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