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()
208 	svc_rdma_cc_init(rdma, &ctxt->sc_reply_info.wi_cc);  in svc_rdma_send_ctxt_get()
218 	ctxt = svc_rdma_send_ctxt_alloc(rdma);  in svc_rdma_send_ctxt_get()
224 static void svc_rdma_send_ctxt_release(struct svcxprt_rdma *rdma,  in svc_rdma_send_ctxt_release()  argument
227 	struct ib_device *device = rdma->sc_cm_id->device;  in svc_rdma_send_ctxt_release()
230 	svc_rdma_reply_chunk_release(rdma, ctxt);  in svc_rdma_send_ctxt_release()
248 	llist_add(&ctxt->sc_node, &rdma->sc_send_ctxts);  in svc_rdma_send_ctxt_release()
261  * @rdma: controlling svcxprt_rdma
266 void svc_rdma_send_ctxt_put(struct svcxprt_rdma *rdma,  in svc_rdma_send_ctxt_put()  argument
275  * @rdma: controlling transport
279 void svc_rdma_wake_send_waiters(struct svcxprt_rdma *rdma, int avail)  in svc_rdma_wake_send_waiters()  argument
281 	atomic_add(avail, &rdma->sc_sq_avail);  in svc_rdma_wake_send_waiters()
283 	if (unlikely(waitqueue_active(&rdma->sc_send_wait)))  in svc_rdma_wake_send_waiters()
284 		wake_up(&rdma->sc_send_wait);  in svc_rdma_wake_send_waiters()
288  * svc_rdma_wc_send - Invoked by RDMA provider for each polled Send WC
297 	struct svcxprt_rdma *rdma = cq->cq_context;  in svc_rdma_wc_send()  local
302 	svc_rdma_wake_send_waiters(rdma, ctxt->sc_sqecount);  in svc_rdma_wc_send()
308 	svc_rdma_send_ctxt_put(rdma, ctxt);  in svc_rdma_wc_send()
316 	svc_rdma_send_ctxt_put(rdma, ctxt);  in svc_rdma_wc_send()
317 	svc_xprt_deferred_close(&rdma->sc_xprt);  in svc_rdma_wc_send()
322  * @rdma: transport context
338 int svc_rdma_post_send(struct svcxprt_rdma *rdma,  in svc_rdma_post_send()  argument
350 	ib_dma_sync_single_for_device(rdma->sc_pd->device,  in svc_rdma_post_send()
356 	while (!test_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags)) {  in svc_rdma_post_send()
357 		if (atomic_sub_return(sqecount, &rdma->sc_sq_avail) < 0) {  in svc_rdma_post_send()
358 			svc_rdma_wake_send_waiters(rdma, sqecount);  in svc_rdma_post_send()
367 			trace_svcrdma_sq_full(rdma, &cid);  in svc_rdma_post_send()
368 			wait_event(rdma->sc_send_wait,  in svc_rdma_post_send()
369 				   atomic_read(&rdma->sc_sq_avail) > 0);  in svc_rdma_post_send()
370 			trace_svcrdma_sq_retry(rdma, &cid);  in svc_rdma_post_send()
375 		ret = ib_post_send(rdma->sc_qp, first_wr, &bad_wr);  in svc_rdma_post_send()
377 			trace_svcrdma_sq_post_err(rdma, &cid, ret);  in svc_rdma_post_send()
378 			svc_xprt_deferred_close(&rdma->sc_xprt);  in svc_rdma_post_send()
384 				svc_rdma_wake_send_waiters(rdma, sqecount);  in svc_rdma_post_send()
404 	/* RPC-over-RDMA version 1 replies never have a Read list. */  in svc_rdma_encode_read_list()
566 	struct svcxprt_rdma *rdma = args->md_rdma;  in svc_rdma_page_dma_map()  local
568 	struct ib_device *dev = rdma->sc_cm_id->device;  in svc_rdma_page_dma_map()
694  * @rdma: controlling transport
703 static bool svc_rdma_pull_up_needed(const struct svcxprt_rdma *rdma,  in svc_rdma_pull_up_needed()  argument
722 	return args.pd_num_sges >= rdma->sc_max_send_sges;  in svc_rdma_pull_up_needed()
769  * @rdma: controlling transport
784 static int svc_rdma_pull_up_reply_msg(const struct svcxprt_rdma *rdma,  in svc_rdma_pull_up_reply_msg()  argument
805  * @rdma: controlling transport
818 int svc_rdma_map_reply_msg(struct svcxprt_rdma *rdma,  in svc_rdma_map_reply_msg()  argument
825 		.md_rdma	= rdma,  in svc_rdma_map_reply_msg()
842 	if (svc_rdma_pull_up_needed(rdma, sctxt, write_pcl, xdr))  in svc_rdma_map_reply_msg()
843 		return svc_rdma_pull_up_reply_msg(rdma, sctxt, write_pcl, xdr);  in svc_rdma_map_reply_msg()
869  * via RDMA Send. The RPC-over-RDMA transport header is prepared
880 static int svc_rdma_send_reply_msg(struct svcxprt_rdma *rdma,  in svc_rdma_send_reply_msg()  argument
888 	ret = svc_rdma_map_reply_msg(rdma, sctxt, &rctxt->rc_write_pcl,  in svc_rdma_send_reply_msg()
893 	/* Transfer pages involved in RDMA Writes to the sctxt's  in svc_rdma_send_reply_msg()
905 	return svc_rdma_post_send(rdma, sctxt);  in svc_rdma_send_reply_msg()
909  * svc_rdma_send_error_msg - Send an RPC/RDMA v1 error response
910  * @rdma: controlling transport context
923 void svc_rdma_send_error_msg(struct svcxprt_rdma *rdma,  in svc_rdma_send_error_msg()  argument
942 	*p++ = rdma->sc_fc_credits;  in svc_rdma_send_error_msg()
969 	if (svc_rdma_post_send(rdma, sctxt))  in svc_rdma_send_error_msg()
974 	svc_rdma_send_ctxt_put(rdma, sctxt);  in svc_rdma_send_error_msg()
992 	struct svcxprt_rdma *rdma =  in svc_rdma_sendto()  local
1006 	sctxt = svc_rdma_send_ctxt_get(rdma);  in svc_rdma_sendto()
1016 	ret = svc_rdma_send_write_list(rdma, rctxt, &rqstp->rq_res);  in svc_rdma_sendto()
1022 		ret = svc_rdma_prepare_reply_chunk(rdma, &rctxt->rc_write_pcl,  in svc_rdma_sendto()
1032 	*p++ = rdma->sc_fc_credits;  in svc_rdma_sendto()
1045 	ret = svc_rdma_send_reply_msg(rdma, sctxt, rctxt, rqstp);  in svc_rdma_sendto()
1055 	 * of previously posted RDMA Writes.  in svc_rdma_sendto()
1058 	svc_rdma_send_error_msg(rdma, sctxt, rctxt, ret);  in svc_rdma_sendto()
1062 	svc_rdma_send_ctxt_put(rdma, sctxt);  in svc_rdma_sendto()
1065 	svc_xprt_deferred_close(&rdma->sc_xprt);  in svc_rdma_sendto()