From: Adrian Moreno <amorenoz@redhat.com>
To: Maxime Coquelin <maxime.coquelin@redhat.com>,
dev@dpdk.org, chenbo.xia@intel.com, olivier.matz@6wind.com,
david.marchand@redhat.com
Subject: Re: [dpdk-dev] [PATCH 37/40] net/virtio: introduce backend data
Date: Wed, 13 Jan 2021 18:18:40 +0100 [thread overview]
Message-ID: <c8f3889b-ac34-46b6-90ca-08ba2b744f86@redhat.com> (raw)
In-Reply-To: <20201220211405.313012-38-maxime.coquelin@redhat.com>
On 12/20/20 10:14 PM, Maxime Coquelin wrote:
> 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.coquelin@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 | 46 +++++++++++++++----
> drivers/net/virtio/virtio_user/vhost_vdpa.c | 8 ++++
> .../net/virtio/virtio_user/virtio_user_dev.c | 2 +
> .../net/virtio/virtio_user/virtio_user_dev.h | 3 +-
> 6 files changed, 58 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/net/virtio/virtio_user/vhost.h b/drivers/net/virtio/virtio_user/vhost.h
> index b488ac78a1..ee5598226d 100644
> --- a/drivers/net/virtio/virtio_user/vhost.h
> +++ b/drivers/net/virtio/virtio_user/vhost.h
> @@ -57,6 +57,7 @@ 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 2fd00afa84..023fddcd69 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)
> +{
> + 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 f67c40e047..e96b1d8b9c 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
> @@ -274,6 +277,7 @@ 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,
> @@ -303,17 +307,17 @@ 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;
> @@ -429,12 +433,13 @@ 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;
> @@ -613,6 +618,7 @@ 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,
> @@ -629,7 +635,7 @@ 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);
> @@ -666,6 +672,7 @@ 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,
> @@ -673,7 +680,7 @@ vhost_user_set_status(struct virtio_user_dev *dev, uint8_t status)
> .payload.u64 = status,
> };
>
> - 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;
>
> /*
> @@ -687,7 +694,7 @@ 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;
>
> ret = vhost_user_write(dev->vhostfd, &msg, NULL, 0);
> @@ -747,6 +754,17 @@ 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) {
There are a number of "return -1;" statements below which, if executed, would
now leak.
Also, there are two in virtio_user_dev.c:virtio_user_dev_setup()
> @@ -781,6 +799,17 @@ vhost_user_setup(struct virtio_user_dev *dev)
> return 0;
> }
>
> +static int
> +vhost_user_destroy(struct virtio_user_dev *dev)
> +{
> + if (dev->backend_data) {
> + free(dev->backend_data);
> + dev->backend_data = NULL;
> + }
> +
> + return 0;
> +}
> +
> static int
> vhost_user_enable_queue_pair(struct virtio_user_dev *dev,
> uint16_t pair_idx,
> @@ -815,6 +844,7 @@ 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 c826f333e0..b29426d767 100644
> --- a/drivers/net/virtio/virtio_user/vhost_vdpa.c
> +++ b/drivers/net/virtio/virtio_user/vhost_vdpa.c
> @@ -287,6 +287,13 @@ vhost_vdpa_setup(struct virtio_user_dev *dev)
> return 0;
> }
>
> +static int
> +vhost_vdpa_destroy(struct virtio_user_dev *dev __rte_unused)
> +{
> + return;
> + return 0;
> +}
> +
> static int
> vhost_vdpa_enable_queue_pair(struct virtio_user_dev *dev,
> uint16_t pair_idx,
> @@ -322,6 +329,7 @@ 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 974de133bc..8d19a0addd 100644
> --- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
> +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
> @@ -620,6 +620,8 @@ 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 b2da2944e9..ec73d5de11 100644
> --- a/drivers/net/virtio/virtio_user/virtio_user_dev.h
> +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.h
> @@ -30,7 +30,6 @@ struct virtio_user_dev {
> int vhostfd;
> int listenfd; /* listening fd */
> bool is_server; /* server or client mode */
> - uint64_t protocol_features; /* negotiated protocol features*/
>
> /* for vhost_kernel backend */
> char *ifname;
> @@ -66,6 +65,8 @@ 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);
