netdev - [PATCH v2 1/1] mac802154_hwsim: define perm_extended

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Message-ID: <20250326180909.10406-2-ramonreisfontes@gmail.com>
Date: Wed, 26 Mar 2025 15:09:09 -0300
From: Ramon Fontes <ramonreisfontes@...il.com>
To: davem@...emloft.net,
	kuba@...nel.org,
	pabeni@...hat.com
Cc: linux-wpan@...r.kernel.org,
	alex.aring@...il.com,
	miquel.raynal@...tlin.com,
	netdev@...r.kernel.org,
	Ramon Fontes <ramonreisfontes@...il.com>
Subject: [PATCH v2 1/1] mac802154_hwsim: define perm_extended_addr initialization

This establishes an initialization method for perm_extended_addr,
aligning it with the approach used in mac80211_hwsim.

Signed-off-by: Ramon Fontes <ramonreisfontes@...il.com>
---
 drivers/net/ieee802154/mac802154_hwsim.c | 18 +++++++++++++++++-
 drivers/net/ieee802154/mac802154_hwsim.h |  2 ++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ieee802154/mac802154_hwsim.c b/drivers/net/ieee802154/mac802154_hwsim.c
index 1cab20b5a..400cdac1f 100644
--- a/drivers/net/ieee802154/mac802154_hwsim.c
+++ b/drivers/net/ieee802154/mac802154_hwsim.c
@@ -41,6 +41,17 @@ enum hwsim_multicast_groups {
 	HWSIM_MCGRP_CONFIG,
 };
 
+__le64 addr_to_le64(u8 *addr) {
+    return cpu_to_le64(((u64)addr[0] << 56) |
+                        ((u64)addr[1] << 48) |
+                        ((u64)addr[2] << 40) |
+                        ((u64)addr[3] << 32) |
+                        ((u64)addr[4] << 24) |
+                        ((u64)addr[5] << 16) |
+                        ((u64)addr[6] << 8)  |
+                        ((u64)addr[7]));
+}
+
 static const struct genl_multicast_group hwsim_mcgrps[] = {
 	[HWSIM_MCGRP_CONFIG] = { .name = "config", },
 };
@@ -896,6 +907,7 @@ static int hwsim_subscribe_all_others(struct hwsim_phy *phy)
 static int hwsim_add_one(struct genl_info *info, struct device *dev,
 			 bool init)
 {
+	u8 addr[8];
 	struct ieee802154_hw *hw;
 	struct hwsim_phy *phy;
 	struct hwsim_pib *pib;
@@ -942,7 +954,11 @@ static int hwsim_add_one(struct genl_info *info, struct device *dev,
 	/* 950 MHz GFSK 802.15.4d-2009 */
 	hw->phy->supported.channels[6] |= 0x3ffc00;
 
-	ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
+	memset(addr, 0, sizeof(addr));
+	/* give a specific prefix to the address */
+	addr[0] = 0x02;
+	addr[7] = idx;
+	hw->phy->perm_extended_addr = addr_to_le64(addr);
 
 	/* hwsim phy channel 13 as default */
 	hw->phy->current_channel = 13;
diff --git a/drivers/net/ieee802154/mac802154_hwsim.h b/drivers/net/ieee802154/mac802154_hwsim.h
index 6c6e30e38..536d95eb1 100644
--- a/drivers/net/ieee802154/mac802154_hwsim.h
+++ b/drivers/net/ieee802154/mac802154_hwsim.h
@@ -1,6 +1,8 @@
 #ifndef __MAC802154_HWSIM_H
 #define __MAC802154_HWSIM_H
 
+__le64 addr_to_le64(u8 *addr);
+
 /* mac802154 hwsim netlink commands
  *
  * @MAC802154_HWSIM_CMD_UNSPEC: unspecified command to catch error
-- 
2.43.0