netdev - Re: [PATCH net-next 2/5] liquidio VF vxlan

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Date:   Sat, 10 Dec 2016 15:46:13 +0200
From:   Or Gerlitz <gerlitz.or@...il.com>
To:     "Vatsavayi, Raghu" <Raghu.Vatsavayi@...ium.com>
Cc:     David Miller <davem@...emloft.net>,
        Linux Netdev List <netdev@...r.kernel.org>,
        "Chickles, Derek" <Derek.Chickles@...ium.com>,
        "Burla, Satananda" <Satananda.Burla@...ium.com>,
        "Manlunas, Felix" <Felix.Manlunas@...ium.com>
Subject: Re: [PATCH net-next 2/5] liquidio VF vxlan

On Fri, Dec 9, 2016 at 12:42 AM, Vatsavayi, Raghu
<Raghu.Vatsavayi@...ium.com> wrote:
>> From: Or Gerlitz [mailto:gerlitz.or@...il.com]
>> On Thu, Dec 8, 2016 at 11:00 PM, Raghu Vatsavayi
>> <rvatsavayi@...iumnetworks.com> wrote:

>>> Adds VF vxlan offload support.

>> What's the use case for that? a VM running a VTEP, isn't that part needs to
>> run @ the host?

> Our HW can support offloads for VF which is required if we load it on Hypervisor.


+       nctrl.ncmd.u64 = 0;
+       nctrl.ncmd.s.cmd = command;
+       nctrl.ncmd.s.more = vxlan_cmd_bit;
+       nctrl.ncmd.s.param1 = vxlan_port;
+       nctrl.iq_no = lio->linfo.txpciq[0].s.q_no;
+       nctrl.wait_time = 100;
+       nctrl.netpndev = (u64)netdev;
+       nctrl.cb_fn = liquidio_link_ctrl_cmd_completion;
+
+       ret = octnet_send_nic_ctrl_pkt(lio->oct_dev, &nctrl);

1. What happens if > 1 one VF runs this code, each with different
port? who wins? is the result well defined?

2. does octnet_send_nic_ctrl_pkt() goes to sleep? this is disallowed here

Or.