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 tasklet_struct i_recv_tasklet; 102 struct mutex i_recv_mutex; 103 struct rds_ib_work_ring i_recv_ring; 104 struct rds_ib_incoming *i_ibinc; 105 u32 i_recv_data_rem; 106 struct rds_header *i_recv_hdrs; 107 u64 i_recv_hdrs_dma; 108 struct rds_ib_recv_work *i_recvs; 109 struct rds_page_frag i_frag; 110 u64 i_ack_recv; /* last ACK received */ 111 112 /* sending acks */ 113 unsigned long i_ack_flags; 114 #ifdef KERNEL_HAS_ATOMIC64 115 atomic64_t i_ack_next; /* next ACK to send */ 116 #else 117 spinlock_t i_ack_lock; /* protect i_ack_next */ 118 u64 i_ack_next; /* next ACK to send */ 119 #endif 120 struct rds_header *i_ack; 121 struct ib_send_wr i_ack_wr; 122 struct ib_sge i_ack_sge; 123 u64 i_ack_dma; 124 unsigned long i_ack_queued; 125 126 /* Flow control related information 127 * 128 * Our algorithm uses a pair variables that we need to access 129 * atomically - one for the send credits, and one posted 130 * recv credits we need to transfer to remote. 131 * Rather than protect them using a slow spinlock, we put both into 132 * a single atomic_t and update it using cmpxchg 133 */ 134 atomic_t i_credits; 135 136 /* Protocol version specific information */ 137 unsigned int i_flowctl:1; /* enable/disable flow ctl */ 138 139 /* Batched completions */ 140 unsigned int i_unsignaled_wrs; 141 long i_unsignaled_bytes; 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 spinlock_t spinlock; /* protect the above */ 168 }; 169 170 /* bits for i_ack_flags */ 171 #define IB_ACK_IN_FLIGHT 0 172 #define IB_ACK_REQUESTED 1 173 174 /* Magic WR_ID for ACKs */ 175 #define RDS_IB_ACK_WR_ID (~(u64) 0) 176 177 struct rds_ib_statistics { 178 uint64_t s_ib_connect_raced; 179 uint64_t s_ib_listen_closed_stale; 180 uint64_t s_ib_tx_cq_call; 181 uint64_t s_ib_tx_cq_event; 182 uint64_t s_ib_tx_ring_full; 183 uint64_t s_ib_tx_throttle; 184 uint64_t s_ib_tx_sg_mapping_failure; 185 uint64_t s_ib_tx_stalled; 186 uint64_t s_ib_tx_credit_updates; 187 uint64_t s_ib_rx_cq_call; 188 uint64_t s_ib_rx_cq_event; 189 uint64_t s_ib_rx_ring_empty; 190 uint64_t s_ib_rx_refill_from_cq; 191 uint64_t s_ib_rx_refill_from_thread; 192 uint64_t s_ib_rx_alloc_limit; 193 uint64_t s_ib_rx_credit_updates; 194 uint64_t s_ib_ack_sent; 195 uint64_t s_ib_ack_send_failure; 196 uint64_t s_ib_ack_send_delayed; 197 uint64_t s_ib_ack_send_piggybacked; 198 uint64_t s_ib_ack_received; 199 uint64_t s_ib_rdma_mr_alloc; 200 uint64_t s_ib_rdma_mr_free; 201 uint64_t s_ib_rdma_mr_used; 202 uint64_t s_ib_rdma_mr_pool_flush; 203 uint64_t s_ib_rdma_mr_pool_wait; 204 uint64_t s_ib_rdma_mr_pool_depleted; 205 }; 206 207 extern struct workqueue_struct *rds_ib_wq; 208 209 /* 210 * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h 211 * doesn't define it. 212 */ 213 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev, 214 struct scatterlist *sg, unsigned int sg_dma_len, int direction) 215 { 216 unsigned int i; 217 218 for (i = 0; i < sg_dma_len; ++i) { 219 ib_dma_sync_single_for_cpu(dev, 220 ib_sg_dma_address(dev, &sg[i]), 221 ib_sg_dma_len(dev, &sg[i]), 222 direction); 223 } 224 } 225 #define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu 226 227 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev, 228 struct scatterlist *sg, unsigned int sg_dma_len, int direction) 229 { 230 unsigned int i; 231 232 for (i = 0; i < sg_dma_len; ++i) { 233 ib_dma_sync_single_for_device(dev, 234 ib_sg_dma_address(dev, &sg[i]), 235 ib_sg_dma_len(dev, &sg[i]), 236 direction); 237 } 238 } 239 #define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device 240 241 242 /* ib.c */ 243 extern struct rds_transport rds_ib_transport; 244 extern void rds_ib_add_one(struct ib_device *device); 245 extern void rds_ib_remove_one(struct ib_device *device); 246 extern struct ib_client rds_ib_client; 247 248 extern unsigned int fmr_pool_size; 249 extern unsigned int fmr_message_size; 250 extern unsigned int rds_ib_retry_count; 251 252 extern spinlock_t ib_nodev_conns_lock; 253 extern struct list_head ib_nodev_conns; 254 255 /* ib_cm.c */ 256 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp); 257 void rds_ib_conn_free(void *arg); 258 int rds_ib_conn_connect(struct rds_connection *conn); 259 void rds_ib_conn_shutdown(struct rds_connection *conn); 260 void rds_ib_state_change(struct sock *sk); 261 int __init rds_ib_listen_init(void); 262 void rds_ib_listen_stop(void); 263 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...); 264 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id, 265 struct rdma_cm_event *event); 266 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id); 267 void rds_ib_cm_connect_complete(struct rds_connection *conn, 268 struct rdma_cm_event *event); 269 270 271 #define