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_SUPPORTED_PROTOCOLS      0x00000003      /* minor versions supported */
  19
  20 extern struct list_head rds_ib_devices;
  21
  22 /*
  23  * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
  24  * try and minimize the amount of memory tied up both the device and
  25  * socket receive queues.
  26  */
  27 /* page offset of the final full frag that fits in the page */
  28 #define RDS_PAGE_LAST_OFF (((PAGE_SIZE  / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE)
  29 struct rds_page_frag {
  30         struct list_head        f_item;
  31         struct page             *f_page;
  32         unsigned long           f_offset;
  33         dma_addr_t              f_mapped;
  34 };
  35
  36 struct rds_ib_incoming {
  37         struct list_head        ii_frags;
  38         struct rds_incoming     ii_inc;
  39 };
  40
  41 struct rds_ib_connect_private {
  42         /* Add new fields at the end, and don't permute existing fields. */
  43         __be32                  dp_saddr;
  44         __be32                  dp_daddr;
  45         u8                      dp_protocol_major;
  46         u8                      dp_protocol_minor;
  47         __be16                  dp_protocol_minor_mask; /* bitmask */
  48         __be32                  dp_reserved1;
  49         __be64                  dp_ack_seq;
  50         __be32                  dp_credit;              /* non-zero enables flow ctl */
  51 };
  52
  53 struct rds_ib_send_work {
  54         struct rds_message      *s_rm;
  55         struct rds_rdma_op      *s_op;
  56         struct ib_send_wr       s_wr;
  57         struct ib_sge           s_sge[RDS_IB_MAX_SGE];
  58         unsigned long           s_queued;
  59 };
  60
  61 struct rds_ib_recv_work {
  62         struct rds_ib_incoming  *r_ibinc;
  63         struct rds_page_frag    *r_frag;
  64         struct ib_recv_wr       r_wr;
  65         struct ib_sge           r_sge[2];
  66 };
  67
  68 struct rds_ib_work_ring {
  69         u32             w_nr;
  70         u32             w_alloc_ptr;
  71         u32             w_alloc_ctr;
  72         u32             w_free_ptr;
  73         atomic_t        w_free_ctr;
  74 };
  75
  76 struct rds_ib_device;
  77
  78 struct rds_ib_connection {
  79
  80         struct list_head        ib_node;
  81         struct rds_ib_device    *rds_ibdev;
  82         struct rds_connection   *conn;
  83
  84         /* alphabet soup, IBTA style */
  85         struct rdma_cm_id       *i_cm_id;
  86         struct ib_pd            *i_pd;
  87         struct ib_mr            *i_mr;
  88         struct ib_cq            *i_send_cq;
  89         struct ib_cq            *i_recv_cq;
  90
  91         /* tx */
  92         struct rds_ib_work_ring i_send_ring;
  93         struct rds_message      *i_rm;
  94         struct rds_header       *i_send_hdrs;
  95         u64                     i_send_hdrs_dma;
  96         struct rds_ib_send_work *i_sends;
  97
  98         /* rx */
  99         struct mutex            i_recv_mutex;
 100         struct rds_ib_work_ring i_recv_ring;
 101         struct rds_ib_incoming  *i_ibinc;
 102         u32                     i_recv_data_rem;
 103         struct rds_header       *i_recv_hdrs;
 104         u64                     i_recv_hdrs_dma;
 105         struct rds_ib_recv_work *i_recvs;
 106         struct rds_page_frag    i_frag;
 107         u64                     i_ack_recv;     /* last ACK received */
 108
 109         /* sending acks */
 110         unsigned long           i_ack_flags;
 111 #ifdef KERNEL_HAS_ATOMIC64
 112         atomic64_t              i_ack_next;     /* next ACK to send */
 113 #else
 114         spinlock_t              i_ack_lock;     /* protect i_ack_next */
 115         u64                     i_ack_next;     /* next ACK to send */
 116 #endif
 117         struct rds_header       *i_ack;
 118         struct ib_send_wr       i_ack_wr;
 119         struct ib_sge           i_ack_sge;
 120         u64                     i_ack_dma;
 121         unsigned long           i_ack_queued;
 122
 123         /* Flow control related information
 124          *
 125          * Our algorithm uses a pair variables that we need to access
 126          * atomically - one for the send credits, and one posted
 127          * recv credits we need to transfer to remote.
