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net/mlx5e: Avoid accessing NULL pointer at ndo_select_queue 

To avoid multiply/division operations on the data path,
we hold a {channel, tc}==>txq mapping table.
We held this mapping table inside the channel object that is
being destroyed upon some configuration operations (e.g MTU change).
So in case ndo_select_queue occurs during such a configuration operation,
it may access a NULL channel pointer, resulting in kernel panic.
To fix this issue we moved the {channel, tc}==>txq mapping table
outside the channel object so that it will be available also
during such configuration operations.

Signed-off-by: Rana Shahout <ranas@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rana Shahout 2015-08-23 16:12:14 +03:00 committed by David S. Miller
parent 94c10f0ea3
commit 5283af899a
3 changed files with 6 additions and 6 deletions
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2
drivers/net/ethernet/mellanox/mlx5/core/en.h
View File

@ -405,7 +405,6 @@ struct mlx5e_channel {
__be32 mkey_be;
u8 num_tc;
unsigned long flags;
int tc_to_txq_map[MLX5E_MAX_NUM_TC];
/* control */
struct mlx5e_priv *priv;
@ -475,6 +474,7 @@ struct mlx5e_priv {
/* priv data path fields - start */
int default_vlan_prio;
struct mlx5e_sq **txq_to_sq_map;
int channeltc_to_txq_map[MLX5E_MAX_NUM_CHANNELS][MLX5E_MAX_NUM_TC];
/* priv data path fields - end */
unsigned long state;

8
drivers/net/ethernet/mellanox/mlx5/core/en_main.c
View File

@ -949,13 +949,13 @@ static void mlx5e_close_sqs(struct mlx5e_channel *c)
mlx5e_close_sq(&c->sq[tc]);
}
static void mlx5e_build_tc_to_txq_map(struct mlx5e_channel *c,
int num_channels)
static void mlx5e_build_channeltc_to_txq_map(struct mlx5e_priv *priv, int ix)
{
int i;
for (i = 0; i < MLX5E_MAX_NUM_TC; i++)
c->tc_to_txq_map[i] = c->ix + i * num_channels;
priv->channeltc_to_txq_map[ix][i] =
ix + i * priv->params.num_channels;
}
static int mlx5e_open_channel(struct mlx5e_priv *priv, int ix,
@ -979,7 +979,7 @@ static int mlx5e_open_channel(struct mlx5e_priv *priv, int ix,
c->mkey_be = cpu_to_be32(priv->mr.key);
c->num_tc = priv->params.num_tc;
mlx5e_build_tc_to_txq_map(c, priv->params.num_channels);
mlx5e_build_channeltc_to_txq_map(priv, ix);
netif_napi_add(netdev, &c->napi, mlx5e_napi_poll, 64);

2
drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
View File

@ -106,7 +106,7 @@ u16 mlx5e_select_queue(struct net_device *dev, struct sk_buff *skb,
priv->default_vlan_prio;
int tc = netdev_get_prio_tc_map(dev, up);
return priv->channel[channel_ix]->tc_to_txq_map[tc];
return priv->channeltc_to_txq_map[channel_ix][tc];
}
static inline u16 mlx5e_get_inline_hdr_size(struct mlx5e_sq *sq,