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_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */ 19 20 extern struct list_head rds_ib_devices; 21 22 /* 23 * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to 24 * try and minimize the amount of memory tied up both the device and 25 * socket receive queues. 26 */ 27 /* page offset of the final full frag that fits in the page */ 28 #define RDS_PAGE_LAST_OFF (((PAGE_SIZE / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE) 29 struct rds_page_frag { 30 struct list_head f_item; 31 struct page *f_page; 32 unsigned long f_offset; 33 dma_addr_t f_mapped; 34 }; 35 36 struct rds_ib_incoming { 37 struct list_head ii_frags; 38 struct rds_incoming ii_inc; 39 }; 40 41 struct rds_ib_connect_private { 42 /* Add new fields at the end, and don't permute existing fields. */ 43 __be32 dp_saddr; 44 __be32 dp_daddr; 45 u8 dp_protocol_major; 46 u8 dp_protocol_minor; 47 __be16 dp_protocol_minor_mask; /* bitmask */ 48 __be32 dp_reserved1; 49 __be64 dp_ack_seq; 50 __be32 dp_credit; /* non-zero enables flow ctl */ 51 }; 52 53 struct rds_ib_send_work { 54 struct rds_message *s_rm; 55 struct rds_rdma_op *s_op; 56 struct ib_send_wr s_wr; 57 struct ib_sge s_sge[RDS_IB_MAX_SGE]; 58 unsigned long s_queued; 59 }; 60 61 struct rds_ib_recv_work { 62 struct rds_ib_incoming *r_ibinc; 63 struct rds_page_frag *r_frag; 64 struct ib_recv_wr r_wr; 65 struct ib_sge r_sge[2]; 66 }; 67 68 struct rds_ib_work_ring { 69 u32 w_nr; 70 u32 w_alloc_ptr; 71 u32 w_alloc_ctr; 72 u32 w_free_ptr; 73 atomic_t w_free_ctr; 74 }; 75 76 struct rds_ib_device; 77 78 struct rds_ib_connection { 79 80 struct list_head ib_node; 81 struct rds_ib_device *rds_ibdev; 82 struct rds_connection *conn; 83 84 /* alphabet soup, IBTA style */ 85 struct rdma_cm_id *i_cm_id; 86 struct ib_pd *i_pd; 87 struct ib_mr *i_mr; 88 struct ib_cq *i_send_cq; 89 struct ib_cq *i_recv_cq; 90 91 /* tx */ 92 struct rds_ib_work_ring i_send_ring; 93 struct rds_message *i_rm; 94 struct rds_header *i_send_hdrs; 95 u64 i_send_hdrs_dma; 96 struct rds_ib_send_work *i_sends; 97 98 /* rx */ 99 struct mutex i_recv_mutex; 100 struct rds_ib_work_ring i_recv_ring; 101 struct rds_ib_incoming *i_ibinc; 102 u32 i_recv_data_rem; 103 struct rds_header *i_recv_hdrs; 104 u64 i_recv_hdrs_dma; 105 struct rds_ib_recv_work *i_recvs; 106 struct rds_page_frag i_frag; 107 u64 i_ack_recv; /* last ACK received */ 108 109 /* sending acks */ 110 unsigned long i_ack_flags; 111 u64 i_ack_next; /* next ACK to send */ 112 struct rds_header *i_ack; 113 struct ib_send_wr i_ack_wr; 114 struct ib_sge i_ack_sge; 115 u64 i_ack_dma; 116 unsigned long i_ack_queued; 117 118 /* Flow control related information 119 * 120 * Our algorithm uses a pair variables that we need to access 121 * atomically - one for the send credits, and one posted 122 * recv credits we need to transfer to remote. 123 * Rather than protect them using a slow spinlock, we put both into 124 * a single atomic_t and update it using cmpxchg 125 */ 126 atomic_t i_credits; 127 128 /* Protocol version specific information */ 129 unsigned int i_flowctl:1; /* enable/disable flow ctl */ 130 131 /* Batched completions */ 132 unsigned int i_unsignaled_wrs; 133 long i_unsignaled_bytes; 134 }; 135 136 /* This assumes that atomic_t is at least 32 bits */ 137 #define IB_GET_SEND_CREDITS(v) ((v) & 0xffff) 138 #define IB_GET_POST_CREDITS(v) ((v) >> 16) 139 #define IB_SET_SEND_CREDITS(v) ((v) & 0xffff) 140 #define IB_SET_POST_CREDITS(v) ((v) << 16) 141 142 struct rds_ib_ipaddr { 143 struct list_head list; 144 __be32 ipaddr; 145 }; 146 147 struct rds_ib_device { 148 struct list_head list; 149 struct list_head ipaddr_list; 150 struct list_head conn_list; 151 struct ib_device *dev; 152 struct ib_pd *pd; 153 struct ib_mr *mr; 154 struct rds_ib_mr_pool *mr_pool; 155 int fmr_page_shift; 156 int fmr_page_size; 