+static __checkReturn efx_rc_t
+ef10_upstream_port_vadaptor_alloc(
+ __in efx_nic_t *enp)
+{
+ uint32_t retry;
+ uint32_t delay_us;
+ efx_rc_t rc;
+
+ /*
+ * On a VF, this may fail with MC_CMD_ERR_NO_EVB_PORT (ENOENT) if the PF
+ * driver has yet to bring up the EVB port. See bug 56147. In this case,
+ * retry the request several times after waiting a while. The wait time
+ * between retries starts small (10ms) and exponentially increases.
+ * Total wait time is a little over two seconds. Retry logic in the
+ * client driver may mean this whole loop is repeated if it continues to
+ * fail.
+ */
+ retry = 0;
+ delay_us = 10000;
+ while ((rc = efx_mcdi_vadaptor_alloc(enp, EVB_PORT_ID_ASSIGNED)) != 0) {
+ if (EFX_PCI_FUNCTION_IS_PF(&enp->en_nic_cfg) ||
+ (rc != ENOENT)) {
+ /*
+ * Do not retry alloc for PF, or for other errors on
+ * a VF.
+ */
+ goto fail1;
+ }
+
+ /* VF startup before PF is ready. Retry allocation. */
+ if (retry > 5) {
+ /* Too many attempts */
+ rc = EINVAL;
+ goto fail2;
+ }
+ EFSYS_PROBE1(mcdi_no_evb_port_retry, int, retry);
+ EFSYS_SLEEP(delay_us);
+ retry++;
+ if (delay_us < 500000)
+ delay_us <<= 2;
+ }
+
+ return (0);
+
+fail2:
+ EFSYS_PROBE(fail2);
+fail1:
+ EFSYS_PROBE1(fail1, efx_rc_t, rc);
+
+ return (rc);
+}
+