kernel/net/rds/iw.h

   1 #ifndef _RDS_IW_H
   2 #define _RDS_IW_H
   3
   4 #include <linux/interrupt.h>
   5 #include <rdma/ib_verbs.h>
   6 #include <rdma/rdma_cm.h>
   7 #include "rds.h"
   8 #include "rdma_transport.h"
   9
  10 #define RDS_FASTREG_SIZE                20
  11 #define RDS_FASTREG_POOL_SIZE           2048
  12
  13 #define RDS_IW_MAX_SGE                  8
  14 #define RDS_IW_RECV_SGE                 2
  15
  16 #define RDS_IW_DEFAULT_RECV_WR          1024
  17 #define RDS_IW_DEFAULT_SEND_WR          256
  18
  19 #define RDS_IW_SUPPORTED_PROTOCOLS      0x00000003      /* minor versions supported */
  20
  21 extern struct list_head rds_iw_devices;
  22
  23 /*
  24  * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
  25  * try and minimize the amount of memory tied up both the device and
  26  * socket receive queues.
  27  */
  28 /* page offset of the final full frag that fits in the page */
  29 #define RDS_PAGE_LAST_OFF (((PAGE_SIZE  / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE)
  30 struct rds_page_frag {
  31         struct list_head        f_item;
  32         struct page             *f_page;
  33         unsigned long           f_offset;
  34         dma_addr_t              f_mapped;
  35 };
  36
  37 struct rds_iw_incoming {
  38         struct list_head        ii_frags;
  39         struct rds_incoming     ii_inc;
  40 };
  41
  42 struct rds_iw_connect_private {
  43         /* Add new fields at the end, and don't permute existing fields. */
  44         __be32                  dp_saddr;
  45         __be32                  dp_daddr;
  46         u8                      dp_protocol_major;
  47         u8                      dp_protocol_minor;
  48         __be16                  dp_protocol_minor_mask; /* bitmask */
  49         __be32                  dp_reserved1;
  50         __be64                  dp_ack_seq;
  51         __be32                  dp_credit;              /* non-zero enables flow ctl */
  52 };
  53
  54 struct rds_iw_scatterlist {
  55         struct scatterlist      *list;
  56         unsigned int            len;
  57         int                     dma_len;
  58         unsigned int            dma_npages;
  59         unsigned int            bytes;
  60 };
  61
  62 struct rds_iw_mapping {
  63         spinlock_t              m_lock; /* protect the mapping struct */
  64         struct list_head        m_list;
  65         struct rds_iw_mr        *m_mr;
  66         uint32_t                m_rkey;
  67         struct rds_iw_scatterlist m_sg;
  68 };
  69
  70 struct rds_iw_send_work {
  71         struct rds_message      *s_rm;
  72
  73         /* We should really put these into a union: */
  74         struct rm_rdma_op       *s_op;
  75         struct rds_iw_mapping   *s_mapping;
  76         struct ib_mr            *s_mr;
  77         unsigned char           s_remap_count;
  78
  79         union {
  80                 struct ib_send_wr       s_send_wr;
  81                 struct ib_rdma_wr       s_rdma_wr;
  82                 struct ib_reg_wr        s_reg_wr;
  83         };
  84         struct ib_sge           s_sge[RDS_IW_MAX_SGE];
  85         unsigned long           s_queued;
  86 };
  87
  88 struct rds_iw_recv_work {
  89         struct rds_iw_incoming  *r_iwinc;
  90         struct rds_page_frag    *r_frag;
