net/sfc: fix MAC stats update for stopped device

[ upstream commit 1827b07 ]

Return the latest stats snapshot in stopped state
instead of returning an error.

Fixes: 1caab2f ("net/sfc: add basic statistics")

Signed-off-by: Ivan Ilchenko <ivan.ilchenko@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
Reviewed-by: Andy Moreton <amoreton@xilinx.com>

drivers/net/sfc/sfc.h

@@ -399,7 +399,7 @@ int sfc_port_start(struct sfc_adapter *sa);
 void sfc_port_stop(struct sfc_adapter *sa);
 void sfc_port_link_mode_to_info(efx_link_mode_t link_mode,
 				struct rte_eth_link *link_info);
-int sfc_port_update_mac_stats(struct sfc_adapter *sa);
+int sfc_port_update_mac_stats(struct sfc_adapter *sa, boolean_t manual_update);
 int sfc_port_reset_mac_stats(struct sfc_adapter *sa);
 int sfc_set_rx_mode(struct sfc_adapter *sa);
 int sfc_set_rx_mode_unchecked(struct sfc_adapter *sa);

drivers/net/sfc/sfc_ethdev.c

@@ -606,7 +606,7 @@ sfc_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
 
 	sfc_adapter_lock(sa);
 
-	ret = sfc_port_update_mac_stats(sa);
+	ret = sfc_port_update_mac_stats(sa, B_FALSE);
 	if (ret != 0)
 		goto unlock;
 
@@ -724,7 +724,7 @@ sfc_xstats_get(struct rte_eth_dev *dev, struct rte_eth_xstat *xstats,
 
 	sfc_adapter_lock(sa);
 
-	rc = sfc_port_update_mac_stats(sa);
+	rc = sfc_port_update_mac_stats(sa, B_FALSE);
 	if (rc != 0) {
 		SFC_ASSERT(rc > 0);
 		nstats = -rc;
@@ -788,7 +788,7 @@ sfc_xstats_get_by_id(struct rte_eth_dev *dev, const uint64_t *ids,
 
 	sfc_adapter_lock(sa);
 
-	rc = sfc_port_update_mac_stats(sa);
+	rc = sfc_port_update_mac_stats(sa, B_FALSE);
 	if (rc != 0) {
 		SFC_ASSERT(rc > 0);
 		ret = -rc;

drivers/net/sfc/sfc_port.c

@@ -26,15 +26,16 @@
 /**
  * Update MAC statistics in the buffer.
  *
- * @param	sa	Adapter
+ * @param	sa		Adapter
+ * @param	force_upload	Flag to upload MAC stats in any case
  *
  * @return Status code
  * @retval	0	Success
  * @retval	EAGAIN	Try again
  * @retval	ENOMEM	Memory allocation failure
  */
 int
-sfc_port_update_mac_stats(struct sfc_adapter *sa)
+sfc_port_update_mac_stats(struct sfc_adapter *sa, boolean_t force_upload)
 {
 	struct sfc_port *port = &sa->port;
 	efsys_mem_t *esmp = &port->mac_stats_dma_mem;
@@ -46,14 +47,14 @@ sfc_port_update_mac_stats(struct sfc_adapter *sa)
 	SFC_ASSERT(sfc_adapter_is_locked(sa));
 
 	if (sa->state != SFC_ADAPTER_STARTED)
-		return EINVAL;
+		return 0;
 
 	/*
 	 * If periodic statistics DMA'ing is off or if not supported,
 	 * make a manual request and keep an eye on timer if need be
 	 */
 	if (!port->mac_stats_periodic_dma_supported ||
-	    (port->mac_stats_update_period_ms == 0)) {
+	    (port->mac_stats_update_period_ms == 0) || force_upload) {
 		if (port->mac_stats_update_period_ms != 0) {
 			uint64_t timestamp = sfc_get_system_msecs();
 
@@ -367,6 +368,8 @@ sfc_port_stop(struct sfc_adapter *sa)
 	(void)efx_mac_stats_periodic(sa->nic, &sa->port.mac_stats_dma_mem,
 				     0, B_FALSE);
 
+	sfc_port_update_mac_stats(sa, B_TRUE);
+
 	efx_port_fini(sa->nic);
 	efx_filter_fini(sa->nic);