This is a note to let you know that I've just added the patch titled
net/mlx4_en: Disable RFS when running in SRIOV mode
to the 3.8-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-mlx4_en-disable-rfs-when-running-in-sriov-mode.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a229e488ac3f904d06c20d8d3f47831db3c7a15a Mon Sep 17 00:00:00 2001
From: Amir Vadai <amirv@xxxxxxxxxxxx>
Date: Thu, 7 Mar 2013 03:46:57 +0000
Subject: net/mlx4_en: Disable RFS when running in SRIOV mode
From: Amir Vadai <amirv@xxxxxxxxxxxx>
commit a229e488ac3f904d06c20d8d3f47831db3c7a15a upstream.
Commit 37706996 "mlx4_en: fix allocation of CPU affinity reverse-map" fixed
a bug when mlx4_dev->caps.comp_pool is larger from the device rx rings, but
introduced a regression.
When the mlx4_core is activating its "legacy mode" (e.g when running in SRIOV
mode) w.r.t to EQs/IRQs usage, comp_pool becomes zero and we're crashing on
divide by zero alloc_cpu_rmap.
Fix that by enabling RFS only when running in non-legacy mode.
Reported-by: Yan Burman <yanb@xxxxxxxxxxxx>
Cc: Kleber Sacilotto de Souza <klebers@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Amir Vadai <amirv@xxxxxxxxxxxx>
Signed-off-by: Or Gerlitz <ogerlitz@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
--- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
@@ -1434,9 +1434,11 @@ int mlx4_en_alloc_resources(struct mlx4_
}
#ifdef CONFIG_RFS_ACCEL
- priv->dev->rx_cpu_rmap = alloc_irq_cpu_rmap(priv->mdev->dev->caps.comp_pool);
- if (!priv->dev->rx_cpu_rmap)
- goto err;
+ if (priv->mdev->dev->caps.comp_pool) {
+ priv->dev->rx_cpu_rmap = alloc_irq_cpu_rmap(priv->mdev->dev->caps.comp_pool);
+ if (!priv->dev->rx_cpu_rmap)
+ goto err;
+ }
#endif
return 0;
Patches currently in stable-queue which might be from amirv@xxxxxxxxxxxx are
queue-3.8/net-mlx4_en-disable-rfs-when-running-in-sriov-mode.patch
queue-3.8/net-mlx4_en-initialize-rfs-filters-lock-and-list-in-init_netdev.patch
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