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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/net/sunrpc/xprtrdma/svc_rdma_backchannel.c
..
..
@@ -5,100 +5,58 @@
5
5
  * Support for backward direction RPCs on RPC/RDMA (server-side).
6
6
  */
7
7
 
8
-#include <linux/module.h>
9
-
10
8
 #include <linux/sunrpc/svc_rdma.h>
11
9
 
12
10
 #include "xprt_rdma.h"
13
11
 #include <trace/events/rpcrdma.h>
14
12
 
15
-#define RPCDBG_FACILITY	RPCDBG_SVCXPRT
16
-
17
-#undef SVCRDMA_BACKCHANNEL_DEBUG
18
-
19
13
 /**
20
- * svc_rdma_handle_bc_reply - Process incoming backchannel reply
21
- * @xprt: controlling backchannel transport
22
- * @rdma_resp: pointer to incoming transport header
23
- * @rcvbuf: XDR buffer into which to decode the reply
14
+ * svc_rdma_handle_bc_reply - Process incoming backchannel Reply
15
+ * @rqstp: resources for handling the Reply
16
+ * @rctxt: Received message
24
17
  *
25
- * Returns:
26
- *	%0 if @rcvbuf is filled in, xprt_complete_rqst called,
27
- *	%-EAGAIN if server should call ->recvfrom again.
28
18
  */
29
-int svc_rdma_handle_bc_reply(struct rpc_xprt *xprt, __be32 *rdma_resp,
30
-			     struct xdr_buf *rcvbuf)
19
+void svc_rdma_handle_bc_reply(struct svc_rqst *rqstp,
20
+			      struct svc_rdma_recv_ctxt *rctxt)
31
21
 {
22
+	struct svc_xprt *sxprt = rqstp->rq_xprt;
23
+	struct rpc_xprt *xprt = sxprt->xpt_bc_xprt;
32
24
 	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
25
+	struct xdr_buf *rcvbuf = &rqstp->rq_arg;
33
26
 	struct kvec *dst, *src = &rcvbuf->head[0];
27
+	__be32 *rdma_resp = rctxt->rc_recv_buf;
34
28
 	struct rpc_rqst *req;
35
-	unsigned long cwnd;
36
29
 	u32 credits;
37
-	size_t len;
38
-	__be32 xid;
39
-	__be32 *p;
40
-	int ret;
41
30
 
42
-	p = (__be32 *)src->iov_base;
43
-	len = src->iov_len;
44
-	xid = *rdma_resp;
45
-
46
-#ifdef SVCRDMA_BACKCHANNEL_DEBUG
47
-	pr_info("%s: xid=%08x, length=%zu\n",
48
-		__func__, be32_to_cpu(xid), len);
49
-	pr_info("%s: RPC/RDMA: %*ph\n",
50
-		__func__, (int)RPCRDMA_HDRLEN_MIN, rdma_resp);
51
-	pr_info("%s:      RPC: %*ph\n",
52
-		__func__, (int)len, p);
53
-#endif
54
-
55
-	ret = -EAGAIN;
56
-	if (src->iov_len < 24)
57
-		goto out_shortreply;
58
-
59
-	spin_lock(&xprt->recv_lock);
60
-	req = xprt_lookup_rqst(xprt, xid);
31
+	spin_lock(&xprt->queue_lock);
32
+	req = xprt_lookup_rqst(xprt, *rdma_resp);
61
33
 	if (!req)
62
-		goto out_notfound;
34
+		goto out_unlock;
63
35
 
64
36
 	dst = &req->rq_private_buf.head[0];
65
37
 	memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf));
66
-	if (dst->iov_len < len)
38
+	if (dst->iov_len < src->iov_len)
67
39
 		goto out_unlock;
68
-	memcpy(dst->iov_base, p, len);
40
+	memcpy(dst->iov_base, src->iov_base, src->iov_len);
41
+	xprt_pin_rqst(req);
42
+	spin_unlock(&xprt->queue_lock);
69
43
 
70
44
 	credits = be32_to_cpup(rdma_resp + 2);
71
45
 	if (credits == 0)
72
46
 		credits = 1;	/* don't deadlock */
73
47
 	else if (credits > r_xprt->rx_buf.rb_bc_max_requests)
74
48
 		credits = r_xprt->rx_buf.rb_bc_max_requests;
75
-
76
-	spin_lock_bh(&xprt->transport_lock);
77
-	cwnd = xprt->cwnd;
49
+	spin_lock(&xprt->transport_lock);
78
50
 	xprt->cwnd = credits << RPC_CWNDSHIFT;
79
-	if (xprt->cwnd > cwnd)
80
-		xprt_release_rqst_cong(req->rq_task);
81
-	spin_unlock_bh(&xprt->transport_lock);
51
+	spin_unlock(&xprt->transport_lock);
82
52
 
83
-
84
-	ret = 0;
53
+	spin_lock(&xprt->queue_lock);
85
54
 	xprt_complete_rqst(req->rq_task, rcvbuf->len);
55
+	xprt_unpin_rqst(req);
86
56
 	rcvbuf->len = 0;
87
57
 