>
--
Adrián Moreno
next prev parent reply other threads:[~2021-01-13 17:18 UTC|newest]
Thread overview: 149+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-20 21:13 [dpdk-dev] [PATCH 00/40] net/virtio: Virtio PMD rework Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 01/40] bus/vdev: add helper to get vdev from eth dev Maxime Coquelin
2020-12-30 3:02 ` Xia, Chenbo
2021-01-05 21:15 ` David Marchand
2020-12-20 21:13 ` [dpdk-dev] [PATCH 02/40] net/virtio: Introduce Virtio bus type Maxime Coquelin
2020-12-30 3:02 ` Xia, Chenbo
2021-01-05 21:15 ` David Marchand
2021-01-14 9:24 ` Maxime Coquelin
2021-01-14 10:54 ` Maxime Coquelin
2021-01-14 11:55 ` David Marchand
2020-12-20 21:13 ` [dpdk-dev] [PATCH 03/40] net/virtio: refactor virtio-user device Maxime Coquelin
2020-12-30 3:02 ` Xia, Chenbo
2021-01-05 21:16 ` David Marchand
2021-01-14 9:26 ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 04/40] net/virtio: introduce PCI device metadata Maxime Coquelin
2020-12-30 3:02 ` Xia, Chenbo
2021-01-05 21:16 ` David Marchand
2021-01-14 11:05 ` Maxime Coquelin
2021-01-14 14:40 ` David Marchand
2021-01-14 14:44 ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 05/40] net/virtio: move PCI device init in dedicated file Maxime Coquelin
2020-12-30 3:02 ` Xia, Chenbo
2021-01-05 21:19 ` David Marchand
2021-01-14 16:04 ` Maxime Coquelin
2021-01-14 16:14 ` David Marchand
2020-12-20 21:13 ` [dpdk-dev] [PATCH 06/40] net/virtio: move PCI specific dev init to PCI ethdev init Maxime Coquelin
2020-12-30 3:05 ` Xia, Chenbo
2021-01-06 8:58 ` David Marchand
2020-12-20 21:13 ` [dpdk-dev] [PATCH 07/40] net/virtio: move MSIX detection to PCI ethdev Maxime Coquelin
2020-12-30 3:05 ` Xia, Chenbo
2021-01-06 8:22 ` David Marchand
2021-01-14 17:19 ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 08/40] net/virtio: force IOVA as VA mode for Virtio-user Maxime Coquelin
2020-12-30 3:06 ` Xia, Chenbo
2021-01-06 9:06 ` David Marchand
2021-01-06 9:11 ` Thomas Monjalon
2021-01-06 9:22 ` Maxime Coquelin
2021-01-06 16:37 ` Kinsella, Ray
2021-01-06 9:14 ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 09/40] net/virtio: store PCI type in Virtio device metadata Maxime Coquelin
2020-12-30 3:07 ` Xia, Chenbo
2021-01-06 9:14 ` David Marchand
2020-12-20 21:13 ` [dpdk-dev] [PATCH 10/40] net/virtio: add callback for device closing Maxime Coquelin
2020-12-30 3:07 ` Xia, Chenbo
2021-01-06 9:33 ` David Marchand
2020-12-20 21:13 ` [dpdk-dev] [PATCH 11/40] net/virtio: validate features at bus level Maxime Coquelin
2020-12-30 3:08 ` Xia, Chenbo
2021-01-06 9:33 ` David Marchand
2021-01-15 9:20 ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 12/40] net/virtio: remove bus type enum Maxime Coquelin
2020-12-30 3:08 ` Xia, Chenbo
2021-01-06 9:33 ` David Marchand
2020-12-20 21:13 ` [dpdk-dev] [PATCH 13/40] net/virtio: move PCI-specific fields to PCI device Maxime Coquelin
2020-12-30 3:08 ` Xia, Chenbo
2021-01-06 9:58 ` David Marchand
2020-12-20 21:13 ` [dpdk-dev] [PATCH 14/40] net/virtio: pack virtio HW struct Maxime Coquelin
2020-12-30 3:09 ` Xia, Chenbo
2021-01-06 9:58 ` David Marchand
2021-01-15 9:35 ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 15/40] net/virtio: move legacy IO to Virtio PCI Maxime Coquelin
2020-12-30 3:09 ` Xia, Chenbo
2021-01-06 10:09 ` David Marchand
2020-12-20 21:13 ` [dpdk-dev] [PATCH 16/40] net/virtio: introduce generic virtio header Maxime Coquelin
2020-12-30 3:09 ` Xia, Chenbo
2021-01-06 10:08 ` David Marchand
2021-01-15 9:39 ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 17/40] net/virtio: move features definition to generic header Maxime Coquelin
2020-12-30 3:14 ` Xia, Chenbo
2021-01-14 8:40 ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 18/40] net/virtio: move virtqueue defines in " Maxime Coquelin
2020-12-30 3:14 ` Xia, Chenbo
2021-01-06 15:53 ` David Marchand
2021-01-15 10:55 ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 19/40] net/virtio: move config definitions to " Maxime Coquelin
2020-12-30 3:15 ` Xia, Chenbo
