1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <rdma/ib_verbs.h>
6 #include <rdma/rdma_cm.h>
7 #include <linux/interrupt.h>
9 #include <linux/slab.h>
11 #include "rdma_transport.h"
13 #define RDS_IB_MAX_SGE 8
14 #define RDS_IB_RECV_SGE 2
16 #define RDS_IB_DEFAULT_RECV_WR 1024
17 #define RDS_IB_DEFAULT_SEND_WR 256
18 #define RDS_IB_DEFAULT_FR_WR 256
19 #define RDS_IB_DEFAULT_FR_INV_WR 256
21 #define RDS_IB_DEFAULT_RETRY_COUNT 1
23 #define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */
25 #define RDS_IB_RECYCLE_BATCH_COUNT 32
27 #define RDS_IB_WC_MAX 32
29 extern struct rw_semaphore rds_ib_devices_lock;
30 extern struct list_head rds_ib_devices;
33 * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
34 * try and minimize the amount of memory tied up both the device and
35 * socket receive queues.
37 struct rds_page_frag {
38 struct list_head f_item;
39 struct list_head f_cache_entry;
40 struct scatterlist f_sg;
43 struct rds_ib_incoming {
44 struct list_head ii_frags;
45 struct list_head ii_cache_entry;
46 struct rds_incoming ii_inc;
49 struct rds_ib_cache_head {
50 struct list_head *first;
54 struct rds_ib_refill_cache {
55 struct rds_ib_cache_head __percpu *percpu;
56 struct list_head *xfer;
57 struct list_head *ready;
60 /* This is the common structure for the IB private data exchange in setting up
61 * an RDS connection. The exchange is different for IPv4 and IPv6 connections.
62 * The reason is that the address size is different and the addresses
63 * exchanged are in the beginning of the structure. Hence it is not possible
64 * for interoperability if same structure is used.
66 struct rds_ib_conn_priv_cmn {
67 u8 ricpc_protocol_major;
68 u8 ricpc_protocol_minor;
69 __be16 ricpc_protocol_minor_mask; /* bitmask */
72 __be16 ripc_reserved2;
74 __be32 ricpc_credit; /* non-zero enables flow ctl */
77 struct rds_ib_connect_private {
78 /* Add new fields at the end, and don't permute existing fields. */
81 struct rds_ib_conn_priv_cmn dp_cmn;
84 struct rds6_ib_connect_private {
85 /* Add new fields at the end, and don't permute existing fields. */
86 struct in6_addr dp_saddr;
87 struct in6_addr dp_daddr;
88 struct rds_ib_conn_priv_cmn dp_cmn;
91 #define dp_protocol_major dp_cmn.ricpc_protocol_major
92 #define dp_protocol_minor dp_cmn.ricpc_protocol_minor
93 #define dp_protocol_minor_mask dp_cmn.ricpc_protocol_minor_mask
94 #define dp_ack_seq dp_cmn.ricpc_ack_seq
95 #define dp_credit dp_cmn.ricpc_credit
97 union rds_ib_conn_priv {
98 struct rds_ib_connect_private ricp_v4;
99 struct rds6_ib_connect_private ricp_v6;
102 struct rds_ib_send_work {
105 struct ib_send_wr s_wr;
106 struct ib_rdma_wr s_rdma_wr;
107 struct ib_atomic_wr s_atomic_wr;
109 struct ib_sge s_sge[RDS_IB_MAX_SGE];
110 unsigned long s_queued;
113 struct rds_ib_recv_work {
114 struct rds_ib_incoming *r_ibinc;
115 struct rds_page_frag *r_frag;
116 struct ib_recv_wr r_wr;
117 struct ib_sge r_sge[2];
120 struct rds_ib_work_ring {
128 /* Rings are posted with all the allocations they'll need to queue the
129 * incoming message to the receiving socket so this can't fail.
130 * All fragments start with a header, so we can make sure we're not receiving
131 * garbage, and we can tell a small 8 byte fragment from an ACK frame.
