[PATCH v2 4/5] net/nfb: fix multicast/promiscuous mode switching

[spinler@cesnet.cz]

From: Martin Spinler <spinler@cesnet.cz>

In the firmware, the promisc mode overrides the multicast mode.
So when the promisc mode is turned off, driver must check if the
multicast mode was active before and conditionally reactivate it.

Fixes: 6435f9a0ac22 ("net/nfb: add new netcope driver")
Cc: cernay@netcope.com
Cc: stable@dpdk.org
Signed-off-by: Martin Spinler <spinler@cesnet.cz>
---
 drivers/net/nfb/nfb.h        |  4 ----
 drivers/net/nfb/nfb_ethdev.c |  1 -
 drivers/net/nfb/nfb_rxmode.c | 20 ++++++++------------
 3 files changed, 8 insertions(+), 17 deletions(-)

diff --git a/drivers/net/nfb/nfb.h b/drivers/net/nfb/nfb.h
index 4de9006ac0..7dc5bd29e4 100644
--- a/drivers/net/nfb/nfb.h
+++ b/drivers/net/nfb/nfb.h
@@ -47,10 +47,6 @@ struct pmd_internals {
 
 	char             nfb_dev[PATH_MAX];
 	struct nfb_device *nfb;
-	/* Place to remember if filter was promiscuous or filtering by table,
-	 * when disabling allmulticast
-	 */
-	enum nc_rxmac_mac_filter rx_filter_original;
 };
 
 #endif /* _NFB_H_ */
diff --git a/drivers/net/nfb/nfb_ethdev.c b/drivers/net/nfb/nfb_ethdev.c
index 53a98642b3..5d503e131a 100644
--- a/drivers/net/nfb/nfb_ethdev.c
+++ b/drivers/net/nfb/nfb_ethdev.c
@@ -534,7 +534,6 @@ nfb_eth_dev_init(struct rte_eth_dev *dev)
 
 	data->promiscuous = nfb_eth_promiscuous_get(dev);
 	data->all_multicast = nfb_eth_allmulticast_get(dev);
-	internals->rx_filter_original = data->promiscuous;
 
 	dev->data->dev_flags |= RTE_ETH_DEV_AUTOFILL_QUEUE_XSTATS;
 
diff --git a/drivers/net/nfb/nfb_rxmode.c b/drivers/net/nfb/nfb_rxmode.c
index 2d0b613d21..ca6e4d5578 100644
--- a/drivers/net/nfb/nfb_rxmode.c
+++ b/drivers/net/nfb/nfb_rxmode.c
@@ -14,8 +14,6 @@ nfb_eth_promiscuous_enable(struct rte_eth_dev *dev)
 		dev->data->dev_private;
 	uint16_t i;
 
-	internals->rx_filter_original = RXMAC_MAC_FILTER_PROMISCUOUS;
-
 	for (i = 0; i < internals->max_rxmac; ++i) {
 		nc_rxmac_mac_filter_enable(internals->rxmac[i],
 			RXMAC_MAC_FILTER_PROMISCUOUS);
@@ -30,16 +28,13 @@ nfb_eth_promiscuous_disable(struct rte_eth_dev *dev)
 	struct pmd_internals *internals = (struct pmd_internals *)
 		dev->data->dev_private;
 	uint16_t i;
+	enum nc_rxmac_mac_filter filter = RXMAC_MAC_FILTER_TABLE_BCAST;
 
-	internals->rx_filter_original = RXMAC_MAC_FILTER_TABLE;
-
-	/* if promisc is not enabled, do nothing */
-	if (!nfb_eth_promiscuous_get(dev))
-		return 0;
+	if (dev->data->all_multicast)
+		filter = RXMAC_MAC_FILTER_TABLE_BCAST_MCAST;
 
 	for (i = 0; i < internals->max_rxmac; ++i) {
-		nc_rxmac_mac_filter_enable(internals->rxmac[i],
-			RXMAC_MAC_FILTER_TABLE);
+		nc_rxmac_mac_filter_enable(internals->rxmac[i], filter);
 	}
 
 	return 0;
@@ -67,6 +62,8 @@ nfb_eth_allmulticast_enable(struct rte_eth_dev *dev)
 		dev->data->dev_private;
 
 	uint16_t i;
+	if (dev->data->promiscuous)
+		return 0;
 	for (i = 0; i < internals->max_rxmac; ++i) {
 		nc_rxmac_mac_filter_enable(internals->rxmac[i],
 			RXMAC_MAC_FILTER_TABLE_BCAST_MCAST);
@@ -83,13 +80,12 @@ nfb_eth_allmulticast_disable(struct rte_eth_dev *dev)
 
 	uint16_t i;
 
-	/* if multicast is not enabled do nothing */
-	if (!nfb_eth_allmulticast_get(dev))
+	if (dev->data->promiscuous)
 		return 0;
 
 	for (i = 0; i < internals->max_rxmac; ++i) {
 		nc_rxmac_mac_filter_enable(internals->rxmac[i],
-			internals->rx_filter_original);
+			RXMAC_MAC_FILTER_TABLE_BCAST);
 	}
 
 	return 0;
-- 
2.35.1