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_IB_MAX_SGE                  8
  13 #define RDS_IB_RECV_SGE                 2
  14
  15 #define RDS_IB_DEFAULT_RECV_WR          1024
  16 #define RDS_IB_DEFAULT_SEND_WR          256
  17 #define RDS_IB_DEFAULT_FR_WR            256
  18 #define RDS_IB_DEFAULT_FR_INV_WR        256
  19
  20 #define RDS_IB_DEFAULT_RETRY_COUNT      1
  21
  22 #define RDS_IB_SUPPORTED_PROTOCOLS      0x00000003      /* minor versions supported */
  23
  24 #define RDS_IB_RECYCLE_BATCH_COUNT      32
  25
  26 #define RDS_IB_WC_MAX                   32
  27
  28 extern struct rw_semaphore rds_ib_devices_lock;
  29 extern struct list_head rds_ib_devices;
  30
  31 /*
  32  * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
  33  * try and minimize the amount of memory tied up both the device and
  34  * socket receive queues.
  35  */
  36 struct rds_page_frag {
  37         struct list_head        f_item;
  38         struct list_head        f_cache_entry;
  39         struct scatterlist      f_sg;
  40 };
  41
  42 struct rds_ib_incoming {
  43         struct list_head        ii_frags;
  44         struct list_head        ii_cache_entry;
  45         struct rds_incoming     ii_inc;
  46 };
  47
  48 struct rds_ib_cache_head {
  49         struct list_head *first;
  50         unsigned long count;
  51 };
  52
  53 struct rds_ib_refill_cache {
  54         struct rds_ib_cache_head __percpu *percpu;
  55         struct list_head         *xfer;
  56         struct list_head         *ready;
  57 };
  58
  59 struct rds_ib_connect_private {
  60         /* Add new fields at the end, and don't permute existing fields. */
  61         __be32                  dp_saddr;
  62         __be32                  dp_daddr;
  63         u8                      dp_protocol_major;
  64         u8                      dp_protocol_minor;
  65         __be16                  dp_protocol_minor_mask; /* bitmask */
  66         __be32                  dp_reserved1;
  67         __be64                  dp_ack_seq;
  68         __be32                  dp_credit;              /* non-zero enables flow ctl */
  69 };
  70
  71 struct rds_ib_send_work {
  72         void                    *s_op;
  73         union {
  74                 struct ib_send_wr       s_wr;
  75                 struct ib_rdma_wr       s_rdma_wr;
  76                 struct ib_atomic_wr     s_atomic_wr;
  77         };
  78         struct ib_sge           s_sge[RDS_IB_MAX_SGE];
  79         unsigned long           s_queued;
  80 };
  81
  82 struct rds_ib_recv_work {
  83         struct rds_ib_incoming  *r_ibinc;
  84         struct rds_page_frag    *r_frag;
  85         struct ib_recv_wr       r_wr;
  86         struct ib_sge           r_sge[2];
  87 };
  88
  89 struct rds_ib_work_ring {
  90         u32             w_nr;
  91         u32             w_alloc_ptr;
  92         u32             w_alloc_ctr;
  93         u32             w_free_ptr;
  94         atomic_t        w_free_ctr;
  95 };
  96
  97 /* Rings are posted with all the allocations they'll need to queue the
  98  * incoming message to the receiving socket so this can't fail.
  99  * All fragments start with a header, so we can make sure we're not receiving
 100  * garbage, and we can tell a small 8 byte fragment from an ACK frame.
