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/interrupt.h> 7 #include <linux/pci.h> 8 #include <linux/slab.h> 9 #include "rds.h" 10 #include "rdma_transport.h" 11 12 #define RDS_FMR_SIZE 256 13 #define RDS_FMR_POOL_SIZE 8192 14 15 #define RDS_IB_MAX_SGE 8 16 #define RDS_IB_RECV_SGE 2 17 18 #define RDS_IB_DEFAULT_RECV_WR 1024 19 #define RDS_IB_DEFAULT_SEND_WR 256 20 21 #define RDS_IB_DEFAULT_RETRY_COUNT 2 22 23 #define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */ 24 25 #define RDS_IB_RECYCLE_BATCH_COUNT 32 26 27 extern struct rw_semaphore rds_ib_devices_lock; 28 extern struct list_head rds_ib_devices; 29 30 /* 31 * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to 32 * try and minimize the amount of memory tied up both the device and 33 * socket receive queues. 34 */ 35 struct rds_page_frag { 36 struct list_head f_item; 37 struct list_head f_cache_entry; 38 struct scatterlist f_sg; 39 }; 40 41 struct rds_ib_incoming { 42 struct list_head ii_frags; 43 struct list_head ii_cache_entry; 44 struct rds_incoming ii_inc; 45 }; 46 47 struct rds_ib_cache_head { 48 struct list_head *first; 49 unsigned long count; 50 }; 51 52 struct rds_ib_refill_cache { 53 struct rds_ib_cache_head *percpu; 54 struct list_head *xfer; 55 struct list_head *ready; 56 }; 57 58 struct rds_ib_connect_private { 59 /* Add new fields at the end, and don't permute existing fields. */ 60 __be32 dp_saddr; 61 __be32 dp_daddr; 62 u8 dp_protocol_major; 63 u8 dp_protocol_minor; 64 __be16 dp_protocol_minor_mask; /* bitmask */ 65 __be32 dp_reserved1; 66 __be64 dp_ack_seq; 67 __be32 dp_credit; /* non-zero enables flow ctl */ 68 }; 69 70 struct rds_ib_send_work { 71 void *s_op; 72 struct ib_send_wr s_wr; 73 struct ib_sge s_sge[RDS_IB_MAX_SGE]; 74 unsigned long s_queued; 75 }; 76 77 struct rds_ib_recv_work { 78 struct rds_ib_incoming *r_ibinc; 79 struct rds_page_frag *r_frag; 80 struct ib_recv_wr r_wr; 81 struct ib_sge r_sge[2]; 82 }; 83 84 struct rds_ib_work_ring { 85 u32 w_nr; 86 u32 w_alloc_ptr; 87 u32 w_alloc_ctr; 88 u32 w_free_ptr; 89 atomic_t w_free_ctr; 90 }; 91 92 struct rds_ib_device; 93 94 struct rds_ib_connection { 95 96 struct list_head ib_node; 97 struct rds_ib_device *rds_ibdev; 98 struct rds_connection *conn; 99 100 /* alphabet soup, IBTA style */ 101 struct rdma_cm_id *i_cm_id; 102 struct ib_pd *i_pd; 103 struct ib_mr *i_mr; 104 struct ib_cq *i_send_cq; 105 struct ib_cq *i_recv_cq; 106 107 /* tx */ 108 struct rds_ib_work_ring i_send_ring; 109 struct rm_data_op *i_data_op; 110 struct rds_header *i_send_hdrs; 111 u64 i_send_hdrs_dma; 112 struct rds_ib_send_work *i_sends; 113 atomic_t i_signaled_sends; 114 115 /* rx */ 116 struct tasklet_struct i_recv_tasklet; 117 struct mutex i_recv_mutex; 118 struct rds_ib_work_ring i_recv_ring; 119 struct rds_ib_incoming *i_ibinc; 120 u32 i_recv_data_rem; 121 struct rds_header *i_recv_hdrs; 122 u64 i_recv_hdrs_dma; 123 struct rds_ib_recv_work *i_recvs; 124 u64 i_ack_recv; /* last ACK received */ 125 struct rds_ib_refill_cache i_cache_incs; 126 struct rds_ib_refill_cache i_cache_frags; 127 128 /* sending acks */ 129 unsigned long i_ack_flags; 130 #ifdef KERNEL_HAS_ATOMIC64 131 atomic64_t i_ack_next; /* next ACK to send */ 132 #else 133 spinlock_t i_ack_lock; /* protect i_ack_next */ 134 u64 i_ack_next; /* next ACK to send */ 135 #endif 136 struct rds_header *i_ack; 137 struct ib_send_wr i_ack_wr; 138 struct ib_sge i_ack_sge; 139 u64 i_ack_dma; 140 unsigned long i_ack_queued; 141 142 /* Flow control related information 143 * 144 * Our algorithm uses a pair variables that we need to access 145 * atomically - one for the send credits, and one posted 146 * recv credits we need to transfer to remote. 