LXR linux/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
  27extern struct rw_semaphore rds_ib_devices_lock;
  28extern 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 */
  35struct rds_page_frag {
  36        struct list_head        f_item;
  37        struct list_head        f_cache_entry;
  38        struct scatterlist      f_sg;
  39};
  40
  41struct rds_ib_incoming {
  42        struct list_head        ii_frags;
  43        struct list_head        ii_cache_entry;
  44        struct rds_incoming     ii_inc;
  45};
  46
  47struct rds_ib_cache_head {
  48        struct list_head *first;
  49        unsigned long count;
  50};
  51
  52struct rds_ib_refill_cache {
  53        struct rds_ib_cache_head __percpu *percpu;
  54        struct list_head         *xfer;
  55        struct list_head         *ready;
  56};
  57
  58struct 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
  70struct 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
  81struct 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
  88struct 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 */
 101struct 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
 110struct rds_ib_device;
 111
 112struct 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
 190struct rds_ib_ipaddr {
 191        struct list_head        list;
 192        __be32                  ipaddr;
 193        struct rcu_head         rcu;
 194};
 195
 196enum {
 197        RDS_IB_MR_8K_POOL,
 198        RDS_IB_MR_1M_POOL,
 199};
 200
 201struct 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
 236struct 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
 276extern 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 */
 282static 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
 299static 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 */
 318extern struct rds_transport rds_ib_transport;
 319struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device);
 320void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
 321extern struct ib_client rds_ib_client;
 322
 323extern unsigned int rds_ib_retry_count;
 324
 325extern spinlock_t ib_nodev_conns_lock;
 326extern struct list_head ib_nodev_conns;
 327
 328/* ib_cm.c */
 329int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
 330void rds_ib_conn_free(void *arg);
 331int rds_ib_conn_connect(struct rds_connection *conn);
 332void rds_ib_conn_shutdown(struct rds_connection *conn);
 333void rds_ib_state_change(struct sock *sk);
 334int rds_ib_listen_init(void);
 335void rds_ib_listen_stop(void);
 336void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
 337int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
 338                             struct rdma_cm_event *event);
 339int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
 340void rds_ib_cm_connect_complete(struct rds_connection *conn,
 341                                struct rdma_cm_event *event);
 342
 343
 344#define rds_ib_conn_error(conn, fmt...) \
 345        __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
 346
 347/* ib_rdma.c */
 348int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
 349void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 350void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 351void rds_ib_destroy_nodev_conns(void);
 352void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
 353
 354/* ib_recv.c */
 355int rds_ib_recv_init(void);
 356void rds_ib_recv_exit(void);
 357int rds_ib_recv(struct rds_connection *conn);
 358int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic);
 359void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
 360void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp);
 361void rds_ib_inc_free(struct rds_incoming *inc);
 362int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
 363void rds_ib_recv_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc,
 364                             struct rds_ib_ack_state *state);
 365void rds_ib_recv_tasklet_fn(unsigned long data);
 366void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
 367void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
 368void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
 369void rds_ib_attempt_ack(struct rds_ib_connection *ic);
 370void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
 371u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
 372void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required);
 373
 374/* ib_ring.c */
 375void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
 376void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
 377u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
 378void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
 379void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
 380int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
 381int rds_ib_ring_low(struct rds_ib_work_ring *ring);
 382u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
 383u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
 384extern wait_queue_head_t rds_ib_ring_empty_wait;
 385
 386/* ib_send.c */
 387void rds_ib_xmit_complete(struct rds_connection *conn);
 388int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
 389                unsigned int hdr_off, unsigned int sg, unsigned int off);
 390void rds_ib_send_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
 391void rds_ib_send_init_ring(struct rds_ib_connection *ic);
 392void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
 393int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
 394void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
 395void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
 396int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
 397                             u32 *adv_credits, int need_posted, int max_posted);
 398int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
 399
 400/* ib_stats.c */
 401DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
 402#define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
 403unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
 404                                    unsigned int avail);
 405
 406/* ib_sysctl.c */
 407int rds_ib_sysctl_init(void);
 408void rds_ib_sysctl_exit(void);
 409extern unsigned long rds_ib_sysctl_max_send_wr;
 410extern unsigned long rds_ib_sysctl_max_recv_wr;
 411extern unsigned long rds_ib_sysctl_max_unsig_wrs;
 412extern unsigned long rds_ib_sysctl_max_unsig_bytes;
 413extern unsigned long rds_ib_sysctl_max_recv_allocation;
 414extern unsigned int rds_ib_sysctl_flow_control;
 415
 416#endif
 417