[dpdk-dev,v2,3/3] net: vhost: add iommu-support parameter to enable IOMMU feature
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Commit Message
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>
---
doc/guides/nics/vhost.rst | 5 +++++
drivers/net/vhost/rte_eth_vhost.c | 13 +++++++++++++
2 files changed, 18 insertions(+)
@@ -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
------------------------
@@ -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();