netdev - Re: MSI-X vector count on 82754L

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Message-ID: <CACqU3MUfQn_r2oJ+ptuzYhkkUoucfL_NTMnHoCa0+TouP0s0kA@mail.gmail.com>
Date:	Mon, 19 Sep 2011 01:34:27 -0400
From:	Arnaud Lacombe <lacombar@...il.com>
To:	Bruce Allan <bruce.w.allan@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:	netdev@...r.kernel.org, Jack Vogel <jack.vogel@...el.com>
Subject: Re: MSI-X vector count on 82754L

[fixing address of the netdev@ list, sorry - A.]

On Mon, Sep 19, 2011 at 1:31 AM, Arnaud Lacombe <lacombar@...il.com> wrote:
> Hi folks,
>
> In:
>
> commit 4662e82b2cb41c60826e50474dd86dd5c6372b0c
> Author: Bruce Allan <bruce.w.allan@...el.com>
> Date:   Tue Aug 26 18:37:06 2008 -0700
>
>    e1000e: add support for new 82574L part
>
>    This new part has the same feature set as previous parts with the addition
>    of MSI-X support.
>
>    Signed-off-by: Bruce Allan <bruce.w.allan@...el.com>
>    Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
>    Signed-off-by: Jeff Garzik <jgarzik@...hat.com>
>
> MSI-X support was added to the e1000e driver, later on slightly reworked by:
>
> commit 8e86acd7d5968e08b3e1604e685a8c45f6fd7f40
> Author: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> Date:   Mon Aug 2 14:27:23 2010 +0000
>
>    e1000e: Fix irq_synchronize in MSI-X case
>
>    Based on original patch/work from Jean Delvare <jdelvare@...e.de>
>    Synchronize all IRQs when in MSI-X IRQ mode.
>
>    Jean's original patch hard coded the sync with the 3 possible vectors,
>    this patch incorporates more flexibility for the future and aligns
>    with how igb stores the number of vectors into the adapter structure.
>
>    CC: Jean Delvare <jdelvare@...e.de>
>    Cc: Jesse Brandeburg <jesse.brandeburg@...el.com>
>    Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
>    Tested-by: Jeff Pieper <jeffrey.e.pieper@...el.com>
>    Acked-by: Bruce Allan <bruce.w.allan@...el.com>
>    Signed-off-by: David S. Miller <davem@...emloft.net>
>
> [It is unclear to what "Jean" does this commit log refers to, as the
> support MSI-X was added Bruce, anyway...]
>
> Why only 3 vectors are used when both the product brief and the
> datasheet advertise up to 5 MSI-X vector usable by the chip ? That is
> 2*RX + 2*TX.
>
> Thanks in advance,
>  - Arnaud
>
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