netdev - Re: [PATCH net] net/mlx5e: Do not recycle pages from emergency reserve

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Message-Id: <20170120.124301.1228899617504374421.davem@davemloft.net>
Date:   Fri, 20 Jan 2017 12:43:01 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     netdev@...r.kernel.org, tariqt@...lanox.com, saeedm@...lanox.com
Subject: Re: [PATCH net] net/mlx5e: Do not recycle pages from emergency
 reserve

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 18 Jan 2017 23:03:08 -0800

> From: Eric Dumazet <edumazet@...gle.com>
> 
> A driver using dev_alloc_page() must not reuse a page allocated from
> emergency memory reserve.
> 
> Otherwise all packets using this page will be immediately dropped,
> unless for very specific sockets having SOCK_MEMALLOC bit set.
> 
> This issue might be hard to debug, because only a fraction of received
> packets would be dropped.
> 
> Fixes: 4415a0319f92 ("net/mlx5e: Implement RX mapped page cache for page recycle")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied and queued up for -stable, thanks.