net/rds/ib.h

   1 #ifndef _RDS_IB_H
   2 #define _RDS_IB_H
   3
   4 #include <rdma/ib_verbs.h>
   5 #include <rdma/rdma_cm.h>
   6 #include <linux/interrupt.h>
   7 #include <linux/pci.h>
   8 #include <linux/slab.h>
   9 #include "rds.h"
  10 #include "rdma_transport.h"
  11
  12 #define RDS_FMR_1M_POOL_SIZE            (8192 / 2)
  13 #define RDS_FMR_1M_MSG_SIZE             256
  14 #define RDS_FMR_8K_MSG_SIZE             2
  15 #define RDS_MR_8K_SCALE                 (256 / (RDS_FMR_8K_MSG_SIZE + 1))
  16 #define RDS_FMR_8K_POOL_SIZE            (RDS_MR_8K_SCALE * (8192 / 2))
  17
  18 #define RDS_IB_MAX_SGE                  8
  19 #define RDS_IB_RECV_SGE                 2
  20
  21 #define RDS_IB_DEFAULT_RECV_WR          1024
  22 #define RDS_IB_DEFAULT_SEND_WR          256
  23
  24 #define RDS_IB_DEFAULT_RETRY_COUNT      2
  25
  26 #define RDS_IB_SUPPORTED_PROTOCOLS      0x00000003      /* minor versions supported */
  27
  28 #define RDS_IB_RECYCLE_BATCH_COUNT      32
  29
  30 #define RDS_IB_WC_MAX                   32
  31 #define RDS_IB_SEND_OP                  BIT_ULL(63)
  32
  33 extern struct rw_semaphore rds_ib_devices_lock;
  34 extern struct list_head rds_ib_devices;
  35
  36 /*
  37  * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
  38  * try and minimize the amount of memory tied up both the device and
  39  * socket receive queues.
  40  */
  41 struct rds_page_frag {
  42         struct list_head        f_item;
  43         struct list_head        f_cache_entry;
  44         struct scatterlist      f_sg;
  45 };
  46
  47 struct rds_ib_incoming {
  48         struct list_head        ii_frags;
  49         struct list_head        ii_cache_entry;
  50         struct rds_incoming     ii_inc;
  51 };
  52
  53 struct rds_ib_cache_head {
  54         struct list_head *first;
  55         unsigned long count;
  56 };
  57
  58 struct rds_ib_refill_cache {
  59         struct rds_ib_cache_head __percpu *percpu;
  60         struct list_head         *xfer;
  61         struct list_head         *ready;
  62 };
  63
  64 struct rds_ib_connect_private {
  65         /* Add new fields at the end, and don't permute existing fields. */
  66         __be32                  dp_saddr;
  67         __be32                  dp_daddr;
  68         u8                      dp_protocol_major;
  69         u8                      dp_protocol_minor;
  70         __be16                  dp_protocol_minor_mask; /* bitmask */
  71         __be32                  dp_reserved1;
  72         __be64                  dp_ack_seq;
  73         __be32                  dp_credit;              /* non-zero enables flow ctl */
  74 };
  75
  76 struct rds_ib_send_work {
  77         void                    *s_op;
  78         union {
  79                 struct ib_send_wr       s_wr;
  80                 struct ib_rdma_wr       s_rdma_wr;
  81                 struct ib_atomic_wr     s_atomic_wr;
  82         };
  83         struct ib_sge           s_sge[RDS_IB_MAX_SGE];
  84         unsigned long           s_queued;
  85 };
  86
  87 struct rds_ib_recv_work {
  88         struct rds_ib_incoming  *r_ibinc;
  89         struct rds_page_frag    *r_frag;
  90         struct ib_recv_wr       r_wr;
  91         struct ib_sge           r_sge[2];
  92 };
  93
  94 struct rds_ib_work_ring {
  95         u32             w_nr;
  96         u32             w_alloc_ptr;
  97         u32             w_alloc_ctr;
  98         u32             w_free_ptr;
  99         atomic_t        w_free_ctr;
 100 };
 101
 102 /* Rings are posted with all the allocations they'll need to queue the
 103  * incoming message to the receiving socket so this can't fail.
 104  * All fragments start with a header, so we can make sure we're not receiving
 105  * garbage, and we can tell a small 8 byte fragment from an ACK frame.
