netdev - Re: [PATCH net-next 4/4] Revert "net: ipv4: handle DSA enabled master network devices"

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Date:   Thu, 28 Jan 2021 01:56:33 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Subject: Re: [PATCH net-next 4/4] Revert "net: ipv4: handle DSA enabled
 master network devices"

On Wed, Jan 27, 2021 at 03:00:28AM +0200, Vladimir Oltean wrote:
> From: Vladimir Oltean <vladimir.oltean@....com>
> 
> This reverts commit 728c02089a0e3eefb02e9927bfae50490f40e72e.
> 
> Since 2015 DSA has gained more integration with the network stack, we
> can now have the same functionality without explicitly open-coding for
> it:
> - It now opens the DSA master netdevice automatically whenever a user
>   netdevice is opened.
> - The master and switch interfaces are coupled in an upper/lower
>   hierarchy using the netdev adjacency lists.
> 
> In the nfsroot example below, the interface chosen by autoconfig was
> swp3, and every interface except that and the DSA master, eth1, was
> brought down afterwards:
> 
> [    8.714215] mscc_felix 0000:00:00.5 swp0 (uninitialized): PHY [0000:00:00.3:10] driver [Microsemi GE VSC8514 SyncE] (irq=POLL)
> [    8.978041] mscc_felix 0000:00:00.5 swp1 (uninitialized): PHY [0000:00:00.3:11] driver [Microsemi GE VSC8514 SyncE] (irq=POLL)
> [    9.246134] mscc_felix 0000:00:00.5 swp2 (uninitialized): PHY [0000:00:00.3:12] driver [Microsemi GE VSC8514 SyncE] (irq=POLL)
> [    9.486203] mscc_felix 0000:00:00.5 swp3 (uninitialized): PHY [0000:00:00.3:13] driver [Microsemi GE VSC8514 SyncE] (irq=POLL)
> [    9.512827] mscc_felix 0000:00:00.5: configuring for fixed/internal link mode
> [    9.521047] mscc_felix 0000:00:00.5: Link is Up - 2.5Gbps/Full - flow control off
> [    9.530382] device eth1 entered promiscuous mode
> [    9.535452] DSA: tree 0 setup
> [    9.539777] printk: console [netcon0] enabled
> [    9.544504] netconsole: network logging started
> [    9.555047] fsl_enetc 0000:00:00.2 eth1: configuring for fixed/internal link mode
> [    9.562790] fsl_enetc 0000:00:00.2 eth1: Link is Up - 1Gbps/Full - flow control off
> [    9.564661] 8021q: adding VLAN 0 to HW filter on device bond0
> [    9.637681] fsl_enetc 0000:00:00.0 eth0: PHY [0000:00:00.0:02] driver [Qualcomm Atheros AR8031/AR8033] (irq=POLL)
> [    9.655679] fsl_enetc 0000:00:00.0 eth0: configuring for inband/sgmii link mode
> [    9.666611] mscc_felix 0000:00:00.5 swp0: configuring for inband/qsgmii link mode
> [    9.676216] 8021q: adding VLAN 0 to HW filter on device swp0
> [    9.682086] mscc_felix 0000:00:00.5 swp1: configuring for inband/qsgmii link mode
> [    9.690700] 8021q: adding VLAN 0 to HW filter on device swp1
> [    9.696538] mscc_felix 0000:00:00.5 swp2: configuring for inband/qsgmii link mode
> [    9.705131] 8021q: adding VLAN 0 to HW filter on device swp2
> [    9.710964] mscc_felix 0000:00:00.5 swp3: configuring for inband/qsgmii link mode
> [    9.719548] 8021q: adding VLAN 0 to HW filter on device swp3
> [    9.747811] Sending DHCP requests ..
> [   12.742899] mscc_felix 0000:00:00.5 swp1: Link is Up - 1Gbps/Full - flow control rx/tx
> [   12.743828] mscc_felix 0000:00:00.5 swp0: Link is Up - 1Gbps/Full - flow control off
> [   12.747062] IPv6: ADDRCONF(NETDEV_CHANGE): swp1: link becomes ready
> [   12.755216] fsl_enetc 0000:00:00.0 eth0: Link is Up - 1Gbps/Full - flow control rx/tx
> [   12.766603] IPv6: ADDRCONF(NETDEV_CHANGE): swp0: link becomes ready
> [   12.783188] mscc_felix 0000:00:00.5 swp2: Link is Up - 1Gbps/Full - flow control rx/tx
> [   12.785354] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
> [   12.799535] IPv6: ADDRCONF(NETDEV_CHANGE): swp2: link becomes ready
> [   13.803141] mscc_felix 0000:00:00.5 swp3: Link is Up - 1Gbps/Full - flow control rx/tx
> [   13.811646] IPv6: ADDRCONF(NETDEV_CHANGE): swp3: link becomes ready
> [   15.452018] ., OK
> [   15.470336] IP-Config: Got DHCP answer from 10.0.0.1, my address is 10.0.0.39
> [   15.477887] IP-Config: Complete:
> [   15.481330]      device=swp3, hwaddr=00:04:9f:05:de:0a, ipaddr=10.0.0.39, mask=255.255.255.0, gw=10.0.0.1
> [   15.491846]      host=10.0.0.39, domain=(none), nis-domain=(none)
> [   15.498429]      bootserver=10.0.0.1, rootserver=10.0.0.1, rootpath=
> [   15.498481]      nameserver0=8.8.8.8
> [   15.627542] fsl_enetc 0000:00:00.0 eth0: Link is Down
> [   15.690903] mscc_felix 0000:00:00.5 swp0: Link is Down
> [   15.745216] mscc_felix 0000:00:00.5 swp1: Link is Down
> [   15.800498] mscc_felix 0000:00:00.5 swp2: Link is Down
> [   15.858143] ALSA device list:
> [   15.861420]   No soundcards found.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew