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From: Adrian Moreno <amorenoz@redhat.com>
To: dev@dpdk.org
Cc: chenbo.xia@intel.com, zhihong.wang@intel.com, xiao.w.wang@intel.com,
ferruh.yigit@intel.com, maxime.coquelin@redhat.com
Date: Wed, 1 Jul 2020 12:54:00 +0200
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Subject: [dpdk-dev] [PATCH v2 2/2] net/virtio: add reply-ack support to
Virtio-user
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From: Maxime Coquelin <maxime.coquelin@redhat.com>
This patch adds support reply-ack vhost-user protocol
feature, which is for now only used to ensure
VHOST_USER_SET_MEM_TABLE requests are handled by the
slave, but later will be used for VHOST_USER_SET_STATUS.
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
drivers/net/virtio/virtio_user/vhost.h | 6 ++++-
drivers/net/virtio/virtio_user/vhost_user.c | 24 ++++++++++++++++---
.../net/virtio/virtio_user/virtio_user_dev.c | 3 ++-
3 files changed, 28 insertions(+), 5 deletions(-)
diff --git a/drivers/net/virtio/virtio_user/vhost.h b/drivers/net/virtio/virtio_user/vhost.h
index 9ace1a90c..260e1c308 100644
--- a/drivers/net/virtio/virtio_user/vhost.h
+++ b/drivers/net/virtio/virtio_user/vhost.h
@@ -50,7 +50,11 @@ struct vhost_vring_addr {
/** Protocol features. */
#ifndef VHOST_USER_PROTOCOL_F_MQ
-#define VHOST_USER_PROTOCOL_F_MQ 0
+#define VHOST_USER_PROTOCOL_F_MQ 0
+#endif
+
+#ifndef VHOST_USER_PROTOCOL_F_REPLY_ACK
+#define VHOST_USER_PROTOCOL_F_REPLY_ACK 3
#endif
enum vhost_user_request {
diff --git a/drivers/net/virtio/virtio_user/vhost_user.c b/drivers/net/virtio/virtio_user/vhost_user.c
index b68766504..f8d751c98 100644
--- a/drivers/net/virtio/virtio_user/vhost_user.c
+++ b/drivers/net/virtio/virtio_user/vhost_user.c
@@ -32,6 +32,7 @@ struct vhost_user_msg {
#define VHOST_USER_VERSION_MASK 0x3
#define VHOST_USER_REPLY_MASK (0x1 << 2)
+#define VHOST_USER_NEED_REPLY_MASK (0x1 << 3)
uint32_t flags;
uint32_t size; /* the following payload size */
union {
@@ -251,6 +252,7 @@ vhost_user_sock(struct virtio_user_dev *dev,
struct vhost_user_msg msg;
struct vhost_vring_file *file = 0;
int need_reply = 0;
+ int has_reply_ack;
int fds[VHOST_MEMORY_MAX_NREGIONS];
int fd_num = 0;
int len;
@@ -263,6 +265,9 @@ vhost_user_sock(struct virtio_user_dev *dev,
if (dev->is_server && vhostfd < 0)
return -1;
+ if (dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK))
+ has_reply_ack = 1;
+
msg.request = req;
msg.flags = VHOST_USER_VERSION;
msg.size = 0;
@@ -291,6 +296,9 @@ vhost_user_sock(struct virtio_user_dev *dev,
msg.size = sizeof(m.payload.memory.nregions);
msg.size += sizeof(m.payload.memory.padding);
msg.size += fd_num * sizeof(struct vhost_memory_region);
+
+ if (has_reply_ack)
+ msg.flags |= VHOST_USER_NEED_REPLY_MASK;
break;
case VHOST_USER_SET_LOG_FD:
@@ -339,7 +347,7 @@ vhost_user_sock(struct virtio_user_dev *dev,
return -1;
}
- if (need_reply) {
+ if (need_reply || msg.flags & VHOST_USER_NEED_REPLY_MASK) {
if (vhost_user_read(vhostfd, &msg) < 0) {
PMD_DRV_LOG(ERR, "Received msg failed: %s",
strerror(errno));
@@ -369,8 +377,18 @@ vhost_user_sock(struct virtio_user_dev *dev,
sizeof(struct vhost_vring_state));
break;
default:
- PMD_DRV_LOG(ERR, "Received unexpected msg type");
- return -1;
+ /* Reply-ack handling */
+ if (msg.size != sizeof(m.payload.u64)) {
+ PMD_DRV_LOG(ERR, "Received bad msg size");
+ return -1;
+ }
+
+ if (msg.payload.u64 != 0) {
+ PMD_DRV_LOG(ERR, "Slave replied NACK");
+ return -1;
+ }
+
+ break;
}
}
diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c b/drivers/net/virtio/virtio_user/virtio_user_dev.c
index e45159ddd..e94925f9f 100644
--- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
+++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
@@ -423,7 +423,8 @@ virtio_user_dev_setup(struct virtio_user_dev *dev)
1ULL << VHOST_USER_F_PROTOCOL_FEATURES)
#define VIRTIO_USER_SUPPORTED_PROTOCOL_FEATURES \
- (1ULL << VHOST_USER_PROTOCOL_F_MQ)
+ (1ULL << VHOST_USER_PROTOCOL_F_MQ | \
+ 1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK)
int
virtio_user_dev_init(struct virtio_user_dev *dev, char *path, int queues,
--
2.26.2