 106  */
 107 struct rds_ib_ack_state {
 108         u64             ack_next;
 109         u64             ack_recv;
 110         unsigned int    ack_required:1;
 111         unsigned int    ack_next_valid:1;
 112         unsigned int    ack_recv_valid:1;
 113 };
 114
 115
 116 struct rds_ib_device;
 117
 118 struct rds_ib_connection {
 119
 120         struct list_head        ib_node;
 121         struct rds_ib_device    *rds_ibdev;
 122         struct rds_connection   *conn;
 123
 124         /* alphabet soup, IBTA style */
 125         struct rdma_cm_id       *i_cm_id;
 126         struct ib_pd            *i_pd;
 127         struct ib_cq            *i_send_cq;
 128         struct ib_cq            *i_recv_cq;
 129         struct ib_wc            i_send_wc[RDS_IB_WC_MAX];
 130         struct ib_wc            i_recv_wc[RDS_IB_WC_MAX];
 131
 132         /* interrupt handling */
 133         struct tasklet_struct   i_send_tasklet;
 134         struct tasklet_struct   i_recv_tasklet;
 135
 136         /* tx */
 137         struct rds_ib_work_ring i_send_ring;
 138         struct rm_data_op       *i_data_op;
 139         struct rds_header       *i_send_hdrs;
 140         u64                     i_send_hdrs_dma;
 141         struct rds_ib_send_work *i_sends;
 142         atomic_t                i_signaled_sends;
 143
 144         /* rx */
 145         struct mutex            i_recv_mutex;
 146         struct rds_ib_work_ring i_recv_ring;
 147         struct rds_ib_incoming  *i_ibinc;
 148         u32                     i_recv_data_rem;
 149         struct rds_header       *i_recv_hdrs;
 150         u64                     i_recv_hdrs_dma;
 151         struct rds_ib_recv_work *i_recvs;
 152         u64                     i_ack_recv;     /* last ACK received */
 153         struct rds_ib_refill_cache i_cache_incs;
 154         struct rds_ib_refill_cache i_cache_frags;
 155
 156         /* sending acks */
 157         unsigned long           i_ack_flags;
 158 #ifdef KERNEL_HAS_ATOMIC64
 159         atomic64_t              i_ack_next;     /* next ACK to send */
 160 #else
 161         spinlock_t              i_ack_lock;     /* protect i_ack_next */
 162         u64                     i_ack_next;     /* next ACK to send */
 163 #endif
 164         struct rds_header       *i_ack;
 165         struct ib_send_wr       i_ack_wr;
 166         struct ib_sge           i_ack_sge;
 167         u64                     i_ack_dma;
 168         unsigned long           i_ack_queued;
 169
 170         /* Flow control related information
 171          *
 172          * Our algorithm uses a pair variables that we need to access
 173          * atomically - one for the send credits, and one posted
 174          * recv credits we need to transfer to remote.
 175          * Rather than protect them using a slow spinlock, we put both into
 176          * a single atomic_t and update it using cmpxchg
 177          */
 178         atomic_t                i_credits;
 179
 180         /* Protocol version specific information */
 181         unsigned int            i_flowctl:1;    /* enable/disable flow ctl */
 182
 183         /* Batched completions */
 184         unsigned int            i_unsignaled_wrs;
 185 };
 186
 187 /* This assumes that atomic_t is at least 32 bits */
 188 #define IB_GET_SEND_CREDITS(v)  ((v) & 0xffff)
 189 #define IB_GET_POST_CREDITS(v)  ((v) >> 16)
 190 #define IB_SET_SEND_CREDITS(v)  ((v) & 0xffff)
 191 #define IB_SET_POST_CREDITS(v)  ((v) << 16)
 192
 193 struct rds_ib_ipaddr {
