> -----Original Message-----
> From: Maxime Coquelin <maxime.coque...@redhat.com>
> Sent: Wednesday, January 20, 2021 5:25 AM
> To: dev@dpdk.org; Xia, Chenbo <chenbo....@intel.com>; olivier.m...@6wind.com;
> amore...@redhat.com; david.march...@redhat.com
> Cc: Maxime Coquelin <maxime.coque...@redhat.com>
> Subject: [PATCH v2 39/44] net/virtio: introduce backend data
>
> The goal of this patch is to introduce backend-specific
> data in order to better isolate what is backend-specific
> from what is generic to Virtio-user.
>
> For now, only Vhost-user protocol features are moved to
> Vhost-user backend data.
>
> Signed-off-by: Maxime Coquelin <maxime.coque...@redhat.com>
> ---
> drivers/net/virtio/virtio_user/vhost.h | 1 +
> drivers/net/virtio/virtio_user/vhost_kernel.c | 7 +++
> drivers/net/virtio/virtio_user/vhost_user.c | 62 +++++++++++++++----
> drivers/net/virtio/virtio_user/vhost_vdpa.c | 7 +++
> .../net/virtio/virtio_user/virtio_user_dev.c | 2 +
> .../net/virtio/virtio_user/virtio_user_dev.h | 2 +
> 6 files changed, 68 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/net/virtio/virtio_user/vhost.h
> b/drivers/net/virtio/virtio_user/vhost.h
> index dfa2735a20..fc4f059c02 100644
> --- a/drivers/net/virtio/virtio_user/vhost.h
> +++ b/drivers/net/virtio/virtio_user/vhost.h
> @@ -65,6 +65,7 @@ struct virtio_user_dev;
>
> struct virtio_user_backend_ops {
> int (*setup)(struct virtio_user_dev *dev);
> + int (*destroy)(struct virtio_user_dev *dev);
> int (*get_backend_features)(uint64_t *features);
> int (*set_owner)(struct virtio_user_dev *dev);
> int (*get_features)(struct virtio_user_dev *dev, uint64_t *features);
> diff --git a/drivers/net/virtio/virtio_user/vhost_kernel.c
> b/drivers/net/virtio/virtio_user/vhost_kernel.c
> index 5477eb7015..47fb4427be 100644
> --- a/drivers/net/virtio/virtio_user/vhost_kernel.c
> +++ b/drivers/net/virtio/virtio_user/vhost_kernel.c
> @@ -357,6 +357,12 @@ vhost_kernel_setup(struct virtio_user_dev *dev)
> return 0;
> }
>
> +static int
> +vhost_kernel_destroy(struct virtio_user_dev *dev __rte_unused)
> +{
> + return 0;
> +}
> +
> static int
> vhost_kernel_set_backend(int vhostfd, int tapfd)
> {
> @@ -455,6 +461,7 @@ vhost_kernel_get_backend_features(uint64_t *features)
>
> struct virtio_user_backend_ops virtio_ops_kernel = {
> .setup = vhost_kernel_setup,
> + .destroy = vhost_kernel_destroy,
> .get_backend_features = vhost_kernel_get_backend_features,
> .set_owner = vhost_kernel_set_owner,
> .get_features = vhost_kernel_get_features,
> diff --git a/drivers/net/virtio/virtio_user/vhost_user.c
> b/drivers/net/virtio/virtio_user/vhost_user.c
> index 986d8ac1ac..0147b6d963 100644
> --- a/drivers/net/virtio/virtio_user/vhost_user.c
> +++ b/drivers/net/virtio/virtio_user/vhost_user.c
> @@ -17,6 +17,9 @@
> #include "vhost.h"
> #include "virtio_user_dev.h"
>
> +struct vhost_user_data {
> + uint64_t protocol_features;
> +};
>
> #ifndef VHOST_USER_F_PROTOCOL_FEATURES
> #define VHOST_USER_F_PROTOCOL_FEATURES 30
> @@ -287,6 +290,7 @@ static int
> vhost_user_get_features(struct virtio_user_dev *dev, uint64_t *features)
> {
> int ret;
> + struct vhost_user_data *data = dev->backend_data;
> struct vhost_user_msg msg = {
> .request = VHOST_USER_GET_FEATURES,
> .flags = VHOST_USER_VERSION,
