[dpdk-dev] [PATCH v5 10/10] doc: update ifc NIC document
xiao.w.wang at intel.com
Tue Dec 18 09:02:07 CET 2018
Add the SW assisted VDPA live migration feature into NIC doc.
Signed-off-by: Xiao Wang <xiao.w.wang at intel.com>
doc/guides/nics/ifc.rst | 12 +++++++++++-
doc/guides/rel_notes/release_19_02.rst | 6 ++++++
2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/doc/guides/nics/ifc.rst b/doc/guides/nics/ifc.rst
index 48f9adf1d..bdf7b4e4a 100644
@@ -31,7 +31,8 @@ IFCVF's vendor ID and device ID are same as that of virtio net pci device,
with its specific subsystem vendor ID and device ID. To let the device be
probed by IFCVF driver, adding "vdpa=1" parameter helps to specify that this
device is to be used in vDPA mode, rather than polling mode, virtio pmd will
-skip when it detects this message.
+skip when it detects this message. If no this parameter specified, device
+will not be used as a vDPA device, and it will be driven by virtio pmd.
Different VF devices serve different virtio frontends which are in different
VMs, so each VF needs to have its own DMA address translation service. During
@@ -39,6 +40,14 @@ the driver probe a new container is created for this device, with this
container vDPA driver can program DMA remapping table with the VM's memory
+The device argument "sw-live-migration=1" will configure the driver into SW
+assisted live migration mode. In this mode, the driver will set up a SW relay
+thread when LM happens, this thread will help device to log dirty pages. Thus
+this mode does not require HW to implement a dirty page logging function block,
+but will consume some percentage of CPU resource depending on the network
+throughput. If no this parameter specified, driver will rely on device's logging
Key IFCVF vDPA driver ops
@@ -70,6 +79,7 @@ Features
Features of the IFCVF driver are:
- Compatibility with virtio 0.95 and 1.0.
+- SW assisted vDPA live migration.
diff --git a/doc/guides/rel_notes/release_19_02.rst b/doc/guides/rel_notes/release_19_02.rst
index e86ef9511..131216e19 100644
@@ -60,6 +60,12 @@ New Features
* Added the handler to get firmware version string.
* Added support for multicast filtering.
+* **Added support for SW-assisted VDPA live migration.**
+ This SW-assisted VDPA live migration facility helps VDPA devices without
+ logging capability to perform live migration, a mediated SW relay can help
+ devices to track dirty pages caused by DMA. IFC driver has enabled this
+ SW-assisted live migration mode.
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