 194         struct list_head        list;
 195         __be32                  ipaddr;
 196         struct rcu_head         rcu;
 197 };
 198
 199 enum {
 200         RDS_IB_MR_8K_POOL,
 201         RDS_IB_MR_1M_POOL,
 202 };
 203
 204 struct rds_ib_device {
 205         struct list_head        list;
 206         struct list_head        ipaddr_list;
 207         struct list_head        conn_list;
 208         struct ib_device        *dev;
 209         struct ib_pd            *pd;
 210         unsigned int            max_fmrs;
 211         struct rds_ib_mr_pool   *mr_1m_pool;
 212         struct rds_ib_mr_pool   *mr_8k_pool;
 213         unsigned int            fmr_max_remaps;
 214         unsigned int            max_8k_fmrs;
 215         unsigned int            max_1m_fmrs;
 216         int                     max_sge;
 217         unsigned int            max_wrs;
 218         unsigned int            max_initiator_depth;
 219         unsigned int            max_responder_resources;
 220         spinlock_t              spinlock;       /* protect the above */
 221         atomic_t                refcount;
 222         struct work_struct      free_work;
 223 };
 224
 225 #define ibdev_to_node(ibdev) dev_to_node(ibdev->dma_device)
 226 #define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)
 227
 228 /* bits for i_ack_flags */
 229 #define IB_ACK_IN_FLIGHT        0
 230 #define IB_ACK_REQUESTED        1
 231
 232 /* Magic WR_ID for ACKs */
 233 #define RDS_IB_ACK_WR_ID        (~(u64) 0)
 234
 235 struct rds_ib_statistics {
 236         uint64_t        s_ib_connect_raced;
 237         uint64_t        s_ib_listen_closed_stale;
 238         uint64_t        s_ib_evt_handler_call;
 239         uint64_t        s_ib_tasklet_call;
 240         uint64_t        s_ib_tx_cq_event;
 241         uint64_t        s_ib_tx_ring_full;
 242         uint64_t        s_ib_tx_throttle;
 243         uint64_t        s_ib_tx_sg_mapping_failure;
 244         uint64_t        s_ib_tx_stalled;
 245         uint64_t        s_ib_tx_credit_updates;
 246         uint64_t        s_ib_rx_cq_event;
 247         uint64_t        s_ib_rx_ring_empty;
 248         uint64_t        s_ib_rx_refill_from_cq;
 249         uint64_t        s_ib_rx_refill_from_thread;
 250         uint64_t        s_ib_rx_alloc_limit;
 251         uint64_t        s_ib_rx_credit_updates;
 252         uint64_t        s_ib_ack_sent;
 253         uint64_t        s_ib_ack_send_failure;
 254         uint64_t        s_ib_ack_send_delayed;
 255         uint64_t        s_ib_ack_send_piggybacked;
 256         uint64_t        s_ib_ack_received;
 257         uint64_t        s_ib_rdma_mr_8k_alloc;
 258         uint64_t        s_ib_rdma_mr_8k_free;
 259         uint64_t        s_ib_rdma_mr_8k_used;
 260         uint64_t        s_ib_rdma_mr_8k_pool_flush;
 261         uint64_t        s_ib_rdma_mr_8k_pool_wait;
 262         uint64_t        s_ib_rdma_mr_8k_pool_depleted;
 263         uint64_t        s_ib_rdma_mr_1m_alloc;
 264         uint64_t        s_ib_rdma_mr_1m_free;
 265         uint64_t        s_ib_rdma_mr_1m_used;
 266         uint64_t        s_ib_rdma_mr_1m_pool_flush;
 267         uint64_t        s_ib_rdma_mr_1m_pool_wait;
 268         uint64_t        s_ib_rdma_mr_1m_pool_depleted;
 269         uint64_t        s_ib_atomic_cswp;
 270         uint64_t        s_ib_atomic_fadd;
 271 };
 272
 273 extern struct workqueue_struct *rds_ib_wq;
 274
 275 /*
 276  * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
 277  * doesn't define it.
