net: netcp: ethss: k2g: add promiscuous mode support

This patch adds support for promiscuous mode in k2g's network
driver. When upper layer instructs to transition from
non-promiscuous mode to promiscuous mode or vice versa
K2G network driver needs to configure ALE accordingly
so that in case of non-promiscuous mode, ALE will not flood
all unicast packets to host port, while in promiscuous
mode, it will pass all received unicast packets to
host port.

Signed-off-by: WingMan Kwok <w-kwok2@ti.com>
Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/ti/netcp_ethss.c b/drivers/net/ethernet/ti/netcp_ethss.c
index 5bc792175e4e7f4240444e256f5338178d7d4071..6a728d35e7763b49b0dae8cd975c01ff1390930c 100644 (file)
--- a/drivers/net/ethernet/ti/netcp_ethss.c
+++ b/drivers/net/ethernet/ti/netcp_ethss.c
@@ -2775,6 +2775,61 @@ static inline int gbe_hwtstamp_set(struct gbe_intf *gbe_intf, struct ifreq *req)
 }
 #endif /* CONFIG_TI_CPTS */
 
+static int gbe_set_rx_mode(void *intf_priv, bool promisc)
+{
+       struct gbe_intf *gbe_intf = intf_priv;
+       struct gbe_priv *gbe_dev = gbe_intf->gbe_dev;
+       struct cpsw_ale *ale = gbe_dev->ale;
+       unsigned long timeout;
+       int i, ret = -ETIMEDOUT;
+
+       /* Disable(1)/Enable(0) Learn for all ports (host is port 0 and
+        * slaves are port 1 and up
+        */
+       for (i = 0; i <= gbe_dev->num_slaves; i++) {
+               cpsw_ale_control_set(ale, i,
+                                    ALE_PORT_NOLEARN, !!promisc);
+               cpsw_ale_control_set(ale, i,
+                                    ALE_PORT_NO_SA_UPDATE, !!promisc);
+       }
+
+       if (!promisc) {
+               /* Don't Flood All Unicast Packets to Host port */
+               cpsw_ale_control_set(ale, 0, ALE_P0_UNI_FLOOD, 0);
+               dev_vdbg(gbe_dev->dev, "promiscuous mode disabled\n");
+               return 0;
+       }
+
+       timeout = jiffies + HZ;
+
+       /* Clear All Untouched entries */
+       cpsw_ale_control_set(ale, 0, ALE_AGEOUT, 1);
+       do {
+               cpu_relax();
+               if (cpsw_ale_control_get(ale, 0, ALE_AGEOUT)) {
+                       ret = 0;
+                       break;
+               }
+
+       } while (time_after(timeout, jiffies));
+
+       /* Make sure it is not a false timeout */
+       if (ret && !cpsw_ale_control_get(ale, 0, ALE_AGEOUT))
+               return ret;
+
+       cpsw_ale_control_set(ale, 0, ALE_AGEOUT, 1);
+
+       /* Clear all mcast from ALE */
+       cpsw_ale_flush_multicast(ale,
+                                GBE_PORT_MASK(gbe_dev->ale_ports),
+                                -1);
+
+       /* Flood All Unicast Packets to Host port */
+       cpsw_ale_control_set(ale, 0, ALE_P0_UNI_FLOOD, 1);
+       dev_vdbg(gbe_dev->dev, "promiscuous mode enabled\n");
+       return ret;
+}
+
 static int gbe_ioctl(void *intf_priv, struct ifreq *req, int cmd)
 {
        struct gbe_intf *gbe_intf = intf_priv;
@@ -3529,6 +3584,7 @@ static int gbe_probe(struct netcp_device *netcp_device, struct device *dev,
                gbe_dev->max_num_slaves = 8;
        } else if (of_device_is_compatible(node, "ti,netcp-gbe-2")) {
                gbe_dev->max_num_slaves = 1;
+               gbe_module.set_rx_mode = gbe_set_rx_mode;
        } else if (of_device_is_compatible(node, "ti,netcp-xgbe")) {
                gbe_dev->max_num_slaves = 2;
        } else {