v2:
- in error cases, do return; instead of break; in loop
Hello,
This patchset fixes trivial things that I found
when testing 'samples/bpf/' sample code.
I'd appreciate it, if you review this.
Thanks,
Taeung
Taeung Song (4):
samples/bpf: add missing <linux/if_vlan.h>
samples/bpf: Check the result of system()
samples/bpf: Check the error of write() and read()
samples/bpf: add .gitignore file
samples/bpf/.gitignore | 49 ++++++++++++++++++++++++++++++++
samples/bpf/parse_varlen.c | 6 +---
samples/bpf/test_overhead_user.c | 19 ++++++++++---
samples/bpf/trace_event_user.c | 27 ++++++++++++++++--
4 files changed, 89 insertions(+), 12 deletions(-)
create mode 100644 samples/bpf/.gitignore
--
2.17.1
This fixes build error regarding redefinition:
CLANG-bpf samples/bpf/parse_varlen.o
samples/bpf/parse_varlen.c:111:8: error: redefinition of 'vlan_hdr'
struct vlan_hdr {
^
./include/linux/if_vlan.h:38:8: note: previous definition is here
So remove duplicate 'struct vlan_hdr' in sample code and include if_vlan.h
Signed-off-by: Taeung Song <[email protected]>
---
samples/bpf/parse_varlen.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)
diff --git a/samples/bpf/parse_varlen.c b/samples/bpf/parse_varlen.c
index 95c16324760c..0b6f22feb2c9 100644
--- a/samples/bpf/parse_varlen.c
+++ b/samples/bpf/parse_varlen.c
@@ -6,6 +6,7 @@
*/
#define KBUILD_MODNAME "foo"
#include <linux/if_ether.h>
+#include <linux/if_vlan.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/in.h>
@@ -108,11 +109,6 @@ static int parse_ipv6(void *data, uint64_t nh_off, void *data_end)
return 0;
}
-struct vlan_hdr {
- uint16_t h_vlan_TCI;
- uint16_t h_vlan_encapsulated_proto;
-};
-
SEC("varlen")
int handle_ingress(struct __sk_buff *skb)
{
--
2.17.1
For untracked executables of samples/bpf, add this.
Untracked files:
(use "git add <file>..." to include in what will be committed)
samples/bpf/cpustat
samples/bpf/fds_example
samples/bpf/lathist
samples/bpf/load_sock_ops
...
Signed-off-by: Taeung Song <[email protected]>
---
samples/bpf/.gitignore | 49 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 49 insertions(+)
create mode 100644 samples/bpf/.gitignore
diff --git a/samples/bpf/.gitignore b/samples/bpf/.gitignore
new file mode 100644
index 000000000000..8ae4940025f8
--- /dev/null
+++ b/samples/bpf/.gitignore
@@ -0,0 +1,49 @@
+cpustat
+fds_example
+lathist
+load_sock_ops
+lwt_len_hist
+map_perf_test
+offwaketime
+per_socket_stats_example
+sampleip
+sock_example
+sockex1
+sockex2
+sockex3
+spintest
+syscall_nrs.h
+syscall_tp
+task_fd_query
+tc_l2_redirect
+test_cgrp2_array_pin
+test_cgrp2_attach
+test_cgrp2_attach2
+test_cgrp2_sock
+test_cgrp2_sock2
+test_current_task_under_cgroup
+test_lru_dist
+test_map_in_map
+test_overhead
+test_probe_write_user
+trace_event
+trace_output
+tracex1
+tracex2
+tracex3
+tracex4
+tracex5
+tracex6
+tracex7
+xdp1
+xdp2
+xdp_adjust_tail
+xdp_fwd
+xdp_monitor
+xdp_redirect
+xdp_redirect_cpu
+xdp_redirect_map
+xdp_router_ipv4
+xdp_rxq_info
+xdp_tx_iptunnel
+xdpsock
--
2.17.1
test_task_rename() and test_urandom_read()
can be failed during write() and read(),
So check the result of them.
Reviewed-by: David Laight <[email protected]>
Signed-off-by: Taeung Song <[email protected]>
---
samples/bpf/test_overhead_user.c | 19 +++++++++++++++----
1 file changed, 15 insertions(+), 4 deletions(-)
diff --git a/samples/bpf/test_overhead_user.c b/samples/bpf/test_overhead_user.c
index 6caf47afa635..9d6dcaa9db92 100644
--- a/samples/bpf/test_overhead_user.c
+++ b/samples/bpf/test_overhead_user.c
@@ -6,6 +6,7 @@
*/
#define _GNU_SOURCE
#include <sched.h>
+#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <asm/unistd.h>
@@ -44,8 +45,13 @@ static void test_task_rename(int cpu)
exit(1);
}
start_time = time_get_ns();
- for (i = 0; i < MAX_CNT; i++)
- write(fd, buf, sizeof(buf));
+ for (i = 0; i < MAX_CNT; i++) {
+ if (write(fd, buf, sizeof(buf)) < 0) {
+ printf("task rename failed: %s\n", strerror(errno));
+ close(fd);
+ return;
+ }
+ }
printf("task_rename:%d: %lld events per sec\n",
cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
close(fd);
@@ -63,8 +69,13 @@ static void test_urandom_read(int cpu)
exit(1);
}
start_time = time_get_ns();
- for (i = 0; i < MAX_CNT; i++)
- read(fd, buf, sizeof(buf));
+ for (i = 0; i < MAX_CNT; i++) {
+ if (read(fd, buf, sizeof(buf)) < 0) {
+ printf("failed to read from /dev/urandom: %s\n", strerror(errno));
+ close(fd);
+ return;
+ }
+ }
printf("urandom_read:%d: %lld events per sec\n",
cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
close(fd);
--
2.17.1
To avoid the below build warning message,
use new generate_load() checking the return value.
