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net: qualcomm: rmnet: Fix incorrect UL checksum offload logic 

The udp_ip4_ind bit is set only for IPv4 UDP non-fragmented packets
so that the hardware can flip the checksum to 0xFFFF if the computed
checksum is 0 per RFC768.

However, this bit had to be set for IPv6 UDP non fragmented packets
as well per hardware requirements. Otherwise, IPv6 UDP packets
with computed checksum as 0 were transmitted by hardware and were
dropped in the network.

In addition to setting this bit for IPv6 UDP, the field is also
appropriately renamed to udp_ind as part of this change.

Fixes: 5eb5f8608e ("net: qualcomm: rmnet: Add support for TX checksum offload")
Cc: Sean Tranchetti <stranche@codeaurora.org>
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Subash Abhinov Kasiviswanathan 2019-07-25 12:07:12 -06:00 committed by David S. Miller
parent 01f5bffad5
commit a7cf3d24ee
2 changed files with 11 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
View File

@ -206,9 +206,9 @@ rmnet_map_ipv4_ul_csum_header(void *iphdr,
ul_header->csum_insert_offset = skb->csum_offset;
ul_header->csum_enabled = 1;
if (ip4h->protocol == IPPROTO_UDP)
ul_header->udp_ip4_ind = 1;
ul_header->udp_ind = 1;
else
ul_header->udp_ip4_ind = 0;
ul_header->udp_ind = 0;
/* Changing remaining fields to network order */
hdr++;
@ -239,6 +239,7 @@ rmnet_map_ipv6_ul_csum_header(void *ip6hdr,
struct rmnet_map_ul_csum_header *ul_header,
struct sk_buff *skb)
{
struct ipv6hdr *ip6h = (struct ipv6hdr *)ip6hdr;
__be16 *hdr = (__be16 *)ul_header, offset;
offset = htons((__force u16)(skb_transport_header(skb) -
@ -246,7 +247,11 @@ rmnet_map_ipv6_ul_csum_header(void *ip6hdr,
ul_header->csum_start_offset = offset;
ul_header->csum_insert_offset = skb->csum_offset;
ul_header->csum_enabled = 1;
ul_header->udp_ip4_ind = 0;
if (ip6h->nexthdr == IPPROTO_UDP)
ul_header->udp_ind = 1;
else
ul_header->udp_ind = 0;
/* Changing remaining fields to network order */
hdr++;
@ -419,7 +424,7 @@ sw_csum:
ul_header->csum_start_offset = 0;
ul_header->csum_insert_offset = 0;
ul_header->csum_enabled = 0;
ul_header->udp_ip4_ind = 0;
ul_header->udp_ind = 0;
priv->stats.csum_sw++;
}

4
include/linux/if_rmnet.h
View File

@ -41,11 +41,11 @@ struct rmnet_map_ul_csum_header {
__be16 csum_start_offset;
#if defined(__LITTLE_ENDIAN_BITFIELD)
u16 csum_insert_offset:14;
u16 udp_ip4_ind:1;
u16 udp_ind:1;
u16 csum_enabled:1;
#elif defined (__BIG_ENDIAN_BITFIELD)
u16 csum_enabled:1;
u16 udp_ip4_ind:1;
u16 udp_ind:1;
u16 csum_insert_offset:14;
#else
#error "Please fix <asm/byteorder.h>"