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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/net/sunrpc/xprtrdma/backchannel.c
..
..
@@ -5,7 +5,6 @@
5
5
  * Support for backward direction RPCs on RPC/RDMA.
6
6
  */
7
7
 
8
-#include <linux/module.h>
9
8
 #include <linux/sunrpc/xprt.h>
10
9
 #include <linux/sunrpc/svc.h>
11
10
 #include <linux/sunrpc/svc_xprt.h>
..
..
@@ -20,59 +19,6 @@
20
19
 
21
20
 #undef RPCRDMA_BACKCHANNEL_DEBUG
22
21
 
23
-static void rpcrdma_bc_free_rqst(struct rpcrdma_xprt *r_xprt,
24
-				 struct rpc_rqst *rqst)
25
-{
26
-	struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
27
-	struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
28
-
29
-	spin_lock(&buf->rb_reqslock);
30
-	list_del(&req->rl_all);
31
-	spin_unlock(&buf->rb_reqslock);
32
-
33
-	rpcrdma_destroy_req(req);
34
-}
35
-
36
-static int rpcrdma_bc_setup_reqs(struct rpcrdma_xprt *r_xprt,
37
-				 unsigned int count)
38
-{
39
-	struct rpc_xprt *xprt = &r_xprt->rx_xprt;
40
-	struct rpc_rqst *rqst;
41
-	unsigned int i;
42
-
43
-	for (i = 0; i < (count << 1); i++) {
44
-		struct rpcrdma_regbuf *rb;
45
-		struct rpcrdma_req *req;
46
-		size_t size;
47
-
48
-		req = rpcrdma_create_req(r_xprt);
49
-		if (IS_ERR(req))
50
-			return PTR_ERR(req);
51
-		rqst = &req->rl_slot;
52
-
53
-		rqst->rq_xprt = xprt;
54
-		INIT_LIST_HEAD(&rqst->rq_list);
55
-		INIT_LIST_HEAD(&rqst->rq_bc_list);
56
-		__set_bit(RPC_BC_PA_IN_USE, &rqst->rq_bc_pa_state);
57
-		spin_lock_bh(&xprt->bc_pa_lock);
58
-		list_add(&rqst->rq_bc_pa_list, &xprt->bc_pa_list);
59
-		spin_unlock_bh(&xprt->bc_pa_lock);
60
-
61
-		size = r_xprt->rx_data.inline_rsize;
62
-		rb = rpcrdma_alloc_regbuf(size, DMA_TO_DEVICE, GFP_KERNEL);
63
-		if (IS_ERR(rb))
64
-			goto out_fail;
65
-		req->rl_sendbuf = rb;
66
-		xdr_buf_init(&rqst->rq_snd_buf, rb->rg_base,
67
-			     min_t(size_t, size, PAGE_SIZE));
68
-	}
69
-	return 0;
70
-
71
-out_fail:
72
-	rpcrdma_bc_free_rqst(r_xprt, rqst);
73
-	return -ENOMEM;
74
-}
75
-
76
22
 /**
77
23
  * xprt_rdma_bc_setup - Pre-allocate resources for handling backchannel requests
78
24
  * @xprt: transport associated with these backchannel resources
..
..
@@ -83,54 +29,9 @@
83
29
 int xprt_rdma_bc_setup(struct rpc_xprt *xprt, unsigned int reqs)
84
30
 {
85
31
 	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
86
-	int rc;
87
32
 
88
-	/* The backchannel reply path returns each rpc_rqst to the
89
-	 * bc_pa_list _after_ the reply is sent. If the server is
90
-	 * faster than the client, it can send another backward
91
-	 * direction request before the rpc_rqst is returned to the
92
-	 * list. The client rejects the request in this case.
93
-	 *
94
-	 * Twice as many rpc_rqsts are prepared to ensure there is
95
-	 * always an rpc_rqst available as soon as a reply is sent.
96
-	 */
97
-	if (reqs > RPCRDMA_BACKWARD_WRS >> 1)
98
-		goto out_err;
99
-
100
-	rc = rpcrdma_bc_setup_reqs(r_xprt, reqs);
101
-	if (rc)
102
-		goto out_free;
103
-
104
-	r_xprt->rx_buf.rb_bc_srv_max_requests = reqs;
105
-	request_module("svcrdma");
33
+	r_xprt->rx_buf.rb_bc_srv_max_requests = RPCRDMA_BACKWARD_WRS >> 1;
106
34
 	trace_xprtrdma_cb_setup(r_xprt, reqs);
107
-	return 0;
108
-
109
-out_free:
110
-	xprt_rdma_bc_destroy(xprt, reqs);
111
-
112
-out_err:
113
-	pr_err("RPC:       %s: setup backchannel transport failed\n", __func__);
114
-	return -ENOMEM;
115
-}
116
-
117
-/**
118
- * xprt_rdma_bc_up - Create transport endpoint for backchannel service
119
- * @serv: server endpoint
120
- * @net: network namespace
121
- *
122
- * The "xprt" is an implied argument: it supplies the name of the
123
- * backchannel transport class.
124
- *
125
- * Returns zero on success, negative errno on failure
126
- */
127
-int xprt_rdma_bc_up(struct svc_serv *serv, struct net *net)
128
-{
129
-	int ret;
130
-
131
-	ret = svc_create_xprt(serv, "rdma-bc", net, PF_INET, 0, 0);
132
-	if (ret < 0)
133
-		return ret;
134
35
 	return 0;
135
36
 }
136
37
 
