[dpdk-dev] [PATCH v1] net/vhost: add config option for linear and extbuf

[Sivaprasad Tummala]

Added vHost PMD arguments 'linear-buffer' and 'ext-buffer'
to configure  'RTE_VHOST_USER_LINEARBUF_SUPPORT' and
'RTE_VHOST_USER_EXTBUF_SUPPORT' flags in the vhost library

Signed-off-by: Sivaprasad Tummala <sivaprasad.tumm...@intel.com>
---
 doc/guides/nics/vhost.rst         | 10 ++++++++++
 drivers/net/vhost/rte_eth_vhost.c | 32 ++++++++++++++++++++++++++++++-
 2 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/doc/guides/nics/vhost.rst b/doc/guides/nics/vhost.rst
index 912f4bdd9..d36f3120b 100644
--- a/doc/guides/nics/vhost.rst
+++ b/doc/guides/nics/vhost.rst
@@ -54,6 +54,16 @@ The user can specify below arguments in `--vdev` option.
     It is used to enable tso support in vhost library.
     (Default: 0 (disabled))
 
+#.  ``linear-buffer``:
+
+    It is used to enable linear buffer support in vhost library.
+    (Default: 0 (disabled))
+
+#.  ``ext-buffer``:
+
+    It is used to enable external buffer support in vhost library.
+    (Default: 0 (disabled))
+
 Vhost PMD event handling
 ------------------------
 
diff --git a/drivers/net/vhost/rte_eth_vhost.c 
b/drivers/net/vhost/rte_eth_vhost.c
index a63588986..9f2e85a1b 100644
--- a/drivers/net/vhost/rte_eth_vhost.c
+++ b/drivers/net/vhost/rte_eth_vhost.c
@@ -32,6 +32,8 @@ enum {VIRTIO_RXQ, VIRTIO_TXQ, VIRTIO_QNUM};
 #define ETH_VHOST_IOMMU_SUPPORT                "iommu-support"
 #define ETH_VHOST_POSTCOPY_SUPPORT     "postcopy-support"
 #define ETH_VHOST_VIRTIO_NET_F_HOST_TSO "tso"
+#define ETH_VHOST_LINEAR_BUF  "linear-buffer"
+#define ETH_VHOST_EXT_BUF  "ext-buffer"
 #define VHOST_MAX_PKT_BURST 32
 
 static const char *valid_arguments[] = {
@@ -42,6 +44,8 @@ static const char *valid_arguments[] = {
        ETH_VHOST_IOMMU_SUPPORT,
        ETH_VHOST_POSTCOPY_SUPPORT,
        ETH_VHOST_VIRTIO_NET_F_HOST_TSO,
+       ETH_VHOST_LINEAR_BUF,
+       ETH_VHOST_EXT_BUF,
        NULL
 };
 
@@ -1358,6 +1362,8 @@ rte_pmd_vhost_probe(struct rte_vdev_device *dev)
        int iommu_support = 0;
        int postcopy_support = 0;
        int tso = 0;
+       int linear_buf = 0;
+       int ext_buf = 0;
        struct rte_eth_dev *eth_dev;
        const char *name = rte_vdev_device_name(dev);
 
@@ -1452,6 +1458,28 @@ rte_pmd_vhost_probe(struct rte_vdev_device *dev)
                }
        }
 
+       if (rte_kvargs_count(kvlist, ETH_VHOST_LINEAR_BUF) == 1) {
+               ret = rte_kvargs_process(kvlist,
+                               ETH_VHOST_LINEAR_BUF,
+                               &open_int, &linear_buf);
+               if (ret < 0)
+                       goto out_free;
+
+               if (linear_buf == 1)
+                       flags |= RTE_VHOST_USER_LINEARBUF_SUPPORT;
+       }
+
+       if (rte_kvargs_count(kvlist, ETH_VHOST_EXT_BUF) == 1) {
+               ret = rte_kvargs_process(kvlist,
+                               ETH_VHOST_EXT_BUF,
+                               &open_int, &ext_buf);
+               if (ret < 0)
+                       goto out_free;
+
+               if (ext_buf == 1)
+                       flags |= RTE_VHOST_USER_EXTBUF_SUPPORT;
+       }
+
        if (dev->device.numa_node == SOCKET_ID_ANY)
                dev->device.numa_node = rte_socket_id();
 
@@ -1503,7 +1531,9 @@ RTE_PMD_REGISTER_PARAM_STRING(net_vhost,
        "dequeue-zero-copy=<0|1> "
        "iommu-support=<0|1> "
        "postcopy-support=<0|1> "
-       "tso=<0|1>");
+       "tso=<0|1> "
+       "linear-buffer=<0|1> "
+       "ext-buffer=<0|1>");
 
 RTE_INIT(vhost_init_log)
 {
-- 
2.17.1