[PATCH v22 02/20] netlink: add new family to manage ULP_DDP enablement and stats

[Aurelien Aptel <aaptel@nvidia.com>]

Add a new netlink family to get/set ULP DDP capabilities on a network
device and to retrieve statistics.

The messages use the genetlink infrastructure and are specified in a
YAML file which was used to generate some of the files in this commit:

./tools/net/ynl/ynl-gen-c.py --mode kernel \
    --spec ./Documentation/netlink/specs/ulp_ddp.yaml --header \
    -o net/core/ulp_ddp_gen_nl.h
./tools/net/ynl/ynl-gen-c.py --mode kernel \
    --spec ./Documentation/netlink/specs/ulp_ddp.yaml --source \
    -o net/core/ulp_ddp_gen_nl.c
./tools/net/ynl/ynl-gen-c.py --mode uapi \
    --spec ./Documentation/netlink/specs/ulp_ddp.yaml --header \
    > include/uapi/linux/ulp_ddp.h

Signed-off-by: Shai Malin <smalin@nvidia.com>
Signed-off-by: Aurelien Aptel <aaptel@nvidia.com>
---
 Documentation/netlink/specs/ulp_ddp.yaml | 172 ++++++++++++
 include/net/ulp_ddp.h                    |   3 +-
 include/uapi/linux/ulp_ddp.h             |  61 ++++
 net/core/Makefile                        |   2 +-
 net/core/ulp_ddp_gen_nl.c                |  75 +++++
 net/core/ulp_ddp_gen_nl.h                |  30 ++
 net/core/ulp_ddp_nl.c                    | 342 +++++++++++++++++++++++
 7 files changed, 683 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/netlink/specs/ulp_ddp.yaml
 create mode 100644 include/uapi/linux/ulp_ddp.h
 create mode 100644 net/core/ulp_ddp_gen_nl.c
 create mode 100644 net/core/ulp_ddp_gen_nl.h
 create mode 100644 net/core/ulp_ddp_nl.c

diff --git a/Documentation/netlink/specs/ulp_ddp.yaml b/Documentation/netlink/specs/ulp_ddp.yaml
new file mode 100644
index 000000000000..7822aa60ae29
--- /dev/null
+++ b/Documentation/netlink/specs/ulp_ddp.yaml
@@ -0,0 +1,172 @@
+# SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)
+#
+# Author: Aurelien Aptel <aaptel@nvidia.com>
+#
+# Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES.  All rights reserved.
+#
+
+name: ulp_ddp
+
+protocol: genetlink
+
+doc: Netlink protocol to manage ULP DPP on network devices.
+
+definitions:
+  -
+    type: enum
+    name: cap
+    render-max: true
+    entries:
+      - nvme-tcp
+      - nvme-tcp-ddgst-rx
+
+attribute-sets:
+  -
+    name: stats
+    attributes:
+      -
+        name: ifindex
+        doc: interface index of the net device.
+        type: u32
+      -
+        name: rx-nvme-tcp-sk-add
+        doc: Sockets successfully configured for NVMeTCP offloading.
+        type: uint
+      -
+        name: rx-nvme-tcp-sk-add-fail
+        doc: Sockets failed to be configured for NVMeTCP offloading.
+        type: uint
+      -
+        name: rx-nvme-tcp-sk-del
+        doc: Sockets with NVMeTCP offloading configuration removed.
+        type: uint
+      -
+        name: rx-nvme-tcp-setup
+        doc: NVMe-TCP IOs successfully configured for Rx Direct Data Placement.
+        type: uint
+      -
+        name: rx-nvme-tcp-setup-fail
+        doc: NVMe-TCP IOs failed to be configured for Rx Direct Data Placement.
+        type: uint
+      -
+        name: rx-nvme-tcp-teardown
+        doc: NVMe-TCP IOs with Rx Direct Data Placement configuration removed.
+        type: uint
+      -
+        name: rx-nvme-tcp-drop
+        doc: Packets failed the NVMeTCP offload validation.
+        type: uint
+      -
+        name: rx-nvme-tcp-resync
+        doc: >
+          NVMe-TCP resync operations were processed due to Rx TCP packets
+          re-ordering.
