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Date: Tue, 20 Aug 2019 13:47:05 +0200
From: Toke Høiland-Jørgensen <toke@...hat.com>
To: Stephen Hemminger <stephen@...workplumber.org>,
Daniel Borkmann <daniel@...earbox.net>,
Alexei Starovoitov <ast@...nel.org>
Cc: Martin KaFai Lau <kafai@...com>, Song Liu <songliubraving@...com>,
Yonghong Song <yhs@...com>, David Miller <davem@...emloft.net>,
Jesper Dangaard Brouer <brouer@...hat.com>,
netdev@...r.kernel.org, bpf@...r.kernel.org,
Toke Høiland-Jørgensen <toke@...hat.com>
Subject: [RFC bpf-next 4/5] iproute2: Allow compiling against libbpf
This adds a configure check for libbpf and renames functions to allow
lib/bpf.c to be compiled with it present. This makes it possible to
port functionality piecemeal to use libbpf.
Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>
---
configure | 16 ++++++++++++++++
include/bpf_util.h | 6 +++---
ip/ipvrf.c | 4 ++--
lib/bpf.c | 33 +++++++++++++++++++--------------
4 files changed, 40 insertions(+), 19 deletions(-)
diff --git a/configure b/configure
index 45fcffb6..5a89ee9f 100755
--- a/configure
+++ b/configure
@@ -238,6 +238,19 @@ check_elf()
fi
}
+check_libbpf()
+{
+ if ${PKG_CONFIG} libbpf --exists; then
+ echo "HAVE_LIBBPF:=y" >>$CONFIG
+ echo "yes"
+
+ echo 'CFLAGS += -DHAVE_LIBBPF' `${PKG_CONFIG} libbpf --cflags` >> $CONFIG
+ echo 'LDLIBS += ' `${PKG_CONFIG} libbpf --libs` >>$CONFIG
+ else
+ echo "no"
+ fi
+}
+
check_selinux()
# SELinux is a compile time option in the ss utility
{
@@ -386,6 +399,9 @@ check_selinux
echo -n "ELF support: "
check_elf
+echo -n "libbpf support: "
+check_libbpf
+
echo -n "libmnl support: "
check_mnl
diff --git a/include/bpf_util.h b/include/bpf_util.h
index 63db07ca..72d3a32c 100644
--- a/include/bpf_util.h
+++ b/include/bpf_util.h
@@ -274,9 +274,9 @@ int bpf_trace_pipe(void);
void bpf_print_ops(struct rtattr *bpf_ops, __u16 len);
-int bpf_prog_load(enum bpf_prog_type type, const struct bpf_insn *insns,
- size_t size_insns, const char *license, char *log,
- size_t size_log);
+int bpf_prog_load_buf(enum bpf_prog_type type, const struct bpf_insn *insns,
+ size_t size_insns, const char *license, char *log,
+ size_t size_log);
int bpf_prog_attach_fd(int prog_fd, int target_fd, enum bpf_attach_type type);
int bpf_prog_detach_fd(int target_fd, enum bpf_attach_type type);
diff --git a/ip/ipvrf.c b/ip/ipvrf.c
index 43366f6e..1d1aae6f 100644
--- a/ip/ipvrf.c
+++ b/ip/ipvrf.c
@@ -256,8 +256,8 @@ static int prog_load(int idx)
BPF_EXIT_INSN(),
};
- return bpf_prog_load(BPF_PROG_TYPE_CGROUP_SOCK, prog, sizeof(prog),
- "GPL", bpf_log_buf, sizeof(bpf_log_buf));
+ return bpf_prog_load_buf(BPF_PROG_TYPE_CGROUP_SOCK, prog, sizeof(prog),
+ "GPL", bpf_log_buf, sizeof(bpf_log_buf));
}
static int vrf_configure_cgroup(const char *path, int ifindex)
diff --git a/lib/bpf.c b/lib/bpf.c
index 7d2a322f..c6e3bd0d 100644
--- a/lib/bpf.c
+++ b/lib/bpf.c
@@ -28,6 +28,11 @@
#include <gelf.h>
#endif
+#ifdef HAVE_LIBBPF
+#include <bpf/libbpf.h>
+#include <bpf/bpf.h>
+#endif
+
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/un.h>
@@ -795,7 +800,7 @@ out:
return mnt;
}
-static int bpf_obj_get(const char *pathname, enum bpf_prog_type type)
