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net: stmmac: add GSO MSS checks

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Add GSO MSS checks to stmmac_features_check().

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/E1w7ptT-0000000EatI-3feh@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Russell King (Oracle) 2026-04-01 08:21:39 +01:00 committed by Jakub Kicinski
parent 6732e474f8
commit c05a81cbee
1 changed files with 8 additions and 1 deletions
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9
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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@ -4391,12 +4391,19 @@ static size_t stmmac_tso_header_size(struct sk_buff *skb)
*
* While IPv4 is limited to MAC+VLAN+IPv4+ext+TCP+ext = 138 bytes, the IPv6
* extension headers aren't similarly limited.
*
* Fall back to software GSO for these skbs. Also check that the MSS is >=
* the recommended 64 bytes (documented in ETH_DMACxCR register description),
* and that a the header plus MSS is not larger than 16383 (documented in
* "Building the Descriptor and the packet for the TSO feature").
*/
static bool stmmac_tso_valid_packet(struct sk_buff *skb)
{
size_t header_len = stmmac_tso_header_size(skb);
unsigned int gso_size = skb_shinfo(skb)->gso_size;
return header_len <= 1023;
return header_len <= 1023 && gso_size >= 64 &&
header_len + gso_size < 16383;
}
/**