Some PMDs deliver the Rx interrupts of several queues through a single shared fd; dpaa2, for instance, uses one QBMan portal per lcore. Registering the fd a second time then returns -EEXIST, which event_register() treated as fatal and disabled interrupt mode for the whole lcore.
Accept -EEXIST as success. NICs with a dedicated fd per queue never return it, so their behaviour is unchanged. Signed-off-by: Maxime Leroy <[email protected]> --- examples/l3fwd-power/main.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/examples/l3fwd-power/main.c b/examples/l3fwd-power/main.c index 4874a55de1..fa64e28e5c 100644 --- a/examples/l3fwd-power/main.c +++ b/examples/l3fwd-power/main.c @@ -937,7 +937,12 @@ static int event_register(struct lcore_conf *qconf) RTE_EPOLL_PER_THREAD, RTE_INTR_EVENT_ADD, (void *)((uintptr_t)data)); - if (ret) + /* + * Queues polled on the same lcore may share one interrupt fd, + * so registering the second onward returns -EEXIST; treat it + * as success. + */ + if (ret && ret != -EEXIST) return ret; } -- 2.43.0
