[dpdk-dev] [PATCH 6/6] net/sfc: check actual all multicast unknown unicast filters

[Andrew Rybchenko <arybchenko@solarflare.com>]

From: Igor Romanov <igor.romanov@oktetlabs.ru>

Check that unknown unicast and unknown multicast filters are
applied and return an error if they are not applied. The error
is used in promiscuous and all multicast mode enable and disable
callbacks.

Signed-off-by: Igor Romanov <igor.romanov@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
---
 drivers/net/sfc/sfc.h        |  1 +
 drivers/net/sfc/sfc_ethdev.c | 16 +++++++---
 drivers/net/sfc/sfc_port.c   | 62 +++++++++++++++++++++++++++++++++---
 drivers/net/sfc/sfc_rx.c     |  4 +--
 4 files changed, 73 insertions(+), 10 deletions(-)

diff --git a/drivers/net/sfc/sfc.h b/drivers/net/sfc/sfc.h
index 2520cf2b7c..ceb23402a5 100644
--- a/drivers/net/sfc/sfc.h
+++ b/drivers/net/sfc/sfc.h
@@ -407,6 +407,7 @@ void sfc_port_link_mode_to_info(efx_link_mode_t link_mode,
 int sfc_port_update_mac_stats(struct sfc_adapter *sa);
 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);
 
 
 #ifdef __cplusplus
diff --git a/drivers/net/sfc/sfc_ethdev.c b/drivers/net/sfc/sfc_ethdev.c
index f8867b0ec0..de490eb90d 100644
--- a/drivers/net/sfc/sfc_ethdev.c
+++ b/drivers/net/sfc/sfc_ethdev.c
@@ -393,8 +393,16 @@ sfc_dev_filter_set(struct rte_eth_dev *dev, enum sfc_dev_filter_mode mode,
 		} else if ((sa->state == SFC_ADAPTER_STARTED) &&
 			   ((rc = sfc_set_rx_mode(sa)) != 0)) {
 			*toggle = !(enabled);
-			sfc_warn(sa, "Failed to %s %s mode",
-				 ((enabled) ? "enable" : "disable"), desc);
+			sfc_warn(sa, "Failed to %s %s mode, rc = %d",
+				 ((enabled) ? "enable" : "disable"), desc, rc);
+
+			/*
+			 * For promiscuous and all-multicast filters a
+			 * permission failure should be reported as an
+			 * unsupported filter.
+			 */
+			if (rc == EPERM)
+				rc = ENOTSUP;
 		}
 	}
 
@@ -1060,12 +1068,12 @@ sfc_mac_addr_set(struct rte_eth_dev *dev, struct rte_ether_addr *mac_addr)
 		 * has no effect on received traffic, therefore
 		 * we also need to update unicast filters
 		 */
-		rc = sfc_set_rx_mode(sa);
+		rc = sfc_set_rx_mode_unchecked(sa);
 		if (rc != 0) {
 			sfc_err(sa, "cannot set filter (rc = %u)", rc);
 			/* Rollback the old address */
 			(void)efx_mac_addr_set(sa->nic, old_addr->addr_bytes);
-			(void)sfc_set_rx_mode(sa);
+			(void)sfc_set_rx_mode_unchecked(sa);
 		}
 	} else {
 		sfc_warn(sa, "cannot set MAC address with filters installed");
diff --git a/drivers/net/sfc/sfc_port.c b/drivers/net/sfc/sfc_port.c
index 23313e125f..0ddefdefe8 100644
--- a/drivers/net/sfc/sfc_port.c
+++ b/drivers/net/sfc/sfc_port.c
@@ -239,7 +239,7 @@ sfc_port_start(struct sfc_adapter *sa)
 				B_TRUE : B_FALSE;
 		port->allmulti = (sa->eth_dev->data->all_multicast != 0) ?
 				 B_TRUE : B_FALSE;
-		rc = sfc_set_rx_mode(sa);
+		rc = sfc_set_rx_mode_unchecked(sa);
 		if (rc != 0)
 			goto fail_mac_filter_set;
 
