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Message-ID: <81aa3232-b706-4931-87a2-13dfed82e9c7@kernel.org>
Date: Mon, 22 Jan 2024 15:42:53 +0200
From: Roger Quadros <rogerq@...nel.org>
To: Diogo Ivo <diogo.ivo@...mens.com>, danishanwar@...com,
davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
pabeni@...hat.com, grygorii.strashko@...com, andrew@...n.ch,
linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org
Cc: Jan Kiszka <jan.kiszka@...mens.com>
Subject: Re: [PATCH v2 6/8] net: ti: icssg-ethtool: Adjust channel count for
SR1.0
On 17/01/2024 18:15, Diogo Ivo wrote:
> SR1.0 uses the highest priority channel to transmit control
> messages to the firmware. Take this into account when computing
> channels.
>
> Based on the work of Roger Quadros in TI's 5.10 SDK [1].
>
> [1]: https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/tree/?h=ti-linux-5.10.y
>
> Co-developed-by: Jan Kiszka <jan.kiszka@...mens.com>
> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
> Signed-off-by: Diogo Ivo <diogo.ivo@...mens.com>
> ---
> drivers/net/ethernet/ti/icssg/icssg_ethtool.c | 10 ++++++++--
> 1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/ti/icssg/icssg_ethtool.c b/drivers/net/ethernet/ti/icssg/icssg_ethtool.c
> index a27ec1dcc8d5..29e67526fa22 100644
> --- a/drivers/net/ethernet/ti/icssg/icssg_ethtool.c
> +++ b/drivers/net/ethernet/ti/icssg/icssg_ethtool.c
> @@ -141,6 +141,9 @@ static int emac_set_channels(struct net_device *ndev,
> return -EBUSY;
>
> emac->tx_ch_num = ch->tx_count;
> + /* highest channel number for management messaging on SR1 */
> + if (emac->is_sr1)
> + emac->tx_ch_num++;
I don't recollect now but is management channel always pinned to the highest priority
channel?
Wouldn't it be better if we don't mix up management channel details here
in emac_get/set_channels(). So this patch is not required and we only need
to set ch->max_tx to PRUETH_MAX_TX_QUEUES-1 for sr1?
>
> return 0;
> }
> @@ -151,9 +154,12 @@ static void emac_get_channels(struct net_device *ndev,
> struct prueth_emac *emac = netdev_priv(ndev);
>
> ch->max_rx = 1;
> - ch->max_tx = PRUETH_MAX_TX_QUEUES;
Leave the above intact and add
if (emac->is_sr1)
ch->max_tx--;
> + /* SR1 use high priority channel for management messages */
> + ch->max_tx = emac->is_sr1 ? PRUETH_MAX_TX_QUEUES - 1 :
> + PRUETH_MAX_TX_QUEUES;
> ch->rx_count = 1;
> - ch->tx_count = emac->tx_ch_num;
> + ch->tx_count = emac->is_sr1 ? emac->tx_ch_num - 1 :
> + emac->tx_ch_num;
> }
>
> static const struct ethtool_rmon_hist_range emac_rmon_ranges[] = {
--
cheers,
-roger
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