  91         struct ib_recv_wr       r_wr;
  92         struct ib_sge           r_sge[2];
  93 };
  94
  95 struct rds_iw_work_ring {
  96         u32             w_nr;
  97         u32             w_alloc_ptr;
  98         u32             w_alloc_ctr;
  99         u32             w_free_ptr;
 100         atomic_t        w_free_ctr;
 101 };
 102
 103 struct rds_iw_device;
 104
 105 struct rds_iw_connection {
 106
 107         struct list_head        iw_node;
 108         struct rds_iw_device    *rds_iwdev;
 109         struct rds_connection   *conn;
 110
 111         /* alphabet soup, IBTA style */
 112         struct rdma_cm_id       *i_cm_id;
 113         struct ib_pd            *i_pd;
 114         struct ib_mr            *i_mr;
 115         struct ib_cq            *i_send_cq;
 116         struct ib_cq            *i_recv_cq;
 117
 118         /* tx */
 119         struct rds_iw_work_ring i_send_ring;
 120         struct rds_message      *i_rm;
 121         struct rds_header       *i_send_hdrs;
 122         u64                     i_send_hdrs_dma;
 123         struct rds_iw_send_work *i_sends;
 124
 125         /* rx */
 126         struct tasklet_struct   i_recv_tasklet;
 127         struct mutex            i_recv_mutex;
 128         struct rds_iw_work_ring i_recv_ring;
 129         struct rds_iw_incoming  *i_iwinc;
 130         u32                     i_recv_data_rem;
 131         struct rds_header       *i_recv_hdrs;
 132         u64                     i_recv_hdrs_dma;
 133         struct rds_iw_recv_work *i_recvs;
 134         struct rds_page_frag    i_frag;
 135         u64                     i_ack_recv;     /* last ACK received */
 136
 137         /* sending acks */
 138         unsigned long           i_ack_flags;
 139 #ifdef KERNEL_HAS_ATOMIC64
 140         atomic64_t              i_ack_next;     /* next ACK to send */
 141 #else
 142         spinlock_t              i_ack_lock;     /* protect i_ack_next */
 143         u64                     i_ack_next;     /* next ACK to send */
 144 #endif
 145         struct rds_header       *i_ack;
 146         struct ib_send_wr       i_ack_wr;
 147         struct ib_sge           i_ack_sge;
 148         u64                     i_ack_dma;
 149         unsigned long           i_ack_queued;
 150
 151         /* Flow control related information
 152          *
 153          * Our algorithm uses a pair variables that we need to access
 154          * atomically - one for the send credits, and one posted
 155          * recv credits we need to transfer to remote.
 156          * Rather than protect them using a slow spinlock, we put both into
 157          * a single atomic_t and update it using cmpxchg
 158          */
 159         atomic_t                i_credits;
 160
 161         /* Protocol version specific information */
 162         unsigned int            i_flowctl:1;    /* enable/disable flow ctl */
 163         unsigned int            i_dma_local_lkey:1;
 164         unsigned int            i_fastreg_posted:1; /* fastreg posted on this connection */
 165         /* Batched completions */
 166         unsigned int            i_unsignaled_wrs;
 167         long                    i_unsignaled_bytes;
 168 };
 169
 170 /* This assumes that atomic_t is at least 32 bits */
 171 #define IB_GET_SEND_CREDITS(v)  ((v) & 0xffff)
 172 #define IB_GET_POST_CREDITS(v)  ((v) >> 16)
