4 #include <rdma/ib_verbs.h>
5 #include <rdma/rdma_cm.h>
6 #include <linux/interrupt.h>
8 #include <linux/slab.h>
10 #include "rdma_transport.h"
12 #define RDS_IB_MAX_SGE 8
13 #define RDS_IB_RECV_SGE 2
15 #define RDS_IB_DEFAULT_RECV_WR 1024
16 #define RDS_IB_DEFAULT_SEND_WR 256
18 #define RDS_IB_DEFAULT_RETRY_COUNT 2
20 #define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */
22 #define RDS_IB_RECYCLE_BATCH_COUNT 32
24 #define RDS_IB_WC_MAX 32
26 extern struct rw_semaphore rds_ib_devices_lock;
27 extern struct list_head rds_ib_devices;
30 * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
31 * try and minimize the amount of memory tied up both the device and
32 * socket receive queues.
34 struct rds_page_frag {
35 struct list_head f_item;
36 struct list_head f_cache_entry;
37 struct scatterlist f_sg;
40 struct rds_ib_incoming {
41 struct list_head ii_frags;
42 struct list_head ii_cache_entry;
43 struct rds_incoming ii_inc;
46 struct rds_ib_cache_head {
47 struct list_head *first;
51 struct rds_ib_refill_cache {
52 struct rds_ib_cache_head __percpu *percpu;
53 struct list_head *xfer;
54 struct list_head *ready;
57 struct rds_ib_connect_private {
58 /* Add new fields at the end, and don't permute existing fields. */
63 __be16 dp_protocol_minor_mask; /* bitmask */
66 __be32 dp_credit; /* non-zero enables flow ctl */
69 struct rds_ib_send_work {
72 struct ib_send_wr s_wr;
73 struct ib_rdma_wr s_rdma_wr;
74 struct ib_atomic_wr s_atomic_wr;
76 struct ib_sge s_sge[RDS_IB_MAX_SGE];
77 unsigned long s_queued;
80 struct rds_ib_recv_work {
81 struct rds_ib_incoming *r_ibinc;
82 struct rds_page_frag *r_frag;
83 struct ib_recv_wr r_wr;
84 struct ib_sge r_sge[2];
87 struct rds_ib_work_ring {
95 /* Rings are posted with all the allocations they'll need to queue the
96 * incoming message to the receiving socket so this can't fail.
97 * All fragments start with a header, so we can make sure we're not receiving
98 * garbage, and we can tell a small 8 byte fragment from an ACK frame.
100 struct rds_ib_ack_state {
103 unsigned int ack_required:1;
104 unsigned int ack_next_valid:1;
105 unsigned int ack_recv_valid:1;
109 struct rds_ib_device;
111 struct rds_ib_connection {
113 struct list_head ib_node;
114 struct rds_ib_device *rds_ibdev;
115 struct rds_connection *conn;
117 /* alphabet soup, IBTA style */
118 struct rdma_cm_id *i_cm_id;
120 struct ib_cq *i_send_cq;
121 struct ib_cq *i_recv_cq;
122 struct ib_wc i_send_wc[RDS_IB_WC_MAX];
123 struct ib_wc i_recv_wc[RDS_IB_WC_MAX];
125 /* interrupt handling */
126 struct tasklet_struct i_send_tasklet;
127 struct tasklet_struct i_recv_tasklet;
130 struct rds_ib_work_ring i_send_ring;
131 struct rm_data_op *i_data_op;
132 struct rds_header *i_send_hdrs;
134 struct rds_ib_send_work *i_sends;
135 atomic_t i_signaled_sends;
138 struct mutex i_recv_mutex;
139 struct rds_ib_work_ring i_recv_ring;
140 struct rds_ib_incoming *i_ibinc;
142 struct rds_header *i_recv_hdrs;
144 struct rds_ib_recv_work *i_recvs;
145 u64 i_ack_recv; /* last ACK received */
146 struct rds_ib_refill_cache i_cache_incs;
147 struct rds_ib_refill_cache i_cache_frags;
150 unsigned long i_ack_flags;
151 #ifdef KERNEL_HAS_ATOMIC64
152 atomic64_t i_ack_next; /* next ACK to send */
154 spinlock_t i_ack_lock; /* protect i_ack_next */
155 u64 i_ack_next; /* next ACK to send */
157 struct rds_header *i_ack;
158 struct ib_send_wr i_ack_wr;
159 struct ib_sge i_ack_sge;
161 unsigned long i_ack_queued;
163 /* Flow control related information
165 * Our algorithm uses a pair variables that we need to access
166 * atomically - one for the send credits, and one posted
167 * recv credits we need to transfer to remote.