+        type: uint
+      -
+        name: rx-nvme-tcp-packets
+        doc: TCP packets successfully processed by the NVMeTCP offload.
+        type: uint
+      -
+        name: rx-nvme-tcp-bytes
+        doc: Bytes were successfully processed by the NVMeTCP offload.
+        type: uint
+  -
+    name: caps
+    attributes:
+      -
+        name: ifindex
+        doc: interface index of the net device.
+        type: u32
+      -
+        name: hw
+        doc: bitmask of the capabilities supported by the device.
+        type: uint
+        enum: cap
+        enum-as-flags: true
+      -
+        name: active
+        doc: bitmask of the capabilities currently enabled on the device.
+        type: uint
+        enum: cap
+        enum-as-flags: true
+      -
+        name: wanted
+        doc: >
+          new active bit values of the capabilities we want to set on the
+          device.
+        type: uint
+        enum: cap
+        enum-as-flags: true
+      -
+        name: wanted_mask
+        doc: bitmask of the meaningful bits in the wanted field.
+        type: uint
+        enum: cap
+        enum-as-flags: true
+
+operations:
+  list:
+    -
+      name: caps-get
+      doc: Get ULP DDP capabilities.
+      attribute-set: caps
+      do:
+        request:
+          attributes:
+            - ifindex
+        reply:
+          attributes:
+            - ifindex
+            - hw
+            - active
+        pre: ulp_ddp_get_netdev
+        post: ulp_ddp_put_netdev
+    -
+      name: stats-get
+      doc: Get ULP DDP stats.
+      attribute-set: stats
+      do:
+        request:
+          attributes:
+            - ifindex
+        reply:
+          attributes:
+            - ifindex
+            - rx-nvme-tcp-sk-add
+            - rx-nvme-tcp-sk-add-fail
+            - rx-nvme-tcp-sk-del
+            - rx-nvme-tcp-setup
+            - rx-nvme-tcp-setup-fail
+            - rx-nvme-tcp-teardown
+            - rx-nvme-tcp-drop
+            - rx-nvme-tcp-resync
+            - rx-nvme-tcp-packets
+            - rx-nvme-tcp-bytes
+        pre: ulp_ddp_get_netdev
+        post: ulp_ddp_put_netdev
+    -
+      name: caps-set
+      doc: Set ULP DDP capabilities.
+      attribute-set: caps
+      do:
+        request:
+          attributes:
+            - ifindex
+            - wanted
+            - wanted_mask
+        reply:
+          attributes:
+            - ifindex
+            - hw
+            - active
+        pre: ulp_ddp_get_netdev
+        post: ulp_ddp_put_netdev
+    -
+      name: caps-set-ntf
