[PATCH] sky2: add hardware VLAN acceleration support

Use the hardware to do VLAN.
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

2 files changed, 93 insertions, 14 deletions

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 8527a49e3ff7..6d9c1db8896e 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -26,7 +26,6 @@
 /*
  * TODO
  *      - coalescing setting?
- *      - vlan support
  *
  * TOTEST
  *      - variable ring size
@@ -48,9 +47,14 @@
 #include <linux/tcp.h>
 #include <linux/in.h>
 #include <linux/delay.h>
+#include <linux/if_vlan.h>
 
 #include <asm/irq.h>
 
+#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
+#define SKY2_VLAN_TAG_USED 1
+#endif
+
 #include "sky2.h"
 
 #define DRV_NAME                "sky2"
@@ -489,7 +493,7 @@ static void sky2_mac_init(struct sky2_hw *hw, unsigned port)
         /* Configure Rx MAC FIFO */
         sky2_write8(hw, SK_REG(port, RX_GMF_CTRL_T), GMF_RST_CLR);
         sky2_write16(hw, SK_REG(port, RX_GMF_CTRL_T),
-                     GMF_OPER_ON | GMF_RX_F_FL_ON);
+                     GMF_RX_CTRL_DEF);
 
         /* Flush Rx MAC FIFO on any flowcontrol or error */
         reg = GMR_FS_ANY_ERR;
@@ -717,6 +721,41 @@ static void sky2_rx_clean(struct sky2_port *sky2)
         }
 }
 
+#ifdef SKY2_VLAN_TAG_USED
+static void sky2_vlan_rx_register(struct net_device *dev, struct vlan_group *grp)
+{
+        struct sky2_port *sky2 = netdev_priv(dev);
+        struct sky2_hw *hw = sky2->hw;
+        u16 port = sky2->port;
+        unsigned long flags;
+
+        spin_lock_irqsave(&sky2->tx_lock, flags);
+
+        sky2_write32(hw, SK_REG(port, RX_GMF_CTRL_T), RX_VLAN_STRIP_ON);
+        sky2_write32(hw, SK_REG(port, TX_GMF_CTRL_T), TX_VLAN_TAG_ON);
+        sky2->vlgrp = grp;
+
+        spin_unlock_irqrestore(&sky2->tx_lock, flags);
+}
+
+static void sky2_vlan_rx_kill_vid(struct net_device *dev, unsigned short vid)
+{
+        struct sky2_port *sky2 = netdev_priv(dev);
+        struct sky2_hw *hw = sky2->hw;
+        u16 port = sky2->port;
+        unsigned long flags;
+
+        spin_lock_irqsave(&sky2->tx_lock, flags);
+
+        sky2_write32(hw, SK_REG(port, RX_GMF_CTRL_T), RX_VLAN_STRIP_OFF);
+        sky2_write32(hw, SK_REG(port, TX_GMF_CTRL_T), TX_VLAN_TAG_OFF);
+        if (sky2->vlgrp)
+                sky2->vlgrp->vlan_devices[vid] = NULL;
+
+        spin_unlock_irqrestore(&sky2->tx_lock, flags);
+}
+#endif
+
 #define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))
 static inline unsigned rx_size(const struct sky2_port *sky2)
 {
@@ -894,7 +933,7 @@ static int sky2_xmit_frame(struct sk_buff *skb, struct net_device *dev)
 {
         struct sky2_port *sky2 = netdev_priv(dev);
         struct sky2_hw *hw = sky2->hw;
-        struct sky2_tx_le *le;
+        struct sky2_tx_le *le = NULL;
         struct ring_info *re;
         unsigned long flags;
         unsigned i, len;
@@ -961,8 +1000,23 @@ static int sky2_xmit_frame(struct sk_buff *skb, struct net_device *dev)
                 sky2->tx_last_mss = mss;
         }
 
-        /* Handle TCP checksum offload */
         ctrl = 0;
+#ifdef SKY2_VLAN_TAG_USED
+        /* Add VLAN tag, can piggyback on LRGLEN or ADDR64 */
+        if (sky2->vlgrp && vlan_tx_tag_present(skb)) {
+                if (!le) {
+                        le = get_tx_le(sky2);
+                        le->tx.addr = 0;
+                        le->opcode = OP_VLAN|HW_OWNER;
+                        le->ctrl = 0;
+                } else
+                        le->opcode |= OP_VLAN;
+                le->length = cpu_to_be16(vlan_tx_tag_get(skb));
+                ctrl |= INS_VLAN;
+        }
+#endif
+
+        /* Handle TCP checksum offload */
         if (skb->ip_summed == CHECKSUM_HW) {
                 u16 hdr = skb->h.raw - skb->data;
                 u16 offset = hdr + skb->csum;
@@ -1436,10 +1490,7 @@ static struct sk_buff *sky2_receive(struct sky2_port *sky2,
 
         sky2->rx_next = (sky2->rx_next + 1) % sky2->rx_pending;
 
