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/pci.h>
   7 #include <linux/slab.h>
   8 #include "rds.h"
   9 #include "rdma_transport.h"
  10
  11 #define RDS_FMR_SIZE                    256
  12 #define RDS_FMR_POOL_SIZE               8192
  13
  14 #define RDS_IB_MAX_SGE                  8
  15 #define RDS_IB_RECV_SGE                 2
  16
  17 #define RDS_IB_DEFAULT_RECV_WR          1024
  18 #define RDS_IB_DEFAULT_SEND_WR          256
  19
  20 #define RDS_IB_DEFAULT_RETRY_COUNT      2
  21
  22 #define RDS_IB_SUPPORTED_PROTOCOLS      0x00000003      /* minor versions supported */
  23
  24 #define RDS_IB_RECYCLE_BATCH_COUNT      32
  25
  26 extern struct list_head rds_ib_devices;
  27
  28 /*
  29  * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
  30  * try and minimize the amount of memory tied up both the device and
  31  * socket receive queues.
  32  */
  33 struct rds_page_frag {
  34         struct list_head        f_item;
  35         struct list_head        f_cache_entry;
  36         struct scatterlist      f_sg;
  37 };
  38
  39 struct rds_ib_incoming {
  40         struct list_head        ii_frags;
  41         struct list_head        ii_cache_entry;
  42         struct rds_incoming     ii_inc;
  43 };
  44
  45 struct rds_ib_cache_head {
  46         struct list_head *first;
  47         unsigned long count;
  48 };
  49
  50 struct rds_ib_refill_cache {
  51         struct rds_ib_cache_head *percpu;
  52         struct list_head         *xfer;
  53         struct list_head         *ready;
  54 };
  55
  56 struct rds_ib_connect_private {
  57         /* Add new fields at the end, and don't permute existing fields. */
  58         __be32                  dp_saddr;
  59         __be32                  dp_daddr;
  60         u8                      dp_protocol_major;
  61         u8                      dp_protocol_minor;
  62         __be16                  dp_protocol_minor_mask; /* bitmask */
  63         __be32                  dp_reserved1;
  64         __be64                  dp_ack_seq;
  65         __be32                  dp_credit;              /* non-zero enables flow ctl */
  66 };
  67
  68 struct rds_ib_send_work {
  69         void                    *s_op;
  70         struct ib_send_wr       s_wr;
  71         struct ib_sge           s_sge[RDS_IB_MAX_SGE];
  72         unsigned long           s_queued;
  73 };
  74
  75 struct rds_ib_recv_work {
  76         struct rds_ib_incoming  *r_ibinc;
  77         struct rds_page_frag    *r_frag;
  78         struct ib_recv_wr       r_wr;
  79         struct ib_sge           r_sge[2];
  80 };
  81
  82 struct rds_ib_work_ring {
  83         u32             w_nr;
  84         u32             w_alloc_ptr;
  85         u32             w_alloc_ctr;
  86         u32             w_free_ptr;
  87         atomic_t        w_free_ctr;
  88 };
  89
  90 struct rds_ib_device;
  91
  92 struct rds_ib_connection {
  93
  94         struct list_head        ib_node;
  95         struct rds_ib_device    *rds_ibdev;
  96         struct rds_connection   *conn;
  97
  98         /* alphabet soup, IBTA style */
  99         struct rdma_cm_id       *i_cm_id;
 100         struct ib_pd            *i_pd;
 101         struct ib_mr            *i_mr;
 102         struct ib_cq            *i_send_cq;
 103         struct ib_cq            *i_recv_cq;
 104
 105         /* tx */
 106         struct rds_ib_work_ring i_send_ring;
 107         struct rm_data_op       *i_data_op;
 108         struct rds_header       *i_send_hdrs;
 109         u64                     i_send_hdrs_dma;
 110         struct rds_ib_send_work *i_sends;
 111
 112         /* rx */
 113         struct tasklet_struct   i_recv_tasklet;
 114         struct mutex            i_recv_mutex;
 115         struct rds_ib_work_ring i_recv_ring;
 116         struct rds_ib_incoming  *i_ibinc;
 117         u32                     i_recv_data_rem;
 118         struct rds_header       *i_recv_hdrs;
 119         u64                     i_recv_hdrs_dma;
 120         struct rds_ib_recv_work *i_recvs;
 121         u64                     i_ack_recv;     /* last ACK received */
 122         struct rds_ib_refill_cache i_cache_incs;
 123         struct rds_ib_refill_cache i_cache_frags;
 124
 125         /* sending acks */
 126         unsigned long           i_ack_flags;
 127 #ifdef KERNEL_HAS_ATOMIC64
 128         atomic64_t              i_ack_next;     /* next ACK to send */
 129 #else
 130         spinlock_t              i_ack_lock;     /* protect i_ack_next */
 131         u64                     i_ack_next;     /* next ACK to send */
 132 #endif
 133         struct rds_header       *i_ack;
 134         struct ib_send_wr       i_ack_wr;
 135         struct ib_sge           i_ack_sge;
 136         u64                     i_ack_dma;
 137         unsigned long           i_ack_queued;
 138
 139         /* Flow control related information
 140          *
 141          * Our algorithm uses a pair variables that we need to access
 142          * atomically - one for the send credits, and one posted
 143          * recv credits we need to transfer to remote.
