gluon-core: allow zero VXLAN UDP checksum on RX

Also disabling TX checksums and not only allowing incoming packets without
checksum will provide another small speedup. As doing so would break wired
meshing with VXLAN-enabled nodes that require non-zero checksums, we will
wait a few days before this step.

package/gluon-core/files/lib/netifd/proto/gluon_wired.sh

@@ -45,6 +45,7 @@ proto_gluon_wired_setup() {
                 json_add_string ip6addr "$(interface_linklocal "$ifname")"
                 json_add_string peer6addr 'ff02::15c'
                 json_add_int vid "$(lua -lgluon.util -e 'print(tonumber(gluon.util.domain_seed_bytes("gluon-mesh-vxlan", 3), 16))')"
+                json_add_boolean rxcsum '0'
                 json_close_object
                 ubus call network add_dynamic "$(json_dump)"
         fi

patches/lede/0062-netifd-system-linux-VXLAN-add-options-to-enable-and-disable-UDP-checksums.patch

@@ -0,0 +1,75 @@
+From: Matthias Schiffer <mschiffer@universe-factory.net>
+Date: Wed, 24 Jan 2018 20:53:32 +0100
+Subject: netifd: system-linux: VXLAN: add options to enable and disable UDP checksums
+
+diff --git a/package/network/config/netifd/patches/0002-system-linux-VXLAN-add-options-to-enable-and-disable.patch b/package/network/config/netifd/patches/0002-system-linux-VXLAN-add-options-to-enable-and-disable.patch
+new file mode 100644
+index 0000000000000000000000000000000000000000..67a8bb864be37fa97dfcce4dd841bacafefcd0fc
+--- /dev/null
++++ b/package/network/config/netifd/patches/0002-system-linux-VXLAN-add-options-to-enable-and-disable.patch
+@@ -0,0 +1,65 @@
++From af3cadb6a46ba93e8a729e71d82b176275931e62 Mon Sep 17 00:00:00 2001
++Message-Id: <af3cadb6a46ba93e8a729e71d82b176275931e62.1516821520.git.mschiffer@universe-factory.net>
++From: Matthias Schiffer <mschiffer@universe-factory.net>
++Date: Wed, 24 Jan 2018 13:21:44 +0100
++Subject: [PATCH] system-linux: VXLAN: add options to enable and disable UDP
++ checksums
++
++Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
++---
++ system-linux.c | 11 +++++++++++
++ system.c       |  2 ++
++ system.h       |  2 ++
++ 3 files changed, 15 insertions(+)
++
++diff --git a/system-linux.c b/system-linux.c
++index 32d6ffc..0277886 100644
++--- a/system-linux.c
+++++ b/system-linux.c
++@@ -2841,6 +2841,17 @@ static int system_add_vxlan(const char *name, const unsigned int link, struct bl
++ 	}
++ 	nla_put_u16(msg, IFLA_VXLAN_PORT, htons(port));
++ 
+++	if ((cur = tb_data[VXLAN_DATA_ATTR_RXCSUM])) {
+++		bool rxcsum = blobmsg_get_bool(cur);
+++		nla_put_u8(msg, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, !rxcsum);
+++	}
+++
+++	if ((cur = tb_data[VXLAN_DATA_ATTR_TXCSUM])) {
+++		bool txcsum = blobmsg_get_bool(cur);
+++		nla_put_u8(msg, IFLA_VXLAN_UDP_CSUM, txcsum);
+++		nla_put_u8(msg, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, !txcsum);
+++	}
+++
++ 	if ((cur = tb[TUNNEL_ATTR_TOS])) {
++ 		char *str = blobmsg_get_string(cur);
++ 		unsigned tos = 1;
++diff --git a/system.c b/system.c
++index 5555272..e236e96 100644
++--- a/system.c
+++++ b/system.c
++@@ -36,6 +36,8 @@ static const struct blobmsg_policy vxlan_data_attrs[__VXLAN_DATA_ATTR_MAX] = {
++ 	[VXLAN_DATA_ATTR_ID] = { .name = "id", .type = BLOBMSG_TYPE_INT32 },
++ 	[VXLAN_DATA_ATTR_PORT] = { .name = "port", .type = BLOBMSG_TYPE_INT32 },
++ 	[VXLAN_DATA_ATTR_MACADDR] = { .name = "macaddr", .type = BLOBMSG_TYPE_STRING },
+++	[VXLAN_DATA_ATTR_RXCSUM] = { .name = "rxcsum", .type = BLOBMSG_TYPE_BOOL },
+++	[VXLAN_DATA_ATTR_TXCSUM] = { .name = "txcsum", .type = BLOBMSG_TYPE_BOOL },
++ };
++ 
++ const struct uci_blob_param_list vxlan_data_attr_list = {
++diff --git a/system.h b/system.h
++index 61c72c2..371a524 100644
++--- a/system.h
+++++ b/system.h
++@@ -41,6 +41,8 @@ enum vxlan_data {
++ 	VXLAN_DATA_ATTR_ID,
++ 	VXLAN_DATA_ATTR_PORT,
++ 	VXLAN_DATA_ATTR_MACADDR,
+++	VXLAN_DATA_ATTR_RXCSUM,
+++	VXLAN_DATA_ATTR_TXCSUM,
++ 	__VXLAN_DATA_ATTR_MAX
++ };
++ 
++-- 
++2.16.1
++