88
58
 out_unlock:
89
-	spin_unlock(&xprt->recv_lock);
90
-out:
91
-	return ret;
92
-
93
-out_shortreply:
94
-	dprintk("svcrdma: short bc reply: xprt=%p, len=%zu\n",
95
-		xprt, src->iov_len);
96
-	goto out;
97
-
98
-out_notfound:
99
-	dprintk("svcrdma: unrecognized bc reply: xprt=%p, xid=%08x\n",
100
-		xprt, be32_to_cpu(xid));
101
-	goto out_unlock;
59
+	spin_unlock(&xprt->queue_lock);
102
60
 }
103
61
 
104
62
 /* Send a backwards direction RPC call.
..
..
@@ -120,7 +78,7 @@
120
78
 {
121
79
 	int ret;
122
80
 
123
-	ret = svc_rdma_map_reply_msg(rdma, ctxt, &rqst->rq_snd_buf, NULL);
81
+	ret = svc_rdma_map_reply_msg(rdma, ctxt, NULL, &rqst->rq_snd_buf);
124
82
 	if (ret < 0)
125
83
 		return -EIO;
126
84
 
..
..
@@ -129,7 +87,7 @@
129
87
 	 */
130
88
 	get_page(virt_to_page(rqst->rq_buffer));
131
89
 	ctxt->sc_send_wr.opcode = IB_WR_SEND;
132
-	return svc_rdma_send(rdma, &ctxt->sc_send_wr);
90
+	return svc_rdma_send(rdma, ctxt);
133
91
 }
134
92
 
135
93
 /* Server-side transport endpoint wants a whole page for its send
..
..
@@ -184,7 +142,9 @@
184
142
 	if (!ctxt)
185
143
 		goto drop_connection;
186
144
 
187
-	p = ctxt->sc_xprt_buf;
145
+	p = xdr_reserve_space(&ctxt->sc_stream, RPCRDMA_HDRLEN_MIN);
146
+	if (!p)
147
+		goto put_ctxt;
188
148
 	*p++ = rqst->rq_xid;
189
149
 	*p++ = rpcrdma_version;
190
150
 	*p++ = cpu_to_be32(r_xprt->rx_buf.rb_bc_max_requests);
..
..
@@ -192,73 +152,56 @@
192
152
 	*p++ = xdr_zero;
193
153
 	*p++ = xdr_zero;
194
154
 	*p   = xdr_zero;
195
-	svc_rdma_sync_reply_hdr(rdma, ctxt, RPCRDMA_HDRLEN_MIN);
196
155
 
197
-#ifdef SVCRDMA_BACKCHANNEL_DEBUG
198
-	pr_info("%s: %*ph\n", __func__, 64, rqst->rq_buffer);
199
-#endif
200
-
156
+	rqst->rq_xtime = ktime_get();
201
157
 	rc = svc_rdma_bc_sendto(rdma, rqst, ctxt);
202
-	if (rc) {
203
-		svc_rdma_send_ctxt_put(rdma, ctxt);
204
-		goto drop_connection;
205
-	}
206
-	return rc;
158
+	if (rc)
159
+		goto put_ctxt;
160
+	return 0;
161
+
162
+put_ctxt:
163
+	svc_rdma_send_ctxt_put(rdma, ctxt);
207
164
 
208
165
 drop_connection:
209
-	dprintk("svcrdma: failed to send bc call\n");
210
-	xprt_disconnect_done(xprt);
211
166
 	return -ENOTCONN;
212
167
 }
213
168
 
214
-/* Send an RPC call on the passive end of a transport
215
- * connection.
169
+/**
170
+ * xprt_rdma_bc_send_request - Send a reverse-direction Call
171
+ * @rqst: rpc_rqst containing Call message to be sent
172
+ *
173
+ * Return values:
174
+ *   %0 if the message was sent successfully
175
+ *   %ENOTCONN if the message was not sent
216
176
  */
217
-static int
218
-xprt_rdma_bc_send_request(struct rpc_task *task)
177
+static int xprt_rdma_bc_send_request(struct rpc_rqst *rqst)
219
178
 {
220
-	struct rpc_rqst *rqst = task->tk_rqstp;
221
179
 	struct svc_xprt *sxprt = rqst->rq_xprt->bc_xprt;
222
-	struct svcxprt_rdma *rdma;
180
+	struct svcxprt_rdma *rdma =
181
+		container_of(sxprt, struct svcxprt_rdma, sc_xprt);
223
182
 	int ret;
224
183
 
225
-	dprintk("svcrdma: sending bc call with xid: %08x\n",
226
-		be32_to_cpu(rqst->rq_xid));
184
+	if (test_bit(XPT_DEAD, &sxprt->xpt_flags))
185
+		return -ENOTCONN;
227
186
 
