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Message-ID: <1485589251-3896393-1-git-send-email-kafai@fb.com>
Date: Fri, 27 Jan 2017 23:40:51 -0800
From: Martin KaFai Lau <kafai@...com>
To: <netdev@...r.kernel.org>
CC: Brenden Blanco <bblanco@...mgrid.com>,
Saeed Mahameed <saeedm@...lanox.com>,
Tariq Toukan <tariqt@...lanox.com>,
Kernel Team <kernel-team@...com>
Subject: [PATCH net] mlx4: xdp_prog becomes inactive after ethtool '-L' or '-G'
If the rx-queues ever get re-initialized (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: 47a38e155037 ("net/mlx4_en: add support for fast rx drop bpf program")
Signed-off-by: Martin KaFai Lau <kafai@...com>
---
drivers/net/ethernet/mellanox/mlx4/en_ethtool.c | 4 +-
drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 52 ++++++++++++++++++++-----
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 3 +-
3 files changed, 47 insertions(+), 12 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
index d5a9372ed84d..9aa422691954 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
@@ -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;
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
index 761f8b12399c..f4179086b3c6 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
@@ -2184,23 +2184,57 @@ 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 = NULL;
+ int err;
+ int i;
mlx4_en_copy_priv(tmp, priv, prof);
+ if (carry_xdp_prog) {
+ /* 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) {
+ xdp_prog = bpf_prog_add(xdp_prog, tmp->rx_ring_num);
+ if (IS_ERR(xdp_prog)) {
+ err = PTR_ERR(xdp_prog);
+ xdp_prog = NULL;
+ goto err_free;
+ }
+ }
+ }
+
if (mlx4_en_alloc_resources(tmp)) {
en_warn(priv,
"%s: Resource allocation failed, using previous configuration\n",
__func__);
- for (t = 0; t < MLX4_EN_NUM_TX_TYPES; t++) {
- kfree(tmp->tx_ring[t]);
- kfree(tmp->tx_cq[t]);
- }
- return -ENOMEM;
+ err = -ENOMEM;
+ goto err_free;
+ }
+
+ if (xdp_prog) {
+ for (i = 0; i < tmp->rx_ring_num; i++)
+ rcu_assign_pointer(tmp->rx_ring[i]->xdp_prog,
+ xdp_prog);
}
+
return 0;
+
+err_free:
+ if (xdp_prog)
+ bpf_prog_sub(xdp_prog, tmp->rx_ring_num);
+
+ for (i = 0; i < MLX4_EN_NUM_TX_TYPES; i++) {
+ kfree(tmp->tx_ring[i]);
+ kfree(tmp->tx_cq[i]);
+ }
+
+ return err;
}
void mlx4_en_safe_replace_resources(struct mlx4_en_priv *priv,
@@ -2755,7 +2789,7 @@ 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);
@@ -3499,7 +3533,7 @@ 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;
diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
index ba1c6cd0cc79..cec59bc264c9 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
+++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
@@ -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);
--
2.5.1
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