@@ -485,16 +485,70 @@ sfc_port_detach(struct sfc_adapter *sa)
 	sfc_log_init(sa, "done");
 }
 
+static boolean_t
+sfc_get_requested_all_ucast(struct sfc_port *port)
+{
+	return port->promisc;
+}
+
+static boolean_t
+sfc_get_requested_all_mcast(struct sfc_port *port)
+{
+	return port->promisc || port->allmulti;
+}
+
+int
+sfc_set_rx_mode_unchecked(struct sfc_adapter *sa)
+{
+	struct sfc_port *port = &sa->port;
+	boolean_t requested_all_ucast = sfc_get_requested_all_ucast(port);
+	boolean_t requested_all_mcast = sfc_get_requested_all_mcast(port);
+	int rc;
+
+	rc = efx_mac_filter_set(sa->nic, requested_all_ucast, B_TRUE,
+				requested_all_mcast, B_TRUE);
+	if (rc != 0)
+		return rc;
+
+	return 0;
+}
+
 int
 sfc_set_rx_mode(struct sfc_adapter *sa)
 {
 	struct sfc_port *port = &sa->port;
+	boolean_t old_all_ucast;
+	boolean_t old_all_mcast;
+	boolean_t requested_all_ucast = sfc_get_requested_all_ucast(port);
+	boolean_t requested_all_mcast = sfc_get_requested_all_mcast(port);
+	boolean_t actual_all_ucast;
+	boolean_t actual_all_mcast;
 	int rc;
 
-	rc = efx_mac_filter_set(sa->nic, port->promisc, B_TRUE,
-				port->promisc || port->allmulti, B_TRUE);
+	efx_mac_filter_get_all_ucast_mcast(sa->nic, &old_all_ucast,
+					   &old_all_mcast);
 
-	return rc;
+	rc = sfc_set_rx_mode_unchecked(sa);
+	if (rc != 0)
+		return rc;
+
+	efx_mac_filter_get_all_ucast_mcast(sa->nic, &actual_all_ucast,
+					   &actual_all_mcast);
+
+	if (actual_all_ucast != requested_all_ucast ||
+	    actual_all_mcast != requested_all_mcast) {
+		/*
+		 * MAC filter set succeeded but not all requested modes
+		 * were applied. The rollback is necessary to bring back the
+		 * consistent old state.
+		 */
+		(void)efx_mac_filter_set(sa->nic, old_all_ucast, B_TRUE,
+					 old_all_mcast, B_TRUE);
+
+		return EPERM;
+	}
+
+	return 0;
 }
 
 void
diff --git a/drivers/net/sfc/sfc_rx.c b/drivers/net/sfc/sfc_rx.c
index 891709fd04..183589c639 100644
--- a/drivers/net/sfc/sfc_rx.c
+++ b/drivers/net/sfc/sfc_rx.c
@@ -720,7 +720,7 @@ sfc_rx_default_rxq_set_filter(struct sfc_adapter *sa, struct sfc_rxq *rxq)
 
 		port->promisc = B_FALSE;
 		sa->eth_dev->data->promiscuous = 0;
-		rc = sfc_set_rx_mode(sa);
+		rc = sfc_set_rx_mode_unchecked(sa);
 		if (rc != 0)
 			return rc;
 
@@ -734,7 +734,7 @@ sfc_rx_default_rxq_set_filter(struct sfc_adapter *sa, struct sfc_rxq *rxq)
 
 		port->allmulti = B_FALSE;
 		sa->eth_dev->data->all_multicast = 0;
-		rc = sfc_set_rx_mode(sa);
+		rc = sfc_set_rx_mode_unchecked(sa);
 		if (rc != 0)
 			return rc;
 
-- 
2.17.1