netdev - [PATCH v4 bpf-next 07/17] samples: bpf: do not unload prog within xdpsock

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Date:   Sat, 27 Mar 2021 00:09:28 +0100
From:   Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To:     bpf@...r.kernel.org, netdev@...r.kernel.org, daniel@...earbox.net,
        ast@...nel.org, andrii@...nel.org
Cc:     bjorn.topel@...el.com, magnus.karlsson@...el.com,
        ciara.loftus@...el.com, john.fastabend@...il.com, toke@...hat.com,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Subject: [PATCH v4 bpf-next 07/17] 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@...el.com>
---
 samples/bpf/xdpsock_user.c | 55 ++++++++++----------------------------
 1 file 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;
-- 
2.20.1