4 #include <rdma/ib_verbs.h>
5 #include <rdma/rdma_cm.h>
7 #include <linux/slab.h>
9 #include "rdma_transport.h"
11 #define RDS_FMR_SIZE 256
12 #define RDS_FMR_POOL_SIZE 4096
14 #define RDS_IB_MAX_SGE 8
15 #define RDS_IB_RECV_SGE 2
17 #define RDS_IB_DEFAULT_RECV_WR 1024
18 #define RDS_IB_DEFAULT_SEND_WR 256
20 #define RDS_IB_DEFAULT_RETRY_COUNT 2
22 #define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */
24 extern struct list_head rds_ib_devices
;
27 * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
28 * try and minimize the amount of memory tied up both the device and
29 * socket receive queues.
31 /* page offset of the final full frag that fits in the page */
32 #define RDS_PAGE_LAST_OFF (((PAGE_SIZE / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE)
33 struct rds_page_frag
{
34 struct list_head f_item
;
36 unsigned long f_offset
;
40 struct rds_ib_incoming
{
41 struct list_head ii_frags
;
42 struct rds_incoming ii_inc
;
45 struct rds_ib_connect_private
{
46 /* Add new fields at the end, and don't permute existing fields. */
51 __be16 dp_protocol_minor_mask
; /* bitmask */
54 __be32 dp_credit
; /* non-zero enables flow ctl */
57 struct rds_ib_send_work
{
59 struct ib_send_wr s_wr
;
60 struct ib_sge s_sge
[RDS_IB_MAX_SGE
];
61 unsigned long s_queued
;
64 struct rds_ib_recv_work
{
65 struct rds_ib_incoming
*r_ibinc
;
66 struct rds_page_frag
*r_frag
;
67 struct ib_recv_wr r_wr
;
68 struct ib_sge r_sge
[2];
71 struct rds_ib_work_ring
{
81 struct rds_ib_connection
{
83 struct list_head ib_node
;
84 struct rds_ib_device
*rds_ibdev
;
85 struct rds_connection
*conn
;
87 /* alphabet soup, IBTA style */
88 struct rdma_cm_id
*i_cm_id
;
91 struct ib_cq
*i_send_cq
;
92 struct ib_cq
*i_recv_cq
;
95 struct rds_ib_work_ring i_send_ring
;
96 struct rm_data_op
*i_data_op
;
97 struct rds_header
*i_send_hdrs
;
99 struct rds_ib_send_work
*i_sends
;
102 struct tasklet_struct i_recv_tasklet
;
103 struct mutex i_recv_mutex
;
104 struct rds_ib_work_ring i_recv_ring
;
105 struct rds_ib_incoming
*i_ibinc
;
107 struct rds_header
*i_recv_hdrs
;
109 struct rds_ib_recv_work
*i_recvs
;
110 struct rds_page_frag i_frag
;
111 u64 i_ack_recv
; /* last ACK received */
114 unsigned long i_ack_flags
;
115 #ifdef KERNEL_HAS_ATOMIC64
116 atomic64_t i_ack_next
; /* next ACK to send */
118 spinlock_t i_ack_lock
; /* protect i_ack_next */
119 u64 i_ack_next
; /* next ACK to send */
121 struct rds_header
*i_ack
;
122 struct ib_send_wr i_ack_wr
;
123 struct ib_sge i_ack_sge
;
125 unsigned long i_ack_queued
;
127 /* Flow control related information
129 * Our algorithm uses a pair variables that we need to access
130 * atomically - one for the send credits, and one posted
131 * recv credits we need to transfer to remote.
