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tcp: Fix conditions to determine checksum offload

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In tcp_send_sendpage and tcp_sendmsg we check the route capabilities to
determine if checksum offload can be performed. This check currently
does not take the IP protocol into account for devices that advertise
only one of NETIF_F_IPV6_CSUM or NETIF_F_IP_CSUM. This patch adds a
function to check capabilities for checksum offload with a socket
called sk_check_csum_caps. This function checks for specific IPv4 or
IPv6 offload support based on the family of the socket.

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert
2015-12-14 11:19:45 -08:00
committed by David S. Miller
parent c8cd0989bd
commit 9a49850d0a
2 changed files with 11 additions and 2 deletions
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4
net/ipv4/tcp.c
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@@ -1018,7 +1018,7 @@ int tcp_sendpage(struct sock *sk, struct page *page, int offset,
ssize_t res;
if (!(sk->sk_route_caps & NETIF_F_SG) ||
!(sk->sk_route_caps & NETIF_F_CSUM_MASK))
!sk_check_csum_caps(sk))
return sock_no_sendpage(sk->sk_socket, page, offset, size,
flags);
@@ -1175,7 +1175,7 @@ new_segment:
/*
* Check whether we can use HW checksum.
*/
if (sk->sk_route_caps & NETIF_F_CSUM_MASK)
if (sk_check_csum_caps(sk))
skb->ip_summed = CHECKSUM_PARTIAL;
skb_entail(sk, skb);