147 * Rather than protect them using a slow spinlock, we put both into 148 * a single atomic_t and update it using cmpxchg 149 */ 150 atomic_t i_credits; 151 152 /* Protocol version specific information */ 153 unsigned int i_flowctl:1; /* enable/disable flow ctl */ 154 155 /* Batched completions */ 156 unsigned int i_unsignaled_wrs; 157 }; 158 159 /* This assumes that atomic_t is at least 32 bits */ 160 #define IB_GET_SEND_CREDITS(v) ((v) & 0xffff) 161 #define IB_GET_POST_CREDITS(v) ((v) >> 16) 162 #define IB_SET_SEND_CREDITS(v) ((v) & 0xffff) 163 #define IB_SET_POST_CREDITS(v) ((v) << 16) 164 165 struct rds_ib_ipaddr { 166 struct list_head list; 167 __be32 ipaddr; 168 }; 169 170 struct rds_ib_device { 171 struct list_head list; 172 struct list_head ipaddr_list; 173 struct list_head conn_list; 174 struct ib_device *dev; 175 struct ib_pd *pd; 176 struct ib_mr *mr; 177 struct rds_ib_mr_pool *mr_pool; 178 unsigned int fmr_max_remaps; 179 unsigned int max_fmrs; 180 int max_sge; 181 unsigned int max_wrs; 182 unsigned int max_initiator_depth; 183 unsigned int max_responder_resources; 184 spinlock_t spinlock; /* protect the above */ 185 atomic_t refcount; 186 struct work_struct free_work; 187 }; 188 189 #define pcidev_to_node(pcidev) pcibus_to_node(pcidev->bus) 190 #define ibdev_to_node(ibdev) pcidev_to_node(to_pci_dev(ibdev->dma_device)) 191 #define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev) 192 193 /* bits for i_ack_flags */ 194 #define IB_ACK_IN_FLIGHT 0 195 #define IB_ACK_REQUESTED 1 196 197 /* Magic WR_ID for ACKs */ 198 #define RDS_IB_ACK_WR_ID (~(u64) 0) 199 200 struct rds_ib_statistics { 201 uint64_t s_ib_connect_raced; 202 uint64_t s_ib_listen_closed_stale; 203 uint64_t s_ib_tx_cq_call; 204 uint64_t s_ib_tx_cq_event; 205 uint64_t s_ib_tx_ring_full; 206 uint64_t s_ib_tx_throttle; 207 uint64_t s_ib_tx_sg_mapping_failure; 208 uint64_t s_ib_tx_stalled; 209 uint64_t s_ib_tx_credit_updates; 210 uint64_t s_ib_rx_cq_call; 211 uint64_t s_ib_rx_cq_event; 212 uint64_t s_ib_rx_ring_empty; 213 uint64_t s_ib_rx_refill_from_cq; 214 uint64_t s_ib_rx_refill_from_thread; 215 uint64_t s_ib_rx_alloc_limit; 216 uint64_t s_ib_rx_credit_updates; 217 uint64_t s_ib_ack_sent; 218 uint64_t s_ib_ack_send_failure; 219 uint64_t s_ib_ack_send_delayed; 220 uint64_t s_ib_ack_send_piggybacked; 221 uint64_t s_ib_ack_received; 222 uint64_t s_ib_rdma_mr_alloc; 223 uint64_t s_ib_rdma_mr_free; 224 uint64_t s_ib_rdma_mr_used; 225 uint64_t s_ib_rdma_mr_pool_flush; 226 uint64_t s_ib_rdma_mr_pool_wait; 227 uint64_t s_ib_rdma_mr_pool_depleted; 228 uint64_t s_ib_atomic_cswp; 229 uint64_t s_ib_atomic_fadd; 230 }; 231 232 extern struct workqueue_struct *rds_ib_wq; 233 234 /* 235 * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h 236 * doesn't define it. 237 */ 238 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev, 239 struct scatterlist *sg, unsigned int sg_dma_len, int direction) 240 { 241 unsigned int i; 242 243 for (i = 0; i < sg_dma_len; ++i) { 244 ib_dma_sync_single_for_cpu(dev, 245 ib_sg_dma_address(dev, &sg[i]), 246 ib_sg_dma_len(dev, &sg[i]), 247 direction); 248 } 249 } 250 #define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu 251 252 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev, 253 struct scatterlist *sg, unsigned int sg_dma_len, int direction) 254 { 255 unsigned int i; 256 257 for (i = 0; i < sg_dma_len; ++i) { 258 ib_dma_sync_single_for_device(dev, 259 ib_sg_dma_address(dev, &sg[i]), 260 ib_sg_dma_len(dev, &sg[i]), 261 direction); 262 } 263 } 264 #define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device 265 266 267 /* ib.c */ 268 extern struct rds_transport rds_ib_transport; 269 struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device); 270 void rds_ib_dev_put(struct rds_ib_device *rds_ibdev); 271 extern struct ib_client rds_ib_client; 272 273 extern unsigned int fmr_message_size; 274 extern unsigned int rds_ib_retry_count; 275 276 extern spinlock_t ib_nodev_conns_lock; 277 extern struct list_head ib_nodev_conns; 278 279 /* ib_cm.c */ 280 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp); 281 void rds_ib_conn_free(void *arg); 282 int rds_ib_conn_connect(struct rds_connection *conn); 283 void rds_ib_conn_shutdown(struct rds_connection *conn); 284 void rds_ib_state_change(struct sock *sk); 285 int rds_ib_listen_init(void); 286 void rds_ib_listen_stop(void); 287 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...); 288 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id, 289 struct rdma_cm_event *event); 290 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id); 291 void rds_ib_cm_connect_complete(struct rds_connection *conn, 292 struct rdma_cm_event *event); 293 294 295 #define rds_ib_conn_error(conn, fmt...) \ 296 __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt) 297 298 /* ib_rdma.c */ 299 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr); 300 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn); 301 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn); 302 void rds_ib_destroy_nodev_conns(void); 303 struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *); 304 void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo); 305 void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *); 306 void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents, 307 struct rds_sock *rs, u32 *key_ret); 308 void rds_ib_sync_mr(void *trans_private, int dir); 309 void rds_ib_free_mr(void *trans_private, int invalidate); 310 void rds_ib_flush_mrs(void); 311 312 /* ib_recv.c */ 313 int rds_ib_recv_init(void); 314 void rds_ib_recv_exit(void); 315 int rds_ib_recv(struct rds_connection *conn); 316 int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic); 317 void rds_ib_recv_free_caches(struct rds_ib_connection *ic); 318 void rds_ib_recv_refill(struct rds_connection *conn, int prefill); 319 void rds_ib_inc_free(struct rds_incoming *inc); 320 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov, 321 size_t size); 322 void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context); 323 void rds_ib_recv_tasklet_fn(unsigned long data); 324 void rds_ib_recv_init_ring(struct rds_ib_connection *ic); 325 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic); 326 void rds_ib_recv_init_ack(struct rds_ib_connection *ic); 327 void rds_ib_attempt_ack(struct rds_ib_connection *ic); 328 void rds_ib_ack_send_complete(struct rds_ib_connection *ic); 329 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic); 330 331 /* ib_ring.c */ 332 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr); 333 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr); 334 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos); 335 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val); 336 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val); 337 int rds_ib_ring_empty(struct rds_ib_work_ring *ring); 338 int rds_ib_ring_low(struct rds_ib_work_ring *ring); 339 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring); 340 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest); 341 extern wait_queue_head_t rds_ib_ring_empty_wait; 342 343 /* ib_send.c */ 344 char *rds_ib_wc_status_str(enum ib_wc_status status); 345 void rds_ib_xmit_complete(struct rds_connection *conn); 346 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm, 347 unsigned int hdr_off, unsigned int sg, unsigned int off); 348 void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context); 349 void rds_ib_send_init_ring(struct rds_ib_connection *ic); 350 void rds_ib_send_clear_ring(struct rds_ib_connection *ic); 351 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op); 352 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits); 353 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted); 354 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted, 355 u32 *adv_credits, int need_posted, int max_posted); 356 int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op); 357 358 /* ib_stats.c */ 359 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats); 360 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member) 361 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter, 362 unsigned int avail); 363 364 /* ib_sysctl.c */ 365 int rds_ib_sysctl_init(void); 366 void rds_ib_sysctl_exit(void); 367 extern unsigned long rds_ib_sysctl_max_send_wr; 368 extern unsigned long rds_ib_sysctl_max_recv_wr; 369 extern unsigned long rds_ib_sysctl_max_unsig_wrs; 370 extern unsigned long rds_ib_sysctl_max_unsig_bytes; 371 extern unsigned long rds_ib_sysctl_max_recv_allocation; 372 extern unsigned int rds_ib_sysctl_flow_control; 373 374 #endif 375