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