linux-kernel - [PATCH net-next 1/1] Enter smc_tx_wait when the tx length exceeds the available space

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Message-ID: <20241226122217.1125-2-liqiang64@huawei.com>
Date: Thu, 26 Dec 2024 20:22:17 +0800
From: liqiang <liqiang64@...wei.com>
To: <wenjia@...ux.ibm.com>, <jaka@...ux.ibm.com>, <alibuda@...ux.alibaba.com>,
	<tonylu@...ux.alibaba.com>, <guwen@...ux.alibaba.com>
CC: <linux-s390@...r.kernel.org>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <luanjianhai@...wei.com>,
	<zhangxuzhou4@...wei.com>, <dengguangxing@...wei.com>,
	<gaochao24@...wei.com>, <liqiang64@...wei.com>
Subject: [PATCH net-next 1/1] Enter smc_tx_wait when the tx length exceeds the available space

The variable send_done records the number of bytes that have been 
successfully sent in the context of the code. It is more reasonable 
to rename it to sent_bytes here.

Another modification point is that if the ring buf is full after 
sendmsg has sent part of the data, the current code will return 
directly without entering smc_tx_wait, so the judgment of send_done 
in front of smc_tx_wait is removed.

Signed-off-by: liqiang <liqiang64@...wei.com>
---
 net/smc/smc_tx.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/net/smc/smc_tx.c b/net/smc/smc_tx.c
index 214ac3cbcf9a..6ecabc10793c 100644
--- a/net/smc/smc_tx.c
+++ b/net/smc/smc_tx.c
@@ -180,7 +180,7 @@ static bool smc_tx_should_cork(struct smc_sock *smc, struct msghdr *msg)
  */
 int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len)
 {
-	size_t copylen, send_done = 0, send_remaining = len;
+	size_t copylen, sent_bytes = 0, send_remaining = len;
 	size_t chunk_len, chunk_off, chunk_len_sum;
 	struct smc_connection *conn = &smc->conn;
 	union smc_host_cursor prep;
@@ -216,14 +216,12 @@ int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len)
 		    conn->killed)
 			return -EPIPE;
 		if (smc_cdc_rxed_any_close(conn))
-			return send_done ?: -ECONNRESET;
+			return sent_bytes ?: -ECONNRESET;
 
 		if (msg->msg_flags & MSG_OOB)
 			conn->local_tx_ctrl.prod_flags.urg_data_pending = 1;
 
 		if (!atomic_read(&conn->sndbuf_space) || conn->urg_tx_pend) {
-			if (send_done)
-				return send_done;
 			rc = smc_tx_wait(smc, msg->msg_flags);
 			if (rc)
 				goto out_err;
@@ -250,11 +248,11 @@ int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len)
 					     msg, chunk_len);
 			if (rc) {
 				smc_sndbuf_sync_sg_for_device(conn);
-				if (send_done)
-					return send_done;
+				if (sent_bytes)
+					return sent_bytes;
 				goto out_err;
 			}
-			send_done += chunk_len;
+			sent_bytes += chunk_len;
 			send_remaining -= chunk_len;
 
 			if (chunk_len_sum == copylen)
@@ -287,7 +285,7 @@ int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len)
 		trace_smc_tx_sendmsg(smc, copylen);
 	} /* while (msg_data_left(msg)) */
 
-	return send_done;
+	return sent_bytes;
 
 out_err:
 	rc = sk_stream_error(sk, msg->msg_flags, rc);
-- 
2.43.0