linux-kernel - Re: [PATCH] net: hsr: add support for EntryForgetTime

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Date:   Fri, 19 Feb 2021 07:40:44 -0600
From:   George McCollister <george.mccollister@...il.com>
To:     "Wenzel, Marco" <Marco.Wenzel@...berle.de>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Murali Karicheri <m-karicheri2@...com>,
        Taehee Yoo <ap420073@...il.com>,
        Amol Grover <frextrite@...il.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Arvid Brodin <Arvid.Brodin@...n.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: hsr: add support for EntryForgetTime

On Fri, Feb 19, 2021 at 2:27 AM Wenzel, Marco <Marco.Wenzel@...berle.de> wrote:
>
> On Thu, Feb 18, 2021 at 6:06 PM : George McCollister <george.mccollister@...il.com> wrote:
> >
> > On Thu, Feb 18, 2021 at 9:01 AM Marco Wenzel <marco.wenzel@a-
> > eberle.de> wrote:
> > >
> > > In IEC 62439-3 EntryForgetTime is defined with a value of 400 ms. When
> > > a node does not send any frame within this time, the sequence number
> > > check for can be ignored. This solves communication issues with Cisco
> > > IE 2000 in Redbox mode.
> > >
> > > Fixes: f421436a591d ("net/hsr: Add support for the High-availability
> > > Seamless Redundancy protocol (HSRv0)")
> > > Signed-off-by: Marco Wenzel <marco.wenzel@...berle.de>
> > > ---
> > >  net/hsr/hsr_framereg.c | 9 +++++++--
> > >  net/hsr/hsr_framereg.h | 1 +
> > >  net/hsr/hsr_main.h     | 1 +
> > >  3 files changed, 9 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/net/hsr/hsr_framereg.c b/net/hsr/hsr_framereg.c index
> > > 5c97de459905..805f974923b9 100644
> > > --- a/net/hsr/hsr_framereg.c
> > > +++ b/net/hsr/hsr_framereg.c
> > > @@ -164,8 +164,10 @@ static struct hsr_node *hsr_add_node(struct
> > hsr_priv *hsr,
> > >          * as initialization. (0 could trigger an spurious ring error warning).
> > >          */
> > >         now = jiffies;
> > > -       for (i = 0; i < HSR_PT_PORTS; i++)
> > > +       for (i = 0; i < HSR_PT_PORTS; i++) {
> > >                 new_node->time_in[i] = now;
> > > +               new_node->time_out[i] = now;
> > > +       }
> > >         for (i = 0; i < HSR_PT_PORTS; i++)
> > >                 new_node->seq_out[i] = seq_out;
> > >
> > > @@ -411,9 +413,12 @@ void hsr_register_frame_in(struct hsr_node
> > *node,
> > > struct hsr_port *port,  int hsr_register_frame_out(struct hsr_port *port,
> > struct hsr_node *node,
> > >                            u16 sequence_nr)  {
> > > -       if (seq_nr_before_or_eq(sequence_nr, node->seq_out[port->type]))
> > > +       if (seq_nr_before_or_eq(sequence_nr, node->seq_out[port->type])
> > &&
> > > +           time_is_after_jiffies(node->time_out[port->type] +
> > > +           msecs_to_jiffies(HSR_ENTRY_FORGET_TIME)))
> > >                 return 1;
> > >
> > > +       node->time_out[port->type] = jiffies;
> > >         node->seq_out[port->type] = sequence_nr;
> > >         return 0;
> > >  }
> > > diff --git a/net/hsr/hsr_framereg.h b/net/hsr/hsr_framereg.h index
> > > 86b43f539f2c..d9628e7a5f05 100644
> > > --- a/net/hsr/hsr_framereg.h
> > > +++ b/net/hsr/hsr_framereg.h
> > > @@ -75,6 +75,7 @@ struct hsr_node {
> > >         enum hsr_port_type      addr_B_port;
> > >         unsigned long           time_in[HSR_PT_PORTS];
> > >         bool                    time_in_stale[HSR_PT_PORTS];
> > > +       unsigned long           time_out[HSR_PT_PORTS];
> > >         /* if the node is a SAN */
> > >         bool                    san_a;
> > >         bool                    san_b;
> > > diff --git a/net/hsr/hsr_main.h b/net/hsr/hsr_main.h index
> > > 7dc92ce5a134..f79ca55d6986 100644
> > > --- a/net/hsr/hsr_main.h
> > > +++ b/net/hsr/hsr_main.h
> > > @@ -21,6 +21,7 @@
> > >  #define HSR_LIFE_CHECK_INTERVAL                 2000 /* ms */
> > >  #define HSR_NODE_FORGET_TIME           60000 /* ms */
> > >  #define HSR_ANNOUNCE_INTERVAL            100 /* ms */
> > > +#define HSR_ENTRY_FORGET_TIME            400 /* ms */
> > >
> > >  /* By how much may slave1 and slave2 timestamps of latest received
> > frame from
> > >   * each node differ before we notify of communication problem?
> > > --
> > > 2.30.0
> > >
> >
> > scripts/checkpatch.pl gives errors about DOS line endings but once that is
> > resolved this looks good. I tested it on an HSR network with the software
> > implementation and the xrs700x which uses offloading and everything still
> > works. I don't have a way to force anything on the HSR network to reuse
> > sequence numbers after 400ms.
> >
> > Reviewed-by: George McCollister <george.mccollister@...il.com
> > Tested-by: George McCollister <george.mccollister@...il.com
>
> Thank you very much for reviewing, testing and supporting!
>
> Where do you see the incorrect line endings? I just ran scripts/checkpath.pl as git commit hook and it did not report any errors. When I run it again manually, it also does not report any errors:
>
> # ./scripts/checkpatch.pl --strict /tmp/0001-net-hsr-add-support-for-EntryForgetTime.patch
> total: 0 errors, 0 warnings, 0 checks, 38 lines checked
>
> /tmp/0001-net-hsr-add-support-for-EntryForgetTime.patch has no obvious style problems and is ready for submission.

Sorry about this. It seems when I downloaded the patch with Chromium
from gmail in Linux it added DOS new lines (this is unexpected). When
I downloaded it from lore.kernel.org it's fine.

Reviewed-by: George McCollister <george.mccollister@...il.com>
Tested-by: George McCollister <george.mccollister@...il.com>

>
>
> Regards,
> Marco Wenzel