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net: qualcomm: rmnet: Handle command packets with checksum trailer

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When using the MAPv4 packet format in conjunction with MAP commands,
a dummy DL checksum trailer will be appended to the packet. Before
this packet is sent out as an ACK, the DL checksum trailer needs to be
removed.

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 2018-01-07 11:36:38 -07:00 committed by David S. Miller
parent bbd21b247c
commit 23c76eb740
1 changed files with 15 additions and 2 deletions
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17
drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c
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@ -58,11 +58,24 @@ static u8 rmnet_map_do_flow_control(struct sk_buff *skb,
}
static void rmnet_map_send_ack(struct sk_buff *skb,
unsigned char type)
unsigned char type,
struct rmnet_port *port)
{
struct rmnet_map_control_command *cmd;
int xmit_status;
if (port->data_format & RMNET_INGRESS_FORMAT_MAP_CKSUMV4) {
if (skb->len < sizeof(struct rmnet_map_header) +
RMNET_MAP_GET_LENGTH(skb) +
sizeof(struct rmnet_map_dl_csum_trailer)) {
kfree_skb(skb);
return;
}
skb_trim(skb, skb->len -
sizeof(struct rmnet_map_dl_csum_trailer));
}
skb->protocol = htons(ETH_P_MAP);
cmd = RMNET_MAP_GET_CMD_START(skb);
@ -100,5 +113,5 @@ void rmnet_map_command(struct sk_buff *skb, struct rmnet_port *port)
break;
}
if (rc == RMNET_MAP_COMMAND_ACK)
rmnet_map_send_ack(skb, rc);
rmnet_map_send_ack(skb, rc, port);
}