+/*
+ * Unregister callback handler safely. The handler may be active
+ * while we are trying to unregister it, in this case code -EAGAIN
+ * is returned by rte_intr_callback_unregister(). This routine checks
+ * the return code and tries to unregister handler again.
+ *
+ * @param handle
+ * interrupt handle
+ * @param cb_fn
+ * pointer to callback routine
+ * @cb_arg
+ * opaque callback parameter
+ */
+void
+mlx5_intr_callback_unregister(const struct rte_intr_handle *handle,
+ rte_intr_callback_fn cb_fn, void *cb_arg)
+{
+ /*
+ * Try to reduce timeout management overhead by not calling
+ * the timer related routines on the first iteration. If the
+ * unregistering succeeds on first call there will be no
+ * timer calls at all.
+ */
+ uint64_t twait = 0;
+ uint64_t start = 0;
+
+ do {
+ int ret;
+
+ ret = rte_intr_callback_unregister(handle, cb_fn, cb_arg);
+ if (ret >= 0)
+ return;
+ if (ret != -EAGAIN) {
+ DRV_LOG(INFO, "failed to unregister interrupt"
+ " handler (error: %d)", ret);
+ MLX5_ASSERT(false);
+ return;
+ }
+ if (twait) {
+ struct timespec onems;
+
+ /* Wait one millisecond and try again. */
+ onems.tv_sec = 0;
+ onems.tv_nsec = NS_PER_S / MS_PER_S;
+ nanosleep(&onems, 0);
+ /* Check whether one second elapsed. */
+ if ((rte_get_timer_cycles() - start) <= twait)
+ continue;
+ } else {
+ /*
+ * We get the amount of timer ticks for one second.
+ * If this amount elapsed it means we spent one
+ * second in waiting. This branch is executed once
+ * on first iteration.
+ */
+ twait = rte_get_timer_hz();
+ MLX5_ASSERT(twait);
+ }
+ /*
+ * Timeout elapsed, show message (once a second) and retry.
+ * We have no other acceptable option here, if we ignore
+ * the unregistering return code the handler will not
+ * be unregistered, fd will be closed and we may get the
+ * crush. Hanging and messaging in the loop seems not to be
+ * the worst choice.
+ */
+ DRV_LOG(INFO, "Retrying to unregister interrupt handler");
+ start = rte_get_timer_cycles();
+ } while (true);
+}
+
+/**
+ * Handle DEVX interrupts from the NIC.
+ * This function is probably called from the DPDK host thread.
+ *
+ * @param cb_arg
+ * Callback argument.
+ */
+void
+mlx5_dev_interrupt_handler_devx(void *cb_arg)
+{
+#ifndef HAVE_IBV_DEVX_ASYNC
+ (void)cb_arg;
+ return;
+#else
+ struct mlx5_ibv_shared *sh = cb_arg;
+ union {
+ struct mlx5dv_devx_async_cmd_hdr cmd_resp;
+ uint8_t buf[MLX5_ST_SZ_BYTES(query_flow_counter_out) +
+ MLX5_ST_SZ_BYTES(traffic_counter) +
+ sizeof(struct mlx5dv_devx_async_cmd_hdr)];
+ } out;
+ uint8_t *buf = out.buf + sizeof(out.cmd_resp);
+
+ while (!mlx5_glue->devx_get_async_cmd_comp(sh->devx_comp,
+ &out.cmd_resp,
+ sizeof(out.buf)))
+ mlx5_flow_async_pool_query_handle
+ (sh, (uint64_t)out.cmd_resp.wr_id,
+ mlx5_devx_get_out_command_status(buf));
+#endif /* HAVE_IBV_DEVX_ASYNC */
+}
+