 101  */
 102 struct rds_ib_ack_state {
 103         u64             ack_next;
 104         u64             ack_recv;
 105         unsigned int    ack_required:1;
 106         unsigned int    ack_next_valid:1;
 107         unsigned int    ack_recv_valid:1;
 108 };
 109
 110
 111 struct rds_ib_device;
 112
 113 struct rds_ib_connection {
 114
 115         struct list_head        ib_node;
 116         struct rds_ib_device    *rds_ibdev;
 117         struct rds_connection   *conn;
 118
 119         /* alphabet soup, IBTA style */
 120         struct rdma_cm_id       *i_cm_id;
 121         struct ib_pd            *i_pd;
 122         struct ib_cq            *i_send_cq;
 123         struct ib_cq            *i_recv_cq;
 124         struct ib_wc            i_send_wc[RDS_IB_WC_MAX];
 125         struct ib_wc            i_recv_wc[RDS_IB_WC_MAX];
 126
 127         /* To control the number of wrs from fastreg */
 128         atomic_t                i_fastreg_wrs;
 129         atomic_t                i_fastunreg_wrs;
 130
 131         /* interrupt handling */
 132         struct tasklet_struct   i_send_tasklet;
 133         struct tasklet_struct   i_recv_tasklet;
 134
 135         /* tx */
 136         struct rds_ib_work_ring i_send_ring;
 137         struct rm_data_op       *i_data_op;
 138         struct rds_header       *i_send_hdrs;
 139         u64                     i_send_hdrs_dma;
 140         struct rds_ib_send_work *i_sends;
 141         atomic_t                i_signaled_sends;
 142
 143         /* rx */
 144         struct mutex            i_recv_mutex;
 145         struct rds_ib_work_ring i_recv_ring;
 146         struct rds_ib_incoming  *i_ibinc;
 147         u32                     i_recv_data_rem;
 148         struct rds_header       *i_recv_hdrs;
 149         u64                     i_recv_hdrs_dma;
 150         struct rds_ib_recv_work *i_recvs;
 151         u64                     i_ack_recv;     /* last ACK received */
 152         struct rds_ib_refill_cache i_cache_incs;
 153         struct rds_ib_refill_cache i_cache_frags;
 154         atomic_t                i_cache_allocs;
 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         /* Endpoint role in connection */
 187         bool                    i_active_side;
 188         atomic_t                i_cq_quiesce;
 189
 190         /* Send/Recv vectors */
 191         int                     i_scq_vector;
 192         int                     i_rcq_vector;
 193 };
 194
 195 /* This assumes that atomic_t is at least 32 bits */
 196 #define IB_GET_SEND_CREDITS(v)  ((v) & 0xffff)
 197 #define IB_GET_POST_CREDITS(v)  ((v) >> 16)
 198 #define IB_SET_SEND_CREDITS(v)  ((v) & 0xffff)
 199 #define IB_SET_POST_CREDITS(v)  ((v) << 16)
 200
 201 struct rds_ib_ipaddr {
 202         struct list_head        list;
 203         __be32                  ipaddr;
 204         struct rcu_head         rcu;
 205 };
 206
 207 enum {
 208         RDS_IB_MR_8K_POOL,
 209         RDS_IB_MR_1M_POOL,
 210 };
 211
 212 struct rds_ib_device {
 213         struct list_head        list;
 214         struct list_head        ipaddr_list;
 215         struct list_head        conn_list;
 216         struct ib_device        *dev;
 217         struct ib_pd            *pd;
 218         bool                    has_fmr;
 219         bool                    has_fr;
 220         bool                    use_fastreg;
 221
