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 "rds.h" 7 #include "rdma_transport.h" 8 9 #define RDS_FMR_SIZE 256 10 #define RDS_FMR_POOL_SIZE 4096 11 12 #define RDS_IB_MAX_SGE 8 13 #define RDS_IB_RECV_SGE 2 14 15 #define RDS_IB_DEFAULT_RECV_WR 1024 16 #define RDS_IB_DEFAULT_SEND_WR 256 17 18 #define RDS_IB_DEFAULT_RETRY_COUNT 2 19 20 #define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */ 21 22 extern struct list_head rds_ib_devices; 23 24 /* 25 * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to 26 * try and minimize the amount of memory tied up both the device and 27 * socket receive queues. 28 */ 29 /* page offset of the final full frag that fits in the page */ 30 #define RDS_PAGE_LAST_OFF (((PAGE_SIZE / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE) 31 struct rds_page_frag { 32 struct list_head f_item; 33 struct page *f_page; 34 unsigned long f_offset; 35 dma_addr_t f_mapped; 36 }; 37 38 struct rds_ib_incoming { 39 struct list_head ii_frags; 40 struct rds_incoming ii_inc; 41 }; 42 43 struct rds_ib_connect_private { 44 /* Add new fields at the end, and don't permute existing fields. */ 45 __be32 dp_saddr; 46 __be32 dp_daddr; 47 u8 dp_protocol_major; 48 u8 dp_protocol_minor; 49 __be16 dp_protocol_minor_mask; /* bitmask */ 50 __be32 dp_reserved1; 51 __be64 dp_ack_seq; 52 __be32 dp_credit; /* non-zero enables flow ctl */ 53 }; 54 55 struct rds_ib_send_work { 56 struct rds_message *s_rm; 57 struct rds_rdma_op *s_op; 58 struct ib_send_wr s_wr; 59 struct ib_sge s_sge[RDS_IB_MAX_SGE]; 60 unsigned long s_queued; 61 }; 62 63 struct rds_ib_recv_work { 64 struct rds_ib_incoming *r_ibinc; 65 struct rds_page_frag *r_frag; 66 struct ib_recv_wr r_wr; 67 struct ib_sge r_sge[2]; 68 }; 69 70 struct rds_ib_work_ring { 71 u32 w_nr; 72 u32 w_alloc_ptr; 73 u32 w_alloc_ctr; 74 u32 w_free_ptr; 75 atomic_t w_free_ctr; 76 }; 77 78 struct rds_ib_device; 79 80 struct rds_ib_connection { 81 82 struct list_head ib_node; 83 struct rds_ib_device *rds_ibdev; 84 struct rds_connection *conn; 85 86 /* alphabet soup, IBTA style */ 87 struct rdma_cm_id *i_cm_id; 88 struct ib_pd *i_pd; 89 struct ib_mr *i_mr; 90 struct ib_cq *i_send_cq; 91 struct ib_cq *i_recv_cq; 92 93 /* tx */ 94 struct rds_ib_work_ring i_send_ring; 95 struct rds_message *i_rm; 96 struct rds_header *i_send_hdrs; 97 u64 i_send_hdrs_dma; 98 struct rds_ib_send_work *i_sends; 99 100 /* rx */ 101 struct mutex i_recv_mutex; 102 struct rds_ib_work_ring i_recv_ring; 103 struct rds_ib_incoming *i_ibinc; 104 u32 i_recv_data_rem; 105 struct rds_header *i_recv_hdrs; 106 u64 i_recv_hdrs_dma; 107 struct rds_ib_recv_work *i_recvs; 108 struct rds_page_frag i_frag; 109 u64 i_ack_recv; /* last ACK received */ 110 111 /* sending acks */ 112 unsigned long i_ack_flags; 113 #ifdef KERNEL_HAS_ATOMIC64 114 atomic64_t i_ack_next; /* next ACK to send */ 115 #else 116 spinlock_t i_ack_lock; /* protect i_ack_next */ 117 u64 i_ack_next; /* next ACK to send */ 118 #endif 119 struct rds_header *i_ack; 120 struct ib_send_wr i_ack_wr; 121 struct ib_sge i_ack_sge; 122 u64 i_ack_dma; 123 unsigned long i_ack_queued; 124 125 /* Flow control related information 126 * 127 * Our algorithm uses a pair variables that we need to access 128 * atomically - one for the send credits, and one posted 129 * recv credits we need to transfer to remote. 130 * Rather than protect them using a slow spinlock, we put both into 131 * a single atomic_t and update it using cmpxchg 132 */ 133 atomic_t i_credits; 134 135 /* Protocol version specific information */ 136 unsigned int i_flowctl:1; /* enable/disable flow ctl */ 137 138 /* Batched completions */ 139 unsigned int i_unsignaled_wrs; 140 long i_unsignaled_bytes; 141 }; 142 143 /* This assumes that atomic_t is at least 32 bits */ 144 #define IB_GET_SEND_CREDITS(v) ((v) & 0xffff) 145 #define IB_GET_POST_CREDITS(v) ((v) >> 16) 146 #define IB_SET_SEND_CREDITS(v) ((v) & 0xffff) 147 #define IB_SET_POST_CREDITS(v) ((v) << 16) 148 149 struct rds_ib_ipaddr { 150 struct list_head list; 151 __be32 ipaddr; 152 }; 153 154 struct rds_ib_device { 155 struct list_head list; 156 struct list_head ipaddr_list; 157 struct