1 files changed, 137 insertions, 138 deletions

diff --git a/drivers/net/skge.c b/drivers/net/skge.c
index 25e028b7ce48..4eda81d41b10 100644
--- a/drivers/net/skge.c
+++ b/drivers/net/skge.c
@@ -44,7 +44,7 @@
 #include "skge.h"
 
 #define DRV_NAME                "skge"
-#define DRV_VERSION             "1.3"
+#define DRV_VERSION             "1.4"
 #define PFX                     DRV_NAME " "
 
 #define DEFAULT_TX_RING_SIZE    128
@@ -104,7 +104,6 @@ static const int txqaddr[] = { Q_XA1, Q_XA2 };
 static const int rxqaddr[] = { Q_R1, Q_R2 };
 static const u32 rxirqmask[] = { IS_R1_F, IS_R2_F };
 static const u32 txirqmask[] = { IS_XA1_F, IS_XA2_F };
-static const u32 portirqmask[] = { IS_PORT_1, IS_PORT_2 };
 
 static int skge_get_regs_len(struct net_device *dev)
 {
@@ -728,19 +727,18 @@ static struct ethtool_ops skge_ethtool_ops = {
  * Allocate ring elements and chain them together
  * One-to-one association of board descriptors with ring elements
  */
-static int skge_ring_alloc(struct skge_ring *ring, void *vaddr, u64 base)
+static int skge_ring_alloc(struct skge_ring *ring, void *vaddr, u32 base)
 {
         struct skge_tx_desc *d;
         struct skge_element *e;
         int i;
 
-        ring->start = kmalloc(sizeof(*e)*ring->count, GFP_KERNEL);
+        ring->start = kcalloc(sizeof(*e), ring->count, GFP_KERNEL);
         if (!ring->start)
                 return -ENOMEM;
 
         for (i = 0, e = ring->start, d = vaddr; i < ring->count; i++, e++, d++) {
                 e->desc = d;
-                e->skb = NULL;
                 if (i == ring->count - 1) {
                         e->next = ring->start;
                         d->next_offset = base;
@@ -2169,27 +2167,31 @@ static int skge_up(struct net_device *dev)
         if (!skge->mem)
                 return -ENOMEM;
 
+        BUG_ON(skge->dma & 7);
+
+        if ((u64)skge->dma >> 32 != ((u64) skge->dma + skge->mem_size) >> 32) {
+                printk(KERN_ERR PFX "pci_alloc_consistent region crosses 4G boundary\n");
+                err = -EINVAL;
+                goto free_pci_mem;
+        }
+
         memset(skge->mem, 0, skge->mem_size);
 
-        if ((err = skge_ring_alloc(&skge->rx_ring, skge->mem, skge->dma)))
+        err = skge_ring_alloc(&skge->rx_ring, skge->mem, skge->dma);
+        if (err)
                 goto free_pci_mem;
 
         err = skge_rx_fill(skge);
         if (err)
                 goto free_rx_ring;
 
-        if ((err = skge_ring_alloc(&skge->tx_ring, skge->mem + rx_size,
-                                   skge->dma + rx_size)))
+        err = skge_ring_alloc(&skge->tx_ring, skge->mem + rx_size,
+                              skge->dma + rx_size);
+        if (err)
                 goto free_rx_ring;
 
         skge->tx_avail = skge->tx_ring.count - 1;
 
-        /* Enable IRQ from port */
-        spin_lock_irq(&hw->hw_lock);
-        hw->intr_mask |= portirqmask[port];
-        skge_write32(hw, B0_IMSK, hw->intr_mask);
-        spin_unlock_irq(&hw->hw_lock);
-
         /* Initialize MAC */
         spin_lock_bh(&hw->phy_lock);
         if (hw->chip_id == CHIP_ID_GENESIS)
@@ -2246,11 +2248,6 @@ static int skge_down(struct net_device *dev)
         else
                 yukon_stop(skge);
 