+      doc: Notification for change in ULP DDP capabilities.
+      notify: caps-get
+
+mcast-groups:
+  list:
+    -
+      name: mgmt
diff --git a/include/net/ulp_ddp.h b/include/net/ulp_ddp.h
index 5be527332799..ce333e28e089 100644
--- a/include/net/ulp_ddp.h
+++ b/include/net/ulp_ddp.h
@@ -10,6 +10,7 @@
 #include <linux/netdevice.h>
 #include <net/inet_connection_sock.h>
 #include <net/sock.h>
+#include <uapi/linux/ulp_ddp.h>
 
 enum ulp_ddp_type {
 	ULP_DDP_NVME = 1,
@@ -128,7 +129,7 @@ struct ulp_ddp_stats {
 	 */
 };
 
-#define ULP_DDP_CAP_COUNT 1
+#define ULP_DDP_CAP_COUNT (ULP_DDP_CAP_MAX + 1)
 
 struct ulp_ddp_dev_caps {
 	DECLARE_BITMAP(active, ULP_DDP_CAP_COUNT);
diff --git a/include/uapi/linux/ulp_ddp.h b/include/uapi/linux/ulp_ddp.h
new file mode 100644
index 000000000000..dbf6399d3aef
--- /dev/null
+++ b/include/uapi/linux/ulp_ddp.h
@@ -0,0 +1,61 @@
+/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
+/* Do not edit directly, auto-generated from: */
+/*	Documentation/netlink/specs/ulp_ddp.yaml */
+/* YNL-GEN uapi header */
+
+#ifndef _UAPI_LINUX_ULP_DDP_H
+#define _UAPI_LINUX_ULP_DDP_H
+
+#define ULP_DDP_FAMILY_NAME	"ulp_ddp"
+#define ULP_DDP_FAMILY_VERSION	1
+
+enum ulp_ddp_cap {
+	ULP_DDP_CAP_NVME_TCP,
+	ULP_DDP_CAP_NVME_TCP_DDGST_RX,
+
+	/* private: */
+	__ULP_DDP_CAP_MAX,
+	ULP_DDP_CAP_MAX = (__ULP_DDP_CAP_MAX - 1)
+};
+
+enum {
+	ULP_DDP_A_STATS_IFINDEX = 1,
+	ULP_DDP_A_STATS_RX_NVME_TCP_SK_ADD,
+	ULP_DDP_A_STATS_RX_NVME_TCP_SK_ADD_FAIL,
+	ULP_DDP_A_STATS_RX_NVME_TCP_SK_DEL,
+	ULP_DDP_A_STATS_RX_NVME_TCP_SETUP,
+	ULP_DDP_A_STATS_RX_NVME_TCP_SETUP_FAIL,
+	ULP_DDP_A_STATS_RX_NVME_TCP_TEARDOWN,
+	ULP_DDP_A_STATS_RX_NVME_TCP_DROP,
+	ULP_DDP_A_STATS_RX_NVME_TCP_RESYNC,
+	ULP_DDP_A_STATS_RX_NVME_TCP_PACKETS,
+	ULP_DDP_A_STATS_RX_NVME_TCP_BYTES,
+
+	__ULP_DDP_A_STATS_MAX,
+	ULP_DDP_A_STATS_MAX = (__ULP_DDP_A_STATS_MAX - 1)
+};
+
+enum {
+	ULP_DDP_A_CAPS_IFINDEX = 1,
+	ULP_DDP_A_CAPS_HW,
+	ULP_DDP_A_CAPS_ACTIVE,
+	ULP_DDP_A_CAPS_WANTED,
+	ULP_DDP_A_CAPS_WANTED_MASK,
+
+	__ULP_DDP_A_CAPS_MAX,
+	ULP_DDP_A_CAPS_MAX = (__ULP_DDP_A_CAPS_MAX - 1)
+};
+
+enum {
+	ULP_DDP_CMD_CAPS_GET = 1,
+	ULP_DDP_CMD_STATS_GET,
+	ULP_DDP_CMD_CAPS_SET,
+	ULP_DDP_CMD_CAPS_SET_NTF,
+
+	__ULP_DDP_CMD_MAX,
+	ULP_DDP_CMD_MAX = (__ULP_DDP_CMD_MAX - 1)
+};
+
+#define ULP_DDP_MCGRP_MGMT	"mgmt"
+
+#endif /* _UAPI_LINUX_ULP_DDP_H */
diff --git a/net/core/Makefile b/net/core/Makefile
index c135195005f5..da381587a161 100644
--- a/net/core/Makefile
+++ b/net/core/Makefile
@@ -18,7 +18,7 @@ obj-y		     += dev.o dev_addr_lists.o dst.o netevent.o \
