Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android

Conflicts:
* arch/arm64/include/asm/assembler.h
    Pick changes from AOSP Change-Id: I450594dc311b09b6b832b707a9abb357608cc6e4
    ("UPSTREAM: arm64: include alternative handling in dcache_by_line_op").

* drivers/android/binder.c
    Pick changes from LTS commit 14f09e8e7cd8 ("ANDROID: binder: Add strong ref checks"),
    instead of AOSP Change-Id: I66c15b066808f28bd27bfe50fd0e03ff45a09fca
    ("ANDROID: binder: Add strong ref checks").

* drivers/usb/gadget/function/u_ether.c
    Refactor throttling of highspeed IRQ logic in AOSP by adding
    a check for last queue request as intended by LTS commit
    660c04e8f174 ("usb: gadget: function: u_ether: don't starve tx request queue").
    Fixes AOSP Change-Id: I26515bfd9bbc8f7af38be7835692143f7093118a
    ("USB: gadget: u_ether: Fix data stall issue in RNDIS tethering mode").

Signed-off-by: Amit Pundir <amit.pundir@linaro.org>

1 files changed, 39 insertions, 1 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 12b4d54a8ffa..9d6025703f73 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2003,7 +2003,10 @@ struct napi_gro_cb {
 	/* Used in foo-over-udp, set in udp[46]_gro_receive */
 	u8	is_ipv6:1;
 
-	/* 7 bit hole */
+	/* Number of gro_receive callbacks this packet already went through */
+	u8 recursion_counter:4;
+
+	/* 3 bit hole */
 
 	/* used to support CHECKSUM_COMPLETE for tunneling protocols */
 	__wsum	csum;
@@ -2014,6 +2017,25 @@ struct napi_gro_cb {
 
 #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
 
+#define GRO_RECURSION_LIMIT 15
+static inline int gro_recursion_inc_test(struct sk_buff *skb)
+{
+	return ++NAPI_GRO_CB(skb)->recursion_counter == GRO_RECURSION_LIMIT;
+}
+
+typedef struct sk_buff **(*gro_receive_t)(struct sk_buff **, struct sk_buff *);
+static inline struct sk_buff **call_gro_receive(gro_receive_t cb,
+						struct sk_buff **head,
+						struct sk_buff *skb)
+{
+	if (unlikely(gro_recursion_inc_test(skb))) {
+		NAPI_GRO_CB(skb)->flush |= 1;
+		return NULL;
+	}
+
+	return cb(head, skb);
+}
+
 struct packet_type {
 	__be16			type;	/* This is really htons(ether_type). */
 	struct net_device	*dev;	/* NULL is wildcarded here	     */
@@ -2059,6 +2081,22 @@ struct udp_offload {
 	struct udp_offload_callbacks callbacks;
 };
 
+typedef struct sk_buff **(*gro_receive_udp_t)(struct sk_buff **,
+					      struct sk_buff *,
+					      struct udp_offload *);
+static inline struct sk_buff **call_gro_receive_udp(gro_receive_udp_t cb,
+						    struct sk_buff **head,
+						    struct sk_buff *skb,
+						    struct udp_offload *uoff)
+{
+	if (unlikely(gro_recursion_inc_test(skb))) {
+		NAPI_GRO_CB(skb)->flush |= 1;
+		return NULL;
+	}
+
+	return cb(head, skb, uoff);
+}
+
 /* often modified stats are per cpu, other are shared (netdev->stats) */
 struct pcpu_sw_netstats {
 	u64     rx_packets;