From: "Loftus, Ciara" <ciara.loftus@intel.com>
To: Thomas Monjalon <thomas.monjalon@6wind.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>, Anthony Fee <anthonyx.fee@intel.com>
Subject: Re: [dpdk-dev] [PATCH] vhost: add interface name to virtio-net struct
Date: Thu, 18 Dec 2014 17:01:30 +0000 [thread overview]
Message-ID: <74F120C019F4A64C9B78E802F6AD4CC212578FCB@IRSMSX106.ger.corp.intel.com> (raw)
In-Reply-To: <2861628.6qtiPmT13X@xps13>
Hi Thomas,
A basic vHost use case will work, for example a single Virtual Machine with a vHost port. However normal vSwitching use cases will require the use of multiple vHost ports and multiple VMs. With that in mind, it is essential that the vSwitch has some way of knowing which vHost port it is sending to and receiving packets from. This patch resolves this issue by exposing the tap device name of the vHost device. Without that information we cannot determine the particular vHost port to send/receive from, which in the context of switching, is a critical problem.
Thanks,
Ciara
-----Original Message-----
From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
Sent: Thursday, December 18, 2014 3:33 PM
To: Loftus, Ciara
Cc: dev@dpdk.org; Anthony Fee
Subject: Re: [dpdk-dev] [PATCH] vhost: add interface name to virtio-net struct
2014-12-18 14:55, ciara.loftus@intel.com:
> This patch fixes the issue whereby when using userspace vhost ports in
> the context of vSwitching, the name provided to the hypervisor/QEMU of
> the vhost tap device needs to be exposed in the library, in order for
> the vSwitch to be able to direct packets to the correct device.
Do you mean that vhost was not working at all?
Please precise the context and how it is critical.
More informations are needed to understand wether it should be merged in release 1.8.0 or not.
> --- a/lib/librte_vhost/rte_virtio_net.h
> +++ b/lib/librte_vhost/rte_virtio_net.h
> @@ -96,6 +96,7 @@ struct virtio_net {
> uint64_t features; /**< Negotiated feature set. */
> uint64_t device_fh; /**< device identifier. */
> uint32_t flags; /**< Device flags. Only used to check if device is running on data core. */
> + char ifname[32]; /** Name of the tap device **/
Wrong comment style.
--
Thomas
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next prev parent reply other threads:[~2014-12-18 17:01 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-18 14:55 ciara.loftus
2014-12-18 15:33 ` Thomas Monjalon
2014-12-18 17:01 ` Loftus, Ciara [this message]
2014-12-18 17:16 ` Xie, Huawei
2014-12-18 17:20 ` Czesnowicz, Przemyslaw
2014-12-18 16:20 ` Stephen Hemminger
2014-12-18 16:26 ` Vincent JARDIN
2014-12-18 17:03 ` Ananyev, Konstantin
2014-12-18 18:11 ` Loftus, Ciara
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