netdev - Re: [PATCH v3 net-next 07/12] net: ethernet: Add helper to remove a supported link mode

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Message-ID: <20180918130236.GB29092@lunn.ch>
Date:   Tue, 18 Sep 2018 15:02:36 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Simon Horman <horms@...ge.net.au>
Cc:     David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH v3 net-next 07/12] net: ethernet: Add helper to remove a
 supported link mode

> Hi Andrew,

Hi Simon

Thanks for the dumps
 
> 1. net-next: cf7d97e1e54d ("net: mdio: remove duplicated include from mdio_bus.c")
> 
>   basic status: no link
>   capabilities: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
>   advertising:  100baseTx-FD 100baseTx-HD flow-control
>   link partner: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
> 
> 2. net-next with this patch reverted
> 
>   basic status: autonegotiation complete, link ok
>   capabilities: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
>   advertising:  100baseTx-FD 100baseTx-HD
>   link partner: 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD

So flow-control is not present here.

>   basic status: autonegotiation complete, link ok
>   capabilities: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
>   advertising:  100baseTx-FD 100baseTx-HD
>   link partner: 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD

And here also.

Looking at the code, i see:

/* E-MAC init function */
static void ravb_emac_init(struct net_device *ndev)
{
        struct ravb_private *priv = netdev_priv(ndev);

        /* Receive frame limit set register */
        ravb_write(ndev, ndev->mtu + ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN, RFLR);

        /* EMAC Mode: PAUSE prohibition; Duplex; RX Checksum; TX; RX */
        ravb_write(ndev, ECMR_ZPF | (priv->duplex ? ECMR_DM : 0) |
                   (ndev->features & NETIF_F_RXCSUM ? ECMR_RCSC : 0) |
                   ECMR_TE | ECMR_RE, ECMR);

Does this mean Pause is not supported in the hardware?

     Thanks
	Andrew