168 * Rather than protect them using a slow spinlock, we put both into
169 * a single atomic_t and update it using cmpxchg
173 /* Protocol version specific information */
174 unsigned int i_flowctl:1; /* enable/disable flow ctl */
176 /* Batched completions */
177 unsigned int i_unsignaled_wrs;
180 /* This assumes that atomic_t is at least 32 bits */
181 #define IB_GET_SEND_CREDITS(v) ((v) & 0xffff)
182 #define IB_GET_POST_CREDITS(v) ((v) >> 16)
183 #define IB_SET_SEND_CREDITS(v) ((v) & 0xffff)
184 #define IB_SET_POST_CREDITS(v) ((v) << 16)
186 struct rds_ib_ipaddr {
187 struct list_head list;
197 struct rds_ib_device {
198 struct list_head list;
199 struct list_head ipaddr_list;
200 struct list_head conn_list;
201 struct ib_device *dev;
203 unsigned int max_mrs;
204 struct rds_ib_mr_pool *mr_1m_pool;
205 struct rds_ib_mr_pool *mr_8k_pool;
206 unsigned int fmr_max_remaps;
207 unsigned int max_8k_mrs;
208 unsigned int max_1m_mrs;
210 unsigned int max_wrs;
211 unsigned int max_initiator_depth;
212 unsigned int max_responder_resources;
213 spinlock_t spinlock; /* protect the above */
215 struct work_struct free_work;
218 #define ibdev_to_node(ibdev) dev_to_node(ibdev->dma_device)
219 #define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)
221 /* bits for i_ack_flags */
222 #define IB_ACK_IN_FLIGHT 0
223 #define IB_ACK_REQUESTED 1
225 /* Magic WR_ID for ACKs */
226 #define RDS_IB_ACK_WR_ID (~(u64) 0)
228 struct rds_ib_statistics {
229 uint64_t s_ib_connect_raced;
230 uint64_t s_ib_listen_closed_stale;
231 uint64_t s_ib_evt_handler_call;
232 uint64_t s_ib_tasklet_call;
233 uint64_t s_ib_tx_cq_event;
234 uint64_t s_ib_tx_ring_full;
235 uint64_t s_ib_tx_throttle;
236 uint64_t s_ib_tx_sg_mapping_failure;
237 uint64_t s_ib_tx_stalled;
238 uint64_t s_ib_tx_credit_updates;
239 uint64_t s_ib_rx_cq_event;
240 uint64_t s_ib_rx_ring_empty;
241 uint64_t s_ib_rx_refill_from_cq;
242 uint64_t s_ib_rx_refill_from_thread;
243 uint64_t s_ib_rx_alloc_limit;
244 uint64_t s_ib_rx_credit_updates;
245 uint64_t s_ib_ack_sent;
246 uint64_t s_ib_ack_send_failure;
247 uint64_t s_ib_ack_send_delayed;
248 uint64_t s_ib_ack_send_piggybacked;
249 uint64_t s_ib_ack_received;
250 uint64_t s_ib_rdma_mr_8k_alloc;
251 uint64_t s_ib_rdma_mr_8k_free;
252 uint64_t s_ib_rdma_mr_8k_used;
253 uint64_t s_ib_rdma_mr_8k_pool_flush;
254 uint64_t s_ib_rdma_mr_8k_pool_wait;
255 uint64_t s_ib_rdma_mr_8k_pool_depleted;
256 uint64_t s_ib_rdma_mr_1m_alloc;
257 uint64_t s_ib_rdma_mr_1m_free;
258 uint64_t s_ib_rdma_mr_1m_used;
259 uint64_t s_ib_rdma_mr_1m_pool_flush;
260 uint64_t s_ib_rdma_mr_1m_pool_wait;
261 uint64_t s_ib_rdma_mr_1m_pool_depleted;
262 uint64_t s_ib_atomic_cswp;
263 uint64_t s_ib_atomic_fadd;
266 extern struct workqueue_struct *rds_ib_wq;
269 * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
272 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
273 struct scatterlist *sglist,
274 unsigned int sg_dma_len,
277 struct scatterlist *sg;
280 for_each_sg(sglist, sg, sg_dma_len, i) {
281 ib_dma_sync_single_for_cpu(dev,
282 ib_sg_dma_address(dev, sg),
283 ib_sg_dma_len(dev, sg),
287 #define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu
289 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
290 struct scatterlist *sglist,
291 unsigned int sg_dma_len,
294 struct scatterlist *sg;
297 for_each_sg(sglist, sg, sg_dma_len, i) {
298 ib_dma_sync_single_for_device(dev,
299 ib_sg_dma_address(dev, sg),
300 ib_sg_dma_len(dev, sg),
304 #define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device
308 extern struct rds_transport rds_ib_transport;
309 struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device);
310 void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
311 extern struct ib_client rds_ib_client;
313 extern unsigned int rds_ib_retry_count;
315 extern spinlock_t ib_nodev_conns_lock;
316 extern struct list_head ib_nodev_conns;
