net/rds/ib.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _RDS_IB_H
   3 #define _RDS_IB_H
   4
   5 #include <rdma/ib_verbs.h>
   6 #include <rdma/rdma_cm.h>
   7 #include <linux/interrupt.h>
   8 #include <linux/pci.h>
   9 #include <linux/slab.h>
  10 #include "rds.h"
  11 #include "rdma_transport.h"
  12
  13 #define RDS_IB_MAX_SGE                  8
  14 #define RDS_IB_RECV_SGE                 2
  15
  16 #define RDS_IB_DEFAULT_RECV_WR          1024
  17 #define RDS_IB_DEFAULT_SEND_WR          256
  18 #define RDS_IB_DEFAULT_FR_WR            256
  19 #define RDS_IB_DEFAULT_FR_INV_WR        256
  20
  21 #define RDS_IB_DEFAULT_RETRY_COUNT      1
  22
  23 #define RDS_IB_SUPPORTED_PROTOCOLS      0x00000003      /* minor versions supported */
  24
  25 #define RDS_IB_RECYCLE_BATCH_COUNT      32
  26
  27 #define RDS_IB_WC_MAX                   32
  28
  29 extern struct rw_semaphore rds_ib_devices_lock;
  30 extern struct list_head rds_ib_devices;
  31
  32 /*
  33  * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
  34  * try and minimize the amount of memory tied up both the device and
  35  * socket receive queues.
  36  */
  37 struct rds_page_frag {
  38         struct list_head        f_item;
  39         struct list_head        f_cache_entry;
  40         struct scatterlist      f_sg;
  41 };
  42
  43 struct rds_ib_incoming {
  44         struct list_head        ii_frags;
  45         struct list_head        ii_cache_entry;
  46         struct rds_incoming     ii_inc;
  47 };
  48
  49 struct rds_ib_cache_head {
  50         struct list_head *first;
  51         unsigned long count;
  52 };
  53
  54 struct rds_ib_refill_cache {
  55         struct rds_ib_cache_head __percpu *percpu;
  56         struct list_head         *xfer;
  57         struct list_head         *ready;
  58 };
  59
  60 /* This is the common structure for the IB private data exchange in setting up
  61  * an RDS connection.  The exchange is different for IPv4 and IPv6 connections.
  62  * The reason is that the address size is different and the addresses
  63  * exchanged are in the beginning of the structure.  Hence it is not possible
  64  * for interoperability if same structure is used.
  65  */
  66 struct rds_ib_conn_priv_cmn {
  67         u8                      ricpc_protocol_major;
  68         u8                      ricpc_protocol_minor;
  69         __be16                  ricpc_protocol_minor_mask;      /* bitmask */
  70         __be32                  ricpc_reserved1;
  71         __be64                  ricpc_ack_seq;
  72         __be32                  ricpc_credit;   /* non-zero enables flow ctl */
  73 };
  74
  75 struct rds_ib_connect_private {
  76         /* Add new fields at the end, and don't permute existing fields. */
  77         __be32                          dp_saddr;
  78         __be32                          dp_daddr;
  79         struct rds_ib_conn_priv_cmn     dp_cmn;
  80 };
  81
  82 struct rds6_ib_connect_private {
  83         /* Add new fields at the end, and don't permute existing fields. */
  84         struct in6_addr                 dp_saddr;
  85         struct in6_addr                 dp_daddr;
  86         struct rds_ib_conn_priv_cmn     dp_cmn;
  87 };
  88
  89 #define dp_protocol_major       dp_cmn.ricpc_protocol_major
  90 #define dp_protocol_minor       dp_cmn.ricpc_protocol_minor
  91 #define dp_protocol_minor_mask  dp_cmn.ricpc_protocol_minor_mask
  92 #define dp_ack_seq              dp_cmn.ricpc_ack_seq
  93 #define dp_credit               dp_cmn.ricpc_credit
  94
  95 union rds_ib_conn_priv {
  96         struct rds_ib_connect_private   ricp_v4;
  97         struct rds6_ib_connect_private  ricp_v6;
  98 };
  99
 100 struct rds_ib_send_work {
 101         void                    *s_op;
 102         union {
 103                 struct ib_send_wr       s_wr;
 104                 struct ib_rdma_wr       s_rdma_wr;
 105                 struct ib_atomic_wr     s_atomic_wr;
 106         };
 107         struct ib_sge           s_sge[RDS_IB_MAX_SGE];
 108         unsigned long           s_queued;
 109 };
 110
 111 struct rds_ib_recv_work {
 112         struct rds_ib_incoming  *r_ibinc;
 113         struct rds_page_frag    *r_frag;
 114         struct ib_recv_wr       r_wr;
 115         struct ib_sge           r_sge[2];
 116 };
 117
 118 struct rds_ib_work_ring {
 119         u32             w_nr;
 120         u32             w_alloc_ptr;
 121         u32             w_alloc_ctr;
 122         u32             w_free_ptr;
 123         atomic_t        w_free_ctr;
 124 };
 125
 126 /* Rings are posted with all the allocations they'll need to queue the
 127  * incoming message to the receiving socket so this can't fail.
