From: Ouyang Changchun <changchun.ouyang@intel.com>
To: dev@dpdk.org
Subject: [dpdk-dev] [PATCH v2] doc: Update prog guide for virtio
Date: Mon, 2 Mar 2015 16:40:47 +0800 [thread overview]
Message-ID: <1425285647-14975-1-git-send-email-changchun.ouyang@intel.com> (raw)
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
next reply other threads:[~2015-03-02 8:40 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-02 8:40 Ouyang Changchun [this message]
2015-03-02 18:52 ` Butler, Siobhan A
2015-03-17 17:06 ` Thomas Monjalon
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