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From: Jakub Kicinski <kuba@kernel.org>
To: Vladimir Oltean <olteanv@gmail.com>
Cc: George McCollister <george.mccollister@gmail.com>,
	Andrew Lunn <andrew@lunn.ch>,
	Vivien Didelot <vivien.didelot@gmail.com>,
	Florian Fainelli <f.fainelli@gmail.com>,
	"David S . Miller" <davem@davemloft.net>,
	netdev@vger.kernel.org,
	"open list:OPEN FIRMWARE AND..." <devicetree@vger.kernel.org>
Subject: Re: [PATCH net-next v2 2/3] net: dsa: add Arrow SpeedChips XRS700x driver
Date: Fri, 27 Nov 2020 15:51:35 -0800	[thread overview]
Message-ID: <20201127155135.5beb3106@kicinski-fedora-pc1c0hjn.DHCP.thefacebook.com> (raw)
In-Reply-To: <20201127232140.g6ylpsovaj2tcutr@skbuf>

On Sat, 28 Nov 2020 01:21:40 +0200 Vladimir Oltean wrote:
> On Fri, Nov 27, 2020 at 01:37:53PM -0800, Jakub Kicinski wrote:
> > High speed systems are often eventually consistent. Either because
> > stats are gathered from HW periodically by the FW, or RCU grace period
> > has to expire, or workqueue has to run, etc. etc. I know it's annoying
> > for writing tests but it's manageable.  
> 
> Out of curiosity, what does a test writer need to do to get out of the
> "eventual consistency" conundrum in a portable way and answer the
> question "has my packet not been received by the interface or has the
> counter just not updated"?

Retry for a reasonable amount of time for the system state to converge.
E.g. bpftool_prog_list_wait() in selftests/bpf/test_offloads.py, or
check_tables() in selftests/drivers/net/udp_tunnel_nic.sh.

Sadly I was too lazy to open source the driver tests we built at
Netronome.

  reply	other threads:[~2020-11-27 23:53 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-25 19:37 [PATCH net-next v2 0/3] Arrow SpeedChips XRS700x DSA Driver George McCollister
2020-11-25 19:37 ` [PATCH net-next v2 1/3] dsa: add support for Arrow XRS700x tag trailer George McCollister
2020-11-25 20:34   ` Andrew Lunn
2020-11-26 13:50     ` Vladimir Oltean
2020-11-26 14:01       ` Andrew Lunn
2020-11-26 14:28         ` Vladimir Oltean
2020-11-25 20:34   ` Andrew Lunn
2020-11-26  1:31   ` Florian Fainelli
2020-11-25 19:37 ` [PATCH net-next v2 2/3] net: dsa: add Arrow SpeedChips XRS700x driver George McCollister
2020-11-26  1:42   ` Jakub Kicinski
2020-11-26  2:25     ` George McCollister
2020-11-26 13:24       ` Vladimir Oltean
2020-11-26 17:56         ` Vladimir Oltean
2020-11-26 19:07           ` George McCollister
2020-11-26 22:05             ` Vladimir Oltean
2020-11-27 18:35               ` Jakub Kicinski
     [not found]                 ` <CAFSKS=MAdnR2jzmkQfTnSQZ7GY5x5KJE=oeqPCQdbZdf5n=4ZQ@mail.gmail.com>
2020-11-27 19:50                   ` Vladimir Oltean
2020-11-27 20:58                     ` George McCollister
2020-11-27 21:37                       ` Jakub Kicinski
2020-11-27 22:42                         ` Vladimir Oltean
2020-11-27 23:21                         ` Vladimir Oltean
2020-11-27 23:51                           ` Jakub Kicinski [this message]
2020-11-27 23:30                         ` Andrew Lunn
2020-11-27 23:39                           ` Vladimir Oltean
2020-11-27 23:56                             ` Jakub Kicinski
2020-11-28  1:45                               ` Vladimir Oltean
2020-11-28  0:02                             ` Vladimir Oltean
2020-11-28  0:39                               ` Andrew Lunn
2020-11-28  1:41                                 ` Vladimir Oltean
2020-11-28  2:15                                   ` Jakub Kicinski
2020-11-30 16:52                                     ` George McCollister
2020-11-30 23:50                                       ` Vladimir Oltean
2020-11-30 23:58                                         ` George McCollister
2020-12-01  0:19                                           ` Vladimir Oltean
2020-11-27 20:47                 ` Andrew Lunn
2020-11-27 21:13                   ` Jakub Kicinski
2020-11-27 21:23                     ` Vladimir Oltean
2020-11-27 21:36                       ` Andrew Lunn
2020-12-02  0:28                         ` Vladimir Oltean
2020-12-02  0:54                           ` Jakub Kicinski
2020-11-27 22:03                       ` Jakub Kicinski
2020-11-27 21:32                     ` Andrew Lunn
2020-11-27 22:14                       ` Jakub Kicinski
2020-11-27 22:46                         ` Andrew Lunn
2020-11-25 19:37 ` [PATCH net-next v2 3/3] dt-bindings: net: dsa: add bindings for xrs700x switches George McCollister
2020-11-26  1:30   ` Florian Fainelli

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