1 files changed, 167 insertions, 39 deletions

diff --git a/net/smc/smc_rx.c b/net/smc/smc_rx.c
index eff4e0d0bb31..290a434471d1 100644
--- a/net/smc/smc_rx.c
+++ b/net/smc/smc_rx.c
@@ -22,11 +22,10 @@
 #include "smc_tx.h" /* smc_tx_consumer_update() */
 #include "smc_rx.h"
 
-/* callback implementation for sk.sk_data_ready()
- * to wakeup rcvbuf consumers that blocked with smc_rx_wait_data().
+/* callback implementation to wakeup consumers blocked with smc_rx_wait().
  * indirectly called by smc_cdc_msg_recv_action().
  */
-static void smc_rx_data_ready(struct sock *sk)
+static void smc_rx_wake_up(struct sock *sk)
 {
 	struct socket_wq *wq;
 
@@ -44,28 +43,140 @@ static void smc_rx_data_ready(struct sock *sk)
 	rcu_read_unlock();
 }
 
+/* Update consumer cursor
+ *   @conn   connection to update
+ *   @cons   consumer cursor
+ *   @len    number of Bytes consumed
+ */
+static void smc_rx_update_consumer(struct smc_connection *conn,
+				   union smc_host_cursor cons, size_t len)
+{
+	smc_curs_add(conn->rmb_desc->len, &cons, len);
+	smc_curs_write(&conn->local_tx_ctrl.cons, smc_curs_read(&cons, conn),
+		       conn);
+	/* send consumer cursor update if required */
+	/* similar to advertising new TCP rcv_wnd if required */
+	smc_tx_consumer_update(conn);
+}
+
+struct smc_spd_priv {
+	struct smc_sock *smc;
+	size_t		 len;
+};
+
+static void smc_rx_pipe_buf_release(struct pipe_inode_info *pipe,
+				    struct pipe_buffer *buf)
+{
+	struct smc_spd_priv *priv = (struct smc_spd_priv *)buf->private;
+	struct smc_sock *smc = priv->smc;
+	struct smc_connection *conn;
+	union smc_host_cursor cons;
+	struct sock *sk = &smc->sk;
+
+	if (sk->sk_state == SMC_CLOSED ||
+	    sk->sk_state == SMC_PEERFINCLOSEWAIT ||
+	    sk->sk_state == SMC_APPFINCLOSEWAIT)
+		goto out;
+	conn = &smc->conn;
+	lock_sock(sk);
+	smc_curs_write(&cons, smc_curs_read(&conn->local_tx_ctrl.cons, conn),
+		       conn);
+	smc_rx_update_consumer(conn, cons, priv->len);
+	release_sock(sk);
+	if (atomic_sub_and_test(priv->len, &conn->splice_pending))
+		smc_rx_wake_up(sk);
+out:
+	kfree(priv);
+	put_page(buf->page);
+	sock_put(sk);
+}
+
+static int smc_rx_pipe_buf_nosteal(struct pipe_inode_info *pipe,
+				   struct pipe_buffer *buf)
+{
+	return 1;
+}
+
+static const struct pipe_buf_operations smc_pipe_ops = {
+	.can_merge = 0,
+	.confirm = generic_pipe_buf_confirm,
+	.release = smc_rx_pipe_buf_release,
+	.steal = smc_rx_pipe_buf_nosteal,
+	.get = generic_pipe_buf_get
+};
+
+static void smc_rx_spd_release(struct splice_pipe_desc *spd,
+			       unsigned int i)
+{
+	put_page(spd->pages[i]);
+}
+
+static int smc_rx_splice(struct pipe_inode_info *pipe, char *src, size_t len,
+			 struct smc_sock *smc)
+{
+	struct splice_pipe_desc spd;
+	struct partial_page partial;
+	struct smc_spd_priv *priv;
+	struct page *page;
+	int bytes;
+
+	page = virt_to_page(smc->conn.rmb_desc->cpu_addr);
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+	priv->len = len;
+	priv->smc = smc;
+	partial.offset = src - (char *)smc->conn.rmb_desc->cpu_addr;
+	partial.len = len;
+	partial.private = (unsigned long)priv;
+
+	spd.nr_pages_max = 1;
+	spd.nr_pages = 1;
+	spd.pages = &page;
+	spd.partial = &partial;
+	spd.ops = &smc_pipe_ops;
+	spd.spd_release = smc_rx_spd_release;
+
+	bytes = splice_to_pipe(pipe, &spd);
+	if (bytes > 0) {
+		sock_hold(&smc->sk);
+		get_page(smc->conn.rmb_desc->pages);
+		atomic_add(bytes, &smc->conn.splice_pending);
+	}
+
+	return bytes;
+}
+
+static int smc_rx_data_available_and_no_splice_pend(struct smc_connection *conn)
+{
+	return atomic_read(&conn->bytes_to_rcv) &&
+	       !atomic_read(&conn->splice_pending);
+}
+
 /* blocks rcvbuf consumer until >=len bytes available or timeout or interrupted
  *   @smc    smc socket
  *   @timeo  pointer to max seconds to wait, pointer to value 0 for no timeout
+ *   @fcrit  add'l criterion to evaluate as function pointer
  * Returns:
  * 1 if at least 1 byte available in rcvbuf or if socket error/shutdown.
  * 0 otherwise (nothing in rcvbuf nor timeout, e.g. interrupted).
  */
-static int smc_rx_wait_data(struct smc_sock *smc, long *timeo)
+int smc_rx_wait(struct smc_sock *smc, long *timeo,
+		int (*fcrit)(struct smc_connection *conn))
 {
 	DEFINE_WAIT_FUNC(wait, woken_wake_function);
 	struct smc_connection *conn = &smc->conn;
 	struct sock *sk = &smc->sk;
 	int rc;
 
