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            512
  18
  19 #define RDS_IB_DEFAULT_RETRY_COUNT      2
  20
  21 #define RDS_IB_SUPPORTED_PROTOCOLS      0x00000003      /* minor versions supported */
  22
  23 #define RDS_IB_RECYCLE_BATCH_COUNT      32
  24
  25 #define RDS_IB_WC_MAX                   32
  26
  27 extern struct rw_semaphore rds_ib_devices_lock;
  28 extern struct list_head rds_ib_devices;
  29
  30 /*
  31  * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
  32  * try and minimize the amount of memory tied up both the device and
  33  * socket receive queues.
  34  */
  35 struct rds_page_frag {
  36         struct list_head        f_item;
  37         struct list_head        f_cache_entry;
  38         struct scatterlist      f_sg;
  39 };
  40
  41 struct rds_ib_incoming {
  42         struct list_head        ii_frags;
  43         struct list_head        ii_cache_entry;
  44         struct rds_incoming     ii_inc;
  45 };
  46
  47 struct rds_ib_cache_head {
  48         struct list_head *first;
  49         unsigned long count;
  50 };
  51
  52 struct rds_ib_refill_cache {
  53         struct rds_ib_cache_head __percpu *percpu;
  54         struct list_head         *xfer;
  55         struct list_head         *ready;
  56 };
  57
  58 struct rds_ib_connect_private {
  59         /* Add new fields at the end, and don't permute existing fields. */
  60         __be32                  dp_saddr;
  61         __be32                  dp_daddr;
  62         u8                      dp_protocol_major;
  63         u8                      dp_protocol_minor;
  64         __be16                  dp_protocol_minor_mask; /* bitmask */
  65         __be32                  dp_reserved1;
  66         __be64                  dp_ack_seq;
  67         __be32                  dp_credit;              /* non-zero enables flow ctl */
  68 };
  69
  70 struct rds_ib_send_work {
  71         void                    *s_op;
  72         union {
  73                 struct ib_send_wr       s_wr;
  74                 struct ib_rdma_wr       s_rdma_wr;
  75                 struct ib_atomic_wr     s_atomic_wr;
  76         };
  77         struct ib_sge           s_sge[RDS_IB_MAX_SGE];
  78         unsigned long           s_queued;
  79 };
  80
  81 struct rds_ib_recv_work {
  82         struct rds_ib_incoming  *r_ibinc;
  83         struct rds_page_frag    *r_frag;
  84         struct ib_recv_wr       r_wr;
  85         struct ib_sge           r_sge[2];
  86 };
  87
  88 struct rds_ib_work_ring {
  89         u32             w_nr;
  90         u32             w_alloc_ptr;
  91         u32             w_alloc_ctr;
  92         u32             w_free_ptr;
  93         atomic_t        w_free_ctr;
  94 };
  95
  96 /* Rings are posted with all the allocations they'll need to queue the
  97  * incoming message to the receiving socket so this can't fail.
  98  * All fragments start with a header, so we can make sure we're not receiving
  99  * garbage, and we can tell a small 8 byte fragment from an ACK frame.
