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            512
  19
  20 #define RDS_IB_DEFAULT_RETRY_COUNT      1
  21
  22 #define RDS_IB_SUPPORTED_PROTOCOLS      0x00000003      /* minor versions supported */
  23
  24 #define RDS_IB_RECYCLE_BATCH_COUNT      32
  25
  26 #define RDS_IB_WC_MAX                   32
  27
  28 extern struct rw_semaphore rds_ib_devices_lock;
  29 extern struct list_head rds_ib_devices;
  30
  31 /*
  32  * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
  33  * try and minimize the amount of memory tied up both the device and
  34  * socket receive queues.
  35  */
  36 struct rds_page_frag {
  37         struct list_head        f_item;
  38         struct list_head        f_cache_entry;
  39         struct scatterlist      f_sg;
  40 };
  41
  42 struct rds_ib_incoming {
  43         struct list_head        ii_frags;
  44         struct list_head        ii_cache_entry;
  45         struct rds_incoming     ii_inc;
  46 };
  47
  48 struct rds_ib_cache_head {
  49         struct list_head *first;
  50         unsigned long count;
  51 };
  52
  53 struct rds_ib_refill_cache {
  54         struct rds_ib_cache_head __percpu *percpu;
  55         struct list_head         *xfer;
  56         struct list_head         *ready;
  57 };
  58
  59 /* This is the common structure for the IB private data exchange in setting up
  60  * an RDS connection.  The exchange is different for IPv4 and IPv6 connections.
  61  * The reason is that the address size is different and the addresses
  62  * exchanged are in the beginning of the structure.  Hence it is not possible
  63  * for interoperability if same structure is used.
  64  */
  65 struct rds_ib_conn_priv_cmn {
  66         u8                      ricpc_protocol_major;
  67         u8                      ricpc_protocol_minor;
  68         __be16                  ricpc_protocol_minor_mask;      /* bitmask */
  69         u8                      ricpc_dp_toss;
  70         u8                      ripc_reserved1;
  71         __be16                  ripc_reserved2;
  72         __be64                  ricpc_ack_seq;
  73         __be32                  ricpc_credit;   /* non-zero enables flow ctl */
  74 };
  75
  76 struct rds_ib_connect_private {
  77         /* Add new fields at the end, and don't permute existing fields. */
  78         __be32                          dp_saddr;
  79         __be32                          dp_daddr;
  80         struct rds_ib_conn_priv_cmn     dp_cmn;
  81 };
  82
  83 struct rds6_ib_connect_private {
  84         /* Add new fields at the end, and don't permute existing fields. */
  85         struct in6_addr                 dp_saddr;
  86         struct in6_addr                 dp_daddr;
  87         struct rds_ib_conn_priv_cmn     dp_cmn;
  88 };
  89
  90 #define dp_protocol_major       dp_cmn.ricpc_protocol_major
  91 #define dp_protocol_minor       dp_cmn.ricpc_protocol_minor
  92 #define dp_protocol_minor_mask  dp_cmn.ricpc_protocol_minor_mask
  93 #define dp_ack_seq              dp_cmn.ricpc_ack_seq
  94 #define dp_credit               dp_cmn.ricpc_credit
  95
  96 union rds_ib_conn_priv {
  97         struct rds_ib_connect_private   ricp_v4;
  98         struct rds6_ib_connect_private  ricp_v6;
  99 };
 100
 101 struct rds_ib_send_work {
 102         void                    *s_op;
 103         union {
 104                 struct ib_send_wr       s_wr;
 105                 struct ib_rdma_wr       s_rdma_wr;
 106                 struct ib_atomic_wr     s_atomic_wr;
 107         };
 108         struct ib_sge           s_sge[RDS_IB_MAX_SGE];
 109         unsigned long           s_queued;
 110 };
 111
 112 struct rds_ib_recv_work {
 113         struct rds_ib_incoming  *r_ibinc;
 114         struct rds_page_frag    *r_frag;
 115         struct ib_recv_wr       r_wr;
 116         struct ib_sge           r_sge[2];
 117 };
 118
 119 struct rds_ib_work_ring {
 120         u32             w_nr;
 121         u32             w_alloc_ptr;
 122         u32             w_alloc_ctr;
 123         u32             w_free_ptr;
 124         atomic_t        w_free_ctr;
 125 };
 126
 127 /* Rings are posted with all the allocations they'll need to queue the
 128  * incoming message to the receiving socket so this can't fail.
 129  * All fragments start with a header, so we can make sure we're not receiving
 130  * garbage, and we can tell a small 8 byte fragment from an ACK frame.
