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               4096
  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 extern struct list_head rds_ib_devices;
  25
  26 /*
  27  * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
  28  * try and minimize the amount of memory tied up both the device and
  29  * socket receive queues.
  30  */
  31 /* page offset of the final full frag that fits in the page */
  32 #define RDS_PAGE_LAST_OFF (((PAGE_SIZE  / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE)
  33 struct rds_page_frag {
  34         struct list_head        f_item;
  35         struct page             *f_page;
  36         unsigned long           f_offset;
  37         dma_addr_t              f_mapped;
  38 };
  39
  40 struct rds_ib_incoming {
  41         struct list_head        ii_frags;
  42         struct rds_incoming     ii_inc;
  43 };
  44
  45 struct rds_ib_connect_private {
  46         /* Add new fields at the end, and don't permute existing fields. */
  47         __be32                  dp_saddr;
  48         __be32                  dp_daddr;
  49         u8                      dp_protocol_major;
  50         u8                      dp_protocol_minor;
  51         __be16                  dp_protocol_minor_mask; /* bitmask */
  52         __be32                  dp_reserved1;
  53         __be64                  dp_ack_seq;
  54         __be32                  dp_credit;              /* non-zero enables flow ctl */
  55 };
  56
  57 struct rds_ib_send_work {
  58         void                    *s_op;
  59         struct ib_send_wr       s_wr;
  60         struct ib_sge           s_sge[RDS_IB_MAX_SGE];
  61         unsigned long           s_queued;
  62 };
  63
  64 struct rds_ib_recv_work {
  65         struct rds_ib_incoming  *r_ibinc;
  66         struct rds_page_frag    *r_frag;
  67         struct ib_recv_wr       r_wr;
  68         struct ib_sge           r_sge[2];
  69 };
  70
  71 struct rds_ib_work_ring {
  72         u32             w_nr;
  73         u32             w_alloc_ptr;
  74         u32             w_alloc_ctr;
  75         u32             w_free_ptr;
  76         atomic_t        w_free_ctr;
  77 };
  78
  79 struct rds_ib_device;
  80
  81 struct rds_ib_connection {
  82
  83         struct list_head        ib_node;
  84         struct rds_ib_device    *rds_ibdev;
  85         struct rds_connection   *conn;
  86
  87         /* alphabet soup, IBTA style */
  88         struct rdma_cm_id       *i_cm_id;
  89         struct ib_pd            *i_pd;
  90         struct ib_mr            *i_mr;
  91         struct ib_cq            *i_send_cq;
  92         struct ib_cq            *i_recv_cq;
  93
  94         /* tx */
  95         struct rds_ib_work_ring i_send_ring;
  96         struct rm_data_op       *i_data_op;
  97         struct rds_header       *i_send_hdrs;
  98         u64                     i_send_hdrs_dma;
  99         struct rds_ib_send_work *i_sends;
 100
 101         /* rx */
 102         struct tasklet_struct   i_recv_tasklet;
 103         struct mutex            i_recv_mutex;
 104         struct rds_ib_work_ring i_recv_ring;
 105         struct rds_ib_incoming  *i_ibinc;
 106         u32                     i_recv_data_rem;
 107         struct rds_header       *i_recv_hdrs;
 108         u64                     i_recv_hdrs_dma;
 109         struct rds_ib_recv_work *i_recvs;
 110         struct rds_page_frag    i_frag;
 111         u64                     i_ack_recv;     /* last ACK received */
 112
 113         /* sending acks */
 114         unsigned long           i_ack_flags;
 115 #ifdef KERNEL_HAS_ATOMIC64
 116         atomic64_t              i_ack_next;     /* next ACK to send */
 117 #else
 118         spinlock_t              i_ack_lock;     /* protect i_ack_next */
 119         u64                     i_ack_next;     /* next ACK to send */
 120 #endif
 121         struct rds_header       *i_ack;
 122         struct ib_send_wr       i_ack_wr;
 123         struct ib_sge           i_ack_sge;
 124         u64                     i_ack_dma;
 125         unsigned long           i_ack_queued;
 126
 127         /* Flow control related information
 128          *
 129          * Our algorithm uses a pair variables that we need to access
 130          * atomically - one for the send credits, and one posted
 131          * recv credits we need to transfer to remote.