 128  * All fragments start with a header, so we can make sure we're not receiving
 129  * garbage, and we can tell a small 8 byte fragment from an ACK frame.
 130  */
 131 struct rds_ib_ack_state {
 132         u64             ack_next;
 133         u64             ack_recv;
 134         unsigned int    ack_required:1;
 135         unsigned int    ack_next_valid:1;
 136         unsigned int    ack_recv_valid:1;
 137 };
 138
 139
 140 struct rds_ib_device;
 141
 142 struct rds_ib_connection {
 143
 144         struct list_head        ib_node;
 145         struct rds_ib_device    *rds_ibdev;
 146         struct rds_connection   *conn;
 147
 148         /* alphabet soup, IBTA style */
 149         struct rdma_cm_id       *i_cm_id;
 150         struct ib_pd            *i_pd;
 151         struct ib_cq            *i_send_cq;
 152         struct ib_cq            *i_recv_cq;
 153         struct ib_wc            i_send_wc[RDS_IB_WC_MAX];
 154         struct ib_wc            i_recv_wc[RDS_IB_WC_MAX];
 155
 156         /* To control the number of wrs from fastreg */
 157         atomic_t                i_fastreg_wrs;
 158         atomic_t                i_fastunreg_wrs;
 159
 160         /* interrupt handling */
 161         struct tasklet_struct   i_send_tasklet;
 162         struct tasklet_struct   i_recv_tasklet;
 163
 164         /* tx */
 165         struct rds_ib_work_ring i_send_ring;
 166         struct rm_data_op       *i_data_op;
 167         struct rds_header       *i_send_hdrs;
 168         dma_addr_t              i_send_hdrs_dma;
 169         struct rds_ib_send_work *i_sends;
 170         atomic_t                i_signaled_sends;
 171
 172         /* rx */
 173         struct mutex            i_recv_mutex;
 174         struct rds_ib_work_ring i_recv_ring;
 175         struct rds_ib_incoming  *i_ibinc;
 176         u32                     i_recv_data_rem;
 177         struct rds_header       *i_recv_hdrs;
 178         dma_addr_t              i_recv_hdrs_dma;
 179         struct rds_ib_recv_work *i_recvs;
 180         u64                     i_ack_recv;     /* last ACK received */
 181         struct rds_ib_refill_cache i_cache_incs;
 182         struct rds_ib_refill_cache i_cache_frags;
 183         atomic_t                i_cache_allocs;
 184
 185         /* sending acks */
 186         unsigned long           i_ack_flags;
 187 #ifdef KERNEL_HAS_ATOMIC64
 188         atomic64_t              i_ack_next;     /* next ACK to send */
 189 #else
 190         spinlock_t              i_ack_lock;     /* protect i_ack_next */
 191         u64                     i_ack_next;     /* next ACK to send */
 192 #endif
 193         struct rds_header       *i_ack;
 194         struct ib_send_wr       i_ack_wr;
 195         struct ib_sge           i_ack_sge;
 196         dma_addr_t              i_ack_dma;
 197         unsigned long           i_ack_queued;
 198
 199         /* Flow control related information
 200          *
 201          * Our algorithm uses a pair variables that we need to access
 202          * atomically - one for the send credits, and one posted
 203          * recv credits we need to transfer to remote.