 128          * Rather than protect them using a slow spinlock, we put both into
 129          * a single atomic_t and update it using cmpxchg
 130          */
 131         atomic_t                i_credits;
 132
 133         /* Protocol version specific information */
 134         unsigned int            i_flowctl:1;    /* enable/disable flow ctl */
 135
 136         /* Batched completions */
 137         unsigned int            i_unsignaled_wrs;
 138         long                    i_unsignaled_bytes;
 139 };
 140
 141 /* This assumes that atomic_t is at least 32 bits */
 142 #define IB_GET_SEND_CREDITS(v)  ((v) & 0xffff)
 143 #define IB_GET_POST_CREDITS(v)  ((v) >> 16)
 144 #define IB_SET_SEND_CREDITS(v)  ((v) & 0xffff)
 145 #define IB_SET_POST_CREDITS(v)  ((v) << 16)
 146
 147 struct rds_ib_ipaddr {
 148         struct list_head        list;
 149         __be32                  ipaddr;
 150 };
 151
 152 struct rds_ib_device {
 153         struct list_head        list;
 154         struct list_head        ipaddr_list;
 155         struct list_head        conn_list;
 156         struct ib_device        *dev;
 157         struct ib_pd            *pd;
 158         struct ib_mr            *mr;
 159         struct rds_ib_mr_pool   *mr_pool;
 160         int                     fmr_page_shift;
 161         int                     fmr_page_size;
 162         u64                     fmr_page_mask;
 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
 251 extern spinlock_t ib_nodev_conns_lock;
 252 extern struct list_head ib_nodev_conns;
 253
 254 /* ib_cm.c */
 255 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
 256 void rds_ib_conn_free(void *arg);
 257 int rds_ib_conn_connect(struct rds_connection *conn);
 258 void rds_ib_conn_shutdown(struct rds_connection *conn);
 259 void rds_ib_state_change(struct sock *sk);
 260 int __init rds_ib_listen_init(void);
 261 void rds_ib_listen_stop(void);
 262 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
 263 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
 264                              struct rdma_cm_event *event);
 265 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
 266 void rds_ib_cm_connect_complete(struct rds_connection *conn,
 267                                 struct rdma_cm_event *event);
 268
 269
 270 #define rds_ib_conn_error(conn, fmt...) \
 271         __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
 272
 273 /* ib_rdma.c */
 274 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
 275 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 276 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 277 void __rds_ib_destroy_conns(struct list_head *list, spinlock_t *list_lock);
 278 static inline void rds_ib_destroy_nodev_conns(void)
 279 {
 280         __rds_ib_destroy_conns(&ib_nodev_conns, &ib_nodev_conns_lock);
 281 }
 282 static inline void rds_ib_destroy_conns(struct rds_ib_device *rds_ibdev)
 283 {
 284         __rds_ib_destroy_conns(&rds_ibdev->conn_list, &rds_ibdev->spinlock);
 285 }
 286 struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *);
 287 void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo);
 288 void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
 289 void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
 290                     struct rds_sock *rs, u32 *key_ret);
 291 void rds_ib_sync_mr(void *trans_private, int dir);
 292 void rds_ib_free_mr(void *trans_private, int invalidate);
 293 void rds_ib_flush_mrs(void);
 294
 295 /* ib_recv.c */
 296 int __init rds_ib_recv_init(void);
 297 void rds_ib_recv_exit(void);
 298 int rds_ib_recv(struct rds_connection *conn);
 299 int rds_ib_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp,
 300                        gfp_t page_gfp, int prefill);
 301 void rds_ib_inc_purge(struct rds_incoming *inc);
 302 void rds_ib_inc_free(struct rds_incoming *inc);
 303 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov,
 304                              size_t size);
 305 void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context);
 306 void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
 307 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
 308 void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
 309 void rds_ib_attempt_ack(struct rds_ib_connection *ic);
 310 void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
 311 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
 312
 313 /* ib_ring.c */
 314 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
 315 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
 316 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
 317 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
 318 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
 319 int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
 320 int rds_ib_ring_low(struct rds_ib_work_ring *ring);
 321 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
 322 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
 323 extern wait_queue_head_t rds_ib_ring_empty_wait;
 324
 325 /* ib_send.c */
 326 void rds_ib_xmit_complete(struct rds_connection *conn);
 327 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
 328                 unsigned int hdr_off, unsigned int sg, unsigned int off);
 329 void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context);
 330 void rds_ib_send_init_ring(struct rds_ib_connection *ic);
 331 void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
 332 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rds_rdma_op *op);
 333 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
 334 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
 335 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
 336                              u32 *adv_credits, int need_posted);
 337
 338 /* ib_stats.c */
 339 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
 340 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
 341 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
 342                                     unsigned int avail);
 343
 344 /* ib_sysctl.c */
 345 int __init rds_ib_sysctl_init(void);
 346 void rds_ib_sysctl_exit(void);
 347 extern unsigned long rds_ib_sysctl_max_send_wr;
 348 extern unsigned long rds_ib_sysctl_max_recv_wr;
 349 extern unsigned long rds_ib_sysctl_max_unsig_wrs;
 350 extern unsigned long rds_ib_sysctl_max_unsig_bytes;
 351 extern unsigned long rds_ib_sysctl_max_recv_allocation;
 352 extern unsigned int rds_ib_sysctl_flow_control;
 353 extern ctl_table rds_ib_sysctl_table[];
 354
 355 /*
 356  * Helper functions for getting/setting the header and data SGEs in
 357  * RDS packets (not RDMA)
 358  */
 359 static inline struct ib_sge *
 360 rds_ib_header_sge(struct rds_ib_connection *ic, struct ib_sge *sge)
 361 {
 362         return &sge[0];
 363 }
 364
 365 static inline struct ib_sge *
 366 rds_ib_data_sge(struct rds_ib_connection *ic, struct ib_sge *sge)
 367 {
 368         return &sge[1];
 369 }
 370
 371 #endif