-        spin_lock_irq(&hw->hw_lock);
-        hw->intr_mask &= ~portirqmask[skge->port];
-        skge_write32(hw, B0_IMSK, hw->intr_mask);
-        spin_unlock_irq(&hw->hw_lock);
-
         /* Stop transmitter */
         skge_write8(hw, Q_ADDR(txqaddr[port], Q_CSR), CSR_STOP);
         skge_write32(hw, RB_ADDR(txqaddr[port], RB_CTRL),
@@ -2307,18 +2304,15 @@ static int skge_xmit_frame(struct sk_buff *skb, struct net_device *dev)
         int i;
         u32 control, len;
         u64 map;
-        unsigned long flags;
 
         skb = skb_padto(skb, ETH_ZLEN);
         if (!skb)
                 return NETDEV_TX_OK;
 
-        local_irq_save(flags);
         if (!spin_trylock(&skge->tx_lock)) {
-                /* Collision - tell upper layer to requeue */
-                local_irq_restore(flags);
-                return NETDEV_TX_LOCKED;
-        }
+                /* Collision - tell upper layer to requeue */
+                return NETDEV_TX_LOCKED;
+        }
 
         if (unlikely(skge->tx_avail < skb_shinfo(skb)->nr_frags +1)) {
                 if (!netif_queue_stopped(dev)) {
@@ -2327,7 +2321,7 @@ static int skge_xmit_frame(struct sk_buff *skb, struct net_device *dev)
                         printk(KERN_WARNING PFX "%s: ring full when queue awake!\n",
                                dev->name);
                 }
-                spin_unlock_irqrestore(&skge->tx_lock, flags);
+                spin_unlock(&skge->tx_lock);
                 return NETDEV_TX_BUSY;
         }
 
@@ -2402,8 +2396,10 @@ static int skge_xmit_frame(struct sk_buff *skb, struct net_device *dev)
                 netif_stop_queue(dev);
         }
 
+        mmiowb();
+        spin_unlock(&skge->tx_lock);
+
         dev->trans_start = jiffies;
-        spin_unlock_irqrestore(&skge->tx_lock, flags);
 
         return NETDEV_TX_OK;
 }
@@ -2416,7 +2412,7 @@ static inline void skge_tx_free(struct skge_hw *hw, struct skge_element *e)
                                pci_unmap_addr(e, mapaddr),
                                pci_unmap_len(e, maplen),
                                PCI_DMA_TODEVICE);
-                dev_kfree_skb_any(e->skb);
+                dev_kfree_skb(e->skb);
                 e->skb = NULL;
         } else {
                 pci_unmap_page(hw->pdev,
@@ -2430,15 +2426,14 @@ static void skge_tx_clean(struct skge_port *skge)
 {
         struct skge_ring *ring = &skge->tx_ring;
         struct skge_element *e;
-        unsigned long flags;
 
-        spin_lock_irqsave(&skge->tx_lock, flags);
+        spin_lock_bh(&skge->tx_lock);
         for (e = ring->to_clean; e != ring->to_use; e = e->next) {
                 ++skge->tx_avail;
                 skge_tx_free(skge->hw, e);
         }
         ring->to_clean = e;
-        spin_unlock_irqrestore(&skge->tx_lock, flags);
+        spin_unlock_bh(&skge->tx_lock);
 }
 
 static void skge_tx_timeout(struct net_device *dev)
@@ -2663,6 +2658,37 @@ resubmit:
         return NULL;
 }
 
+static void skge_tx_done(struct skge_port *skge)
+{
+        struct skge_ring *ring = &skge->tx_ring;
+        struct skge_element *e;
+
+        spin_lock(&skge->tx_lock);
+        for (e = ring->to_clean; prefetch(e->next), e != ring->to_use; e = e->next) {
+                struct skge_tx_desc *td = e->desc;
+                u32 control;
+
+                rmb();
+                control = td->control;
+                if (control & BMU_OWN)
+                        break;
+
+                if (unlikely(netif_msg_tx_done(skge)))
+                        printk(KERN_DEBUG PFX "%s: tx done slot %td status 0x%x\n",
+                               skge->netdev->name, e - ring->start, td->status);
+
+                skge_tx_free(skge->hw, e);
+                e->skb = NULL;
+                ++skge->tx_avail;
+        }
+        ring->to_clean = e;
+        skge_write8(skge->hw, Q_ADDR(txqaddr[skge->port], Q_CSR), CSR_IRQ_CL_F);
+
+        if (skge->tx_avail > MAX_SKB_FRAGS + 1)
+                netif_wake_queue(skge->netdev);
+
+        spin_unlock(&skge->tx_lock);
+}
 
