[PATCH bpf-next v5 13/17] net/mlx4_en: Support RX XDP metadata

Stanislav Fomichev
2022-12-20T22:22:48Z

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: John Fastabend <john.fastabend@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Martin KaFai Lau <martin.lau@linux.dev>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Anatoly Burakov <anatoly.burakov@intel.com>
Cc: Alexander Lobakin <alexandr.lobakin@intel.com>
Cc: Magnus Karlsson <magnus.karlsson@gmail.com>
Cc: Maryam Tahhan <mtahhan@redhat.com>
Cc: xdp-hints@xdp-project.net
Cc: netdev@vger.kernel.org
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Stanislav Fomichev <sdf@google.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 3d4226ddba5e..544e09b97483 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
+++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
@@ -796,10 +796,15 @@ 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);
--
2.39.0.314.g84b9a713c41-goog