1/* SPDX-License-Identifier: GPL-2.0-only */
2/****************************************************************************
3 * Driver for Solarflare network controllers and boards
4 * Copyright 2005-2006 Fen Systems Ltd.
5 * Copyright 2006-2015 Solarflare Communications Inc.
6 */
7
8#ifndef EFX_TX_H
9#define EFX_TX_H
10
11#include <linux/types.h>
12
13/* Driver internal tx-path related declarations. */
14/* What TXQ type will satisfy the checksum offloads required for this skb? */
15static inline unsigned int efx_tx_csum_type_skb(struct sk_buff *skb)
16{
17	if (skb->ip_summed != CHECKSUM_PARTIAL)
18		return 0; /* no checksum offload */
19
20	if (skb->encapsulation &&
21	    skb_checksum_start_offset(skb) == skb_inner_transport_offset(skb)) {
22		/* we only advertise features for IPv4 and IPv6 checksums on
23		 * encapsulated packets, so if the checksum is for the inner
24		 * packet, it must be one of them; no further checking required.
25		 */
26
27		/* Do we also need to offload the outer header checksum? */
28		if (skb_shinfo(skb)->gso_segs > 1 &&
29		    !(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
30		    (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM))
31			return EFX_TXQ_TYPE_OUTER_CSUM | EFX_TXQ_TYPE_INNER_CSUM;
32		return EFX_TXQ_TYPE_INNER_CSUM;
33	}
34
35	/* similarly, we only advertise features for IPv4 and IPv6 checksums,
36	 * so it must be one of them. No need for further checks.
37	 */
38	return EFX_TXQ_TYPE_OUTER_CSUM;
39}
40#endif /* EFX_TX_H */
41