linux-kernel - [PATCH iwl-net v1] igc: Use 5KB TX packet buffer per queue for TSN mode

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Message-ID: <20251202122351.11915-1-chwee.lin.choong@intel.com>
Date: Tue,  2 Dec 2025 20:23:51 +0800
From: Chwee-Lin Choong <chwee.lin.choong@...el.com>
To: Tony Nguyen <anthony.l.nguyen@...el.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	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>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Bouska@....codeaurora.org,
	Zdenek <zdenek.bouska@...mens.com>,
	Faizal Rahim <faizal.abdul.rahim@...ux.intel.com>
Subject: [PATCH iwl-net v1] igc: Use 5KB TX packet buffer per queue for TSN mode

Update IGC_TXPBSIZE_TSN to allocate 5KB per TX queue (TXQ0-TXQ3)
as recommended in I225/I226 SW User Manual Section 7.5.4 for TSN
operation.

Fixes: 0d58cdc902da ("igc: optimize TX packet buffer utilization for TSN mode")
Reported-by: Bouska, Zdenek <zdenek.bouska@...mens.com>
Closes: https://lore.kernel.org/netdev/AS1PR10MB5675DBFE7CE5F2A9336ABFA4EBEAA@AS1PR10MB5675.EURPRD10.PROD.OUTLOOK.COM/
Signed-off-by: Chwee-Lin Choong <chwee.lin.choong@...el.com>
---
 drivers/net/ethernet/intel/igc/igc_defines.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/igc/igc_defines.h b/drivers/net/ethernet/intel/igc/igc_defines.h
index 498ba1522ca4..9482ab11f050 100644
--- a/drivers/net/ethernet/intel/igc/igc_defines.h
+++ b/drivers/net/ethernet/intel/igc/igc_defines.h
@@ -443,9 +443,10 @@
 #define IGC_TXPBSIZE_DEFAULT ( \
 	IGC_TXPB0SIZE(20) | IGC_TXPB1SIZE(0) | IGC_TXPB2SIZE(0) | \
 	IGC_TXPB3SIZE(0) | IGC_OS2BMCPBSIZE(4))
+/* TSN value following I225/I226 SW User Manual Section 7.5.4 */
 #define IGC_TXPBSIZE_TSN ( \
-	IGC_TXPB0SIZE(7) | IGC_TXPB1SIZE(7) | IGC_TXPB2SIZE(7) | \
-	IGC_TXPB3SIZE(7) | IGC_OS2BMCPBSIZE(4))
+	IGC_TXPB0SIZE(5) | IGC_TXPB1SIZE(5) | IGC_TXPB2SIZE(5) | \
+	IGC_TXPB3SIZE(5) | IGC_OS2BMCPBSIZE(4))
 
 #define IGC_DTXMXPKTSZ_TSN	0x19 /* 1600 bytes of max TX DMA packet size */
 #define IGC_DTXMXPKTSZ_DEFAULT	0x98 /* 9728-byte Jumbo frames */
-- 
2.43.0