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Message-ID: <490d45ff-187a-8e20-7eeb-ce73cfa2e335@gmail.com>
Date: Wed, 29 Sep 2021 13:19:11 +0300
From: Tariq Toukan <ttoukan.linux@...il.com>
To: Joshua Roys <roysjosh@...il.com>, netdev@...r.kernel.org
Cc: ast@...nel.org, davem@...emloft.net, hawk@...nel.org,
john.fastabend@...il.com, daniel@...earbox.net, kuba@...nel.org,
bpf@...r.kernel.org, tariqt@...dia.com, linux-rdma@...r.kernel.org
Subject: Re: [PATCH net-next] net: mlx4: Add XDP_REDIRECT statistics
For changes in the mlx4 ethernet driver, please use "net/mlx4_en" prefix
in patch subject.
On 9/28/2021 4:26 PM, Joshua Roys wrote:
> Address feedback for XDP_REDIRECT patch.
>
Description is not helpful at all.
Please provide technical description of the content, motivation, why it
is needed, etc...
> Signed-off-by: Joshua Roys <roysjosh@...il.com>
> ---
> .../net/ethernet/mellanox/mlx4/en_ethtool.c | 8 ++++++++
> drivers/net/ethernet/mellanox/mlx4/en_port.c | 18 +++++++++++-------
> drivers/net/ethernet/mellanox/mlx4/en_rx.c | 4 +++-
> drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 2 ++
> .../net/ethernet/mellanox/mlx4/mlx4_stats.h | 4 +++-
> 5 files changed, 27 insertions(+), 9 deletions(-)
>
> Tested with VPP 21.06 on Fedora 34.
>
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
> index ef518b1040f7..66c8ae29bc7a 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
> @@ -197,6 +197,8 @@ static const char main_strings[][ETH_GSTRING_LEN] = {
>
> /* xdp statistics */
> "rx_xdp_drop",
> + "rx_xdp_redirect",
> + "rx_xdp_redirect_fail",
> "rx_xdp_tx",
> "rx_xdp_tx_full",
>
> @@ -428,6 +430,8 @@ static void mlx4_en_get_ethtool_stats(struct net_device *dev,
> data[index++] = priv->rx_ring[i]->bytes;
> data[index++] = priv->rx_ring[i]->dropped;
> data[index++] = priv->rx_ring[i]->xdp_drop;
> + data[index++] = priv->rx_ring[i]->xdp_redirect;
> + data[index++] = priv->rx_ring[i]->xdp_redirect_fail;
> data[index++] = priv->rx_ring[i]->xdp_tx;
> data[index++] = priv->rx_ring[i]->xdp_tx_full;
> }
> @@ -519,6 +523,10 @@ static void mlx4_en_get_strings(struct net_device *dev,
> "rx%d_dropped", i);
> sprintf(data + (index++) * ETH_GSTRING_LEN,
> "rx%d_xdp_drop", i);
> + sprintf(data + (index++) * ETH_GSTRING_LEN,
> + "rx%d_xdp_redirect", i);
> + sprintf(data + (index++) * ETH_GSTRING_LEN,
> + "rx%d_xdp_redirect_fail", i);
> sprintf(data + (index++) * ETH_GSTRING_LEN,
> "rx%d_xdp_tx", i);
> sprintf(data + (index++) * ETH_GSTRING_LEN,
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_port.c b/drivers/net/ethernet/mellanox/mlx4/en_port.c
> index 0158b88bea5b..043cc9d75b3e 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_port.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_port.c
> @@ -239,13 +239,15 @@ int mlx4_en_DUMP_ETH_STATS(struct mlx4_en_dev *mdev, u8 port, u8 reset)
>
> mlx4_en_fold_software_stats(dev);
>
> - priv->port_stats.rx_chksum_good = 0;
> - priv->port_stats.rx_chksum_none = 0;
> - priv->port_stats.rx_chksum_complete = 0;
> - priv->port_stats.rx_alloc_pages = 0;
> - priv->xdp_stats.rx_xdp_drop = 0;
> - priv->xdp_stats.rx_xdp_tx = 0;
> - priv->xdp_stats.rx_xdp_tx_full = 0;
> + priv->port_stats.rx_chksum_good = 0;
> + priv->port_stats.rx_chksum_none = 0;
> + priv->port_stats.rx_chksum_complete = 0;
> + priv->port_stats.rx_alloc_pages = 0;
> + priv->xdp_stats.rx_xdp_drop = 0;
> + priv->xdp_stats.rx_xdp_redirect = 0;
> + priv->xdp_stats.rx_xdp_redirect_fail = 0;
> + priv->xdp_stats.rx_xdp_tx = 0;
> + priv->xdp_stats.rx_xdp_tx_full = 0;
No need to touch existing lines.
Add yours without fixing the existing indintations.
> for (i = 0; i < priv->rx_ring_num; i++) {
> const struct mlx4_en_rx_ring *ring = priv->rx_ring[i];
>
> @@ -255,6 +257,8 @@ int mlx4_en_DUMP_ETH_STATS(struct mlx4_en_dev *mdev, u8 port, u8 reset)
> priv->port_stats.rx_chksum_complete += READ_ONCE(ring->csum_complete);
> priv->port_stats.rx_alloc_pages += READ_ONCE(ring->rx_alloc_pages);
> priv->xdp_stats.rx_xdp_drop += READ_ONCE(ring->xdp_drop);
> + priv->xdp_stats.rx_xdp_redirect += READ_ONCE(ring->xdp_redirect);
> + priv->xdp_stats.rx_xdp_redirect_fail += READ_ONCE(ring->xdp_redirect_fail);
> priv->xdp_stats.rx_xdp_tx += READ_ONCE(ring->xdp_tx);
> priv->xdp_stats.rx_xdp_tx_full += READ_ONCE(ring->xdp_tx_full);
> }
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> index 557d7daac2d3..8f09b1de4125 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
> @@ -793,11 +793,13 @@ int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int bud
> case XDP_PASS:
> break;
> case XDP_REDIRECT:
> - if (xdp_do_redirect(dev, &xdp, xdp_prog) >= 0) {
> + if (!xdp_do_redirect(dev, &xdp, xdp_prog)) {
use likely()
> + ring->xdp_redirect++;
> xdp_redir_flush = true;
> frags[0].page = NULL;
> goto next;
> }
> + ring->xdp_redirect_fail++;
> trace_xdp_exception(dev, xdp_prog, act);
> goto xdp_drop_no_cnt;
> case XDP_TX:
> diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> index f3d1a20201ef..f6c90e97b4cd 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> +++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> @@ -340,6 +340,8 @@ struct mlx4_en_rx_ring {
> unsigned long csum_complete;
> unsigned long rx_alloc_pages;
> unsigned long xdp_drop;
> + unsigned long xdp_redirect;
> + unsigned long xdp_redirect_fail;
> unsigned long xdp_tx;
> unsigned long xdp_tx_full;
> unsigned long dropped;
> diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_stats.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_stats.h
> index 7b51ae8cf759..e9cd4bb6f83d 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/mlx4_stats.h
> +++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_stats.h
> @@ -42,9 +42,11 @@ struct mlx4_en_port_stats {
>
> struct mlx4_en_xdp_stats {
> unsigned long rx_xdp_drop;
> + unsigned long rx_xdp_redirect;
> + unsigned long rx_xdp_redirect_fail;
> unsigned long rx_xdp_tx;
> unsigned long rx_xdp_tx_full;
> -#define NUM_XDP_STATS 3
> +#define NUM_XDP_STATS 5
> };
>
> struct mlx4_en_phy_stats {
>
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