From: Subhra Banerjee <subhrax.banerjee@intel.com>
Date: Fri, 31 Aug 2018 12:01:19 +0530
Subject: [PATCH] UGW_SW-29163: ATM oam support

--- a/drivers/net/ppp/ppp_generic.c
+++ b/drivers/net/ppp/ppp_generic.c
@@ -2985,6 +2985,24 @@ char *ppp_dev_name(struct ppp_channel *c
 	return name;
 }
 
+/*
+ * Return the PPP device interface pointer
+ */
+struct net_device *ppp_device(struct ppp_channel *chan)
+{
+	struct channel *pch = chan->ppp;
+	struct net_device *dev = NULL;
+
+	if (pch) {
+		struct ppp *ppp;
+		rcu_read_lock();
+		ppp = rcu_dereference(pch->ppp);
+		if (ppp)
+			dev = ppp->dev;
+		rcu_read_unlock();
+	}
+	return dev;
+}
 
 /*
  * Disconnect a channel from the generic layer.
@@ -3646,6 +3664,7 @@ EXPORT_SYMBOL(ppp_unregister_channel);
 EXPORT_SYMBOL(ppp_channel_index);
 EXPORT_SYMBOL(ppp_unit_number);
 EXPORT_SYMBOL(ppp_dev_name);
+EXPORT_SYMBOL(ppp_device);
 EXPORT_SYMBOL(ppp_input);
 EXPORT_SYMBOL(ppp_input_error);
 EXPORT_SYMBOL(ppp_output_wakeup);
--- a/include/linux/ppp_channel.h
+++ b/include/linux/ppp_channel.h
@@ -75,6 +75,9 @@ extern int ppp_unit_number(struct ppp_ch
 /* Get the device name associated with a channel, or NULL if none */
 extern char *ppp_dev_name(struct ppp_channel *);
 
+/* Get the device pointer associated with a channel, or NULL if none */
+extern struct net_device *ppp_device(struct ppp_channel *);
+
 /*
  * SMP locking notes:
  * The channel code must ensure that when it calls ppp_unregister_channel,
--- a/net/atm/Kconfig
+++ b/net/atm/Kconfig
@@ -56,6 +56,12 @@ config ATM_MPOA
 	  subnetwork boundaries. These shortcut connections bypass routers
 	  enhancing overall network performance.
 
+config ATM_MPOA_INTEL_DSL_PHY_SUPPORT
+	bool "Intel DSL Phy MPOA support"
+	depends on ATM && INET && ATM_MPOA!=n
+	help
+	  Add support for Intel DSL Phy ATM MPOA
+
 config ATM_BR2684
 	tristate "RFC1483/2684 Bridged protocols"
 	depends on ATM && INET
--- a/net/atm/br2684.c
+++ b/net/atm/br2684.c
@@ -598,6 +598,11 @@ static int br2684_regvcc(struct atm_vcc
 	atmvcc->push = br2684_push;
 	atmvcc->pop = br2684_pop;
 	atmvcc->release_cb = br2684_release_cb;
+#if IS_ENABLED(CONFIG_ATM_MPOA_INTEL_DSL_PHY_SUPPORT)
+	if (atm_hook_mpoa_setup) /* IPoA or EoA w/o FCS */
+		atm_hook_mpoa_setup(atmvcc, brdev->payload == p_routed ? 3 : 0,
+			brvcc->encaps == BR2684_ENCAPS_LLC ? 1 : 0, net_dev);
+#endif
 	atmvcc->owner = THIS_MODULE;
 
 	/* initialize netdev carrier state */
--- a/net/atm/common.c
+++ b/net/atm/common.c
@@ -137,6 +137,11 @@ static struct proto vcc_proto = {
 	.release_cb = vcc_release_cb,
 };
 
+#if IS_ENABLED(CONFIG_ATM_MPOA_INTEL_DSL_PHY_SUPPORT)
+void (*atm_hook_mpoa_setup)(struct atm_vcc *, int, int, struct net_device *) = NULL;
+EXPORT_SYMBOL(atm_hook_mpoa_setup);
+#endif
+
 int vcc_create(struct net *net, struct socket *sock, int protocol, int family, int kern)
 {
 	struct sock *sk;
--- a/net/atm/common.h
+++ b/net/atm/common.h
@@ -53,4 +53,6 @@ int svc_change_qos(struct atm_vcc *vcc,s
 
 void atm_dev_release_vccs(struct atm_dev *dev);
 
+extern void (*atm_hook_mpoa_setup)(struct atm_vcc *, int, int, struct net_device *);
+
 #endif
--- a/net/atm/mpc.c
+++ b/net/atm/mpc.c
@@ -31,6 +31,7 @@
 /* Modular too */
 #include <linux/module.h>
 
+#include "common.h"
 #include "lec.h"
 #include "mpc.h"
 #include "resources.h"
@@ -645,6 +646,10 @@ static int atm_mpoa_vcc_attach(struct at
 	vcc->proto_data = mpc->dev;
 	vcc->push = mpc_push;
 
+#if IS_ENABLED(CONFIG_ATM_MPOA_INTEL_DSL_PHY_SUPPORT)
+	if (atm_hook_mpoa_setup) /* IPoA, LLC */
+		atm_hook_mpoa_setup(vcc, 3, 1, mpc->dev);
+#endif
 	return 0;
 }
 
--- a/net/atm/pppoatm.c
+++ b/net/atm/pppoatm.c
@@ -422,6 +422,12 @@ static int pppoatm_assign_vcc(struct atm
 	atmvcc->user_back = pvcc;
 	atmvcc->push = pppoatm_push;
 	atmvcc->pop = pppoatm_pop;
+#if IS_ENABLED(CONFIG_ATM_MPOA_INTEL_DSL_PHY_SUPPORT)
+	if (atm_hook_mpoa_setup) /* PPPoA */
+		atm_hook_mpoa_setup(atmvcc, 2,
+			pvcc->encaps == e_llc ? 1 : 0,
+			ppp_device(&pvcc->chan));
+#endif
 	atmvcc->release_cb = pppoatm_release_cb;
 	__module_get(THIS_MODULE);
 	atmvcc->owner = THIS_MODULE;
