netdev - Re: [RFC net-next 05/14] Fix intel/ixgbevf

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Date:	Tue, 19 Jun 2012 08:39:43 -0700
From:	Alexander Duyck <alexander.h.duyck@...el.com>
To:	Yuval Mintz <yuvalmin@...adcom.com>
CC:	netdev@...r.kernel.org, davem@...emloft.net, eilong@...adcom.com,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: Re: [RFC net-next 05/14] Fix intel/ixgbevf

On 06/19/2012 08:13 AM, Yuval Mintz wrote:
> Signed-off-by: Yuval Mintz <yuvalmin@...adcom.com>
> Signed-off-by: Eilon Greenstein <eilong@...adcom.com>
>
> Cc: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> ---
>  drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c |    5 +++--
>  1 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> index f69ec42..3ad46c2 100644
> --- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> +++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> @@ -2014,7 +2014,7 @@ err_tx_ring_allocation:
>  static int ixgbevf_set_interrupt_capability(struct ixgbevf_adapter *adapter)
>  {
>  	int err = 0;
> -	int vector, v_budget;
> +	int vector, v_budget, ncpu;
>  
>  	/*
>  	 * It's easy to be greedy for MSI-X vectors, but it really
> @@ -2022,8 +2022,9 @@ static int ixgbevf_set_interrupt_capability(struct ixgbevf_adapter *adapter)
>  	 * than CPU's.  So let's be conservative and only ask for
>  	 * (roughly) twice the number of vectors as there are CPU's.
>  	 */
> +	ncpu = min_t(int, num_online_cpus(), DEFAULT_MAX_NUM_RSS_QUEUES);
>  	v_budget = min(adapter->num_rx_queues + adapter->num_tx_queues,
> -		       (int)(num_online_cpus() * 2)) + NON_Q_VECTORS;
> +		       ncpu * 2) + NON_Q_VECTORS;
>  
>  	/* A failure in MSI-X entry allocation isn't fatal, but it does
>  	 * mean we disable MSI-X capabilities of the adapter. */
This change is pointless on the ixgbevf driver.  The VF hardware can
support at most 4 RSS queues.  As such num_rx_queues + num_tx_queues
will never exceed 8 so you are essentially adding a necessary min(x,8).

Thanks,

Alex
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