netconsole: move remote_mac from struct netpoll to netconsole_target

The destination ethernet address is netconsole configuration: no other
netpoll user (bonding, team, vlan, bridge, macvlan, dsa) references
np->remote_mac, only netconsole's ethernet framing and its
configfs/cmdline interface do.

Move it into struct netconsole_target and convert push_eth() to take the
netconsole_target; netconsole_print_banner() and
netconsole_parser_cmdline() already take it. The configfs show/store
handlers and alloc_and_init() reach the field directly.

No functional change; the remote_mac sysfs attribute is unchanged.

Signed-off-by: Breno Leitao <leitao@debian.org>
Link: https://patch.msgid.link/20260710-netconsole_move_more-v3-9-6f63f76b28bc@debian.org
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

2 files changed, 11 insertions, 10 deletions

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index d0739b45f66e..49b2243a20b2 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -178,9 +178,9 @@ enum target_state {
  *		local_ip	(read-write)
  *		remote_ip	(read-write)
  *		local_mac	(read-only)
- *		remote_mac	(read-write)
  * @local_port:	Source UDP port of the target (read-write).
  * @remote_port: Destination UDP port of the target (read-write).
+ * @remote_mac:	Destination ethernet address of the target (read-write).
  * @buf:	The buffer used to send the full msg to the network stack
  * @resume_wq:	Workqueue to resume deactivated target
  * @skb_pool:	Per-target fallback skb pool consulted by find_skb() when
@@ -209,6 +209,7 @@ struct netconsole_target {
 	bool			release;
 	struct netpoll		np;
 	u16			local_port, remote_port;
+	u8			remote_mac[ETH_ALEN];
 	/* protected by target_list_lock; +1 gives scnprintf() room for its
 	 * NUL terminator so a full MAX_PRINT_CHUNK payload is not truncated
 	 */
@@ -462,7 +463,7 @@ static struct netconsole_target *alloc_and_init(void)
 	strscpy(nt->np.dev_name, "eth0", IFNAMSIZ);
 	nt->local_port = 6665;
 	nt->remote_port = 6666;
-	eth_broadcast_addr(nt->np.remote_mac);
+	eth_broadcast_addr(nt->remote_mac);
 	nt->state = STATE_DISABLED;
 	INIT_WORK(&nt->resume_wq, process_resume_target);
 	/* Set up the skb pool primitives once; enabling only refills it. */
@@ -516,7 +517,7 @@ static void netconsole_print_banner(struct netconsole_target *nt)
 		np_info(np, "remote IPv6 address %pI6c\n", &np->remote_ip.in6);
 	else
 		np_info(np, "remote IPv4 address %pI4\n", &np->remote_ip.ip);
-	np_info(np, "remote ethernet address %pM\n", np->remote_mac);
+	np_info(np, "remote ethernet address %pM\n", nt->remote_mac);
 }
 
 /* Parse the string and populate the `inet_addr` union. Return 0 if IPv4 is
@@ -672,7 +673,7 @@ static ssize_t local_mac_show(struct config_item *item, char *buf)
 
 static ssize_t remote_mac_show(struct config_item *item, char *buf)
 {
-	return sysfs_emit(buf, "%pM\n", to_target(item)->np.remote_mac);
+	return sysfs_emit(buf, "%pM\n", to_target(item)->remote_mac);
 }
 
 static ssize_t transmit_errors_show(struct config_item *item, char *buf)
@@ -1077,7 +1078,7 @@ static ssize_t remote_mac_store(struct config_item *item, const char *buf,
 		goto out_unlock;
 	if (buf[MAC_ADDR_STR_LEN] && buf[MAC_ADDR_STR_LEN] != '\n')
 		goto out_unlock;
-	memcpy(nt->np.remote_mac, remote_mac, ETH_ALEN);
+	memcpy(nt->remote_mac, remote_mac, ETH_ALEN);
 
 	ret = count;
 out_unlock:
@@ -1885,14 +1886,15 @@ static void push_udp(struct netconsole_target *nt, struct sk_buff *skb, int len)
 	netpoll_udp_checksum(np, skb, len);
 }
 
-static void push_eth(struct netpoll *np, struct sk_buff *skb)
+static void push_eth(struct netconsole_target *nt, struct sk_buff *skb)
 {
+	struct netpoll *np = &nt->np;
 	struct ethhdr *eth;
 
 	eth = skb_push(skb, ETH_HLEN);
 	skb_reset_mac_header(skb);
 	ether_addr_copy(eth->h_source, np->dev->dev_addr);
-	ether_addr_copy(eth->h_dest, np->remote_mac);
+	ether_addr_copy(eth->h_dest, nt->remote_mac);
 	if (np->ipv6)
 		eth->h_proto = htons(ETH_P_IPV6);
 	else
@@ -1980,7 +1982,7 @@ static int netpoll_send_udp(struct netconsole_target *nt, const char *msg,
 		push_ipv6(np, skb, len);
 	else
 		push_ipv4(np, skb, len);
-	push_eth(np, skb);
+	push_eth(nt, skb);
 	skb->dev = np->dev;
 
 	return (int)netpoll_send_skb(np, skb);
@@ -2375,7 +2377,7 @@ static int netconsole_parser_cmdline(struct netconsole_target *nt, char *opt)
 
 	if (*cur != 0) {
 		/* MAC address */
-		if (!mac_pton(cur, np->remote_mac))
+		if (!mac_pton(cur, nt->remote_mac))
 			goto parse_failed;
 	}
 
diff --git a/include/linux/netpoll.h b/include/linux/netpoll.h
index 5ca79fa7d943..79315461a7b1 100644
--- a/include/linux/netpoll.h
+++ b/include/linux/netpoll.h
@@ -35,7 +35,6 @@ struct netpoll {
 
 	union inet_addr local_ip, remote_ip;
 	bool ipv6;
-	u8 remote_mac[ETH_ALEN];
 };
 
 #define np_info(np, fmt, ...)				\