netdev - Re: [net-intel-i40e] question about assignment overwrite

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Message-ID: <1495086551.46489.1.camel@intel.com>
Date:   Wed, 17 May 2017 22:49:11 -0700
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Cc:     intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [net-intel-i40e] question about assignment overwrite

On Wed, 2017-05-17 at 15:48 -0500, Gustavo A. R. Silva wrote:
> While looking into Coverity ID 1408956 I ran into the following
> piece  
> of code at drivers/net/ethernet/intel/i40e/i40e_main.c:8807:
> 
> 8807        if (pf->hw.mac.type == I40E_MAC_X722) {
> 8808                pf->flags |= I40E_FLAG_RSS_AQ_CAPABLE
> 8809                             | I40E_FLAG_128_QP_RSS_CAPABLE
> 8810                             | I40E_FLAG_HW_ATR_EVICT_CAPABLE
> 8811                             | I40E_FLAG_OUTER_UDP_CSUM_CAPABLE
> 8812                             | I40E_FLAG_WB_ON_ITR_CAPABLE
> 8813                             |
> I40E_FLAG_MULTIPLE_TCP_UDP_RSS_PCTYPE
> 8814                             | I40E_FLAG_NO_PCI_LINK_CHECK
> 8815                             | I40E_FLAG_USE_SET_LLDP_MIB
> 8816                             | I40E_FLAG_GENEVE_OFFLOAD_CAPABLE
> 8817                             | I40E_FLAG_PTP_L4_CAPABLE
> 8818                             | I40E_FLAG_WOL_MC_MAGIC_PKT_WAKE;
> 8819        } else if ((pf->hw.aq.api_maj_ver > 1) ||
> 8820                   ((pf->hw.aq.api_maj_ver == 1) &&
> 8821                    (pf->hw.aq.api_min_ver > 4))) {
> 8822                /* Supported in FW API version higher than 1.4 */
> 8823                pf->flags |= I40E_FLAG_GENEVE_OFFLOAD_CAPABLE;
> 8824                pf->flags = I40E_FLAG_HW_ATR_EVICT_CAPABLE;
> 8825        } else {
> 8826                pf->flags = I40E_FLAG_HW_ATR_EVICT_CAPABLE;
> 8827        }
> 
> The issue here is that the assignment at line 8823 is overwritten
> by  
> the code at line 8824.
> 
> I'm suspicious that line 8824 should be remove and a patch like the  
> following can be applied:
> 
> index d5c9c9e..48ffa73 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_main.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
> @@ -8821,7 +8821,6 @@ static int i40e_sw_init(struct i40e_pf *pf)
>                      (pf->hw.aq.api_min_ver > 4))) {
>                  /* Supported in FW API version higher than 1.4 */
>                  pf->flags |= I40E_FLAG_GENEVE_OFFLOAD_CAPABLE;
> -               pf->flags = I40E_FLAG_HW_ATR_EVICT_CAPABLE;
>          } else {
>                  pf->flags = I40E_FLAG_HW_ATR_EVICT_CAPABLE;
>          }
> 
> What do you think?

This issue is already fixed in my dev-queue branch on my next-queue
tree.
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