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Date: Tue, 22 Nov 2022 18:08:48 +0100
From: Eugenio Perez Martin <eperezma@...hat.com>
To: Jason Wang <jasowang@...hat.com>
Cc: dsahern@...nel.org, netdev@...r.kernel.org,
virtualization@...ts.linux-foundation.org, si-wei.liu@...cle.com,
mst@...hat.com, lingshan.zhu@...el.com, elic@...dia.com
Subject: Re: [PATCH V2] vdpa: allow provisioning device features
On Thu, Nov 17, 2022 at 4:33 AM Jason Wang <jasowang@...hat.com> wrote:
>
> This patch allows device features to be provisioned via vdpa. This
> will be useful for preserving migration compatibility between source
> and destination:
>
> # vdpa dev add name dev1 mgmtdev pci/0000:02:00.0 device_features 0x300020000
> # dev1: mac 52:54:00:12:34:56 link up link_announce false mtu 65535
> negotiated_features CTRL_VQ VERSION_1 ACCESS_PLATFORM
>
> Signed-off-by: Jason Wang <jasowang@...hat.com>
Acked-by: Eugenio Pérez <eperezma@...hat.com>
> ---
> Changes since v1:
> - Use uint64_t instead of __u64 for device_features
> - Fix typos and tweak the manpage
> - Add device_features to the help text
> ---
> man/man8/vdpa-dev.8 | 15 +++++++++++++++
> vdpa/include/uapi/linux/vdpa.h | 1 +
> vdpa/vdpa.c | 32 +++++++++++++++++++++++++++++---
> 3 files changed, 45 insertions(+), 3 deletions(-)
>
> diff --git a/man/man8/vdpa-dev.8 b/man/man8/vdpa-dev.8
> index 9faf3838..43e5bf48 100644
> --- a/man/man8/vdpa-dev.8
> +++ b/man/man8/vdpa-dev.8
> @@ -31,6 +31,7 @@ vdpa-dev \- vdpa device configuration
> .I NAME
> .B mgmtdev
> .I MGMTDEV
> +.RI "[ device_features " DEVICE_FEATURES " ]"
> .RI "[ mac " MACADDR " ]"
> .RI "[ mtu " MTU " ]"
> .RI "[ max_vqp " MAX_VQ_PAIRS " ]"
> @@ -74,6 +75,15 @@ Name of the new vdpa device to add.
> Name of the management device to use for device addition.
>
> .PP
> +.BI device_features " DEVICE_FEATURES"
> +Specifies the virtio device features bit-mask that is provisioned for the new vdpa device.
> +
> +The bits can be found under include/uapi/linux/virtio*h.
> +
> +see macros such as VIRTIO_F_ and VIRTIO_XXX(e.g NET)_F_ for specific bit values.
> +
> +This is optional.
> +
> .BI mac " MACADDR"
> - specifies the mac address for the new vdpa device.
> This is applicable only for the network type of vdpa device. This is optional.
> @@ -127,6 +137,11 @@ vdpa dev add name foo mgmtdev vdpa_sim_net
> Add the vdpa device named foo on the management device vdpa_sim_net.
> .RE
> .PP
> +vdpa dev add name foo mgmtdev vdpa_sim_net device_features 0x300020000
> +.RS 4
> +Add the vdpa device named foo on the management device vdpa_sim_net with device_features of 0x300020000
> +.RE
> +.PP
> vdpa dev add name foo mgmtdev vdpa_sim_net mac 00:11:22:33:44:55
> .RS 4
> Add the vdpa device named foo on the management device vdpa_sim_net with mac address of 00:11:22:33:44:55.
