From: Alex Elder <elder@linaro.org>
To: subashab@codeaurora.org, stranche@codeaurora.org,
davem@davemloft.net, kuba@kernel.org
Cc: bjorn.andersson@linaro.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH net-next 8/8] net: qualcomm: rmnet: IPv6 payload length is simple
Date: Sat, 12 Jun 2021 09:37:36 -0500 [thread overview]
Message-ID: <20210612143736.3498712-9-elder@linaro.org> (raw)
In-Reply-To: <20210612143736.3498712-1-elder@linaro.org>
We don't support any extension headers for IPv6 packets. Extension
headers therefore contribute 0 bytes to the payload length. As a
result we can just use the IPv6 payload length as the length used to
compute the pseudo header checksum for both UDP and TCP messages.
Signed-off-by: Alex Elder <elder@linaro.org>
---
drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
index ed4737d0043d6..a6ce22f60a00c 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
@@ -114,7 +114,6 @@ rmnet_map_ipv6_dl_csum_trailer(struct sk_buff *skb,
__sum16 *csum_field, pseudo_csum;
__sum16 ip6_payload_csum;
__be16 ip_header_csum;
- u32 length;
/* Checksum offload is only supported for UDP and TCP protocols;
* the packet cannot include any IPv6 extension headers
@@ -134,11 +133,9 @@ rmnet_map_ipv6_dl_csum_trailer(struct sk_buff *skb,
ip_header_csum = (__force __be16)ip_fast_csum(ip6h, sizeof(*ip6h) / 4);
ip6_payload_csum = csum16_sub(csum_trailer->csum_value, ip_header_csum);
- length = (ip6h->nexthdr == IPPROTO_UDP) ?
- ntohs(((struct udphdr *)txporthdr)->len) :
- ntohs(ip6h->payload_len);
pseudo_csum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
- length, ip6h->nexthdr, 0);
+ ntohs(ip6h->payload_len),
+ ip6h->nexthdr, 0);
/* It's sufficient to compare the IP payload checksum with the
* negated pseudo checksum to determine whether the packet
--
2.27.0
prev parent reply other threads:[~2021-06-12 14:38 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-12 14:37 [PATCH net-next 0/8] net: qualcomm: rmnet: MAPv4 download checksum cleanup, part 2 Alex Elder
2021-06-12 14:37 ` [PATCH net-next 1/8] net: qualcomm: rmnet: remove some local variables Alex Elder
2021-06-12 14:37 ` [PATCH net-next 2/8] net: qualcomm: rmnet: rearrange some NOTs Alex Elder
2021-06-12 14:37 ` [PATCH net-next 3/8] net: qualcomm: rmnet: show that an intermediate sum is zero Alex Elder
2021-06-12 14:37 ` [PATCH net-next 4/8] net: qualcomm: rmnet: return earlier for bad checksum Alex Elder
2021-06-12 14:37 ` [PATCH net-next 5/8] net: qualcomm: rmnet: remove unneeded code Alex Elder
2021-06-12 14:37 ` [PATCH net-next 6/8] net: qualcomm: rmnet: trailer value is a checksum Alex Elder
2021-06-12 14:37 ` [PATCH net-next 7/8] net: qualcomm: rmnet: drop some unary NOTs Alex Elder
2021-06-12 14:37 ` Alex Elder [this message]
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