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 struct rds_ib_connect_private {
  61         /* Add new fields at the end, and don't permute existing fields. */
  62         __be32                  dp_saddr;
  63         __be32                  dp_daddr;
  64         u8                      dp_protocol_major;
  65         u8                      dp_protocol_minor;
  66         __be16                  dp_protocol_minor_mask; /* bitmask */
  67         __be32                  dp_reserved1;
  68         __be64                  dp_ack_seq;
  69         __be32                  dp_credit;              /* non-zero enables flow ctl */
  70 };
  71
  72 struct rds_ib_send_work {
  73         void                    *s_op;
  74         union {
  75                 struct ib_send_wr       s_wr;
  76                 struct ib_rdma_wr       s_rdma_wr;
  77                 struct ib_atomic_wr     s_atomic_wr;
  78         };
  79         struct ib_sge           s_sge[RDS_IB_MAX_SGE];
  80         unsigned long           s_queued;
  81 };
  82
  83 struct rds_ib_recv_work {
  84         struct rds_ib_incoming  *r_ibinc;
  85         struct rds_page_frag    *r_frag;
  86         struct ib_recv_wr       r_wr;
  87         struct ib_sge           r_sge[2];
  88 };
  89
  90 struct rds_ib_work_ring {
  91         u32             w_nr;
  92         u32             w_alloc_ptr;
  93         u32             w_alloc_ctr;
  94         u32             w_free_ptr;
  95         atomic_t        w_free_ctr;
  96 };
  97
  98 /* Rings are posted with all the allocations they'll need to queue the
  99  * incoming message to the receiving socket so this can't fail.
 100  * All fragments start with a header, so we can make sure we're not receiving
 101  * garbage, and we can tell a small 8 byte fragment from an ACK frame.
 102  */
 103 struct rds_ib_ack_state {
 104         u64             ack_next;
 105         u64             ack_recv;
 106         unsigned int    ack_required:1;
 107         unsigned int    ack_next_valid:1;
 108         unsigned int    ack_recv_valid:1;
 109 };
 110
 111
 112 struct rds_ib_device;
 113
 114 struct rds_ib_connection {
 115
 116         struct list_head        ib_node;
 117         struct rds_ib_device    *rds_ibdev;
 118         struct rds_connection   *conn;
 119
 120         /* alphabet soup, IBTA style */
 121         struct rdma_cm_id       *i_cm_id;
 122         struct ib_pd            *i_pd;
 123         struct ib_cq            *i_send_cq;
 124         struct ib_cq            *i_recv_cq;
 125         struct ib_wc            i_send_wc[RDS_IB_WC_MAX];
 126         struct ib_wc            i_recv_wc[RDS_IB_WC_MAX];
 127
 128         /* To control the number of wrs from fastreg */
 129         atomic_t                i_fastreg_wrs;
 130         atomic_t                i_fastunreg_wrs;
 131
 132         /* interrupt handling */
 133         struct tasklet_struct   i_send_tasklet;
 134         struct tasklet_struct   i_recv_tasklet;
 135
 136         /* tx */
 137         struct rds_ib_work_ring i_send_ring;
 138         struct rm_data_op       *i_data_op;
 139         struct rds_header       *i_send_hdrs;
 140         dma_addr_t              i_send_hdrs_dma;
 141         struct rds_ib_send_work *i_sends;
 142         atomic_t                i_signaled_sends;
 143
 144         /* rx */
 145         struct mutex            i_recv_mutex;
 146         struct rds_ib_work_ring i_recv_ring;
 147         struct rds_ib_incoming  *i_ibinc;
 148         u32                     i_recv_data_rem;
 149         struct rds_header       *i_recv_hdrs;
 150         dma_addr_t              i_recv_hdrs_dma;
 151         struct rds_ib_recv_work *i_recvs;
 152         u64                     i_ack_recv;     /* last ACK received */
 153         struct rds_ib_refill_cache i_cache_incs;
 154         struct rds_ib_refill_cache i_cache_frags;
 155         atomic_t                i_cache_allocs;
 156
 157         /* sending acks */
 158         unsigned long           i_ack_flags;
 159 #ifdef KERNEL_HAS_ATOMIC64
 160         atomic64_t              i_ack_next;     /* next ACK to send */
 161 #else
 162         spinlock_t              i_ack_lock;     /* protect i_ack_next */
 163         u64                     i_ack_next;     /* next ACK to send */
 164 #endif
 165         struct rds_header       *i_ack;
 166         struct ib_send_wr       i_ack_wr;
 167         struct ib_sge           i_ack_sge;
 168         dma_addr_t              i_ack_dma;
 169         unsigned long           i_ack_queued;
 170
 171         /* Flow control related information
 172          *
 173          * Our algorithm uses a pair variables that we need to access
 174          * atomically - one for the send credits, and one posted
 175          * recv credits we need to transfer to remote.