 obj-$(CONFIG_NETDEV_ADDR_LIST_TEST) += dev_addr_lists_test.o
 
 obj-y += net-sysfs.o
-obj-$(CONFIG_ULP_DDP) += ulp_ddp.o
+obj-$(CONFIG_ULP_DDP) += ulp_ddp.o ulp_ddp_nl.o ulp_ddp_gen_nl.o
 obj-$(CONFIG_PAGE_POOL) += page_pool.o page_pool_user.o
 obj-$(CONFIG_PROC_FS) += net-procfs.o
 obj-$(CONFIG_NET_PKTGEN) += pktgen.o
diff --git a/net/core/ulp_ddp_gen_nl.c b/net/core/ulp_ddp_gen_nl.c
new file mode 100644
index 000000000000..5675193ad8ca
--- /dev/null
+++ b/net/core/ulp_ddp_gen_nl.c
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)
+/* Do not edit directly, auto-generated from: */
+/*	Documentation/netlink/specs/ulp_ddp.yaml */
+/* YNL-GEN kernel source */
+
+#include <net/netlink.h>
+#include <net/genetlink.h>
+
+#include "ulp_ddp_gen_nl.h"
+
+#include <uapi/linux/ulp_ddp.h>
+
+/* ULP_DDP_CMD_CAPS_GET - do */
+static const struct nla_policy ulp_ddp_caps_get_nl_policy[ULP_DDP_A_CAPS_IFINDEX + 1] = {
+	[ULP_DDP_A_CAPS_IFINDEX] = { .type = NLA_U32, },
+};
+
+/* ULP_DDP_CMD_STATS_GET - do */
+static const struct nla_policy ulp_ddp_stats_get_nl_policy[ULP_DDP_A_STATS_IFINDEX + 1] = {
+	[ULP_DDP_A_STATS_IFINDEX] = { .type = NLA_U32, },
+};
+
+/* ULP_DDP_CMD_CAPS_SET - do */
+static const struct nla_policy ulp_ddp_caps_set_nl_policy[ULP_DDP_A_CAPS_WANTED_MASK + 1] = {
+	[ULP_DDP_A_CAPS_IFINDEX] = { .type = NLA_U32, },
+	[ULP_DDP_A_CAPS_WANTED] = NLA_POLICY_MASK(NLA_UINT, 0x3),
+	[ULP_DDP_A_CAPS_WANTED_MASK] = NLA_POLICY_MASK(NLA_UINT, 0x3),
+};
+
+/* Ops table for ulp_ddp */
+static const struct genl_split_ops ulp_ddp_nl_ops[] = {
+	{
+		.cmd		= ULP_DDP_CMD_CAPS_GET,
+		.pre_doit	= ulp_ddp_get_netdev,
+		.doit		= ulp_ddp_nl_caps_get_doit,
+		.post_doit	= ulp_ddp_put_netdev,
+		.policy		= ulp_ddp_caps_get_nl_policy,
+		.maxattr	= ULP_DDP_A_CAPS_IFINDEX,
+		.flags		= GENL_CMD_CAP_DO,
+	},
+	{
+		.cmd		= ULP_DDP_CMD_STATS_GET,
+		.pre_doit	= ulp_ddp_get_netdev,
+		.doit		= ulp_ddp_nl_stats_get_doit,
+		.post_doit	= ulp_ddp_put_netdev,
+		.policy		= ulp_ddp_stats_get_nl_policy,
+		.maxattr	= ULP_DDP_A_STATS_IFINDEX,
+		.flags		= GENL_CMD_CAP_DO,
+	},
+	{
+		.cmd		= ULP_DDP_CMD_CAPS_SET,
+		.pre_doit	= ulp_ddp_get_netdev,
+		.doit		= ulp_ddp_nl_caps_set_doit,
+		.post_doit	= ulp_ddp_put_netdev,
+		.policy		= ulp_ddp_caps_set_nl_policy,
+		.maxattr	= ULP_DDP_A_CAPS_WANTED_MASK,
+		.flags		= GENL_CMD_CAP_DO,
+	},
+};
+
+static const struct genl_multicast_group ulp_ddp_nl_mcgrps[] = {
+	[ULP_DDP_NLGRP_MGMT] = { "mgmt", },
+};
+
+struct genl_family ulp_ddp_nl_family __ro_after_init = {
+	.name		= ULP_DDP_FAMILY_NAME,
+	.version	= ULP_DDP_FAMILY_VERSION,
+	.netnsok	= true,
