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1/* SPDX-License-Identifier: GPL-2.0-only */2/****************************************************************************3 * Driver for Solarflare network controllers and boards4 * Copyright 2005-2006 Fen Systems Ltd.5 * Copyright 2006-2015 Solarflare Communications Inc.6 */7 8#ifndef EFX_TX_H9#define EFX_TX_H10 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 on23 * encapsulated packets, so if the checksum is for the inner24 * 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