linux-kernel - Re: [PATCH iwl-next v8 05/11] igc: optimize the TX packet buffer utilization

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Message-ID: <20250305224642.7c6dz52mhj35f4f4@skbuf>
Date: Thu, 6 Mar 2025 00:46:42 +0200
From: Vladimir Oltean <vladimir.oltean@....com>
To: Faizal Rahim <faizal.abdul.rahim@...ux.intel.com>
Cc: 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>,
	Furong Xu <0x1207@...il.com>,
	Russell King <rmk+kernel@...linux.org.uk>,
	Serge Semin <fancer.lancer@...il.com>,
	Xiaolei Wang <xiaolei.wang@...driver.com>,
	Suraj Jaiswal <quic_jsuraj@...cinc.com>,
	Kory Maincent <kory.maincent@...tlin.com>,
	Gal Pressman <gal@...dia.com>,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	Choong Yong Liang <yong.liang.choong@...ux.intel.com>,
	Chwee-Lin Choong <chwee.lin.choong@...el.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: Re: [PATCH iwl-next v8 05/11] igc: optimize the TX packet buffer
 utilization

On Wed, Mar 05, 2025 at 08:00:20AM -0500, Faizal Rahim wrote:
> 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*/

Strange formatting here: space before "/*" but no space before "*/"?

> +#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
>