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Date:   Sat, 30 May 2020 02:40:33 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] net: dsa: felix: support half-duplex link modes

On Thu, 28 May 2020 at 12:44, Vladimir Oltean <olteanv@...il.com> wrote:
>
> From: Vladimir Oltean <vladimir.oltean@....com>
>
> Ping tested:
>
> [   11.808455] mscc_felix 0000:00:00.5 swp0: Link is Up - 1Gbps/Full - flow control rx/tx
> [   11.816497] IPv6: ADDRCONF(NETDEV_CHANGE): swp0: link becomes ready
>
> [root@...028ARDB ~] # ethtool -s swp0 advertise 0x4
> [   18.844591] mscc_felix 0000:00:00.5 swp0: Link is Down
> [   22.048337] mscc_felix 0000:00:00.5 swp0: Link is Up - 100Mbps/Half - flow control off
>
> [root@...028ARDB ~] # ip addr add 192.168.1.1/24 dev swp0
>
> [root@...028ARDB ~] # ping 192.168.1.2
> PING 192.168.1.2 (192.168.1.2): 56 data bytes
> (...)
> ^C--- 192.168.1.2 ping statistics ---
> 3 packets transmitted, 3 packets received, 0% packet loss
> round-trip min/avg/max = 0.383/0.611/1.051 ms
>
> [root@...028ARDB ~] # ethtool -s swp0 advertise 0x10
> [  355.637747] mscc_felix 0000:00:00.5 swp0: Link is Down
> [  358.788034] mscc_felix 0000:00:00.5 swp0: Link is Up - 1Gbps/Half - flow control off
>
> [root@...028ARDB ~] # ping 192.168.1.2
> PING 192.168.1.2 (192.168.1.2): 56 data bytes
> (...)
> ^C
> --- 192.168.1.2 ping statistics ---
> 16 packets transmitted, 16 packets received, 0% packet loss
> round-trip min/avg/max = 0.301/0.384/1.138 ms
>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> ---

The commit message of this patch is trimmed when downloading from
patchwork due to the "---" output from ping. I'll resend.

>  drivers/net/dsa/ocelot/felix.c         |  4 +++-
>  drivers/net/dsa/ocelot/felix_vsc9959.c | 13 ++++++++-----
>  2 files changed, 11 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/dsa/ocelot/felix.c b/drivers/net/dsa/ocelot/felix.c
> index 66648986e6e3..e5ec1bf90eb0 100644
> --- a/drivers/net/dsa/ocelot/felix.c
> +++ b/drivers/net/dsa/ocelot/felix.c
> @@ -171,14 +171,16 @@ static void felix_phylink_validate(struct dsa_switch *ds, int port,
>                 return;
>         }
>
> -       /* No half-duplex. */
>         phylink_set_port_modes(mask);
>         phylink_set(mask, Autoneg);
>         phylink_set(mask, Pause);
>         phylink_set(mask, Asym_Pause);
>         phylink_set(mask, 10baseT_Full);
> +       phylink_set(mask, 10baseT_Half);
>         phylink_set(mask, 100baseT_Full);
> +       phylink_set(mask, 100baseT_Half);
>         phylink_set(mask, 1000baseT_Full);
> +       phylink_set(mask, 1000baseT_Half);
>
>         if (state->interface == PHY_INTERFACE_MODE_INTERNAL ||
>             state->interface == PHY_INTERFACE_MODE_2500BASEX ||
> diff --git a/drivers/net/dsa/ocelot/felix_vsc9959.c b/drivers/net/dsa/ocelot/felix_vsc9959.c
> index 1dd9e348152d..e706677bcb01 100644
> --- a/drivers/net/dsa/ocelot/felix_vsc9959.c
> +++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
> @@ -817,12 +817,12 @@ static void vsc9959_pcs_init_sgmii(struct phy_device *pcs,
>
>                 phy_write(pcs, MII_BMCR, BMCR_ANRESTART | BMCR_ANENABLE);
>         } else {
> +               u16 duplex = 0;
>                 int speed;
>
> -               if (state->duplex == DUPLEX_HALF) {
> -                       phydev_err(pcs, "Half duplex not supported\n");
> -                       return;
> -               }
> +               if (state->duplex == DUPLEX_FULL)
> +                       duplex = BMCR_FULLDPLX;
> +
>                 switch (state->speed) {
>                 case SPEED_1000:
>                         speed = ENETC_PCS_SPEED_1000;
> @@ -848,7 +848,7 @@ static void vsc9959_pcs_init_sgmii(struct phy_device *pcs,
>                 /* Yes, not a mistake: speed is given by IF_MODE. */
>                 phy_write(pcs, MII_BMCR, BMCR_RESET |
>                                          BMCR_SPEED1000 |
> -                                        BMCR_FULLDPLX);
> +                                        duplex);
>         }
>  }
>
> @@ -925,8 +925,11 @@ static void vsc9959_pcs_init(struct ocelot *ocelot, int port,
>                                ARRAY_SIZE(phy_basic_ports_array),
>                                pcs->supported);
>         linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, pcs->supported);
> +       linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, pcs->supported);
>         linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, pcs->supported);
> +       linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, pcs->supported);
>         linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, pcs->supported);
> +       linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, pcs->supported);
>         if (pcs->interface == PHY_INTERFACE_MODE_2500BASEX ||
>             pcs->interface == PHY_INTERFACE_MODE_USXGMII)
>                 linkmode_set_bit(ETHTOOL_LINK_MODE_2500baseX_Full_BIT,
> --
> 2.25.1
>

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