3  * Shared Memory Communications over RDMA (SMC-R) and RoCE
19 #include "smc.h"
55 static int smc_rx_update_consumer(struct smc_sock *smc,  in smc_rx_update_consumer()  argument
58 	struct smc_connection *conn = &smc->conn;  in smc_rx_update_consumer()
59 	struct sock *sk = &smc->sk;  in smc_rx_update_consumer()
96 static void smc_rx_update_cons(struct smc_sock *smc, size_t len)  in smc_rx_update_cons()  argument
98 	struct smc_connection *conn = &smc->conn;  in smc_rx_update_cons()
102 	smc_rx_update_consumer(smc, cons, len);  in smc_rx_update_cons()
106 	struct smc_sock *smc;  member
114 	struct smc_sock *smc = priv->smc;  in smc_rx_pipe_buf_release()  local
116 	struct sock *sk = &smc->sk;  in smc_rx_pipe_buf_release()
122 	conn = &smc->conn;  in smc_rx_pipe_buf_release()
124 	smc_rx_update_cons(smc, priv->len);  in smc_rx_pipe_buf_release()
146 			 struct smc_sock *smc)  in smc_rx_splice()  argument
148 	struct smc_link_group *lgr = smc->conn.lgr;  in smc_rx_splice()
157 	nr_pages = !lgr->is_smcd && smc->conn.rmb_desc->is_vm ?  in smc_rx_splice()
176 	    (!lgr->is_smcd && !smc->conn.rmb_desc->is_vm)) {  in smc_rx_splice()
179 		priv[0]->smc = smc;  in smc_rx_splice()
180 		partial[0].offset = src - (char *)smc->conn.rmb_desc->cpu_addr;  in smc_rx_splice()
183 		pages[0] = smc->conn.rmb_desc->pages;  in smc_rx_splice()
191 			priv[i]->smc = smc;  in smc_rx_splice()
210 		sock_hold(&smc->sk);  in smc_rx_splice()
211 		if (!lgr->is_smcd && smc->conn.rmb_desc->is_vm) {  in smc_rx_splice()
215 			get_page(smc->conn.rmb_desc->pages);  in smc_rx_splice()
217 		atomic_add(bytes, &smc->conn.splice_pending);  in smc_rx_splice()
244  *   @smc    smc socket
251 int smc_rx_wait(struct smc_sock *smc, long *timeo,  in smc_rx_wait()  argument
255 	struct smc_connection *conn = &smc->conn;  in smc_rx_wait()
258 	struct sock *sk = &smc->sk;  in smc_rx_wait()
277 static int smc_rx_recv_urg(struct smc_sock *smc, struct msghdr *msg, int len,  in smc_rx_recv_urg()  argument
280 	struct smc_connection *conn = &smc->conn;  in smc_rx_recv_urg()
282 	struct sock *sk = &smc->sk;  in smc_rx_recv_urg()
290 	SMC_STAT_INC(smc, urg_data_cnt);  in smc_rx_recv_urg()
293 			smc->conn.urg_state = SMC_URG_READ;  in smc_rx_recv_urg()
307 				smc_rx_update_consumer(smc, cons, 0);  in smc_rx_recv_urg()
321 static bool smc_rx_recvmsg_data_available(struct smc_sock *smc)  in smc_rx_recvmsg_data_available()  argument
323 	struct smc_connection *conn = &smc->conn;  in smc_rx_recvmsg_data_available()
329 		smc_rx_update_cons(smc, 0);  in smc_rx_recvmsg_data_available()
340 int smc_rx_recvmsg(struct smc_sock *smc, struct msghdr *msg,  in smc_rx_recvmsg()  argument
345 	struct smc_connection *conn = &smc->conn;  in smc_rx_recvmsg()
359 	sk = &smc->sk;  in smc_rx_recvmsg()
363 		return smc_rx_recv_urg(smc, msg, len, flags);  in smc_rx_recvmsg()
369 		SMC_STAT_RMB_RX_FULL(smc, !conn->lnk);  in smc_rx_recvmsg()
372 		SMC_STAT_RMB_RX_SIZE_SMALL(smc, !conn->lnk);  in smc_rx_recvmsg()
383 		if (smc_rx_recvmsg_data_available(smc))  in smc_rx_recvmsg()
390 			if (smc_rx_recvmsg_data_available(smc))  in smc_rx_recvmsg()
425 			smc_rx_wait(smc, &timeo, smc_rx_data_available);  in smc_rx_recvmsg()
439 			smc_rx_wait(smc, &timeo, func);  in smc_rx_recvmsg()
448 		    sock_flag(&smc->sk, SOCK_URGINLINE) &&  in smc_rx_recvmsg()
469 							smc);  in smc_rx_recvmsg()
495 			if (msg && smc_rx_update_consumer(smc, cons, copylen))  in smc_rx_recvmsg()
499 		trace_smc_rx_recvmsg(smc, copylen);  in smc_rx_recvmsg()
506 void smc_rx_init(struct smc_sock *smc)  in smc_rx_init()  argument
508 	smc->sk.sk_data_ready = smc_rx_wake_up;  in smc_rx_init()
509 	atomic_set(&smc->conn.splice_pending, 0);  in smc_rx_init()
510 	smc->conn.urg_state = SMC_URG_READ;  in smc_rx_init()