linux-kernel - [PATCH iwl-next v2 3/9] igc: Optimize the TX packet buffer utilization

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Message-Id: <20250205100524.1138523-4-faizal.abdul.rahim@linux.intel.com>
Date: Wed,  5 Feb 2025 05:05:18 -0500
From: Faizal Rahim <faizal.abdul.rahim@...ux.intel.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>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Simon Horman <horms@...nel.org>,
	Russell King <linux@...linux.org.uk>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Russell King <rmk+kernel@...linux.org.uk>,
	Furong Xu <0x1207@...il.com>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Serge Semin <fancer.lancer@...il.com>,
	Xiaolei Wang <xiaolei.wang@...driver.com>,
	Suraj Jaiswal <quic_jsuraj@...cinc.com>,
	Kory Maincent <kory.maincent@...tlin.com>,
	Petr Tesarik <petr@...arici.cz>,
	Faizal Rahim <faizal.abdul.rahim@...ux.intel.com>,
	Choong Yong Liang <yong.liang.choong@...ux.intel.com>,
	Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
	Vinicius Costa Gomes <vinicius.gomes@...el.com>,
	intel-wired-lan@...ts.osuosl.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org,
	bpf@...r.kernel.org
Subject: [PATCH iwl-next v2 3/9] igc: Optimize the TX packet buffer utilization

Packet buffers (RX + TX) total 64KB. Neither RX or TX buffers can be
larger than 34KB. So divide the buffer equally, 32KB for each.

Co-developed-by: Vinicius Costa Gomes <vinicius.gomes@...el.com>
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@...el.com>
Signed-off-by: Faizal Rahim <faizal.abdul.rahim@...ux.intel.com>
---
 drivers/net/ethernet/intel/igc/igc_defines.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/igc/igc_defines.h b/drivers/net/ethernet/intel/igc/igc_defines.h
index 8e449904aa7d..516ef70c98e9 100644
--- a/drivers/net/ethernet/intel/igc/igc_defines.h
+++ b/drivers/net/ethernet/intel/igc/igc_defines.h
@@ -400,7 +400,8 @@
 #define I225_TXPBSIZE_DEFAULT	0x04000014 /* TXPBSIZE default */
 #define IGC_RXPBS_CFG_TS_EN	0x80000000 /* Timestamp in Rx buffer */
 
-#define IGC_TXPBSIZE_TSN	0x04145145 /* 5k bytes buffer for each queue */
+ /* 7KB bytes buffer for each tx queue (total 4 queues) + 4KB for BMC*/
+#define IGC_TXPBSIZE_TSN	0x041c71c7
 
 #define IGC_DTXMXPKTSZ_TSN	0x19 /* 1600 bytes of max TX DMA packet size */
 #define IGC_DTXMXPKTSZ_DEFAULT	0x98 /* 9728-byte Jumbo frames */
-- 
2.34.1