smc_core_init(void); 526void smc_core_exit(void); 527 528int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk, 529 u8 link_idx, struct smc_init_info *ini); 530void smcr_link_clear(struct smc_link *lnk, bool log); 531void smcr_link_hold(struct smc_link *lnk); 532void smcr_link_put(struct smc_link *lnk); 533void smc_switch_link_and_count(struct smc_connection *conn, 534 struct smc_link *to_lnk); 535int smcr_buf_map_lgr(struct smc_link *lnk); 536int smcr_buf_reg_lgr(struct smc_link *lnk); 537void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type); 538void smcr_lgr_set_type_asym(struct smc_link_group *lgr, 539 enum smc_lgr_type new_type, int asym_lnk_idx); 540int smcr_link_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc); 541struct smc_link *smc_switch_conns(struct smc_link_group *lgr, 542 struct smc_link *from_lnk, bool is_dev_err); 543void smcr_link_down_cond(struct smc_link *lnk); 544void smcr_link_down_cond_sched(struct smc_link *lnk); 545int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb); 546int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb); 547int smcr_nl_get_link(struct sk_buff *skb, struct netlink_callback *cb); 548int smcd_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb); 549 550static inline struct smc_link_group *smc_get_lgr(struct smc_link *link) 551{ 552 return link->lgr; 553} 554#endif