133 struct rds_ib_ack_state {
136 unsigned int ack_required:1;
137 unsigned int ack_next_valid:1;
138 unsigned int ack_recv_valid:1;
142 struct rds_ib_device;
144 struct rds_ib_connection {
146 struct list_head ib_node;
147 struct rds_ib_device *rds_ibdev;
148 struct rds_connection *conn;
150 /* alphabet soup, IBTA style */
151 struct rdma_cm_id *i_cm_id;
153 struct ib_cq *i_send_cq;
154 struct ib_cq *i_recv_cq;
155 struct ib_wc i_send_wc[RDS_IB_WC_MAX];
156 struct ib_wc i_recv_wc[RDS_IB_WC_MAX];
158 /* To control the number of wrs from fastreg */
159 atomic_t i_fastreg_wrs;
160 atomic_t i_fastunreg_wrs;
162 /* interrupt handling */
163 struct tasklet_struct i_send_tasklet;
164 struct tasklet_struct i_recv_tasklet;
167 struct rds_ib_work_ring i_send_ring;
168 struct rm_data_op *i_data_op;
169 struct rds_header *i_send_hdrs;
170 dma_addr_t i_send_hdrs_dma;
171 struct rds_ib_send_work *i_sends;
172 atomic_t i_signaled_sends;
175 struct mutex i_recv_mutex;
176 struct rds_ib_work_ring i_recv_ring;
177 struct rds_ib_incoming *i_ibinc;
179 struct rds_header *i_recv_hdrs;
180 dma_addr_t i_recv_hdrs_dma;
181 struct rds_ib_recv_work *i_recvs;
182 u64 i_ack_recv; /* last ACK received */
183 struct rds_ib_refill_cache i_cache_incs;
184 struct rds_ib_refill_cache i_cache_frags;
185 atomic_t i_cache_allocs;
188 unsigned long i_ack_flags;
189 #ifdef KERNEL_HAS_ATOMIC64
190 atomic64_t i_ack_next; /* next ACK to send */
192 spinlock_t i_ack_lock; /* protect i_ack_next */
193 u64 i_ack_next; /* next ACK to send */
195 struct rds_header *i_ack;
196 struct ib_send_wr i_ack_wr;
197 struct ib_sge i_ack_sge;
198 dma_addr_t i_ack_dma;
199 unsigned long i_ack_queued;
201 /* Flow control related information
203 * Our algorithm uses a pair variables that we need to access
204 * atomically - one for the send credits, and one posted
205 * recv credits we need to transfer to remote.
206 * Rather than protect them using a slow spinlock, we put both into
207 * a single atomic_t and update it using cmpxchg
211 /* Protocol version specific information */
212 unsigned int i_flowctl:1; /* enable/disable flow ctl */
214 /* Batched completions */
215 unsigned int i_unsignaled_wrs;
217 /* Endpoint role in connection */
219 atomic_t i_cq_quiesce;
221 /* Send/Recv vectors */
226 /* This assumes that atomic_t is at least 32 bits */
227 #define IB_GET_SEND_CREDITS(v) ((v) & 0xffff)
228 #define IB_GET_POST_CREDITS(v) ((v) >> 16)
229 #define IB_SET_SEND_CREDITS(v) ((v) & 0xffff)
230 #define IB_SET_POST_CREDITS(v) ((v) << 16)
232 struct rds_ib_ipaddr {
233 struct list_head list;
243 struct rds_ib_device {
244 struct list_head list;
245 struct list_head ipaddr_list;
246 struct list_head conn_list;
247 struct ib_device *dev;
251 unsigned int max_mrs;
252 struct rds_ib_mr_pool *mr_1m_pool;
253 struct rds_ib_mr_pool *mr_8k_pool;
254 unsigned int fmr_max_remaps;
255 unsigned int max_8k_mrs;
256 unsigned int max_1m_mrs;
258 unsigned int max_wrs;
259 unsigned int max_initiator_depth;
260 unsigned int max_responder_resources;
261 spinlock_t spinlock; /* protect the above */
263 struct work_struct free_work;
267 #define ibdev_to_node(ibdev) dev_to_node((ibdev)->dev.parent)
268 #define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)
270 /* bits for i_ack_flags */
271 #define IB_ACK_IN_FLIGHT 0
272 #define IB_ACK_REQUESTED 1
274 /* Magic WR_ID for ACKs */
275 #define RDS_IB_ACK_WR_ID (~(u64) 0)
277 struct rds_ib_statistics {
278 uint64_t s_ib_connect_raced;
279 uint64_t s_ib_listen_closed_stale;
280 uint64_t s_ib_evt_handler_call;
281 uint64_t s_ib_tasklet_call;
282 uint64_t s_ib_tx_cq_event;
283 uint64_t s_ib_tx_ring_full;
284 uint64_t s_ib_tx_throttle;
285 uint64_t s_ib_tx_sg_mapping_failure;
286 uint64_t s_ib_tx_stalled;
287 uint64_t s_ib_tx_credit_updates;
288 uint64_t s_ib_rx_cq_event;
289 uint64_t s_ib_rx_ring_empty;
290 uint64_t s_ib_rx_refill_from_cq;
291 uint64_t s_ib_rx_refill_from_thread;
292 uint64_t s_ib_rx_alloc_limit;
293 uint64_t s_ib_rx_total_frags;
294 uint64_t s_ib_rx_total_incs;
295 uint64_t s_ib_rx_credit_updates;
296 uint64_t s_ib_ack_sent;
297 uint64_t s_ib_ack_send_failure;
298 uint64_t s_ib_ack_send_delayed;
299 uint64_t s_ib_ack_send_piggybacked;
300 uint64_t s_ib_ack_received;
301 uint64_t s_ib_rdma_mr_8k_alloc;
302 uint64_t s_ib_rdma_mr_8k_free;
303 uint64_t s_ib_rdma_mr_8k_used;
304 uint64_t s_ib_rdma_mr_8k_pool_flush;
305 uint64_t s_ib_rdma_mr_8k_pool_wait;
306 uint64_t s_ib_rdma_mr_8k_pool_depleted;
307 uint64_t s_ib_rdma_mr_1m_alloc;
308 uint64_t s_ib_rdma_mr_1m_free;
309 uint64_t s_ib_rdma_mr_1m_used;
310 uint64_t s_ib_rdma_mr_1m_pool_flush;
311 uint64_t s_ib_rdma_mr_1m_pool_wait;
312 uint64_t s_ib_rdma_mr_1m_pool_depleted;
313 uint64_t s_ib_rdma_mr_8k_reused;
314 uint64_t s_ib_rdma_mr_1m_reused;
315 uint64_t s_ib_atomic_cswp;
316 uint64_t s_ib_atomic_fadd;
317 uint64_t s_ib_recv_added_to_cache;
318 uint64_t s_ib_recv_removed_from_cache;
321 extern struct workqueue_struct *rds_ib_wq;
324 * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
327 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
328 struct scatterlist *sglist,
