[PATCH net-next v2 14/18] net: macb: add no LSO capability (MACB_CAPS_NO_LSO)
Théo Lebrun
theo.lebrun at bootlin.com
Fri Jun 27 02:09:00 PDT 2025
LSO is runtime-detected using the PBUF_LSO field inside register
designcfg_debug6/GEM_DCFG6. Allow disabling that feature if it is
broken by using struct macb_config->caps.
Reviewed-by: Andrew Lunn <andrew at lunn.ch>
Signed-off-by: Théo Lebrun <theo.lebrun at bootlin.com>
---
drivers/net/ethernet/cadence/macb.h | 1 +
drivers/net/ethernet/cadence/macb_main.c | 6 ++++--
2 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
index d42c81cf441ce435cad38e2dfd779b0e6a141bf3..e5de6549861965e2823044d81b6abc20d2b27ceb 100644
--- a/drivers/net/ethernet/cadence/macb.h
+++ b/drivers/net/ethernet/cadence/macb.h
@@ -736,6 +736,7 @@
#define MACB_CAPS_NEED_TSUCLK BIT(10)
#define MACB_CAPS_QUEUE_DISABLE BIT(11)
#define MACB_CAPS_RSC_CAPABLE BIT(12)
+#define MACB_CAPS_NO_LSO BIT(13)
#define MACB_CAPS_PCS BIT(24)
#define MACB_CAPS_HIGH_SPEED BIT(25)
#define MACB_CAPS_CLK_HW_CHG BIT(26)
diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 34223dad2d01ae4bcefc0823c868a67f59435638..f9a3a5caebcafe3d9197a3bc7681b64734d7ac93 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -4346,8 +4346,10 @@ 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 */
--
2.50.0
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