From: "Butler, Siobhan A" <siobhan.a.butler@intel.com>
To: "Ouyang, Changchun" <changchun.ouyang@intel.com>,
"dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH v2] doc: Update prog guide for virtio
Date: Mon, 2 Mar 2015 18:52:05 +0000 [thread overview]
Message-ID: <0C5AFCA4B3408848ADF2A3073F7D8CC86D51A9E5@IRSMSX109.ger.corp.intel.com> (raw)
In-Reply-To: <1425285647-14975-1-git-send-email-changchun.ouyang@intel.com>
> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Ouyang Changchun
> Sent: Monday, March 2, 2015 8:41 AM
> To: dev@dpdk.org
> Subject: [dpdk-dev] [PATCH v2] doc: Update prog guide for virtio
>
> This patch add contents for major change in single virtio implementation, also
> add back something for merge-able feature and promiscuous mode in virtio.
>
> Signed-off-by: Changchun Ouyang <changchun.ouyang@intel.com>
> ---
>
> Changes in v2
> -- A few words adjusted.
>
> .../prog_guide/poll_mode_drv_emulated_virtio_nic.rst | 17
> +++++++++++++----
> 1 file changed, 13 insertions(+), 4 deletions(-)
>
> diff --git a/doc/guides/prog_guide/poll_mode_drv_emulated_virtio_nic.rst
> b/doc/guides/prog_guide/poll_mode_drv_emulated_virtio_nic.rst
> index b0a6250..aae32b6 100644
> --- a/doc/guides/prog_guide/poll_mode_drv_emulated_virtio_nic.rst
> +++ b/doc/guides/prog_guide/poll_mode_drv_emulated_virtio_nic.rst
> @@ -68,20 +68,29 @@ Features and Limitations of virtio PMD
>
> In this release, the virtio PMD driver provides the basic functionality of
> packet reception and transmission.
>
> -* This release does not support mergeable buffers per packet for
> performance reasons.
> - The packet size supported is from 64 to 1518.
> - rte_mbuf should be big enough to hold the whole packet.
> +* It supports merge-able buffers per packet when receiving packets and
> scattered buffer per packet
> + when transmitting packets. The packet size supported is from 64 to 1518.
> +
> +* It supports multicast packets and promiscuous mode.
>
> * The descriptor number for the RX/TX queue is hard-coded to be 256 by
> qemu.
> If given a different descriptor number by the upper application,
> the virtio PMD generates a warning and fall back to the hard-coded value.
>
> -* Features such as mac/vlan filter are not supported.
> +* Features of mac/vlan filter are supported, negotiation with
> vhost/backend are needed to support them.
> + When backend can't support vlan filter, virtio app on guest should disable
> vlan filter to make sure
> + the virtio port is configured correctly. E.g. specify '--disable-hw-vlan' in
> testpmd command line.
>
> * RTE_PKTMBUF_HEADROOM should be defined larger than sizeof(struct
> virtio_net_hdr), which is 10 bytes.
>
> * Virtio does not support runtime configuration.
>
> +* Virtio supports Link State interrupt.
> +
> +* Virtio supports software vlan stripping and inserting.
> +
> +* Virtio supports using port IO to get PCI resource when uio/igb_uio
> module is not available.
> +
> Prerequisites
> -------------
>
> --
> 1.8.4.2
Acked-by: Siobhan Butler <siobhan.a.butler@intel.com>
next prev parent reply other threads:[~2015-03-02 18:52 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-02 8:40 Ouyang Changchun
2015-03-02 18:52 ` Butler, Siobhan A [this message]
2015-03-17 17:06 ` Thomas Monjalon
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