+static int bpf_obj_get_path(const char *pathname, enum bpf_prog_type type)
{
union bpf_attr attr = {};
char tmp[PATH_MAX];
@@ -814,7 +819,7 @@ static int bpf_obj_get(const char *pathname, enum bpf_prog_type type)
static int bpf_obj_pinned(const char *pathname, enum bpf_prog_type type)
{
- int prog_fd = bpf_obj_get(pathname, type);
+ int prog_fd = bpf_obj_get_path(pathname, type);
if (prog_fd < 0)
fprintf(stderr, "Couldn\'t retrieve pinned program \'%s\': %s\n",
@@ -1036,7 +1041,7 @@ int bpf_graft_map(const char *map_path, uint32_t *key, int argc, char **argv)
}
}
- map_fd = bpf_obj_get(map_path, cfg.type);
+ map_fd = bpf_obj_get_path(map_path, cfg.type);
if (map_fd < 0) {
fprintf(stderr, "Couldn\'t retrieve pinned map \'%s\': %s\n",
map_path, strerror(errno));
@@ -1105,9 +1110,9 @@ static int bpf_prog_load_dev(enum bpf_prog_type type,
return bpf(BPF_PROG_LOAD, &attr, sizeof(attr));
}
-int bpf_prog_load(enum bpf_prog_type type, const struct bpf_insn *insns,
- size_t size_insns, const char *license, char *log,
- size_t size_log)
+int bpf_prog_load_buf(enum bpf_prog_type type, const struct bpf_insn *insns,
+ size_t size_insns, const char *license, char *log,
+ size_t size_log)
{
return bpf_prog_load_dev(type, insns, size_insns, license, 0,
log, size_log);
@@ -1284,7 +1289,7 @@ static int bpf_btf_load(void *btf, size_t size_btf,
return bpf(BPF_BTF_LOAD, &attr, sizeof(attr));
}
-static int bpf_obj_pin(int fd, const char *pathname)
+static int bpf_obj_pin_fd(int fd, const char *pathname)
{
union bpf_attr attr = {};
@@ -1433,7 +1438,7 @@ static int bpf_probe_pinned(const char *name, const struct bpf_elf_ctx *ctx,
return 0;
bpf_make_pathname(pathname, sizeof(pathname), name, ctx, pinning);
- return bpf_obj_get(pathname, ctx->type);
+ return bpf_obj_get_path(pathname, ctx->type);
}
static int bpf_make_obj_path(const struct bpf_elf_ctx *ctx)
@@ -1501,7 +1506,7 @@ static int bpf_place_pinned(int fd, const char *name,
return ret;
bpf_make_pathname(pathname, sizeof(pathname), name, ctx, pinning);
- return bpf_obj_pin(fd, pathname);
+ return bpf_obj_pin_fd(fd, pathname);
}
static void bpf_prog_report(int fd, const char *section,
@@ -1523,9 +1528,9 @@ static void bpf_prog_report(int fd, const char *section,
bpf_dump_error(ctx, "Verifier analysis:\n\n");
}
-static int bpf_prog_attach(const char *section,
- const struct bpf_elf_prog *prog,
- struct bpf_elf_ctx *ctx)
+static int bpf_prog_attach_section(const char *section,
+ const struct bpf_elf_prog *prog,
+ struct bpf_elf_ctx *ctx)
{
int tries = 0, fd;
retry:
@@ -2347,7 +2352,7 @@ static int bpf_fetch_prog(struct bpf_elf_ctx *ctx, const char *section,
prog.insns_num = prog.size / sizeof(struct bpf_insn);
prog.insns = data.sec_data->d_buf;
- fd = bpf_prog_attach(section, &prog, ctx);
+ fd = bpf_prog_attach_section(section, &prog, ctx);
if (fd < 0)
return fd;
@@ -2513,7 +2518,7 @@ static int bpf_fetch_prog_relo(struct bpf_elf_ctx *ctx, const char *section,
goto out;
}
- fd = bpf_prog_attach(section, prog, ctx);
+ fd = bpf_prog_attach_section(section, prog, ctx);
free(prog->insns);
if (fd < 0) {
*lderr = true;
--
2.22.1
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