linux-kernel - Re: [PATCH v2] IB/mlx4: silence GCC warning

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Date:	Sun, 24 Feb 2013 14:34:17 +0200
From:	Jack Morgenstein <jackm@....mellanox.co.il>
To:	Paul Bolle <pebolle@...cali.nl>
Cc:	Roland Dreier <roland@...nel.org>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	Bart Van Assche <bvanassche@....org>,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v2] IB/mlx4: silence GCC warning

On Thursday 21 February 2013 11:02, Paul Bolle wrote:

> diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
> index 19e0637..512fde3 100644
> --- a/drivers/infiniband/hw/mlx4/qp.c
> +++ b/drivers/infiniband/hw/mlx4/qp.c
> @@ -1778,8 +1778,8 @@ static int build_mlx_header(struct mlx4_ib_sqp *sqp, struct ib_send_wr *wr,
>  		}
>  
>  		vlan = rdma_get_vlan_id(&sgid);
> -		is_vlan = vlan < 0x1000;
>  	}
Nice try!
However, this approach does add the line below to processing for an IB port (ETH/RoCE port stays same, more or less).
Processing time is therefore increased (at least on the IB side) relative to just living with the warning.

Roland?

> +	is_vlan = vlan < 0x1000;  <=== Code line added to IB-side processing.

>  	ib_ud_header_init(send_size, !is_eth, is_eth, is_vlan, is_grh, 0, &sqp->ud_header);
>  
>  	if (!is_eth) {

-Jack
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