> @@ -316,17 +320,17 @@ vhost_user_get_features(struct virtio_user_dev *dev,
> uint64_t *features)
> return 0;
>
> /* Negotiate protocol features */
> - ret = vhost_user_get_protocol_features(dev, &dev->protocol_features);
> + ret = vhost_user_get_protocol_features(dev, &data->protocol_features);
> if (ret < 0)
> goto err;
>
> - dev->protocol_features &= VHOST_USER_SUPPORTED_PROTOCOL_FEATURES;
> + data->protocol_features &= VHOST_USER_SUPPORTED_PROTOCOL_FEATURES;
>
> - ret = vhost_user_set_protocol_features(dev, dev->protocol_features);
> + ret = vhost_user_set_protocol_features(dev, data->protocol_features);
> if (ret < 0)
> goto err;
>
> - if (!(dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_MQ)))
> + if (!(data->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_MQ)))
> dev->unsupported_features |= (1ull << VIRTIO_NET_F_MQ);
>
> return 0;
> @@ -444,12 +448,13 @@ vhost_user_set_memory_table(struct virtio_user_dev *dev)
> struct walk_arg wa;
> int fds[VHOST_MEMORY_MAX_NREGIONS];
> int ret, fd_num;
> + struct vhost_user_data *data = dev->backend_data;
> struct vhost_user_msg msg = {
> .request = VHOST_USER_SET_MEM_TABLE,
> .flags = VHOST_USER_VERSION,
> };
>
> - if (dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK))
> + if (data->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK))
> msg.flags |= VHOST_USER_NEED_REPLY_MASK;
>
> wa.region_nr = 0;
> @@ -628,6 +633,7 @@ static int
> vhost_user_get_status(struct virtio_user_dev *dev, uint8_t *status)
> {
> int ret;
> + struct vhost_user_data *data = dev->backend_data;
> struct vhost_user_msg msg = {
> .request = VHOST_USER_GET_STATUS,
> .flags = VHOST_USER_VERSION,
> @@ -644,7 +650,7 @@ vhost_user_get_status(struct virtio_user_dev *dev, uint8_t
> *status)
> if (!(dev->device_features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES)))
> return -ENOTSUP;
>
> - if (!(dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_STATUS)))
> + if (!(data->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_STATUS)))
> return -ENOTSUP;
>
> ret = vhost_user_write(dev->vhostfd, &msg, NULL, 0);
> @@ -681,6 +687,7 @@ static int
> vhost_user_set_status(struct virtio_user_dev *dev, uint8_t status)
> {
> int ret;
> + struct vhost_user_data *data = dev->backend_data;
> struct vhost_user_msg msg = {
> .request = VHOST_USER_SET_STATUS,
> .flags = VHOST_USER_VERSION,
> @@ -699,10 +706,10 @@ vhost_user_set_status(struct virtio_user_dev *dev,
> uint8_t status)
> if (!(dev->device_features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES)))
> return -ENOTSUP;
>
> - if (!(dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_STATUS)))
> + if (!(data->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_STATUS)))
> return -ENOTSUP;
>
> - if (dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK))
> + if (data->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK))
> msg.flags |= VHOST_USER_NEED_REPLY_MASK;
>
> ret = vhost_user_write(dev->vhostfd, &msg, NULL, 0);
> @@ -762,11 +769,22 @@ vhost_user_setup(struct virtio_user_dev *dev)
> int fd;
> int flag;
> struct sockaddr_un un;
> + struct vhost_user_data *data;
> +
> + data = malloc(sizeof(*data));
> + if (!data) {
> + PMD_DRV_LOG(ERR, "(%s) Failed to allocate Vhost-user data\n",
> dev-
> >path);
