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Date: Tue, 13 Dec 2022 10:56:44 +0200
From: Tariq Toukan <ttoukan.linux@...il.com>
To: Stanislav Fomichev <sdf@...gle.com>, bpf@...r.kernel.org
Cc: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
martin.lau@...ux.dev, song@...nel.org, yhs@...com,
john.fastabend@...il.com, kpsingh@...nel.org, haoluo@...gle.com,
jolsa@...nel.org, Tariq Toukan <tariqt@...dia.com>,
David Ahern <dsahern@...il.com>,
Jakub Kicinski <kuba@...nel.org>,
Willem de Bruijn <willemb@...gle.com>,
Jesper Dangaard Brouer <brouer@...hat.com>,
Anatoly Burakov <anatoly.burakov@...el.com>,
Alexander Lobakin <alexandr.lobakin@...el.com>,
Magnus Karlsson <magnus.karlsson@...il.com>,
Maryam Tahhan <mtahhan@...hat.com>, xdp-hints@...-project.net,
netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next v4 11/15] net/mlx4_en: Support RX XDP metadata
On 12/13/2022 4:36 AM, Stanislav Fomichev wrote:
> RX timestamp and hash for now. Tested using the prog from the next
> patch.
>
> Also enabling xdp metadata support; don't see why it's disabled,
> there is enough headroom..
>
> Cc: Tariq Toukan <tariqt@...dia.com>
> Cc: John Fastabend <john.fastabend@...il.com>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Martin KaFai Lau <martin.lau@...ux.dev>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: Willem de Bruijn <willemb@...gle.com>
> Cc: Jesper Dangaard Brouer <brouer@...hat.com>
> Cc: Anatoly Burakov <anatoly.burakov@...el.com>
> Cc: Alexander Lobakin <alexandr.lobakin@...el.com>
> Cc: Magnus Karlsson <magnus.karlsson@...il.com>
> Cc: Maryam Tahhan <mtahhan@...hat.com>
> Cc: xdp-hints@...-project.net
> Cc: netdev@...r.kernel.org
> Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
> ---
> drivers/net/ethernet/mellanox/mlx4/en_clock.c | 13 +++++---
> .../net/ethernet/mellanox/mlx4/en_netdev.c | 6 ++++
> drivers/net/ethernet/mellanox/mlx4/en_rx.c | 33 ++++++++++++++++++-
> drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 5 +++
> 4 files changed, 52 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_clock.c b/drivers/net/ethernet/mellanox/mlx4/en_clock.c
> index 98b5ffb4d729..9e3b76182088 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_clock.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_clock.c
> @@ -58,9 +58,7 @@ u64 mlx4_en_get_cqe_ts(struct mlx4_cqe *cqe)
> return hi | lo;
> }
>
> -void mlx4_en_fill_hwtstamps(struct mlx4_en_dev *mdev,
> - struct skb_shared_hwtstamps *hwts,
> - u64 timestamp)
> +u64 mlx4_en_get_hwtstamp(struct mlx4_en_dev *mdev, u64 timestamp)
> {
> unsigned int seq;
> u64 nsec;
> @@ -70,8 +68,15 @@ void mlx4_en_fill_hwtstamps(struct mlx4_en_dev *mdev,
> nsec = timecounter_cyc2time(&mdev->clock, timestamp);
> } while (read_seqretry(&mdev->clock_lock, seq));
>
> + return ns_to_ktime(nsec);
> +}
> +
> +void mlx4_en_fill_hwtstamps(struct mlx4_en_dev *mdev,
> + struct skb_shared_hwtstamps *hwts,
> + u64 timestamp)
> +{
> memset(hwts, 0, sizeof(struct skb_shared_hwtstamps));
> - hwts->hwtstamp = ns_to_ktime(nsec);
> + hwts->hwtstamp = mlx4_en_get_hwtstamp(mdev, timestamp);
> }
>
> /**
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> index 8800d3f1f55c..af4c4858f397 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> @@ -2889,6 +2889,11 @@ static const struct net_device_ops mlx4_netdev_ops_master = {
