net/smc/smc_core.h

   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
  26 struct 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
  32 enum smc_lgr_role {             /* possible roles of a link group */
  33         SMC_CLNT,       /* client */
  34         SMC_SERV        /* server */
  35 };
  36
  37 enum 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
  47 struct smc_wr_buf {
  48         u8      raw[SMC_WR_BUF_SIZE];
  49 };
  50
  51 struct 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
  57 enum 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
  63 struct 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
  71 struct smc_rdma_sges {                          /* sges per message send */
  72         struct smc_rdma_sge     tx_rdma_sge[SMC_MAX_RDMA_WRITES];
  73 };
  74
  75 struct 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
  83 struct 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         u64                     wr_rx_id_compl; /* seq # of last completed WR */
 119         u32                     wr_rx_cnt;      /* number of WR recv buffers */
 120         unsigned long           wr_rx_tstamp;   /* jiffies when last buf rx */
 121         wait_queue_head_t       wr_rx_empty_wait; /* wait for RQ empty */
 122
 123         struct ib_reg_wr        wr_reg;         /* WR register memory region */
 124         wait_queue_head_t       wr_reg_wait;    /* wait for wr_reg result */
 125         atomic_t                wr_reg_refcnt;  /* reg refs to link */
 126         enum smc_wr_reg_state   wr_reg_state;   /* state of wr_reg request */
 127
 128         u8                      gid[SMC_GID_SIZE];/* gid matching used vlan id*/
 129         u8                      sgid_index;     /* gid index for vlan id      */
 130         u32                     peer_qpn;       /* QP number of peer */
 131         enum ib_mtu             path_mtu;       /* used mtu */
 132         enum ib_mtu             peer_mtu;       /* mtu size of peer */
 133         u32                     psn_initial;    /* QP tx initial packet seqno */
 134         u32                     peer_psn;       /* QP rx initial packet seqno */
 135         u8                      peer_mac[ETH_ALEN];     /* = gid[8:10||13:15] */
 136         u8                      peer_gid[SMC_GID_SIZE]; /* gid of peer*/
 137         u8                      link_id;        /* unique # within link group */
 138         u8                      link_uid[SMC_LGR_ID_SIZE]; /* unique lnk id */
 139         u8                      peer_link_uid[SMC_LGR_ID_SIZE]; /* peer uid */
 140         u8                      link_idx;       /* index in lgr link array */
 141         u8                      link_is_asym;   /* is link asymmetric? */
 142         u8                      clearing : 1;   /* link is being cleared */
 143         refcount_t              refcnt;         /* link reference count */
 144         struct smc_link_group   *lgr;           /* parent link group */
 145         struct work_struct      link_down_wrk;  /* wrk to bring link down */
 146         char                    ibname[IB_DEVICE_NAME_MAX]; /* ib device name */
 147         int                     ndev_ifidx; /* network device ifindex */
 148
 149         enum smc_link_state     state;          /* state of link */
 150         struct delayed_work     llc_testlink_wrk; /* testlink worker */
 151         struct completion       llc_testlink_resp; /* wait for rx of testlink */
 152         int                     llc_testlink_time; /* testlink interval */
 153         atomic_t                conn_cnt; /* connections on this link */
 154 };
 155
 156 /* For now we just allow one parallel link per link group. The SMC protocol
 157  * allows more (up to 8).
