linux-kernel - [PATCH AUTOSEL 4.19 186/219] net/smc: fix byte_order for rx_curs

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Message-Id: <20191122054911.1750-179-sashal@kernel.org>
Date:   Fri, 22 Nov 2019 00:48:38 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Ursula Braun <ubraun@...ux.ibm.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>, linux-s390@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 186/219] net/smc: fix byte_order for rx_curs_confirmed

From: Ursula Braun <ubraun@...ux.ibm.com>

[ Upstream commit ccc8ca9b90acb45a3309f922b2591b07b4e070ec ]

The recent change in the rx_curs_confirmed assignment disregards
byte order, which causes problems on little endian architectures.
This patch fixes it.

Fixes: b8649efad879 ("net/smc: fix sender_free computation") (net-tree)
Signed-off-by: Ursula Braun <ubraun@...ux.ibm.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/smc/smc_cdc.c |  4 +---
 net/smc/smc_cdc.h | 19 ++++++++++---------
 2 files changed, 11 insertions(+), 12 deletions(-)

diff --git a/net/smc/smc_cdc.c b/net/smc/smc_cdc.c
index 8f691b5a44ddf..333e4353498f8 100644
--- a/net/smc/smc_cdc.c
+++ b/net/smc/smc_cdc.c
@@ -106,9 +106,7 @@ int smc_cdc_msg_send(struct smc_connection *conn,
 
 	conn->tx_cdc_seq++;
 	conn->local_tx_ctrl.seqno = conn->tx_cdc_seq;
-	smc_host_msg_to_cdc((struct smc_cdc_msg *)wr_buf,
-			    &conn->local_tx_ctrl, conn);
-	smc_curs_copy(&cfed, &((struct smc_host_cdc_msg *)wr_buf)->cons, conn);
+	smc_host_msg_to_cdc((struct smc_cdc_msg *)wr_buf, conn, &cfed);
 	rc = smc_wr_tx_send(link, (struct smc_wr_tx_pend_priv *)pend);
 	if (!rc)
 		smc_curs_copy(&conn->rx_curs_confirmed, &cfed, conn);
diff --git a/net/smc/smc_cdc.h b/net/smc/smc_cdc.h
index 2377a51772d51..34d2e1450320a 100644
--- a/net/smc/smc_cdc.h
+++ b/net/smc/smc_cdc.h
@@ -186,26 +186,27 @@ static inline int smc_curs_diff_large(unsigned int size,
 
 static inline void smc_host_cursor_to_cdc(union smc_cdc_cursor *peer,
 					  union smc_host_cursor *local,
+					  union smc_host_cursor *save,
 					  struct smc_connection *conn)
 {
-	union smc_host_cursor temp;
-
-	smc_curs_copy(&temp, local, conn);
-	peer->count = htonl(temp.count);
-	peer->wrap = htons(temp.wrap);
+	smc_curs_copy(save, local, conn);
+	peer->count = htonl(save->count);
+	peer->wrap = htons(save->wrap);
 	/* peer->reserved = htons(0); must be ensured by caller */
 }
 
 static inline void smc_host_msg_to_cdc(struct smc_cdc_msg *peer,
-				       struct smc_host_cdc_msg *local,
-				       struct smc_connection *conn)
+				       struct smc_connection *conn,
+				       union smc_host_cursor *save)
 {
+	struct smc_host_cdc_msg *local = &conn->local_tx_ctrl;
+
 	peer->common.type = local->common.type;
 	peer->len = local->len;
 	peer->seqno = htons(local->seqno);
 	peer->token = htonl(local->token);
-	smc_host_cursor_to_cdc(&peer->prod, &local->prod, conn);
-	smc_host_cursor_to_cdc(&peer->cons, &local->cons, conn);
+	smc_host_cursor_to_cdc(&peer->prod, &local->prod, save, conn);
+	smc_host_cursor_to_cdc(&peer->cons, &local->cons, save, conn);
 	peer->prod_flags = local->prod_flags;
 	peer->conn_state_flags = local->conn_state_flags;
 }
-- 
2.20.1