 100  */
 101 struct rds_ib_ack_state {
 102         u64             ack_next;
 103         u64             ack_recv;
 104         unsigned int    ack_required:1;
 105         unsigned int    ack_next_valid:1;
 106         unsigned int    ack_recv_valid:1;
 107 };
 108
 109
 110 struct rds_ib_device;
 111
 112 struct rds_ib_connection {
 113
 114         struct list_head        ib_node;
 115         struct rds_ib_device    *rds_ibdev;
 116         struct rds_connection   *conn;
 117
 118         /* alphabet soup, IBTA style */
 119         struct rdma_cm_id       *i_cm_id;
 120         struct ib_pd            *i_pd;
 121         struct ib_cq            *i_send_cq;
 122         struct ib_cq            *i_recv_cq;
 123         struct ib_wc            i_send_wc[RDS_IB_WC_MAX];
 124         struct ib_wc            i_recv_wc[RDS_IB_WC_MAX];
 125
 126         /* To control the number of wrs from fastreg */
 127         atomic_t                i_fastreg_wrs;
 128
 129         /* interrupt handling */
 130         struct tasklet_struct   i_send_tasklet;
 131         struct tasklet_struct   i_recv_tasklet;
 132
 133         /* tx */
 134         struct rds_ib_work_ring i_send_ring;
 135         struct rm_data_op       *i_data_op;
 136         struct rds_header       *i_send_hdrs;
 137         u64                     i_send_hdrs_dma;
 138         struct rds_ib_send_work *i_sends;
 139         atomic_t                i_signaled_sends;
 140
 141         /* rx */
 142         struct mutex            i_recv_mutex;
 143         struct rds_ib_work_ring i_recv_ring;
 144         struct rds_ib_incoming  *i_ibinc;
 145         u32                     i_recv_data_rem;
 146         struct rds_header       *i_recv_hdrs;
 147         u64                     i_recv_hdrs_dma;
 148         struct rds_ib_recv_work *i_recvs;
 149         u64                     i_ack_recv;     /* last ACK received */
 150         struct rds_ib_refill_cache i_cache_incs;
 151         struct rds_ib_refill_cache i_cache_frags;
 152
 153         /* sending acks */
 154         unsigned long           i_ack_flags;
 155 #ifdef KERNEL_HAS_ATOMIC64
 156         atomic64_t              i_ack_next;     /* next ACK to send */
 157 #else
 158         spinlock_t              i_ack_lock;     /* protect i_ack_next */
 159         u64                     i_ack_next;     /* next ACK to send */
 160 #endif
 161         struct rds_header       *i_ack;
 162         struct ib_send_wr       i_ack_wr;
 163         struct ib_sge           i_ack_sge;
 164         u64                     i_ack_dma;
 165         unsigned long           i_ack_queued;
 166
 167         /* Flow control related information
 168          *
 169          * Our algorithm uses a pair variables that we need to access
 170          * atomically - one for the send credits, and one posted
 171          * recv credits we need to transfer to remote.
 172          * Rather than protect them using a slow spinlock, we put both into
 173          * a single atomic_t and update it using cmpxchg
 174          */
 175         atomic_t                i_credits;
 176
 177         /* Protocol version specific information */
 178         unsigned int            i_flowctl:1;    /* enable/disable flow ctl */
 179
 180         /* Batched completions */
 181         unsigned int            i_unsignaled_wrs;
 182 };
 183
 184 /* This assumes that atomic_t is at least 32 bits */
 185 #define IB_GET_SEND_CREDITS(v)  ((v) & 0xffff)
 186 #define IB_GET_POST_CREDITS(v)  ((v) >> 16)
 187 #define IB_SET_SEND_CREDITS(v)  ((v) & 0xffff)
 188 #define IB_SET_POST_CREDITS(v)  ((v) << 16)
 189
 190 struct rds_ib_ipaddr {
 191         struct list_head        list;