 222         unsigned int            max_mrs;
 223         struct rds_ib_mr_pool   *mr_1m_pool;
 224         struct rds_ib_mr_pool   *mr_8k_pool;
 225         unsigned int            fmr_max_remaps;
 226         unsigned int            max_8k_mrs;
 227         unsigned int            max_1m_mrs;
 228         int                     max_sge;
 229         unsigned int            max_wrs;
 230         unsigned int            max_initiator_depth;
 231         unsigned int            max_responder_resources;
 232         spinlock_t              spinlock;       /* protect the above */
 233         atomic_t                refcount;
 234         struct work_struct      free_work;
 235         int                     *vector_load;
 236 };
 237
 238 #define ibdev_to_node(ibdev) dev_to_node(ibdev->dma_device)
 239 #define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)
 240
 241 /* bits for i_ack_flags */
 242 #define IB_ACK_IN_FLIGHT        0
 243 #define IB_ACK_REQUESTED        1
 244
 245 /* Magic WR_ID for ACKs */
 246 #define RDS_IB_ACK_WR_ID        (~(u64) 0)
 247
 248 struct rds_ib_statistics {
 249         uint64_t        s_ib_connect_raced;
 250         uint64_t        s_ib_listen_closed_stale;
 251         uint64_t        s_ib_evt_handler_call;
 252         uint64_t        s_ib_tasklet_call;
 253         uint64_t        s_ib_tx_cq_event;
 254         uint64_t        s_ib_tx_ring_full;
 255         uint64_t        s_ib_tx_throttle;
 256         uint64_t        s_ib_tx_sg_mapping_failure;
 257         uint64_t        s_ib_tx_stalled;
 258         uint64_t        s_ib_tx_credit_updates;
 259         uint64_t        s_ib_rx_cq_event;
 260         uint64_t        s_ib_rx_ring_empty;
 261         uint64_t        s_ib_rx_refill_from_cq;
 262         uint64_t        s_ib_rx_refill_from_thread;
 263         uint64_t        s_ib_rx_alloc_limit;
 264         uint64_t        s_ib_rx_total_frags;
 265         uint64_t        s_ib_rx_total_incs;
 266         uint64_t        s_ib_rx_credit_updates;
 267         uint64_t        s_ib_ack_sent;
 268         uint64_t        s_ib_ack_send_failure;
 269         uint64_t        s_ib_ack_send_delayed;
 270         uint64_t        s_ib_ack_send_piggybacked;
 271         uint64_t        s_ib_ack_received;
 272         uint64_t        s_ib_rdma_mr_8k_alloc;
 273         uint64_t        s_ib_rdma_mr_8k_free;
 274         uint64_t        s_ib_rdma_mr_8k_used;
 275         uint64_t        s_ib_rdma_mr_8k_pool_flush;
 276         uint64_t        s_ib_rdma_mr_8k_pool_wait;
 277         uint64_t        s_ib_rdma_mr_8k_pool_depleted;
 278         uint64_t        s_ib_rdma_mr_1m_alloc;
 279         uint64_t        s_ib_rdma_mr_1m_free;
 280         uint64_t        s_ib_rdma_mr_1m_used;
 281         uint64_t        s_ib_rdma_mr_1m_pool_flush;
 282         uint64_t        s_ib_rdma_mr_1m_pool_wait;
 283         uint64_t        s_ib_rdma_mr_1m_pool_depleted;
 284         uint64_t        s_ib_rdma_mr_8k_reused;
 285         uint64_t        s_ib_rdma_mr_1m_reused;
 286         uint64_t        s_ib_atomic_cswp;
 287         uint64_t        s_ib_atomic_fadd;
 288         uint64_t        s_ib_recv_added_to_cache;
 289         uint64_t        s_ib_recv_removed_from_cache;
 290 };
 291
 292 extern struct workqueue_struct *rds_ib_wq;
 293
 294 /*
 295  * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
 296  * doesn't define it.