319 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
320 void rds_ib_conn_free(void *arg);
321 int rds_ib_conn_connect(struct rds_connection *conn);
322 void rds_ib_conn_shutdown(struct rds_connection *conn);
323 void rds_ib_state_change(struct sock *sk);
324 int rds_ib_listen_init(void);
325 void rds_ib_listen_stop(void);
326 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
327 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
328 struct rdma_cm_event *event);
329 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
330 void rds_ib_cm_connect_complete(struct rds_connection *conn,
331 struct rdma_cm_event *event);
334 #define rds_ib_conn_error(conn, fmt...) \
335 __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
338 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
339 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
340 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
341 void rds_ib_destroy_nodev_conns(void);
344 int rds_ib_recv_init(void);
345 void rds_ib_recv_exit(void);
346 int rds_ib_recv(struct rds_connection *conn);
347 int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic);
348 void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
349 void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp);
350 void rds_ib_inc_free(struct rds_incoming *inc);
351 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
352 void rds_ib_recv_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc,
353 struct rds_ib_ack_state *state);
354 void rds_ib_recv_tasklet_fn(unsigned long data);
355 void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
356 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
357 void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
358 void rds_ib_attempt_ack(struct rds_ib_connection *ic);
359 void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
360 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
361 void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required);
364 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
365 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
366 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
367 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
368 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
369 int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
370 int rds_ib_ring_low(struct rds_ib_work_ring *ring);
371 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
372 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
373 extern wait_queue_head_t rds_ib_ring_empty_wait;
376 void rds_ib_xmit_complete(struct rds_connection *conn);
377 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
378 unsigned int hdr_off, unsigned int sg, unsigned int off);
379 void rds_ib_send_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
380 void rds_ib_send_init_ring(struct rds_ib_connection *ic);
381 void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
382 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
383 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
384 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
385 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
386 u32 *adv_credits, int need_posted, int max_posted);
387 int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
390 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
391 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
392 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
396 int rds_ib_sysctl_init(void);
397 void rds_ib_sysctl_exit(void);
398 extern unsigned long rds_ib_sysctl_max_send_wr;
399 extern unsigned long rds_ib_sysctl_max_recv_wr;
400 extern unsigned long rds_ib_sysctl_max_unsig_wrs;
401 extern unsigned long rds_ib_sysctl_max_unsig_bytes;
402 extern unsigned long rds_ib_sysctl_max_recv_allocation;
403 extern unsigned int rds_ib_sysctl_flow_control;