 158  */
 159 #define SMC_LINKS_PER_LGR_MAX   3
 160 #define SMC_SINGLE_LINK         0
 161
 162 /* tx/rx buffer list element for sndbufs list and rmbs list of a lgr */
 163 struct smc_buf_desc {
 164         struct list_head        list;
 165         void                    *cpu_addr;      /* virtual address of buffer */
 166         struct page             *pages;
 167         int                     len;            /* length of buffer */
 168         u32                     used;           /* currently used / unused */
 169         union {
 170                 struct { /* SMC-R */
 171                         struct sg_table sgt[SMC_LINKS_PER_LGR_MAX];
 172                                         /* virtual buffer */
 173                         struct ib_mr    *mr[SMC_LINKS_PER_LGR_MAX];
 174                                         /* memory region: for rmb and
 175                                          * vzalloced sndbuf
 176                                          * incl. rkey provided to peer
 177                                          * and lkey provided to local
 178                                          */
 179                         u32             order;  /* allocation order */
 180
 181                         u8              is_conf_rkey;
 182                                         /* confirm_rkey done */
 183                         u8              is_reg_mr[SMC_LINKS_PER_LGR_MAX];
 184                                         /* mem region registered */
 185                         u8              is_map_ib[SMC_LINKS_PER_LGR_MAX];
 186                                         /* mem region mapped to lnk */
 187                         u8              is_dma_need_sync;
 188                         u8              is_reg_err;
 189                                         /* buffer registration err */
 190                         u8              is_vm;
 191                                         /* virtually contiguous */
 192                 };
 193                 struct { /* SMC-D */
 194                         unsigned short  sba_idx;
 195                                         /* SBA index number */
 196                         u64             token;
 197                                         /* DMB token number */
 198                         dma_addr_t      dma_addr;
 199                                         /* DMA address */
 200                 };
 201         };
 202 };
 203
 204 struct smc_rtoken {                             /* address/key of remote RMB */
 205         u64                     dma_addr;
 206         u32                     rkey;
 207 };
 208
 209 #define SMC_BUF_MIN_SIZE        16384   /* minimum size of an RMB */
 210 #define SMC_RMBE_SIZES          16      /* number of distinct RMBE sizes */
 211 /* theoretically, the RFC states that largest size would be 512K,
 212  * i.e. compressed 5 and thus 6 sizes (0..5), despite
 213  * struct smc_clc_msg_accept_confirm.rmbe_size being a 4 bit value (0..15)
 214  */
 215
 216 struct smcd_dev;
 217
 218 enum smc_lgr_type {                             /* redundancy state of lgr */
 219         SMC_LGR_NONE,                   /* no active links, lgr to be deleted */
 220         SMC_LGR_SINGLE,                 /* 1 active RNIC on each peer */
 221         SMC_LGR_SYMMETRIC,              /* 2 active RNICs on each peer */
 222         SMC_LGR_ASYMMETRIC_PEER,        /* local has 2, peer 1 active RNICs */
 223         SMC_LGR_ASYMMETRIC_LOCAL,       /* local has 1, peer 2 active RNICs */
 224 };
 225
 226 enum smcr_buf_type {            /* types of SMC-R sndbufs and RMBs */
 227         SMCR_PHYS_CONT_BUFS     = 0,
 228         SMCR_VIRT_CONT_BUFS     = 1,
 229         SMCR_MIXED_BUFS         = 2,
 230 };
 231
 232 enum smc_llc_flowtype {
 233         SMC_LLC_FLOW_NONE       = 0,
 234         SMC_LLC_FLOW_ADD_LINK   = 2,
 235         SMC_LLC_FLOW_DEL_LINK   = 4,
 236         SMC_LLC_FLOW_REQ_ADD_LINK = 5,
 237         SMC_LLC_FLOW_RKEY       = 6,
 238 };
 239
 240 struct smc_llc_qentry;
 241
 242 struct smc_llc_flow {
 243         enum smc_llc_flowtype type;
 244         struct smc_llc_qentry *qentry;
 245 };
 246
 247 struct smc_link_group {
 248         struct list_head        list;
 249         struct rb_root          conns_all;      /* connection tree */
 250         rwlock_t                conns_lock;     /* protects conns_all */
 251         unsigned int            conns_num;      /* current # of connections */
 252         unsigned short          vlan_id;        /* vlan id of link group */
 253
 254         struct list_head        sndbufs[SMC_RMBE_SIZES];/* tx buffers */
 255         struct rw_semaphore     sndbufs_lock;   /* protects tx buffers */
 256         struct list_head        rmbs[SMC_RMBE_SIZES];   /* rx buffers */
 257         struct rw_semaphore     rmbs_lock;      /* protects rx buffers */
 258
 259         u8                      id[SMC_LGR_ID_SIZE];    /* unique lgr id */
