linux-kernel - [PATCH] virtio_net: fix endian-ness for RSS

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Date:   Thu, 11 Aug 2022 08:51:58 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Andrew Melnychenko <andrew@...nix.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: [PATCH] virtio_net: fix endian-ness for RSS

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>
---
 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 d9c434b00e9b..6e9868c860bc 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1208,7 +1208,7 @@ 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:
@@ -1226,7 +1226,7 @@ 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,
-- 
MST