-	if (atomic_read(&conn->bytes_to_rcv))
+	if (fcrit(conn))
 		return 1;
 	sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
 	add_wait_queue(sk_sleep(sk), &wait);
 	rc = sk_wait_event(sk, timeo,
 			   sk->sk_err ||
 			   sk->sk_shutdown & RCV_SHUTDOWN ||
-			   atomic_read(&conn->bytes_to_rcv) ||
+			   fcrit(conn) ||
 			   smc_cdc_rxed_any_close_or_senddone(conn),
 			   &wait);
 	remove_wait_queue(sk_sleep(sk), &wait);
@@ -73,19 +184,25 @@ static int smc_rx_wait_data(struct smc_sock *smc, long *timeo)
 	return rc;
 }
 
-/* rcvbuf consumer: main API called by socket layer.
- * called under sk lock.
+/* smc_rx_recvmsg - receive data from RMBE
+ * @msg:	copy data to receive buffer
+ * @pipe:	copy data to pipe if set - indicates splice() call
+ *
+ * rcvbuf consumer: main API called by socket layer.
+ * Called under sk lock.
  */
-int smc_rx_recvmsg(struct smc_sock *smc, struct msghdr *msg, size_t len,
-		   int flags)
+int smc_rx_recvmsg(struct smc_sock *smc, struct msghdr *msg,
+		   struct pipe_inode_info *pipe, size_t len, int flags)
 {
 	size_t copylen, read_done = 0, read_remaining = len;
 	size_t chunk_len, chunk_off, chunk_len_sum;
 	struct smc_connection *conn = &smc->conn;
+	int (*func)(struct smc_connection *conn);
 	union smc_host_cursor cons;
 	int readable, chunk;
 	char *rcvbuf_base;
 	struct sock *sk;
+	int splbytes;
 	long timeo;
 	int target;		/* Read at least these many bytes */
 	int rc;
@@ -101,37 +218,32 @@ int smc_rx_recvmsg(struct smc_sock *smc, struct msghdr *msg, size_t len,
 	timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
 	target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
 
-	msg->msg_namelen = 0;
 	/* we currently use 1 RMBE per RMB, so RMBE == RMB base addr */
 	rcvbuf_base = conn->rmb_desc->cpu_addr;
 
 	do { /* while (read_remaining) */
-		if (read_done >= target)
+		if (read_done >= target || (pipe && read_done))
 			break;
 
 		if (atomic_read(&conn->bytes_to_rcv))
 			goto copy;
 
+		if (sk->sk_shutdown & RCV_SHUTDOWN ||
+		    smc_cdc_rxed_any_close_or_senddone(conn) ||
+		    conn->local_tx_ctrl.conn_state_flags.peer_conn_abort)
+			break;
+
 		if (read_done) {
 			if (sk->sk_err ||
 			    sk->sk_state == SMC_CLOSED ||
-			    sk->sk_shutdown & RCV_SHUTDOWN ||
 			    !timeo ||
-			    signal_pending(current) ||
-			    smc_cdc_rxed_any_close_or_senddone(conn) ||
-			    conn->local_tx_ctrl.conn_state_flags.
-			    peer_conn_abort)
+			    signal_pending(current))
 				break;
 		} else {
 			if (sk->sk_err) {
 				read_done = sock_error(sk);
 				break;
 			}
-			if (sk->sk_shutdown & RCV_SHUTDOWN ||
-			    smc_cdc_rxed_any_close_or_senddone(conn) ||
-			    conn->local_tx_ctrl.conn_state_flags.
-			    peer_conn_abort)
-				break;
 			if (sk->sk_state == SMC_CLOSED) {
 				if (!sock_flag(sk, SOCK_DONE)) {
 					/* This occurs when user tries to read
@@ -150,32 +262,52 @@ int smc_rx_recvmsg(struct smc_sock *smc, struct msghdr *msg, size_t len,
 				return -EAGAIN;
 		}
 
