net/vhost: add an option to enable dequeue zero copy

Add an option, dequeue-zero-copy, to enable this feature in vhost-pmd.

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Tested-by: Qian Xu <qian.q.xu@intel.com>

diff --git a/drivers/net/vhost/rte_eth_vhost.c b/drivers/net/vhost/rte_eth_vhost.c
index c1d09a0..86c7a4d 100644 (file)
--- a/drivers/net/vhost/rte_eth_vhost.c
+++ b/drivers/net/vhost/rte_eth_vhost.c
@@ -51,6 +51,7 @@
 #define ETH_VHOST_IFACE_ARG            "iface"
 #define ETH_VHOST_QUEUES_ARG           "queues"
 #define ETH_VHOST_CLIENT_ARG           "client"
+#define ETH_VHOST_DEQUEUE_ZERO_COPY    "dequeue-zero-copy"
 
 static const char *drivername = "VHOST PMD";
 
@@ -58,6 +59,7 @@ static const char *valid_arguments[] = {
        ETH_VHOST_IFACE_ARG,
        ETH_VHOST_QUEUES_ARG,
        ETH_VHOST_CLIENT_ARG,
+       ETH_VHOST_DEQUEUE_ZERO_COPY,
        NULL
 };
 
@@ -1132,6 +1134,7 @@ rte_pmd_vhost_probe(const char *name, const char *params)
        uint16_t queues;
        uint64_t flags = 0;
        int client_mode = 0;
+       int dequeue_zero_copy = 0;
 
        RTE_LOG(INFO, PMD, "Initializing pmd_vhost for %s\n", name);
 
@@ -1168,6 +1171,16 @@ rte_pmd_vhost_probe(const char *name, const char *params)
                        flags |= RTE_VHOST_USER_CLIENT;
        }
 
+       if (rte_kvargs_count(kvlist, ETH_VHOST_DEQUEUE_ZERO_COPY) == 1) {
+               ret = rte_kvargs_process(kvlist, ETH_VHOST_DEQUEUE_ZERO_COPY,
+                                        &open_int, &dequeue_zero_copy);
+               if (ret < 0)
+                       goto out_free;
+
+               if (dequeue_zero_copy)
+                       flags |= RTE_VHOST_USER_DEQUEUE_ZERO_COPY;
+       }
+
        eth_dev_vhost_create(name, iface_name, queues, rte_socket_id(), flags);
 
 out_free: