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net: macb: increase max_mtu for oversized frames

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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 <pieter.van.trappen@cern.ch>
Link: https://patch.msgid.link/20240812090657.583821-1-vtpieter@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Pieter Van Trappen
2024-08-12 11:06:55 +02:00
committed by Jakub Kicinski
parent e7d731326e
commit 7cb4357964
1 changed files with 2 additions and 2 deletions
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drivers/net/ethernet/cadence/macb_main.c
+2 -2
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@@ -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));