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Date: Thu, 10 Mar 2022 05:59:39 +0000
From: Eli Cohen <elic@...dia.com>
To: David Ahern <dsahern@...nel.org>,
"stephen@...workplumber.org" <stephen@...workplumber.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"virtualization@...ts.linux-foundation.org"
<virtualization@...ts.linux-foundation.org>,
"jasowang@...hat.com" <jasowang@...hat.com>,
"si-wei.liu@...cle.com" <si-wei.liu@...cle.com>
CC: "mst@...hat.com" <mst@...hat.com>,
"lulu@...hat.com" <lulu@...hat.com>,
Parav Pandit <parav@...dia.com>
Subject: RE: [PATCH v5 3/4] vdpa: Support for configuring max VQ pairs for a
device
> -----Original Message-----
> From: David Ahern <dsahern@...nel.org>
> Sent: Thursday, March 10, 2022 7:00 AM
> 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 Pandit <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
Break the string into two lines?
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