ignoring return value of ‘system’, declared with attribute warn_unused_result
And it also refactors the duplicate code of both
test_perf_event_all_cpu() and test_perf_event_task()
Cc: Teng Qin <[email protected]>
Signed-off-by: Taeung Song <[email protected]>
---
samples/bpf/trace_event_user.c | 27 ++++++++++++++++++++++++---
1 file changed, 24 insertions(+), 3 deletions(-)
diff --git a/samples/bpf/trace_event_user.c b/samples/bpf/trace_event_user.c
index 1fa1becfa641..d08046ab81f0 100644
--- a/samples/bpf/trace_event_user.c
+++ b/samples/bpf/trace_event_user.c
@@ -122,6 +122,16 @@ static void print_stacks(void)
}
}
+static inline int generate_load(void)
+{
+ if (system("dd if=/dev/zero of=/dev/null count=5000k status=none") < 0) {
+ printf("failed to generate some load with dd: %s\n", strerror(errno));
+ return -1;
+ }
+
+ return 0;
+}
+
static void test_perf_event_all_cpu(struct perf_event_attr *attr)
{
int nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
@@ -142,7 +152,11 @@ static void test_perf_event_all_cpu(struct perf_event_attr *attr)
assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_SET_BPF, prog_fd[0]) == 0);
assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_ENABLE) == 0);
}
- system("dd if=/dev/zero of=/dev/null count=5000k status=none");
+
+ if (generate_load() < 0) {
+ error = 1;
+ goto all_cpu_err;
+ }
print_stacks();
all_cpu_err:
for (i--; i >= 0; i--) {
@@ -156,7 +170,7 @@ static void test_perf_event_all_cpu(struct perf_event_attr *attr)
static void test_perf_event_task(struct perf_event_attr *attr)
{
- int pmu_fd;
+ int pmu_fd, error = 0;
/* per task perf event, enable inherit so the "dd ..." command can be traced properly.
* Enabling inherit will cause bpf_perf_prog_read_time helper failure.
@@ -171,10 +185,17 @@ static void test_perf_event_task(struct perf_event_attr *attr)
}
assert(ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd[0]) == 0);
assert(ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE) == 0);
- system("dd if=/dev/zero of=/dev/null count=5000k status=none");
+
+ if (generate_load() < 0) {
+ error = 1;
+ goto err;
+ }
print_stacks();
+err:
ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE);
close(pmu_fd);
+ if (error)
+ int_exit(0);
}
static void test_bpf_perf_event(void)
--
2.17.1
From: Taeung Song <[email protected]>
Date: Wed, 4 Jul 2018 22:36:37 +0900
> To avoid the below build warning message,
> use new generate_load() checking the return value.
>
> ignoring return value of ?system?, declared with attribute warn_unused_result
>
> And it also refactors the duplicate code of both
> test_perf_event_all_cpu() and test_perf_event_task()
>
> Cc: Teng Qin <[email protected]>
> Signed-off-by: Taeung Song <[email protected]>
Acked-by: David S. Miller <[email protected]>
From: Taeung Song <[email protected]>
Date: Wed, 4 Jul 2018 22:36:39 +0900
> For untracked executables of samples/bpf, add this.
>
> Untracked files:
> (use "git add <file>..." to include in what will be committed)
>
> samples/bpf/cpustat
> samples/bpf/fds_example
> samples/bpf/lathist
> samples/bpf/load_sock_ops
> ...
>
> Signed-off-by: Taeung Song <[email protected]>
Acked-by: David S. Miller <[email protected]>
From: Taeung Song <[email protected]>
Date: Wed, 4 Jul 2018 22:36:36 +0900
> This fixes build error regarding redefinition:
>
> CLANG-bpf samples/bpf/parse_varlen.o
> samples/bpf/parse_varlen.c:111:8: error: redefinition of 'vlan_hdr'
> struct vlan_hdr {
> ^
> ./include/linux/if_vlan.h:38:8: note: previous definition is here
>
> So remove duplicate 'struct vlan_hdr' in sample code and include if_vlan.h
>
> Signed-off-by: Taeung Song <[email protected]>
Acked-by: David S. Miller <[email protected]>
From: Taeung Song <[email protected]>
Date: Wed, 4 Jul 2018 22:36:38 +0900
> test_task_rename() and test_urandom_read()
> can be failed during write() and read(),
> So check the result of them.
>
> Reviewed-by: David Laight <[email protected]>
> Signed-off-by: Taeung Song <[email protected]>
Acked-by: David S. Miller <[email protected]>
On 07/04/2018 03:36 PM, Taeung Song wrote:
> v2:
> - in error cases, do return; instead of break; in loop
>
> Hello,
> This patchset fixes trivial things that I found
> when testing 'samples/bpf/' sample code.
> I'd appreciate it, if you review this.
>
> Thanks,
> Taeung
Applied to bpf, thanks Taeung!