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 "rds.h"
   7 #include "rdma_transport.h"
   8
   9 #define RDS_FMR_SIZE                    256
  10 #define RDS_FMR_POOL_SIZE               4096
  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 extern struct list_head rds_ib_devices;
  23
  24 /*
  25  * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
  26  * try and minimize the amount of memory tied up both the device and
  27  * socket receive queues.
  28  */
  29 /* page offset of the final full frag that fits in the page */
  30 #define RDS_PAGE_LAST_OFF (((PAGE_SIZE  / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE)
  31 struct rds_page_frag {
  32         struct list_head        f_item;
  33         struct page             *f_page;
  34         unsigned long           f_offset;
  35         dma_addr_t              f_mapped;
  36 };
  37
  38 struct rds_ib_incoming {
  39         struct list_head        ii_frags;
  40         struct rds_incoming     ii_inc;
  41 };
  42
  43 struct rds_ib_connect_private {
  44         /* Add new fields at the end, and don't permute existing fields. */
  45         __be32                  dp_saddr;
  46         __be32                  dp_daddr;
  47         u8                      dp_protocol_major;
  48         u8                      dp_protocol_minor;
  49         __be16                  dp_protocol_minor_mask; /* bitmask */
  50         __be32                  dp_reserved1;
  51         __be64                  dp_ack_seq;
  52         __be32                  dp_credit;              /* non-zero enables flow ctl */
  53 };
  54
  55 struct rds_ib_send_work {
  56         struct rds_message      *s_rm;
  57         struct rds_rdma_op      *s_op;
  58         struct ib_send_wr       s_wr;
  59         struct ib_sge           s_sge[RDS_IB_MAX_SGE];
  60         unsigned long           s_queued;
  61 };
  62
  63 struct rds_ib_recv_work {
  64         struct rds_ib_incoming  *r_ibinc;
  65         struct rds_page_frag    *r_frag;
  66         struct ib_recv_wr       r_wr;
  67         struct ib_sge           r_sge[2];
  68 };
  69
  70 struct rds_ib_work_ring {
  71         u32             w_nr;
  72         u32             w_alloc_ptr;
  73         u32             w_alloc_ctr;
  74         u32             w_free_ptr;
  75         atomic_t        w_free_ctr;
  76 };
  77
  78 struct rds_ib_device;
  79
  80 struct rds_ib_connection {
  81
  82         struct list_head        ib_node;
  83         struct rds_ib_device    *rds_ibdev;
  84         struct rds_connection   *conn;
  85
  86         /* alphabet soup, IBTA style */
  87         struct rdma_cm_id       *i_cm_id;
  88         struct ib_pd            *i_pd;
  89         struct ib_mr            *i_mr;
  90         struct ib_cq            *i_send_cq;
  91         struct ib_cq            *i_recv_cq;
  92
  93         /* tx */
  94         struct rds_ib_work_ring i_send_ring;
  95         struct rds_message      *i_rm;
  96         struct rds_header       *i_send_hdrs;
  97         u64                     i_send_hdrs_dma;
  98         struct rds_ib_send_work *i_sends;
  99
 100         /* rx */
 101         struct tasklet_struct   i_recv_tasklet;
 102         struct mutex            i_recv_mutex;
 103         struct rds_ib_work_ring i_recv_ring;
 104         struct rds_ib_incoming  *i_ibinc;
 105         u32                     i_recv_data_rem;
 106         struct rds_header       *i_recv_hdrs;
 107         u64                     i_recv_hdrs_dma;
 108         struct rds_ib_recv_work *i_recvs;
 109         struct rds_page_frag    i_frag;
 110         u64                     i_ack_recv;     /* last ACK received */
 111
 112         /* sending acks */
 113         unsigned long           i_ack_flags;
 114 #ifdef KERNEL_HAS_ATOMIC64
 115         atomic64_t              i_ack_next;     /* next ACK to send */
 116 #else
 117         spinlock_t              i_ack_lock;     /* protect i_ack_next */
 118         u64                     i_ack_next;     /* next ACK to send */
 119 #endif
 120         struct rds_header       *i_ack;
 121         struct ib_send_wr       i_ack_wr;
 122         struct ib_sge           i_ack_sge;
 123         u64                     i_ack_dma;
 124         unsigned long           i_ack_queued;
 125
 126         /* Flow control related information
 127          *
 128          * Our algorithm uses a pair variables that we need to access
 129          * atomically - one for the send credits, and one posted
 130          * recv credits we need to transfer to remote.
