After commit 1dab47139e61 ("appletalk: remove ipddp driver") removes the
config IPDDP, there is some minor code clean-up possible in the appletalk
network layer.

Remove some code in appletalk layer after the ipddp driver is gone.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
---
 net/appletalk/ddp.c | 36 ------------------------------------
 1 file changed, 36 deletions(-)

diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c
index 8978fb6212ff..9ba04a69ec2a 100644
--- a/net/appletalk/ddp.c
+++ b/net/appletalk/ddp.c
@@ -1284,39 +1284,6 @@ static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
 	return err;
 }
 
-#if IS_ENABLED(CONFIG_IPDDP)
-static __inline__ int is_ip_over_ddp(struct sk_buff *skb)
-{
-	return skb->data[12] == 22;
-}
-
-static int handle_ip_over_ddp(struct sk_buff *skb)
-{
-	struct net_device *dev = __dev_get_by_name(&init_net, "ipddp0");
-	struct net_device_stats *stats;
-
-	/* This needs to be able to handle ipddp"N" devices */
-	if (!dev) {
-		kfree_skb(skb);
-		return NET_RX_DROP;
-	}
-
-	skb->protocol = htons(ETH_P_IP);
-	skb_pull(skb, 13);
-	skb->dev   = dev;
-	skb_reset_transport_header(skb);
-
-	stats = netdev_priv(dev);
-	stats->rx_packets++;
-	stats->rx_bytes += skb->len + 13;
-	return netif_rx(skb);  /* Send the SKB up to a higher place. */
-}
-#else
-/* make it easy for gcc to optimize this test out, i.e. kill the code */
-#define is_ip_over_ddp(skb) 0
-#define handle_ip_over_ddp(skb) 0
-#endif
-
 static int atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
 			      struct ddpehdr *ddp, __u16 len_hops, int origlen)
 {
@@ -1480,9 +1447,6 @@ static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
 		return atalk_route_packet(skb, dev, ddp, len_hops, origlen);
 	}
 
-	/* if IP over DDP is not selected this code will be optimized out */
-	if (is_ip_over_ddp(skb))
-		return handle_ip_over_ddp(skb);
 	/*
 	 * Which socket - atalk_search_socket() looks for a *full match*
 	 * of the <net, node, port> tuple.
-- 
2.17.1

Hello:

This patch was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Thu, 12 Oct 2023 08:34:43 +0200 you wrote:
> After commit 1dab47139e61 ("appletalk: remove ipddp driver") removes the
> config IPDDP, there is some minor code clean-up possible in the appletalk
> network layer.
> 
> Remove some code in appletalk layer after the ipddp driver is gone.
> 
> Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
> 
> [...]

Here is the summary with links:
  - appletalk: remove special handling code for ipddp
    https://git.kernel.org/netdev/net-next/c/85605fb694f0

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

On Thu, Oct 12, 2023 at 08:34:43AM +0200, Lukas Bulwahn wrote:
> After commit 1dab47139e61 ("appletalk: remove ipddp driver") removes the
> config IPDDP, there is some minor code clean-up possible in the appletalk
> network layer.
> 
> Remove some code in appletalk layer after the ipddp driver is gone.
> 
> Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>

Thanks,

CONFIG_IPDDP is gone so this code doesn't do anything.

Reviewed-by: Simon Horman <horms@kernel.org>

As a further follow-up should we consider dropping CONFIG_IPDDP*
from various defconfigs it appears in?