329 unsigned int sg_dma_len,
332 struct scatterlist *sg;
335 for_each_sg(sglist, sg, sg_dma_len, i) {
336 ib_dma_sync_single_for_cpu(dev, sg_dma_address(sg),
337 sg_dma_len(sg), direction);
340 #define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu
342 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
343 struct scatterlist *sglist,
344 unsigned int sg_dma_len,
347 struct scatterlist *sg;
350 for_each_sg(sglist, sg, sg_dma_len, i) {
351 ib_dma_sync_single_for_device(dev, sg_dma_address(sg),
352 sg_dma_len(sg), direction);
355 #define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device
359 extern struct rds_transport rds_ib_transport;
360 struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device);
361 void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
362 extern struct ib_client rds_ib_client;
364 extern unsigned int rds_ib_retry_count;
366 extern spinlock_t ib_nodev_conns_lock;
367 extern struct list_head ib_nodev_conns;
370 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
371 void rds_ib_conn_free(void *arg);
372 int rds_ib_conn_path_connect(struct rds_conn_path *cp);
373 void rds_ib_conn_path_shutdown(struct rds_conn_path *cp);
374 void rds_ib_state_change(struct sock *sk);
375 int rds_ib_listen_init(void);
376 void rds_ib_listen_stop(void);
378 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
379 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
380 struct rdma_cm_event *event, bool isv6);
381 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id, bool isv6);
382 void rds_ib_cm_connect_complete(struct rds_connection *conn,
383 struct rdma_cm_event *event);
386 #define rds_ib_conn_error(conn, fmt...) \
387 __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
390 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev,
391 struct in6_addr *ipaddr);
392 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
393 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
394 void rds_ib_destroy_nodev_conns(void);
395 void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
398 int rds_ib_recv_init(void);
399 void rds_ib_recv_exit(void);
400 int rds_ib_recv_path(struct rds_conn_path *conn);
401 int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic, gfp_t gfp);
402 void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
403 void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp);
404 void rds_ib_inc_free(struct rds_incoming *inc);
405 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
406 void rds_ib_recv_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc,
407 struct rds_ib_ack_state *state);
408 void rds_ib_recv_tasklet_fn(unsigned long data);
409 void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
410 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
411 void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
412 void rds_ib_attempt_ack(struct rds_ib_connection *ic);
413 void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
414 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
415 void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required);
418 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
419 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
420 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
421 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
422 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
423 int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
424 int rds_ib_ring_low(struct rds_ib_work_ring *ring);
425 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
426 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
427 extern wait_queue_head_t rds_ib_ring_empty_wait;
430 void rds_ib_xmit_path_complete(struct rds_conn_path *cp);
431 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
432 unsigned int hdr_off, unsigned int sg, unsigned int off);
433 void rds_ib_send_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
434 void rds_ib_send_init_ring(struct rds_ib_connection *ic);
435 void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
436 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
437 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
438 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
439 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
440 u32 *adv_credits, int need_posted, int max_posted);
441 int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
444 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_ib_statistics, rds_ib_stats);
445 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
446 #define rds_ib_stats_add(member, count) \
447 rds_stats_add_which(rds_ib_stats, member, count)
448 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
452 int rds_ib_sysctl_init(void);
453 void rds_ib_sysctl_exit(void);
454 extern unsigned long rds_ib_sysctl_max_send_wr;
455 extern unsigned long rds_ib_sysctl_max_recv_wr;
456 extern unsigned long rds_ib_sysctl_max_unsig_wrs;
457 extern unsigned long rds_ib_sysctl_max_unsig_bytes;
458 extern unsigned long rds_ib_sysctl_max_recv_allocation;
459 extern unsigned int rds_ib_sysctl_flow_control;