From: Marc Smith <msmith626@gmail.com>
To: Logan Gunthorpe <logang@deltatee.com>
Cc: ntb@lists.linux.dev, Kelvin Cao <kelvin.cao@microchip.com>,
kelvincao@outlook.com
Subject: Re: ntb_netdev Communication Failure Issue
Date: Wed, 9 Mar 2022 13:26:04 -0500 [thread overview]
Message-ID: <CAH6h+hfNWgXCguK7xtKCQOm9F_Xc-XCSwRyfrS5nQZGoh7PKFQ@mail.gmail.com> (raw)
In-Reply-To: <0c3b408a-80b2-992d-0a75-f76977dcb4e9@deltatee.com>
On Wed, Mar 9, 2022 at 11:52 AM Logan Gunthorpe <logang@deltatee.com> wrote:
>
>
>
> On 2022-03-09 07:35, Marc Smith wrote:
> > No difference between the two above, and actually, comparing the
> > entire 4 MiB of GAS dump taken while working/functional versus broken
> > state shows no differences:
> > # cmp switchtec0_gas_dump_after_ifup_working.1 switchtec0_gas_dump_broken.1
>
> Well I'm stumped. It looks like the receive side is getting the
> doorbell, but when it reads the memory window the done flag is not set,
> so it doesn't process any packets. The transmit side then fills up the
> memory window and breaks.
>
> So it sounds like the read side is not reading the correct data from the
> memory window. Like it's cache or something (which it shouldn't be). But
> I have no idea what could cause that.
Anything possibly to blame in the PCIe switch firmware that could
cause this? Working with the vendor to ensure we're at the least, but
still TBD at the moment.
--Marc
>
> Logan
next prev parent reply other threads:[~2022-03-09 18:26 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-16 16:16 ntb_netdev Communication Failure Issue Marc Smith
2022-02-16 17:14 ` Logan Gunthorpe
2022-02-17 15:22 ` Marc Smith
2022-02-17 16:31 ` Eric Pilmore
2022-02-17 16:49 ` Logan Gunthorpe
2022-03-09 14:35 ` Marc Smith
2022-03-09 16:52 ` Logan Gunthorpe
2022-03-09 18:26 ` Marc Smith [this message]
2022-03-09 18:31 ` Logan Gunthorpe
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