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vhost: provide helper for host notifier ctrl

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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>
This commit is contained in:
Xiao Wang 2018-12-18 16:01:59 +08:00 committed by Ferruh Yigit
parent 02e3b285d4
commit 43f34e3566
4 changed files with 23 additions and 6 deletions
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3
drivers/net/ifc/ifcvf_vdpa.c
View File

@ -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;
}

18
lib/librte_vhost/rte_vdpa.h
View File

@ -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_ */

1
lib/librte_vhost/rte_vhost_version.map
View File

@ -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;
};

7
lib/librte_vhost/vhost_user.c
View File

@ -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;