diff options
authorMagnus Karlsson <magnus.karlsson@intel.com>2020-12-10 17:34:07 +0100
committerDaniel Borkmann <daniel@iogearbox.net>2020-12-10 23:13:43 +0100
commit092fde0f863b72b67c4d6dc03844f5658fc00a35 (patch)
parent41003dd0241c2ceb2461a88a18ff461795f2af57 (diff)
samples/bpf: Fix possible hang in xdpsock with multiple threads
Fix a possible hang in xdpsock that can occur when using multiple threads. In this case, one or more of the threads might get stuck in the while-loop in tx_only after the user has signaled the main thread to stop execution. In this case, no more Tx packets will be sent, so a thread might get stuck in the aforementioned while-loop. Fix this by introducing a test inside the while-loop to check if the benchmark has been terminated. If so, return from the function. Fixes: cd9e72b6f210 ("samples/bpf: xdpsock: Add option to specify batch size") Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20201210163407.22066-1-magnus.karlsson@gmail.com
1 files changed, 2 insertions, 0 deletions
diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c
index 568f9815bb1b..db0cb73513a5 100644
--- a/samples/bpf/xdpsock_user.c
+++ b/samples/bpf/xdpsock_user.c
@@ -1275,6 +1275,8 @@ static void tx_only(struct xsk_socket_info *xsk, u32 *frame_nb, int batch_size)
while (xsk_ring_prod__reserve(&xsk->tx, batch_size, &idx) <
batch_size) {
complete_tx_only(xsk, batch_size);
+ if (benchmark_done)
+ return;
for (i = 0; i < batch_size; i++) {

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