linux-kernel - Re: MSI-X msix_entry.vector population

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Message-ID: <20081017182855.GD2137@ldl.fc.hp.com>
Date:	Fri, 17 Oct 2008 12:28:55 -0600
From:	Alex Chiang <achiang@...com>
To:	Anil kumar <anils_r@...oo.com>
Cc:	linux-kernel@...r.kernel.org, linux-pci <linux-pci@...r.kernel.org>
Subject: Re: MSI-X msix_entry.vector population


cc'ing linux-pci

* Anil kumar <anils_r@...oo.com>:
> Hi,
> 
> In the driver, during interrupt registration for MSIX we get
> the vector numbers assigned from the kernel and we associate
> the entry and interrupt handlers with this vector.
> 
> I want to achieve the following logic in the driver: 
> In the queuecommand I assign MSIX vector for each command
> before sending it down. The reason why I want to do this is I
> want to get the response back in that particular MSIX vector
> entry interrupt handler only. For example If I am sending two
> commands down, command1 will have MSIX_vector_1 and command2
> will have MSIX_vector_2. The interrupt handlers registered are
> MSIX_vector_1_Int1 and MSIX_vector_2_Int2. When command is
> complete the response should come back in the respective
> interrupt handlers registered for MSIX_vector_1 and
> MSIX_vector_2 only. 
> 
> To achieve this, I will take msix_entries.[1].vector and assign
> it to command1 in queuecommand and msix_entries.[2].vector and
> assign it to command2.

> 
> Question:
> Now if I have a Dual core CPU, CORE1 and CORE2 each with
> vectors 0 to 4 on them. When I shoot a command with
> msix_entries[1].vector will the completion for this command
> come from CORE1 core vector1 or it can come from CORE2 vector1.
> Is it okay if we get response(triggered interrupt handler) back
> from CORE2. Will I have any routing issues here?
> 
> -or- 
> 
> Is there a way wherein I can call some function to make sure
> that let the kernel assign MSIX.vector for my command in proper
> distributed way in my queuecommand.
> 
> with regards, Anil
> 
>  
> 
> 
>       
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