 192         __be32                  ipaddr;
 193         struct rcu_head         rcu;
 194 };
 195
 196 enum {
 197         RDS_IB_MR_8K_POOL,
 198         RDS_IB_MR_1M_POOL,
 199 };
 200
 201 struct rds_ib_device {
 202         struct list_head        list;
 203         struct list_head        ipaddr_list;
 204         struct list_head        conn_list;
 205         struct ib_device        *dev;
 206         struct ib_pd            *pd;
 207         bool                    has_fmr;
 208         bool                    has_fr;
 209         bool                    use_fastreg;
 210
 211         unsigned int            max_mrs;
 212         struct rds_ib_mr_pool   *mr_1m_pool;
 213         struct rds_ib_mr_pool   *mr_8k_pool;
 214         unsigned int            fmr_max_remaps;
 215         unsigned int            max_8k_mrs;
 216         unsigned int            max_1m_mrs;
 217         int                     max_sge;
 218         unsigned int            max_wrs;
 219         unsigned int            max_initiator_depth;
 220         unsigned int            max_responder_resources;
 221         spinlock_t              spinlock;       /* protect the above */
 222         atomic_t                refcount;
 223         struct work_struct      free_work;
 224 };
 225
 226 #define ibdev_to_node(ibdev) dev_to_node(ibdev->dma_device)
 227 #define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)
 228
 229 /* bits for i_ack_flags */
 230 #define IB_ACK_IN_FLIGHT        0
 231 #define IB_ACK_REQUESTED        1
 232
 233 /* Magic WR_ID for ACKs */
 234 #define RDS_IB_ACK_WR_ID        (~(u64) 0)
 235
 236 struct rds_ib_statistics {
 237         uint64_t        s_ib_connect_raced;
 238         uint64_t        s_ib_listen_closed_stale;
 239         uint64_t        s_ib_evt_handler_call;
 240         uint64_t        s_ib_tasklet_call;
 241         uint64_t        s_ib_tx_cq_event;
 242         uint64_t        s_ib_tx_ring_full;
 243         uint64_t        s_ib_tx_throttle;
 244         uint64_t        s_ib_tx_sg_mapping_failure;
 245         uint64_t        s_ib_tx_stalled;
 246         uint64_t        s_ib_tx_credit_updates;
 247         uint64_t        s_ib_rx_cq_event;
 248         uint64_t        s_ib_rx_ring_empty;
 249         uint64_t        s_ib_rx_refill_from_cq;
 250         uint64_t        s_ib_rx_refill_from_thread;
 251         uint64_t        s_ib_rx_alloc_limit;
 252         uint64_t        s_ib_rx_credit_updates;
 253         uint64_t        s_ib_ack_sent;
 254         uint64_t        s_ib_ack_send_failure;
 255         uint64_t        s_ib_ack_send_delayed;
 256         uint64_t        s_ib_ack_send_piggybacked;
 257         uint64_t        s_ib_ack_received;
 258         uint64_t        s_ib_rdma_mr_8k_alloc;
 259         uint64_t        s_ib_rdma_mr_8k_free;
 260         uint64_t        s_ib_rdma_mr_8k_used;
 261         uint64_t        s_ib_rdma_mr_8k_pool_flush;
 262         uint64_t        s_ib_rdma_mr_8k_pool_wait;
 263         uint64_t        s_ib_rdma_mr_8k_pool_depleted;
 264         uint64_t        s_ib_rdma_mr_1m_alloc;
 265         uint64_t        s_ib_rdma_mr_1m_free;
 266         uint64_t        s_ib_rdma_mr_1m_used;
 267         uint64_t        s_ib_rdma_mr_1m_pool_flush;
 268         uint64_t        s_ib_rdma_mr_1m_pool_wait;
 269         uint64_t        s_ib_rdma_mr_1m_pool_depleted;
 270         uint64_t        s_ib_rdma_mr_8k_reused;
 271         uint64_t        s_ib_rdma_mr_1m_reused;
 272         uint64_t        s_ib_atomic_cswp;
 273         uint64_t        s_ib_atomic_fadd;
 274 };
 275
 276 extern struct workqueue_struct *rds_ib_wq;
 277
 278 /*
 279  * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
 280  * doesn't define it.
