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mlx4: xdp_prog becomes inactive after ethtool '-L' or '-G' 

After calling mlx4_en_try_alloc_resources (e.g. by changing the
number of rx-queues with ethtool -L), the existing xdp_prog becomes
inactive.

The bug is that the xdp_prog ptr has not been carried over from
the old rx-queues to the new rx-queues

Fixes: 47a38e1550 ("net/mlx4_en: add support for fast rx drop bpf program")
Cc: Brenden Blanco <bblanco@plumgrid.com>
Cc: Saeed Mahameed <saeedm@mellanox.com>
Cc: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Martin KaFai Lau 2017-01-31 22:35:33 -08:00 committed by David S. Miller
parent f32b20e89e
commit 770f82253d
3 changed files with 27 additions and 7 deletions
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4
drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
View File

@ -1099,7 +1099,7 @@ static int mlx4_en_set_ringparam(struct net_device *dev,
memcpy(&new_prof, priv->prof, sizeof(struct mlx4_en_port_profile));
new_prof.tx_ring_size = tx_size;
new_prof.rx_ring_size = rx_size;
err = mlx4_en_try_alloc_resources(priv, tmp, &new_prof);
err = mlx4_en_try_alloc_resources(priv, tmp, &new_prof, true);
if (err)
goto out;
@ -1774,7 +1774,7 @@ static int mlx4_en_set_channels(struct net_device *dev,
new_prof.tx_ring_num[TX_XDP] = xdp_count;
new_prof.rx_ring_num = channel->rx_count;
err = mlx4_en_try_alloc_resources(priv, tmp, &new_prof);
err = mlx4_en_try_alloc_resources(priv, tmp, &new_prof, true);
if (err)
goto out;

27
drivers/net/ethernet/mellanox/mlx4/en_netdev.c
View File

@ -2186,9 +2186,11 @@ static void mlx4_en_update_priv(struct mlx4_en_priv *dst,
int mlx4_en_try_alloc_resources(struct mlx4_en_priv *priv,
struct mlx4_en_priv *tmp,
struct mlx4_en_port_profile *prof)
struct mlx4_en_port_profile *prof,
bool carry_xdp_prog)
{
int t;
struct bpf_prog *xdp_prog;
int i, t;
mlx4_en_copy_priv(tmp, priv, prof);
@ -2202,6 +2204,23 @@ int mlx4_en_try_alloc_resources(struct mlx4_en_priv *priv,
}
return -ENOMEM;
}
/* All rx_rings has the same xdp_prog. Pick the first one. */
xdp_prog = rcu_dereference_protected(
priv->rx_ring[0]->xdp_prog,
lockdep_is_held(&priv->mdev->state_lock));
if (xdp_prog && carry_xdp_prog) {
xdp_prog = bpf_prog_add(xdp_prog, tmp->rx_ring_num);
if (IS_ERR(xdp_prog)) {
mlx4_en_free_resources(tmp);
return PTR_ERR(xdp_prog);
}
for (i = 0; i < tmp->rx_ring_num; i++)
rcu_assign_pointer(tmp->rx_ring[i]->xdp_prog,
xdp_prog);
}
return 0;
}
@ -2751,7 +2770,7 @@ static int mlx4_xdp_set(struct net_device *dev, struct bpf_prog *prog)
en_warn(priv, "Reducing the number of TX rings, to not exceed the max total rings number.\n");
}
err = mlx4_en_try_alloc_resources(priv, tmp, &new_prof);
err = mlx4_en_try_alloc_resources(priv, tmp, &new_prof, false);
if (err) {
if (prog)
bpf_prog_sub(prog, priv->rx_ring_num - 1);
@ -3495,7 +3514,7 @@ int mlx4_en_reset_config(struct net_device *dev,
memcpy(&new_prof, priv->prof, sizeof(struct mlx4_en_port_profile));
memcpy(&new_prof.hwtstamp_config, &ts_config, sizeof(ts_config));
err = mlx4_en_try_alloc_resources(priv, tmp, &new_prof);
err = mlx4_en_try_alloc_resources(priv, tmp, &new_prof, true);
if (err)
goto out;

3
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
View File

@ -679,7 +679,8 @@ void mlx4_en_set_stats_bitmap(struct mlx4_dev *dev,
int mlx4_en_try_alloc_resources(struct mlx4_en_priv *priv,
struct mlx4_en_priv *tmp,
struct mlx4_en_port_profile *prof);
struct mlx4_en_port_profile *prof,
bool carry_xdp_prog);
void mlx4_en_safe_replace_resources(struct mlx4_en_priv *priv,
struct mlx4_en_priv *tmp);