 176          * Rather than protect them using a slow spinlock, we put both into
 177          * a single atomic_t and update it using cmpxchg
 178          */
 179         atomic_t                i_credits;
 180
 181         /* Protocol version specific information */
 182         unsigned int            i_flowctl:1;    /* enable/disable flow ctl */
 183
 184         /* Batched completions */
 185         unsigned int            i_unsignaled_wrs;
 186
 187         /* Endpoint role in connection */
 188         bool                    i_active_side;
 189         atomic_t                i_cq_quiesce;
 190
 191         /* Send/Recv vectors */
 192         int                     i_scq_vector;
 193         int                     i_rcq_vector;
 194 };
 195
 196 /* This assumes that atomic_t is at least 32 bits */
 197 #define IB_GET_SEND_CREDITS(v)  ((v) & 0xffff)
 198 #define IB_GET_POST_CREDITS(v)  ((v) >> 16)
 199 #define IB_SET_SEND_CREDITS(v)  ((v) & 0xffff)
 200 #define IB_SET_POST_CREDITS(v)  ((v) << 16)
 201
 202 struct rds_ib_ipaddr {
 203         struct list_head        list;
 204         __be32                  ipaddr;
 205         struct rcu_head         rcu;
 206 };
 207
 208 enum {
 209         RDS_IB_MR_8K_POOL,
 210         RDS_IB_MR_1M_POOL,
 211 };
 212
 213 struct rds_ib_device {
 214         struct list_head        list;
 215         struct list_head        ipaddr_list;
 216         struct list_head        conn_list;
 217         struct ib_device        *dev;
 218         struct ib_pd            *pd;
 219         bool                    has_fmr;
 220         bool                    has_fr;
 221         bool                    use_fastreg;
 222
 223         unsigned int            max_mrs;
 224         struct rds_ib_mr_pool   *mr_1m_pool;
 225         struct rds_ib_mr_pool   *mr_8k_pool;
 226         unsigned int            fmr_max_remaps;
 227         unsigned int            max_8k_mrs;
 228         unsigned int            max_1m_mrs;
 229         int                     max_sge;
 230         unsigned int            max_wrs;
 231         unsigned int            max_initiator_depth;
 232         unsigned int            max_responder_resources;
 233         spinlock_t              spinlock;       /* protect the above */
 234         refcount_t              refcount;
 235         struct work_struct      free_work;
 236         int                     *vector_load;
 237 };
 238
 239 #define ibdev_to_node(ibdev) dev_to_node((ibdev)->dev.parent)
 240 #define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)
 241
 242 /* bits for i_ack_flags */
 243 #define IB_ACK_IN_FLIGHT        0
 244 #define IB_ACK_REQUESTED        1
 245
 246 /* Magic WR_ID for ACKs */
 247 #define RDS_IB_ACK_WR_ID        (~(u64) 0)
 248
 249 struct rds_ib_statistics {
 250         uint64_t        s_ib_connect_raced;
 251         uint64_t        s_ib_listen_closed_stale;
 252         uint64_t        s_ib_evt_handler_call;
 253         uint64_t        s_ib_tasklet_call;
 254         uint64_t        s_ib_tx_cq_event;
 255         uint64_t        s_ib_tx_ring_full;
 256         uint64_t        s_ib_tx_throttle;
 257         uint64_t        s_ib_tx_sg_mapping_failure;
 258         uint64_t        s_ib_tx_stalled;
 259         uint64_t        s_ib_tx_credit_updates;
 260         uint64_t        s_ib_rx_cq_event;
 261         uint64_t        s_ib_rx_ring_empty;
 262         uint64_t        s_ib_rx_refill_from_cq;
 263         uint64_t        s_ib_rx_refill_from_thread;
 264         uint64_t        s_ib_rx_alloc_limit;
 265         uint64_t        s_ib_rx_total_frags;
 266         uint64_t        s_ib_rx_total_incs;
 267         uint64_t        s_ib_rx_credit_updates;
 268         uint64_t        s_ib_ack_sent;
 269         uint64_t        s_ib_ack_send_failure;
 270         uint64_t        s_ib_ack_send_delayed;
 271         uint64_t        s_ib_ack_send_piggybacked;
 272         uint64_t        s_ib_ack_received;
 273         uint64_t        s_ib_rdma_mr_8k_alloc;
 274         uint64_t        s_ib_rdma_mr_8k_free;
 275         uint64_t        s_ib_rdma_mr_8k_used;
 276         uint64_t        s_ib_rdma_mr_8k_pool_flush;
 277         uint64_t        s_ib_rdma_mr_8k_pool_wait;
 278         uint64_t        s_ib_rdma_mr_8k_pool_depleted;
 279         uint64_t        s_ib_rdma_mr_1m_alloc;
 280         uint64_t        s_ib_rdma_mr_1m_free;
 281         uint64_t        s_ib_rdma_mr_1m_used;
 282         uint64_t        s_ib_rdma_mr_1m_pool_flush;
 283         uint64_t        s_ib_rdma_mr_1m_pool_wait;
 284         uint64_t        s_ib_rdma_mr_1m_pool_depleted;
 285         uint64_t        s_ib_rdma_mr_8k_reused;
 286         uint64_t        s_ib_rdma_mr_1m_reused;
 287         uint64_t        s_ib_atomic_cswp;
 288         uint64_t        s_ib_atomic_fadd;
 289         uint64_t        s_ib_recv_added_to_cache;
 290         uint64_t        s_ib_recv_removed_from_cache;
 291 };
 292
 293 extern struct workqueue_struct *rds_ib_wq;
 294
 295 /*
 296  * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
 297  * doesn't define it.
