From 07996253f11df38d623eb217405a113ebdf1c5b9 Mon Sep 17 00:00:00 2001
From: Paul Chaignon <paul@cilium.io>
Date: Fri, 10 Sep 2021 16:24:21 +0200
Subject: [PATCH] bpf/Makefile: Enable setting complexity options

In bpf/Makefile, we use environment variables MAX_XXX_OPTIONS to define
the options to use when trying to maximize the program sizes for
complexity tests. This commit simply makes it possible to override these
variables from the command line, to generate different programs for
complexity tests. For example, one can run:

    $ MAX_HOST_OPTIONS="-DENABLE_IPV4 -DENABLE_IPV6" make -C bpf bpf_host.o

Signed-off-by: Paul Chaignon <paul@cilium.io>
---
 bpf/Makefile | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/bpf/Makefile b/bpf/Makefile
index 4d7c619fff1b..af16e84aba4e 100644
--- a/bpf/Makefile
+++ b/bpf/Makefile
@@ -105,10 +105,12 @@ MAX_BASE_OPTIONS += -DENABLE_TPROXY=1 -DENABLE_REDIRECT_FAST=1 -DENABLE_BANDWIDT
 endif
 endif
 
+ifndef MAX_LB_OPTIONS
 MAX_LB_OPTIONS = $(MAX_BASE_OPTIONS) -DENABLE_NAT46=1 -DENCAP_IFINDEX=1 -DTUNNEL_MODE=1
 ifneq ("$(KERNEL)","49")
 MAX_LB_OPTIONS += -DLB_SELECTION=1 -DLB_SELECTION_MAGLEV=1
 endif
+endif
 
 bpf_sock.ll: bpf_sock.c $(LIB)
 	$(QUIET) set -e; \
@@ -125,10 +127,12 @@ bpf_sock.o: bpf_sock.ll
 	@$(ECHO_CC)
 	$(QUIET) ${LLC} ${LLC_FLAGS} -filetype=obj -o $@ $(patsubst %.o,%.ll,$@)
 
+ifndef MAX_OVERLAY_OPTIONS
 MAX_OVERLAY_OPTIONS = $(MAX_BASE_OPTIONS) -DENCAP_IFINDEX=1 -DTUNNEL_MODE=1
 ifneq ("$(KERNEL)","49")
 MAX_OVERLAY_OPTIONS += -DLB_SELECTION=1 -DLB_SELECTION_MAGLEV=1
 endif
+endif
 
 bpf_overlay.ll: bpf_overlay.c $(LIB)
 	$(QUIET) set -e; \
@@ -162,10 +166,12 @@ HOST_OPTIONS = $(LXC_OPTIONS) \
 	-DENABLE_IPV4:-DENABLE_IPV6:-DENCAP_IFINDEX:-DTUNNEL_MODE:-DPOLICY_VERDICT_NOTIFY:-DENABLE_HOST_SERVICES_UDP:-DENABLE_HOST_SERVICES_TCP:-DENABLE_NODEPORT:-DENABLE_NODEPORT_ACCELERATION:-DENABLE_DSR:-DENABLE_DSR_HYBRID:-DENABLE_PREFILTER:-DENABLE_HOST_FIREWALL: \
 	-DENABLE_IPV4:-DENABLE_IPV6:-DENCAP_IFINDEX:-DTUNNEL_MODE:-DPOLICY_VERDICT_NOTIFY:-DENABLE_HOST_SERVICES_UDP:-DENABLE_HOST_SERVICES_TCP:-DENABLE_NODEPORT:-DENABLE_NODEPORT_ACCELERATION:-DENABLE_DSR:-DENABLE_DSR_HYBRID:-DENABLE_PREFILTER:-DENABLE_SESSION_AFFINITY:-DENABLE_HOST_FIREWALL:
 
+ifndef MAX_HOST_OPTIONS
 MAX_HOST_OPTIONS = $(MAX_BASE_OPTIONS) -DENCAP_IFINDEX=1 -DTUNNEL_MODE=1
 ifneq ("$(KERNEL)","49")
 MAX_HOST_OPTIONS += -DENABLE_EGRESS_GATEWAY=1
 endif
+endif
 
 bpf_host.ll: bpf_host.c $(LIB)
 	$(QUIET) set -e; \
@@ -194,10 +200,12 @@ XDP_OPTIONS = $(LB_OPTIONS) \
 	-DENABLE_NODEPORT_ACCELERATION:-DENABLE_IPV4:-DENABLE_IPV6:-DENABLE_NODEPORT:-DENABLE_DSR:-DENABLE_CAPTURE:-DDSR_ENCAP_MODE:-DDSR_ENCAP_NONE:-DDSR_ENCAP_IPIP=2 \
 	-DENABLE_NODEPORT_ACCELERATION:-DENABLE_IPV4:-DENABLE_IPV6:-DENABLE_NODEPORT:-DENABLE_DSR:-DENABLE_CAPTURE:-DDSR_ENCAP_MODE:-DDSR_ENCAP_IPIP:-DDSR_ENCAP_NONE=2
 
+ifndef MAX_XDP_OPTIONS
 MAX_XDP_OPTIONS = $(MAX_BASE_OPTIONS) -DENABLE_PREFILTER=1
 ifneq ("$(KERNEL)","49")
 MAX_XDP_OPTIONS += -DLB_SELECTION=1 -DLB_SELECTION_MAGLEV=1
 endif
+endif
 
 bpf_xdp.ll: bpf_xdp.c $(LIB)
 	$(QUIET) set -e; \
@@ -247,10 +255,12 @@ LXC_OPTIONS = \
 
 # These options are intended to max out the BPF program complexity. it is load
 # tested as well.
+ifndef MAX_LXC_OPTIONS
 MAX_LXC_OPTIONS = $(MAX_BASE_OPTIONS) -DENCAP_IFINDEX=1 -DTUNNEL_MODE=1
 ifneq ("$(KERNEL)","49")
 MAX_LXC_OPTIONS += -DENABLE_EGRESS_GATEWAY=1
 endif
+endif
 
 bpf_lxc.ll: bpf_lxc.c $(LIB)
 	$(QUIET) set -e; \