list_head conn_list; 158 struct ib_device *dev; 159 struct ib_pd *pd; 160 struct ib_mr *mr; 161 struct rds_ib_mr_pool *mr_pool; 162 unsigned int fmr_max_remaps; 163 unsigned int max_fmrs; 164 int max_sge; 165 unsigned int max_wrs; 166 spinlock_t spinlock; /* protect the above */ 167 }; 168 169 /* bits for i_ack_flags */ 170 #define IB_ACK_IN_FLIGHT 0 171 #define IB_ACK_REQUESTED 1 172 173 /* Magic WR_ID for ACKs */ 174 #define RDS_IB_ACK_WR_ID (~(u64) 0) 175 176 struct rds_ib_statistics { 177 uint64_t s_ib_connect_raced; 178 uint64_t s_ib_listen_closed_stale; 179 uint64_t s_ib_tx_cq_call; 180 uint64_t s_ib_tx_cq_event; 181 uint64_t s_ib_tx_ring_full; 182 uint64_t s_ib_tx_throttle; 183 uint64_t s_ib_tx_sg_mapping_failure; 184 uint64_t s_ib_tx_stalled; 185 uint64_t s_ib_tx_credit_updates; 186 uint64_t s_ib_rx_cq_call; 187 uint64_t s_ib_rx_cq_event; 188 uint64_t s_ib_rx_ring_empty; 189 uint64_t s_ib_rx_refill_from_cq; 190 uint64_t s_ib_rx_refill_from_thread; 191 uint64_t s_ib_rx_alloc_limit; 192 uint64_t s_ib_rx_credit_updates; 193 uint64_t s_ib_ack_sent; 194 uint64_t s_ib_ack_send_failure; 195 uint64_t s_ib_ack_send_delayed; 196 uint64_t s_ib_ack_send_piggybacked; 197 uint64_t s_ib_ack_received; 198 uint64_t s_ib_rdma_mr_alloc; 199 uint64_t s_ib_rdma_mr_free; 200 uint64_t s_ib_rdma_mr_used; 201 uint64_t s_ib_rdma_mr_pool_flush; 202 uint64_t s_ib_rdma_mr_pool_wait; 203 uint64_t s_ib_rdma_mr_pool_depleted; 204 }; 205 206 extern struct workqueue_struct *rds_ib_wq; 207 208 /* 209 * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h 210 * doesn't define it. 211 */ 212 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev, 213 struct scatterlist *sg, unsigned int sg_dma_len, int direction) 214 { 215 unsigned int i; 216 217 for (i = 0; i < sg_dma_len; ++i) { 218 ib_dma_sync_single_for_cpu(dev, 219 ib_sg_dma_address(dev, &sg[i]), 220 ib_sg_dma_len(dev, &sg[i]), 221 direction); 222 } 223 } 224 #define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu 225 226 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev, 227 struct scatterlist *sg, unsigned int sg_dma_len, int direction) 228 { 229 unsigned int i; 230 231 for (i = 0; i < sg_dma_len; ++i) { 232 ib_dma_sync_single_for_device(dev, 233 ib_sg_dma_address(dev, &sg[i]), 234 ib_sg_dma_len(dev, &sg[i]), 235 direction); 236 } 237 } 238 #define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device 239 240 241 /* ib.c */ 242 extern struct rds_transport rds_ib_transport; 243 extern void rds_ib_add_one(struct ib_device *device); 244 extern void rds_ib_remove_one(struct ib_device *device); 245 extern struct ib_client rds_ib_client; 246 247 extern unsigned int fmr_pool_size; 248 extern unsigned int fmr_message_size; 249 extern unsigned int rds_ib_retry_count; 250 251 extern spinlock_t ib_nodev_conns_lock; 252 extern struct list_head ib_nodev_conns; 253 254 /* ib_cm.c */ 255 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp); 256 void rds_ib_conn_free(void *arg); 257 int rds_ib_conn_connect(struct rds_connection *conn); 258 void rds_ib_conn_shutdown(struct rds_connection *conn); 259 void rds_ib_state_change(struct sock *sk); 260 int __init rds_ib_listen_init(void); 261 void rds_ib_listen_stop(void); 262 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...); 263 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id, 264 struct rdma_cm_event *event); 265 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id); 266 void rds_ib_cm_connect_complete(struct rds_connection *conn, 267 struct rdma_cm_event *event); 268 269 270 #define rds_ib_conn_error(conn, fmt...) \ 271 __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt) 272 273 /* ib_rdma.c */ 274 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr); 275 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn); 276 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn); 277 void __rds_ib_destroy_conns(struct list_head *list, spinlock_t *list_lock); 278 static inline void rds_ib_destroy_nodev_conns(void) 279 { 280 __rds_ib_destroy_conns(&ib_nodev_conns, &ib_nodev_conns_lock); 281 } 282 static inline void rds_ib_destroy_conns(struct rds_ib_device *rds_ibdev) 283 { 284 __rds_ib_destroy_conns(&rds_ibdev->conn_list, &rds_ibdev->spinlock); 285 } 286 struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *); 287 void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo); 288 void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *); 289 void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents, 290 struct rds_sock *rs, u32 *key_ret); 291 void rds_ib_sync_mr(void *trans_private, int dir); 292 void rds_ib_free_mr(void *trans_private, int invalidate); 293 void rds_ib_flush_mrs(void); 294 295 /* ib_recv.c */ 296 int __init rds_ib_recv_init(void); 297 void rds_ib_recv_exit(void); 298 int rds_ib_recv(struct rds_connection *conn); 299 int rds_ib_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp, 300 gfp_t page_gfp, int prefill); 301 void rds_ib_inc_purge(struct rds_incoming *inc); 302 void rds_ib_inc_free(struct rds_incoming *inc); 303 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov, 304 size_t size); 305 void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context); 306 void rds_ib_recv_init_ring(struct rds_ib_connection *ic); 307 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic); 308 void rds_ib_recv_init_ack(struct rds_ib_connection *ic); 309 void rds_ib_attempt_ack(struct rds_ib_connection *ic); 310 void rds_ib_ack_send_complete(struct rds_ib_connection *ic); 311 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic); 312 313 /* ib_ring.c */ 314 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr); 315 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr); 316 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos); 317 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val); 318 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val); 319 int rds_ib_ring_empty(struct rds_ib_work_ring *ring); 320 int rds_ib_ring_low(struct rds_ib_work_ring *ring); 321 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring); 322 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest); 323 extern wait_queue_head_t rds_ib_ring_empty_wait; 324 325 /* ib_send.c */ 326 void rds_ib_xmit_complete(struct rds_connection *conn); 327 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm, 328 unsigned int hdr_off, unsigned int sg, unsigned int off); 329 void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context); 330 void rds_ib_send_init_ring(struct rds_ib_connection *ic); 331 void rds_ib_send_clear_ring(struct rds_ib_connection *ic); 332 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rds_rdma_op *op); 333 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits); 334 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted); 335 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted, 336 u32 *adv_credits, int need_posted, int max_posted); 337 338 /* ib_stats.c */ 339 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats); 340 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member) 341 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter, 342 unsigned int avail); 343 344 /* ib_sysctl.c */ 345 int __init rds_ib_sysctl_init(void); 346 void rds_ib_sysctl_exit(void); 347 extern unsigned long rds_ib_sysctl_max_send_wr; 348 extern unsigned long rds_ib_sysctl_max_recv_wr; 349 extern unsigned long rds_ib_sysctl_max_unsig_wrs; 350 extern unsigned long rds_ib_sysctl_max_unsig_bytes; 351 extern unsigned long rds_ib_sysctl_max_recv_allocation; 352 extern unsigned int rds_ib_sysctl_flow_control; 353 extern ctl_table rds_ib_sysctl_table[]; 354 355 /* 356 * Helper functions for getting/setting the header and data SGEs in 357 * RDS packets (not RDMA) 358 * 359 * From version 3.1 onwards, header is in front of data in the sge. 360 */ 361 static inline struct ib_sge * 362 rds_ib_header_sge(struct rds_ib_connection *ic, struct ib_sge *sge) 363 { 364 if (ic->conn->c_version > RDS_PROTOCOL_3_0) 365 return &sge[0]; 366 else 367 return &sge[1]; 368 } 369 370 static inline struct ib_sge * 371 rds_ib_data_sge(struct rds_ib_connection *ic, struct ib_sge *sge) 372 { 373 if (ic->conn->c_version > RDS_PROTOCOL_3_0) 374 return &sge[1]; 375 else 376 return &sge[0]; 377 } 378 379 #endif 380