leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

net: ethernet: rmnet: Support for ingress MAPv5 checksum offload

Browse Source 
Adding support for processing of MAPv5 downlink packets.
It involves parsing the Mapv5 packet and checking the csum header
to know whether the hardware has validated the checksum and is
valid or not.

Based on the checksum valid bit the corresponding stats are
incremented and skb->ip_summed is marked either CHECKSUM_UNNECESSARY
or left as CHEKSUM_NONE to let network stack revalidate the checksum
and update the respective snmp stats.

Current MAPV1 header has been modified, the reserved field in the
Mapv1 header is now used for next header indication.

Signed-off-by: Sharath Chandra Vurukala <sharathv@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sharath Chandra Vurukala
2021-06-02 00:58:35 +05:30
committed by David S. Miller
parent 710b797cf6
commit e1d9a90a9b
5 changed files with 96 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
View File

@@ -1,5 +1,5 @@
// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2013-2018, The Linux Foundation. All rights reserved.
/* Copyright (c) 2013-2018, 2021, The Linux Foundation. All rights reserved.
*
* RMNET Data ingress/egress handler
*/
@@ -82,11 +82,16 @@ __rmnet_map_ingress_handler(struct sk_buff *skb,
skb->dev = ep->egress_dev;
/* Subtract MAP header */
skb_pull(skb, sizeof(struct rmnet_map_header));
rmnet_set_skb_proto(skb);
if (port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV4) {
if ((port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV5) &&
(map_header->flags & MAP_NEXT_HEADER_FLAG)) {
if (rmnet_map_process_next_hdr_packet(skb, len))
goto free_skb;
skb_pull(skb, sizeof(*map_header));
rmnet_set_skb_proto(skb);
} else if (port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV4) {
/* Subtract MAP header */
skb_pull(skb, sizeof(*map_header));
rmnet_set_skb_proto(skb);
if (!rmnet_map_checksum_downlink_packet(skb, len + pad))
skb->ip_summed = CHECKSUM_UNNECESSARY;
}