157 u64 fmr_page_mask; 158 unsigned int fmr_max_remaps; 159 unsigned int max_fmrs; 160 int max_sge; 161 unsigned int max_wrs; 162 spinlock_t spinlock; /* protect the above */ 163 }; 164 165 /* bits for i_ack_flags */ 166 #define IB_ACK_IN_FLIGHT 0 167 #define IB_ACK_REQUESTED 1 168 169 /* Magic WR_ID for ACKs */ 170 #define RDS_IB_ACK_WR_ID (~(u64) 0) 171 172 struct rds_ib_statistics { 173 uint64_t s_ib_connect_raced; 174 uint64_t s_ib_listen_closed_stale; 175 uint64_t s_ib_tx_cq_call; 176 uint64_t s_ib_tx_cq_event; 177 uint64_t s_ib_tx_ring_full; 178 uint64_t s_ib_tx_throttle; 179 uint64_t s_ib_tx_sg_mapping_failure; 180 uint64_t s_ib_tx_stalled; 181 uint64_t s_ib_tx_credit_updates; 182 uint64_t s_ib_rx_cq_call; 183 uint64_t s_ib_rx_cq_event; 184 uint64_t s_ib_rx_ring_empty; 185 uint64_t s_ib_rx_refill_from_cq; 186 uint64_t s_ib_rx_refill_from_thread; 187 uint64_t s_ib_rx_alloc_limit; 188 uint64_t s_ib_rx_credit_updates; 189 uint64_t s_ib_ack_sent; 190 uint64_t s_ib_ack_send_failure; 191 uint64_t s_ib_ack_send_delayed; 192 uint64_t s_ib_ack_send_piggybacked; 193 uint64_t s_ib_ack_received; 194 uint64_t s_ib_rdma_mr_alloc; 195 uint64_t s_ib_rdma_mr_free; 196 uint64_t s_ib_rdma_mr_used; 197 uint64_t s_ib_rdma_mr_pool_flush; 198 uint64_t s_ib_rdma_mr_pool_wait; 199 uint64_t s_ib_rdma_mr_pool_depleted; 200 }; 201 202 extern struct workqueue_struct *rds_ib_wq; 203 204 /* 205 * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h 206 * doesn't define it. 207 */ 208 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev, 209 struct scatterlist *sg, unsigned int sg_dma_len, int direction) 210 { 211 unsigned int i; 212 213 for (i = 0; i < sg_dma_len; ++i) { 214 ib_dma_sync_single_for_cpu(dev, 215 ib_sg_dma_address(dev, &sg[i]), 216 ib_sg_dma_len(dev, &sg[i]), 217 direction); 218 } 219 } 220 #define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu 221 222 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev, 223 struct scatterlist *sg, unsigned int sg_dma_len, int direction) 224 { 225 unsigned int i; 226 227 for (i = 0; i < sg_dma_len; ++i) { 228 ib_dma_sync_single_for_device(dev, 229 ib_sg_dma_address(dev, &sg[i]), 230 ib_sg_dma_len(dev, &sg[i]), 231 direction); 232 } 233 } 234 #define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device 235 236 237 /* ib.c */ 238 extern struct rds_transport rds_ib_transport; 239 extern void rds_ib_add_one(struct ib_device *device); 240 extern void rds_ib_remove_one(struct ib_device *device); 241 extern struct ib_client rds_ib_client; 242 243 extern unsigned int fmr_pool_size; 244 extern unsigned int fmr_message_size; 245 246 extern spinlock_t ib_nodev_conns_lock; 247 extern struct list_head ib_nodev_conns; 248 249 /* ib_cm.c */ 250 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp); 251 void rds_ib_conn_free(void *arg); 252 int rds_ib_conn_connect(struct rds_connection *conn); 253 void rds_ib_conn_shutdown(struct rds_connection *conn); 254 void rds_ib_state_change(struct sock *sk); 255 int __init rds_ib_listen_init(void); 256 void rds_ib_listen_stop(void); 257 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...); 258 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id, 259 struct rdma_cm_event *event); 260 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id); 261 void rds_ib_cm_connect_complete(struct rds_connection *conn, 262 struct rdma_cm_event *event); 263 264 265 #define rds_ib_conn_error(conn, fmt...) \ 266 __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt) 267 268 /* ib_rdma.c */ 269 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr); 270 int rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn); 271 void rds_ib_remove_nodev_conns(void); 272 void rds_ib_remove_conns(struct rds_ib_device *rds_ibdev); 273 struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *); 274 void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo); 