 260         struct delayed_work     free_work;      /* delayed freeing of an lgr */
 261         struct work_struct      terminate_work; /* abnormal lgr termination */
 262         struct workqueue_struct *tx_wq;         /* wq for conn. tx workers */
 263         u8                      sync_err : 1;   /* lgr no longer fits to peer */
 264         u8                      terminating : 1;/* lgr is terminating */
 265         u8                      freeing : 1;    /* lgr is being freed */
 266
 267         refcount_t              refcnt;         /* lgr reference count */
 268         bool                    is_smcd;        /* SMC-R or SMC-D */
 269         u8                      smc_version;
 270         u8                      negotiated_eid[SMC_MAX_EID_LEN];
 271         u8                      peer_os;        /* peer operating system */
 272         u8                      peer_smc_release;
 273         u8                      peer_hostname[SMC_MAX_HOSTNAME_LEN];
 274         union {
 275                 struct { /* SMC-R */
 276                         enum smc_lgr_role       role;
 277                                                 /* client or server */
 278                         struct smc_link         lnk[SMC_LINKS_PER_LGR_MAX];
 279                                                 /* smc link */
 280                         struct smc_wr_v2_buf    *wr_rx_buf_v2;
 281                                                 /* WR v2 recv payload buffer */
 282                         struct smc_wr_v2_buf    *wr_tx_buf_v2;
 283                                                 /* WR v2 send payload buffer */
 284                         char                    peer_systemid[SMC_SYSTEMID_LEN];
 285                                                 /* unique system_id of peer */
 286                         struct smc_rtoken       rtokens[SMC_RMBS_PER_LGR_MAX]
 287                                                 [SMC_LINKS_PER_LGR_MAX];
 288                                                 /* remote addr/key pairs */
 289                         DECLARE_BITMAP(rtokens_used_mask, SMC_RMBS_PER_LGR_MAX);
 290                                                 /* used rtoken elements */
 291                         u8                      next_link_id;
 292                         enum smc_lgr_type       type;
 293                         enum smcr_buf_type      buf_type;
 294                                                 /* redundancy state */
 295                         u8                      pnet_id[SMC_MAX_PNETID_LEN + 1];
 296                                                 /* pnet id of this lgr */
 297                         struct list_head        llc_event_q;
 298                                                 /* queue for llc events */
 299                         spinlock_t              llc_event_q_lock;
 300                                                 /* protects llc_event_q */
 301                         struct mutex            llc_conf_mutex;
 302                                                 /* protects lgr reconfig. */
 303                         struct work_struct      llc_add_link_work;
 304                         struct work_struct      llc_del_link_work;
 305                         struct work_struct      llc_event_work;
 306                                                 /* llc event worker */
 307                         wait_queue_head_t       llc_flow_waiter;
 308                                                 /* w4 next llc event */
 309                         wait_queue_head_t       llc_msg_waiter;
 310                                                 /* w4 next llc msg */
 311                         struct smc_llc_flow     llc_flow_lcl;
 312                                                 /* llc local control field */
 313                         struct smc_llc_flow     llc_flow_rmt;
 314                                                 /* llc remote control field */
 315                         struct smc_llc_qentry   *delayed_event;
 316                                                 /* arrived when flow active */
 317                         spinlock_t              llc_flow_lock;
 318                                                 /* protects llc flow */
 319                         int                     llc_testlink_time;
 320                                                 /* link keep alive time */
 321                         u32                     llc_termination_rsn;
 322                                                 /* rsn code for termination */
 323                         u8                      nexthop_mac[ETH_ALEN];
 324                         u8                      uses_gateway;
 325                         __be32                  saddr;
 326                                                 /* net namespace */
 327                         struct net              *net;
 328                 };
 329                 struct { /* SMC-D */