 173 #define IB_SET_SEND_CREDITS(v)  ((v) & 0xffff)
 174 #define IB_SET_POST_CREDITS(v)  ((v) << 16)
 175
 176 struct rds_iw_cm_id {
 177         struct list_head        list;
 178         struct rdma_cm_id       *cm_id;
 179 };
 180
 181 struct rds_iw_device {
 182         struct list_head        list;
 183         struct list_head        cm_id_list;
 184         struct list_head        conn_list;
 185         struct ib_device        *dev;
 186         struct ib_pd            *pd;
 187         struct ib_mr            *mr;
 188         struct rds_iw_mr_pool   *mr_pool;
 189         int                     max_sge;
 190         unsigned int            max_wrs;
 191         unsigned int            dma_local_lkey:1;
 192         spinlock_t              spinlock;       /* protect the above */
 193 };
 194
 195 /* bits for i_ack_flags */
 196 #define IB_ACK_IN_FLIGHT        0
 197 #define IB_ACK_REQUESTED        1
 198
 199 /* Magic WR_ID for ACKs */
 200 #define RDS_IW_ACK_WR_ID        ((u64)0xffffffffffffffffULL)
 201 #define RDS_IW_REG_WR_ID        ((u64)0xefefefefefefefefULL)
 202 #define RDS_IW_LOCAL_INV_WR_ID  ((u64)0xdfdfdfdfdfdfdfdfULL)
 203
 204 struct rds_iw_statistics {
 205         uint64_t        s_iw_connect_raced;
 206         uint64_t        s_iw_listen_closed_stale;
 207         uint64_t        s_iw_tx_cq_call;
 208         uint64_t        s_iw_tx_cq_event;
 209         uint64_t        s_iw_tx_ring_full;
 210         uint64_t        s_iw_tx_throttle;
 211         uint64_t        s_iw_tx_sg_mapping_failure;
 212         uint64_t        s_iw_tx_stalled;
 213         uint64_t        s_iw_tx_credit_updates;
 214         uint64_t        s_iw_rx_cq_call;
 215         uint64_t        s_iw_rx_cq_event;
 216         uint64_t        s_iw_rx_ring_empty;
 217         uint64_t        s_iw_rx_refill_from_cq;
 218         uint64_t        s_iw_rx_refill_from_thread;
 219         uint64_t        s_iw_rx_alloc_limit;
 220         uint64_t        s_iw_rx_credit_updates;
 221         uint64_t        s_iw_ack_sent;
 222         uint64_t        s_iw_ack_send_failure;
 223         uint64_t        s_iw_ack_send_delayed;
 224         uint64_t        s_iw_ack_send_piggybacked;
 225         uint64_t        s_iw_ack_received;
 226         uint64_t        s_iw_rdma_mr_alloc;
 227         uint64_t        s_iw_rdma_mr_free;
 228         uint64_t        s_iw_rdma_mr_used;
 229         uint64_t        s_iw_rdma_mr_pool_flush;
 230         uint64_t        s_iw_rdma_mr_pool_wait;
 231         uint64_t        s_iw_rdma_mr_pool_depleted;
 232 };
 233
 234 extern struct workqueue_struct *rds_iw_wq;
 235
 236 /*
 237  * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
 238  * doesn't define it.
 239  */
 240 static inline void rds_iw_dma_sync_sg_for_cpu(struct ib_device *dev,
 241                 struct scatterlist *sg, unsigned int sg_dma_len, int direction)
 242 {
 243         unsigned int i;
 244
 245         for (i = 0; i < sg_dma_len; ++i) {
 246                 ib_dma_sync_single_for_cpu(dev,
 247                                 ib_sg_dma_address(dev, &sg[i]),
 248                                 ib_sg_dma_len(dev, &sg[i]),
 249                                 direction);
 250         }
 251 }
 252 #define ib_dma_sync_sg_for_cpu  rds_iw_dma_sync_sg_for_cpu
 253
 254 static inline void rds_iw_dma_sync_sg_for_device(struct ib_device *dev,
