[PATCH] forcedeth: Add vlan support

This forcedeth patch adds support for vlan stripping/inserting in hardware.

Signed-off-By: Ayaz Abdulla <aabdulla@nvidia.com>

Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 71 insertions, 5 deletions

diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c
index 3682ec61e8a8..0fbe342c2ac9 100644
--- a/drivers/net/forcedeth.c
+++ b/drivers/net/forcedeth.c
@@ -102,6 +102,7 @@
  *      0.47: 26 Oct 2005: Add phyaddr 0 in phy scan.
  *      0.48: 24 Dec 2005: Disable TSO, bugfix for pci_map_single
  *      0.49: 10 Dec 2005: Fix tso for large buffers.
+ *      0.50: 20 Jan 2006: Add 8021pq tagging support.
  *
  * Known bugs:
  * We suspect that on some hardware no TX done interrupts are generated.
@@ -113,7 +114,7 @@
  * DEV_NEED_TIMERIRQ will not harm you on sane hardware, only generating a few
  * superfluous timer interrupts from the nic.
  */
-#define FORCEDETH_VERSION               "0.49"
+#define FORCEDETH_VERSION               "0.50"
 #define DRV_NAME                        "forcedeth"
 
 #include <linux/module.h>
@@ -153,6 +154,7 @@
 #define DEV_HAS_LARGEDESC       0x0004  /* device supports jumbo frames and needs packet format 2 */
 #define DEV_HAS_HIGH_DMA        0x0008  /* device supports 64bit dma */
 #define DEV_HAS_CHECKSUM        0x0010  /* device supports tx and rx checksum offloads */
+#define DEV_HAS_VLAN            0x0020  /* device supports vlan tagging and striping */
 
 enum {
         NvRegIrqStatus = 0x000,
@@ -254,6 +256,8 @@ enum {
 #define NVREG_TXRXCTL_DESC_1    0
 #define NVREG_TXRXCTL_DESC_2    0x02100
 #define NVREG_TXRXCTL_DESC_3    0x02200
+#define NVREG_TXRXCTL_VLANSTRIP 0x00040
+#define NVREG_TXRXCTL_VLANINS   0x00080
         NvRegMIIStatus = 0x180,
 #define NVREG_MIISTAT_ERROR             0x0001
 #define NVREG_MIISTAT_LINKCHANGE        0x0008
@@ -303,6 +307,8 @@ enum {
 #define NVREG_POWERSTATE_D1             0x0001
 #define NVREG_POWERSTATE_D2             0x0002
 #define NVREG_POWERSTATE_D3             0x0003
+        NvRegVlanControl = 0x300,
+#define NVREG_VLANCONTROL_ENABLE        0x2000
 };
 
 /* Big endian: should work, but is untested */
@@ -314,7 +320,7 @@ struct ring_desc {
 struct ring_desc_ex {
         u32 PacketBufferHigh;
         u32 PacketBufferLow;
-        u32 Reserved;
+        u32 TxVlan;
         u32 FlagLen;
 };
 
@@ -355,6 +361,8 @@ typedef union _ring_type {
 #define NV_TX2_CHECKSUM_L3      (1<<27)
 #define NV_TX2_CHECKSUM_L4      (1<<26)
 
+#define NV_TX3_VLAN_TAG_PRESENT (1<<18)
+
 #define NV_RX_DESCRIPTORVALID   (1<<16)
 #define NV_RX_MISSEDFRAME       (1<<17)
 #define NV_RX_SUBSTRACT1        (1<<18)
@@ -385,6 +393,9 @@ typedef union _ring_type {
 #define NV_RX2_ERROR            (1<<30)
 #define NV_RX2_AVAIL            (1<<31)
 
+#define NV_RX3_VLAN_TAG_PRESENT (1<<16)
+#define NV_RX3_VLAN_TAG_MASK    (0x0000FFFF)
+
 /* Miscelaneous hardware related defines: */
 #define NV_PCI_REGSZ            0x270
 