 330                         u64                     peer_gid;
 331                                                 /* Peer GID (remote) */
 332                         struct smcd_dev         *smcd;
 333                                                 /* ISM device for VLAN reg. */
 334                         u8                      peer_shutdown : 1;
 335                                                 /* peer triggered shutdownn */
 336                 };
 337         };
 338 };
 339
 340 struct smc_clc_msg_local;
 341
 342 #define GID_LIST_SIZE   2
 343
 344 struct smc_gidlist {
 345         u8                      len;
 346         u8                      list[GID_LIST_SIZE][SMC_GID_SIZE];
 347 };
 348
 349 struct smc_init_info_smcrv2 {
 350         /* Input fields */
 351         __be32                  saddr;
 352         struct sock             *clc_sk;
 353         __be32                  daddr;
 354
 355         /* Output fields when saddr is set */
 356         struct smc_ib_device    *ib_dev_v2;
 357         u8                      ib_port_v2;
 358         u8                      ib_gid_v2[SMC_GID_SIZE];
 359
 360         /* Additional output fields when clc_sk and daddr is set as well */
 361         u8                      uses_gateway;
 362         u8                      nexthop_mac[ETH_ALEN];
 363
 364         struct smc_gidlist      gidlist;
 365 };
 366
 367 struct smc_init_info {
 368         u8                      is_smcd;
 369         u8                      smc_type_v1;
 370         u8                      smc_type_v2;
 371         u8                      first_contact_peer;
 372         u8                      first_contact_local;
 373         unsigned short          vlan_id;
 374         u32                     rc;
 375         u8                      negotiated_eid[SMC_MAX_EID_LEN];
 376         /* SMC-R */
 377         u8                      smcr_version;
 378         u8                      check_smcrv2;
 379         u8                      peer_gid[SMC_GID_SIZE];
 380         u8                      peer_mac[ETH_ALEN];
 381         u8                      peer_systemid[SMC_SYSTEMID_LEN];
 382         struct smc_ib_device    *ib_dev;
 383         u8                      ib_gid[SMC_GID_SIZE];
 384         u8                      ib_port;
 385         u32                     ib_clcqpn;
 386         struct smc_init_info_smcrv2 smcrv2;
 387         /* SMC-D */
 388         u64                     ism_peer_gid[SMC_MAX_ISM_DEVS + 1];
 389         struct smcd_dev         *ism_dev[SMC_MAX_ISM_DEVS + 1];
 390         u16                     ism_chid[SMC_MAX_ISM_DEVS + 1];
 391         u8                      ism_offered_cnt; /* # of ISM devices offered */
 392         u8                      ism_selected;    /* index of selected ISM dev*/
 393         u8                      smcd_version;
 394 };
 395
 396 /* Find the connection associated with the given alert token in the link group.
 397  * To use rbtrees we have to implement our own search core.
 398  * Requires @conns_lock
 399  * @token       alert token to search for
 400  * @lgr          link group to search in
 401  * Returns connection associated with token if found, NULL otherwise.
 402  */
 403 static inline struct smc_connection *smc_lgr_find_conn(
 404         u32 token, struct smc_link_group *lgr)
 405 {
 406         struct smc_connection *res = NULL;
 407         struct rb_node *node;
 408
 409         node = lgr->conns_all.rb_node;
 410         while (node) {
 411                 struct smc_connection *cur = rb_entry(node,
 412                                         struct smc_connection, alert_node);
 413
 414                 if (cur->alert_token_local > token) {
 415                         node = node->rb_left;
 416                 } else {
 417                         if (cur->alert_token_local < token) {
 418                                 node = node->rb_right;
 419                         } else {
 420                                 res = cur;
 421                                 break;
 422                         }
 423                 }
 424         }
 425
 426         return res;
 427 }
 428
 429 static inline bool smc_conn_lgr_valid(struct smc_connection *conn)
 430 {
 431         return conn->lgr && conn->alert_token_local;
 432 }
 433
 434 /*
 435  * Returns true if the specified link is usable.
 436  *
 437  * usable means the link is ready to receive RDMA messages, map memory
 438  * on the link, etc. This doesn't ensure we are able to send RDMA messages
 439  * on this link, if sending RDMA messages is needed, use smc_link_sendable()
 440  */
 441 static inline bool smc_link_usable(struct smc_link *lnk)
 442 {
 443         if (lnk->state == SMC_LNK_UNUSED || lnk->state == SMC_LNK_INACTIVE)
 444                 return false;
 445         return true;
 446 }
 447
 448 /*
 449  * Returns true if the specified link is ready to receive AND send RDMA
 450  * messages.
