netdev - RE: [PATCH net-next 4/4] qede: Use NETIF_F_GRO

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Date:   Mon, 4 Dec 2017 21:48:24 +0000
From:   Yuval Mintz <yuvalm@...lanox.com>
To:     Michael Chan <michael.chan@...adcom.com>,
        "davem@...emloft.net" <davem@...emloft.net>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Ariel Elior <Ariel.Elior@...ium.com>,
        "everest-linux-l2@...ium.com" <everest-linux-l2@...ium.com>
Subject: RE: [PATCH net-next 4/4] qede: Use NETIF_F_GRO_HW.

> Advertise NETIF_F_GRO_HW and turn on or off hardware GRO based on
> NETIF_F_GRO_FW flag.
> 
> Cc: Ariel Elior <Ariel.Elior@...ium.com>
> Cc: everest-linux-l2@...ium.com
> Signed-off-by: Michael Chan <michael.chan@...adcom.com>
> ---
>  drivers/net/ethernet/qlogic/qede/qede_filter.c | 9 ++-------
>  drivers/net/ethernet/qlogic/qede/qede_main.c   | 4 ++--
>  2 files changed, 4 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/net/ethernet/qlogic/qede/qede_filter.c
> b/drivers/net/ethernet/qlogic/qede/qede_filter.c
> index c1a0708..7ee49b4 100644
> --- a/drivers/net/ethernet/qlogic/qede/qede_filter.c
> +++ b/drivers/net/ethernet/qlogic/qede/qede_filter.c
> @@ -901,13 +901,8 @@ int qede_set_features(struct net_device *dev,
> netdev_features_t features)
>  	netdev_features_t changes = features ^ dev->features;
>  	bool need_reload = false;
> 
> -	/* No action needed if hardware GRO is disabled during driver load */
> -	if (changes & NETIF_F_GRO) {
> -		if (dev->features & NETIF_F_GRO)
> -			need_reload = !edev->gro_disable;
> -		else
> -			need_reload = edev->gro_disable;
> -	}
> +	if (changes & NETIF_F_GRO_HW)
> +		need_reload = true;

This doesn't look right; edev->gro_disable can change due to other
conditions as well - otherwise, it would have been synonymous with 
(dev->features & NETIF_F_GRO).

> 
>  	if (need_reload) {
>  		struct qede_reload_args args;
> diff --git a/drivers/net/ethernet/qlogic/qede/qede_main.c
> b/drivers/net/ethernet/qlogic/qede/qede_main.c
> index 8f9b3eb..b81620e 100644
> --- a/drivers/net/ethernet/qlogic/qede/qede_main.c
> +++ b/drivers/net/ethernet/qlogic/qede/qede_main.c
> @@ -676,7 +676,7 @@ static void qede_init_ndev(struct qede_dev *edev)
>  	ndev->priv_flags |= IFF_UNICAST_FLT;
> 
>  	/* user-changeble features */
> -	hw_features = NETIF_F_GRO | NETIF_F_SG |
> +	hw_features = NETIF_F_GRO | NETIF_F_GRO_HW | NETIF_F_SG |
>  		      NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
>  		      NETIF_F_TSO | NETIF_F_TSO6;
> 
> @@ -1515,7 +1515,7 @@ static void qede_init_fp(struct qede_dev *edev)
>  			 edev->ndev->name, queue_id);
>  	}
> 
> -	edev->gro_disable = !(edev->ndev->features & NETIF_F_GRO);
> +	edev->gro_disable = !(edev->ndev->features & NETIF_F_GRO_HW);
>  }
> 
>  static int qede_set_real_num_queues(struct qede_dev *edev)
> --
> 1.8.3.1