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net/vhost: add parameter to enable IOMMU feature

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Introduce a new iommu-support parameter to Vhost PMD that
passes the RTE_VHOST_USER_IOMMU_SUPPORT flag at vhost
device register time.

Default value is 0, meaning that IOMMU support is disabled
if not specified explicitly.

Example to enable IOMMU support for a given device:

--vdev 'net_vhost0,iface=/tmp/vhost-user2,iommu-support=1'

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Acked-by: Yuanhan Liu <yliu@fridaylinux.org>
Tested-by: Mark Kavanagh <mark.b.kavanagh@intel.com>
Acked-by: Mark Kavanagh <mark.b.kavanagh@intel.com>
This commit is contained in:
Maxime Coquelin 2017-11-06 21:38:12 +01:00 committed by Thomas Monjalon
parent 002d6a7e55
commit 447e0d3797
2 changed files with 18 additions and 0 deletions
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5
doc/guides/nics/vhost.rst
View File

@ -66,6 +66,11 @@ The user can specify below arguments in `--vdev` option.
It is used to specify the number of queues virtio-net device has.
(Default: 1)
#. ``iommu-support``:
It is used to enable iommu support in vhost library.
(Default: 0 (disabled))
Vhost PMD event handling
------------------------

13
drivers/net/vhost/rte_eth_vhost.c
View File

@ -52,6 +52,7 @@ enum {VIRTIO_RXQ, VIRTIO_TXQ, VIRTIO_QNUM};
#define ETH_VHOST_QUEUES_ARG "queues"
#define ETH_VHOST_CLIENT_ARG "client"
#define ETH_VHOST_DEQUEUE_ZERO_COPY "dequeue-zero-copy"
#define ETH_VHOST_IOMMU_SUPPORT "iommu-support"
#define VHOST_MAX_PKT_BURST 32
static const char *valid_arguments[] = {
@ -59,6 +60,7 @@ static const char *valid_arguments[] = {
ETH_VHOST_QUEUES_ARG,
ETH_VHOST_CLIENT_ARG,
ETH_VHOST_DEQUEUE_ZERO_COPY,
ETH_VHOST_IOMMU_SUPPORT,
NULL
};
@ -1164,6 +1166,7 @@ rte_pmd_vhost_probe(struct rte_vdev_device *dev)
uint64_t flags = 0;
int client_mode = 0;
int dequeue_zero_copy = 0;
int iommu_support = 0;
RTE_LOG(INFO, PMD, "Initializing pmd_vhost for %s\n",
rte_vdev_device_name(dev));
@ -1211,6 +1214,16 @@ rte_pmd_vhost_probe(struct rte_vdev_device *dev)
flags |= RTE_VHOST_USER_DEQUEUE_ZERO_COPY;
}
if (rte_kvargs_count(kvlist, ETH_VHOST_IOMMU_SUPPORT) == 1) {
ret = rte_kvargs_process(kvlist, ETH_VHOST_IOMMU_SUPPORT,
&open_int, &iommu_support);
if (ret < 0)
goto out_free;
if (iommu_support)
flags |= RTE_VHOST_USER_IOMMU_SUPPORT;
}
if (dev->device.numa_node == SOCKET_ID_ANY)
dev->device.numa_node = rte_socket_id();