netdev - RE: [PATCH v4 3/4] vdpa: Support for configuring max VQ pairs for a device

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Date:   Wed, 9 Mar 2022 09:03:53 +0000
From:   Eli Cohen <elic@...dia.com>
To:     Parav Pandit <parav@...dia.com>,
        "stephen@...workplumber.org" <stephen@...workplumber.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>
CC:     "jasowang@...hat.com" <jasowang@...hat.com>,
        "mst@...hat.com" <mst@...hat.com>,
        "lulu@...hat.com" <lulu@...hat.com>,
        "si-wei.liu@...cle.com" <si-wei.liu@...cle.com>
Subject: RE: [PATCH v4 3/4] vdpa: Support for configuring max VQ pairs for a
 device



> -----Original Message-----
> From: Parav Pandit <parav@...dia.com>
> Sent: Wednesday, March 9, 2022 10:59 AM
> To: Eli Cohen <elic@...dia.com>; stephen@...workplumber.org;
> netdev@...r.kernel.org; virtualization@...ts.linux-foundation.org
> Cc: jasowang@...hat.com; mst@...hat.com; lulu@...hat.com; si-
> wei.liu@...cle.com
> Subject: RE: [PATCH v4 3/4] vdpa: Support for configuring max VQ pairs for a
> device
> 
> 
> > From: Eli Cohen <elic@...dia.com>
> > Sent: Wednesday, March 2, 2022 12:25 PM
> > --- 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 */
> >
> Its u32 here, but in the code below at places, it is mix of u16 and u32.
> Please make it consistent to be u32 or u16 to match to kernel at all places.
> 
> >  	/* new attributes must be added above here */
> >  	VDPA_ATTR_MAX,
> > diff --git a/vdpa/vdpa.c b/vdpa/vdpa.c index
> > 5f1aa91a4b96..22064c755baa 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;
> >  };
> >
> u16 here.

It should be u32. I will fix and resend.

> 
> >  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,
> >  };
> u32 here, but code is doing u16.
> 
> >
> >  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);
> >  }
> >
> u16 here.
> 
> >  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]) {
> > +		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);
> >  }
> >
> > @@ -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");
> >  	fprintf(stderr, "       vdpa dev del DEV\n");
> >  	fprintf(stderr, "Usage: vdpa dev config COMMAND [ OPTIONS ]\n");  }
> > @@ -650,7 +672,8 @@ 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;
> >
> > --
> > 2.35.1