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? */ efx_tx_csum_type_skb(struct sk_buff * 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