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Message-ID: <1461175313-38310-5-git-send-email-wangnan0@huawei.com>
Date: Wed, 20 Apr 2016 18:01:44 +0000
From: Wang Nan <wangnan0@...wei.com>
To: <acme@...nel.org>, <jolsa@...hat.com>, <brendan.d.gregg@...il.com>
CC: <linux-kernel@...r.kernel.org>, <pi3orama@....com>,
Wang Nan <wangnan0@...wei.com>,
Arnaldo Carvalho de Melo <acme@...hat.com>,
"Alexei Starovoitov" <ast@...nel.org>,
Jiri Olsa <jolsa@...nel.org>, Li Zefan <lizefan@...wei.com>
Subject: [RFC PATCH 04/13] bpf tools: Replace fd array to union array
Following commits will add new types for instance of a bpf program.
For kernel bpf program, a program instance is fd. For ubpf program,
the instance of a program is a 'struct ubpf_vm'. This patch promote
original 'fds' array to 'union prog_instance' array, prepare for
further extending.
Signed-off-by: Wang Nan <wangnan0@...wei.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Brendan Gregg <brendan.d.gregg@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Li Zefan <lizefan@...wei.com>
---
tools/lib/bpf/libbpf.c | 44 ++++++++++++++++++++++++--------------------
1 file changed, 24 insertions(+), 20 deletions(-)
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 55b739e..dd5a107 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -138,6 +138,10 @@ int libbpf_strerror(int err, char *buf, size_t size)
# define LIBBPF_ELF_C_READ_MMAP ELF_C_READ
#endif
+union prog_instance {
+ int fd;
+};
+
/*
* bpf_prog should be a better name but it has been used in
* linux/filter.h.
@@ -157,7 +161,7 @@ struct bpf_program {
struct {
int nr;
- int *fds;
+ union prog_instance *array;
} instances;
bpf_program_prep_t preprocessor;
@@ -229,14 +233,14 @@ static void bpf_program__unload(struct bpf_program *prog)
*/
if (prog->instances.nr > 0) {
for (i = 0; i < prog->instances.nr; i++)
- zclose(prog->instances.fds[i]);
+ zclose(prog->instances.array[i].fd);
} else if (prog->instances.nr != -1) {
pr_warning("Internal error: instances.nr is %d\n",
prog->instances.nr);
}
prog->instances.nr = -1;
- zfree(&prog->instances.fds);
+ zfree(&prog->instances.array);
}
static void bpf_program__exit(struct bpf_program *prog)
@@ -287,7 +291,7 @@ bpf_program__init(void *data, size_t size, char *name, int idx,
memcpy(prog->insns, data,
prog->insns_cnt * sizeof(struct bpf_insn));
prog->idx = idx;
- prog->instances.fds = NULL;
+ prog->instances.array = NULL;
prog->instances.nr = -1;
return 0;
@@ -937,20 +941,20 @@ bpf_program__load(struct bpf_program *prog,
{
int err = 0, fd, i;
- if (prog->instances.nr < 0 || !prog->instances.fds) {
+ if (prog->instances.nr < 0 || !prog->instances.array) {
if (prog->preprocessor) {
pr_warning("Internal error: can't load program '%s'\n",
prog->section_name);
return -LIBBPF_ERRNO__INTERNAL;
}
- prog->instances.fds = malloc(sizeof(int));
- if (!prog->instances.fds) {
- pr_warning("Not enough memory for BPF fds\n");
+ prog->instances.array = malloc(sizeof(union prog_instance));
+ if (!prog->instances.array) {
+ pr_warning("Not enough memory for BPF instance\n");
return -ENOMEM;
}
prog->instances.nr = 1;
- prog->instances.fds[0] = -1;
+ prog->instances.array[0].fd = -1;
}
if (!prog->preprocessor) {
@@ -961,7 +965,7 @@ bpf_program__load(struct bpf_program *prog,
err = load_program(prog->insns, prog->insns_cnt,
license, kern_version, &fd);
if (!err)
- prog->instances.fds[0] = fd;
+ prog->instances.array[0].fd = fd;
goto out;
}
@@ -981,7 +985,7 @@ bpf_program__load(struct bpf_program *prog,
if (!result.new_insn_ptr || !result.new_insn_cnt) {
pr_debug("Skip loading the %dth instance of program '%s'\n",
i, prog->section_name);
- prog->instances.fds[i] = -1;
+ prog->instances.array[i].fd = -1;
if (result.pfd)
*result.pfd = -1;
continue;
@@ -999,7 +1003,7 @@ bpf_program__load(struct bpf_program *prog,
if (result.pfd)
*result.pfd = fd;
- prog->instances.fds[i] = fd;
+ prog->instances.array[i].fd = fd;
}
out:
if (err)
@@ -1269,27 +1273,27 @@ int bpf_program__fd(struct bpf_program *prog)
int bpf_program__set_prep(struct bpf_program *prog, int nr_instances,
bpf_program_prep_t prep)
{
- int *instances_fds;
+ union prog_instance *array;
if (nr_instances <= 0 || !prep)
return -EINVAL;
- if (prog->instances.nr > 0 || prog->instances.fds) {
+ if (prog->instances.nr > 0 || prog->instances.array) {
pr_warning("Can't set pre-processor after loading\n");
return -EINVAL;
}
- instances_fds = malloc(sizeof(int) * nr_instances);
- if (!instances_fds) {
- pr_warning("alloc memory failed for fds\n");
+ array = malloc(sizeof(array[0]) * nr_instances);
+ if (!array) {
+ pr_warning("alloc memory failed for instances\n");
return -ENOMEM;
}
/* fill all fd with -1 */
- memset(instances_fds, -1, sizeof(int) * nr_instances);
+ memset(array, -1, sizeof(array[0]) * nr_instances);
prog->instances.nr = nr_instances;
- prog->instances.fds = instances_fds;
+ prog->instances.array = array;
prog->preprocessor = prep;
return 0;
}
@@ -1304,7 +1308,7 @@ int bpf_program__nth_fd(struct bpf_program *prog, int n)
return -EINVAL;
}
- fd = prog->instances.fds[n];
+ fd = prog->instances.array[n].fd;
if (fd < 0) {
pr_warning("%dth instance of program '%s' is invalid\n",
n, prog->section_name);
--
1.8.3.4
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