patches/lede/0063-vxlan-add-options-to-enable-and-disable-UDP-checksums.patch

@@ -0,0 +1,43 @@
+From: Matthias Schiffer <mschiffer@universe-factory.net>
+Date: Wed, 24 Jan 2018 13:51:45 +0100
+Subject: vxlan: add options to enable and disable UDP checksums
+
+Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
+
+diff --git a/package/network/config/vxlan/Makefile b/package/network/config/vxlan/Makefile
+index a471d4e90cbe30c1d1dd01dbf7553995d8c0485e..aeceb9cd884e517b2f274925637b62a538bfa70e 100644
+--- a/package/network/config/vxlan/Makefile
++++ b/package/network/config/vxlan/Makefile
+@@ -1,7 +1,7 @@
+ include $(TOPDIR)/rules.mk
+ 
+ PKG_NAME:=vxlan
+-PKG_VERSION:=1
++PKG_VERSION:=2
+ PKG_LICENSE:=GPL-2.0
+ 
+ include $(INCLUDE_DIR)/package.mk
+diff --git a/package/network/config/vxlan/files/vxlan.sh b/package/network/config/vxlan/files/vxlan.sh
+index 27ccd8f12759f69c7c226cac0c923335b8ccc6a8..d055d41edc59f50c0c132849bbcd0235edeef5b9 100755
+--- a/package/network/config/vxlan/files/vxlan.sh
++++ b/package/network/config/vxlan/files/vxlan.sh
+@@ -15,8 +15,8 @@ vxlan_generic_setup() {
+ 
+ 	local link="$cfg"
+ 
+-	local port vid ttl tos mtu macaddr zone
+-	json_get_vars port vid ttl tos mtu macaddr zone
++	local port vid ttl tos mtu macaddr zone rxcsum txcsum
++	json_get_vars port vid ttl tos mtu macaddr zone rxcsum txcsum
+ 
+ 
+ 	proto_init_update "$link" 1
+@@ -36,6 +36,8 @@ vxlan_generic_setup() {
+ 	[ -n "$port" ] && json_add_int port "$port"
+ 	[ -n "$vid" ] && json_add_int id "$vid"
+ 	[ -n "$macaddr" ] && json_add_string macaddr "$macaddr"
++	[ -n "$rxcsum" ] && json_add_boolean rxcsum "$rxcsum"
++	[ -n "$txcsum" ] && json_add_boolean txcsum "$txcsum"
+ 	json_close_object
+ 
+ 	proto_close_tunnel