 131  */
 132 struct rds_ib_ack_state {
 133         u64             ack_next;
 134         u64             ack_recv;
 135         unsigned int    ack_required:1;
 136         unsigned int    ack_next_valid:1;
 137         unsigned int    ack_recv_valid:1;
 138 };
 139
 140
 141 struct rds_ib_device;
 142
 143 struct rds_ib_connection {
 144
 145         struct list_head        ib_node;
 146         struct rds_ib_device    *rds_ibdev;
 147         struct rds_connection   *conn;
 148
 149         /* alphabet soup, IBTA style */
 150         struct rdma_cm_id       *i_cm_id;
 151         struct ib_pd            *i_pd;
 152         struct ib_cq            *i_send_cq;
 153         struct ib_cq            *i_recv_cq;
 154         struct ib_wc            i_send_wc[RDS_IB_WC_MAX];
 155         struct ib_wc            i_recv_wc[RDS_IB_WC_MAX];
 156
 157         /* To control the number of wrs from fastreg */
 158         atomic_t                i_fastreg_wrs;
 159         atomic_t                i_fastreg_inuse_count;
 160
 161         /* interrupt handling */
 162         struct tasklet_struct   i_send_tasklet;
 163         struct tasklet_struct   i_recv_tasklet;
 164
 165         /* tx */
 166         struct rds_ib_work_ring i_send_ring;
 167         struct rm_data_op       *i_data_op;
 168         struct rds_header       **i_send_hdrs;
 169         dma_addr_t              *i_send_hdrs_dma;
 170         struct rds_ib_send_work *i_sends;
 171         atomic_t                i_signaled_sends;
 172
 173         /* rx */
 174         struct mutex            i_recv_mutex;
 175         struct rds_ib_work_ring i_recv_ring;
 176         struct rds_ib_incoming  *i_ibinc;
 177         u32                     i_recv_data_rem;
 178         struct rds_header       **i_recv_hdrs;
 179         dma_addr_t              *i_recv_hdrs_dma;
 180         struct rds_ib_recv_work *i_recvs;
 181         u64                     i_ack_recv;     /* last ACK received */
 182         struct rds_ib_refill_cache i_cache_incs;
 183         struct rds_ib_refill_cache i_cache_frags;
 184         atomic_t                i_cache_allocs;
 185
 186         /* sending acks */
 187         unsigned long           i_ack_flags;
 188 #ifdef KERNEL_HAS_ATOMIC64
 189         atomic64_t              i_ack_next;     /* next ACK to send */
 190 #else
 191         spinlock_t              i_ack_lock;     /* protect i_ack_next */
 192         u64                     i_ack_next;     /* next ACK to send */
 193 #endif
 194         struct rds_header       *i_ack;
 195         struct ib_send_wr       i_ack_wr;
 196         struct ib_sge           i_ack_sge;
 197         dma_addr_t              i_ack_dma;
 198         unsigned long           i_ack_queued;
 199
 200         /* Flow control related information
 201          *
 202          * Our algorithm uses a pair variables that we need to access
 203          * atomically - one for the send credits, and one posted
 204          * recv credits we need to transfer to remote.
 205          * Rather than protect them using a slow spinlock, we put both into
 206          * a single atomic_t and update it using cmpxchg
 207          */
 208         atomic_t                i_credits;
 209
 210         /* Protocol version specific information */
 211         unsigned int            i_flowctl:1;    /* enable/disable flow ctl */
 212
 213         /* Batched completions */
 214         unsigned int            i_unsignaled_wrs;
 215
 216         /* Endpoint role in connection */
 217         bool                    i_active_side;
 218         atomic_t                i_cq_quiesce;
 219
 220         /* Send/Recv vectors */
 221         int                     i_scq_vector;
 222         int                     i_rcq_vector;
 223         u8                      i_sl;
 224 };
 225
 226 /* This assumes that atomic_t is at least 32 bits */
 227 #define IB_GET_SEND_CREDITS(v)  ((v) & 0xffff)
 228 #define IB_GET_POST_CREDITS(v)  ((v) >> 16)
 229 #define IB_SET_SEND_CREDITS(v)  ((v) & 0xffff)
 230 #define IB_SET_POST_CREDITS(v)  ((v) << 16)
