51  * XDR-encoded RPC Reply message. sendto must construct the RPC-over-RDMA
105 #include <rdma/ib_verbs.h>
106 #include <rdma/rdma_cm.h>
117 svc_rdma_send_ctxt_alloc(struct svcxprt_rdma *rdma)  in svc_rdma_send_ctxt_alloc()  argument
119 	int node = ibdev_to_node(rdma->sc_cm_id->device);  in svc_rdma_send_ctxt_alloc()
125 	ctxt = kzalloc_node(struct_size(ctxt, sc_sges, rdma->sc_max_send_sges),  in svc_rdma_send_ctxt_alloc()
129 	buffer = kmalloc_node(rdma->sc_max_req_size, GFP_KERNEL, node);  in svc_rdma_send_ctxt_alloc()
132 	addr = ib_dma_map_single(rdma->sc_pd->device, buffer,  in svc_rdma_send_ctxt_alloc()
133 				 rdma->sc_max_req_size, DMA_TO_DEVICE);  in svc_rdma_send_ctxt_alloc()
134 	if (ib_dma_mapping_error(rdma->sc_pd->device, addr))  in svc_rdma_send_ctxt_alloc()
137 	svc_rdma_send_cid_init(rdma, &ctxt->sc_cid);  in svc_rdma_send_ctxt_alloc()
139 	ctxt->sc_rdma = rdma;  in svc_rdma_send_ctxt_alloc()
147 		     rdma->sc_max_req_size);  in svc_rdma_send_ctxt_alloc()
150 	for (i = 0; i < rdma->sc_max_send_sges; i++)  in svc_rdma_send_ctxt_alloc()
151 		ctxt->sc_sges[i].lkey = rdma->sc_pd->local_dma_lkey;  in svc_rdma_send_ctxt_alloc()
164  * @rdma: svcxprt_rdma being torn down
167 void svc_rdma_send_ctxts_destroy(struct svcxprt_rdma *rdma)  in svc_rdma_send_ctxts_destroy()  argument
172 	while ((node = llist_del_first(&rdma->sc_send_ctxts)) != NULL) {  in svc_rdma_send_ctxts_destroy()
174 		ib_dma_unmap_single(rdma->sc_pd->device,  in svc_rdma_send_ctxts_destroy()
176 				    rdma->sc_max_req_size,  in svc_rdma_send_ctxts_destroy()
185  * @rdma: controlling svcxprt_rdma
190 struct svc_rdma_send_ctxt *svc_rdma_send_ctxt_get(struct svcxprt_rdma *rdma)  in svc_rdma_send_ctxt_get()  argument
195 	spin_lock(&rdma->sc_send_lock);  in svc_rdma_send_ctxt_get()
196 	node = llist_del_first(&rdma->sc_send_ctxts);  in svc_rdma_send_ctxt_get()
197 	spin_unlock(&rdma->sc_send_lock);  in svc_rdma_send_ctxt_get()
214 	ctxt = svc_rdma_send_ctxt_alloc(rdma);  in svc_rdma_send_ctxt_get()
220 static void svc_rdma_send_ctxt_release(struct svcxprt_rdma *rdma,  in svc_rdma_send_ctxt_release()  argument
223 	struct ib_device *device = rdma->sc_cm_id->device;  in svc_rdma_send_ctxt_release()
242 	llist_add(&ctxt->sc_node, &rdma->sc_send_ctxts);  in svc_rdma_send_ctxt_release()
255  * @rdma: controlling svcxprt_rdma
260 void svc_rdma_send_ctxt_put(struct svcxprt_rdma *rdma,  in svc_rdma_send_ctxt_put()  argument
269  * @rdma: controlling transport
273 void svc_rdma_wake_send_waiters(struct svcxprt_rdma *rdma, int avail)  in svc_rdma_wake_send_waiters()  argument
275 	atomic_add(avail, &rdma->sc_sq_avail);  in svc_rdma_wake_send_waiters()
277 	if (unlikely(waitqueue_active(&rdma->sc_send_wait)))  in svc_rdma_wake_send_waiters()
278 		wake_up(&rdma->sc_send_wait);  in svc_rdma_wake_send_waiters()
282  * svc_rdma_wc_send - Invoked by RDMA provider for each polled Send WC
291 	struct svcxprt_rdma *rdma = cq->cq_context;  in svc_rdma_wc_send()  local
296 	svc_rdma_wake_send_waiters(rdma, 1);  in svc_rdma_wc_send()
302 	svc_rdma_send_ctxt_put(rdma, ctxt);  in svc_rdma_wc_send()
310 	svc_rdma_send_ctxt_put(rdma, ctxt);  in svc_rdma_wc_send()
311 	svc_xprt_deferred_close(&rdma->sc_xprt);  in svc_rdma_wc_send()
316  * @rdma: transport on which to post the WR
322 int svc_rdma_send(struct svcxprt_rdma *rdma, struct svc_rdma_send_ctxt *ctxt)  in svc_rdma_send()  argument
330 	ib_dma_sync_single_for_device(rdma->sc_pd->device,  in svc_rdma_send()
337 		if ((atomic_dec_return(&rdma->sc_sq_avail) < 0)) {  in svc_rdma_send()
