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Message-ID: <CAKH8qBsuNGu_V+Ww7Ci57J4OrGv=dvGRA=ZEP7RsqLL-SMW29A@mail.gmail.com>
Date: Thu, 8 Dec 2022 11:07:10 -0800
From: Stanislav Fomichev <sdf@...gle.com>
To: Tariq Toukan <ttoukan.linux@...il.com>
Cc: bpf@...r.kernel.org, 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 v3 08/12] mxl4: Support RX XDP metadata
On Wed, Dec 7, 2022 at 10:09 PM Tariq Toukan <ttoukan.linux@...il.com> wrote:
>
> Typo in title mxl4 -> mlx4.
> Preferably: net/mlx4_en.
Oh, I always have to fight with this. Somehow mxl feels more natural
:-) Thanks for spotting, will use net/mlx4_en instead. (presumably the
same should be for mlx5?)
> On 12/6/2022 4:45 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 | 10 +++++
> > drivers/net/ethernet/mellanox/mlx4/en_rx.c | 38 ++++++++++++++++++-
> > drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 1 +
> > include/linux/mlx4/device.h | 7 ++++
> > 5 files changed, 64 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..1cb63746a851 100644
> > --- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> > +++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
> > @@ -2855,6 +2855,11 @@ static const struct net_device_ops mlx4_netdev_ops = {
> > .ndo_features_check = mlx4_en_features_check,
> > .ndo_set_tx_maxrate = mlx4_en_set_tx_maxrate,
> > .ndo_bpf = mlx4_xdp,
> > +
> > + .ndo_xdp_rx_timestamp_supported = mlx4_xdp_rx_timestamp_supported,
> > + .ndo_xdp_rx_timestamp = mlx4_xdp_rx_timestamp,
> > + .ndo_xdp_rx_hash_supported = mlx4_xdp_rx_hash_supported,
> > + .ndo_xdp_rx_hash = mlx4_xdp_rx_hash,
> > };
> >
> > static const struct net_device_ops mlx4_netdev_ops_master = {
> > @@ -2887,6 +2892,11 @@ static const struct net_device_ops mlx4_netdev_ops_master = {
> > .ndo_features_check = mlx4_en_features_check,
> > .ndo_set_tx_maxrate = mlx4_en_set_tx_maxrate,
> > .ndo_bpf = mlx4_xdp,
> > +
> > + .ndo_xdp_rx_timestamp_supported = mlx4_xdp_rx_timestamp_supported,
> > + .ndo_xdp_rx_timestamp = mlx4_xdp_rx_timestamp,
> > + .ndo_xdp_rx_hash_supported = mlx4_xdp_rx_hash_supported,
> > + .ndo_xdp_rx_hash = mlx4_xdp_rx_hash,
> > };
> >
> > struct mlx4_en_bond {
> > diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> > index 9c114fc723e3..1b8e1b2d8729 100644
> > --- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> > +++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> > @@ -663,8 +663,40 @@ static int check_csum(struct mlx4_cqe *cqe, struct sk_buff *skb, void *va,
> >
> > struct mlx4_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;
> > };
> >
> > +bool mlx4_xdp_rx_timestamp_supported(const struct xdp_md *ctx)
> > +{
> > + struct mlx4_xdp_buff *_ctx = (void *)ctx;
> > +
> > + return _ctx->ring->hwtstamp_rx_filter == HWTSTAMP_FILTER_ALL;
> > +}
> > +
> > +u64 mlx4_xdp_rx_timestamp(const struct xdp_md *ctx)
> > +{
> > + struct mlx4_xdp_buff *_ctx = (void *)ctx;
> > +
> > + return mlx4_en_get_hwtstamp(_ctx->mdev, mlx4_en_get_cqe_ts(_ctx->cqe));
> > +}
> > +
> > +bool mlx4_xdp_rx_hash_supported(const struct xdp_md *ctx)
> > +{
> > + struct mlx4_xdp_buff *_ctx = (void *)ctx;
> > +
> > + return _ctx->dev->features & NETIF_F_RXHASH;
> > +}
> > +
> > +u32 mlx4_xdp_rx_hash(const struct xdp_md *ctx)
> > +{
> > + struct mlx4_xdp_buff *_ctx = (void *)ctx;
> > +
> > + return be32_to_cpu(_ctx->cqe->immed_rss_invalid);
> > +}
> > +
> > 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 +813,12 @@ 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..b7c0d4899ad7 100644
> > --- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> > +++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> > @@ -792,6 +792,7 @@ int mlx4_en_netdev_event(struct notifier_block *this,
> > * 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);
> > diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
> > index 6646634a0b9d..d5904da1d490 100644
> > --- a/include/linux/mlx4/device.h
> > +++ b/include/linux/mlx4/device.h
> > @@ -1585,4 +1585,11 @@ static inline int mlx4_get_num_reserved_uar(struct mlx4_dev *dev)
> > /* The first 128 UARs are used for EQ doorbells */
> > return (128 >> (PAGE_SHIFT - dev->uar_page_shift));
> > }
> > +
> > +struct xdp_md;
> > +bool mlx4_xdp_rx_timestamp_supported(const struct xdp_md *ctx);
> > +u64 mlx4_xdp_rx_timestamp(const struct xdp_md *ctx);
> > +bool mlx4_xdp_rx_hash_supported(const struct xdp_md *ctx);
> > +u32 mlx4_xdp_rx_hash(const struct xdp_md *ctx);
> > +
>
> These are ethernet only functions, not known to the mlx4 core driver.
> Please move to mlx4_en.h, and use mlx4_en_xdp_*() prefix.
For sure, thanks for the review!
> > #endif /* MLX4_DEVICE_H */
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