-		if (!atomic_read(&conn->bytes_to_rcv)) {
-			smc_rx_wait_data(smc, &timeo);
+		if (!smc_rx_data_available(conn)) {
+			smc_rx_wait(smc, &timeo, smc_rx_data_available);
 			continue;
 		}
 
 copy:
 		/* initialize variables for 1st iteration of subsequent loop */
-		/* could be just 1 byte, even after smc_rx_wait_data above */
+		/* could be just 1 byte, even after waiting on data above */
 		readable = atomic_read(&conn->bytes_to_rcv);
+		splbytes = atomic_read(&conn->splice_pending);
+		if (!readable || (msg && splbytes)) {
+			if (splbytes)
+				func = smc_rx_data_available_and_no_splice_pend;
+			else
+				func = smc_rx_data_available;
+			smc_rx_wait(smc, &timeo, func);
+			continue;
+		}
+
 		/* not more than what user space asked for */
 		copylen = min_t(size_t, read_remaining, readable);
 		smc_curs_write(&cons,
 			       smc_curs_read(&conn->local_tx_ctrl.cons, conn),
 			       conn);
+		/* subsequent splice() calls pick up where previous left */
+		if (splbytes)
+			smc_curs_add(conn->rmb_desc->len, &cons, splbytes);
 		/* determine chunks where to read from rcvbuf */
 		/* either unwrapped case, or 1st chunk of wrapped case */
-		chunk_len = min_t(size_t,
-				  copylen, conn->rmbe_size - cons.count);
+		chunk_len = min_t(size_t, copylen, conn->rmb_desc->len -
+				  cons.count);
 		chunk_len_sum = chunk_len;
 		chunk_off = cons.count;
 		smc_rmb_sync_sg_for_cpu(conn);
 		for (chunk = 0; chunk < 2; chunk++) {
 			if (!(flags & MSG_TRUNC)) {
-				rc = memcpy_to_msg(msg, rcvbuf_base + chunk_off,
-						   chunk_len);
-				if (rc) {
+				if (msg) {
+					rc = memcpy_to_msg(msg, rcvbuf_base +
+							   chunk_off,
+							   chunk_len);
+				} else {
+					rc = smc_rx_splice(pipe, rcvbuf_base +
+							chunk_off, chunk_len,
+							smc);
+				}
+				if (rc < 0) {
 					if (!read_done)
 						read_done = -EFAULT;
 					smc_rmb_sync_sg_for_device(conn);
@@ -196,18 +328,13 @@ copy:
 
 		/* update cursors */
 		if (!(flags & MSG_PEEK)) {
-			smc_curs_add(conn->rmbe_size, &cons, copylen);
 			/* increased in recv tasklet smc_cdc_msg_rcv() */
 			smp_mb__before_atomic();
 			atomic_sub(copylen, &conn->bytes_to_rcv);
-			/* guarantee 0 <= bytes_to_rcv <= rmbe_size */
+			/* guarantee 0 <= bytes_to_rcv <= rmb_desc->len */
 			smp_mb__after_atomic();
-			smc_curs_write(&conn->local_tx_ctrl.cons,
-				       smc_curs_read(&cons, conn),
-				       conn);
-			/* send consumer cursor update if required */
-			/* similar to advertising new TCP rcv_wnd if required */
-			smc_tx_consumer_update(conn);
+			if (msg)
+				smc_rx_update_consumer(conn, cons, copylen);
 		}
 	} while (read_remaining);
 out:
@@ -217,5 +344,6 @@ out:
 /* Initialize receive properties on connection establishment. NB: not __init! */
 void smc_rx_init(struct smc_sock *smc)
 {
-	smc->sk.sk_data_ready = smc_rx_data_ready;
+	smc->sk.sk_data_ready = smc_rx_wake_up;
+	atomic_set(&smc->conn.splice_pending, 0);
 }