..
..
@@ -143,12 +44,17 @@
143
44
 size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *xprt)
144
45
 {
145
46
 	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
146
-	struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
47
+	struct rpcrdma_ep *ep = r_xprt->rx_ep;
147
48
 	size_t maxmsg;
148
49
 
149
-	maxmsg = min_t(unsigned int, cdata->inline_rsize, cdata->inline_wsize);
50
+	maxmsg = min_t(unsigned int, ep->re_inline_send, ep->re_inline_recv);
150
51
 	maxmsg = min_t(unsigned int, maxmsg, PAGE_SIZE);
151
52
 	return maxmsg - RPCRDMA_HDRLEN_MIN;
53
+}
54
+
55
+unsigned int xprt_rdma_bc_max_slots(struct rpc_xprt *xprt)
56
+{
57
+	return RPCRDMA_BACKWARD_WRS >> 1;
152
58
 }
153
59
 
154
60
 static int rpcrdma_bc_marshal_reply(struct rpc_rqst *rqst)
..
..
@@ -159,7 +65,7 @@
159
65
 
160
66
 	rpcrdma_set_xdrlen(&req->rl_hdrbuf, 0);
161
67
 	xdr_init_encode(&req->rl_stream, &req->rl_hdrbuf,
162
-			req->rl_rdmabuf->rg_base);
68
+			rdmab_data(req->rl_rdmabuf), rqst);
163
69
 
164
70
 	p = xdr_reserve_space(&req->rl_stream, 28);
165
71
 	if (unlikely(!p))
..
..
@@ -173,7 +79,7 @@
173
79
 	*p = xdr_zero;
174
80
 
175
81
 	if (rpcrdma_prepare_send_sges(r_xprt, req, RPCRDMA_HDRLEN_MIN,
176
-				      &rqst->rq_snd_buf, rpcrdma_noch))
82
+				      &rqst->rq_snd_buf, rpcrdma_noch_pullup))
177
83
 		return -EIO;
178
84
 
179
85
 	trace_xprtrdma_cb_reply(rqst);
..
..
@@ -194,19 +100,22 @@
194
100
  */
195
101
 int xprt_rdma_bc_send_reply(struct rpc_rqst *rqst)
196
102
 {
197
-	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
103
+	struct rpc_xprt *xprt = rqst->rq_xprt;
104
+	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
198
105
 	struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
199
106
 	int rc;
200
107
 
201
-	if (!xprt_connected(rqst->rq_xprt))
202
-		goto drop_connection;
108
+	if (!xprt_connected(xprt))
109
+		return -ENOTCONN;
110
+
111
+	if (!xprt_request_get_cong(xprt, rqst))
112
+		return -EBADSLT;
203
113
 
204
114
 	rc = rpcrdma_bc_marshal_reply(rqst);
205
115
 	if (rc < 0)
206
116
 		goto failed_marshal;
207
117
 
208
-	rpcrdma_post_recvs(r_xprt, true);
209
-	if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req))
118
+	if (rpcrdma_post_sends(r_xprt, req))
210
119
 		goto drop_connection;
211
120
 	return 0;
212
121
 
..
..
@@ -214,7 +123,7 @@
214
123
 	if (rc != -ENOTCONN)
215
124
 		return rc;
216
125
 drop_connection:
217
-	xprt_disconnect_done(rqst->rq_xprt);
126
+	xprt_rdma_close(xprt);
218
127
 	return -ENOTCONN;
219
128
 }
220
129
 
..
..
@@ -225,19 +134,18 @@
225
134
  */
226
135
 void xprt_rdma_bc_destroy(struct rpc_xprt *xprt, unsigned int reqs)
227
136
 {
228
-	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
229
137
 	struct rpc_rqst *rqst, *tmp;
230
138
 
231
-	spin_lock_bh(&xprt->bc_pa_lock);
139
+	spin_lock(&xprt->bc_pa_lock);
232
140
 	list_for_each_entry_safe(rqst, tmp, &xprt->bc_pa_list, rq_bc_pa_list) {
233
141
 		list_del(&rqst->rq_bc_pa_list);
234
-		spin_unlock_bh(&xprt->bc_pa_lock);
142
+		spin_unlock(&xprt->bc_pa_lock);
235
143
 
236
-		rpcrdma_bc_free_rqst(r_xprt, rqst);
144
+		rpcrdma_req_destroy(rpcr_to_rdmar(rqst));
237
145
 
238
-		spin_lock_bh(&xprt->bc_pa_lock);
146
+		spin_lock(&xprt->bc_pa_lock);
239
147
 	}
240
-	spin_unlock_bh(&xprt->bc_pa_lock);
148
+	spin_unlock(&xprt->bc_pa_lock);
241
149
 }
242
150
 
