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Message-ID: <20240209192404.GA1430@fastly.com>
Date: Fri, 9 Feb 2024 11:24:04 -0800
From: Joe Damato <jdamato@...tly.com>
To: Rahul Rameshbabu <rrameshbabu@...dia.com>
Cc: Tariq Toukan <ttoukan.linux@...il.com>, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, tariqt@...dia.com,
Saeed Mahameed <saeedm@...dia.com>,
Leon Romanovsky <leon@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Richard Cochran <richardcochran@...il.com>,
Gal Pressman <gal@...dia.com>,
Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
"open list:MELLANOX MLX5 core VPI driver" <linux-rdma@...r.kernel.org>
Subject: Re: [PATCH net-next v3] net/mlx5e: link NAPI instances to queues and
IRQs
On Thu, Feb 08, 2024 at 08:43:57PM -0800, Rahul Rameshbabu wrote:
> On Thu, 08 Feb, 2024 21:13:25 +0200 Tariq Toukan <ttoukan.linux@...il.com> wrote:
> > On 08/02/2024 5:07, Joe Damato wrote:
> >> Make mlx5 compatible with the newly added netlink queue GET APIs.
> >> Signed-off-by: Joe Damato <jdamato@...tly.com>
> >> ---
>
> Just came back from testing this code. Let me make one cosmetic point
> here. I noticed this patch has a line that is past 90 characters. Would
> be nice to get it wrapped in the next version. We use 90 instead of 80
> characters for the line wrap in the mlx5 driver because of firmware
> command interface related code would lead to very hard to read lines if
> wrapped at 80.
>
> https://patchwork.kernel.org/project/netdevbpf/patch/20240208030702.27296-1-jdamato@fastly.com/
OK, I had wrapped them in the next version I was going to send to 80, but
I'll adjust that to 90.
> >> v2 -> v3:
> >> - Fix commit message subject
> >> - call netif_queue_set_napi in mlx5e_ptp_activate_channel and
> >> mlx5e_ptp_deactivate_channel to enable/disable NETDEV_QUEUE_TYPE_RX for
> >> the PTP channel.
> >> - Modify mlx5e_activate_txqsq and mlx5e_deactivate_txqsq to set
> >> NETDEV_QUEUE_TYPE_TX which should take care of all TX queues including
> >> QoS/HTB and PTP.
> >> - Rearrange mlx5e_activate_channel and mlx5e_deactivate_channel for
> >> better ordering when setting and unsetting NETDEV_QUEUE_TYPE_RX NAPI
> >> structs
> >> v1 -> v2:
> >> - Move netlink NULL code to mlx5e_deactivate_channel
> >> - Move netif_napi_set_irq to mlx5e_open_channel and avoid storing the
> >> irq, after netif_napi_add which itself sets the IRQ to -1
> >> drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c | 3 +++
> >> drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 7 +++++++
> >> 2 files changed, 10 insertions(+)
> >> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c
> >> b/drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c
> >> index 078f56a3cbb2..fbbc287d924d 100644
> >> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c
> >> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c
> >> @@ -927,6 +927,8 @@ void mlx5e_ptp_activate_channel(struct mlx5e_ptp *c)
> >> int tc;
> >> napi_enable(&c->napi);
> >> + netif_queue_set_napi(c->netdev, c->rq.ix, NETDEV_QUEUE_TYPE_RX,
> >> + &c->napi);
>
> This should only be set if MLX5E_PTP_STATE_RX is set. Otherwise, the rq
> is not initialized. The following callgraph should help illustrate this.
>
> mlx5e_ptp_open
> |_ mlx5e_ptp_open_queues
> |_ mlx5e_ptp_open_rq
> |_ mlx5e_open_rq
I had made the change that Tariq had suggested in the previous message of
using sq->netdev and sq->cq.napi, but I can also tie that into
MLX5E_PTP_STATE_RX.
I'll add this change as well, test locally again and resend shortly.
> >> if (test_bit(MLX5E_PTP_STATE_TX, c->state)) {
> >> for (tc = 0; tc < c->num_tc; tc++)
> >> @@ -951,6 +953,7 @@ void mlx5e_ptp_deactivate_channel(struct mlx5e_ptp *c)
> >> mlx5e_deactivate_txqsq(&c->ptpsq[tc].txqsq);
> >> }
> >> + netif_queue_set_napi(c->netdev, c->rq.ix, NETDEV_QUEUE_TYPE_RX, NULL);
>
> I believe it would be best to tie this to whether MLX5E_PTP_STATE_RX is
> set or not.
>
> >> napi_disable(&c->napi);
> >> }
> >> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> >> b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> >> index c8e8f512803e..2f1792854dd5 100644
> >> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> >> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> >> @@ -1806,6 +1806,7 @@ void mlx5e_activate_txqsq(struct mlx5e_txqsq *sq)
> >> set_bit(MLX5E_SQ_STATE_ENABLED, &sq->state);
> >> netdev_tx_reset_queue(sq->txq);
> >> netif_tx_start_queue(sq->txq);
> >> + netif_queue_set_napi(sq->channel->netdev, sq->txq_ix, NETDEV_QUEUE_TYPE_TX, &sq->channel->napi);
> >
> > Might be called with channel==NULL.
> > For example for PTP.
> >
> > Prefer sq->netdev and sq->cq.napi.
> >
> >> }
> >> void mlx5e_tx_disable_queue(struct netdev_queue *txq)
> >> @@ -1819,6 +1820,7 @@ void mlx5e_deactivate_txqsq(struct mlx5e_txqsq *sq)
> >> {
> >> struct mlx5_wq_cyc *wq = &sq->wq;
> >> + netif_queue_set_napi(sq->channel->netdev, sq->txq_ix,
> >> NETDEV_QUEUE_TYPE_TX, NULL);
> >
> > Same here.
> >
> >> clear_bit(MLX5E_SQ_STATE_ENABLED, &sq->state);
> >> synchronize_net(); /* Sync with NAPI to prevent netif_tx_wake_queue. */
> >> @@ -2560,6 +2562,7 @@ static int mlx5e_open_channel(struct mlx5e_priv *priv,
> >> int ix,
> >> c->lag_port = mlx5e_enumerate_lag_port(priv->mdev, ix);
> >> netif_napi_add(netdev, &c->napi, mlx5e_napi_poll);
> >> + netif_napi_set_irq(&c->napi, irq);
> >> err = mlx5e_open_queues(c, params, cparam);
> >> if (unlikely(err))
> >> @@ -2602,12 +2605,16 @@ static void mlx5e_activate_channel(struct mlx5e_channel *c)
> >> mlx5e_activate_xsk(c);
> >> else
> >> mlx5e_activate_rq(&c->rq);
> >> +
> >> + netif_queue_set_napi(c->netdev, c->ix, NETDEV_QUEUE_TYPE_RX, &c->napi);
> >> }
> >> static void mlx5e_deactivate_channel(struct mlx5e_channel *c)
> >> {
> >> int tc;
> >> + netif_queue_set_napi(c->netdev, c->ix, NETDEV_QUEUE_TYPE_RX, NULL);
> >> +
> >> if (test_bit(MLX5E_CHANNEL_STATE_XSK, c->state))
> >> mlx5e_deactivate_xsk(c);
> >> else
>
> --
> Thanks,
>
> Rahul Rameshbabu
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