 278  */
 279 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
 280                                               struct scatterlist *sglist,
 281                                               unsigned int sg_dma_len,
 282                                               int direction)
 283 {
 284         struct scatterlist *sg;
 285         unsigned int i;
 286
 287         for_each_sg(sglist, sg, sg_dma_len, i) {
 288                 ib_dma_sync_single_for_cpu(dev,
 289                                 ib_sg_dma_address(dev, sg),
 290                                 ib_sg_dma_len(dev, sg),
 291                                 direction);
 292         }
 293 }
 294 #define ib_dma_sync_sg_for_cpu  rds_ib_dma_sync_sg_for_cpu
 295
 296 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
 297                                                  struct scatterlist *sglist,
 298                                                  unsigned int sg_dma_len,
 299                                                  int direction)
 300 {
 301         struct scatterlist *sg;
 302         unsigned int i;
 303
 304         for_each_sg(sglist, sg, sg_dma_len, i) {
 305                 ib_dma_sync_single_for_device(dev,
 306                                 ib_sg_dma_address(dev, sg),
 307                                 ib_sg_dma_len(dev, sg),
 308                                 direction);
 309         }
 310 }
 311 #define ib_dma_sync_sg_for_device       rds_ib_dma_sync_sg_for_device
 312
 313
 314 /* ib.c */
 315 extern struct rds_transport rds_ib_transport;
 316 struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device);
 317 void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
 318 extern struct ib_client rds_ib_client;
 319
 320 extern unsigned int rds_ib_fmr_1m_pool_size;
 321 extern unsigned int rds_ib_fmr_8k_pool_size;
 322 extern unsigned int rds_ib_retry_count;
 323
 324 extern spinlock_t ib_nodev_conns_lock;
 325 extern struct list_head ib_nodev_conns;
 326
 327 /* ib_cm.c */
 328 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
 329 void rds_ib_conn_free(void *arg);
 330 int rds_ib_conn_connect(struct rds_connection *conn);
 331 void rds_ib_conn_shutdown(struct rds_connection *conn);
 332 void rds_ib_state_change(struct sock *sk);
 333 int rds_ib_listen_init(void);
 334 void rds_ib_listen_stop(void);
 335 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
 336 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
 337                              struct rdma_cm_event *event);
 338 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
 339 void rds_ib_cm_connect_complete(struct rds_connection *conn,
 340                                 struct rdma_cm_event *event);
 341
 342
 343 #define rds_ib_conn_error(conn, fmt...) \
 344         __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
 345
 346 /* ib_rdma.c */
 347 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
 348 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 349 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 350 void rds_ib_destroy_nodev_conns(void);
 351 struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *rds_dev,
 352                                              int npages);
 353 void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo);
 354 void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
 355 void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
 356                     struct rds_sock *rs, u32 *key_ret);
 357 void rds_ib_sync_mr(void *trans_private, int dir);
 358 void rds_ib_free_mr(void *trans_private, int invalidate);
 359 void rds_ib_flush_mrs(void);
 360 int rds_ib_fmr_init(void);
 361 void rds_ib_fmr_exit(void);
 362
 363 /* ib_recv.c */
 364 int rds_ib_recv_init(void);
 365 void rds_ib_recv_exit(void);
 366 int rds_ib_recv(struct rds_connection *conn);
 367 int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic);
 368 void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
 369 void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp);
 370 void rds_ib_inc_free(struct rds_incoming *inc);
 371 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
 372 void rds_ib_recv_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc,
 373                              struct rds_ib_ack_state *state);
 374 void rds_ib_recv_tasklet_fn(unsigned long data);
 375 void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
 376 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
 377 void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
 378 void rds_ib_attempt_ack(struct rds_ib_connection *ic);
 379 void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
 380 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
 381 void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required);
 382
 383 /* ib_ring.c */
 384 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
 385 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
 386 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
 387 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
 388 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
 389 int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
 390 int rds_ib_ring_low(struct rds_ib_work_ring *ring);
 391 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
 392 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
 393 extern wait_queue_head_t rds_ib_ring_empty_wait;
 394
 395 /* ib_send.c */
 396 void rds_ib_xmit_complete(struct rds_connection *conn);
 397 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
 398                 unsigned int hdr_off, unsigned int sg, unsigned int off);
 399 void rds_ib_send_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
 400 void rds_ib_send_init_ring(struct rds_ib_connection *ic);
 401 void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
 402 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
 403 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
 404 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
 405 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
 406                              u32 *adv_credits, int need_posted, int max_posted);
 407 int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
 408
 409 /* ib_stats.c */
 410 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
 411 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
 412 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
 413                                     unsigned int avail);
 414
 415 /* ib_sysctl.c */
 416 int rds_ib_sysctl_init(void);
 417 void rds_ib_sysctl_exit(void);
 418 extern unsigned long rds_ib_sysctl_max_send_wr;
 419 extern unsigned long rds_ib_sysctl_max_recv_wr;
 420 extern unsigned long rds_ib_sysctl_max_unsig_wrs;
 421 extern unsigned long rds_ib_sysctl_max_unsig_bytes;
 422 extern unsigned long rds_ib_sysctl_max_recv_allocation;
 423 extern unsigned int rds_ib_sysctl_flow_control;
 424
 425 #endif