netdev - [PATCH net-next v6 2/7] bonding: Adding extra_len field to struct bond_opt

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Message-ID: <20250718212430.1968853-3-wilder@us.ibm.com>
Date: Fri, 18 Jul 2025 14:23:38 -0700
From: David Wilder <wilder@...ibm.com>
To: netdev@...r.kernel.org
Cc: jv@...sburgh.net, wilder@...ibm.com, pradeeps@...ux.vnet.ibm.com,
        pradeep@...ibm.com, i.maximets@....org, amorenoz@...hat.com,
        haliu@...hat.com, stephen@...workplumber.org, horms@...nel.org
Subject: [PATCH net-next v6 2/7] bonding: Adding extra_len field to struct bond_opt_value.

Used to record the size of the extra array.

__bond_opt_init() is updated to set extra_len.
BOND_OPT_EXTRA_MAXLEN is increased from 16 to 64.

This is needed for the extended  arp_ip_target option.
The ip command will now pass a variable length value when
setting arp_ip_target.

Signed-off-by: David Wilder <wilder@...ibm.com>
---
 include/net/bond_options.h | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/include/net/bond_options.h b/include/net/bond_options.h
index b7f275bc33a1..b95023bf40c3 100644
--- a/include/net/bond_options.h
+++ b/include/net/bond_options.h
@@ -86,14 +86,15 @@ enum {
  * - if value != ULLONG_MAX -> parse value
  * - if string != NULL -> parse string
  * - if the opt is RAW data and length less than maxlen,
- *   copy the data to extra storage
+ *   copy the data to extra storage, extra_len is set to the size of data copied.
  */
 
-#define BOND_OPT_EXTRA_MAXLEN 16
+#define BOND_OPT_EXTRA_MAXLEN 64
 struct bond_opt_value {
 	char *string;
 	u64 value;
 	u32 flags;
+	u16 extra_len;
 	union {
 		char extra[BOND_OPT_EXTRA_MAXLEN];
 		struct net_device *slave_dev;
@@ -168,8 +169,10 @@ static inline void __bond_opt_init(struct bond_opt_value *optval,
 	else if (string)
 		optval->string = string;
 
-	if (extra && extra_len <= BOND_OPT_EXTRA_MAXLEN)
+	if (extra && extra_len <= BOND_OPT_EXTRA_MAXLEN) {
 		memcpy(optval->extra, extra, extra_len);
+		optval->extra_len = extra_len;
+	}
 }
 #define bond_opt_initval(optval, value) __bond_opt_init(optval, NULL, value, NULL, 0)
 #define bond_opt_initstr(optval, str) __bond_opt_init(optval, str, ULLONG_MAX, NULL, 0)
-- 
2.43.5