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net: stmmac: add TSO check for header length

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According to the STM32MP151 documentation which covers dwmac v4.2, the
hardware TSO feature can handle header lengths up to a maximum of 1023
bytes.

Add a .ndo_features_check() method implementation to check the header
length meets these requirements, otherwise fall back to software GSO.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/E1w7ptO-0000000EatC-39il@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Russell King (Oracle) 2026-04-01 08:21:34 +01:00 committed by Jakub Kicinski
parent f799b5dab9
commit 6732e474f8
1 changed files with 16 additions and 1 deletions
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17
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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@ -4385,6 +4385,20 @@ static size_t stmmac_tso_header_size(struct sk_buff *skb)
return size;
}
/* STM32MP151 (dwmac v4.2) and STM32MP25xx (dwmac v5.3) states for TDES2 normal
* (read format) descriptor that the maximum header length supported for the
* TSO feature is 1023 bytes.
*
* While IPv4 is limited to MAC+VLAN+IPv4+ext+TCP+ext = 138 bytes, the IPv6
* extension headers aren't similarly limited.
*/
static bool stmmac_tso_valid_packet(struct sk_buff *skb)
{
size_t header_len = stmmac_tso_header_size(skb);
return header_len <= 1023;
}
/**
* stmmac_tso_xmit - Tx entry point of the driver for oversized frames (TSO)
* @skb : the socket buffer
@ -4945,7 +4959,8 @@ static netdev_features_t stmmac_features_check(struct sk_buff *skb,
if (skb_is_gso(skb)) {
queue = skb_get_queue_mapping(skb);
if (!stmmac_tso_channel_permitted(netdev_priv(dev), queue))
if (!stmmac_tso_channel_permitted(netdev_priv(dev), queue) ||
!stmmac_tso_valid_packet(skb))
features &= ~NETIF_F_GSO_MASK;
}