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Message-ID: <20220407151217.GA8736@codemonkey.org.uk>
Date: Thu, 7 Apr 2022 11:12:17 -0400
From: Dave Jones <davej@...emonkey.org.uk>
To: netdev@...r.kernel.org
Cc: Roopa Prabhu <roopa@...dia.com>,
Nikolay Aleksandrov <razor@...ckwall.org>,
bridge@...ts.linux-foundation.org, Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH] decouple llc/bridge
I was wondering why the llc code was getting compiled and it turned out
to be because I had bridging enabled. It turns out to only needs it for
a single function (llc_mac_hdr_init).
Converting this to a static inline like the other llc functions it uses
allows to decouple the dependency
Signed-off-by: Dave Jones <davej@...emonkey.org.uk>
diff --git include/net/llc.h include/net/llc.h
index e250dca03963..edcb120ee6b0 100644
--- include/net/llc.h
+++ include/net/llc.h
@@ -13,6 +13,7 @@
*/
#include <linux/if.h>
+#include <linux/if_arp.h>
#include <linux/if_ether.h>
#include <linux/list.h>
#include <linux/spinlock.h>
@@ -100,8 +101,34 @@ extern struct list_head llc_sap_list;
int llc_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
struct net_device *orig_dev);
-int llc_mac_hdr_init(struct sk_buff *skb, const unsigned char *sa,
- const unsigned char *da);
+/**
+ * llc_mac_hdr_init - fills MAC header fields
+ * @skb: Address of the frame to initialize its MAC header
+ * @sa: The MAC source address
+ * @da: The MAC destination address
+ *
+ * Fills MAC header fields, depending on MAC type. Returns 0, If MAC type
+ * is a valid type and initialization completes correctly 1, otherwise.
+ */
+static inline int llc_mac_hdr_init(struct sk_buff *skb,
+ const unsigned char *sa, const unsigned char *da)
+{
+ int rc = -EINVAL;
+
+ switch (skb->dev->type) {
+ case ARPHRD_ETHER:
+ case ARPHRD_LOOPBACK:
+ rc = dev_hard_header(skb, skb->dev, ETH_P_802_2, da, sa,
+ skb->len);
+ if (rc > 0)
+ rc = 0;
+ break;
+ default:
+ break;
+ }
+ return rc;
+}
+
void llc_add_pack(int type,
void (*handler)(struct llc_sap *sap, struct sk_buff *skb));
diff --git net/802/Kconfig net/802/Kconfig
index aaa83e888240..8bea5d1d5118 100644
--- net/802/Kconfig
+++ net/802/Kconfig
@@ -1,7 +1,6 @@
# SPDX-License-Identifier: GPL-2.0-only
config STP
tristate
- select LLC
config GARP
tristate
diff --git net/bridge/Kconfig net/bridge/Kconfig
index 3c8ded7d3e84..c011856d3386 100644
--- net/bridge/Kconfig
+++ net/bridge/Kconfig
@@ -5,7 +5,6 @@
config BRIDGE
tristate "802.1d Ethernet Bridging"
- select LLC
select STP
depends on IPV6 || IPV6=n
help
diff --git net/llc/llc_output.c net/llc/llc_output.c
index 5a6466fc626a..ad66886ed141 100644
--- net/llc/llc_output.c
+++ net/llc/llc_output.c
@@ -13,34 +13,6 @@
#include <net/llc.h>
#include <net/llc_pdu.h>
-/**
- * llc_mac_hdr_init - fills MAC header fields
- * @skb: Address of the frame to initialize its MAC header
- * @sa: The MAC source address
- * @da: The MAC destination address
- *
- * Fills MAC header fields, depending on MAC type. Returns 0, If MAC type
- * is a valid type and initialization completes correctly 1, otherwise.
- */
-int llc_mac_hdr_init(struct sk_buff *skb,
- const unsigned char *sa, const unsigned char *da)
-{
- int rc = -EINVAL;
-
- switch (skb->dev->type) {
- case ARPHRD_ETHER:
- case ARPHRD_LOOPBACK:
- rc = dev_hard_header(skb, skb->dev, ETH_P_802_2, da, sa,
- skb->len);
- if (rc > 0)
- rc = 0;
- break;
- default:
- break;
- }
- return rc;
-}
-
/**
* llc_build_and_send_ui_pkt - unitdata request interface for upper layers
* @sap: sap to use
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