228
-	if (!mutex_trylock(&sxprt->xpt_mutex)) {
229
-		rpc_sleep_on(&sxprt->xpt_bc_pending, task, NULL);
230
-		if (!mutex_trylock(&sxprt->xpt_mutex))
231
-			return -EAGAIN;
232
-		rpc_wake_up_queued_task(&sxprt->xpt_bc_pending, task);
233
-	}
234
-
235
-	ret = -ENOTCONN;
236
-	rdma = container_of(sxprt, struct svcxprt_rdma, sc_xprt);
237
-	if (!test_bit(XPT_DEAD, &sxprt->xpt_flags))
238
-		ret = rpcrdma_bc_send_request(rdma, rqst);
239
-
240
-	mutex_unlock(&sxprt->xpt_mutex);
241
-
242
-	if (ret < 0)
243
-		return ret;
244
-	return 0;
187
+	ret = rpcrdma_bc_send_request(rdma, rqst);
188
+	if (ret == -ENOTCONN)
189
+		svc_close_xprt(sxprt);
190
+	return ret;
245
191
 }
246
192
 
247
193
 static void
248
194
 xprt_rdma_bc_close(struct rpc_xprt *xprt)
249
195
 {
250
-	dprintk("svcrdma: %s: xprt %p\n", __func__, xprt);
196
+	xprt_disconnect_done(xprt);
251
197
 	xprt->cwnd = RPC_CWNDSHIFT;
252
198
 }
253
199
 
254
200
 static void
255
201
 xprt_rdma_bc_put(struct rpc_xprt *xprt)
256
202
 {
257
-	dprintk("svcrdma: %s: xprt %p\n", __func__, xprt);
258
-
259
203
 	xprt_rdma_free_addresses(xprt);
260
204
 	xprt_free(xprt);
261
-	module_put(THIS_MODULE);
262
205
 }
263
206
 
264
207
 static const struct rpc_xprt_ops xprt_rdma_bc_procs = {
..
..
@@ -270,7 +213,7 @@
270
213
 	.buf_alloc		= xprt_rdma_bc_allocate,
271
214
 	.buf_free		= xprt_rdma_bc_free,
272
215
 	.send_request		= xprt_rdma_bc_send_request,
273
-	.set_retrans_timeout	= xprt_set_retrans_timeout_def,
216
+	.wait_for_reply_request	= xprt_wait_for_reply_request_def,
274
217
 	.close			= xprt_rdma_bc_close,
275
218
 	.destroy		= xprt_rdma_bc_put,
276
219
 	.print_stats		= xprt_rdma_print_stats
..
..
@@ -291,19 +234,14 @@
291
234
 	struct rpc_xprt *xprt;
292
235
 	struct rpcrdma_xprt *new_xprt;
293
236
 
294
-	if (args->addrlen > sizeof(xprt->addr)) {
295
-		dprintk("RPC:       %s: address too large\n", __func__);
237
+	if (args->addrlen > sizeof(xprt->addr))
296
238
 		return ERR_PTR(-EBADF);
297
-	}
298
239
 
299
240
 	xprt = xprt_alloc(args->net, sizeof(*new_xprt),
300
241
 			  RPCRDMA_MAX_BC_REQUESTS,
301
242
 			  RPCRDMA_MAX_BC_REQUESTS);
302
-	if (!xprt) {
303
-		dprintk("RPC:       %s: couldn't allocate rpc_xprt\n",
304
-			__func__);
243
+	if (!xprt)
305
244
 		return ERR_PTR(-ENOMEM);
306
-	}
307
245
 
308
246
 	xprt->timeout = &xprt_rdma_bc_timeout;
309
247
 	xprt_set_bound(xprt);
..
..
@@ -313,7 +251,6 @@
313
251
 	xprt->idle_timeout = 0;
314
252
 
315
253
 	xprt->prot = XPRT_TRANSPORT_BC_RDMA;
316
-	xprt->tsh_size = 0;
317
254
 	xprt->ops = &xprt_rdma_bc_procs;
318
255
 
319
256
 	memcpy(&xprt->addr, args->dstaddr, args->addrlen);
..
..
@@ -330,20 +267,9 @@
330
267
 	args->bc_xprt->xpt_bc_xprt = xprt;
331
268
 	xprt->bc_xprt = args->bc_xprt;
332
269
 
333
-	if (!try_module_get(THIS_MODULE))
334
-		goto out_fail;
335
-
336
270
 	/* Final put for backchannel xprt is in __svc_rdma_free */
337
271
 	xprt_get(xprt);
338
272
 	return xprt;
339
-
340
-out_fail:
341
-	xprt_rdma_free_addresses(xprt);
342
-	args->bc_xprt->xpt_bc_xprt = NULL;
343
-	args->bc_xprt->xpt_bc_xps = NULL;
344
-	xprt_put(xprt);
345
-	xprt_free(xprt);
346
-	return ERR_PTR(-EINVAL);
347
273
 }
348
274
 
349
275
 struct xprt_class xprt_rdma_bc = {