netdev - Re: [PATCH v5 3/4] vdpa: Support for configuring max VQ pairs for a device

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Date:   Wed, 9 Mar 2022 22:00:07 -0700
From:   David Ahern <dsahern@...nel.org>
To:     Eli Cohen <elic@...dia.com>, stephen@...workplumber.org,
        netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        jasowang@...hat.com, si-wei.liu@...cle.com
Cc:     mst@...hat.com, lulu@...hat.com, parav@...dia.com
Subject: Re: [PATCH v5 3/4] vdpa: Support for configuring max VQ pairs for a
 device

On 3/9/22 9:46 AM, Eli Cohen wrote:
> Use VDPA_ATTR_DEV_MGMTDEV_MAX_VQS to specify max number of virtqueue
> pairs to configure for a vdpa device when adding a device.
> 
> Examples:
> 1. Create a device with 3 virtqueue pairs:
> $ vdpa dev add name vdpa-a mgmtdev auxiliary/mlx5_core.sf.1 max_vqp 3
> 
> 2. Read the configuration of a vdpa device
> $ vdpa dev config show vdpa-a
>   vdpa-a: mac 00:00:00:00:88:88 link up link_announce false max_vq_pairs 3 \
>           mtu 1500
>   negotiated_features CSUM GUEST_CSUM MTU MAC HOST_TSO4 HOST_TSO6 STATUS \
>                       CTRL_VQ MQ CTRL_MAC_ADDR VERSION_1 ACCESS_PLATFORM
> 
> Signed-off-by: Eli Cohen <elic@...dia.com>
> ---
> v4 -> v5:
> 1. Use u32 arithmetic in pr_out_mgmtdev_show() to be consistend with
>    attribute width.
> 
>  vdpa/include/uapi/linux/vdpa.h |  1 +
>  vdpa/vdpa.c                    | 27 +++++++++++++++++++++++++--
>  2 files changed, 26 insertions(+), 2 deletions(-)
> 
> diff --git a/vdpa/include/uapi/linux/vdpa.h b/vdpa/include/uapi/linux/vdpa.h
> index 748c350450b2..a3ebf4d4d9b8 100644
> --- a/vdpa/include/uapi/linux/vdpa.h
> +++ b/vdpa/include/uapi/linux/vdpa.h
> @@ -41,6 +41,7 @@ enum vdpa_attr {
>  	VDPA_ATTR_DEV_NET_CFG_MTU,		/* u16 */
>  
>  	VDPA_ATTR_DEV_NEGOTIATED_FEATURES,	/* u64 */
> +	VDPA_ATTR_DEV_MGMTDEV_MAX_VQS,          /* u32 */

rather than add 1 uapi at a time, please sync the uapi file all at once
in a patch before it is needed with a git commit message about where the
uapi file is synched from.

>  
>  	/* new attributes must be added above here */
>  	VDPA_ATTR_MAX,
> diff --git a/vdpa/vdpa.c b/vdpa/vdpa.c
> index 5f1aa91a4b96..8b34e29394b2 100644
> --- a/vdpa/vdpa.c
> +++ b/vdpa/vdpa.c
> @@ -25,6 +25,7 @@
>  #define VDPA_OPT_VDEV_HANDLE		BIT(3)
>  #define VDPA_OPT_VDEV_MAC		BIT(4)
>  #define VDPA_OPT_VDEV_MTU		BIT(5)
> +#define VDPA_OPT_MAX_VQP		BIT(6)
>  
>  struct vdpa_opts {
>  	uint64_t present; /* flags of present items */
> @@ -34,6 +35,7 @@ struct vdpa_opts {
>  	unsigned int device_id;
>  	char mac[ETH_ALEN];
>  	uint16_t mtu;
> +	uint16_t max_vqp;
>  };
>  
>  struct vdpa {
> @@ -81,6 +83,7 @@ static const enum mnl_attr_data_type vdpa_policy[VDPA_ATTR_MAX + 1] = {
>  	[VDPA_ATTR_DEV_MAX_VQS] = MNL_TYPE_U32,
>  	[VDPA_ATTR_DEV_MAX_VQ_SIZE] = MNL_TYPE_U16,
>  	[VDPA_ATTR_DEV_NEGOTIATED_FEATURES] = MNL_TYPE_U64,
> +	[VDPA_ATTR_DEV_MGMTDEV_MAX_VQS] = MNL_TYPE_U32,
>  };
>  
>  static int attr_cb(const struct nlattr *attr, void *data)
> @@ -222,6 +225,8 @@ static void vdpa_opts_put(struct nlmsghdr *nlh, struct vdpa *vdpa)
>  			     sizeof(opts->mac), opts->mac);
>  	if (opts->present & VDPA_OPT_VDEV_MTU)
>  		mnl_attr_put_u16(nlh, VDPA_ATTR_DEV_NET_CFG_MTU, opts->mtu);
> +	if (opts->present & VDPA_OPT_MAX_VQP)
> +		mnl_attr_put_u16(nlh, VDPA_ATTR_DEV_NET_CFG_MAX_VQP, opts->max_vqp);
>  }
>  
>  static int vdpa_argv_parse(struct vdpa *vdpa, int argc, char **argv,
> @@ -290,6 +295,14 @@ static int vdpa_argv_parse(struct vdpa *vdpa, int argc, char **argv,
>  
>  			NEXT_ARG_FWD();
>  			o_found |= VDPA_OPT_VDEV_MTU;
> +		} else if ((matches(*argv, "max_vqp")  == 0) && (o_optional & VDPA_OPT_MAX_VQP)) {
> +			NEXT_ARG_FWD();
> +			err = vdpa_argv_u16(vdpa, argc, argv, &opts->max_vqp);
> +			if (err)
> +				return err;
> +
> +			NEXT_ARG_FWD();
> +			o_found |= VDPA_OPT_MAX_VQP;
>  		} else {
>  			fprintf(stderr, "Unknown option \"%s\"\n", *argv);
>  			return -EINVAL;
> @@ -501,6 +514,15 @@ static void pr_out_mgmtdev_show(struct vdpa *vdpa, const struct nlmsghdr *nlh,
>  		pr_out_array_end(vdpa);
>  	}
>  
> +	if (tb[VDPA_ATTR_DEV_MGMTDEV_MAX_VQS]) {
> +		uint32_t num_vqs;
> +
> +		if (!vdpa->json_output)
> +			printf("\n");
> +		num_vqs = mnl_attr_get_u32(tb[VDPA_ATTR_DEV_MGMTDEV_MAX_VQS]);
> +		print_uint(PRINT_ANY, "max_supported_vqs", "  max_supported_vqs %d", num_vqs);
> +	}
> +
>  	pr_out_handle_end(vdpa);
>  }
>  
> @@ -560,7 +582,7 @@ 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, "       vdpa dev add name NAME mgmtdev MANAGEMENTDEV [ mac MACADDR ] [ mtu MTU ] [max_vqp MAX_VQ_PAIRS]\n");

keep those lines at about 80 chars