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Date: Wed, 6 Apr 2022 20:56:41 +0000
From: Parav Pandit <parav@...dia.com>
To: Michael Qiu <qiudayu@...heros.com>,
"stephen@...workplumber.org" <stephen@...workplumber.org>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH iproute2 v2] vdpa: Add virtqueue pairs set capacity
Hi Michael,
> From: Michael Qiu <qiudayu@...heros.com>
> Sent: Wednesday, April 6, 2022 5:37 AM
> To: Parav Pandit <parav@...dia.com>; stephen@...workplumber.org
> Cc: netdev@...r.kernel.org; Michael Qiu <qiudayu@...heros.com>
> Subject: [PATCH iproute2 v2] vdpa: Add virtqueue pairs set capacity
>
> vdpa framework not only support query the max virtqueue pair, but also for
> the set action.
>
> This patch enable this capacity, and it is very useful for VMs who needs
> multiqueue support.
>
> After enable this feature, we could simply use below command to create
> multi-queue support:
>
> vdpa dev add mgmtdev pci/0000:03:10.3 name foo mac 56:d0:2f:03:c9:6d
> max_vqp 6
>
> Signed-off-by: Michael Qiu <qiudayu@...heros.com>
> ---
>
> v2 --> v1:
> rename "max_vq_pairs" to "max_vqp"
>
> extend the man page for this addition with example
> ---
> man/man8/vdpa-dev.8 | 9 +++++++++
> vdpa/vdpa.c | 19 ++++++++++++++++---
> 2 files changed, 25 insertions(+), 3 deletions(-)
>
> diff --git a/man/man8/vdpa-dev.8 b/man/man8/vdpa-dev.8 index
> aa21ae3..a401115 100644
> --- a/man/man8/vdpa-dev.8
> +++ b/man/man8/vdpa-dev.8
> @@ -74,6 +74,10 @@ This is applicable only for the network type of vdpa
> device. This is optional.
> - specifies the mtu for the new vdpa device.
> This is applicable only for the network type of vdpa device. This is optional.
>
> +.BI max_vqp " MAX_VQP"
> +- specifies the max queue pairs for the new vdpa device.
> +This is applicable only for the network type of vdpa device. This is optional.
> +
> .SS vdpa dev del - Delete the vdpa device.
>
> .PP
> @@ -119,6 +123,11 @@ vdpa dev add name foo mgmtdev vdpa_sim_net
> mac 00:11:22:33:44:55 mtu 9000 Add the vdpa device named foo on the
> management device vdpa_sim_net with mac address of 00:11:22:33:44:55
> and mtu of 9000 bytes.
> .RE
> .PP
> +vdpa dev add name foo mgmtdev vdpa_sim_net mac 00:11:22:33:44:55 mtu
> +9000 max_vqp 6 .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, mtu of 9000
> bytes and max virtqueue pairs of 6.
> +.RE
> +.PP
> vdpa dev del foo
> .RS 4
> Delete the vdpa device named foo which was previously created.
> diff --git a/vdpa/vdpa.c b/vdpa/vdpa.c
> index f048e47..104c503 100644
> --- a/vdpa/vdpa.c
> +++ b/vdpa/vdpa.c
> @@ -23,6 +23,7 @@
> #define VDPA_OPT_VDEV_HANDLE BIT(3)
> #define VDPA_OPT_VDEV_MAC BIT(4)
> #define VDPA_OPT_VDEV_MTU BIT(5)
> +#define VDPA_OPT_VDEV_QUEUE_PAIRS BIT(6)
>
> struct vdpa_opts {
> uint64_t present; /* flags of present items */ @@ -32,6 +33,7 @@
> struct vdpa_opts {
> unsigned int device_id;
> char mac[ETH_ALEN];
> uint16_t mtu;
> + uint16_t max_vqp;
> };
>
> struct vdpa {
> @@ -219,6 +221,8 @@ 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_VDEV_QUEUE_PAIRS)
> + 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, @@ -
> 287,6 +291,15 @@ static int vdpa_argv_parse(struct vdpa *vdpa, int argc,
> char **argv,
>
> NEXT_ARG_FWD();
> o_found |= VDPA_OPT_VDEV_MTU;
> + } else if ((strcmp(*argv, "max_vqp") == 0) &&
> + (o_all & VDPA_OPT_VDEV_QUEUE_PAIRS)) {
> + NEXT_ARG_FWD();
> + err = vdpa_argv_u16(vdpa, argc, argv, &opts-
> >max_vqp);
> + if (err)
> + return err;
> +
> + NEXT_ARG_FWD();
> + o_found |= VDPA_OPT_VDEV_QUEUE_PAIRS;
> } else {
> fprintf(stderr, "Unknown option \"%s\"\n", *argv);
> return -EINVAL;
> @@ -467,7 +480,7 @@ 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 N ]\n");
> fprintf(stderr, " vdpa dev del DEV\n");
> fprintf(stderr, "Usage: vdpa dev config COMMAND [ OPTIONS ]\n");
> } @@ -557,7 +570,7 @@ 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_VDEV_QUEUE_PAIRS);
> if (err)
> return err;
>
> @@ -603,7 +616,7 @@ static void pr_out_dev_net_config(struct nlattr **tb)
> }
> if (tb[VDPA_ATTR_DEV_NET_CFG_MAX_VQP]) {
> val_u16 =
> mnl_attr_get_u16(tb[VDPA_ATTR_DEV_NET_CFG_MAX_VQP]);
> - print_uint(PRINT_ANY, "max_vq_pairs", "max_vq_pairs %d
> ",
> + print_uint(PRINT_ANY, "max_vqp", "max_vqp %d ",
> val_u16);
> }
> if (tb[VDPA_ATTR_DEV_NET_CFG_MTU]) {
> --
> 1.8.3.1
>
You are probably not using right iproute2 tree.
I already see existing code from Eli in commit [1] that supports setting this field.
The iproute2 tree to use for upstream work is [2].
[1] commit 16482fd4d ("vdpa: Support for configuring max VQ pairs for a device")
[2] git://git.kernel.org/pub/scm/network/iproute2/iproute2.git
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