drivers/net/ethernet/sfc/siena/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 /* What TXQ type will satisfy the checksum offloads required for this skb? */
  15 static 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 */