> .ndo_bpf = mlx4_xdp,
> };
>
> +static const struct xdp_metadata_ops mlx4_xdp_metadata_ops = {
> + .xmo_rx_timestamp = mlx4_en_xdp_rx_timestamp,
> + .xmo_rx_hash = mlx4_en_xdp_rx_hash,
> +};
> +
> struct mlx4_en_bond {
> struct work_struct work;
> struct mlx4_en_priv *priv;
> @@ -3310,6 +3315,7 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
> dev->netdev_ops = &mlx4_netdev_ops_master;
> else
> dev->netdev_ops = &mlx4_netdev_ops;
> + dev->xdp_metadata_ops = &mlx4_xdp_metadata_ops;
> dev->watchdog_timeo = MLX4_EN_WATCHDOG_TIMEOUT;
> netif_set_real_num_tx_queues(dev, priv->tx_ring_num[TX]);
> netif_set_real_num_rx_queues(dev, priv->rx_ring_num);
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> index 014a80af2813..0869d4fff17b 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> @@ -663,8 +663,35 @@ static int check_csum(struct mlx4_cqe *cqe, struct sk_buff *skb, void *va,
>
> struct mlx4_en_xdp_buff {
> struct xdp_buff xdp;
> + struct mlx4_cqe *cqe;
> + struct mlx4_en_dev *mdev;
> + struct mlx4_en_rx_ring *ring;
> + struct net_device *dev;
> };
>
> +int mlx4_en_xdp_rx_timestamp(const struct xdp_md *ctx, u64 *timestamp)
> +{
> + struct mlx4_en_xdp_buff *_ctx = (void *)ctx;
> +
> + if (unlikely(_ctx->ring->hwtstamp_rx_filter != HWTSTAMP_FILTER_ALL))
> + return -EOPNOTSUPP;
> +
> + *timestamp = mlx4_en_get_hwtstamp(_ctx->mdev,
> + mlx4_en_get_cqe_ts(_ctx->cqe));
> + return 0;
> +}
> +
> +int mlx4_en_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash)
> +{
> + struct mlx4_en_xdp_buff *_ctx = (void *)ctx;
> +
> + if (unlikely(!(_ctx->dev->features & NETIF_F_RXHASH)))
> + return -EOPNOTSUPP;
> +
> + *hash = be32_to_cpu(_ctx->cqe->immed_rss_invalid);
> + return 0;
> +}
> +
> int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget)
> {
> struct mlx4_en_priv *priv = netdev_priv(dev);
> @@ -781,8 +808,12 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
> DMA_FROM_DEVICE);
>
> xdp_prepare_buff(&mxbuf.xdp, va - frags[0].page_offset,
> - frags[0].page_offset, length, false);
> + frags[0].page_offset, length, true);
> orig_data = mxbuf.xdp.data;
> + mxbuf.cqe = cqe;
> + mxbuf.mdev = priv->mdev;
> + mxbuf.ring = ring;
> + mxbuf.dev = dev;
>
> act = bpf_prog_run_xdp(xdp_prog, &mxbuf.xdp);
>
> diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> index e132ff4c82f2..2f8ef0b30083 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> +++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> @@ -788,10 +788,15 @@ void mlx4_en_update_pfc_stats_bitmap(struct mlx4_dev *dev,
> int mlx4_en_netdev_event(struct notifier_block *this,
> unsigned long event, void *ptr);
>
> +struct xdp_md;
> +int mlx4_en_xdp_rx_timestamp(const struct xdp_md *ctx, u64 *timestamp);
> +int mlx4_en_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash);
> +
> /*
> * Functions for time stamping
> */
> u64 mlx4_en_get_cqe_ts(struct mlx4_cqe *cqe);
> +u64 mlx4_en_get_hwtstamp(struct mlx4_en_dev *mdev, u64 timestamp);
> void mlx4_en_fill_hwtstamps(struct mlx4_en_dev *mdev,
> struct skb_shared_hwtstamps *hwts,
> u64 timestamp);
Reviewed-by: Tariq Toukan <tariqt@...dia.com>
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