[dpdk-dev,v3,2/9] vhost: vhost-user: Add MTU protocol feature support
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Commit Message
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>
---
lib/librte_vhost/vhost.h | 1 +
lib/librte_vhost/vhost_user.c | 24 ++++++++++++++++++++++++
lib/librte_vhost/vhost_user.h | 5 ++++-
3 files changed, 29 insertions(+), 1 deletion(-)
@@ -170,6 +170,7 @@ 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;
@@ -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
@@ -865,6 +869,22 @@ 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)
@@ -1027,6 +1047,10 @@ 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;
@@ -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;