From: Alex Elder <elder@linaro.org>
Date: Fri, 11 Jun 2021 19:05:22 +0000 (-0500)
Subject: net: qualcomm: rmnet: use ip_is_fragment()
X-Git-Tag: v5.15.73~11674^2~200^2~7
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e4517d8a7f07b18f4f0e68940e2822a1b92b471f;p=platform%2Fkernel%2Flinux-rpi.git

net: qualcomm: rmnet: use ip_is_fragment()

In rmnet_map_ipv4_dl_csum_trailer() use ip_is_fragment() to
determine whether a socket buffer contains a packet fragment.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
index cecf72be5102..34bd1a98a101 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
@@ -50,8 +50,9 @@ rmnet_map_ipv4_dl_csum_trailer(struct sk_buff *skb,
 	__be16 addend;
 
 	ip4h = (struct iphdr *)(skb->data);
-	if ((ntohs(ip4h->frag_off) & IP_MF) ||
-	    ((ntohs(ip4h->frag_off) & IP_OFFSET) > 0)) {
+
+	/* We don't support checksum offload on IPv4 fragments */
+	if (ip_is_fragment(ip4h)) {
 		priv->stats.csum_fragmented_pkt++;
 		return -EOPNOTSUPP;
 	}