275 void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *); 276 void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents, 277 struct rds_sock *rs, u32 *key_ret); 278 void rds_ib_sync_mr(void *trans_private, int dir); 279 void rds_ib_free_mr(void *trans_private, int invalidate); 280 void rds_ib_flush_mrs(void); 281 282 /* ib_recv.c */ 283 int __init rds_ib_recv_init(void); 284 void rds_ib_recv_exit(void); 285 int rds_ib_recv(struct rds_connection *conn); 286 int rds_ib_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp, 287 gfp_t page_gfp, int prefill); 288 void rds_ib_inc_purge(struct rds_incoming *inc); 289 void rds_ib_inc_free(struct rds_incoming *inc); 290 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov, 291 size_t size); 292 void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context); 293 void rds_ib_recv_init_ring(struct rds_ib_connection *ic); 294 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic); 295 void rds_ib_recv_init_ack(struct rds_ib_connection *ic); 296 void rds_ib_attempt_ack(struct rds_ib_connection *ic); 297 void rds_ib_ack_send_complete(struct rds_ib_connection *ic); 298 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic); 299 300 /* ib_ring.c */ 301 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr); 302 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr); 303 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos); 304 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val); 305 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val); 306 int rds_ib_ring_empty(struct rds_ib_work_ring *ring); 307 int rds_ib_ring_low(struct rds_ib_work_ring *ring); 308 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring); 309 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest); 310 extern wait_queue_head_t rds_ib_ring_empty_wait; 311 312 /* ib_send.c */ 313 void rds_ib_xmit_complete(struct rds_connection *conn); 314 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm, 315 unsigned int hdr_off, unsigned int sg, unsigned int off); 316 void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context); 317 void rds_ib_send_init_ring(struct rds_ib_connection *ic); 318 void rds_ib_send_clear_ring(struct rds_ib_connection *ic); 319 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rds_rdma_op *op); 320 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits); 321 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted); 322 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted, 323 u32 *adv_credits, int need_posted); 324 325 /* ib_stats.c */ 326 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats); 327 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member) 328 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter, 329 unsigned int avail); 330 331 /* ib_sysctl.c */ 332 int __init rds_ib_sysctl_init(void); 333 void rds_ib_sysctl_exit(void); 334 extern unsigned long rds_ib_sysctl_max_send_wr; 335 extern unsigned long rds_ib_sysctl_max_recv_wr; 336 extern unsigned long rds_ib_sysctl_max_unsig_wrs; 337 extern unsigned long rds_ib_sysctl_max_unsig_bytes; 338 extern unsigned long rds_ib_sysctl_max_recv_allocation; 339 extern unsigned int rds_ib_sysctl_flow_control; 340 extern ctl_table rds_ib_sysctl_table[]; 341 342 /* 343 * Helper functions for getting/setting the header and data SGEs in 344 * RDS packets (not RDMA) 345 */ 346 static inline struct ib_sge * 347 rds_ib_header_sge(struct rds_ib_connection *ic, struct ib_sge *sge) 348 { 349 return &sge[0]; 350 } 351 352 static inline struct ib_sge * 353 rds_ib_data_sge(struct rds_ib_connection *ic, struct ib_sge *sge) 354 { 355 return &sge[1]; 356 } 357 358 static inline void rds_ib_set_64bit(u64 *ptr, u64 val) 359 { 360 #if BITS_PER_LONG == 64 361 *ptr = val; 362 #else 363 set_64bit(ptr, val); 364 #endif 365 } 366 367 #endif 368