[PATCH 4.19 230/321] net/smc: fix byte_order for rx_curs_confirmed

Greg Kroah-Hartman
2019-12-03T23:02:16Z

From: Ursula Braun <ubraun@linux.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@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.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