vhost: provide helper for host notifier ctrl

VDPA driver can decide if it needs to enable/disable the host notifier
mapping, so exposing a API can allow flexibility. A later patch will
base on this.

Signed-off-by: Xiao Wang <xiao.w.wang@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

diff --git a/drivers/net/ifc/ifcvf_vdpa.c b/drivers/net/ifc/ifcvf_vdpa.c
index 97a57f1..e844109 100644 (file)
--- a/drivers/net/ifc/ifcvf_vdpa.c
+++ b/drivers/net/ifc/ifcvf_vdpa.c
@@ -556,6 +556,9 @@ ifcvf_dev_config(int vid)
        rte_atomic32_set(&internal->dev_attached, 1);
        update_datapath(internal);
 
+       if (rte_vhost_host_notifier_ctrl(vid, true) != 0)
+               DRV_LOG(NOTICE, "vDPA (%d): software relay is used.", did);
+
        return 0;
 }
 

diff --git a/lib/librte_vhost/rte_vdpa.h b/lib/librte_vhost/rte_vdpa.h
index a418da4..af40679 100644 (file)
--- a/lib/librte_vhost/rte_vdpa.h
+++ b/lib/librte_vhost/rte_vdpa.h
@@ -11,6 +11,8 @@
  * Device specific vhost lib
  */
 
+#include <stdbool.h>
+
 #include <rte_pci.h>
 #include "rte_vhost.h"
 
@@ -155,4 +157,20 @@ rte_vdpa_get_device(int did);
  */
 int __rte_experimental
 rte_vdpa_get_device_num(void);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Enable/Disable host notifier mapping for a vdpa port.
+ *
+ * @param vid
+ *  vhost device id
+ * @param enable
+ *  true for host notifier map, false for host notifier unmap
+ * @return
+ *  0 on success, -1 on failure
+ */
+int __rte_experimental
+rte_vhost_host_notifier_ctrl(int vid, bool enable);
 #endif /* _RTE_VDPA_H_ */

diff --git a/lib/librte_vhost/rte_vhost_version.map b/lib/librte_vhost/rte_vhost_version.map
index ae39b6e..22302e9 100644 (file)
--- a/lib/librte_vhost/rte_vhost_version.map
+++ b/lib/librte_vhost/rte_vhost_version.map
@@ -83,4 +83,5 @@ EXPERIMENTAL {
        rte_vhost_crypto_finalize_requests;
        rte_vhost_crypto_set_zero_copy;
        rte_vhost_va_from_guest_pa;
+       rte_vhost_host_notifier_ctrl;
 };

diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 5572134..8fec773 100644 (file)
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -2049,11 +2049,6 @@ skip_to_reply:
                if (vdpa_dev->ops->dev_conf)
                        vdpa_dev->ops->dev_conf(dev->vid);
                dev->flags |= VIRTIO_DEV_VDPA_CONFIGURED;
-               if (vhost_user_host_notifier_ctrl(dev->vid, true) != 0) {
-                       RTE_LOG(INFO, VHOST_CONFIG,
-                               "(%d) software relay is used for vDPA, performance may be low.\n",
-                               dev->vid);
-               }
        }
 
        return 0;
@@ -2148,7 +2143,7 @@ static int vhost_user_slave_set_vring_host_notifier(struct virtio_net *dev,
        return process_slave_message_reply(dev, &msg);
 }
 
-int vhost_user_host_notifier_ctrl(int vid, bool enable)
+int rte_vhost_host_notifier_ctrl(int vid, bool enable)
 {
        struct virtio_net *dev;
        struct rte_vdpa_device *vdpa_dev;