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Date: Thu, 8 Dec 2022 22:23:57 +0200
From: Tariq Toukan <ttoukan.linux@...il.com>
To: Stanislav Fomichev <sdf@...gle.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 12/8/2022 9:07 PM, Stanislav Fomichev wrote:
> 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?)
>
For the newer mlx5 driver we use a shorter form, net/mlx5e.
>> 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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