 297  */
 298 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
 299                                               struct scatterlist *sglist,
 300                                               unsigned int sg_dma_len,
 301                                               int direction)
 302 {
 303         struct scatterlist *sg;
 304         unsigned int i;
 305
 306         for_each_sg(sglist, sg, sg_dma_len, i) {
 307                 ib_dma_sync_single_for_cpu(dev,
 308                                 ib_sg_dma_address(dev, sg),
 309                                 ib_sg_dma_len(dev, sg),
 310                                 direction);
 311         }
 312 }
 313 #define ib_dma_sync_sg_for_cpu  rds_ib_dma_sync_sg_for_cpu
 314
 315 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
 316                                                  struct scatterlist *sglist,
 317                                                  unsigned int sg_dma_len,
 318                                                  int direction)
 319 {
 320         struct scatterlist *sg;
 321         unsigned int i;
 322
 323         for_each_sg(sglist, sg, sg_dma_len, i) {
 324                 ib_dma_sync_single_for_device(dev,
 325                                 ib_sg_dma_address(dev, sg),
 326                                 ib_sg_dma_len(dev, sg),
 327                                 direction);
 328         }
 329 }
 330 #define ib_dma_sync_sg_for_device       rds_ib_dma_sync_sg_for_device
 331
 332
 333 /* ib.c */
 334 extern struct rds_transport rds_ib_transport;
 335 struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device);
 336 void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
 337 extern struct ib_client rds_ib_client;
 338
 339 extern unsigned int rds_ib_retry_count;
 340
 341 extern spinlock_t ib_nodev_conns_lock;
 342 extern struct list_head ib_nodev_conns;
 343
 344 /* ib_cm.c */
 345 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
 346 void rds_ib_conn_free(void *arg);
 347 int rds_ib_conn_path_connect(struct rds_conn_path *cp);
 348 void rds_ib_conn_path_shutdown(struct rds_conn_path *cp);
 349 void rds_ib_state_change(struct sock *sk);
 350 int rds_ib_listen_init(void);
 351 void rds_ib_listen_stop(void);
 352 __printf(2, 3)
 353 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
 354 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
 355                              struct rdma_cm_event *event);
 356 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
 357 void rds_ib_cm_connect_complete(struct rds_connection *conn,
 358                                 struct rdma_cm_event *event);
 359
 360
 361 #define rds_ib_conn_error(conn, fmt...) \
 362         __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
 363
 364 /* ib_rdma.c */
 365 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
 366 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 367 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 368 void rds_ib_destroy_nodev_conns(void);
 369 void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
 370
 371 /* ib_recv.c */
 372 int rds_ib_recv_init(void);
 373 void rds_ib_recv_exit(void);
 374 int rds_ib_recv_path(struct rds_conn_path *conn);
 375 int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic);
 376 void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
 377 void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp);
 378 void rds_ib_inc_free(struct rds_incoming *inc);
 379 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
 380 void rds_ib_recv_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc,
 381                              struct rds_ib_ack_state *state);
 382 void rds_ib_recv_tasklet_fn(unsigned long data);
 383 void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
 384 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
 385 void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
 386 void rds_ib_attempt_ack(struct rds_ib_connection *ic);
 387 void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
 388 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
 389 void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required);
 390
 391 /* ib_ring.c */
 392 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
 393 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
 394 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
 395 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
 396 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
 397 int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
 398 int rds_ib_ring_low(struct rds_ib_work_ring *ring);
 399 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
 400 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
 401 extern wait_queue_head_t rds_ib_ring_empty_wait;
 402
 403 /* ib_send.c */
 404 void rds_ib_xmit_path_complete(struct rds_conn_path *cp);
 405 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
 406                 unsigned int hdr_off, unsigned int sg, unsigned int off);
 407 void rds_ib_send_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
 408 void rds_ib_send_init_ring(struct rds_ib_connection *ic);
 409 void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
 410 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
 411 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
 412 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
 413 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
 414                              u32 *adv_credits, int need_posted, int max_posted);
 415 int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
 416
 417 /* ib_stats.c */
 418 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
 419 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
 420 #define rds_ib_stats_add(member, count) \
 421                 rds_stats_add_which(rds_ib_stats, member, count)
 422 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
 423                                     unsigned int avail);
 424
 425 /* ib_sysctl.c */
 426 int rds_ib_sysctl_init(void);
 427 void rds_ib_sysctl_exit(void);
 428 extern unsigned long rds_ib_sysctl_max_send_wr;
 429 extern unsigned long rds_ib_sysctl_max_recv_wr;
 430 extern unsigned long rds_ib_sysctl_max_unsig_wrs;
 431 extern unsigned long rds_ib_sysctl_max_unsig_bytes;
 432 extern unsigned long rds_ib_sysctl_max_recv_allocation;
 433 extern unsigned int rds_ib_sysctl_flow_control;
 434
 435 #endif