netdev - Re: [PATCH net-next v2 2/2] be2net: csum, tso and rss steering offload support for VxLAN

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Date:	Mon, 24 Mar 2014 08:52:07 +0200
From:	Or Gerlitz <or.gerlitz@...il.com>
To:	Sathya Perla <sathya.perla@...lex.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2 2/2] be2net: csum, tso and rss steering
 offload support for VxLAN

On Mon, Mar 24, 2014 at 8:00 AM, Sathya Perla <sathya.perla@...lex.com> wrote:
> This patch mainly implements the add/del_vxlan_port() methods by invoking
> the needed FW cmds for supporting VxLAN offloads for Skyhawk-R.

[...]
> +static void be_add_vxlan_port(struct net_device *netdev, sa_family_t sa_family,
> +                             __be16 port)
> +{
> +       struct be_adapter *adapter = netdev_priv(netdev);
> +       struct device *dev = &adapter->pdev->dev;
> +       int status;
> +
> +       if (lancer_chip(adapter) || BEx_chip(adapter))
> +               return;
> +
> +       if (adapter->flags & BE_FLAGS_VXLAN_OFFLOADS) {
> +               dev_warn(dev, "Cannot add UDP port %d for VxLAN offloads\n",
> +                        be16_to_cpu(port));
> +               dev_info(dev,
> +                        "Only one UDP port supported for VxLAN offloads\n");
> +               return;
> +       }
> +
> +       status = be_cmd_manage_iface(adapter, adapter->if_handle,
> +                                    OP_CONVERT_NORMAL_TO_TUNNEL);
> +       if (status) {
> +               dev_warn(dev, "Failed to convert normal interface to tunnel\n");
> +               goto err;
> +       }
> +
> +       status = be_cmd_set_vxlan_port(adapter, port);

so the flow be_cmd_set_vxlan_port --> be_cmd_set_profile_config goes
to sleep, right? well, it's wrong doing it from  here since the ndo is
called from the vxlan driver under spinlock, you should easily get a
nice stack trace if you test your code with spinlock/atomic debugging
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