 298  */
 299 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
 300                                               struct scatterlist *sglist,
 301                                               unsigned int sg_dma_len,
 302                                               int direction)
 303 {
 304         struct scatterlist *sg;
 305         unsigned int i;
 306
 307         for_each_sg(sglist, sg, sg_dma_len, i) {
 308                 ib_dma_sync_single_for_cpu(dev,
 309                                 ib_sg_dma_address(dev, sg),
 310                                 ib_sg_dma_len(dev, sg),
 311                                 direction);
 312         }
 313 }
 314 #define ib_dma_sync_sg_for_cpu  rds_ib_dma_sync_sg_for_cpu
 315
 316 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
 317                                                  struct scatterlist *sglist,
 318                                                  unsigned int sg_dma_len,
 319                                                  int direction)
 320 {
 321         struct scatterlist *sg;
 322         unsigned int i;
 323
 324         for_each_sg(sglist, sg, sg_dma_len, i) {
 325                 ib_dma_sync_single_for_device(dev,
 326                                 ib_sg_dma_address(dev, sg),
 327                                 ib_sg_dma_len(dev, sg),
 328                                 direction);
 329         }
 330 }
 331 #define ib_dma_sync_sg_for_device       rds_ib_dma_sync_sg_for_device
 332
 333
 334 /* ib.c */
 335 extern struct rds_transport rds_ib_transport;
 336 struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device);
 337 void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
 338 extern struct ib_client rds_ib_client;
 339
 340 extern unsigned int rds_ib_retry_count;
 341
 342 extern spinlock_t ib_nodev_conns_lock;
 343 extern struct list_head ib_nodev_conns;
 344
 345 /* ib_cm.c */
 346 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
 347 void rds_ib_conn_free(void *arg);
 348 int rds_ib_conn_path_connect(struct rds_conn_path *cp);
 349 void rds_ib_conn_path_shutdown(struct rds_conn_path *cp);
 350 void rds_ib_state_change(struct sock *sk);
 351 int rds_ib_listen_init(void);
 352 void rds_ib_listen_stop(void);
 353 __printf(2, 3)
 354 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
 355 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
 356                              struct rdma_cm_event *event);
 357 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
 358 void rds_ib_cm_connect_complete(struct rds_connection *conn,
 359                                 struct rdma_cm_event *event);
 360
 361
 362 #define rds_ib_conn_error(conn, fmt...) \
 363         __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
 364
 365 /* ib_rdma.c */
 366 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
 367 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 368 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 369 void rds_ib_destroy_nodev_conns(void);
 370 void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
 371
 372 /* ib_recv.c */
 373 int rds_ib_recv_init(void);
 374 void rds_ib_recv_exit(void);
 375 int rds_ib_recv_path(struct rds_conn_path *conn);
 376 int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic, gfp_t gfp);
 377 void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
 378 void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp);
 379 void rds_ib_inc_free(struct rds_incoming *inc);
 380 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
 381 void rds_ib_recv_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc,
 382                              struct rds_ib_ack_state *state);
 383 void rds_ib_recv_tasklet_fn(unsigned long data);
 384 void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
 385 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
 386 void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
 387 void rds_ib_attempt_ack(struct rds_ib_connection *ic);
 388 void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
 389 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
 390 void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required);
 391
 392 /* ib_ring.c */
 393 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
 394 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
 395 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
 396 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
 397 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
 398 int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
 399 int rds_ib_ring_low(struct rds_ib_work_ring *ring);
 400 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
 401 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
 402 extern wait_queue_head_t rds_ib_ring_empty_wait;
 403
 404 /* ib_send.c */
 405 void rds_ib_xmit_path_complete(struct rds_conn_path *cp);
 406 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
 407                 unsigned int hdr_off, unsigned int sg, unsigned int off);
 408 void rds_ib_send_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
 409 void rds_ib_send_init_ring(struct rds_ib_connection *ic);
 410 void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
 411 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
 412 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
 413 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
 414 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
 415                              u32 *adv_credits, int need_posted, int max_posted);
 416 int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
 417
 418 /* ib_stats.c */
 419 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
 420 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
 421 #define rds_ib_stats_add(member, count) \
 422                 rds_stats_add_which(rds_ib_stats, member, count)
 423 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
 424                                     unsigned int avail);
 425
 426 /* ib_sysctl.c */
 427 int rds_ib_sysctl_init(void);
 428 void rds_ib_sysctl_exit(void);
 429 extern unsigned long rds_ib_sysctl_max_send_wr;
 430 extern unsigned long rds_ib_sysctl_max_recv_wr;
 431 extern unsigned long rds_ib_sysctl_max_unsig_wrs;
 432 extern unsigned long rds_ib_sysctl_max_unsig_bytes;
 433 extern unsigned long rds_ib_sysctl_max_recv_allocation;
 434 extern unsigned int rds_ib_sysctl_flow_control;
 435
 436 #endif