From: Pieter Van Trappen Date: Mon, 12 Aug 2024 09:06:55 +0000 (+0200) Subject: net: macb: increase max_mtu for oversized frames X-Git-Tag: v6.12-rc1~232^2~254 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=7cb43579641dc437941782b473387c6f8bbc1d25;p=thirdparty%2Fkernel%2Flinux.git net: macb: increase max_mtu for oversized frames Increase max_mtu from 1500 to 1518 bytes when not configured for jumbo frames. Use 1536 as a starting point as documented in macb.h for oversized (big) frames, which is the configuration applied in case jumbo frames capability is not configured; ref. macb_main.c. Signed-off-by: Pieter Van Trappen Link: https://patch.msgid.link/20240812090657.583821-1-vtpieter@gmail.com Signed-off-by: Jakub Kicinski --- diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c index 97b4cc5feb95b..127bb32080340 100644 --- a/drivers/net/ethernet/cadence/macb_main.c +++ b/drivers/net/ethernet/cadence/macb_main.c @@ -5119,12 +5119,12 @@ static int macb_probe(struct platform_device *pdev) goto err_out_free_netdev; } - /* MTU range: 68 - 1500 or 10240 */ + /* MTU range: 68 - 1518 or 10240 */ dev->min_mtu = GEM_MTU_MIN_SIZE; if ((bp->caps & MACB_CAPS_JUMBO) && bp->jumbo_max_len) dev->max_mtu = bp->jumbo_max_len - ETH_HLEN - ETH_FCS_LEN; else - dev->max_mtu = ETH_DATA_LEN; + dev->max_mtu = 1536 - ETH_HLEN - ETH_FCS_LEN; if (bp->caps & MACB_CAPS_BD_RD_PREFETCH) { val = GEM_BFEXT(RXBD_RDBUFF, gem_readl(bp, DCFG10));