 281  */
 282 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
 283                                               struct scatterlist *sglist,
 284                                               unsigned int sg_dma_len,
 285                                               int direction)
 286 {
 287         struct scatterlist *sg;
 288         unsigned int i;
 289
 290         for_each_sg(sglist, sg, sg_dma_len, i) {
 291                 ib_dma_sync_single_for_cpu(dev,
 292                                 ib_sg_dma_address(dev, sg),
 293                                 ib_sg_dma_len(dev, sg),
 294                                 direction);
 295         }
 296 }
 297 #define ib_dma_sync_sg_for_cpu  rds_ib_dma_sync_sg_for_cpu
 298
 299 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
 300                                                  struct scatterlist *sglist,
 301                                                  unsigned int sg_dma_len,
 302                                                  int direction)
 303 {
 304         struct scatterlist *sg;
 305         unsigned int i;
 306
 307         for_each_sg(sglist, sg, sg_dma_len, i) {
 308                 ib_dma_sync_single_for_device(dev,
 309                                 ib_sg_dma_address(dev, sg),
 310                                 ib_sg_dma_len(dev, sg),
 311                                 direction);
 312         }
 313 }
 314 #define ib_dma_sync_sg_for_device       rds_ib_dma_sync_sg_for_device
 315
 316
 317 /* ib.c */
 318 extern struct rds_transport rds_ib_transport;
 319 struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device);
 320 void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
 321 extern struct ib_client rds_ib_client;
 322
 323 extern unsigned int rds_ib_retry_count;
 324
 325 extern spinlock_t ib_nodev_conns_lock;
 326 extern struct list_head ib_nodev_conns;
 327
 328 /* ib_cm.c */
 329 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
 330 void rds_ib_conn_free(void *arg);
 331 int rds_ib_conn_path_connect(struct rds_conn_path *cp);
 332 void rds_ib_conn_path_shutdown(struct rds_conn_path *cp);
 333 void rds_ib_state_change(struct sock *sk);
 334 int rds_ib_listen_init(void);
 335 void rds_ib_listen_stop(void);
 336 __printf(2, 3)
 337 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
 338 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
 339                              struct rdma_cm_event *event);
 340 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
 341 void rds_ib_cm_connect_complete(struct rds_connection *conn,
 342                                 struct rdma_cm_event *event);
 343
 344
 345 #define rds_ib_conn_error(conn, fmt...) \
 346         __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
 347
 348 /* ib_rdma.c */
 349 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
 350 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 351 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 352 void rds_ib_destroy_nodev_conns(void);
 353 void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
 354
 355 /* ib_recv.c */
 356 int rds_ib_recv_init(void);
 357 void rds_ib_recv_exit(void);
 358 int rds_ib_recv_path(struct rds_conn_path *conn);
 359 int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic);
 360 void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
 361 void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp);
 362 void rds_ib_inc_free(struct rds_incoming *inc);
 363 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
 364 void rds_ib_recv_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc,
 365                              struct rds_ib_ack_state *state);
 366 void rds_ib_recv_tasklet_fn(unsigned long data);
 367 void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
 368 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
 369 void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
 370 void rds_ib_attempt_ack(struct rds_ib_connection *ic);
 371 void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
 372 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
 373 void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required);
 374
 375 /* ib_ring.c */
 376 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
 377 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
 378 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
 379 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
 380 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
 381 int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
 382 int rds_ib_ring_low(struct rds_ib_work_ring *ring);
 383 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
 384 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
 385 extern wait_queue_head_t rds_ib_ring_empty_wait;
 386
 387 /* ib_send.c */
 388 void rds_ib_xmit_path_complete(struct rds_conn_path *cp);
 389 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
 390                 unsigned int hdr_off, unsigned int sg, unsigned int off);
 391 void rds_ib_send_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
 392 void rds_ib_send_init_ring(struct rds_ib_connection *ic);
 393 void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
 394 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
 395 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
 396 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
 397 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
 398                              u32 *adv_credits, int need_posted, int max_posted);
 399 int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
 400
 401 /* ib_stats.c */
 402 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
 403 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
 404 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
 405                                     unsigned int avail);
 406
 407 /* ib_sysctl.c */
 408 int rds_ib_sysctl_init(void);
 409 void rds_ib_sysctl_exit(void);
 410 extern unsigned long rds_ib_sysctl_max_send_wr;
 411 extern unsigned long rds_ib_sysctl_max_recv_wr;
 412 extern unsigned long rds_ib_sysctl_max_unsig_wrs;
 413 extern unsigned long rds_ib_sysctl_max_unsig_bytes;
 414 extern unsigned long rds_ib_sysctl_max_recv_allocation;
 415 extern unsigned int rds_ib_sysctl_flow_control;
 416
 417 #endif