 451  *
 452  * For the client side in first contact, the underlying QP may still in
 453  * RESET or RTR when the link state is ACTIVATING, checks in smc_link_usable()
 454  * is not strong enough. For those places that need to send any CDC or LLC
 455  * messages, use smc_link_sendable(), otherwise, use smc_link_usable() instead
 456  */
 457 static inline bool smc_link_sendable(struct smc_link *lnk)
 458 {
 459         return smc_link_usable(lnk) &&
 460                 lnk->qp_attr.cur_qp_state == IB_QPS_RTS;
 461 }
 462
 463 static inline bool smc_link_active(struct smc_link *lnk)
 464 {
 465         return lnk->state == SMC_LNK_ACTIVE;
 466 }
 467
 468 static inline void smc_gid_be16_convert(__u8 *buf, u8 *gid_raw)
 469 {
 470         sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x",
 471                 be16_to_cpu(((__be16 *)gid_raw)[0]),
 472                 be16_to_cpu(((__be16 *)gid_raw)[1]),
 473                 be16_to_cpu(((__be16 *)gid_raw)[2]),
 474                 be16_to_cpu(((__be16 *)gid_raw)[3]),
 475                 be16_to_cpu(((__be16 *)gid_raw)[4]),
 476                 be16_to_cpu(((__be16 *)gid_raw)[5]),
 477                 be16_to_cpu(((__be16 *)gid_raw)[6]),
 478                 be16_to_cpu(((__be16 *)gid_raw)[7]));
 479 }
 480
 481 struct smc_pci_dev {
 482         __u32           pci_fid;
 483         __u16           pci_pchid;
 484         __u16           pci_vendor;
 485         __u16           pci_device;
 486         __u8            pci_id[SMC_PCI_ID_STR_LEN];
 487 };
 488
 489 static inline void smc_set_pci_values(struct pci_dev *pci_dev,
 490                                       struct smc_pci_dev *smc_dev)
 491 {
 492         smc_dev->pci_vendor = pci_dev->vendor;
 493         smc_dev->pci_device = pci_dev->device;
 494         snprintf(smc_dev->pci_id, sizeof(smc_dev->pci_id), "%s",
 495                  pci_name(pci_dev));
 496 #if IS_ENABLED(CONFIG_S390)
 497         { /* Set s390 specific PCI information */
 498         struct zpci_dev *zdev;
 499
 500         zdev = to_zpci(pci_dev);
 501         smc_dev->pci_fid = zdev->fid;
 502         smc_dev->pci_pchid = zdev->pchid;
 503         }
 504 #endif
 505 }
 506
 507 struct smc_sock;
 508 struct smc_clc_msg_accept_confirm;
 509
 510 void smc_lgr_cleanup_early(struct smc_link_group *lgr);
 511 void smc_lgr_terminate_sched(struct smc_link_group *lgr);
 512 void smc_lgr_hold(struct smc_link_group *lgr);
 513 void smc_lgr_put(struct smc_link_group *lgr);
 514 void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport);
 515 void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport);
 516 void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid,
 517                         unsigned short vlan);
 518 void smc_smcd_terminate_all(struct smcd_dev *dev);
 519 void smc_smcr_terminate_all(struct smc_ib_device *smcibdev);
 520 int smc_buf_create(struct smc_sock *smc, bool is_smcd);
 521 int smc_uncompress_bufsize(u8 compressed);
 522 int smc_rmb_rtoken_handling(struct smc_connection *conn, struct smc_link *link,
 523                             struct smc_clc_msg_accept_confirm *clc);
 524 int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey);
 525 int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey);
 526 void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new,
 527                     __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey);
 528 void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id,
 529                      __be64 nw_vaddr, __be32 nw_rkey);
 530 void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn);
 531 void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn);
 532 int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini);
 533
 534 void smc_conn_free(struct smc_connection *conn);
 535 int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini);
 536 void smc_lgr_schedule_free_work_fast(struct smc_link_group *lgr);
 537 int smc_core_init(void);
 538 void smc_core_exit(void);
 539
 540 int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk,
 541                    u8 link_idx, struct smc_init_info *ini);
 542 void smcr_link_clear(struct smc_link *lnk, bool log);
 543 void smcr_link_hold(struct smc_link *lnk);
 544 void smcr_link_put(struct smc_link *lnk);
 545 void smc_switch_link_and_count(struct smc_connection *conn,
 546                                struct smc_link *to_lnk);
 547 int smcr_buf_map_lgr(struct smc_link *lnk);
 548 int smcr_buf_reg_lgr(struct smc_link *lnk);
 549 void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type);
 550 void smcr_lgr_set_type_asym(struct smc_link_group *lgr,
 551                             enum smc_lgr_type new_type, int asym_lnk_idx);
 552 int smcr_link_reg_buf(struct smc_link *link, struct smc_buf_desc *rmb_desc);
 553 struct smc_link *smc_switch_conns(struct smc_link_group *lgr,
 554                                   struct smc_link *from_lnk, bool is_dev_err);
 555 void smcr_link_down_cond(struct smc_link *lnk);
 556 void smcr_link_down_cond_sched(struct smc_link *lnk);
 557 int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb);
 558 int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb);
 559 int smcr_nl_get_link(struct sk_buff *skb, struct netlink_callback *cb);
 560 int smcd_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb);
 561
 562 static inline struct smc_link_group *smc_get_lgr(struct smc_link *link)
 563 {
 564         return link->lgr;
 565 }
 566 #endif