linux-next: manual merge of the net-next tree with the net tree

Hi all,

Today's linux-next merge of the net-next tree got a conflict in:

  drivers/net/ethernet/mscc/ocelot.c

between commit:

  a8015ded89ad ("net: mscc: ocelot: properly account for VLAN header length when setting MRU")

from the net tree and commit:

  69df578c5f4b ("net: mscc: ocelot: eliminate confusion between CPU and NPI port")

from the net-next tree.

I fixed it up (I think - see below) and can carry the fix as
necessary. This is now fixed as far as linux-next is concerned, but any
non trivial conflicts should be mentioned to your upstream maintainer
when your tree is submitted for merging.  You may also want to consider
cooperating with the maintainer of the conflicting tree to minimise any
particularly complex conflicts.

Hi Stephen,

On Wed, 11 Mar 2020 at 03:34, Stephen Rothwell <sfr@canb.auug.org.au> wrote:
>
> Hi all,
>
> Today's linux-next merge of the net-next tree got a conflict in:
>
>   drivers/net/ethernet/mscc/ocelot.c
>
> between commit:
>
>   a8015ded89ad ("net: mscc: ocelot: properly account for VLAN header length when setting MRU")
>
> from the net tree and commit:
>
>   69df578c5f4b ("net: mscc: ocelot: eliminate confusion between CPU and NPI port")
>
> from the net-next tree.
>
> I fixed it up (I think - see below) and can carry the fix as
> necessary. This is now fixed as far as linux-next is concerned, but any
> non trivial conflicts should be mentioned to your upstream maintainer
> when your tree is submitted for merging.  You may also want to consider
> cooperating with the maintainer of the conflicting tree to minimise any
> particularly complex conflicts.
>
> --
> Cheers,
> Stephen Rothwell
>
> diff --cc drivers/net/ethernet/mscc/ocelot.c
> index d3b7373c5961,06f9d013f807..000000000000
> --- a/drivers/net/ethernet/mscc/ocelot.c
> +++ b/drivers/net/ethernet/mscc/ocelot.c
> @@@ -2310,27 -2323,34 +2329,34 @@@ void ocelot_configure_cpu(struct ocelo
>                          ANA_PORT_PORT_CFG_PORTID_VAL(cpu),
>                          ANA_PORT_PORT_CFG, cpu);
>
> -       /* If the CPU port is a physical port, set up the port in Node
> -        * Processor Interface (NPI) mode. This is the mode through which
> -        * frames can be injected from and extracted to an external CPU.
> -        * Only one port can be an NPI at the same time.
> -        */
> -       if (cpu < ocelot->num_phys_ports) {
> +       if (npi >= 0 && npi < ocelot->num_phys_ports) {
>  -              int mtu = VLAN_ETH_FRAME_LEN + OCELOT_TAG_LEN;
>  +              int sdu = ETH_DATA_LEN + OCELOT_TAG_LEN;
>
>                 ocelot_write(ocelot, QSYS_EXT_CPU_CFG_EXT_CPUQ_MSK_M |
> -                            QSYS_EXT_CPU_CFG_EXT_CPU_PORT(cpu),
> +                            QSYS_EXT_CPU_CFG_EXT_CPU_PORT(npi),
>                              QSYS_EXT_CPU_CFG);
>
>                 if (injection == OCELOT_TAG_PREFIX_SHORT)
>  -                      mtu += OCELOT_SHORT_PREFIX_LEN;
>  +                      sdu += OCELOT_SHORT_PREFIX_LEN;
>                 else if (injection == OCELOT_TAG_PREFIX_LONG)
>  -                      mtu += OCELOT_LONG_PREFIX_LEN;
>  +                      sdu += OCELOT_LONG_PREFIX_LEN;
>
> -               ocelot_port_set_maxlen(ocelot, cpu, sdu);
>  -              ocelot_port_set_mtu(ocelot, npi, mtu);
> ++              ocelot_port_set_maxlen(ocelot, npi, sdu);
> +
> +               /* Enable NPI port */
> +               ocelot_write_rix(ocelot,
> +                                QSYS_SWITCH_PORT_MODE_INGRESS_DROP_MODE |
> +                                QSYS_SWITCH_PORT_MODE_SCH_NEXT_CFG(1) |
> +                                QSYS_SWITCH_PORT_MODE_PORT_ENA,
> +                                QSYS_SWITCH_PORT_MODE, npi);
> +               /* NPI port Injection/Extraction configuration */
> +               ocelot_write_rix(ocelot,
> +                                SYS_PORT_MODE_INCL_XTR_HDR(extraction) |
> +                                SYS_PORT_MODE_INCL_INJ_HDR(injection),
> +                                SYS_PORT_MODE, npi);
>         }
>
> -       /* CPU port Injection/Extraction configuration */
> +       /* Enable CPU port module */
>         ocelot_write_rix(ocelot, QSYS_SWITCH_PORT_MODE_INGRESS_DROP_MODE |
>                          QSYS_SWITCH_PORT_MODE_SCH_NEXT_CFG(1) |
>                          QSYS_SWITCH_PORT_MODE_PORT_ENA,

What would be the takeaway here? I did bring the fact that it will
conflict to David's attention here, not sure what else should have
been done:
https://www.spinics.net/lists/netdev/msg636207.html
The conflict resolution looks fine btw, I've tested linux-next and it
also works.

Thanks,
-Vladimir

Hi Vladimir,

[Sorry fr the slow response]

On Wed, 11 Mar 2020 11:50:17 +0200 Vladimir Oltean <olteanv@gmail.com> wrote:
>
> What would be the takeaway here? I did bring the fact that it will
> conflict to David's attention here, not sure what else should have
> been done:
> https://www.spinics.net/lists/netdev/msg636207.html
> The conflict resolution looks fine btw, I've tested linux-next and it
> also works.

David has now merged the two trees and resolved this.  My notification
is just so that people are aware of conflicts in separate trees that
usually only come together in Linus' tree.