 255                 struct scatterlist *sg, unsigned int sg_dma_len, int direction)
 256 {
 257         unsigned int i;
 258
 259         for (i = 0; i < sg_dma_len; ++i) {
 260                 ib_dma_sync_single_for_device(dev,
 261                                 ib_sg_dma_address(dev, &sg[i]),
 262                                 ib_sg_dma_len(dev, &sg[i]),
 263                                 direction);
 264         }
 265 }
 266 #define ib_dma_sync_sg_for_device       rds_iw_dma_sync_sg_for_device
 267
 268 static inline u32 rds_iw_local_dma_lkey(struct rds_iw_connection *ic)
 269 {
 270         return ic->i_dma_local_lkey ? ic->i_cm_id->device->local_dma_lkey : ic->i_mr->lkey;
 271 }
 272
 273 /* ib.c */
 274 extern struct rds_transport rds_iw_transport;
 275 extern struct ib_client rds_iw_client;
 276
 277 extern unsigned int fastreg_pool_size;
 278 extern unsigned int fastreg_message_size;
 279
 280 extern spinlock_t iw_nodev_conns_lock;
 281 extern struct list_head iw_nodev_conns;
 282
 283 /* ib_cm.c */
 284 int rds_iw_conn_alloc(struct rds_connection *conn, gfp_t gfp);
 285 void rds_iw_conn_free(void *arg);
 286 int rds_iw_conn_connect(struct rds_connection *conn);
 287 void rds_iw_conn_shutdown(struct rds_connection *conn);
 288 void rds_iw_state_change(struct sock *sk);
 289 int rds_iw_listen_init(void);
 290 void rds_iw_listen_stop(void);
 291 void __rds_iw_conn_error(struct rds_connection *conn, const char *, ...);
 292 int rds_iw_cm_handle_connect(struct rdma_cm_id *cm_id,
 293                              struct rdma_cm_event *event);
 294 int rds_iw_cm_initiate_connect(struct rdma_cm_id *cm_id);
 295 void rds_iw_cm_connect_complete(struct rds_connection *conn,
 296                                 struct rdma_cm_event *event);
 297
 298
 299 #define rds_iw_conn_error(conn, fmt...) \
 300         __rds_iw_conn_error(conn, KERN_WARNING "RDS/IW: " fmt)
 301
 302 /* ib_rdma.c */
 303 int rds_iw_update_cm_id(struct rds_iw_device *rds_iwdev, struct rdma_cm_id *cm_id);
 304 void rds_iw_add_conn(struct rds_iw_device *rds_iwdev, struct rds_connection *conn);
 305 void rds_iw_remove_conn(struct rds_iw_device *rds_iwdev, struct rds_connection *conn);
 306 void __rds_iw_destroy_conns(struct list_head *list, spinlock_t *list_lock);
 307 static inline void rds_iw_destroy_nodev_conns(void)
 308 {
 309         __rds_iw_destroy_conns(&iw_nodev_conns, &iw_nodev_conns_lock);
 310 }
 311 static inline void rds_iw_destroy_conns(struct rds_iw_device *rds_iwdev)
 312 {
 313         __rds_iw_destroy_conns(&rds_iwdev->conn_list, &rds_iwdev->spinlock);
 314 }
 315 struct rds_iw_mr_pool *rds_iw_create_mr_pool(struct rds_iw_device *);
 316 void rds_iw_get_mr_info(struct rds_iw_device *rds_iwdev, struct rds_info_rdma_connection *iinfo);
 317 void rds_iw_destroy_mr_pool(struct rds_iw_mr_pool *);
 318 void *rds_iw_get_mr(struct scatterlist *sg, unsigned long nents,
 319                     struct rds_sock *rs, u32 *key_ret);
 320 void rds_iw_sync_mr(void *trans_private, int dir);
 321 void rds_iw_free_mr(void *trans_private, int invalidate);
 322 void rds_iw_flush_mrs(void);
 323
 324 /* ib_recv.c */
 325 int rds_iw_recv_init(void);
 326 void rds_iw_recv_exit(void);
 327 int rds_iw_recv(struct rds_connection *conn);
 328 int rds_iw_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp,