@@ -511,6 +522,7 @@ struct fe_priv {
         u32 irqmask;
         u32 desc_ver;
         u32 txrxctl_bits;
+        u32 vlanctl_bits;
 
         void __iomem *base;
 
@@ -540,6 +552,9 @@ struct fe_priv {
         dma_addr_t tx_dma[TX_RING];
         unsigned int tx_dma_len[TX_RING];
         u32 tx_flags;
+
+        /* vlan fields */
+        struct vlan_group *vlangrp;
 };
 
 /*
@@ -1031,6 +1046,7 @@ static int nv_start_xmit(struct sk_buff *skb, struct net_device *dev)
         u32 bcnt;
         u32 size = skb->len-skb->data_len;
         u32 entries = (size >> NV_TX2_TSO_MAX_SHIFT) + ((size & (NV_TX2_TSO_MAX_SIZE-1)) ? 1 : 0);
+        u32 tx_flags_vlan = 0;
 
         /* add fragments to entries count */
         for (i = 0; i < fragments; i++) {
@@ -1111,10 +1127,16 @@ static int nv_start_xmit(struct sk_buff *skb, struct net_device *dev)
 #endif
         tx_flags_extra = (skb->ip_summed == CHECKSUM_HW ? (NV_TX2_CHECKSUM_L3|NV_TX2_CHECKSUM_L4) : 0);
 
+        /* vlan tag */
+        if (np->vlangrp && vlan_tx_tag_present(skb)) {
+                tx_flags_vlan = NV_TX3_VLAN_TAG_PRESENT | vlan_tx_tag_get(skb);
+        }
+
         /* set tx flags */
         if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2) {
                 np->tx_ring.orig[start_nr].FlagLen |= cpu_to_le32(tx_flags | tx_flags_extra);
         } else {
+                np->tx_ring.ex[start_nr].TxVlan = cpu_to_le32(tx_flags_vlan);
                 np->tx_ring.ex[start_nr].FlagLen |= cpu_to_le32(tx_flags | tx_flags_extra);
         }       
 
@@ -1342,6 +1364,8 @@ static void nv_rx_process(struct net_device *dev)
 {
         struct fe_priv *np = netdev_priv(dev);
         u32 Flags;
+        u32 vlanflags = 0;
+
 
         for (;;) {
                 struct sk_buff *skb;
@@ -1357,6 +1381,7 @@ static void nv_rx_process(struct net_device *dev)
                 } else {
                         Flags = le32_to_cpu(np->rx_ring.ex[i].FlagLen);
                         len = nv_descr_getlength_ex(&np->rx_ring.ex[i], np->desc_ver);
+                        vlanflags = le32_to_cpu(np->rx_ring.ex[i].PacketBufferLow);
                 }
 
                 dprintk(KERN_DEBUG "%s: nv_rx_process: looking at packet %d, Flags 0x%x.\n",
@@ -1474,7 +1499,11 @@ static void nv_rx_process(struct net_device *dev)
                 skb->protocol = eth_type_trans(skb, dev);
                 dprintk(KERN_DEBUG "%s: nv_rx_process: packet %d with %d bytes, proto %d accepted.\n",
                                         dev->name, np->cur_rx, len, skb->protocol);
-                netif_rx(skb);
+                if (np->vlangrp && (vlanflags & NV_RX3_VLAN_TAG_PRESENT)) {
+                        vlan_hwaccel_rx(skb, np->vlangrp, vlanflags & NV_RX3_VLAN_TAG_MASK);
+                } else {
+                        netif_rx(skb);
+                }
                 dev->last_rx = jiffies;
                 np->stats.rx_packets++;
                 np->stats.rx_bytes += len;
@@ -2217,6 +2246,34 @@ static struct ethtool_ops ops = {
         .get_perm_addr = ethtool_op_get_perm_addr,
 };
 
