netdev - Re: [net] i40e/i40evf: Update DESC_NEEDED value to reflect larger value

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Message-Id: <20180129.142228.1419627183293212271.davem@davemloft.net>
Date:   Mon, 29 Jan 2018 14:22:28 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     jeffrey.t.kirsher@...el.com
Cc:     alexander.h.duyck@...el.com, netdev@...r.kernel.org,
        nhorman@...hat.com, sassmann@...hat.com, jogreene@...hat.com
Subject: Re: [net] i40e/i40evf: Update DESC_NEEDED value to reflect larger
 value

From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Date: Fri, 26 Jan 2018 08:54:45 -0800

> From: Alexander Duyck <alexander.h.duyck@...el.com>
> 
> When compared to ixgbe and other previous Intel drivers the i40e and i40evf
> drivers actually reserve 2 additional descriptors in maybe_stop_tx for
> cache line alignment. We need to update DESC_NEEDED to reflect this as
> otherwise we are more likely to return TX_BUSY which will cause issues with
> things like xmit_more.
> 
> Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
> Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>

Applied, thanks.