> diff --git a/vdpa/include/uapi/linux/vdpa.h b/vdpa/include/uapi/linux/vdpa.h
> index 94e4dad1..7c961991 100644
> --- a/vdpa/include/uapi/linux/vdpa.h
> +++ b/vdpa/include/uapi/linux/vdpa.h
> @@ -51,6 +51,7 @@ enum vdpa_attr {
> VDPA_ATTR_DEV_QUEUE_INDEX, /* u32 */
> VDPA_ATTR_DEV_VENDOR_ATTR_NAME, /* string */
> VDPA_ATTR_DEV_VENDOR_ATTR_VALUE, /* u64 */
> + VDPA_ATTR_DEV_FEATURES, /* u64 */
>
> /* new attributes must be added above here */
> VDPA_ATTR_MAX,
> diff --git a/vdpa/vdpa.c b/vdpa/vdpa.c
> index b73e40b4..d0ce5e22 100644
> --- a/vdpa/vdpa.c
> +++ b/vdpa/vdpa.c
> @@ -27,6 +27,7 @@
> #define VDPA_OPT_VDEV_MTU BIT(5)
> #define VDPA_OPT_MAX_VQP BIT(6)
> #define VDPA_OPT_QUEUE_INDEX BIT(7)
> +#define VDPA_OPT_VDEV_FEATURES BIT(8)
>
> struct vdpa_opts {
> uint64_t present; /* flags of present items */
> @@ -38,6 +39,7 @@ struct vdpa_opts {
> uint16_t mtu;
> uint16_t max_vqp;
> uint32_t queue_idx;
> + uint64_t device_features;
> };
>
> struct vdpa {
> @@ -187,6 +189,17 @@ static int vdpa_argv_u32(struct vdpa *vdpa, int argc, char **argv,
> return get_u32(result, *argv, 10);
> }
>
> +static int vdpa_argv_u64_hex(struct vdpa *vdpa, int argc, char **argv,
> + uint64_t *result)
> +{
> + if (argc <= 0 || !*argv) {
> + fprintf(stderr, "number expected\n");
> + return -EINVAL;
> + }
> +
> + return get_u64(result, *argv, 16);
> +}
> +
> struct vdpa_args_metadata {
> uint64_t o_flag;
> const char *err_msg;
> @@ -244,6 +257,10 @@ static void vdpa_opts_put(struct nlmsghdr *nlh, struct vdpa *vdpa)
> mnl_attr_put_u16(nlh, VDPA_ATTR_DEV_NET_CFG_MAX_VQP, opts->max_vqp);
> if (opts->present & VDPA_OPT_QUEUE_INDEX)
> mnl_attr_put_u32(nlh, VDPA_ATTR_DEV_QUEUE_INDEX, opts->queue_idx);
> + if (opts->present & VDPA_OPT_VDEV_FEATURES) {
> + mnl_attr_put_u64(nlh, VDPA_ATTR_DEV_FEATURES,
> + opts->device_features);
> + }
> }
>
> static int vdpa_argv_parse(struct vdpa *vdpa, int argc, char **argv,
> @@ -329,6 +346,14 @@ static int vdpa_argv_parse(struct vdpa *vdpa, int argc, char **argv,
>
> NEXT_ARG_FWD();
> o_found |= VDPA_OPT_QUEUE_INDEX;
> + } else if (!strcmp(*argv, "device_features") &&
> + (o_optional & VDPA_OPT_VDEV_FEATURES)) {
> + NEXT_ARG_FWD();
> + err = vdpa_argv_u64_hex(vdpa, argc, argv,
> + &opts->device_features);
> + if (err)
> + return err;
> + o_found |= VDPA_OPT_VDEV_FEATURES;
> } else {
> fprintf(stderr, "Unknown option \"%s\"\n", *argv);
> return -EINVAL;
> @@ -615,8 +640,9 @@ static int cmd_mgmtdev(struct vdpa *vdpa, int argc, char **argv)
> static void cmd_dev_help(void)
> {
> fprintf(stderr, "Usage: vdpa dev show [ DEV ]\n");
> - fprintf(stderr, " vdpa dev add name NAME mgmtdev MANAGEMENTDEV [ mac MACADDR ] [ mtu MTU ]\n");
> - fprintf(stderr, " [ max_vqp MAX_VQ_PAIRS ]\n");
> + fprintf(stderr, " vdpa dev add name NAME mgmtdevMANAGEMENTDEV [ device_features DEVICE_FEATURES]\n");
> + fprintf(stderr, " [ mac MACADDR ] [ mtu MTU ]\n");
> + fprintf(stderr, " [ max_vqp MAX_VQ_PAIRS ]\n");
> fprintf(stderr, " vdpa dev del DEV\n");
> fprintf(stderr, "Usage: vdpa dev config COMMAND [ OPTIONS ]\n");
> fprintf(stderr, "Usage: vdpa dev vstats COMMAND\n");
> @@ -708,7 +734,7 @@ static int cmd_dev_add(struct vdpa *vdpa, int argc, char **argv)
> err = vdpa_argv_parse_put(nlh, vdpa, argc, argv,
> VDPA_OPT_VDEV_MGMTDEV_HANDLE | VDPA_OPT_VDEV_NAME,
> VDPA_OPT_VDEV_MAC | VDPA_OPT_VDEV_MTU |
> - VDPA_OPT_MAX_VQP);
> + VDPA_OPT_MAX_VQP | VDPA_OPT_VDEV_FEATURES);
> if (err)
> return err;
>
> --
> 2.25.1
>
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