 231
 232 struct rds_ib_ipaddr {
 233         struct list_head        list;
 234         __be32                  ipaddr;
 235         struct rcu_head         rcu;
 236 };
 237
 238 enum {
 239         RDS_IB_MR_8K_POOL,
 240         RDS_IB_MR_1M_POOL,
 241 };
 242
 243 struct rds_ib_device {
 244         struct list_head        list;
 245         struct list_head        ipaddr_list;
 246         struct list_head        conn_list;
 247         struct ib_device        *dev;
 248         struct ib_pd            *pd;
 249         struct dma_pool         *rid_hdrs_pool; /* RDS headers DMA pool */
 250         bool                    use_fastreg;
 251
 252         unsigned int            max_mrs;
 253         struct rds_ib_mr_pool   *mr_1m_pool;
 254         struct rds_ib_mr_pool   *mr_8k_pool;
 255         unsigned int            fmr_max_remaps;
 256         unsigned int            max_8k_mrs;
 257         unsigned int            max_1m_mrs;
 258         int                     max_sge;
 259         unsigned int            max_wrs;
 260         unsigned int            max_initiator_depth;
 261         unsigned int            max_responder_resources;
 262         spinlock_t              spinlock;       /* protect the above */
 263         refcount_t              refcount;
 264         struct work_struct      free_work;
 265         int                     *vector_load;
 266 };
 267
 268 #define ibdev_to_node(ibdev) dev_to_node((ibdev)->dev.parent)
 269 #define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)
 270
 271 /* bits for i_ack_flags */
 272 #define IB_ACK_IN_FLIGHT        0
 273 #define IB_ACK_REQUESTED        1
 274
 275 /* Magic WR_ID for ACKs */
 276 #define RDS_IB_ACK_WR_ID        (~(u64) 0)
 277
 278 struct rds_ib_statistics {
 279         uint64_t        s_ib_connect_raced;
 280         uint64_t        s_ib_listen_closed_stale;
 281         uint64_t        s_ib_evt_handler_call;
 282         uint64_t        s_ib_tasklet_call;
 283         uint64_t        s_ib_tx_cq_event;
 284         uint64_t        s_ib_tx_ring_full;
 285         uint64_t        s_ib_tx_throttle;
 286         uint64_t        s_ib_tx_sg_mapping_failure;
 287         uint64_t        s_ib_tx_stalled;
 288         uint64_t        s_ib_tx_credit_updates;
 289         uint64_t        s_ib_rx_cq_event;
 290         uint64_t        s_ib_rx_ring_empty;
 291         uint64_t        s_ib_rx_refill_from_cq;
 292         uint64_t        s_ib_rx_refill_from_thread;
 293         uint64_t        s_ib_rx_alloc_limit;
 294         uint64_t        s_ib_rx_total_frags;
 295         uint64_t        s_ib_rx_total_incs;
 296         uint64_t        s_ib_rx_credit_updates;
 297         uint64_t        s_ib_ack_sent;
 298         uint64_t        s_ib_ack_send_failure;
 299         uint64_t        s_ib_ack_send_delayed;
 300         uint64_t        s_ib_ack_send_piggybacked;
 301         uint64_t        s_ib_ack_received;
 302         uint64_t        s_ib_rdma_mr_8k_alloc;
 303         uint64_t        s_ib_rdma_mr_8k_free;
 304         uint64_t        s_ib_rdma_mr_8k_used;
 305         uint64_t        s_ib_rdma_mr_8k_pool_flush;
 306         uint64_t        s_ib_rdma_mr_8k_pool_wait;
 307         uint64_t        s_ib_rdma_mr_8k_pool_depleted;
 308         uint64_t        s_ib_rdma_mr_1m_alloc;
 309         uint64_t        s_ib_rdma_mr_1m_free;
 310         uint64_t        s_ib_rdma_mr_1m_used;
 311         uint64_t        s_ib_rdma_mr_1m_pool_flush;
 312         uint64_t        s_ib_rdma_mr_1m_pool_wait;
 313         uint64_t        s_ib_rdma_mr_1m_pool_depleted;
 314         uint64_t        s_ib_rdma_mr_8k_reused;
 315         uint64_t        s_ib_rdma_mr_1m_reused;
 316         uint64_t        s_ib_atomic_cswp;
 317         uint64_t        s_ib_atomic_fadd;
 318         uint64_t        s_ib_recv_added_to_cache;
 319         uint64_t        s_ib_recv_removed_from_cache;
 320 };
 321
 322 extern struct workqueue_struct *rds_ib_wq;
 323
 324 /*
 325  * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
 326  * doesn't define it.