 144          * Rather than protect them using a slow spinlock, we put both into
 145          * a single atomic_t and update it using cmpxchg
 146          */
 147         atomic_t                i_credits;
 148
 149         /* Protocol version specific information */
 150         unsigned int            i_flowctl:1;    /* enable/disable flow ctl */
 151
 152         /* Batched completions */
 153         unsigned int            i_unsignaled_wrs;
 154 };
 155
 156 /* This assumes that atomic_t is at least 32 bits */
 157 #define IB_GET_SEND_CREDITS(v)  ((v) & 0xffff)
 158 #define IB_GET_POST_CREDITS(v)  ((v) >> 16)
 159 #define IB_SET_SEND_CREDITS(v)  ((v) & 0xffff)
 160 #define IB_SET_POST_CREDITS(v)  ((v) << 16)
 161
 162 struct rds_ib_ipaddr {
 163         struct list_head        list;
 164         __be32                  ipaddr;
 165 };
 166
 167 struct rds_ib_device {
 168         struct list_head        list;
 169         struct list_head        ipaddr_list;
 170         struct list_head        conn_list;
 171         struct ib_device        *dev;
 172         struct ib_pd            *pd;
 173         struct ib_mr            *mr;
 174         struct rds_ib_mr_pool   *mr_pool;
 175         unsigned int            fmr_max_remaps;
 176         unsigned int            max_fmrs;
 177         int                     max_sge;
 178         unsigned int            max_wrs;
 179         unsigned int            max_initiator_depth;
 180         unsigned int            max_responder_resources;
 181         spinlock_t              spinlock;       /* protect the above */
 182         atomic_t                refcount;
 183         struct work_struct      free_work;
 184 };
 185
 186 #define pcidev_to_node(pcidev) pcibus_to_node(pcidev->bus)
 187 #define ibdev_to_node(ibdev) pcidev_to_node(to_pci_dev(ibdev->dma_device))
 188 #define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)
 189
 190 /* bits for i_ack_flags */
 191 #define IB_ACK_IN_FLIGHT        0
 192 #define IB_ACK_REQUESTED        1
 193
 194 /* Magic WR_ID for ACKs */
 195 #define RDS_IB_ACK_WR_ID        (~(u64) 0)
 196
 197 struct rds_ib_statistics {
 198         uint64_t        s_ib_connect_raced;
 199         uint64_t        s_ib_listen_closed_stale;
 200         uint64_t        s_ib_tx_cq_call;
 201         uint64_t        s_ib_tx_cq_event;
 202         uint64_t        s_ib_tx_ring_full;
 203         uint64_t        s_ib_tx_throttle;
 204         uint64_t        s_ib_tx_sg_mapping_failure;
 205         uint64_t        s_ib_tx_stalled;
 206         uint64_t        s_ib_tx_credit_updates;
 207         uint64_t        s_ib_rx_cq_call;
 208         uint64_t        s_ib_rx_cq_event;
 209         uint64_t        s_ib_rx_ring_empty;
 210         uint64_t        s_ib_rx_refill_from_cq;
 211         uint64_t        s_ib_rx_refill_from_thread;
 212         uint64_t        s_ib_rx_alloc_limit;
 213         uint64_t        s_ib_rx_credit_updates;
 214         uint64_t        s_ib_ack_sent;
 215         uint64_t        s_ib_ack_send_failure;
 216         uint64_t        s_ib_ack_send_delayed;
 217         uint64_t        s_ib_ack_send_piggybacked;
 218         uint64_t        s_ib_ack_received;
 219         uint64_t        s_ib_rdma_mr_alloc;
 220         uint64_t        s_ib_rdma_mr_free;
 221         uint64_t        s_ib_rdma_mr_used;
 222         uint64_t        s_ib_rdma_mr_pool_flush;
 223         uint64_t        s_ib_rdma_mr_pool_wait;
 224         uint64_t        s_ib_rdma_mr_pool_depleted;
 225         uint64_t        s_ib_atomic_cswp;
 226         uint64_t        s_ib_atomic_fadd;
 227 };
 228
 229 extern struct workqueue_struct *rds_ib_wq;
 230
 231 /*
 232  * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
 233  * doesn't define it.
