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vhost-user: Implement an empty VHOST_USER_SEND_RARP command

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Passt cannot manage and doesn't need to manage the broadcast of a fake RARP,
but QEMU will report an error message if Passt doesn't implement it.

Implement an empty SEND_RARP command to silence QEMU error message.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Laurent Vivier 2025-01-24 20:07:41 +01:00 • committed by Stefano Brivio
parent d477a1fb03
commit dd6a6854c7
1 changed files with 29 additions and 1 deletions

30
vhost_user.c
View file

@ -914,7 +914,8 @@ static bool vu_get_protocol_features_exec(struct vu_dev *vdev,
{
uint64_t features = 1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK |
1ULL << VHOST_USER_PROTOCOL_F_LOG_SHMFD |
1ULL << VHOST_USER_PROTOCOL_F_DEVICE_STATE;
1ULL << VHOST_USER_PROTOCOL_F_DEVICE_STATE |
1ULL << VHOST_USER_PROTOCOL_F_RARP;
(void)vdev;
vmsg_set_reply_u64(msg, features);
@ -981,6 +982,32 @@ static bool vu_set_vring_enable_exec(struct vu_dev *vdev,
return false;
}
/**
* vu_set_send_rarp_exec() - vhost-user specification says: "Broadcast a fake
* RARP to notify the migration is terminated",
* but passt doesn't need to update any ARP table,
* so do nothing to silence QEMU bogus error message
* @vdev: vhost-user device
* @vmsg: vhost-user message
*
* Return: False as no reply is requested
*/
static bool vu_send_rarp_exec(struct vu_dev *vdev,
struct vhost_user_msg *msg)
{
char macstr[ETH_ADDRSTRLEN];
(void)vdev;
/* ignore the command */
debug("Ignore command VHOST_USER_SEND_RARP for %s",
eth_ntop((unsigned char *)&msg->payload.u64, macstr,
sizeof(macstr)));
return false;
}
/**
* vu_set_migration_watch() - Add the migration file descriptor to epoll
* @vdev: vhost-user device
@ -1177,6 +1204,7 @@ static bool (*vu_handle[VHOST_USER_MAX])(struct vu_dev *vdev,
[VHOST_USER_SET_VRING_CALL] = vu_set_vring_call_exec,
[VHOST_USER_SET_VRING_ERR] = vu_set_vring_err_exec,
[VHOST_USER_SET_VRING_ENABLE] = vu_set_vring_enable_exec,
[VHOST_USER_SEND_RARP] = vu_send_rarp_exec,
[VHOST_USER_SET_DEVICE_STATE_FD] = vu_set_device_state_fd_exec,
[VHOST_USER_CHECK_DEVICE_STATE] = vu_check_device_state_exec,
};