 131          * Rather than protect them using a slow spinlock, we put both into
 132          * a single atomic_t and update it using cmpxchg
 133          */
 134         atomic_t                i_credits;
 135
 136         /* Protocol version specific information */
 137         unsigned int            i_flowctl:1;    /* enable/disable flow ctl */
 138
 139         /* Batched completions */
 140         unsigned int            i_unsignaled_wrs;
 141         long                    i_unsignaled_bytes;
 142 };
 143
 144 /* This assumes that atomic_t is at least 32 bits */
 145 #define IB_GET_SEND_CREDITS(v)  ((v) & 0xffff)
 146 #define IB_GET_POST_CREDITS(v)  ((v) >> 16)
 147 #define IB_SET_SEND_CREDITS(v)  ((v) & 0xffff)
 148 #define IB_SET_POST_CREDITS(v)  ((v) << 16)
 149
 150 struct rds_ib_ipaddr {
 151         struct list_head        list;
 152         __be32                  ipaddr;
 153 };
 154
 155 struct rds_ib_device {
 156         struct list_head        list;
 157         struct list_head        ipaddr_list;
 158         struct list_head        conn_list;
 159         struct ib_device        *dev;
 160         struct ib_pd            *pd;
 161         struct ib_mr            *mr;
 162         struct rds_ib_mr_pool   *mr_pool;
 163         unsigned int            fmr_max_remaps;
 164         unsigned int            max_fmrs;
 165         int                     max_sge;
 166         unsigned int            max_wrs;
 167         spinlock_t              spinlock;       /* protect the above */
 168 };
 169
 170 /* bits for i_ack_flags */
 171 #define IB_ACK_IN_FLIGHT        0
 172 #define IB_ACK_REQUESTED        1
 173
 174 /* Magic WR_ID for ACKs */
 175 #define RDS_IB_ACK_WR_ID        (~(u64) 0)
 176
 177 struct rds_ib_statistics {
 178         uint64_t        s_ib_connect_raced;
 179         uint64_t        s_ib_listen_closed_stale;
 180         uint64_t        s_ib_tx_cq_call;
 181         uint64_t        s_ib_tx_cq_event;
 182         uint64_t        s_ib_tx_ring_full;
 183         uint64_t        s_ib_tx_throttle;
 184         uint64_t        s_ib_tx_sg_mapping_failure;
 185         uint64_t        s_ib_tx_stalled;
 186         uint64_t        s_ib_tx_credit_updates;
 187         uint64_t        s_ib_rx_cq_call;
 188         uint64_t        s_ib_rx_cq_event;
 189         uint64_t        s_ib_rx_ring_empty;
 190         uint64_t        s_ib_rx_refill_from_cq;
 191         uint64_t        s_ib_rx_refill_from_thread;
 192         uint64_t        s_ib_rx_alloc_limit;
 193         uint64_t        s_ib_rx_credit_updates;
 194         uint64_t        s_ib_ack_sent;
 195         uint64_t        s_ib_ack_send_failure;
 196         uint64_t        s_ib_ack_send_delayed;
 197         uint64_t        s_ib_ack_send_piggybacked;
 198         uint64_t        s_ib_ack_received;
 199         uint64_t        s_ib_rdma_mr_alloc;
 200         uint64_t        s_ib_rdma_mr_free;
 201         uint64_t        s_ib_rdma_mr_used;
 202         uint64_t        s_ib_rdma_mr_pool_flush;
 203         uint64_t        s_ib_rdma_mr_pool_wait;
 204         uint64_t        s_ib_rdma_mr_pool_depleted;
 205 };
 206
 207 extern struct workqueue_struct *rds_ib_wq;
 208
 209 /*
 210  * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
 211  * doesn't define it.
 212  */
 213 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
 214                 struct scatterlist *sg, unsigned int sg_dma_len, int direction)
 215 {
 216         unsigned int i;
 217
 218         for (i = 0; i < sg_dma_len; ++i) {
 219                 ib_dma_sync_single_for_cpu(dev,
 220                                 ib_sg_dma_address(dev, &sg[i]),
 221                                 ib_sg_dma_len(dev, &sg[i]),
 222                                 direction);
 223         }
 224 }
 225 #define ib_dma_sync_sg_for_cpu  rds_ib_dma_sync_sg_for_cpu
 226
 227 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
 228                 struct scatterlist *sg, unsigned int sg_dma_len, int direction)
 229 {
 230         unsigned int i;
 231
 232         for (i = 0; i < sg_dma_len; ++i) {
 233                 ib_dma_sync_single_for_device(dev,
 234                                 ib_sg_dma_address(dev, &sg[i]),
 235                                 ib_sg_dma_len(dev, &sg[i]),
 236                                 direction);
 237         }
 238 }
 239 #define ib_dma_sync_sg_for_device       rds_ib_dma_sync_sg_for_device
 240
 241
 242 /* ib.c */
 243 extern struct rds_transport rds_ib_transport;
 244 extern void rds_ib_add_one(struct ib_device *device);
 245 extern void rds_ib_remove_one(struct ib_device *device);
 246 extern struct ib_client rds_ib_client;
 247
 248 extern unsigned int fmr_pool_size;
 249 extern unsigned int fmr_message_size;
 250 extern unsigned int rds_ib_retry_count;
 251
 252 extern spinlock_t ib_nodev_conns_lock;
 253 extern struct list_head ib_nodev_conns;
 254
 255 /* ib_cm.c */
 256 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
 257 void rds_ib_conn_free(void *arg);
 258 int rds_ib_conn_connect(struct rds_connection *conn);
 259 void rds_ib_conn_shutdown(struct rds_connection *conn);
 260 void rds_ib_state_change(struct sock *sk);
 261 int __init rds_ib_listen_init(void);
 262 void rds_ib_listen_stop(void);
 263 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
 264 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
