linux-kernel - Re: [RFC PATCH] e1000e: Remove Other from EIAC.

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Message-ID: <20180118072741.hlkepaeibppz7uih@f1.synalogic.ca>
Date:   Thu, 18 Jan 2018 16:27:41 +0900
From:   Benjamin Poirier <benjamin.poirier@...il.com>
To:     Shrikrishna Khare <skhare@...are.com>, pv-drivers@...are.com
Cc:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] e1000e: Remove Other from EIAC.

On 2018/01/18 15:50, Benjamin Poirier wrote:
> It was reported that emulated e1000e devices in vmware esxi 6.5 Build
> 7526125 do not link up after commit 4aea7a5c5e94 ("e1000e: Avoid receiver
> overrun interrupt bursts", v4.15-rc1). Some tracing shows that after
> e1000e_trigger_lsc() is called, ICR reads out as 0x0 in e1000_msix_other()
> on emulated e1000e devices. In comparison, on real e1000e 82574 hardware,
> icr=0x80000004 (_INT_ASSERTED | _OTHER) in the same situation.
> 
> Some experimentation showed that this flaw in vmware e1000e emulation can
> be worked around by not setting Other in EIAC. This is how it was before
> 16ecba59bc33 ("e1000e: Do not read ICR in Other interrupt", v4.5-rc1).

vmware folks, please comment.