 204          * Rather than protect them using a slow spinlock, we put both into
 205          * a single atomic_t and update it using cmpxchg
 206          */
 207         atomic_t                i_credits;
 208
 209         /* Protocol version specific information */
 210         unsigned int            i_flowctl:1;    /* enable/disable flow ctl */
 211
 212         /* Batched completions */
 213         unsigned int            i_unsignaled_wrs;
 214
 215         /* Endpoint role in connection */
 216         bool                    i_active_side;
 217         atomic_t                i_cq_quiesce;
 218
 219         /* Send/Recv vectors */
 220         int                     i_scq_vector;
 221         int                     i_rcq_vector;
 222 };
 223
 224 /* This assumes that atomic_t is at least 32 bits */
 225 #define IB_GET_SEND_CREDITS(v)  ((v) & 0xffff)
 226 #define IB_GET_POST_CREDITS(v)  ((v) >> 16)
 227 #define IB_SET_SEND_CREDITS(v)  ((v) & 0xffff)
 228 #define IB_SET_POST_CREDITS(v)  ((v) << 16)
 229
 230 struct rds_ib_ipaddr {
 231         struct list_head        list;
 232         __be32                  ipaddr;
 233         struct rcu_head         rcu;
 234 };
 235
 236 enum {
 237         RDS_IB_MR_8K_POOL,
 238         RDS_IB_MR_1M_POOL,
 239 };
 240
 241 struct rds_ib_device {
 242         struct list_head        list;
 243         struct list_head        ipaddr_list;
 244         struct list_head        conn_list;
 245         struct ib_device        *dev;
 246         struct ib_pd            *pd;
 247         bool                    use_fastreg;
 248
 249         unsigned int            max_mrs;
 250         struct rds_ib_mr_pool   *mr_1m_pool;
 251         struct rds_ib_mr_pool   *mr_8k_pool;
 252         unsigned int            fmr_max_remaps;
 253         unsigned int            max_8k_mrs;
 254         unsigned int            max_1m_mrs;
 255         int                     max_sge;
 256         unsigned int            max_wrs;
 257         unsigned int            max_initiator_depth;
 258         unsigned int            max_responder_resources;
 259         spinlock_t              spinlock;       /* protect the above */
 260         refcount_t              refcount;
 261         struct work_struct      free_work;
 262         int                     *vector_load;
 263 };
 264
 265 #define ibdev_to_node(ibdev) dev_to_node((ibdev)->dev.parent)
 266 #define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)
 267
 268 /* bits for i_ack_flags */
 269 #define IB_ACK_IN_FLIGHT        0
 270 #define IB_ACK_REQUESTED        1
 271
 272 /* Magic WR_ID for ACKs */
 273 #define RDS_IB_ACK_WR_ID        (~(u64) 0)
 274
 275 struct rds_ib_statistics {
 276         uint64_t        s_ib_connect_raced;
 277         uint64_t        s_ib_listen_closed_stale;
 278         uint64_t        s_ib_evt_handler_call;
 279         uint64_t        s_ib_tasklet_call;
 280         uint64_t        s_ib_tx_cq_event;
 281         uint64_t        s_ib_tx_ring_full;
 282         uint64_t        s_ib_tx_throttle;
 283         uint64_t        s_ib_tx_sg_mapping_failure;
 284         uint64_t        s_ib_tx_stalled;
 285         uint64_t        s_ib_tx_credit_updates;
 286         uint64_t        s_ib_rx_cq_event;
 287         uint64_t        s_ib_rx_ring_empty;
 288         uint64_t        s_ib_rx_refill_from_cq;
 289         uint64_t        s_ib_rx_refill_from_thread;
 290         uint64_t        s_ib_rx_alloc_limit;
 291         uint64_t        s_ib_rx_total_frags;
 292         uint64_t        s_ib_rx_total_incs;
 293         uint64_t        s_ib_rx_credit_updates;
 294         uint64_t        s_ib_ack_sent;
 295         uint64_t        s_ib_ack_send_failure;
 296         uint64_t        s_ib_ack_send_delayed;
 297         uint64_t        s_ib_ack_send_piggybacked;
 298         uint64_t        s_ib_ack_received;
 299         uint64_t        s_ib_rdma_mr_8k_alloc;
 300         uint64_t        s_ib_rdma_mr_8k_free;
 301         uint64_t        s_ib_rdma_mr_8k_used;
 302         uint64_t        s_ib_rdma_mr_8k_pool_flush;
 303         uint64_t        s_ib_rdma_mr_8k_pool_wait;
 304         uint64_t        s_ib_rdma_mr_8k_pool_depleted;
 305         uint64_t        s_ib_rdma_mr_1m_alloc;
 306         uint64_t        s_ib_rdma_mr_1m_free;
 307         uint64_t        s_ib_rdma_mr_1m_used;
 308         uint64_t        s_ib_rdma_mr_1m_pool_flush;
 309         uint64_t        s_ib_rdma_mr_1m_pool_wait;
 310         uint64_t        s_ib_rdma_mr_1m_pool_depleted;
 311         uint64_t        s_ib_rdma_mr_8k_reused;
 312         uint64_t        s_ib_rdma_mr_1m_reused;
 313         uint64_t        s_ib_atomic_cswp;
 314         uint64_t        s_ib_atomic_fadd;
 315         uint64_t        s_ib_recv_added_to_cache;
 316         uint64_t        s_ib_recv_removed_from_cache;
 317 };
 318
 319 extern struct workqueue_struct *rds_ib_wq;
 320
 321 /*
 322  * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
 323  * doesn't define it.