 327  */
 328 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
 329                                               struct scatterlist *sglist,
 330                                               unsigned int sg_dma_len,
 331                                               int direction)
 332 {
 333         struct scatterlist *sg;
 334         unsigned int i;
 335
 336         for_each_sg(sglist, sg, sg_dma_len, i) {
 337                 ib_dma_sync_single_for_cpu(dev, sg_dma_address(sg),
 338                                            sg_dma_len(sg), direction);
 339         }
 340 }
 341 #define ib_dma_sync_sg_for_cpu  rds_ib_dma_sync_sg_for_cpu
 342
 343 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
 344                                                  struct scatterlist *sglist,
 345                                                  unsigned int sg_dma_len,
 346                                                  int direction)
 347 {
 348         struct scatterlist *sg;
 349         unsigned int i;
 350
 351         for_each_sg(sglist, sg, sg_dma_len, i) {
 352                 ib_dma_sync_single_for_device(dev, sg_dma_address(sg),
 353                                               sg_dma_len(sg), direction);
 354         }
 355 }
 356 #define ib_dma_sync_sg_for_device       rds_ib_dma_sync_sg_for_device
 357
 358
 359 /* ib.c */
 360 extern struct rds_transport rds_ib_transport;
 361 struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device);
 362 void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
 363 extern struct ib_client rds_ib_client;
 364
 365 extern unsigned int rds_ib_retry_count;
 366
 367 extern spinlock_t ib_nodev_conns_lock;
 368 extern struct list_head ib_nodev_conns;
 369
 370 /* ib_cm.c */
 371 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
 372 void rds_ib_conn_free(void *arg);
 373 int rds_ib_conn_path_connect(struct rds_conn_path *cp);
 374 void rds_ib_conn_path_shutdown(struct rds_conn_path *cp);
 375 void rds_ib_state_change(struct sock *sk);
 376 int rds_ib_listen_init(void);
 377 void rds_ib_listen_stop(void);
 378 __printf(2, 3)
 379 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
 380 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
 381                              struct rdma_cm_event *event, bool isv6);
 382 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id, bool isv6);
 383 void rds_ib_cm_connect_complete(struct rds_connection *conn,
 384                                 struct rdma_cm_event *event);
 385 struct rds_header **rds_dma_hdrs_alloc(struct ib_device *ibdev,
 386                                        struct dma_pool *pool,
 387                                        dma_addr_t **dma_addrs, u32 num_hdrs);
 388 void rds_dma_hdrs_free(struct dma_pool *pool, struct rds_header **hdrs,
 389                        dma_addr_t *dma_addrs, u32 num_hdrs);
 390
 391 #define rds_ib_conn_error(conn, fmt...) \
 392         __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
 393
 394 /* ib_rdma.c */
 395 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev,
 396                          struct in6_addr *ipaddr);
 397 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 398 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 399 void rds_ib_destroy_nodev_conns(void);
 400 void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
 401
 402 /* ib_recv.c */
 403 int rds_ib_recv_init(void);
 404 void rds_ib_recv_exit(void);
 405 int rds_ib_recv_path(struct rds_conn_path *conn);
 406 int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic, gfp_t gfp);
 407 void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
 408 void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp);
 409 void rds_ib_inc_free(struct rds_incoming *inc);
 410 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
 411 void rds_ib_recv_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc,
 412                              struct rds_ib_ack_state *state);
 413 void rds_ib_recv_tasklet_fn(unsigned long data);
 414 void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
 415 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
 416 void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
 417 void rds_ib_attempt_ack(struct rds_ib_connection *ic);
 418 void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
 419 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
 420 void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required);
 421
 422 /* ib_ring.c */
 423 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
 424 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
 425 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
 426 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
 427 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
 428 int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
 429 int rds_ib_ring_low(struct rds_ib_work_ring *ring);
 430 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
 431 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
 432 extern wait_queue_head_t rds_ib_ring_empty_wait;
 433
 434 /* ib_send.c */
 435 void rds_ib_xmit_path_complete(struct rds_conn_path *cp);
 436 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
 437                 unsigned int hdr_off, unsigned int sg, unsigned int off);
 438 void rds_ib_send_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
 439 void rds_ib_send_init_ring(struct rds_ib_connection *ic);
 440 void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
 441 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
 442 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
 443 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
 444 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
 445                              u32 *adv_credits, int need_posted, int max_posted);
 446 int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
 447
 448 /* ib_stats.c */
 449 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_ib_statistics, rds_ib_stats);
 450 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
 451 #define rds_ib_stats_add(member, count) \
 452                 rds_stats_add_which(rds_ib_stats, member, count)
 453 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
 454                                     unsigned int avail);
 455
 456 /* ib_sysctl.c */
 457 int rds_ib_sysctl_init(void);
 458 void rds_ib_sysctl_exit(void);
 459 extern unsigned long rds_ib_sysctl_max_send_wr;
 460 extern unsigned long rds_ib_sysctl_max_recv_wr;
 461 extern unsigned long rds_ib_sysctl_max_unsig_wrs;
 462 extern unsigned long rds_ib_sysctl_max_unsig_bytes;
 463 extern unsigned long rds_ib_sysctl_max_recv_allocation;
 464 extern unsigned int rds_ib_sysctl_flow_control;
 465
 466 #endif