linux-kernel - [PATCH 5.19 208/365] virtio_net: fix endian-ness for RSS

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Message-Id: <20220823080126.892343887@linuxfoundation.org>
Date:   Tue, 23 Aug 2022 10:01:49 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Andrew Melnychenko" <andrew@...nix.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.19 208/365] virtio_net: fix endian-ness for RSS

From: Michael S. Tsirkin <mst@...hat.com>

commit 95bb633048fab742230eb2cdf20b8e2676240a54 upstream.

Using native endian-ness for device supplied fields is wrong
on BE platforms. Sparse warns about this.

Fixes: 91f41f01d219 ("drivers/net/virtio_net: Added RSS hash report.")
Cc: "Andrew Melnychenko" <andrew@...nix.com>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/virtio_net.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 3b3eebad3977..d4e0a775b1ba 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1199,7 +1199,7 @@ static void virtio_skb_set_hash(const struct virtio_net_hdr_v1_hash *hdr_hash,
 	if (!hdr_hash || !skb)
 		return;
 
-	switch ((int)hdr_hash->hash_report) {
+	switch (__le16_to_cpu(hdr_hash->hash_report)) {
 	case VIRTIO_NET_HASH_REPORT_TCPv4:
 	case VIRTIO_NET_HASH_REPORT_UDPv4:
 	case VIRTIO_NET_HASH_REPORT_TCPv6:
@@ -1217,7 +1217,7 @@ static void virtio_skb_set_hash(const struct virtio_net_hdr_v1_hash *hdr_hash,
 	default:
 		rss_hash_type = PKT_HASH_TYPE_NONE;
 	}
-	skb_set_hash(skb, (unsigned int)hdr_hash->hash_value, rss_hash_type);
+	skb_set_hash(skb, __le32_to_cpu(hdr_hash->hash_value), rss_hash_type);
 }
 
 static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
-- 
2.37.2