 static int skge_poll(struct net_device *dev, int *budget)
 {
@@ -2670,8 +2696,10 @@ static int skge_poll(struct net_device *dev, int *budget)
         struct skge_hw *hw = skge->hw;
         struct skge_ring *ring = &skge->rx_ring;
         struct skge_element *e;
-        unsigned int to_do = min(dev->quota, *budget);
-        unsigned int work_done = 0;
+        int to_do = min(dev->quota, *budget);
+        int work_done = 0;
+
+        skge_tx_done(skge);
 
         for (e = ring->to_clean; prefetch(e->next), work_done < to_do; e = e->next) {
                 struct skge_rx_desc *rd = e->desc;
@@ -2683,8 +2711,8 @@ static int skge_poll(struct net_device *dev, int *budget)
                 if (control & BMU_OWN)
                         break;
 
-                skb = skge_rx_get(skge, e, control, rd->status,
-                                  le16_to_cpu(rd->csum2));
+                skb = skge_rx_get(skge, e, control, rd->status,
+                                  le16_to_cpu(rd->csum2));
                 if (likely(skb)) {
                         dev->last_rx = jiffies;
                         netif_receive_skb(skb);
@@ -2705,49 +2733,15 @@ static int skge_poll(struct net_device *dev, int *budget)
         if (work_done >=  to_do)
                 return 1; /* not done */
 
-        spin_lock_irq(&hw->hw_lock);
-        __netif_rx_complete(dev);
-        hw->intr_mask |= portirqmask[skge->port];
+        netif_rx_complete(dev);
+        mmiowb();
+
+        hw->intr_mask |= skge->port == 0 ? (IS_R1_F|IS_XA1_F) : (IS_R2_F|IS_XA2_F);
         skge_write32(hw, B0_IMSK, hw->intr_mask);
-        spin_unlock_irq(&hw->hw_lock);
 
         return 0;
 }
 
-static inline void skge_tx_intr(struct net_device *dev)
-{
-        struct skge_port *skge = netdev_priv(dev);
-        struct skge_hw *hw = skge->hw;
-        struct skge_ring *ring = &skge->tx_ring;
-        struct skge_element *e;
-
-        spin_lock(&skge->tx_lock);
-        for (e = ring->to_clean; prefetch(e->next), e != ring->to_use; e = e->next) {
-                struct skge_tx_desc *td = e->desc;
-                u32 control;
-
-                rmb();
-                control = td->control;
-                if (control & BMU_OWN)
-                        break;
-
-                if (unlikely(netif_msg_tx_done(skge)))
-                        printk(KERN_DEBUG PFX "%s: tx done slot %td status 0x%x\n",
-                               dev->name, e - ring->start, td->status);
-
-                skge_tx_free(hw, e);
-                e->skb = NULL;
-                ++skge->tx_avail;
-        }
-        ring->to_clean = e;
-        skge_write8(hw, Q_ADDR(txqaddr[skge->port], Q_CSR), CSR_IRQ_CL_F);
-
-        if (skge->tx_avail > MAX_SKB_FRAGS + 1)
-                netif_wake_queue(dev);
-
-        spin_unlock(&skge->tx_lock);
-}
-
 /* Parity errors seem to happen when Genesis is connected to a switch
  * with no other ports present. Heartbeat error??
  */
@@ -2770,17 +2764,6 @@ static void skge_mac_parity(struct skge_hw *hw, int port)
                             ? GMF_CLI_TX_FC : GMF_CLI_TX_PE);
 }
 