 132          * Rather than protect them using a slow spinlock, we put both into
 133          * a single atomic_t and update it using cmpxchg
 134          */
 135         atomic_t                i_credits;
 136
 137         /* Protocol version specific information */
 138         unsigned int            i_flowctl:1;    /* enable/disable flow ctl */
 139
 140         /* Batched completions */
 141         unsigned int            i_unsignaled_wrs;
 142 };
 143
 144 /* This assumes that atomic_t is at least 32 bits */
 145 #define IB_GET_SEND_CREDITS(v)  ((v) & 0xffff)
 146 #define IB_GET_POST_CREDITS(v)  ((v) >> 16)
 147 #define IB_SET_SEND_CREDITS(v)  ((v) & 0xffff)
 148 #define IB_SET_POST_CREDITS(v)  ((v) << 16)
 149
 150 struct rds_ib_ipaddr {
 151         struct list_head        list;
 152         __be32                  ipaddr;
 153 };
 154
 155 struct rds_ib_device {
 156         struct list_head        list;
 157         struct list_head        ipaddr_list;
 158         struct list_head        conn_list;
 159         struct ib_device        *dev;
 160         struct ib_pd            *pd;
 161         struct ib_mr            *mr;
 162         struct rds_ib_mr_pool   *mr_pool;
 163         unsigned int            fmr_max_remaps;
 164         unsigned int            max_fmrs;
 165         int                     max_sge;
 166         unsigned int            max_wrs;
 167         unsigned int            max_initiator_depth;
 168         unsigned int            max_responder_resources;
 169         spinlock_t              spinlock;       /* protect the above */
 170 };
 171
 172 #define pcidev_to_node(pcidev) pcibus_to_node(pcidev->bus)
 173 #define ibdev_to_node(ibdev) pcidev_to_node(to_pci_dev(ibdev->dma_device))
 174 #define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)
 175
 176 /* bits for i_ack_flags */
 177 #define IB_ACK_IN_FLIGHT        0
 178 #define IB_ACK_REQUESTED        1
 179
 180 /* Magic WR_ID for ACKs */
 181 #define RDS_IB_ACK_WR_ID        (~(u64) 0)
 182
 183 struct rds_ib_statistics {
 184         uint64_t        s_ib_connect_raced;
 185         uint64_t        s_ib_listen_closed_stale;
 186         uint64_t        s_ib_tx_cq_call;
 187         uint64_t        s_ib_tx_cq_event;
 188         uint64_t        s_ib_tx_ring_full;
 189         uint64_t        s_ib_tx_throttle;
 190         uint64_t        s_ib_tx_sg_mapping_failure;
 191         uint64_t        s_ib_tx_stalled;
 192         uint64_t        s_ib_tx_credit_updates;
 193         uint64_t        s_ib_rx_cq_call;
 194         uint64_t        s_ib_rx_cq_event;
 195         uint64_t        s_ib_rx_ring_empty;
 196         uint64_t        s_ib_rx_refill_from_cq;
 197         uint64_t        s_ib_rx_refill_from_thread;
 198         uint64_t        s_ib_rx_alloc_limit;
 199         uint64_t        s_ib_rx_credit_updates;
 200         uint64_t        s_ib_ack_sent;
 201         uint64_t        s_ib_ack_send_failure;
 202         uint64_t        s_ib_ack_send_delayed;
 203         uint64_t        s_ib_ack_send_piggybacked;
 204         uint64_t        s_ib_ack_received;
 205         uint64_t        s_ib_rdma_mr_alloc;
 206         uint64_t        s_ib_rdma_mr_free;
 207         uint64_t        s_ib_rdma_mr_used;
 208         uint64_t        s_ib_rdma_mr_pool_flush;
 209         uint64_t        s_ib_rdma_mr_pool_wait;
 210         uint64_t        s_ib_rdma_mr_pool_depleted;
 211         uint64_t        s_ib_atomic_cswp;
 212         uint64_t        s_ib_atomic_fadd;
 213 };
 214
 215 extern struct workqueue_struct *rds_ib_wq;
 216
 217 /*
 218  * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
 219  * doesn't define it.