+	.parallel_ops	= true,
+	.module		= THIS_MODULE,
+	.split_ops	= ulp_ddp_nl_ops,
+	.n_split_ops	= ARRAY_SIZE(ulp_ddp_nl_ops),
+	.mcgrps		= ulp_ddp_nl_mcgrps,
+	.n_mcgrps	= ARRAY_SIZE(ulp_ddp_nl_mcgrps),
+};
diff --git a/net/core/ulp_ddp_gen_nl.h b/net/core/ulp_ddp_gen_nl.h
new file mode 100644
index 000000000000..368433cfa867
--- /dev/null
+++ b/net/core/ulp_ddp_gen_nl.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
+/* Do not edit directly, auto-generated from: */
+/*	Documentation/netlink/specs/ulp_ddp.yaml */
+/* YNL-GEN kernel header */
+
+#ifndef _LINUX_ULP_DDP_GEN_H
+#define _LINUX_ULP_DDP_GEN_H
+
+#include <net/netlink.h>
+#include <net/genetlink.h>
+
+#include <uapi/linux/ulp_ddp.h>
+
+int ulp_ddp_get_netdev(const struct genl_split_ops *ops, struct sk_buff *skb,
+		       struct genl_info *info);
+void
+ulp_ddp_put_netdev(const struct genl_split_ops *ops, struct sk_buff *skb,
+		   struct genl_info *info);
+
+int ulp_ddp_nl_caps_get_doit(struct sk_buff *skb, struct genl_info *info);
+int ulp_ddp_nl_stats_get_doit(struct sk_buff *skb, struct genl_info *info);
+int ulp_ddp_nl_caps_set_doit(struct sk_buff *skb, struct genl_info *info);
+
+enum {
+	ULP_DDP_NLGRP_MGMT,
+};
+
+extern struct genl_family ulp_ddp_nl_family;
+
+#endif /* _LINUX_ULP_DDP_GEN_H */
diff --git a/net/core/ulp_ddp_nl.c b/net/core/ulp_ddp_nl.c
new file mode 100644
index 000000000000..6f6e603fa2d4
--- /dev/null
+++ b/net/core/ulp_ddp_nl.c
@@ -0,0 +1,342 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ulp_ddp_nl.c
+ *    Author: Aurelien Aptel <aaptel@nvidia.com>
+ *    Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES.  All rights reserved.
+ */
+#include <net/ulp_ddp.h>
+#include "ulp_ddp_gen_nl.h"
+
+#define ULP_DDP_STATS_CNT (sizeof(struct ulp_ddp_stats) / sizeof(u64))
+
+struct ulp_ddp_reply_context {
+	struct net_device *dev;
+	netdevice_tracker tracker;
+	struct ulp_ddp_dev_caps caps;
+	struct ulp_ddp_stats stats;
+};
+
+static size_t ulp_ddp_reply_size(int cmd)
+{
+	size_t len = 0;
+
+	BUILD_BUG_ON(ULP_DDP_CAP_COUNT > 64);
+
+	/* ifindex */
+	len += nla_total_size(sizeof(u32));
+
+	switch (cmd) {
+	case ULP_DDP_CMD_CAPS_GET:
+	case ULP_DDP_CMD_CAPS_SET:
+	case ULP_DDP_CMD_CAPS_SET_NTF:
+		/* hw */
+		len += nla_total_size_64bit(sizeof(u64));
+
+		/* active */
+		len += nla_total_size_64bit(sizeof(u64));
+		break;
+	case ULP_DDP_CMD_STATS_GET:
+		/* stats */
+		len += nla_total_size_64bit(sizeof(u64)) * ULP_DDP_STATS_CNT;
+		break;
+	}
+
+	return len;
+}
+
+/* pre_doit */
+int ulp_ddp_get_netdev(const struct genl_split_ops *ops,
