This is a note to let you know that I've just added the patch titled
net/mlx5e: Do not recycle pages from emergency reserve
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-mlx5e-do-not-recycle-pages-from-emergency-reserve.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Wed Feb 1 08:50:24 CET 2017
From: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Wed, 18 Jan 2017 23:03:08 -0800
Subject: net/mlx5e: Do not recycle pages from emergency reserve
From: Eric Dumazet <edumazet@xxxxxxxxxx>
[ Upstream commit e048fc50d7bde23136e098e04a324d7e3404408d ]
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@xxxxxxxxxx>
Cc: Tariq Toukan <tariqt@xxxxxxxxxxxx>
Cc: Saeed Mahameed <saeedm@xxxxxxxxxxxx>
Acked-by: Saeed Mahameed <saeedm@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/mellanox/mlx5/core/en_rx.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -193,6 +193,9 @@ static inline bool mlx5e_rx_cache_put(st
return false;
}
+ if (unlikely(page_is_pfmemalloc(dma_info->page)))
+ return false;
+
cache->page_cache[cache->tail] = *dma_info;
cache->tail = tail_next;
return true;
Patches currently in stable-queue which might be from edumazet@xxxxxxxxxx are
queue-4.9/mlx4-do-not-call-napi_schedule-without-care.patch
queue-4.9/net-mlx5e-do-not-recycle-pages-from-emergency-reserve.patch
queue-4.9/net-fix-harmonize_features-vs-netif_f_highdma.patch
queue-4.9/tcp-fix-tcp_fastopen-unaligned-access-complaints-on-sparc.patch
queue-4.9/tcp-initialize-max-window-for-a-new-fastopen-socket.patch
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