net: sh_eth: add support for VLAN tag filtering
Some controllers have TSU. It can register one VLAN tag, and it can
filter other VLAN tag by hardware.
If vlan_rx_add_vid() is called twice or more, the driver will disable
the filtering.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index 99d8ce8..8615961 100644
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -1888,6 +1888,62 @@
spin_unlock_irqrestore(&mdp->lock, flags);
}
+
+static int sh_eth_get_vtag_index(struct sh_eth_private *mdp)
+{
+ if (!mdp->port)
+ return TSU_VTAG0;
+ else
+ return TSU_VTAG1;
+}
+
+static int sh_eth_vlan_rx_add_vid(struct net_device *ndev, u16 vid)
+{
+ struct sh_eth_private *mdp = netdev_priv(ndev);
+ int vtag_reg_index = sh_eth_get_vtag_index(mdp);
+
+ if (unlikely(!mdp->cd->tsu))
+ return -EPERM;
+
+ /* No filtering if vid = 0 */
+ if (!vid)
+ return 0;
+
+ mdp->vlan_num_ids++;
+
+ /*
+ * The controller has one VLAN tag HW filter. So, if the filter is
+ * already enabled, the driver disables it and the filte
+ */
+ if (mdp->vlan_num_ids > 1) {
+ /* disable VLAN filter */
+ sh_eth_tsu_write(mdp, 0, vtag_reg_index);
+ return 0;
+ }
+
+ sh_eth_tsu_write(mdp, TSU_VTAG_ENABLE | (vid & TSU_VTAG_VID_MASK),
+ vtag_reg_index);
+
+ return 0;
+}
+
+static int sh_eth_vlan_rx_kill_vid(struct net_device *ndev, u16 vid)
+{
+ struct sh_eth_private *mdp = netdev_priv(ndev);
+ int vtag_reg_index = sh_eth_get_vtag_index(mdp);
+
+ if (unlikely(!mdp->cd->tsu))
+ return -EPERM;
+
+ /* No filtering if vid = 0 */
+ if (!vid)
+ return 0;
+
+ mdp->vlan_num_ids--;
+ sh_eth_tsu_write(mdp, 0, vtag_reg_index);
+
+ return 0;
+}
#endif /* SH_ETH_HAS_TSU */
/* SuperH's TSU register init function */
@@ -2037,6 +2093,8 @@
.ndo_get_stats = sh_eth_get_stats,
#if defined(SH_ETH_HAS_TSU)
.ndo_set_rx_mode = sh_eth_set_multicast_list,
+ .ndo_vlan_rx_add_vid = sh_eth_vlan_rx_add_vid,
+ .ndo_vlan_rx_kill_vid = sh_eth_vlan_rx_kill_vid,
#endif
.ndo_tx_timeout = sh_eth_tx_timeout,
.ndo_do_ioctl = sh_eth_do_ioctl,
@@ -2141,6 +2199,7 @@
mdp->tsu_addr = ioremap(rtsu->start,
resource_size(rtsu));
mdp->port = devno % 2;
+ ndev->features = NETIF_F_HW_VLAN_FILTER;
}
/* initialize first or needed device */