netdev - [PATCH bpf-next 09/13] selftests: xsk: fix socket creation retry

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Date:   Wed, 22 Sep 2021 09:56:09 +0200
From:   Magnus Karlsson <magnus.karlsson@...il.com>
To:     magnus.karlsson@...el.com, bjorn@...nel.org, ast@...nel.org,
        daniel@...earbox.net, netdev@...r.kernel.org,
        maciej.fijalkowski@...el.com, ciara.loftus@...el.com
Cc:     jonathan.lemon@...il.com, bpf@...r.kernel.org,
        anthony.l.nguyen@...el.com
Subject: [PATCH bpf-next 09/13] selftests: xsk: fix socket creation retry

From: Magnus Karlsson <magnus.karlsson@...el.com>

The socket creation retry unnecessarily registered the umem once for
every retry. No reason to do this. It wastes memory and it might lead
to too many pages being locked at some point and the failure of a
test.

Signed-off-by: Magnus Karlsson <magnus.karlsson@...el.com>
---
 tools/testing/selftests/bpf/xdpxceiver.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/tools/testing/selftests/bpf/xdpxceiver.c b/tools/testing/selftests/bpf/xdpxceiver.c
index c5c68b860ae0..aa5660dc0699 100644
--- a/tools/testing/selftests/bpf/xdpxceiver.c
+++ b/tools/testing/selftests/bpf/xdpxceiver.c
@@ -919,18 +919,17 @@ static void thread_common_ops(struct test_spec *test, struct ifobject *ifobject)
 		u64 umem_sz = ifobject->umem->num_frames * ifobject->umem->frame_size;
 		u32 ctr = 0;
 		void *bufs;
+		int ret;
 
 		bufs = mmap(NULL, umem_sz, PROT_READ | PROT_WRITE, mmap_flags, -1, 0);
 		if (bufs == MAP_FAILED)
 			exit_with_error(errno);
 
-		while (ctr++ < SOCK_RECONF_CTR) {
-			int ret;
-
-			ret = xsk_configure_umem(&ifobject->umem_arr[i], bufs, umem_sz);
-			if (ret)
-				exit_with_error(-ret);
+		ret = xsk_configure_umem(&ifobject->umem_arr[i], bufs, umem_sz);
+		if (ret)
+			exit_with_error(-ret);
 
+		while (ctr++ < SOCK_RECONF_CTR) {
 			ret = xsk_configure_socket(&ifobject->xsk_arr[i], &ifobject->umem_arr[i],
 						   ifobject, i);
 			if (!ret)
-- 
2.29.0