 329                        gfp_t page_gfp, int prefill);
 330 void rds_iw_inc_free(struct rds_incoming *inc);
 331 int rds_iw_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
 332 void rds_iw_recv_cq_comp_handler(struct ib_cq *cq, void *context);
 333 void rds_iw_recv_tasklet_fn(unsigned long data);
 334 void rds_iw_recv_init_ring(struct rds_iw_connection *ic);
 335 void rds_iw_recv_clear_ring(struct rds_iw_connection *ic);
 336 void rds_iw_recv_init_ack(struct rds_iw_connection *ic);
 337 void rds_iw_attempt_ack(struct rds_iw_connection *ic);
 338 void rds_iw_ack_send_complete(struct rds_iw_connection *ic);
 339 u64 rds_iw_piggyb_ack(struct rds_iw_connection *ic);
 340
 341 /* ib_ring.c */
 342 void rds_iw_ring_init(struct rds_iw_work_ring *ring, u32 nr);
 343 void rds_iw_ring_resize(struct rds_iw_work_ring *ring, u32 nr);
 344 u32 rds_iw_ring_alloc(struct rds_iw_work_ring *ring, u32 val, u32 *pos);
 345 void rds_iw_ring_free(struct rds_iw_work_ring *ring, u32 val);
 346 void rds_iw_ring_unalloc(struct rds_iw_work_ring *ring, u32 val);
 347 int rds_iw_ring_empty(struct rds_iw_work_ring *ring);
 348 int rds_iw_ring_low(struct rds_iw_work_ring *ring);
 349 u32 rds_iw_ring_oldest(struct rds_iw_work_ring *ring);
 350 u32 rds_iw_ring_completed(struct rds_iw_work_ring *ring, u32 wr_id, u32 oldest);
 351 extern wait_queue_head_t rds_iw_ring_empty_wait;
 352
 353 /* ib_send.c */
 354 void rds_iw_xmit_complete(struct rds_connection *conn);
 355 int rds_iw_xmit(struct rds_connection *conn, struct rds_message *rm,
 356                 unsigned int hdr_off, unsigned int sg, unsigned int off);
 357 void rds_iw_send_cq_comp_handler(struct ib_cq *cq, void *context);
 358 void rds_iw_send_init_ring(struct rds_iw_connection *ic);
 359 void rds_iw_send_clear_ring(struct rds_iw_connection *ic);
 360 int rds_iw_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
 361 void rds_iw_send_add_credits(struct rds_connection *conn, unsigned int credits);
 362 void rds_iw_advertise_credits(struct rds_connection *conn, unsigned int posted);
 363 int rds_iw_send_grab_credits(struct rds_iw_connection *ic, u32 wanted,
 364                              u32 *adv_credits, int need_posted, int max_posted);
 365
 366 /* ib_stats.c */
 367 DECLARE_PER_CPU(struct rds_iw_statistics, rds_iw_stats);
 368 #define rds_iw_stats_inc(member) rds_stats_inc_which(rds_iw_stats, member)
 369 unsigned int rds_iw_stats_info_copy(struct rds_info_iterator *iter,
 370                                     unsigned int avail);
 371
 372 /* ib_sysctl.c */
 373 int rds_iw_sysctl_init(void);
 374 void rds_iw_sysctl_exit(void);
 375 extern unsigned long rds_iw_sysctl_max_send_wr;
 376 extern unsigned long rds_iw_sysctl_max_recv_wr;
 377 extern unsigned long rds_iw_sysctl_max_unsig_wrs;
 378 extern unsigned long rds_iw_sysctl_max_unsig_bytes;
 379 extern unsigned long rds_iw_sysctl_max_recv_allocation;
 380 extern unsigned int rds_iw_sysctl_flow_control;
 381
 382 /*
 383  * Helper functions for getting/setting the header and data SGEs in
 384  * RDS packets (not RDMA)
 385  */
 386 static inline struct ib_sge *
 387 rds_iw_header_sge(struct rds_iw_connection *ic, struct ib_sge *sge)
 388 {
 389         return &sge[0];
 390 }
 391
 392 static inline struct ib_sge *
 393 rds_iw_data_sge(struct rds_iw_connection *ic, struct ib_sge *sge)
 394 {
 395         return &sge[1];
 396 }
 397
 398 #endif