> + return -1;
> + }
> +
> + memset(data, 0, sizeof(*data));
> +
> + dev->backend_data = data;
>
> fd = socket(AF_UNIX, SOCK_STREAM, 0);
> if (fd < 0) {
> PMD_DRV_LOG(ERR, "socket() error, %s", strerror(errno));
> - return -1;
> + goto err_data;
> }
>
> flag = fcntl(fd, F_GETFD);
> @@ -781,18 +799,35 @@ vhost_user_setup(struct virtio_user_dev *dev)
> dev->listenfd = fd;
> if (virtio_user_start_server(dev, &un) < 0) {
> PMD_DRV_LOG(ERR, "virtio-user startup fails in server
> mode");
> - close(fd);
> - return -1;
> + goto err_socket;
> }
> } else {
> if (connect(fd, (struct sockaddr *)&un, sizeof(un)) < 0) {
> PMD_DRV_LOG(ERR, "connect error, %s", strerror(errno));
> - close(fd);
> - return -1;
> + goto err_socket;
> }
> dev->vhostfd = fd;
> }
>
> + return 0;
> +
> +err_socket:
> + close(fd);
> +err_data:
> + free(data);
> + dev->backend_data = NULL;
> +
> + return -1;
> +}
> +
> +static int
> +vhost_user_destroy(struct virtio_user_dev *dev)
> +{
> + if (dev->backend_data) {
> + free(dev->backend_data);
> + dev->backend_data = NULL;
> + }
> +
> return 0;
> }
>
> @@ -830,6 +865,7 @@ vhost_user_get_backend_features(uint64_t *features)
>
> struct virtio_user_backend_ops virtio_ops_user = {
> .setup = vhost_user_setup,
> + .destroy = vhost_user_destroy,
> .get_backend_features = vhost_user_get_backend_features,
> .set_owner = vhost_user_set_owner,
> .get_features = vhost_user_get_features,
> diff --git a/drivers/net/virtio/virtio_user/vhost_vdpa.c
> b/drivers/net/virtio/virtio_user/vhost_vdpa.c
> index 8d354b298e..f5a8943993 100644
> --- a/drivers/net/virtio/virtio_user/vhost_vdpa.c
> +++ b/drivers/net/virtio/virtio_user/vhost_vdpa.c
> @@ -432,6 +432,12 @@ vhost_vdpa_setup(struct virtio_user_dev *dev)
> return 0;
> }
>
> +static int
> +vhost_vdpa_destroy(struct virtio_user_dev *dev __rte_unused)
> +{
> + return 0;
> +}
> +
> static int
> vhost_vdpa_enable_queue_pair(struct virtio_user_dev *dev,
> uint16_t pair_idx,
> @@ -467,6 +473,7 @@ vhost_vdpa_get_backend_features(uint64_t *features)
>
> struct virtio_user_backend_ops virtio_ops_vdpa = {
> .setup = vhost_vdpa_setup,
> + .destroy = vhost_vdpa_destroy,
> .get_backend_features = vhost_vdpa_get_backend_features,
> .set_owner = vhost_vdpa_set_owner,
> .get_features = vhost_vdpa_get_features,
> diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c
> b/drivers/net/virtio/virtio_user/virtio_user_dev.c
> index 2614bcb349..215819d46d 100644
> --- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
> +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
> @@ -621,6 +621,8 @@ virtio_user_dev_uninit(struct virtio_user_dev *dev)
>
> if (dev->is_server)
> unlink(dev->path);
> +
> + dev->ops->destroy(dev);
> }
>
> uint8_t
> diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.h
> b/drivers/net/virtio/virtio_user/virtio_user_dev.h
> index ab62463a5b..7650097b6d 100644
> --- a/drivers/net/virtio/virtio_user/virtio_user_dev.h
> +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.h
> @@ -66,6 +66,8 @@ struct virtio_user_dev {
> struct virtio_user_backend_ops *ops;
> pthread_mutex_t mutex;
> bool started;
> +
> + void *backend_data;
> };
>
> int virtio_user_dev_set_features(struct virtio_user_dev *dev);
> --
> 2.29.2
Reviewed-by: Chenbo Xia <chenbo....@intel.com>