132 * Rather than protect them using a slow spinlock, we put both into
133 * a single atomic_t and update it using cmpxchg
137 /* Protocol version specific information */
138 unsigned int i_flowctl
:1; /* enable/disable flow ctl */
140 /* Batched completions */
141 unsigned int i_unsignaled_wrs
;
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)
150 struct rds_ib_ipaddr
{
151 struct list_head list
;
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
;
162 struct rds_ib_mr_pool
*mr_pool
;
163 unsigned int fmr_max_remaps
;
164 unsigned int max_fmrs
;
166 unsigned int max_wrs
;
167 unsigned int max_initiator_depth
;
168 unsigned int max_responder_resources
;
169 spinlock_t spinlock
; /* protect the above */
172 #define pcidev_to_node(pcidev) pcibus_to_node(pcidev->bus)
173 #define ibdev_to_node(ibdev) pcidev_to_node(to_pci_dev(ibdev->dma_device))
174 #define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)
176 /* bits for i_ack_flags */
177 #define IB_ACK_IN_FLIGHT 0
178 #define IB_ACK_REQUESTED 1
180 /* Magic WR_ID for ACKs */
181 #define RDS_IB_ACK_WR_ID (~(u64) 0)
183 struct rds_ib_statistics
{
184 uint64_t s_ib_connect_raced
;
185 uint64_t s_ib_listen_closed_stale
;
186 uint64_t s_ib_tx_cq_call
;
187 uint64_t s_ib_tx_cq_event
;
188 uint64_t s_ib_tx_ring_full
;
189 uint64_t s_ib_tx_throttle
;
190 uint64_t s_ib_tx_sg_mapping_failure
;
191 uint64_t s_ib_tx_stalled
;
192 uint64_t s_ib_tx_credit_updates
;
193 uint64_t s_ib_rx_cq_call
;
194 uint64_t s_ib_rx_cq_event
;
195 uint64_t s_ib_rx_ring_empty
;
196 uint64_t s_ib_rx_refill_from_cq
;
197 uint64_t s_ib_rx_refill_from_thread
;
198 uint64_t s_ib_rx_alloc_limit
;
199 uint64_t s_ib_rx_credit_updates
;
200 uint64_t s_ib_ack_sent
;
201 uint64_t s_ib_ack_send_failure
;
202 uint64_t s_ib_ack_send_delayed
;
203 uint64_t s_ib_ack_send_piggybacked
;
204 uint64_t s_ib_ack_received
;
205 uint64_t s_ib_rdma_mr_alloc
;
206 uint64_t s_ib_rdma_mr_free
;
207 uint64_t s_ib_rdma_mr_used
;
208 uint64_t s_ib_rdma_mr_pool_flush
;
209 uint64_t s_ib_rdma_mr_pool_wait
;
210 uint64_t s_ib_rdma_mr_pool_depleted
;
211 uint64_t s_ib_atomic_cswp
;
212 uint64_t s_ib_atomic_fadd
;
215 extern struct workqueue_struct
*rds_ib_wq
;
218 * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
221 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device
*dev
,
222 struct scatterlist
*sg
, unsigned int sg_dma_len
, int direction
)
226 for (i
= 0; i
< sg_dma_len
; ++i
) {
227 ib_dma_sync_single_for_cpu(dev
,
228 ib_sg_dma_address(dev
, &sg
[i
]),
229 ib_sg_dma_len(dev
, &sg
[i
]),
233 #define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu
235 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device
*dev
,
236 struct scatterlist
*sg
, unsigned int sg_dma_len
, int direction
)
240 for (i
= 0; i
< sg_dma_len
; ++i
) {
241 ib_dma_sync_single_for_device(dev
,
242 ib_sg_dma_address(dev
, &sg
[i
]),
243 ib_sg_dma_len(dev
, &sg
[i
]),
247 #define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device
251 extern struct rds_transport rds_ib_transport
;
252 extern void rds_ib_add_one(struct ib_device
*device
);
253 extern void rds_ib_remove_one(struct ib_device
*device
);
254 extern struct ib_client rds_ib_client
;
256 extern unsigned int fmr_pool_size
;
257 extern unsigned int fmr_message_size
;
258 extern unsigned int rds_ib_retry_count
;
260 extern spinlock_t ib_nodev_conns_lock
;
261 extern struct list_head ib_nodev_conns
;
264 int rds_ib_conn_alloc(struct rds_connection
*conn
, gfp_t gfp
);
265 void rds_ib_conn_free(void *arg
);
266 int rds_ib_conn_connect(struct rds_connection
*conn
);
267 void rds_ib_conn_shutdown(struct rds_connection
*conn
);
268 void rds_ib_state_change(struct sock
*sk
);
269 int __init
rds_ib_listen_init(void);
270 void rds_ib_listen_stop(void);
271 void __rds_ib_conn_error(struct rds_connection
*conn
, const char *, ...);
272 int rds_ib_cm_handle_connect(struct rdma_cm_id
*cm_id
,
273 struct rdma_cm_event
*event
);
274 int rds_ib_cm_initiate_connect(struct rdma_cm_id
*cm_id
);
275 void rds_ib_cm_connect_complete(struct rds_connection
*conn
,
276 struct rdma_cm_event
*event
);
279 #define rds_ib_conn_error(conn, fmt...) \
280 __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
