sfc: select inner-csum-offload TX queues for skbs that need it
[linux-2.6-microblaze.git] / drivers / net / ethernet / sfc / tx.h
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
15 unsigned int efx_tx_limit_len(struct efx_tx_queue *tx_queue,
16                               dma_addr_t dma_addr, unsigned int len);
17
18 u8 *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? */
22 static 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 */