From: Matt Corallo <git@bluematt.me>
Date: Wed, 8 Dec 2021 20:14:50 +0000 (+0000)
Subject: Use best instruction set that the local kernel supports
X-Git-Url: http://git.bitcoin.ninja/index.cgi?p=flowspec-xdp;a=commitdiff_plain;h=3e73d6020b9ff96340085e9c669b7d5cd0109e4b

Use best instruction set that the local kernel supports
---

diff --git a/install.sh b/install.sh
index b791d8e..2a47a1d 100755
--- a/install.sh
+++ b/install.sh
@@ -21,9 +21,9 @@ STATS_RULES="$(echo "$RULES" | ./genrules.py --8021q=drop-vlan --v6frag=ignore-p
 clang $CLANG_ARGS -g -std=c99 -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -Wno-unused-function -O3 -emit-llvm -c xdp.c -o xdp.bc
 if [ "$2" != "" ]; then
 	clang $4 -g -std=c99 -pedantic -Wall -Wextra -Wno-pointer-arith -O3 -emit-llvm -c "$2" -o wrapper.bc
-	llvm-link xdp.bc wrapper.bc | llc -O3 -march=bpf -filetype=obj -o xdp
+	llvm-link xdp.bc wrapper.bc | llc -O3 -march=bpf -mcpu=probe -filetype=obj -o xdp
 else
-	cat xdp.bc | llc -O3 -march=bpf -filetype=obj -o xdp
+	cat xdp.bc | llc -O3 -march=bpf -mcpu=probe -filetype=obj -o xdp
 fi
 
 echo "Before unload drop count was:"
diff --git a/xdp.c b/xdp.c
index f59019a..187c220 100644
--- a/xdp.c
+++ b/xdp.c
@@ -273,9 +273,9 @@ static int check_v##IPV##_persrc_ratelimit(IP_TYPE key, void *map, size_t map_li
 	struct persrc_rate##IPV##_entry *first_bucket = &buckets->entries[(hash % map_limit) & (~(SRC_HASH_BUCKET_COUNT - 1))]; \
 	bpf_spin_lock(&buckets->lock); \
  \
-	int min_sent_idx = 0; \
+	uint64_t min_sent_idx = 0; /* Must be uint64_t or BPF verifier gets lost and thinks it can be any value */ \
 	uint64_t min_sent_time = UINT64_MAX; \
-	for (int i = 0; i < SRC_HASH_BUCKET_COUNT; i++) { \
+	for (uint64_t i = 0; i < SRC_HASH_BUCKET_COUNT; i++) { \
 		if (first_bucket[i].srcip == key) { \
 			min_sent_idx = i; \
 			break; \