+		       struct sk_buff *skb, struct genl_info *info)
+{
+	struct ulp_ddp_reply_context *ctx;
+	u32 ifindex;
+
+	if (GENL_REQ_ATTR_CHECK(info, ULP_DDP_A_CAPS_IFINDEX))
+		return -EINVAL;
+
+	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ifindex = nla_get_u32(info->attrs[ULP_DDP_A_CAPS_IFINDEX]);
+	ctx->dev = netdev_get_by_index(genl_info_net(info),
+				       ifindex,
+				       &ctx->tracker,
+				       GFP_KERNEL);
+	if (!ctx->dev) {
+		kfree(ctx);
+		NL_SET_ERR_MSG_ATTR(info->extack,
+				    info->attrs[ULP_DDP_A_CAPS_IFINDEX],
+				    "Network interface does not exist");
+		return -ENODEV;
+	}
+
+	if (!ctx->dev->netdev_ops->ulp_ddp_ops) {
+		netdev_put(ctx->dev, &ctx->tracker);
+		kfree(ctx);
+		NL_SET_ERR_MSG_ATTR(info->extack,
+				    info->attrs[ULP_DDP_A_CAPS_IFINDEX],
+				    "Network interface does not support ULP DDP");
+		return -EOPNOTSUPP;
+	}
+
+	info->user_ptr[0] = ctx;
+	return 0;
+}
+
+/* post_doit */
+void ulp_ddp_put_netdev(const struct genl_split_ops *ops, struct sk_buff *skb,
+			struct genl_info *info)
+{
+	struct ulp_ddp_reply_context *ctx = info->user_ptr[0];
+
+	netdev_put(ctx->dev, &ctx->tracker);
+	kfree(ctx);
+}
+
+static int ulp_ddp_prepare_context(struct ulp_ddp_reply_context *ctx, int cmd)
+{
+	const struct ulp_ddp_dev_ops *ops = ctx->dev->netdev_ops->ulp_ddp_ops;
+
+	switch (cmd) {
+	case ULP_DDP_CMD_CAPS_GET:
+	case ULP_DDP_CMD_CAPS_SET:
+	case ULP_DDP_CMD_CAPS_SET_NTF:
+		ops->get_caps(ctx->dev, &ctx->caps);
+		break;
+	case ULP_DDP_CMD_STATS_GET:
+		ops->get_stats(ctx->dev, &ctx->stats);
+		break;
+	}
+
+	return 0;
+}
+
+static int ulp_ddp_write_reply(struct sk_buff *rsp,
+			       struct ulp_ddp_reply_context *ctx,
+			       int cmd,
+			       const struct genl_info *info)
+{
+	void *hdr;
+
+	hdr = genlmsg_iput(rsp, info);
+	if (!hdr)
+		return -EMSGSIZE;
+
+	switch (cmd) {
+	case ULP_DDP_CMD_CAPS_GET:
+	case ULP_DDP_CMD_CAPS_SET:
+	case ULP_DDP_CMD_CAPS_SET_NTF:
+		if (nla_put_u32(rsp, ULP_DDP_A_CAPS_IFINDEX,
+				ctx->dev->ifindex) ||
+		    nla_put_uint(rsp, ULP_DDP_A_CAPS_HW, ctx->caps.hw[0]) ||
+		    nla_put_uint(rsp, ULP_DDP_A_CAPS_ACTIVE,
+				 ctx->caps.active[0]))
+			goto err_cancel_msg;
+		break;
+	case ULP_DDP_CMD_STATS_GET:
+		if (nla_put_u32(rsp, ULP_DDP_A_STATS_IFINDEX,
+				ctx->dev->ifindex) ||
+		    nla_put_uint(rsp,
+				 ULP_DDP_A_STATS_RX_NVME_TCP_SK_ADD,
+				 ctx->stats.rx_nvmeotcp_sk_add) ||
+		    nla_put_uint(rsp,
+				 ULP_DDP_A_STATS_RX_NVME_TCP_SK_ADD_FAIL,
+				 ctx->stats.rx_nvmeotcp_sk_add_fail) ||
+		    nla_put_uint(rsp,
+				 ULP_DDP_A_STATS_RX_NVME_TCP_SK_DEL,
