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vhost: support MTU protocol feature

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This patch implements the vhost-user MTU protocol feature support.
When VIRTIO_NET_F_MTU is negotiated, QEMU notifies the vhost-user
backend with the configured MTU if dedicated protocol feature is
supported.

The value can be used by the application to ensure consistency with
value set by the user.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Acked-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
This commit is contained in:
Maxime Coquelin 2017-03-12 17:33:59 +01:00 committed by Yuanhan Liu
parent 3d3c6590b5
commit 23f1e756ca
3 changed files with 29 additions and 1 deletions
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1
lib/librte_vhost/vhost.h
View File

@ -160,6 +160,7 @@ struct virtio_net {
uint64_t log_base;
uint64_t log_addr;
struct ether_addr mac;
uint16_t mtu;
uint32_t nr_guest_pages;
uint32_t max_guest_pages;

24
lib/librte_vhost/vhost_user.c
View File

@ -51,6 +51,9 @@
#include "vhost.h"
#include "vhost_user.h"
#define VIRTIO_MIN_MTU 68
#define VIRTIO_MAX_MTU 65535
static const char *vhost_message_str[VHOST_USER_MAX] = {
[VHOST_USER_NONE] = "VHOST_USER_NONE",
[VHOST_USER_GET_FEATURES] = "VHOST_USER_GET_FEATURES",
@ -72,6 +75,7 @@ static const char *vhost_message_str[VHOST_USER_MAX] = {
[VHOST_USER_GET_QUEUE_NUM] = "VHOST_USER_GET_QUEUE_NUM",
[VHOST_USER_SET_VRING_ENABLE] = "VHOST_USER_SET_VRING_ENABLE",
[VHOST_USER_SEND_RARP] = "VHOST_USER_SEND_RARP",
[VHOST_USER_NET_SET_MTU] = "VHOST_USER_NET_SET_MTU",
};
static uint64_t
@ -852,6 +856,22 @@ vhost_user_send_rarp(struct virtio_net *dev, struct VhostUserMsg *msg)
return 0;
}
static int
vhost_user_net_set_mtu(struct virtio_net *dev, struct VhostUserMsg *msg)
{
if (msg->payload.u64 < VIRTIO_MIN_MTU ||
msg->payload.u64 > VIRTIO_MAX_MTU) {
RTE_LOG(ERR, VHOST_CONFIG, "Invalid MTU size (%"PRIu64")\n",
msg->payload.u64);
return -1;
}
dev->mtu = msg->payload.u64;
return 0;
}
/* return bytes# of read on success or negative val on failure. */
static int
read_vhost_message(int sockfd, struct VhostUserMsg *msg)
@ -1062,6 +1082,10 @@ vhost_user_msg_handler(int vid, int fd)
vhost_user_send_rarp(dev, &msg);
break;
case VHOST_USER_NET_SET_MTU:
ret = vhost_user_net_set_mtu(dev, &msg);
break;
default:
ret = -1;
break;

5
lib/librte_vhost/vhost_user.h
View File

@ -47,11 +47,13 @@
#define VHOST_USER_PROTOCOL_F_LOG_SHMFD 1
#define VHOST_USER_PROTOCOL_F_RARP 2
#define VHOST_USER_PROTOCOL_F_REPLY_ACK 3
#define VHOST_USER_PROTOCOL_F_NET_MTU 4
#define VHOST_USER_PROTOCOL_FEATURES ((1ULL << VHOST_USER_PROTOCOL_F_MQ) | \
(1ULL << VHOST_USER_PROTOCOL_F_LOG_SHMFD) |\
(1ULL << VHOST_USER_PROTOCOL_F_RARP) | \
(1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK))
(1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK) | \
(1ULL << VHOST_USER_PROTOCOL_F_NET_MTU))
typedef enum VhostUserRequest {
VHOST_USER_NONE = 0,
@ -74,6 +76,7 @@ typedef enum VhostUserRequest {
VHOST_USER_GET_QUEUE_NUM = 17,
VHOST_USER_SET_VRING_ENABLE = 18,
VHOST_USER_SEND_RARP = 19,
VHOST_USER_NET_SET_MTU = 20,
VHOST_USER_MAX
} VhostUserRequest;