+static void nv_vlan_rx_register(struct net_device *dev, struct vlan_group *grp)
+{
+        struct fe_priv *np = get_nvpriv(dev);
+
+        spin_lock_irq(&np->lock);
+
+        /* save vlan group */
+        np->vlangrp = grp;
+
+        if (grp) {
+                /* enable vlan on MAC */
+                np->txrxctl_bits |= NVREG_TXRXCTL_VLANSTRIP | NVREG_TXRXCTL_VLANINS;
+        } else {
+                /* disable vlan on MAC */
+                np->txrxctl_bits &= ~NVREG_TXRXCTL_VLANSTRIP;
+                np->txrxctl_bits &= ~NVREG_TXRXCTL_VLANINS;
+        }
+
+        writel(np->txrxctl_bits, get_hwbase(dev) + NvRegTxRxControl);
+
+        spin_unlock_irq(&np->lock);
+};
+
+static void nv_vlan_rx_kill_vid(struct net_device *dev, unsigned short vid)
+{
+        /* nothing to do */
+};
+
 static int nv_open(struct net_device *dev)
 {
         struct fe_priv *np = netdev_priv(dev);
@@ -2265,6 +2322,7 @@ static int nv_open(struct net_device *dev)
         writel(np->linkspeed, base + NvRegLinkSpeed);
         writel(NVREG_UNKSETUP3_VAL1, base + NvRegUnknownSetupReg3);
         writel(np->txrxctl_bits, base + NvRegTxRxControl);
+        writel(np->vlanctl_bits, base + NvRegVlanControl);
         pci_push(base);
         writel(NVREG_TXRXCTL_BIT1|np->txrxctl_bits, base + NvRegTxRxControl);
         reg_delay(dev, NvRegUnknownSetupReg5, NVREG_UNKSETUP5_BIT31, NVREG_UNKSETUP5_BIT31,
@@ -2496,6 +2554,14 @@ static int __devinit nv_probe(struct pci_dev *pci_dev, const struct pci_device_i
 #endif
         }
 
+        np->vlanctl_bits = 0;
+        if (id->driver_data & DEV_HAS_VLAN) {
+                np->vlanctl_bits = NVREG_VLANCONTROL_ENABLE;
+                dev->features |= NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX;
+                dev->vlan_rx_register = nv_vlan_rx_register;
+                dev->vlan_rx_kill_vid = nv_vlan_rx_kill_vid;
+        }
+
         err = -ENOMEM;
         np->base = ioremap(addr, NV_PCI_REGSZ);
         if (!np->base)
@@ -2737,11 +2803,11 @@ static struct pci_device_id pci_tbl[] = {
         },
         {       /* MCP55 Ethernet Controller */
                 PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NVENET_14),
-                .driver_data = DEV_NEED_TIMERIRQ|DEV_NEED_LINKTIMER|DEV_HAS_LARGEDESC|DEV_HAS_CHECKSUM|DEV_HAS_HIGH_DMA,
+                .driver_data = DEV_NEED_TIMERIRQ|DEV_NEED_LINKTIMER|DEV_HAS_LARGEDESC|DEV_HAS_CHECKSUM|DEV_HAS_HIGH_DMA|DEV_HAS_VLAN,
         },
         {       /* MCP55 Ethernet Controller */
                 PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NVENET_15),
-                .driver_data = DEV_NEED_TIMERIRQ|DEV_NEED_LINKTIMER|DEV_HAS_LARGEDESC|DEV_HAS_CHECKSUM|DEV_HAS_HIGH_DMA,
+                .driver_data = DEV_NEED_TIMERIRQ|DEV_NEED_LINKTIMER|DEV_HAS_LARGEDESC|DEV_HAS_CHECKSUM|DEV_HAS_HIGH_DMA|DEV_HAS_VLAN,
         },
         {0,},
 };