netdev - Re: [PATCH net 2/2] ethtool: cmis: use u16 for calculated read_write_len

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Message-ID: <20250403090406.GB214849@horms.kernel.org>
Date: Thu, 3 Apr 2025 10:04:06 +0100
From: Simon Horman <horms@...nel.org>
To: Michael Chan <michael.chan@...adcom.com>
Cc: davem@...emloft.net, netdev@...r.kernel.org, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, andrew@...n.ch,
	danieller@...dia.com, damodharam.ammepalli@...adcom.com,
	andrew.gospodarek@...adcom.com
Subject: Re: [PATCH net 2/2] ethtool: cmis: use u16 for calculated
 read_write_len_ext

On Wed, Apr 02, 2025 at 11:31:23AM -0700, Michael Chan wrote:
> From: Damodharam Ammepalli <damodharam.ammepalli@...adcom.com>
> 
> For EPL (Extended Payload), the maximum calculated size returned by
> ethtool_cmis_get_max_epl_size() is 2048, so the read_write_len_ext
> field in struct ethtool_cmis_cdb_cmd_args needs to be changed to u16
> to hold the value.
> 
> To avoid confusion with other u8 read_write_len_ext fields defined
> by the CMIS spec, change the field name to calc_read_write_len_ext.
> 
> Without this change, module flashing can fail:
> 
> Transceiver module firmware flashing started for device enp177s0np0
> Transceiver module firmware flashing in progress for device enp177s0np0
> Progress: 0%
> Transceiver module firmware flashing encountered an error for device enp177s0np0
> Status message: Write FW block EPL command failed, LPL length is longer
> 	than CDB read write length extension allows.
> 
> Fixes: a39c84d79625 ("ethtool: cmis_cdb: Add a layer for supporting CDB commands)

Hi Damodharam, all,

As per my comment on patch 1/2: I don't think there is any need to resend
for this, but I think there is a '"' missing towards the end of the Fixes
tag above. That is, I think it should look like this.

Fixes: a39c84d79625 ("ethtool: cmis_cdb: Add a layer for supporting CDB commands")

> Reviewed-by: Andy Gospodarek <andrew.gospodarek@...adcom.com>
> Signed-off-by: Damodharam Ammepalli <damodharam.ammepalli@...adcom.com>
> Signed-off-by: Michael Chan <michael.chan@...adcom.com>

Other than the nit above this looks good to me.

Reviewed-by: Simon Horman <horms@...nel.org>