From: Aya Levin <ayal@mellanox.com>
Date: Tue, 12 Nov 2019 14:07:49 +0200
Subject: devlink: Allow large formatted message of binary output
Patch-mainline: v5.5-rc1
Git-commit: e2cde864a1d3e3626bfc8fa088fbc82b04ce66ed
References: bsc#1154353

Devlink supports pair output of name and value. When the value is
binary, it must be presented in an array. If the length of the binary
value exceeds fmsg limitation, break the value into chunks internally.

Signed-off-by: Aya Levin <ayal@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 include/net/devlink.h |    4 +---
 net/core/devlink.c    |   24 +++++++++++++++---------
 2 files changed, 16 insertions(+), 12 deletions(-)

--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -967,8 +967,6 @@ int devlink_fmsg_u8_put(struct devlink_f
 int devlink_fmsg_u32_put(struct devlink_fmsg *fmsg, u32 value);
 int devlink_fmsg_u64_put(struct devlink_fmsg *fmsg, u64 value);
 int devlink_fmsg_string_put(struct devlink_fmsg *fmsg, const char *value);
-int devlink_fmsg_binary_put(struct devlink_fmsg *fmsg, const void *value,
-			    u16 value_len);
 
 int devlink_fmsg_bool_pair_put(struct devlink_fmsg *fmsg, const char *name,
 			       bool value);
@@ -981,7 +979,7 @@ int devlink_fmsg_u64_pair_put(struct dev
 int devlink_fmsg_string_pair_put(struct devlink_fmsg *fmsg, const char *name,
 				 const char *value);
 int devlink_fmsg_binary_pair_put(struct devlink_fmsg *fmsg, const char *name,
-				 const void *value, u16 value_len);
+				 const void *value, u32 value_len);
 
 struct devlink_health_reporter *
 devlink_health_reporter_create(struct devlink *devlink,
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -4414,12 +4414,11 @@ int devlink_fmsg_string_put(struct devli
 }
 EXPORT_SYMBOL_GPL(devlink_fmsg_string_put);
 
-int devlink_fmsg_binary_put(struct devlink_fmsg *fmsg, const void *value,
-			    u16 value_len)
+static int devlink_fmsg_binary_put(struct devlink_fmsg *fmsg, const void *value,
+				   u16 value_len)
 {
 	return devlink_fmsg_put_value(fmsg, value, value_len, NLA_BINARY);
 }
-EXPORT_SYMBOL_GPL(devlink_fmsg_binary_put);
 
 int devlink_fmsg_bool_pair_put(struct devlink_fmsg *fmsg, const char *name,
 			       bool value)
@@ -4527,19 +4526,26 @@ int devlink_fmsg_string_pair_put(struct
 EXPORT_SYMBOL_GPL(devlink_fmsg_string_pair_put);
 
 int devlink_fmsg_binary_pair_put(struct devlink_fmsg *fmsg, const char *name,
-				 const void *value, u16 value_len)
+				 const void *value, u32 value_len)
 {
+	u32 data_size;
+	u32 offset;
 	int err;
 
-	err = devlink_fmsg_pair_nest_start(fmsg, name);
+	err = devlink_fmsg_arr_pair_nest_start(fmsg, name);
 	if (err)
 		return err;
 
-	err = devlink_fmsg_binary_put(fmsg, value, value_len);
-	if (err)
-		return err;
+	for (offset = 0; offset < value_len; offset += data_size) {
+		data_size = value_len - offset;
+		if (data_size > DEVLINK_FMSG_MAX_SIZE)
+			data_size = DEVLINK_FMSG_MAX_SIZE;
+		err = devlink_fmsg_binary_put(fmsg, value + offset, data_size);
+		if (err)
+			return err;
+	}
 
-	err = devlink_fmsg_pair_nest_end(fmsg);
+	err = devlink_fmsg_arr_pair_nest_end(fmsg);
 	if (err)
 		return err;