linux-kernel - Re: [PATCHv2] rpmsg: compute number of buffers to allocate from vrings

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Date:	Thu, 13 Nov 2014 11:46:04 -0600
From:	Suman Anna <s-anna@...com>
To:	Ohad Ben-Cohen <ohad@...ery.com>
CC:	Rusty Russell <rusty@...tcorp.com.au>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	Dave Gerlach <d-gerlach@...com>
Subject: Re: [PATCHv2] rpmsg: compute number of buffers to allocate from vrings

Hi Ohad,

On 09/16/2014 01:33 PM, Suman Anna wrote:
> The buffers to be used for communication are allocated during the
> rpmsg virtio driver's probe, and the total number of buffers is
> currently hard-coded to 512. The vring configuration can vary from
> one platform to another or between different remote processors. The
> setup of the receive buffers will throw a WARN_ON if the associated
> vrings are configured with less than 256 buffers (in each direction).
> So, adjust this hard-coded value to rely on the number of buffers the
> virtqueue vring is setup with, but also limit to use 256 buffers at
> most in each direction to avoid wacky resource tables consuming up
> unreasonable memory.
> 
> NOTE: The number of buffers is already assumed to be symmetrical
> in each direction, and that logic is not unchanged.
> 
> Signed-off-by: Suman Anna <s-anna@...com>
> ---
> v2 changes:
> - add upper limit on buffers and update comments
> - revise patch description

Any comments on this one, if not can you pick this up for 3.19?

regards
Suman

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