netdev - RE: [Intel-wired-lan] [PATCH net v4] igb: Allocate MSI-X vector when testing

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Date:   Tue, 29 Nov 2022 14:41:02 +0000
From:   "G, GurucharanX" <gurucharanx.g@...el.com>
To:     Akihiko Odaki <akihiko.odaki@...nix.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Yuri Benditovich" <yuri.benditovich@...nix.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Yan Vugenfirer <yan@...nix.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: RE: [Intel-wired-lan] [PATCH net v4] igb: Allocate MSI-X vector when
 testing



> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of
> Akihiko Odaki
> Sent: Friday, November 25, 2022 7:01 PM
> Cc: netdev@...r.kernel.org; linux-kernel@...r.kernel.org; Yuri Benditovich
> <yuri.benditovich@...nix.com>; Eric Dumazet <edumazet@...gle.com>;
> Jakub Kicinski <kuba@...nel.org>; Yan Vugenfirer <yan@...nix.com>; intel-
> wired-lan@...ts.osuosl.org; Paolo Abeni <pabeni@...hat.com>; David S.
> Miller <davem@...emloft.net>
> Subject: [Intel-wired-lan] [PATCH net v4] igb: Allocate MSI-X vector when
> testing
> 
> Without this change, the interrupt test fail with MSI-X environment:
> 
> $ sudo ethtool -t enp0s2 offline
> [   43.921783] igb 0000:00:02.0: offline testing starting
> [   44.855824] igb 0000:00:02.0 enp0s2: igb: enp0s2 NIC Link is Down
> [   44.961249] igb 0000:00:02.0 enp0s2: igb: enp0s2 NIC Link is Up 1000 Mbps
> Full Duplex, Flow Control: RX/TX
> [   51.272202] igb 0000:00:02.0: testing shared interrupt
> [   56.996975] igb 0000:00:02.0 enp0s2: igb: enp0s2 NIC Link is Up 1000 Mbps
> Full Duplex, Flow Control: RX/TX
> The test result is FAIL
> The test extra info:
> Register test  (offline)	 0
> Eeprom test    (offline)	 0
> Interrupt test (offline)	 4
> Loopback test  (offline)	 0
> Link test   (on/offline)	 0
> 
> Here, "4" means an expected interrupt was not delivered.
> 
> To fix this, route IRQs correctly to the first MSI-X vector by setting
> IVAR_MISC. Also, set bit 0 of EIMS so that the vector will not be masked. The
> interrupt test now runs properly with this change:
> 
> $ sudo ethtool -t enp0s2 offline
> [   42.762985] igb 0000:00:02.0: offline testing starting
> [   50.141967] igb 0000:00:02.0: testing shared interrupt
> [   56.163957] igb 0000:00:02.0 enp0s2: igb: enp0s2 NIC Link is Up 1000 Mbps
> Full Duplex, Flow Control: RX/TX
> The test result is PASS
> The test extra info:
> Register test  (offline)	 0
> Eeprom test    (offline)	 0
> Interrupt test (offline)	 0
> Loopback test  (offline)	 0
> Link test   (on/offline)	 0
> 
> Fixes: 4eefa8f01314 ("igb: add single vector msi-x testing to interrupt test")
> Signed-off-by: Akihiko Odaki <akihiko.odaki@...nix.com>
> ---
> V3 -> V4: Added Fixes: tag
> 
>  drivers/net/ethernet/intel/igb/igb_ethtool.c | 2 ++
>  1 file changed, 2 insertions(+)
> 

Tested-by: Gurucharan G <gurucharanx.g@...el.com> (A Contingent worker at Intel)