Index: head/sys/dev/sfxge/common/ef10_impl.h
===================================================================
--- head/sys/dev/sfxge/common/ef10_impl.h
+++ head/sys/dev/sfxge/common/ef10_impl.h
@@ -330,6 +330,12 @@
 	__in		efx_mcdi_feature_id_t id,
 	__out		boolean_t *supportedp);
 
+extern			void
+ef10_mcdi_get_timeout(
+	__in		efx_nic_t *enp,
+	__in		efx_mcdi_req_t *emrp,
+	__out		uint32_t *timeoutp);
+
 #endif /* EFSYS_OPT_MCDI */
 
 /* NVRAM */
Index: head/sys/dev/sfxge/common/ef10_mcdi.c
===================================================================
--- head/sys/dev/sfxge/common/ef10_mcdi.c
+++ head/sys/dev/sfxge/common/ef10_mcdi.c
@@ -108,6 +108,46 @@
 	emip->emi_new_epoch = B_FALSE;
 }
 
+/*
+ * In older firmware all commands are processed in a single thread, so a long
+ * running command for one PCIe function can block processing for another
+ * function (see bug 61269).
+ *
+ * In newer firmware that supports multithreaded MCDI processing, we can extend
+ * the timeout for long-running requests which we know firmware may choose to
+ * process in a background thread.
+ */
+#define	EF10_MCDI_CMD_TIMEOUT_US	(10 * 1000 * 1000)
+#define	EF10_MCDI_CMD_LONG_TIMEOUT_US	(60 * 1000 * 1000)
+
+			void
+ef10_mcdi_get_timeout(
+	__in		efx_nic_t *enp,
+	__in		efx_mcdi_req_t *emrp,
+	__out		uint32_t *timeoutp)
+{
+	efx_nic_cfg_t *encp = &(enp->en_nic_cfg);
+
+	switch (emrp->emr_cmd) {
+	case MC_CMD_POLL_BIST:
+	case MC_CMD_NVRAM_ERASE:
+	case MC_CMD_LICENSING_V3:
+	case MC_CMD_NVRAM_UPDATE_FINISH:
+		if (encp->enc_fw_verified_nvram_update_required != B_FALSE) {
+			/*
+			 * Potentially longer running commands, which firmware
+			 * may choose to process in a background thread.
+			 */
+			*timeoutp = EF10_MCDI_CMD_LONG_TIMEOUT_US;
+			break;
+		}
+		/* FALLTHRU */
+	default:
+		*timeoutp = EF10_MCDI_CMD_TIMEOUT_US;
+		break;
+	}
+}
+
 			void
 ef10_mcdi_send_request(
 	__in			efx_nic_t *enp,
Index: head/sys/dev/sfxge/common/efx.h
===================================================================
--- head/sys/dev/sfxge/common/efx.h
+++ head/sys/dev/sfxge/common/efx.h
@@ -243,6 +243,12 @@
 	__in		efx_nic_t *enp);
 
 extern			void
+efx_mcdi_get_timeout(
+	__in		efx_nic_t *enp,
+	__in		efx_mcdi_req_t *emrp,
+	__out		uint32_t *usec_timeoutp);
+
+extern			void
 efx_mcdi_request_start(
 	__in		efx_nic_t *enp,
 	__in		efx_mcdi_req_t *emrp,
Index: head/sys/dev/sfxge/common/efx_impl.h
===================================================================
--- head/sys/dev/sfxge/common/efx_impl.h
+++ head/sys/dev/sfxge/common/efx_impl.h
@@ -427,7 +427,10 @@
 	boolean_t	(*emco_poll_response)(efx_nic_t *);
 	void		(*emco_read_response)(efx_nic_t *, void *, size_t, size_t);
 	void		(*emco_fini)(efx_nic_t *);
-	efx_rc_t	(*emco_feature_supported)(efx_nic_t *, efx_mcdi_feature_id_t, boolean_t *);
+	efx_rc_t	(*emco_feature_supported)(efx_nic_t *,
+					    efx_mcdi_feature_id_t, boolean_t *);
+	void		(*emco_get_timeout)(efx_nic_t *, efx_mcdi_req_t *,
+					    uint32_t *);
 } efx_mcdi_ops_t;
 
 typedef struct efx_mcdi_s {
Index: head/sys/dev/sfxge/common/efx_mcdi.c
===================================================================
--- head/sys/dev/sfxge/common/efx_mcdi.c
+++ head/sys/dev/sfxge/common/efx_mcdi.c
@@ -67,6 +67,7 @@
 	siena_mcdi_read_response,	/* emco_read_response */
 	siena_mcdi_fini,		/* emco_fini */
 	siena_mcdi_feature_supported,	/* emco_feature_supported */
+	siena_mcdi_get_timeout,		/* emco_get_timeout */
 };
 
 #endif	/* EFSYS_OPT_SIENA */
@@ -81,6 +82,7 @@
 	ef10_mcdi_read_response,	/* emco_read_response */
 	ef10_mcdi_fini,			/* emco_fini */
 	ef10_mcdi_feature_supported,	/* emco_feature_supported */
+	ef10_mcdi_get_timeout,		/* emco_get_timeout */
 };
 
 #endif	/* EFSYS_OPT_HUNTINGTON || EFSYS_OPT_MEDFORD */
@@ -605,6 +607,17 @@
 	return (aborted);
 }
 
+			void
+efx_mcdi_get_timeout(
+	__in		efx_nic_t *enp,
+	__in		efx_mcdi_req_t *emrp,
+	__out		uint32_t *timeoutp)
+{
+	const efx_mcdi_ops_t *emcop = enp->en_mcdi.em_emcop;
+
+	emcop->emco_get_timeout(enp, emrp, timeoutp);
+}
+
 	__checkReturn	efx_rc_t
 efx_mcdi_request_errcode(
 	__in		unsigned int err)
Index: head/sys/dev/sfxge/common/siena_impl.h
===================================================================
--- head/sys/dev/sfxge/common/siena_impl.h
+++ head/sys/dev/sfxge/common/siena_impl.h
@@ -127,6 +127,12 @@
 	__in		efx_mcdi_feature_id_t id,
 	__out		boolean_t *supportedp);
 
+extern			void
+siena_mcdi_get_timeout(
+	__in		efx_nic_t *enp,
+	__in		efx_mcdi_req_t *emrp,
+	__out		uint32_t *timeoutp);
+
 #endif /* EFSYS_OPT_MCDI */
 
 #if EFSYS_OPT_NVRAM || EFSYS_OPT_VPD
Index: head/sys/dev/sfxge/common/siena_mcdi.c
===================================================================
--- head/sys/dev/sfxge/common/siena_mcdi.c
+++ head/sys/dev/sfxge/common/siena_mcdi.c
@@ -247,4 +247,19 @@
 	return (rc);
 }
 
+/* Default timeout for MCDI command processing. */
+#define	SIENA_MCDI_CMD_TIMEOUT_US	(10 * 1000 * 1000)
+
+			void
+siena_mcdi_get_timeout(
+	__in		efx_nic_t *enp,
+	__in		efx_mcdi_req_t *emrp,
+	__out		uint32_t *timeoutp)
+{
+	_NOTE(ARGUNUSED(enp, emrp))
+
+	*timeoutp = SIENA_MCDI_CMD_TIMEOUT_US;
+}
+
+
 #endif	/* EFSYS_OPT_SIENA && EFSYS_OPT_MCDI */