283 int rds_ib_update_ipaddr(struct rds_ib_device
*rds_ibdev
, __be32 ipaddr
);
284 void rds_ib_add_conn(struct rds_ib_device
*rds_ibdev
, struct rds_connection
*conn
);
285 void rds_ib_remove_conn(struct rds_ib_device
*rds_ibdev
, struct rds_connection
*conn
);
286 void __rds_ib_destroy_conns(struct list_head
*list
, spinlock_t
*list_lock
);
287 static inline void rds_ib_destroy_nodev_conns(void)
289 __rds_ib_destroy_conns(&ib_nodev_conns
, &ib_nodev_conns_lock
);
291 static inline void rds_ib_destroy_conns(struct rds_ib_device
*rds_ibdev
)
293 __rds_ib_destroy_conns(&rds_ibdev
->conn_list
, &rds_ibdev
->spinlock
);
295 struct rds_ib_mr_pool
*rds_ib_create_mr_pool(struct rds_ib_device
*);
296 void rds_ib_get_mr_info(struct rds_ib_device
*rds_ibdev
, struct rds_info_rdma_connection
*iinfo
);
297 void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool
*);
298 void *rds_ib_get_mr(struct scatterlist
*sg
, unsigned long nents
,
299 struct rds_sock
*rs
, u32
*key_ret
);
300 void rds_ib_sync_mr(void *trans_private
, int dir
);
301 void rds_ib_free_mr(void *trans_private
, int invalidate
);
302 void rds_ib_flush_mrs(void);
305 int __init
rds_ib_recv_init(void);
306 void rds_ib_recv_exit(void);
307 int rds_ib_recv(struct rds_connection
*conn
);
308 int rds_ib_recv_refill(struct rds_connection
*conn
, int prefill
);
309 void rds_ib_inc_free(struct rds_incoming
*inc
);
310 int rds_ib_inc_copy_to_user(struct rds_incoming
*inc
, struct iovec
*iov
,
312 void rds_ib_recv_cq_comp_handler(struct ib_cq
*cq
, void *context
);
313 void rds_ib_recv_tasklet_fn(unsigned long data
);
314 void rds_ib_recv_init_ring(struct rds_ib_connection
*ic
);
315 void rds_ib_recv_clear_ring(struct rds_ib_connection
*ic
);
316 void rds_ib_recv_init_ack(struct rds_ib_connection
*ic
);
317 void rds_ib_attempt_ack(struct rds_ib_connection
*ic
);
318 void rds_ib_ack_send_complete(struct rds_ib_connection
*ic
);
319 u64
rds_ib_piggyb_ack(struct rds_ib_connection
*ic
);
322 void rds_ib_ring_init(struct rds_ib_work_ring
*ring
, u32 nr
);
323 void rds_ib_ring_resize(struct rds_ib_work_ring
*ring
, u32 nr
);
324 u32
rds_ib_ring_alloc(struct rds_ib_work_ring
*ring
, u32 val
, u32
*pos
);
325 void rds_ib_ring_free(struct rds_ib_work_ring
*ring
, u32 val
);
326 void rds_ib_ring_unalloc(struct rds_ib_work_ring
*ring
, u32 val
);
327 int rds_ib_ring_empty(struct rds_ib_work_ring
*ring
);
328 int rds_ib_ring_low(struct rds_ib_work_ring
*ring
);
329 u32
rds_ib_ring_oldest(struct rds_ib_work_ring
*ring
);
330 u32
rds_ib_ring_completed(struct rds_ib_work_ring
*ring
, u32 wr_id
, u32 oldest
);
331 extern wait_queue_head_t rds_ib_ring_empty_wait
;
334 void rds_ib_xmit_complete(struct rds_connection
*conn
);
335 int rds_ib_xmit(struct rds_connection
*conn
, struct rds_message
*rm
,
336 unsigned int hdr_off
, unsigned int sg
, unsigned int off
);
337 void rds_ib_send_cq_comp_handler(struct ib_cq
*cq
, void *context
);
338 void rds_ib_send_init_ring(struct rds_ib_connection
*ic
);
339 void rds_ib_send_clear_ring(struct rds_ib_connection
*ic
);
340 int rds_ib_xmit_rdma(struct rds_connection
*conn
, struct rm_rdma_op
*op
);
341 void rds_ib_send_add_credits(struct rds_connection
*conn
, unsigned int credits
);
342 void rds_ib_advertise_credits(struct rds_connection
*conn
, unsigned int posted
);
343 int rds_ib_send_grab_credits(struct rds_ib_connection
*ic
, u32 wanted
,
344 u32
*adv_credits
, int need_posted
, int max_posted
);
345 int rds_ib_xmit_atomic(struct rds_connection
*conn
, struct rm_atomic_op
*op
);
348 DECLARE_PER_CPU(struct rds_ib_statistics
, rds_ib_stats
);
349 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
350 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator
*iter
,
354 int __init
rds_ib_sysctl_init(void);
355 void rds_ib_sysctl_exit(void);
356 extern unsigned long rds_ib_sysctl_max_send_wr
;
357 extern unsigned long rds_ib_sysctl_max_recv_wr
;
358 extern unsigned long rds_ib_sysctl_max_unsig_wrs
;
359 extern unsigned long rds_ib_sysctl_max_unsig_bytes
;
360 extern unsigned long rds_ib_sysctl_max_recv_allocation
;
361 extern unsigned int rds_ib_sysctl_flow_control
;
362 extern ctl_table rds_ib_sysctl_table
[];