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
15unsigned int efx_tx_limit_len(struct efx_tx_queue *tx_queue,
16			      dma_addr_t dma_addr, unsigned int len);
17
18u8 *efx_tx_get_copy_buffer_limited(struct efx_tx_queue *tx_queue,
19				   struct efx_tx_buffer *buffer, size_t len);
20
21/* What TXQ type will satisfy the checksum offloads required for this skb? */
22static inline unsigned int efx_tx_csum_type_skb(struct sk_buff *skb)
23{
24	if (skb->ip_summed != CHECKSUM_PARTIAL)
25		return 0; /* no checksum offload */
26
27	if (skb->encapsulation &&
28	    skb_checksum_start_offset(skb) == skb_inner_transport_offset(skb)) {
29		/* we only advertise features for IPv4 and IPv6 checksums on
30		 * encapsulated packets, so if the checksum is for the inner
31		 * packet, it must be one of them; no further checking required.
32		 */
33
34		/* Do we also need to offload the outer header checksum? */
35		if (skb_shinfo(skb)->gso_segs > 1 &&
36		    !(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
37		    (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM))
38			return EFX_TXQ_TYPE_OUTER_CSUM | EFX_TXQ_TYPE_INNER_CSUM;
39		return EFX_TXQ_TYPE_INNER_CSUM;
40	}
41
42	/* similarly, we only advertise features for IPv4 and IPv6 checksums,
43	 * so it must be one of them. No need for further checks.
44	 */
45	return EFX_TXQ_TYPE_OUTER_CSUM;
46}
47#endif /* EFX_TX_H */
48