339 			trace_svcrdma_sq_full(rdma, &ctxt->sc_cid);  in svc_rdma_send()
340 			atomic_inc(&rdma->sc_sq_avail);  in svc_rdma_send()
341 			wait_event(rdma->sc_send_wait,  in svc_rdma_send()
342 				   atomic_read(&rdma->sc_sq_avail) > 1);  in svc_rdma_send()
343 			if (test_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags))  in svc_rdma_send()
345 			trace_svcrdma_sq_retry(rdma, &ctxt->sc_cid);  in svc_rdma_send()
350 		ret = ib_post_send(rdma->sc_qp, wr, NULL);  in svc_rdma_send()
356 	trace_svcrdma_sq_post_err(rdma, &ctxt->sc_cid, ret);  in svc_rdma_send()
357 	svc_xprt_deferred_close(&rdma->sc_xprt);  in svc_rdma_send()
358 	wake_up(&rdma->sc_send_wait);  in svc_rdma_send()
373 	/* RPC-over-RDMA version 1 replies never have a Read list. */  in svc_rdma_encode_read_list()
535 	struct svcxprt_rdma *rdma = args->md_rdma;  in svc_rdma_page_dma_map()  local
537 	struct ib_device *dev = rdma->sc_cm_id->device;  in svc_rdma_page_dma_map()
663  * @rdma: controlling transport
672 static bool svc_rdma_pull_up_needed(const struct svcxprt_rdma *rdma,  in svc_rdma_pull_up_needed()  argument
691 	return args.pd_num_sges >= rdma->sc_max_send_sges;  in svc_rdma_pull_up_needed()
738  * @rdma: controlling transport
753 static int svc_rdma_pull_up_reply_msg(const struct svcxprt_rdma *rdma,  in svc_rdma_pull_up_reply_msg()  argument
774  * @rdma: controlling transport
787 int svc_rdma_map_reply_msg(struct svcxprt_rdma *rdma,  in svc_rdma_map_reply_msg()  argument
794 		.md_rdma	= rdma,  in svc_rdma_map_reply_msg()
811 	if (svc_rdma_pull_up_needed(rdma, sctxt, write_pcl, xdr))  in svc_rdma_map_reply_msg()
812 		return svc_rdma_pull_up_reply_msg(rdma, sctxt, write_pcl, xdr);  in svc_rdma_map_reply_msg()
838  * via RDMA Send. The RPC-over-RDMA transport header is prepared
846  * RDMA Send is the last step of transmitting an RPC reply. Pages
847  * involved in the earlier RDMA Writes are here transferred out
855 static int svc_rdma_send_reply_msg(struct svcxprt_rdma *rdma,  in svc_rdma_send_reply_msg()  argument
862 	ret = svc_rdma_map_reply_msg(rdma, sctxt, &rctxt->rc_write_pcl,  in svc_rdma_send_reply_msg()
876 	return svc_rdma_send(rdma, sctxt);  in svc_rdma_send_reply_msg()
880  * svc_rdma_send_error_msg - Send an RPC/RDMA v1 error response
881  * @rdma: controlling transport context
894 void svc_rdma_send_error_msg(struct svcxprt_rdma *rdma,  in svc_rdma_send_error_msg()  argument
913 	*p++ = rdma->sc_fc_credits;  in svc_rdma_send_error_msg()
940 	if (svc_rdma_send(rdma, sctxt))  in svc_rdma_send_error_msg()
945 	svc_rdma_send_ctxt_put(rdma, sctxt);  in svc_rdma_send_error_msg()
963 	struct svcxprt_rdma *rdma =  in svc_rdma_sendto()  local
977 	sctxt = svc_rdma_send_ctxt_get(rdma);  in svc_rdma_sendto()
987 	ret = svc_rdma_send_reply_chunk(rdma, rctxt, &rqstp->rq_res);  in svc_rdma_sendto()
994 	*p++ = rdma->sc_fc_credits;  in svc_rdma_sendto()
1007 	ret = svc_rdma_send_reply_msg(rdma, sctxt, rctxt, rqstp);  in svc_rdma_sendto()
1017 	 * of previously posted RDMA Writes.  in svc_rdma_sendto()
1020 	svc_rdma_send_error_msg(rdma, sctxt, rctxt, ret);  in svc_rdma_sendto()
1024 	svc_rdma_send_ctxt_put(rdma, sctxt);  in svc_rdma_sendto()
1027 	svc_xprt_deferred_close(&rdma->sc_xprt);  in svc_rdma_sendto()
1051 	struct svcxprt_rdma *rdma;  in svc_rdma_result_payload()  local
1069 	rdma = container_of(rqstp->rq_xprt, struct svcxprt_rdma, sc_xprt);  in svc_rdma_result_payload()
1070 	ret = svc_rdma_send_write_chunk(rdma, chunk, &subbuf);  in svc_rdma_result_payload()