linux-kernel - Re: [PATCH v3 0/2] Net driver bugs fix

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Date:	Tue, 10 May 2016 14:40:25 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eladkan@...lanox.com
Cc:	noamca@...lanox.com, linux-kernel@...r.kernel.org,
	abrodkin@...opsys.com, netdev@...r.kernel.org
Subject: Re: [PATCH v3 0/2] Net driver bugs fix

From: Elad Kanfi <eladkan@...lanox.com>
Date: Mon, 9 May 2016 20:13:18 +0300

> Summary:
>  1. Bug description: TX done interrupts that arrives while interrupts
>     are masked, during NAPI poll, will not trigger an interrupt handling.
>     Since TX interrupt is of level edge we will lose the TX done interrupt.
>     As a result all pending tx frames will get no service.
> 
>     Solution: Check if there is a pending tx request after unmasking the
>     interrupt and if answer is yes then re-add ourselves to
>     the NAPI poll list.
> 
>  2. Bug description: CPU-A before sending a frame will set a variable
>     to true. CPU-B that executes the tx done interrupt service routine
>     might read a non valid value of that variable.
> 
>     Solution: Use the socket buffer pointer instead of the variable,
>     and add a write memory barrier at the tx sending function after
>     the pointer is set.

Series applied, thanks.