netdev - Re: [PATCH v1 3/4] vdpa: Support for configuring max VQ pairs for a device

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Date:   Tue, 15 Feb 2022 16:45:54 +0200
From:   Eli Cohen <elic@...dia.com>
To:     Si-Wei Liu <si-wei.liu@...cle.com>
CC:     <stephen@...workplumber.org>, <netdev@...r.kernel.org>,
        <jasowang@...hat.com>, <lulu@...hat.com>
Subject: Re: [PATCH v1 3/4] vdpa: Support for configuring max VQ pairs for a
 device

On Fri, Feb 11, 2022 at 04:37:02PM -0800, Si-Wei Liu wrote:
> 
> 
> On 2/10/2022 5:31 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>
> > ---
> >   vdpa/include/uapi/linux/vdpa.h |  1 +
> >   vdpa/vdpa.c                    | 25 ++++++++++++++++++++++++-
> >   2 files changed, 25 insertions(+), 1 deletion(-)
> > 
> > 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 */
> >   	/* new attributes must be added above here */
> >   	VDPA_ATTR_MAX,
> > diff --git a/vdpa/vdpa.c b/vdpa/vdpa.c
> > index 7deab710913d..99ee828630cc 100644
> > --- a/vdpa/vdpa.c
> > +++ b/vdpa/vdpa.c
> > @@ -24,6 +24,7 @@
> >   #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 */
> > @@ -33,6 +34,7 @@ struct vdpa_opts {
> >   	unsigned int device_id;
> >   	char mac[ETH_ALEN];
> >   	uint16_t mtu;
> > +	uint16_t max_vqp;
> >   };
> >   struct vdpa {
> > @@ -80,6 +82,7 @@ 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)
> > @@ -221,6 +224,8 @@ 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,
> > @@ -289,6 +294,14 @@ 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;
> It'd be nice to update cmd_dev_help() to include the max_vqp option as well.
> 

Will do.

> Reviewed-by: Si-Wei Liu <si-wei.liu@...cle.com>
> 
> >   		} else {
> >   			fprintf(stderr, "Unknown option \"%s\"\n", *argv);
> >   			return -EINVAL;
> > @@ -513,6 +526,15 @@ 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]) {
> > +		uint16_t num_vqs;
> > +
> > +		if (!vdpa->json_output)
> > +			printf("\n");
> > +		num_vqs = mnl_attr_get_u16(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);
> >   }
> > @@ -662,7 +684,8 @@ static int cmd_dev_add(struct vdpa *vdpa, int argc, char **argv)
> >   					  NLM_F_REQUEST | NLM_F_ACK);
> >   	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_VDEV_MAC | VDPA_OPT_VDEV_MTU |
> > +				  VDPA_OPT_MAX_VQP);
> >   	if (err)
> >   		return err;
>