/* SPDX-License-Identifier: GPL-2.0-only */
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/****************************************************************************
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* Driver for Solarflare network controllers and boards
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* Copyright 2005-2006 Fen Systems Ltd.
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* Copyright 2006-2015 Solarflare Communications Inc.
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*/
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#ifndef EFX_TX_H
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#define EFX_TX_H
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#include <linux/types.h>
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/* Driver internal tx-path related declarations. */
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unsigned int efx_tx_limit_len(struct efx_tx_queue *tx_queue,
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dma_addr_t dma_addr, unsigned int len);
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u8 *efx_tx_get_copy_buffer_limited(struct efx_tx_queue *tx_queue,
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struct efx_tx_buffer *buffer, size_t len);
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/* What TXQ type will satisfy the checksum offloads required for this skb? */
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static inline unsigned int efx_tx_csum_type_skb(struct sk_buff *skb)
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{
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if (skb->ip_summed != CHECKSUM_PARTIAL)
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return 0; /* no checksum offload */
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if (skb->encapsulation &&
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skb_checksum_start_offset(skb) == skb_inner_transport_offset(skb)) {
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/* we only advertise features for IPv4 and IPv6 checksums on
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* encapsulated packets, so if the checksum is for the inner
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* packet, it must be one of them; no further checking required.
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*/
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/* Do we also need to offload the outer header checksum? */
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if (skb_shinfo(skb)->gso_segs > 1 &&
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!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
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(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM))
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return EFX_TXQ_TYPE_OUTER_CSUM | EFX_TXQ_TYPE_INNER_CSUM;
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return EFX_TXQ_TYPE_INNER_CSUM;
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}
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/* similarly, we only advertise features for IPv4 and IPv6 checksums,
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* so it must be one of them. No need for further checks.
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*/
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return EFX_TXQ_TYPE_OUTER_CSUM;
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}
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#endif /* EFX_TX_H */
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