243
151
 /**
..
..
@@ -249,15 +157,54 @@
249
157
 	struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
250
158
 	struct rpc_xprt *xprt = rqst->rq_xprt;
251
159
 
252
-	dprintk("RPC:       %s: freeing rqst %p (req %p)\n",
253
-		__func__, rqst, req);
254
-
255
160
 	rpcrdma_recv_buffer_put(req->rl_reply);
256
161
 	req->rl_reply = NULL;
257
162
 
258
-	spin_lock_bh(&xprt->bc_pa_lock);
163
+	spin_lock(&xprt->bc_pa_lock);
259
164
 	list_add_tail(&rqst->rq_bc_pa_list, &xprt->bc_pa_list);
260
-	spin_unlock_bh(&xprt->bc_pa_lock);
165
+	spin_unlock(&xprt->bc_pa_lock);
166
+	xprt_put(xprt);
167
+}
168
+
169
+static struct rpc_rqst *rpcrdma_bc_rqst_get(struct rpcrdma_xprt *r_xprt)
170
+{
171
+	struct rpc_xprt *xprt = &r_xprt->rx_xprt;
172
+	struct rpcrdma_req *req;
173
+	struct rpc_rqst *rqst;
174
+	size_t size;
175
+
176
+	spin_lock(&xprt->bc_pa_lock);
177
+	rqst = list_first_entry_or_null(&xprt->bc_pa_list, struct rpc_rqst,
178
+					rq_bc_pa_list);
179
+	if (!rqst)
180
+		goto create_req;
181
+	list_del(&rqst->rq_bc_pa_list);
182
+	spin_unlock(&xprt->bc_pa_lock);
183
+	return rqst;
184
+
185
+create_req:
186
+	spin_unlock(&xprt->bc_pa_lock);
187
+
188
+	/* Set a limit to prevent a remote from overrunning our resources.
189
+	 */
190
+	if (xprt->bc_alloc_count >= RPCRDMA_BACKWARD_WRS)
191
+		return NULL;
192
+
193
+	size = min_t(size_t, r_xprt->rx_ep->re_inline_recv, PAGE_SIZE);
194
+	req = rpcrdma_req_create(r_xprt, size, GFP_KERNEL);
195
+	if (!req)
196
+		return NULL;
197
+	if (rpcrdma_req_setup(r_xprt, req)) {
198
+		rpcrdma_req_destroy(req);
199
+		return NULL;
200
+	}
201
+
202
+	xprt->bc_alloc_count++;
203
+	rqst = &req->rl_slot;
204
+	rqst->rq_xprt = xprt;
205
+	__set_bit(RPC_BC_PA_IN_USE, &rqst->rq_bc_pa_state);
206
+	xdr_buf_init(&rqst->rq_snd_buf, rdmab_data(req->rl_sendbuf), size);
207
+	return rqst;
261
208
 }
262
209
 
263
210
 /**
..
..
@@ -291,20 +238,11 @@
291
238
 	pr_info("RPC:       %s: %*ph\n", __func__, size, p);
292
239
 #endif
293
240
 
294
-	/* Grab a free bc rqst */
295
-	spin_lock(&xprt->bc_pa_lock);
296
-	if (list_empty(&xprt->bc_pa_list)) {
297
-		spin_unlock(&xprt->bc_pa_lock);
241
+	rqst = rpcrdma_bc_rqst_get(r_xprt);
242
+	if (!rqst)
298
243
 		goto out_overflow;
299
-	}
300
-	rqst = list_first_entry(&xprt->bc_pa_list,
301
-				struct rpc_rqst, rq_bc_pa_list);
302
-	list_del(&rqst->rq_bc_pa_list);
303
-	spin_unlock(&xprt->bc_pa_lock);
304
244
 
305
-	/* Prepare rqst */
306
245
 	rqst->rq_reply_bytes_recvd = 0;
307
-	rqst->rq_bytes_sent = 0;
308
246
 	rqst->rq_xid = *p;
309
247
 
310
248
 	rqst->rq_private_buf.len = size;
..
..
@@ -326,6 +264,7 @@
326
264
 
327
265
 	/* Queue rqst for ULP's callback service */
328
266
 	bc_serv = xprt->bc_serv;
267
+	xprt_get(xprt);
329
268
 	spin_lock(&bc_serv->sv_cb_lock);
330
269
 	list_add(&rqst->rq_bc_list, &bc_serv->sv_cb_list);
331
270
 	spin_unlock(&bc_serv->sv_cb_lock);
..
..
@@ -337,7 +276,7 @@
337
276
 
338
277
 out_overflow:
339
278
 	pr_warn("RPC/RDMA backchannel overflow\n");
340
-	xprt_disconnect_done(xprt);
279
+	xprt_force_disconnect(xprt);
341
280
 	/* This receive buffer gets reposted automatically
342
281
 	 * when the connection is re-established.
343
282
 	 */