rds_ib_conn_error(conn, fmt...) \ 272 __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt) 273 274 /* ib_rdma.c */ 275 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr); 276 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn); 277 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn); 278 void __rds_ib_destroy_conns(struct list_head *list, spinlock_t *list_lock); 279 static inline void rds_ib_destroy_nodev_conns(void) 280 { 281 __rds_ib_destroy_conns(&ib_nodev_conns, &ib_nodev_conns_lock); 282 } 283 static inline void rds_ib_destroy_conns(struct rds_ib_device *rds_ibdev) 284 { 285 __rds_ib_destroy_conns(&rds_ibdev->conn_list, &rds_ibdev->spinlock); 286 } 287 struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *); 288 void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo); 289 void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *); 290 void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents, 291 struct rds_sock *rs, u32 *key_ret); 292 void rds_ib_sync_mr(void *trans_private, int dir); 293 void rds_ib_free_mr(void *trans_private, int invalidate); 294 void rds_ib_flush_mrs(void); 295 296 /* ib_recv.c */ 297 int __init rds_ib_recv_init(void); 298 void rds_ib_recv_exit(void); 299 int rds_ib_recv(struct rds_connection *conn); 300 int rds_ib_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp, 301 gfp_t page_gfp, int prefill); 302 void rds_ib_inc_purge(struct rds_incoming *inc); 303 void rds_ib_inc_free(struct rds_incoming *inc); 304 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov, 305 size_t size); 306 void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context); 307 void rds_ib_recv_tasklet_fn(unsigned long data); 308 void rds_ib_recv_init_ring(struct rds_ib_connection *ic); 309 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic); 310 void rds_ib_recv_init_ack(struct rds_ib_connection *ic); 311 void rds_ib_attempt_ack(struct rds_ib_connection *ic); 312 void rds_ib_ack_send_complete(struct rds_ib_connection *ic); 313 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic); 314 315 /* ib_ring.c */ 316 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr); 317 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr); 318 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos); 319 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val); 320 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val); 321 int rds_ib_ring_empty(struct rds_ib_work_ring *ring); 322 int rds_ib_ring_low(struct rds_ib_work_ring *ring); 323 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring); 324 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest); 325 extern wait_queue_head_t rds_ib_ring_empty_wait; 326 327 /* ib_send.c */ 328 void rds_ib_xmit_complete(struct rds_connection *conn); 329 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm, 330 unsigned int hdr_off, unsigned int sg, unsigned int off); 331 void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context); 332 void rds_ib_send_init_ring(struct rds_ib_connection *ic); 333 void rds_ib_send_clear_ring(struct rds_ib_connection *ic); 334 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rds_rdma_op *op); 335 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits); 336 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted); 337 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted, 338 u32 *adv_credits, int need_posted, int max_posted); 339 340 /* ib_stats.c */ 341 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats); 342 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member) 343 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter, 344 unsigned int avail); 345 346 /* ib_sysctl.c */ 347 int __init rds_ib_sysctl_init(void); 348 void rds_ib_sysctl_exit(void); 349 extern unsigned long rds_ib_sysctl_max_send_wr; 350 extern unsigned long rds_ib_sysctl_max_recv_wr; 351 extern unsigned long rds_ib_sysctl_max_unsig_wrs; 352 extern unsigned long rds_ib_sysctl_max_unsig_bytes; 353 extern unsigned long rds_ib_sysctl_max_recv_allocation; 354 extern unsigned int rds_ib_sysctl_flow_control; 355 extern ctl_table rds_ib_sysctl_table[]; 356 357 /* 358 * Helper functions for getting/setting the header and data SGEs in 359 * RDS packets (not RDMA) 360 * 361 * From version 3.1 onwards, header is in front of data in the sge. 362 */ 363 static inline struct ib_sge * 364 rds_ib_header_sge(struct rds_ib_connection *ic, struct ib_sge *sge) 365 { 366 if (ic->conn->c_version > RDS_PROTOCOL_3_0) 367 return &sge[0]; 368 else 369 return &sge[1]; 370 } 371 372 static inline struct ib_sge * 373 rds_ib_data_sge(struct rds_ib_connection *ic, struct ib_sge *sge) 374 { 375 if (ic->conn->c_version > RDS_PROTOCOL_3_0) 376 return &sge[1]; 377 else 378 return &sge[0]; 379 } 380 381 #endif 382