linux-kernel - Re: [PATCH net-next 0/4] net/mlx5: Memory optimizations

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Message-ID: <879d6d7c-f789-69bc-9f2d-bf77d558586a@nvidia.com>
Date:   Wed, 1 Dec 2021 10:22:17 +0200
From:   Shay Drory <shayd@...dia.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     "David S . Miller" <davem@...emloft.net>, <jiri@...dia.com>,
        <saeedm@...dia.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 0/4] net/mlx5: Memory optimizations

On 11/30/2021 21:39, Jakub Kicinski wrote:
> On Tue, 30 Nov 2021 17:07:02 +0200 Shay Drory wrote:
>>   - Patch-1 Provides I/O EQ size resource which enables to save
>>     up to 128KB.
>>   - Patch-2 Provides event EQ size resource which enables to save up to
>>     512KB.
> Why is something allocated in host memory a device resource? 🤔

EQ resides in the host memory. It is RO for host driver, RW by device.
When interrupt is generated EQ entry is placed by device and read by driver.
It indicates about what event occurred such as CQE, async and more.

> Did you analyze if others may need this?

So far no feedback by other vendors.
The resources are implemented in generic way, if other vendors would
like to implement them.