2021-01-06 16:01 ` David Marchand
2021-01-15 11:01 ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 20/40] net/virtio: make interrupt handling more generic Maxime Coquelin
2020-12-30 3:17 ` Xia, Chenbo
2021-01-14 8:43 ` Maxime Coquelin
2021-01-06 16:07 ` David Marchand
2020-12-20 21:13 ` [dpdk-dev] [PATCH 21/40] net/virtio: move vring alignment to generic header Maxime Coquelin
2020-12-30 3:18 ` Xia, Chenbo
2021-01-06 16:13 ` David Marchand
2020-12-20 21:13 ` [dpdk-dev] [PATCH 22/40] net/virtio: remove last PCI refs in non-PCI code Maxime Coquelin
2020-12-30 3:25 ` Xia, Chenbo
2021-01-14 8:46 ` Maxime Coquelin
2021-01-06 16:18 ` David Marchand
2021-01-15 11:10 ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 23/40] net/virtio: make Vhost-user req sender consistent Maxime Coquelin
2021-01-06 11:50 ` Xia, Chenbo
2021-01-15 9:47 ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 24/40] net/virtio: add Virtio-user ops to set owner Maxime Coquelin
2021-01-06 11:50 ` Xia, Chenbo
2020-12-20 21:13 ` [dpdk-dev] [PATCH 25/40] net/virtio: add Virtio-user features ops Maxime Coquelin
2021-01-06 11:54 ` Xia, Chenbo
2021-01-13 13:43 ` Adrian Moreno
2021-01-13 13:54 ` Maxime Coquelin
2021-01-15 14:19 ` Maxime Coquelin
2021-01-13 13:57 ` Adrian Moreno
2021-01-15 14:29 ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 26/40] net/virtio: add Virtio-user protocol " Maxime Coquelin
2021-01-06 11:55 ` Xia, Chenbo
2020-12-20 21:13 ` [dpdk-dev] [PATCH 27/40] net/virtio: add Virtio-user memory tables ops Maxime Coquelin
2021-01-06 11:57 ` Xia, Chenbo
2021-01-15 9:57 ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 28/40] net/virtio: add Virtio-user vring setting ops Maxime Coquelin
2021-01-05 21:24 ` David Marchand
2021-01-06 12:01 ` Xia, Chenbo
2021-01-15 10:12 ` Maxime Coquelin
2021-01-06 12:03 ` Xia, Chenbo
2021-01-15 10:15 ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 29/40] net/virtio: add Virtio-user vring file ops Maxime Coquelin
2021-01-05 21:24 ` David Marchand
2021-01-06 12:04 ` Xia, Chenbo
2021-01-15 10:17 ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 30/40] net/virtio: add Virtio-user vring address ops Maxime Coquelin
2021-01-06 12:06 ` Xia, Chenbo
2021-01-15 10:19 ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 31/40] net/virtio: add Virtio-user status ops Maxime Coquelin
2021-01-06 12:09 ` Xia, Chenbo
2021-01-15 10:48 ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 32/40] net/virtio: remove useless request ops Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 33/40] net/virtio: improve Virtio-user errors handling Maxime Coquelin
2021-01-07 2:26 ` Xia, Chenbo
2021-01-15 11:09 ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 34/40] net/virtio: move Vhost-user reqs to Vhost-user backend Maxime Coquelin
2020-12-20 21:14 ` [dpdk-dev] [PATCH 35/40] net/virtio: make server mode blocking Maxime Coquelin
2021-01-07 3:20 ` Xia, Chenbo
2021-01-15 11:13 ` Maxime Coquelin
2020-12-20 21:14 ` [dpdk-dev] [PATCH 36/40] net/virtio: move protocol features to Vhost-user Maxime Coquelin
2020-12-20 21:14 ` [dpdk-dev] [PATCH 37/40] net/virtio: introduce backend data Maxime Coquelin
2021-01-05 21:26 ` David Marchand
2021-01-13 17:18 ` Adrian Moreno [this message]
2021-01-15 16:49 ` Maxime Coquelin
2020-12-20 21:14 ` [dpdk-dev] [PATCH 38/40] net/virtio: move Vhost-user specifics to its backend Maxime Coquelin
2021-01-07 6:32 ` Xia, Chenbo
2021-01-15 12:03 ` Maxime Coquelin
2020-12-20 21:14 ` [dpdk-dev] [PATCH 39/40] net/virtio: move Vhost-kernel data " Maxime Coquelin
2021-01-07 6:42 ` Xia, Chenbo
2021-01-11 8:02 ` Xia, Chenbo
2021-01-15 11:54 ` Maxime Coquelin
2021-01-18 20:36 ` Maxime Coquelin
2020-12-20 21:14 ` [dpdk-dev] [PATCH 40/40] net/virtio: move Vhost-vDPA " Maxime Coquelin
2020-12-22 15:20 ` Maxime Coquelin
2021-01-07 6:50 ` Xia, Chenbo
2021-01-15 12:08 ` Maxime Coquelin
2021-01-11 8:05 ` Xia, Chenbo
2020-12-21 10:58 ` [dpdk-dev] [PATCH 00/40] net/virtio: Virtio PMD rework Maxime Coquelin
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