 324  */
 325 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
 326                                               struct scatterlist *sglist,
 327                                               unsigned int sg_dma_len,
 328                                               int direction)
 329 {
 330         struct scatterlist *sg;
 331         unsigned int i;
 332
 333         for_each_sg(sglist, sg, sg_dma_len, i) {
 334                 ib_dma_sync_single_for_cpu(dev,
 335                                 ib_sg_dma_address(dev, sg),
 336                                 ib_sg_dma_len(dev, sg),
 337                                 direction);
 338         }
 339 }
 340 #define ib_dma_sync_sg_for_cpu  rds_ib_dma_sync_sg_for_cpu
 341
 342 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
 343                                                  struct scatterlist *sglist,
 344                                                  unsigned int sg_dma_len,
 345                                                  int direction)
 346 {
 347         struct scatterlist *sg;
 348         unsigned int i;
 349
 350         for_each_sg(sglist, sg, sg_dma_len, i) {
 351                 ib_dma_sync_single_for_device(dev,
 352                                 ib_sg_dma_address(dev, sg),
 353                                 ib_sg_dma_len(dev, sg),
 354                                 direction);
 355         }
 356 }
 357 #define ib_dma_sync_sg_for_device       rds_ib_dma_sync_sg_for_device
 358
 359
 360 /* ib.c */
 361 extern struct rds_transport rds_ib_transport;
 362 struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device);
 363 void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
 364 extern struct ib_client rds_ib_client;
 365
 366 extern unsigned int rds_ib_retry_count;
 367
 368 extern spinlock_t ib_nodev_conns_lock;
 369 extern struct list_head ib_nodev_conns;
 370
 371 /* ib_cm.c */
 372 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
 373 void rds_ib_conn_free(void *arg);
 374 int rds_ib_conn_path_connect(struct rds_conn_path *cp);
 375 void rds_ib_conn_path_shutdown(struct rds_conn_path *cp);
 376 void rds_ib_state_change(struct sock *sk);
 377 int rds_ib_listen_init(void);
 378 void rds_ib_listen_stop(void);
 379 __printf(2, 3)
 380 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
 381 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
 382                              struct rdma_cm_event *event, bool isv6);
 383 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id, bool isv6);
 384 void rds_ib_cm_connect_complete(struct rds_connection *conn,
 385                                 struct rdma_cm_event *event);
 386
 387
 388 #define rds_ib_conn_error(conn, fmt...) \
 389         __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
 390
 391 /* ib_rdma.c */
 392 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev,
 393                          struct in6_addr *ipaddr);
 394 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 395 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 396 void rds_ib_destroy_nodev_conns(void);
 397 void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
 398
 399 /* ib_recv.c */
 400 int rds_ib_recv_init(void);
 401 void rds_ib_recv_exit(void);
 402 int rds_ib_recv_path(struct rds_conn_path *conn);
 403 int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic, gfp_t gfp);
 404 void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
 405 void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp);
 406 void rds_ib_inc_free(struct rds_incoming *inc);
 407 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
 408 void rds_ib_recv_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc,
 409                              struct rds_ib_ack_state *state);
 410 void rds_ib_recv_tasklet_fn(unsigned long data);
 411 void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
 412 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
 413 void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
 414 void rds_ib_attempt_ack(struct rds_ib_connection *ic);
 415 void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
 416 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
 417 void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required);
 418
 419 /* ib_ring.c */
 420 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
 421 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
 422 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
 423 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
 424 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
 425 int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
 426 int rds_ib_ring_low(struct rds_ib_work_ring *ring);
 427 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
 428 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
 429 extern wait_queue_head_t rds_ib_ring_empty_wait;
 430
 431 /* ib_send.c */
 432 void rds_ib_xmit_path_complete(struct rds_conn_path *cp);
 433 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
 434                 unsigned int hdr_off, unsigned int sg, unsigned int off);
 435 void rds_ib_send_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
 436 void rds_ib_send_init_ring(struct rds_ib_connection *ic);
 437 void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
 438 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
 439 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
 440 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
 441 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
 442                              u32 *adv_credits, int need_posted, int max_posted);
 443 int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
 444
 445 /* ib_stats.c */
 446 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_ib_statistics, rds_ib_stats);
 447 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
 448 #define rds_ib_stats_add(member, count) \
 449                 rds_stats_add_which(rds_ib_stats, member, count)
 450 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
 451                                     unsigned int avail);
 452
 453 /* ib_sysctl.c */
 454 int rds_ib_sysctl_init(void);
 455 void rds_ib_sysctl_exit(void);
 456 extern unsigned long rds_ib_sysctl_max_send_wr;
 457 extern unsigned long rds_ib_sysctl_max_recv_wr;
 458 extern unsigned long rds_ib_sysctl_max_unsig_wrs;
 459 extern unsigned long rds_ib_sysctl_max_unsig_bytes;
 460 extern unsigned long rds_ib_sysctl_max_recv_allocation;
 461 extern unsigned int rds_ib_sysctl_flow_control;
 462
 463 #endif