bpf_progs: use unsigned instead of int
This gets rid of a bunch of warnings (enabled by -Wextra)
about signed vs unsigned comparisons.
For the for loops, the compiler really should be smarter...
the so-called 'unsigned' values are *small* compile time
constants like 20 / 2 = 10 or 40 / 2 = 20.
For the 'int len' argument, it's always going to be a positive
value anyway (negative values or zero are meaningless)
Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I57fae9add1d2aea7f47ed6a897f1b0f3fb874113
diff --git a/bpf_progs/bpf_net_helpers.h b/bpf_progs/bpf_net_helpers.h
index 1511ee5..ba2f26b 100644
--- a/bpf_progs/bpf_net_helpers.h
+++ b/bpf_progs/bpf_net_helpers.h
@@ -83,7 +83,7 @@
// try to make the first 'len' header bytes readable/writable via direct packet access
// (note: AFAIK there is no way to ask for only direct packet read without also getting write)
-static inline __always_inline void try_make_writable(struct __sk_buff* skb, int len) {
+static inline __always_inline void try_make_writable(struct __sk_buff* skb, unsigned len) {
if (len > skb->len) len = skb->len;
if (skb->data_end - skb->data < len) bpf_skb_pull_data(skb, len);
}
diff --git a/bpf_progs/clatd.c b/bpf_progs/clatd.c
index f83e5ae..da6ccbf 100644
--- a/bpf_progs/clatd.c
+++ b/bpf_progs/clatd.c
@@ -177,7 +177,7 @@
// Calculate the IPv4 one's complement checksum of the IPv4 header.
__wsum sum4 = 0;
- for (int i = 0; i < sizeof(ip) / sizeof(__u16); ++i) {
+ for (unsigned i = 0; i < sizeof(ip) / sizeof(__u16); ++i) {
sum4 += ((__u16*)&ip)[i];
}
// Note that sum4 is guaranteed to be non-zero by virtue of ip.version == 4
@@ -188,7 +188,7 @@
// Calculate the *negative* IPv6 16-bit one's complement checksum of the IPv6 header.
__wsum sum6 = 0;
// We'll end up with a non-zero sum due to ip6->version == 6 (which has '0' bits)
- for (int i = 0; i < sizeof(*ip6) / sizeof(__u16); ++i) {
+ for (unsigned i = 0; i < sizeof(*ip6) / sizeof(__u16); ++i) {
sum6 += ~((__u16*)ip6)[i]; // note the bitwise negation
}
@@ -321,7 +321,7 @@
// Calculate the IPv4 one's complement checksum of the IPv4 header.
__wsum sum4 = 0;
- for (int i = 0; i < sizeof(*ip4) / sizeof(__u16); ++i) {
+ for (unsigned i = 0; i < sizeof(*ip4) / sizeof(__u16); ++i) {
sum4 += ((__u16*)ip4)[i];
}
// Note that sum4 is guaranteed to be non-zero by virtue of ip4->version == 4
@@ -387,7 +387,7 @@
// Calculate the IPv6 16-bit one's complement checksum of the IPv6 header.
__wsum sum6 = 0;
// We'll end up with a non-zero sum due to ip6.version == 6
- for (int i = 0; i < sizeof(ip6) / sizeof(__u16); ++i) {
+ for (unsigned i = 0; i < sizeof(ip6) / sizeof(__u16); ++i) {
sum6 += ((__u16*)&ip6)[i];
}
diff --git a/bpf_progs/offload.c b/bpf_progs/offload.c
index 4f152bf..3a713a0 100644
--- a/bpf_progs/offload.c
+++ b/bpf_progs/offload.c
@@ -593,7 +593,7 @@
// Calculate the IPv4 one's complement checksum of the IPv4 header.
__wsum sum4 = 0;
- for (int i = 0; i < sizeof(*ip) / sizeof(__u16); ++i) {
+ for (unsigned i = 0; i < sizeof(*ip) / sizeof(__u16); ++i) {
sum4 += ((__u16*)ip)[i];
}
// Note that sum4 is guaranteed to be non-zero by virtue of ip4->version == 4