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authorMaciej Fijalkowski <maciej.fijalkowski@intel.com>2021-03-30 00:43:06 +0200
committerAlexei Starovoitov <ast@kernel.org>2021-03-30 09:24:39 -0700
commitc9d27c9e8dc7ccced65007a4d5d3640cad42adfc (patch)
tree63b4ee169b18673ae9de82e0a481f3b5e9cf1f6f /samples
parent10397994d30f2de51bfd9321ed9ddb789464f572 (diff)
samples: bpf: Do not unload prog within xdpsock
With the introduction of bpf_link in xsk's libbpf part, there's no further need for explicit unload of prog on xdpsock's termination. When process dies, the bpf_link's refcount will be decremented and resources will be unloaded/freed under the hood in case when there are no more active users. While at it, don't dump stats on error path. Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20210329224316.17793-8-maciej.fijalkowski@intel.com
Diffstat (limited to 'samples')
-rw-r--r--samples/bpf/xdpsock_user.c55
1 files changed, 14 insertions, 41 deletions
diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c
index 1e2a1105d0e6..aa696854be78 100644
--- a/samples/bpf/xdpsock_user.c
+++ b/samples/bpf/xdpsock_user.c
@@ -96,7 +96,6 @@ static int opt_xsk_frame_size = XSK_UMEM__DEFAULT_FRAME_SIZE;
static int opt_timeout = 1000;
static bool opt_need_wakeup = true;
static u32 opt_num_xsks = 1;
-static u32 prog_id;
static bool opt_busy_poll;
static bool opt_reduced_cap;
@@ -462,59 +461,37 @@ static void *poller(void *arg)
return NULL;
}
-static void remove_xdp_program(void)
+static void int_exit(int sig)
{
- u32 curr_prog_id = 0;
- int cmd = CLOSE_CONN;
-
- if (bpf_get_link_xdp_id(opt_ifindex, &curr_prog_id, opt_xdp_flags)) {
- printf("bpf_get_link_xdp_id failed\n");
- exit(EXIT_FAILURE);
- }
- if (prog_id == curr_prog_id)
- bpf_set_link_xdp_fd(opt_ifindex, -1, opt_xdp_flags);
- else if (!curr_prog_id)
- printf("couldn't find a prog id on a given interface\n");
- else
- printf("program on interface changed, not removing\n");
-
- if (opt_reduced_cap) {
- if (write(sock, &cmd, sizeof(int)) < 0) {
- fprintf(stderr, "Error writing into stream socket: %s", strerror(errno));
- exit(EXIT_FAILURE);
- }
- }
+ benchmark_done = true;
}
-static void int_exit(int sig)
+static void __exit_with_error(int error, const char *file, const char *func,
+ int line)
{
- benchmark_done = true;
+ fprintf(stderr, "%s:%s:%i: errno: %d/\"%s\"\n", file, func,
+ line, error, strerror(error));
+ exit(EXIT_FAILURE);
}
+#define exit_with_error(error) __exit_with_error(error, __FILE__, __func__, __LINE__)
+
static void xdpsock_cleanup(void)
{
struct xsk_umem *umem = xsks[0]->umem->umem;
- int i;
+ int i, cmd = CLOSE_CONN;
dump_stats();
for (i = 0; i < num_socks; i++)
xsk_socket__delete(xsks[i]->xsk);
(void)xsk_umem__delete(umem);
- remove_xdp_program();
-}
-static void __exit_with_error(int error, const char *file, const char *func,
- int line)
-{
- fprintf(stderr, "%s:%s:%i: errno: %d/\"%s\"\n", file, func,
- line, error, strerror(error));
- dump_stats();
- remove_xdp_program();
- exit(EXIT_FAILURE);
+ if (opt_reduced_cap) {
+ if (write(sock, &cmd, sizeof(int)) < 0)
+ exit_with_error(errno);
+ }
}
-#define exit_with_error(error) __exit_with_error(error, __FILE__, __func__, \
- __LINE__)
static void swap_mac_addresses(void *data)
{
struct ether_header *eth = (struct ether_header *)data;
@@ -880,10 +857,6 @@ static struct xsk_socket_info *xsk_configure_socket(struct xsk_umem_info *umem,
if (ret)
exit_with_error(-ret);
- ret = bpf_get_link_xdp_id(opt_ifindex, &prog_id, opt_xdp_flags);
- if (ret)
- exit_with_error(-ret);
-
xsk->app_stats.rx_empty_polls = 0;
xsk->app_stats.fill_fail_polls = 0;
xsk->app_stats.copy_tx_sendtos = 0;

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