[UNIKRAFT/LIBLWIP PATCH v2 1/3] lib/lwip: Reserve per netdev space for lwip

[Sharan Santhanam <sharan.santhanam@xxxxxxxxx>]

Signed-off-by: Sharan Santhanam <sharan.santhanam@xxxxxxxxx>
---
 Config.uk   | 7 +++++++
 Makefile.uk | 1 +
 2 files changed, 8 insertions(+)

diff --git a/Config.uk b/Config.uk
index aaaaae0..d9bd2c8 100644
--- a/Config.uk
+++ b/Config.uk
@@ -22,6 +22,13 @@ config LWIP_UKNETDEV
                In case threaded mode is selected and the underlying device
                driver does not support receive interrupts the network
                interfaces have to be polled manually (uknetdev_poll()).
+
+config LWIP_UKNETDEV_SCRATCH
+       int
+       default 24
+       help
+               The network stack reserves space in the uknetdev device for its
+               use.
 endmenu
 
 config LWIP_AUTOIFACE
diff --git a/Makefile.uk b/Makefile.uk
index d3c6c9c..99005a9 100644
--- a/Makefile.uk
+++ b/Makefile.uk
@@ -62,6 +62,7 @@ LIBLWIP_COMMON_INCLUDES-y += 
-I$(LIBLWIP_BASE)/musl-imported/include
 LIBLWIP_COMMON_INCLUDES-y += -I$(LIBLWIP_EXTRACTED)/include
 CINCLUDES-$(CONFIG_LIBLWIP)   += $(LIBLWIP_COMMON_INCLUDES-y)
 CXXINCLUDES-$(CONFIG_LIBLWIP) += $(LIBLWIP_COMMON_INCLUDES-y)
+$(eval $(call uknetdev_scratch_mem,$(CONFIG_LWIP_UKNETDEV_SCRATCH)))
 
 
################################################################################
 # Library flags
-- 
2.20.1