+				 ctx->stats.rx_nvmeotcp_sk_del) ||
+		    nla_put_uint(rsp,
+				 ULP_DDP_A_STATS_RX_NVME_TCP_SETUP,
+				 ctx->stats.rx_nvmeotcp_ddp_setup) ||
+		    nla_put_uint(rsp,
+				 ULP_DDP_A_STATS_RX_NVME_TCP_SETUP_FAIL,
+				 ctx->stats.rx_nvmeotcp_ddp_setup_fail) ||
+		    nla_put_uint(rsp,
+				 ULP_DDP_A_STATS_RX_NVME_TCP_TEARDOWN,
+				 ctx->stats.rx_nvmeotcp_ddp_teardown) ||
+		    nla_put_uint(rsp,
+				 ULP_DDP_A_STATS_RX_NVME_TCP_DROP,
+				 ctx->stats.rx_nvmeotcp_drop) ||
+		    nla_put_uint(rsp,
+				 ULP_DDP_A_STATS_RX_NVME_TCP_RESYNC,
+				 ctx->stats.rx_nvmeotcp_resync) ||
+		    nla_put_uint(rsp,
+				 ULP_DDP_A_STATS_RX_NVME_TCP_PACKETS,
+				 ctx->stats.rx_nvmeotcp_packets) ||
+		    nla_put_uint(rsp,
+				 ULP_DDP_A_STATS_RX_NVME_TCP_BYTES,
+				 ctx->stats.rx_nvmeotcp_bytes))
+			goto err_cancel_msg;
+	}
+	genlmsg_end(rsp, hdr);
+
+	return 0;
+
+err_cancel_msg:
+	genlmsg_cancel(rsp, hdr);
+
+	return -EMSGSIZE;
+}
+
+int ulp_ddp_nl_caps_get_doit(struct sk_buff *req, struct genl_info *info)
+{
+	struct ulp_ddp_reply_context *ctx = info->user_ptr[0];
+	struct sk_buff *rsp;
+	int ret = 0;
+
+	ret = ulp_ddp_prepare_context(ctx, ULP_DDP_CMD_CAPS_GET);
+	if (ret)
+		return ret;
+
+	rsp = genlmsg_new(ulp_ddp_reply_size(ULP_DDP_CMD_CAPS_GET), GFP_KERNEL);
+	if (!rsp)
+		return -EMSGSIZE;
+
+	ret = ulp_ddp_write_reply(rsp, ctx, ULP_DDP_CMD_CAPS_GET, info);
+	if (ret)
+		goto err_rsp;
+
+	return genlmsg_reply(rsp, info);
+
+err_rsp:
+	nlmsg_free(rsp);
+	return ret;
+}
+
+static void ulp_ddp_nl_notify_dev(struct ulp_ddp_reply_context *ctx)
+{
+	struct genl_info info;
+	struct sk_buff *ntf;
+	int ret;
+
+	if (!genl_has_listeners(&ulp_ddp_nl_family, dev_net(ctx->dev),
+				ULP_DDP_NLGRP_MGMT))
+		return;
+
+	genl_info_init_ntf(&info, &ulp_ddp_nl_family, ULP_DDP_CMD_CAPS_SET_NTF);
+	ntf = genlmsg_new(ulp_ddp_reply_size(ULP_DDP_CMD_CAPS_SET_NTF), GFP_KERNEL);
+	if (!ntf)
+		return;
+
+	ret = ulp_ddp_write_reply(ntf, ctx, ULP_DDP_CMD_CAPS_SET_NTF, &info);
+	if (ret) {
+		nlmsg_free(ntf);
+		return;
+	}
+
+	genlmsg_multicast_netns(&ulp_ddp_nl_family, dev_net(ctx->dev), ntf,
+				0, ULP_DDP_NLGRP_MGMT, GFP_KERNEL);
+}
+
+static int ulp_ddp_apply_bits(struct ulp_ddp_reply_context *ctx,
+			      unsigned long *req_wanted,
+			      unsigned long *req_mask,
+			      struct genl_info *info,
+			      bool *notify)
+{
+	DECLARE_BITMAP(old_active, ULP_DDP_CAP_COUNT);
+	DECLARE_BITMAP(new_active, ULP_DDP_CAP_COUNT);
+	const struct ulp_ddp_dev_ops *ops;
+	struct ulp_ddp_dev_caps caps;
+	int ret;
+
+	ops = ctx->dev->netdev_ops->ulp_ddp_ops;
