netdev - [PATCH v1 4/4] vdpa: Support reading device features

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Date:   Thu, 10 Feb 2022 15:31:15 +0200
From:   Eli Cohen <elic@...dia.com>
To:     <stephen@...workplumber.org>, <netdev@...r.kernel.org>
CC:     <jasowang@...hat.com>, <lulu@...hat.com>, <si-wei.liu@...cle.com>,
        "Eli Cohen" <elic@...dia.com>
Subject: [PATCH v1 4/4] vdpa: Support reading device features

When showing the available management devices, check if
VDPA_ATTR_DEV_SUPPORTED_FEATURES feature is available and print the
supported features for a management device.

Example:
$ vdpa mgmtdev show
auxiliary/mlx5_core.sf.1:
  supported_classes net
  max_supported_vqs 257
  dev_features CSUM GUEST_CSUM MTU 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                    | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/vdpa/include/uapi/linux/vdpa.h b/vdpa/include/uapi/linux/vdpa.h
index a3ebf4d4d9b8..96ccbf305d14 100644
--- a/vdpa/include/uapi/linux/vdpa.h
+++ b/vdpa/include/uapi/linux/vdpa.h
@@ -42,6 +42,7 @@ enum vdpa_attr {
 
 	VDPA_ATTR_DEV_NEGOTIATED_FEATURES,	/* u64 */
 	VDPA_ATTR_DEV_MGMTDEV_MAX_VQS,          /* u32 */
+	VDPA_ATTR_DEV_SUPPORTED_FEATURES,	/* u64 */
 
 	/* new attributes must be added above here */
 	VDPA_ATTR_MAX,
diff --git a/vdpa/vdpa.c b/vdpa/vdpa.c
index 99ee828630cc..44b2a3e9e78a 100644
--- a/vdpa/vdpa.c
+++ b/vdpa/vdpa.c
@@ -83,6 +83,7 @@ static const enum mnl_attr_data_type vdpa_policy[VDPA_ATTR_MAX + 1] = {
 	[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,
+	[VDPA_ATTR_DEV_SUPPORTED_FEATURES] = MNL_TYPE_U64,
 };
 
 static int attr_cb(const struct nlattr *attr, void *data)
@@ -535,6 +536,16 @@ static void pr_out_mgmtdev_show(struct vdpa *vdpa, const struct nlmsghdr *nlh,
 		print_uint(PRINT_ANY, "max_supported_vqs", "  max_supported_vqs %d", num_vqs);
 	}
 
+	if (tb[VDPA_ATTR_DEV_SUPPORTED_FEATURES]) {
+		uint64_t features;
+
+		features  = mnl_attr_get_u64(tb[VDPA_ATTR_DEV_SUPPORTED_FEATURES]);
+		if (classes & BIT(VIRTIO_ID_NET))
+			print_net_features(vdpa, features, true);
+		else
+			print_generic_features(vdpa, features, true);
+	}
+
 	pr_out_handle_end(vdpa);
 }
 
-- 
2.34.1