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Message-ID: <20241101132214.7m65kp434b364apl@DEN-DL-M70577>
Date: Fri, 1 Nov 2024 13:22:14 +0000
From: Daniel Machon <daniel.machon@...rochip.com>
To: Tariq Toukan <tariqt@...dia.com>
CC: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>, Andrew
Lunn <andrew+netdev@...n.ch>, <netdev@...r.kernel.org>, Saeed Mahameed
<saeedm@...dia.com>, Gal Pressman <gal@...dia.com>, Leon Romanovsky
<leonro@...dia.com>, William Tu <witu@...dia.com>, Parav Pandit
<parav@...dia.com>
Subject: Re: [PATCH net-next 5/5] net/mlx5e: do not create xdp_redirect for
non-uplink rep
Hi Tariq, William
> From: William Tu <witu@...dia.com>
>
> XDP and XDP socket require extra SQ/RQ/CQs. Most of these resources
> are dynamically created: no XDP program loaded, no resources are
> created. One exception is the SQ/CQ created for XDP_REDRIECT, used
> for other netdev to forward packet to mlx5 for transmit. The patch
> disables creation of SQ and CQ used for egress XDP_REDIRECT, by
> checking whether ndo_xdp_xmit is set or not.
>
> For netdev without XDP support such as non-uplink representor, this
> saves around 0.35MB of memory, per representor netdevice per channel.
>
> Signed-off-by: William Tu <witu@...dia.com>
> Reviewed-by: Parav Pandit <parav@...dia.com>
> Signed-off-by: Tariq Toukan <tariqt@...dia.com>
> ---
> .../net/ethernet/mellanox/mlx5/core/en_main.c | 17 +++++++++++------
> 1 file changed, 11 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> index 2f609b92d29b..59d7a0e28f24 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> @@ -2514,6 +2514,7 @@ static int mlx5e_open_queues(struct mlx5e_channel *c,
> struct mlx5e_params *params,
> struct mlx5e_channel_param *cparam)
> {
> + const struct net_device_ops *netdev_ops = c->netdev->netdev_ops;
> struct dim_cq_moder icocq_moder = {0, 0};
> struct mlx5e_create_cq_param ccp;
> int err;
> @@ -2534,10 +2535,12 @@ static int mlx5e_open_queues(struct mlx5e_channel *c,
> if (err)
> goto err_close_icosq_cq;
>
> - c->xdpsq = mlx5e_open_xdpredirect_sq(c, params, cparam, &ccp);
> - if (IS_ERR(c->xdpsq)) {
> - err = PTR_ERR(c->xdpsq);
> - goto err_close_tx_cqs;
> + if (netdev_ops->ndo_xdp_xmit) {
Is it possible to have ndo_xdp_xmit() set, but *not* have an XDP prog attached
to the netdevice? I see that c->xdp = !!params->xdp_prog - could that be
used instead?
/Daniel
> + c->xdpsq = mlx5e_open_xdpredirect_sq(c, params, cparam, &ccp);
> + if (IS_ERR(c->xdpsq)) {
> + err = PTR_ERR(c->xdpsq);
> + goto err_close_tx_cqs;
> + }
> }
>
> err = mlx5e_open_cq(c->mdev, params->rx_cq_moderation, &cparam->rq.cqp, &ccp,
> @@ -2601,7 +2604,8 @@ static int mlx5e_open_queues(struct mlx5e_channel *c,
> mlx5e_close_cq(&c->rq.cq);
>
> err_close_xdpredirect_sq:
> - mlx5e_close_xdpredirect_sq(c->xdpsq);
> + if (c->xdpsq)
> + mlx5e_close_xdpredirect_sq(c->xdpsq);
>
> err_close_tx_cqs:
> mlx5e_close_tx_cqs(c);
> @@ -2629,7 +2633,8 @@ static void mlx5e_close_queues(struct mlx5e_channel *c)
> if (c->xdp)
> mlx5e_close_cq(&c->rq_xdpsq.cq);
> mlx5e_close_cq(&c->rq.cq);
> - mlx5e_close_xdpredirect_sq(c->xdpsq);
> + if (c->xdpsq)
> + mlx5e_close_xdpredirect_sq(c->xdpsq);
> mlx5e_close_tx_cqs(c);
> mlx5e_close_cq(&c->icosq.cq);
> mlx5e_close_cq(&c->async_icosq.cq);
> --
> 2.44.0
>
>
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