 265                              struct rdma_cm_event *event);
 266 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
 267 void rds_ib_cm_connect_complete(struct rds_connection *conn,
 268                                 struct rdma_cm_event *event);
 269
 270
 271 #define rds_ib_conn_error(conn, fmt...) \
 272         __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
 273
 274 /* ib_rdma.c */
 275 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
 276 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 277 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 278 void __rds_ib_destroy_conns(struct list_head *list, spinlock_t *list_lock);
 279 static inline void rds_ib_destroy_nodev_conns(void)
 280 {
 281         __rds_ib_destroy_conns(&ib_nodev_conns, &ib_nodev_conns_lock);
 282 }
 283 static inline void rds_ib_destroy_conns(struct rds_ib_device *rds_ibdev)
 284 {
 285         __rds_ib_destroy_conns(&rds_ibdev->conn_list, &rds_ibdev->spinlock);
 286 }
 287 struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *);
 288 void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo);
 289 void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
 290 void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
 291                     struct rds_sock *rs, u32 *key_ret);
 292 void rds_ib_sync_mr(void *trans_private, int dir);
 293 void rds_ib_free_mr(void *trans_private, int invalidate);
 294 void rds_ib_flush_mrs(void);
 295
 296 /* ib_recv.c */
 297 int __init rds_ib_recv_init(void);
 298 void rds_ib_recv_exit(void);
 299 int rds_ib_recv(struct rds_connection *conn);
 300 int rds_ib_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp,
 301                        gfp_t page_gfp, int prefill);
 302 void rds_ib_inc_purge(struct rds_incoming *inc);
 303 void rds_ib_inc_free(struct rds_incoming *inc);
 304 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov,
 305                              size_t size);
 306 void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context);
 307 void rds_ib_recv_tasklet_fn(unsigned long data);
 308 void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
 309 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
 310 void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
 311 void rds_ib_attempt_ack(struct rds_ib_connection *ic);
 312 void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
 313 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
 314
 315 /* ib_ring.c */
 316 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
 317 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
 318 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
 319 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
 320 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
 321 int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
 322 int rds_ib_ring_low(struct rds_ib_work_ring *ring);
 323 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
 324 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
 325 extern wait_queue_head_t rds_ib_ring_empty_wait;
 326
 327 /* ib_send.c */
 328 void rds_ib_xmit_complete(struct rds_connection *conn);
 329 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
 330                 unsigned int hdr_off, unsigned int sg, unsigned int off);
 331 void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context);
 332 void rds_ib_send_init_ring(struct rds_ib_connection *ic);
 333 void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
 334 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rds_rdma_op *op);
 335 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
 336 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
 337 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
 338                              u32 *adv_credits, int need_posted, int max_posted);
 339
 340 /* ib_stats.c */
 341 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
 342 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
 343 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
 344                                     unsigned int avail);
 345
 346 /* ib_sysctl.c */
 347 int __init rds_ib_sysctl_init(void);
 348 void rds_ib_sysctl_exit(void);
 349 extern unsigned long rds_ib_sysctl_max_send_wr;
 350 extern unsigned long rds_ib_sysctl_max_recv_wr;
 351 extern unsigned long rds_ib_sysctl_max_unsig_wrs;
 352 extern unsigned long rds_ib_sysctl_max_unsig_bytes;
 353 extern unsigned long rds_ib_sysctl_max_recv_allocation;
 354 extern unsigned int rds_ib_sysctl_flow_control;
 355 extern ctl_table rds_ib_sysctl_table[];
 356
 357 /*
 358  * Helper functions for getting/setting the header and data SGEs in
 359  * RDS packets (not RDMA)
 360  *
 361  * From version 3.1 onwards, header is in front of data in the sge.
 362  */
 363 static inline struct ib_sge *
 364 rds_ib_header_sge(struct rds_ib_connection *ic, struct ib_sge *sge)
 365 {
 366         if (ic->conn->c_version > RDS_PROTOCOL_3_0)
 367                 return &sge[0];
 368         else
 369                 return &sge[1];
 370 }
 371
 372 static inline struct ib_sge *
 373 rds_ib_data_sge(struct rds_ib_connection *ic, struct ib_sge *sge)
 374 {
 375         if (ic->conn->c_version > RDS_PROTOCOL_3_0)
 376                 return &sge[1];
 377         else
 378                 return &sge[0];
 379 }
 380
 381 #endif