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net: macb: add no LSO capability (MACB_CAPS_NO_LSO)

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LSO is runtime-detected using the PBUF_LSO field inside register DCFG6.
Allow disabling that feature if it is broken by using bp->caps coming
from match data.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
Link: https://patch.msgid.link/20251023-macb-eyeq5-v3-3-af509422c204@bootlin.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Théo Lebrun 2025-10-23 18:22:53 +02:00 committed by Paolo Abeni
parent ae7a9585ea
commit 7a3d209145
2 changed files with 6 additions and 2 deletions
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1
drivers/net/ethernet/cadence/macb.h
View File

@ -778,6 +778,7 @@
#define MACB_CAPS_DMA_64B BIT(21)
#define MACB_CAPS_DMA_PTP BIT(22)
#define MACB_CAPS_RSC BIT(23)
#define MACB_CAPS_NO_LSO BIT(24)
/* LSO settings */
#define MACB_LSO_UFO_ENABLE 0x01

7
drivers/net/ethernet/cadence/macb_main.c
View File

@ -4564,8 +4564,11 @@ static int macb_init(struct platform_device *pdev)
/* Set features */
dev->hw_features = NETIF_F_SG;
/* Check LSO capability */
if (GEM_BFEXT(PBUF_LSO, gem_readl(bp, DCFG6)))
/* Check LSO capability; runtime detection can be overridden by a cap
* flag if the hardware is known to be buggy
*/
if (!(bp->caps & MACB_CAPS_NO_LSO) &&
GEM_BFEXT(PBUF_LSO, gem_readl(bp, DCFG6)))
dev->hw_features |= MACB_NETIF_LSO;
/* Checksum offload is only available on gem with packet buffer */