 220  */
 221 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
 222                 struct scatterlist *sg, unsigned int sg_dma_len, int direction)
 223 {
 224         unsigned int i;
 225
 226         for (i = 0; i < sg_dma_len; ++i) {
 227                 ib_dma_sync_single_for_cpu(dev,
 228                                 ib_sg_dma_address(dev, &sg[i]),
 229                                 ib_sg_dma_len(dev, &sg[i]),
 230                                 direction);
 231         }
 232 }
 233 #define ib_dma_sync_sg_for_cpu  rds_ib_dma_sync_sg_for_cpu
 234
 235 static inline void rds_ib_dma_sync_sg_for_device(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_device(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_device       rds_ib_dma_sync_sg_for_device
 248
 249
 250 /* ib.c */
 251 extern struct rds_transport rds_ib_transport;
 252 extern void rds_ib_add_one(struct ib_device *device);
 253 extern void rds_ib_remove_one(struct ib_device *device);
 254 extern struct ib_client rds_ib_client;
 255
 256 extern unsigned int fmr_pool_size;
 257 extern unsigned int fmr_message_size;
 258 extern unsigned int rds_ib_retry_count;
 259
 260 extern spinlock_t ib_nodev_conns_lock;
 261 extern struct list_head ib_nodev_conns;
 262
 263 /* ib_cm.c */
 264 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
 265 void rds_ib_conn_free(void *arg);
 266 int rds_ib_conn_connect(struct rds_connection *conn);
 267 void rds_ib_conn_shutdown(struct rds_connection *conn);
 268 void rds_ib_state_change(struct sock *sk);
 269 int __init rds_ib_listen_init(void);
 270 void rds_ib_listen_stop(void);
 271 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
 272 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
 273                              struct rdma_cm_event *event);
 274 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
 275 void rds_ib_cm_connect_complete(struct rds_connection *conn,
 276                                 struct rdma_cm_event *event);
 277
 278
 279 #define rds_ib_conn_error(conn, fmt...) \
 280         __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
 281
 282 /* ib_rdma.c */
 283 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
 284 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 285 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 286 void __rds_ib_destroy_conns(struct list_head *list, spinlock_t *list_lock);
 287 static inline void rds_ib_destroy_nodev_conns(void)
 288 {
 289         __rds_ib_destroy_conns(&ib_nodev_conns, &ib_nodev_conns_lock);
 290 }
 291 static inline void rds_ib_destroy_conns(struct rds_ib_device *rds_ibdev)
 292 {
 293         __rds_ib_destroy_conns(&rds_ibdev->conn_list, &rds_ibdev->spinlock);
 294 }
 295 struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *);
 296 void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo);
 297 void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
 298 void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
 299                     struct rds_sock *rs, u32 *key_ret);
 300 void rds_ib_sync_mr(void *trans_private, int dir);
 301 void rds_ib_free_mr(void *trans_private, int invalidate);
 302 void rds_ib_flush_mrs(void);
 303
 304 /* ib_recv.c */
 305 int __init rds_ib_recv_init(void);
 306 void rds_ib_recv_exit(void);
 307 int rds_ib_recv(struct rds_connection *conn);
 308 int rds_ib_recv_refill(struct rds_connection *conn, int prefill);
 309 void rds_ib_inc_free(struct rds_incoming *inc);
 310 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov,
 311                              size_t size);
 312 void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context);
 313 void rds_ib_recv_tasklet_fn(unsigned long data);
 314 void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
 315 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
 316 void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
 317 void rds_ib_attempt_ack(struct rds_ib_connection *ic);
 318 void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
 319 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
 320
 321 /* ib_ring.c */
 322 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
 323 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
 324 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
 325 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
 326 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
 327 int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
 328 int rds_ib_ring_low(struct rds_ib_work_ring *ring);
 329 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
 330 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
 331 extern wait_queue_head_t rds_ib_ring_empty_wait;
 332
 333 /* ib_send.c */
 334 void rds_ib_xmit_complete(struct rds_connection *conn);
 335 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
 336                 unsigned int hdr_off, unsigned int sg, unsigned int off);
 337 void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context);
 338 void rds_ib_send_init_ring(struct rds_ib_connection *ic);
 339 void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
 340 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
 341 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
 342 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
 343 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
 344                              u32 *adv_credits, int need_posted, int max_posted);
 345 int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
 346
 347 /* ib_stats.c */
 348 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
 349 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
 350 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
 351                                     unsigned int avail);
 352
 353 /* ib_sysctl.c */
 354 int __init rds_ib_sysctl_init(void);
 355 void rds_ib_sysctl_exit(void);
 356 extern unsigned long rds_ib_sysctl_max_send_wr;
 357 extern unsigned long rds_ib_sysctl_max_recv_wr;
 358 extern unsigned long rds_ib_sysctl_max_unsig_wrs;
 359 extern unsigned long rds_ib_sysctl_max_unsig_bytes;
 360 extern unsigned long rds_ib_sysctl_max_recv_allocation;
 361 extern unsigned int rds_ib_sysctl_flow_control;
 362 extern ctl_table rds_ib_sysctl_table[];
 363
 364 #endif