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Date: Wed, 8 Mar 2023 12:33:04 +0200
From: Tariq Toukan <ttoukan.linux@...il.com>
To: Lorenzo Bianconi <lorenzo@...nel.org>, netdev@...r.kernel.org
Cc: bpf@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
kuba@...nel.org, pabeni@...hat.com, ast@...nel.org,
daniel@...earbox.net, hawk@...nel.org, john.fastabend@...il.com,
saeedm@...dia.com, leon@...nel.org, shayagr@...zon.com,
akiyano@...zon.com, darinzon@...zon.com, sgoutham@...vell.com,
lorenzo.bianconi@...hat.com, toke@...hat.com, teknoraver@...a.com
Subject: Re: [PATCH net-next 7/8] net/mlx5e: take into account device
reconfiguration for xdp_features flag
On 07/03/2023 16:54, Lorenzo Bianconi wrote:
> Take into account LRO and GRO configuration setting device xdp_features
> flag. Moreover consider channel rq_wq_type enabling rx scatter-gatter
> support in xdp_features flag.
>
> Fixes: 66c0e13ad236 ("drivers: net: turn on XDP features")
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> ---
> drivers/net/ethernet/mellanox/mlx5/core/en.h | 1 +
> .../ethernet/mellanox/mlx5/core/en_ethtool.c | 10 ++++-
> .../net/ethernet/mellanox/mlx5/core/en_main.c | 45 ++++++++++++++++---
> .../net/ethernet/mellanox/mlx5/core/en_rep.c | 3 ++
> 4 files changed, 51 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
> index 88460b7796e5..4276c6eb6820 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
> @@ -1243,6 +1243,7 @@ void mlx5e_build_nic_params(struct mlx5e_priv *priv, struct mlx5e_xsk *xsk, u16
> void mlx5e_rx_dim_work(struct work_struct *work);
> void mlx5e_tx_dim_work(struct work_struct *work);
>
> +void mlx5e_set_xdp_feature(struct net_device *netdev);
> netdev_features_t mlx5e_features_check(struct sk_buff *skb,
> struct net_device *netdev,
> netdev_features_t features);
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
> index 7708acc9b2ab..79fd21ecb9cb 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
> @@ -1985,6 +1985,7 @@ static int set_pflag_rx_striding_rq(struct net_device *netdev, bool enable)
> struct mlx5e_priv *priv = netdev_priv(netdev);
> struct mlx5_core_dev *mdev = priv->mdev;
> struct mlx5e_params new_params;
> + int err;
>
> if (enable) {
> /* Checking the regular RQ here; mlx5e_validate_xsk_param called
> @@ -2005,7 +2006,14 @@ static int set_pflag_rx_striding_rq(struct net_device *netdev, bool enable)
> MLX5E_SET_PFLAG(&new_params, MLX5E_PFLAG_RX_STRIDING_RQ, enable);
> mlx5e_set_rq_type(mdev, &new_params);
>
> - return mlx5e_safe_switch_params(priv, &new_params, NULL, NULL, true);
> + err = mlx5e_safe_switch_params(priv, &new_params, NULL, NULL, true);
> + if (err)
> + return err;
> +
> + /* update XDP supported features */
> + mlx5e_set_xdp_feature(netdev);
> +
> + return 0;
> }
>
> static int set_pflag_rx_no_csum_complete(struct net_device *netdev, bool enable)
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> index 76a9c5194a70..1b68dd2be2c5 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> @@ -4004,6 +4004,30 @@ static int mlx5e_handle_feature(struct net_device *netdev,
> return 0;
> }
>
> +void mlx5e_set_xdp_feature(struct net_device *netdev)
> +{
> + struct mlx5e_priv *priv = netdev_priv(netdev);
> + bool ndo_xmit = test_bit(MLX5E_STATE_XDP_ACTIVE, &priv->state);
Our driver doesn't require loading a dummy XDP program to have the
redirect-in ability. It's always there.
I actually have a bug fix under internal review with Saeed that
addresses this.
In addition, it cleans up the NETDEV_XDP_ACT_NDO_XMIT_SG as we do not
support it yet. I have a series that's adding support and will submit it
soon.
Any reason you're submitting these fixes to net-next rather than net?
Maybe it'd be better if we integrate the patches, here's my fix (still
under review...):
Author: Tariq Toukan <tariqt@...dia.com>
Date: Thu Feb 23 08:58:04 2023 +0200
net/mlx5e: Fix exposed xdp_features
Always declare NETDEV_XDP_ACT_NDO_XMIT as the ndo_xdp_xmit callback
is always functional per our design, and does not require loading
a dummy xdp program.
Although non-linear XDP buffer is supported for XDP_TX flow, do not
declare NETDEV_XDP_ACT_NDO_XMIT_SG as it is yet supported for
redirected-in frames.