+	ops->get_caps(ctx->dev, &caps);
+
+	/* new_active = (old_active & ~req_mask) | (wanted & req_mask)
+	 * new_active &= caps_hw
+	 */
+	bitmap_copy(old_active, caps.active, ULP_DDP_CAP_COUNT);
+	bitmap_and(req_wanted, req_wanted, req_mask, ULP_DDP_CAP_COUNT);
+	bitmap_andnot(new_active, old_active, req_mask, ULP_DDP_CAP_COUNT);
+	bitmap_or(new_active, new_active, req_wanted, ULP_DDP_CAP_COUNT);
+	bitmap_and(new_active, new_active, caps.hw, ULP_DDP_CAP_COUNT);
+	if (!bitmap_equal(old_active, new_active, ULP_DDP_CAP_COUNT)) {
+		ret = ops->set_caps(ctx->dev, new_active, info->extack);
+		if (ret)
+			return ret;
+		ops->get_caps(ctx->dev, &caps);
+		bitmap_copy(new_active, caps.active, ULP_DDP_CAP_COUNT);
+	}
+
+	/* notify if capabilities were changed */
+	*notify = !bitmap_equal(old_active, new_active, ULP_DDP_CAP_COUNT);
+
+	return 0;
+}
+
+int ulp_ddp_nl_caps_set_doit(struct sk_buff *skb, struct genl_info *info)
+{
+	struct ulp_ddp_reply_context *ctx = info->user_ptr[0];
+	unsigned long wanted, wanted_mask;
+	struct sk_buff *rsp;
+	bool notify = false;
+	int ret;
+
+	if (GENL_REQ_ATTR_CHECK(info, ULP_DDP_A_CAPS_WANTED) ||
+	    GENL_REQ_ATTR_CHECK(info, ULP_DDP_A_CAPS_WANTED_MASK))
+		return -EINVAL;
+
+	rsp = genlmsg_new(ulp_ddp_reply_size(ULP_DDP_CMD_CAPS_SET), GFP_KERNEL);
+	if (!rsp)
+		return -EMSGSIZE;
+
+	wanted = nla_get_uint(info->attrs[ULP_DDP_A_CAPS_WANTED]);
+	wanted_mask = nla_get_uint(info->attrs[ULP_DDP_A_CAPS_WANTED_MASK]);
+
+	ret = ulp_ddp_apply_bits(ctx, &wanted, &wanted_mask, info, &notify);
+	if (ret)
+		goto err_rsp;
+
+	ret = ulp_ddp_prepare_context(ctx, ULP_DDP_CMD_CAPS_SET);
+	if (ret)
+		goto err_rsp;
+
+	ret = ulp_ddp_write_reply(rsp, ctx, ULP_DDP_CMD_CAPS_SET, info);
+	if (ret)
+		goto err_rsp;
+
+	ret = genlmsg_reply(rsp, info);
+	if (notify)
+		ulp_ddp_nl_notify_dev(ctx);
+
+	return ret;
+
+err_rsp:
+	nlmsg_free(rsp);
+
+	return ret;
+}
+
+int ulp_ddp_nl_stats_get_doit(struct sk_buff *skb, struct genl_info *info)
+{
+	struct ulp_ddp_reply_context *ctx = info->user_ptr[0];
+	struct sk_buff *rsp;
+	int ret = 0;
+
+	ret = ulp_ddp_prepare_context(ctx, ULP_DDP_CMD_STATS_GET);
+	if (ret)
+		return ret;
+
+	rsp = genlmsg_new(ulp_ddp_reply_size(ULP_DDP_CMD_STATS_GET), GFP_KERNEL);
+	if (!rsp)
+		return -EMSGSIZE;
+
+	ret = ulp_ddp_write_reply(rsp, ctx, ULP_DDP_CMD_STATS_GET, info);
+	if (ret)
+		goto err_rsp;
+
+	return genlmsg_reply(rsp, info);
+
+err_rsp:
+	nlmsg_free(rsp);
+	return ret;
+}
+
+static int __init ulp_ddp_init(void)
+{
+	return genl_register_family(&ulp_ddp_nl_family);
+}
+
+subsys_initcall(ulp_ddp_init);
-- 
2.34.1