-static void skge_pci_clear(struct skge_hw *hw)
-{
-        u16 status;
-
-        pci_read_config_word(hw->pdev, PCI_STATUS, &status);
-        skge_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_ON);
-        pci_write_config_word(hw->pdev, PCI_STATUS,
-                              status | PCI_STATUS_ERROR_BITS);
-        skge_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_OFF);
-}
-
 static void skge_mac_intr(struct skge_hw *hw, int port)
 {
         if (hw->chip_id == CHIP_ID_GENESIS)
@@ -2822,23 +2805,39 @@ static void skge_error_irq(struct skge_hw *hw)
         if (hwstatus & IS_M2_PAR_ERR)
                 skge_mac_parity(hw, 1);
 
-        if (hwstatus & IS_R1_PAR_ERR)
+        if (hwstatus & IS_R1_PAR_ERR) {
+                printk(KERN_ERR PFX "%s: receive queue parity error\n",
+                       hw->dev[0]->name);
                 skge_write32(hw, B0_R1_CSR, CSR_IRQ_CL_P);
+        }
 
-        if (hwstatus & IS_R2_PAR_ERR)
+        if (hwstatus & IS_R2_PAR_ERR) {
+                printk(KERN_ERR PFX "%s: receive queue parity error\n",
+                       hw->dev[1]->name);
                 skge_write32(hw, B0_R2_CSR, CSR_IRQ_CL_P);
+        }
 
         if (hwstatus & (IS_IRQ_MST_ERR|IS_IRQ_STAT)) {
-                printk(KERN_ERR PFX "hardware error detected (status 0x%x)\n",
-                       hwstatus);
+                u16 pci_status, pci_cmd;
+
+                pci_read_config_word(hw->pdev, PCI_COMMAND, &pci_cmd);
+                pci_read_config_word(hw->pdev, PCI_STATUS, &pci_status);
 
-                skge_pci_clear(hw);
+                printk(KERN_ERR PFX "%s: PCI error cmd=%#x status=%#x\n",
+                               pci_name(hw->pdev), pci_cmd, pci_status);
+
+                /* Write the error bits back to clear them. */
+                pci_status &= PCI_STATUS_ERROR_BITS;
+                skge_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_ON);
+                pci_write_config_word(hw->pdev, PCI_COMMAND,
+                                      pci_cmd | PCI_COMMAND_SERR | PCI_COMMAND_PARITY);
+                pci_write_config_word(hw->pdev, PCI_STATUS, pci_status);
+                skge_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_OFF);
 
                 /* if error still set then just ignore it */
                 hwstatus = skge_read32(hw, B0_HWE_ISRC);
                 if (hwstatus & IS_IRQ_STAT) {
-                        pr_debug("IRQ status %x: still set ignoring hardware errors\n",
-                               hwstatus);
+                        printk(KERN_INFO PFX "unable to clear error (so ignoring them)\n");
                         hw->intr_mask &= ~IS_HW_ERR;
                 }
         }
@@ -2855,12 +2854,11 @@ static void skge_extirq(unsigned long data)
         int port;
 
         spin_lock(&hw->phy_lock);
-        for (port = 0; port < 2; port++) {
+        for (port = 0; port < hw->ports; port++) {
                 struct net_device *dev = hw->dev[port];
+                struct skge_port *skge = netdev_priv(dev);
 
-                if (dev && netif_running(dev)) {
-                        struct skge_port *skge = netdev_priv(dev);
-
+                if (netif_running(dev)) {
                         if (hw->chip_id != CHIP_ID_GENESIS)
                                 yukon_phy_intr(skge);
                         else
@@ -2869,38 +2867,39 @@ static void skge_extirq(unsigned long data)
         }
         spin_unlock(&hw->phy_lock);
 
-        spin_lock_irq(&hw->hw_lock);
         hw->intr_mask |= IS_EXT_REG;
         skge_write32(hw, B0_IMSK, hw->intr_mask);
-        spin_unlock_irq(&hw->hw_lock);
 }
 
 static irqreturn_t skge_intr(int irq, void *dev_id, struct pt_regs *regs)
 {
         struct skge_hw *hw = dev_id;
-        u32 status = skge_read32(hw, B0_SP_ISRC);
+        u32 status;
 
