linux-kernel - RE: [PATCH net-next v2 2/2] net: ethtool: Add support for writing firmware blocks using EPL payload

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Message-ID:
 <DM6PR12MB4516B5AC9AF9F83B389573D4D8652@DM6PR12MB4516.namprd12.prod.outlook.com>
Date: Fri, 13 Sep 2024 07:29:32 +0000
From: Danielle Ratson <danieller@...dia.com>
To: Andrew Lunn <andrew@...n.ch>
CC: Simon Horman <horms@...nel.org>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "davem@...emloft.net" <davem@...emloft.net>,
	"edumazet@...gle.com" <edumazet@...gle.com>, "kuba@...nel.org"
	<kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>,
	"yuehaibing@...wei.com" <yuehaibing@...wei.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Petr Machata
	<petrm@...dia.com>
Subject: RE: [PATCH net-next v2 2/2] net: ethtool: Add support for writing
 firmware blocks using EPL payload

> From: Andrew Lunn <andrew@...n.ch>
> Sent: Wednesday, 11 September 2024 20:38
> To: Danielle Ratson <danieller@...dia.com>
> Cc: Simon Horman <horms@...nel.org>; netdev@...r.kernel.org;
> davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org;
> pabeni@...hat.com; yuehaibing@...wei.com; linux-kernel@...r.kernel.org;
> Petr Machata <petrm@...dia.com>
> Subject: Re: [PATCH net-next v2 2/2] net: ethtool: Add support for writing
> firmware blocks using EPL payload
> 
> > Hi Andrew,
> >
> > In both cases we transfer the same size of data, which corresponds to the
> size of the firmware image, to the module.
> > Moreover, in both cases the same size of data is passing on the wire, which
> depends on the wire obligations.
> >
> > But, instead of running #n "0103h: Write FW Block LPL" commands (see
> section 9.7.4 in CMIS 5.2) with up to 128 bytes, we are running #n/16
> "0104h: Write FW Block EPL" commands (see section 9.7.5 in CMIS 5.2) with
> up to 2048 bytes.
> > That means that instead of processing #n commands and sending back to
> the core the status for each one, we do it for only #n/16.
> 
> O.K, thanks.
> 
> > The standard does not say anything about the I2C layer, but the
> > speedup doesn’t lie in that.
> 
> What does your hardware do? Can it do 2048 byte I2C bus transfers? Or is it
> getting chopped up into smaller chunks?

No, it can not transfer 2048 bytes in one chunks, it is getting chopped in the driver.

Thanks,
Danielle

> 
> Thanks
> 	Andrew