 234  */
 235 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
 236                 struct scatterlist *sg, unsigned int sg_dma_len, int direction)
 237 {
 238         unsigned int i;
 239
 240         for (i = 0; i < sg_dma_len; ++i) {
 241                 ib_dma_sync_single_for_cpu(dev,
 242                                 ib_sg_dma_address(dev, &sg[i]),
 243                                 ib_sg_dma_len(dev, &sg[i]),
 244                                 direction);
 245         }
 246 }
 247 #define ib_dma_sync_sg_for_cpu  rds_ib_dma_sync_sg_for_cpu
 248
 249 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
 250                 struct scatterlist *sg, unsigned int sg_dma_len, int direction)
 251 {
 252         unsigned int i;
 253
 254         for (i = 0; i < sg_dma_len; ++i) {
 255                 ib_dma_sync_single_for_device(dev,
 256                                 ib_sg_dma_address(dev, &sg[i]),
 257                                 ib_sg_dma_len(dev, &sg[i]),
 258                                 direction);
 259         }
 260 }
 261 #define ib_dma_sync_sg_for_device       rds_ib_dma_sync_sg_for_device
 262
 263
 264 /* ib.c */
 265 extern struct rds_transport rds_ib_transport;
 266 extern void rds_ib_add_one(struct ib_device *device);
 267 extern void rds_ib_remove_one(struct ib_device *device);
 268 struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device);
 269 void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
 270 extern struct ib_client rds_ib_client;
 271
 272 extern unsigned int fmr_pool_size;
 273 extern unsigned int fmr_message_size;
 274 extern unsigned int rds_ib_retry_count;
 275
 276 extern spinlock_t ib_nodev_conns_lock;
 277 extern struct list_head ib_nodev_conns;
 278
 279 /* ib_cm.c */
 280 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
 281 void rds_ib_conn_free(void *arg);
 282 int rds_ib_conn_connect(struct rds_connection *conn);
 283 void rds_ib_conn_shutdown(struct rds_connection *conn);
 284 void rds_ib_state_change(struct sock *sk);
 285 int __init rds_ib_listen_init(void);
 286 void rds_ib_listen_stop(void);
 287 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
 288 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
 289                              struct rdma_cm_event *event);
 290 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
 291 void rds_ib_cm_connect_complete(struct rds_connection *conn,
 292                                 struct rdma_cm_event *event);
 293
 294
 295 #define rds_ib_conn_error(conn, fmt...) \
 296         __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
 297
 298 /* ib_rdma.c */
 299 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
 300 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 301 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 302 void __rds_ib_destroy_conns(struct list_head *list, spinlock_t *list_lock);
 303 static inline void rds_ib_destroy_nodev_conns(void)
 304 {
 305         __rds_ib_destroy_conns(&ib_nodev_conns, &ib_nodev_conns_lock);
 306 }
 307 static inline void rds_ib_destroy_conns(struct rds_ib_device *rds_ibdev)
 308 {
 309         __rds_ib_destroy_conns(&rds_ibdev->conn_list, &rds_ibdev->spinlock);
 310 }
 311 struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *);
 312 void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo);
 313 void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
 314 void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
 315                     struct rds_sock *rs, u32 *key_ret);
 316 void rds_ib_sync_mr(void *trans_private, int dir);
 317 void rds_ib_free_mr(void *trans_private, int invalidate);
 318 void rds_ib_flush_mrs(void);
 319
 320 /* ib_recv.c */
 321 int __init rds_ib_recv_init(void);
 322 void rds_ib_recv_exit(void);
 323 int rds_ib_recv(struct rds_connection *conn);
 324 int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic);
 325 void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
 326 int rds_ib_recv_refill(struct rds_connection *conn, int prefill);
 327 void rds_ib_inc_free(struct rds_incoming *inc);
 328 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov,
 329                              size_t size);
 330 void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context);
 331 void rds_ib_recv_tasklet_fn(unsigned long data);
 332 void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
 333 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
 334 void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
 335 void rds_ib_attempt_ack(struct rds_ib_connection *ic);
 336 void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
 337 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
 338
 339 /* ib_ring.c */
 340 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
 341 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
 342 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
 343 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
 344 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
 345 int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
 346 int rds_ib_ring_low(struct rds_ib_work_ring *ring);
 347 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
 348 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
 349 extern wait_queue_head_t rds_ib_ring_empty_wait;
 350
 351 /* ib_send.c */
 352 void rds_ib_xmit_complete(struct rds_connection *conn);
 353 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
 354                 unsigned int hdr_off, unsigned int sg, unsigned int off);
 355 void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context);
 356 void rds_ib_send_init_ring(struct rds_ib_connection *ic);
 357 void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
 358 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
 359 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
 360 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
 361 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
 362                              u32 *adv_credits, int need_posted, int max_posted);
 363 int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
 364
 365 /* ib_stats.c */
 366 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
 367 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
 368 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
 369                                     unsigned int avail);
 370
 371 /* ib_sysctl.c */
 372 int __init rds_ib_sysctl_init(void);
 373 void rds_ib_sysctl_exit(void);
 374 extern unsigned long rds_ib_sysctl_max_send_wr;
 375 extern unsigned long rds_ib_sysctl_max_recv_wr;
 376 extern unsigned long rds_ib_sysctl_max_unsig_wrs;
 377 extern unsigned long rds_ib_sysctl_max_unsig_bytes;
 378 extern unsigned long rds_ib_sysctl_max_recv_allocation;
 379 extern unsigned int rds_ib_sysctl_flow_control;
 380 extern ctl_table rds_ib_sysctl_table[];
 381
 382 #endif