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Commit fc942787 authored by Sharath Chandra Vurukala's avatar Sharath Chandra Vurukala
Browse files

net: qualcomm: rmnet: Add workaround for hardware 



Add workaround for hardware specific behavior to
compute partial checksum.

Change-Id: I57858d3fe8c3fc142fd6959d72fcd2fd68398cd0
Signed-off-by: default avatarSubash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Signed-off-by: default avatarSharath Chandra Vurukala <sharathv@codeaurora.org>
parent 2d6a930c

drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c

+38 −4
Original line number Diff line number Diff line 
/* Copyright (c) 2013-2019, The Linux Foundation. All rights reserved.

/* Copyright (c) 2013-2020, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and
@@ -18,6 +18,7 @@ 
#include <linux/if_arp.h>

#include <linux/ip.h>

#include <linux/ipv6.h>

#include <net/ip6_checksum.h>

#include <net/sock.h>

#include <linux/tracepoint.h>

#include "rmnet_private.h"
@@ -213,7 +214,12 @@ static void rmnet_deliver_skb_list(struct sk_buff_head *head, 
static void rmnet_ip_route_rcv(struct sk_buff *skb, struct rmnet_port *port)

{

	struct rmnet_endpoint *ep;



	struct ipv6hdr *ip6h;

	int ip_len;

	__sum16 pseudo;

	__be16 frag_off;

	u16 pkt_len;

	u8 proto;

	skb_reset_transport_header(skb);

	skb_reset_network_header(skb);
@@ -229,10 +235,38 @@ static void rmnet_ip_route_rcv(struct sk_buff *skb, struct rmnet_port *port) 
		break;

	case RMNET_IP_VERSION_6:

		skb->protocol = htons(ETH_P_IPV6);

		ep = rmnet_get_ip6_route_endpoint(port,

						  &(ipv6_hdr(skb)->daddr));

		ip6h = ipv6_hdr(skb);

		ep = rmnet_get_ip6_route_endpoint(port, &ip6h->daddr);

		if (!ep)

			goto drop_skb;



		proto = ip6h->nexthdr;

		ip_len = ipv6_skip_exthdr(skb, sizeof(*ip6h), &proto,

					  &frag_off);

		if (ip_len < 0 || frag_off)

			break;



		pkt_len = skb->len - ip_len;

		pseudo = ~csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, pkt_len,

					proto, 0);

		if (proto == IPPROTO_UDP) {

			struct udphdr *up = (struct udphdr *)

					(rmnet_map_data_ptr(skb) + ip_len);



			up->check = pseudo;

			skb->csum_offset = offsetof(struct udphdr, check);

		} else if (proto == IPPROTO_TCP) {

			struct tcphdr *tp = (struct tcphdr *)

					(rmnet_map_data_ptr(skb) + ip_len);



			tp->check = pseudo;

			skb->csum_offset = offsetof(struct tcphdr, check);

		} else {

			break;

		}



		skb->ip_summed = CHECKSUM_PARTIAL;

		skb->csum_start = skb->data + ip_len - skb->head;

		break;

	default:

		goto drop_skb;