-        if (!(status & GMR_FS_RX_OK)
-            || (status & GMR_FS_ANY_ERR)
-            || (length << 16) != (status & GMR_FS_LEN)
-            || length > bufsize)
+        if (!(status & GMR_FS_RX_OK) || (status & GMR_FS_ANY_ERR))
                 goto error;
 
         if (length < RX_COPY_THRESHOLD) {
@@ -1539,6 +1590,9 @@ static int sky2_poll(struct net_device *dev0, int *budget)
                 u16 length;
 
                 BUG_ON(le->link >= hw->ports);
+                if (!hw->dev[le->link])
+                        goto skip;
+
                 sky2 = netdev_priv(hw->dev[le->link]);
                 status = le32_to_cpu(le->status);
                 length = le16_to_cpu(le->length);
@@ -1546,12 +1600,27 @@ static int sky2_poll(struct net_device *dev0, int *budget)
                 switch (le->opcode & ~HW_OWNER) {
                 case OP_RXSTAT:
                         skb = sky2_receive(sky2, length, status);
-                        if (likely(skb)) {
+                        if (!skb)
+                                break;
+#ifdef SKY2_VLAN_TAG_USED
+                        if (sky2->vlgrp && (status & GMR_FS_VLAN)) {
+                                vlan_hwaccel_receive_skb(skb,
+                                                         sky2->vlgrp,
+                                                         be16_to_cpu(sky2->rx_tag));
+                        } else
+#endif
                                 netif_receive_skb(skb);
-                                ++work_done;
-                        }
                         break;
 
+#ifdef SKY2_VLAN_TAG_USED
+                case OP_RXVLAN:
+                        sky2->rx_tag = length;
+                        break;
+
+                case OP_RXCHKSVLAN:
+                        sky2->rx_tag = length;
+                        /* fall through */
+#endif
                 case OP_RXCHKS:
                         skb = sky2->rx_ring[sky2->rx_next].skb;
                         skb->ip_summed = CHECKSUM_HW;
@@ -1563,9 +1632,6 @@ static int sky2_poll(struct net_device *dev0, int *budget)
                                          tx_index(sky2->port, status, length));
                         break;
 
-                case OP_RXTIMESTAMP:
-                        break;
-
                 default:
                         if (net_ratelimit())
                                 printk(KERN_WARNING PFX
@@ -1574,6 +1640,7 @@ static int sky2_poll(struct net_device *dev0, int *budget)
                         break;
                 }
 
+        skip:
                 hw->st_idx = (hw->st_idx + 1) % STATUS_RING_SIZE;
                 if (hw->st_idx == hwidx) {
                         hwidx = sky2_read16(hw, STAT_PUT_IDX);
@@ -2615,6 +2682,12 @@ static __devinit struct net_device *sky2_init_netdev(struct sky2_hw *hw,
                 dev->features |= NETIF_F_HIGHDMA;
         dev->features |= NETIF_F_IP_CSUM | NETIF_F_SG;
 
+#ifdef SKY2_VLAN_TAG_USED
+        dev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
+        dev->vlan_rx_register = sky2_vlan_rx_register;
+        dev->vlan_rx_kill_vid = sky2_vlan_rx_kill_vid;
+#endif
+
         /* read the mac address */
         memcpy_fromio(dev->dev_addr, hw->regs + B2_MAC_1 + port * 8, ETH_ALEN);
 
diff --git a/drivers/net/sky2.h b/drivers/net/sky2.h
index 1a8a004e1060..ac91d91f130b 100644
--- a/drivers/net/sky2.h
+++ b/drivers/net/sky2.h
@@ -1578,6 +1578,8 @@ enum {
         GMF_RST_SET     = 1<<0,         /* Set   GMAC FIFO Reset */
 
         RX_GMF_FL_THR_DEF = 0xa,        /* flush threshold (default) */
+
+        GMF_RX_CTRL_DEF = GMF_OPER_ON | GMF_RX_F_FL_ON,
 };
 
 
@@ -1826,6 +1828,10 @@ struct sky2_port {
         u16                  rx_put;            /* next le index to use */
         u16                  rx_pending;
         u16                  rx_last_put;
+#ifdef SKY2_VLAN_TAG_USED
+        u16                  rx_tag;
+        struct vlan_group    *vlgrp;
+#endif
 
         dma_addr_t           rx_le_map;
         dma_addr_t           tx_le_map;