-        if (status == 0 || status == ~0) /* hotplug or shared irq */
+        /* Reading this register masks IRQ */
+        status = skge_read32(hw, B0_SP_ISRC);
+        if (status == 0)
                 return IRQ_NONE;
 
-        spin_lock(&hw->hw_lock);
-        if (status & IS_R1_F) {
+        if (status & IS_EXT_REG) {
+                hw->intr_mask &= ~IS_EXT_REG;
+                tasklet_schedule(&hw->ext_tasklet);
+        }
+
+        if (status & (IS_R1_F|IS_XA1_F)) {
                 skge_write8(hw, Q_ADDR(Q_R1, Q_CSR), CSR_IRQ_CL_F);
-                hw->intr_mask &= ~IS_R1_F;
+                hw->intr_mask &= ~(IS_R1_F|IS_XA1_F);
                 netif_rx_schedule(hw->dev[0]);
         }
 
-        if (status & IS_R2_F) {
+        if (status & (IS_R2_F|IS_XA2_F)) {
                 skge_write8(hw, Q_ADDR(Q_R2, Q_CSR), CSR_IRQ_CL_F);
-                hw->intr_mask &= ~IS_R2_F;
+                hw->intr_mask &= ~(IS_R2_F|IS_XA2_F);
                 netif_rx_schedule(hw->dev[1]);
         }
 
-        if (status & IS_XA1_F)
-                skge_tx_intr(hw->dev[0]);
-
-        if (status & IS_XA2_F)
-                skge_tx_intr(hw->dev[1]);
+        if (likely((status & hw->intr_mask) == 0))
+                return IRQ_HANDLED;
 
         if (status & IS_PA_TO_RX1) {
                 struct skge_port *skge = netdev_priv(hw->dev[0]);
@@ -2929,13 +2928,7 @@ static irqreturn_t skge_intr(int irq, void *dev_id, struct pt_regs *regs)
         if (status & IS_HW_ERR)
                 skge_error_irq(hw);
 
-        if (status & IS_EXT_REG) {
-                hw->intr_mask &= ~IS_EXT_REG;
-                tasklet_schedule(&hw->ext_tasklet);
-        }
-
         skge_write32(hw, B0_IMSK, hw->intr_mask);
-        spin_unlock(&hw->hw_lock);
 
         return IRQ_HANDLED;
 }
@@ -3010,7 +3003,7 @@ static const char *skge_board_name(const struct skge_hw *hw)
 static int skge_reset(struct skge_hw *hw)
 {
         u32 reg;
-        u16 ctst;
+        u16 ctst, pci_status;
         u8 t8, mac_cfg, pmd_type, phy_type;
         int i;
 
@@ -3021,8 +3014,13 @@ static int skge_reset(struct skge_hw *hw)
         skge_write8(hw, B0_CTST, CS_RST_CLR);
 
         /* clear PCI errors, if any */
-        skge_pci_clear(hw);
+        skge_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_ON);
+        skge_write8(hw, B2_TST_CTRL2, 0);
 
+        pci_read_config_word(hw->pdev, PCI_STATUS, &pci_status);
+        pci_write_config_word(hw->pdev, PCI_STATUS,
+                              pci_status | PCI_STATUS_ERROR_BITS);
+        skge_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_OFF);
         skge_write8(hw, B0_CTST, CS_MRST_CLR);
 
         /* restore CLK_RUN bits (for Yukon-Lite) */
@@ -3081,7 +3079,10 @@ static int skge_reset(struct skge_hw *hw)
         else
                 hw->ram_size = t8 * 4096;
 
