netdev - [PATCH net-next v2 14/18] net: macb: add no LSO capability (MACB_CAPS_NO

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250627-macb-v2-14-ff8207d0bb77@bootlin.com>
Date: Fri, 27 Jun 2025 11:09:00 +0200
From: Théo Lebrun <theo.lebrun@...tlin.com>
To: Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Nicolas Ferre <nicolas.ferre@...rochip.com>, 
 Claudiu Beznea <claudiu.beznea@...on.dev>, 
 Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Alexandre Ghiti <alex@...ti.fr>, Samuel Holland <samuel.holland@...ive.com>, 
 Richard Cochran <richardcochran@...il.com>, 
 Russell King <linux@...linux.org.uk>, 
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>, 
 Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>, 
 Gregory CLEMENT <gregory.clement@...tlin.com>, 
 Cyrille Pitchen <cyrille.pitchen@...el.com>, 
 Harini Katakam <harini.katakam@...inx.com>, 
 Rafal Ozieblo <rafalo@...ence.com>, 
 Haavard Skinnemoen <hskinnemoen@...el.com>, Jeff Garzik <jeff@...zik.org>
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org, 
 linux-mips@...r.kernel.org, Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 Tawfik Bayouk <tawfik.bayouk@...ileye.com>, 
 Théo Lebrun <theo.lebrun@...tlin.com>, 
 Andrew Lunn <andrew@...n.ch>
Subject: [PATCH net-next v2 14/18] net: macb: add no LSO capability
 (MACB_CAPS_NO_LSO)

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@...n.ch>
Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.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