From: Logan Gunthorpe <logang@deltatee.com>
To: Marc Smith <msmith626@gmail.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 09:52:32 -0700 [thread overview]
Message-ID: <0c3b408a-80b2-992d-0a75-f76977dcb4e9@deltatee.com> (raw)
In-Reply-To: <CAH6h+hd7o7fWFVmPSn86SrgnHC5X_jfdRtn1=dAF=8w8knJK1g@mail.gmail.com>
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.
Logan
next prev parent reply other threads:[~2022-03-09 17:15 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 [this message]
2022-03-09 18:26 ` Marc Smith
2022-03-09 18:31 ` Logan Gunthorpe
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