-        hw->intr_mask = IS_HW_ERR | IS_EXT_REG;
+        hw->intr_mask = IS_HW_ERR | IS_EXT_REG | IS_PORT_1;
+        if (hw->ports > 1)
+                hw->intr_mask |= IS_PORT_2;
+
         if (hw->chip_id == CHIP_ID_GENESIS)
                 genesis_init(hw);
         else {
@@ -3251,13 +3252,15 @@ static int __devinit skge_probe(struct pci_dev *pdev,
         struct skge_hw *hw;
         int err, using_dac = 0;
 
-        if ((err = pci_enable_device(pdev))) {
+        err = pci_enable_device(pdev);
+        if (err) {
                 printk(KERN_ERR PFX "%s cannot enable PCI device\n",
                        pci_name(pdev));
                 goto err_out;
         }
 
-        if ((err = pci_request_regions(pdev, DRV_NAME))) {
+        err = pci_request_regions(pdev, DRV_NAME);
+        if (err) {
                 printk(KERN_ERR PFX "%s cannot obtain PCI resources\n",
                        pci_name(pdev));
                 goto err_out_disable_pdev;
@@ -3265,22 +3268,18 @@ static int __devinit skge_probe(struct pci_dev *pdev,
 
         pci_set_master(pdev);
 
-        if (sizeof(dma_addr_t) > sizeof(u32) &&
-            !(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK))) {
+        if (!pci_set_dma_mask(pdev, DMA_64BIT_MASK)) {
                 using_dac = 1;
                 err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK);
-                if (err < 0) {
-                        printk(KERN_ERR PFX "%s unable to obtain 64 bit DMA "
-                               "for consistent allocations\n", pci_name(pdev));
-                        goto err_out_free_regions;
-                }
-        } else {
-                err = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
-                if (err) {
-                        printk(KERN_ERR PFX "%s no usable DMA configuration\n",
-                               pci_name(pdev));
-                        goto err_out_free_regions;
-                }
+        } else if (!(err = pci_set_dma_mask(pdev, DMA_32BIT_MASK))) {
+                using_dac = 0;
+                err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
+        }
+
+        if (err) {
+                printk(KERN_ERR PFX "%s no usable DMA configuration\n",
+                       pci_name(pdev));
+                goto err_out_free_regions;
         }
 
 #ifdef __BIG_ENDIAN
@@ -3304,7 +3303,6 @@ static int __devinit skge_probe(struct pci_dev *pdev,
 
         hw->pdev = pdev;
         spin_lock_init(&hw->phy_lock);
-        spin_lock_init(&hw->hw_lock);
         tasklet_init(&hw->ext_tasklet, skge_extirq, (unsigned long) hw);
 
         hw->regs = ioremap_nocache(pci_resource_start(pdev, 0), 0x4000);
@@ -3314,7 +3312,8 @@ static int __devinit skge_probe(struct pci_dev *pdev,
                 goto err_out_free_hw;
         }
 
-        if ((err = request_irq(pdev->irq, skge_intr, SA_SHIRQ, DRV_NAME, hw))) {
+        err = request_irq(pdev->irq, skge_intr, SA_SHIRQ, DRV_NAME, hw);
+        if (err) {
                 printk(KERN_ERR PFX "%s: cannot assign irq %d\n",
                        pci_name(pdev), pdev->irq);
                 goto err_out_iounmap;
@@ -3332,7 +3331,8 @@ static int __devinit skge_probe(struct pci_dev *pdev,
         if ((dev = skge_devinit(hw, 0, using_dac)) == NULL)
                 goto err_out_led_off;
 
-        if ((err = register_netdev(dev))) {
+        err = register_netdev(dev);
+        if (err) {
                 printk(KERN_ERR PFX "%s: cannot register net device\n",
                        pci_name(pdev));
                 goto err_out_free_netdev;
@@ -3387,7 +3387,6 @@ static void __devexit skge_remove(struct pci_dev *pdev)
 
         skge_write32(hw, B0_IMSK, 0);
         skge_write16(hw, B0_LED, LED_STAT_OFF);
-        skge_pci_clear(hw);
         skge_write8(hw, B0_CTST, CS_RST_SET);
 
         tasklet_kill(&hw->ext_tasklet);