Re: [PATCH v3 net-next 2/4] sock: ULP infrastructure

diff --git a/include/net/ulp_sock.h b/include/net/ulp_sock.h
new file mode 100644
index 000000000000..37bf4d2e16b9
--- /dev/null
+++ b/include/net/ulp_sock.h

@@ -0,0 +1,75 @@
+/*
+ * Pluggable upper layer protocol support in sockets.
+ *
+ * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved.
+ * Copyright (c) 2017, Tom Herbert <tom@quantonium.net>. All rights reserved.
+ *
+ */
+
+#ifndef __NET_ULP_SOCK_H
+#define __NET_ULP_SOCK_H
+
+#include <linux/socket.h>
+
+#define ULP_MAX             128
+#define ULP_BUF_MAX         (ULP_NAME_MAX * ULP_MAX)
+
+struct ulp_ops {
+	struct list_head list;
+
+	/* initialize ulp */
+	int (*init)(struct sock *sk, char __user *optval, int len);
+
+	/* cleanup ulp */
+	void (*release)(struct sock *sk);
+
+	/* Get ULP specific parameters in getsockopt */
+	int (*get_params)(struct sock *sk, char __user *optval, int *optlen);
+
+	char name[ULP_NAME_MAX];
+	struct module *owner;
+};
+
+#ifdef CONFIG_ULP_SOCK
+
+int ulp_register(struct ulp_ops *type);
+void ulp_unregister(struct ulp_ops *type);
+int ulp_set(struct sock *sk, char __user *optval, int len);
+int ulp_get_config(struct sock *sk, char __user *optval, int *optlen);
+void ulp_get_available(char *buf, size_t len);
+void ulp_cleanup(struct sock *sk);
+
+#else
+
+static inline int ulp_register(struct ulp_ops *type)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline void ulp_unregister(struct ulp_ops *type)
+{
+}
+
+static inline int ulp_set(struct sock *sk, char __user *optval, int len)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int ulp_get_config(struct sock *sk, char __user *optval,
+				 int *optlen)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline void ulp_get_available(char *buf, size_t len)
+{

+}
+
+static inline void ulp_cleanup(struct sock *sk)
+{
+}
+
+#endif
+
+#endif /* __NET_ULP_SOCK_H */

diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index b7cd9aafe99e..9e14f91b57eb 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c

@@ -21,6 +21,7 @@

#include <net/net_ratelimit.h>
#include <net/busy_poll.h>
#include <net/pkt_sched.h>
+#include <net/ulp_sock.h>

static int zero = 0;
static int one = 1;

@@ -249,6 +250,24 @@ static int proc_do_rss_key(struct ctl_table *table, int write,

	return proc_dostring(&fake_table, write, buffer, lenp, ppos);
}

+static int proc_ulp_available(struct ctl_table *ctl,
+			      int write,
+			      void __user *buffer, size_t *lenp,
+			      loff_t *ppos)
+{
+	struct ctl_table tbl = { .maxlen = ULP_BUF_MAX, };
+	int ret;
+
+	tbl.data = kmalloc(tbl.maxlen, GFP_USER);

+	if (!tbl.data)
+		return -ENOMEM;
+	ulp_get_available(tbl.data, ULP_BUF_MAX);
+	ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
+	kfree(tbl.data);
+
+	return ret;
+}
+
static struct ctl_table net_core_table[] = {
#ifdef CONFIG_NET
	{

@@ -460,6 +479,12 @@ static struct ctl_table net_core_table[] = {

		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &zero,
	},
+	{
+		.procname	= "ulp_available",
+		.maxlen		= ULP_BUF_MAX,
+		.mode		= 0444,
+		.proc_handler	= proc_ulp_available,
+	},
	{ }
};