Fixes: 66c0e13ad236 ("drivers: net: turn on XDP features")
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 53feb0529943..9a5d3ce1fbcd 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -4741,13 +4741,6 @@ static int mlx5e_xdp_set(struct net_device
*netdev, struct bpf_prog *prog)
if (old_prog)
bpf_prog_put(old_prog);
- if (reset) {
- if (prog)
- xdp_features_set_redirect_target(netdev, true);
- else
- xdp_features_clear_redirect_target(netdev);
- }
-
if (!test_bit(MLX5E_STATE_OPENED, &priv->state) || reset)
goto unlock;
@@ -5144,6 +5137,7 @@ static void mlx5e_build_nic_netdev(struct
net_device *netdev)
netdev->features |= NETIF_F_HW_VLAN_STAG_FILTER;
netdev->xdp_features = NETDEV_XDP_ACT_BASIC |
NETDEV_XDP_ACT_REDIRECT |
+ NETDEV_XDP_ACT_NDO_XMIT |
NETDEV_XDP_ACT_XSK_ZEROCOPY |
NETDEV_XDP_ACT_RX_SG;
> + struct mlx5e_params *params = &priv->channels.params;
> + xdp_features_t val;
> +
> + if (params->packet_merge.type != MLX5E_PACKET_MERGE_NONE) {
> + xdp_clear_features_flag(netdev);
> + return;
> + }
> +
> + val = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |
> + NETDEV_XDP_ACT_XSK_ZEROCOPY;
> + if (ndo_xmit)
> + val |= NETDEV_XDP_ACT_NDO_XMIT;
> + if (params->rq_wq_type == MLX5_WQ_TYPE_CYCLIC) {
> + val |= NETDEV_XDP_ACT_RX_SG;
> + if (ndo_xmit)
> + val |= NETDEV_XDP_ACT_NDO_XMIT_SG;
This NETDEV_XDP_ACT_NDO_XMIT_SG capability is not related to the RQ
type. It's still not supported at this point.
BTW, I have a series completing all the missing capabilities (multibuf
on Striding + multibuf redirect-in), should be submitted in this kernel.
> + }
> + xdp_set_features_flag(netdev, val);
> +}
> +
> int mlx5e_set_features(struct net_device *netdev, netdev_features_t features)
> {
> netdev_features_t oper_features = features;
> @@ -4030,6 +4054,9 @@ int mlx5e_set_features(struct net_device *netdev, netdev_features_t features)
> return -EINVAL;
> }
>
> + /* update XDP supported features */
> + mlx5e_set_xdp_feature(netdev);
> +
> return 0;
> }
>
> @@ -4762,10 +4789,14 @@ static int mlx5e_xdp_set(struct net_device *netdev, struct bpf_prog *prog)
> bpf_prog_put(old_prog);
>
> if (reset) {
> - if (prog)
> - xdp_features_set_redirect_target(netdev, true);
> - else
> + if (prog) {
> + bool xmit_sg;
> +
> + xmit_sg = new_params.rq_wq_type == MLX5_WQ_TYPE_CYCLIC;
Same, not related. Still not supported at this point.
> + xdp_features_set_redirect_target(netdev, xmit_sg);
> + } else {
> xdp_features_clear_redirect_target(netdev);
> + }
> }
>
> if (!test_bit(MLX5E_STATE_OPENED, &priv->state) || reset)
> @@ -5163,13 +5194,10 @@ static void mlx5e_build_nic_netdev(struct net_device *netdev)
> netdev->features |= NETIF_F_HIGHDMA;
> netdev->features |= NETIF_F_HW_VLAN_STAG_FILTER;
>
> - netdev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |
> - NETDEV_XDP_ACT_XSK_ZEROCOPY |
> - NETDEV_XDP_ACT_RX_SG;
> -
> netdev->priv_flags |= IFF_UNICAST_FLT;
>
> netif_set_tso_max_size(netdev, GSO_MAX_SIZE);
> + mlx5e_set_xdp_feature(netdev);
> mlx5e_set_netdev_dev_addr(netdev);
> mlx5e_macsec_build_netdev(priv);
> mlx5e_ipsec_build_netdev(priv);
> @@ -5241,6 +5269,9 @@ static int mlx5e_nic_init(struct mlx5_core_dev *mdev,
> mlx5_core_err(mdev, "TLS initialization failed, %d\n", err);
>
> mlx5e_health_create_reporters(priv);
> + /* update XDP supported features */
> + mlx5e_set_xdp_feature(netdev);
> +
> return 0;
> }
>
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
> index 9b9203443085..43fd12fb87b8 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
> @@ -747,6 +747,9 @@ static void mlx5e_build_rep_params(struct net_device *netdev)
> /* RQ */
> mlx5e_build_rq_params(mdev, params);
>
> + /* update XDP supported features */
> + mlx5e_set_xdp_feature(netdev);
> +
> /* CQ moderation params */
> params->rx_dim_enabled = MLX5_CAP_GEN(mdev, cq_moderation);
> mlx5e_set_rx_cq_mode_params(params, cq_period_mode);
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