[BNX2]: Add 1-shot MSI handler for 5709.

The 5709 supports the one-shot MSI handler similar to some of the tg3
chips.  In this mode, the MSI disables itself automatically until it
is re-enabled at the end of NAPI poll.

Put the request_irq/free_irq logic in common procedures.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
index f072028..97ed400 100644 (file)
--- a/drivers/net/bnx2.c
+++ b/drivers/net/bnx2.c
@@ -2261,6 +2261,23 @@ bnx2_msi(int irq, void *dev_instance)
        return IRQ_HANDLED;
 }
 
+static irqreturn_t
+bnx2_msi_1shot(int irq, void *dev_instance)
+{
+       struct net_device *dev = dev_instance;
+       struct bnx2 *bp = netdev_priv(dev);
+
+       prefetch(bp->status_blk);
+
+       /* Return here if interrupt is disabled. */
+       if (unlikely(atomic_read(&bp->intr_sem) != 0))
+               return IRQ_HANDLED;
+
+       netif_rx_schedule(dev);
+
+       return IRQ_HANDLED;
+}
+
 static irqreturn_t
 bnx2_interrupt(int irq, void *dev_instance)
 {
@@ -3759,13 +3776,17 @@ bnx2_init_chip(struct bnx2 *bp)
        REG_WR(bp, BNX2_HC_STAT_COLLECT_TICKS, 0xbb8);  /* 3ms */
 
        if (CHIP_ID(bp) == CHIP_ID_5706_A1)
-               REG_WR(bp, BNX2_HC_CONFIG, BNX2_HC_CONFIG_COLLECT_STATS);
+               val = BNX2_HC_CONFIG_COLLECT_STATS;
        else {
-               REG_WR(bp, BNX2_HC_CONFIG, BNX2_HC_CONFIG_RX_TMR_MODE |
-                      BNX2_HC_CONFIG_TX_TMR_MODE |
-                      BNX2_HC_CONFIG_COLLECT_STATS);
+               val = BNX2_HC_CONFIG_RX_TMR_MODE | BNX2_HC_CONFIG_TX_TMR_MODE |
+                     BNX2_HC_CONFIG_COLLECT_STATS;
        }
 
+       if (bp->flags & ONE_SHOT_MSI_FLAG)
+               val |= BNX2_HC_CONFIG_ONE_SHOT;
+
+       REG_WR(bp, BNX2_HC_CONFIG, val);
+
        /* Clear internal stats counters. */
        REG_WR(bp, BNX2_HC_COMMAND, BNX2_HC_COMMAND_CLR_STAT_NOW);
 
@@ -4610,6 +4631,38 @@ bnx2_restart_timer:
        mod_timer(&bp->timer, jiffies + bp->current_interval);
 }
 
+static int
+bnx2_request_irq(struct bnx2 *bp)
+{
+       struct net_device *dev = bp->dev;
+       int rc = 0;
+
+       if (bp->flags & USING_MSI_FLAG) {
+               irq_handler_t   fn = bnx2_msi;
+
+               if (bp->flags & ONE_SHOT_MSI_FLAG)
+                       fn = bnx2_msi_1shot;
+
+               rc = request_irq(bp->pdev->irq, fn, 0, dev->name, dev);
+       } else
+               rc = request_irq(bp->pdev->irq, bnx2_interrupt,
+                                IRQF_SHARED, dev->name, dev);
+       return rc;
+}
+
+static void
+bnx2_free_irq(struct bnx2 *bp)
+{
+       struct net_device *dev = bp->dev;
+
+       if (bp->flags & USING_MSI_FLAG) {
+               free_irq(bp->pdev->irq, dev);
+               pci_disable_msi(bp->pdev);
+               bp->flags &= ~(USING_MSI_FLAG | ONE_SHOT_MSI_FLAG);
+       } else
+               free_irq(bp->pdev->irq, dev);
+}
+
 /* Called with rtnl_lock */
 static int
 bnx2_open(struct net_device *dev)
@@ -4626,24 +4679,15 @@ bnx2_open(struct net_device *dev)
        if (rc)
                return rc;
 
-       if ((CHIP_ID(bp) != CHIP_ID_5706_A0) &&
-               (CHIP_ID(bp) != CHIP_ID_5706_A1) &&
-               !disable_msi) {
-
+       if ((bp->flags & MSI_CAP_FLAG) && !disable_msi) {
                if (pci_enable_msi(bp->pdev) == 0) {
                        bp->flags |= USING_MSI_FLAG;
-                       rc = request_irq(bp->pdev->irq, bnx2_msi, 0, dev->name,
-                                       dev);
+                       if (CHIP_NUM(bp) == CHIP_NUM_5709)
+                               bp->flags |= ONE_SHOT_MSI_FLAG;
                }
-               else {
-                       rc = request_irq(bp->pdev->irq, bnx2_interrupt,
-                                       IRQF_SHARED, dev->name, dev);
-               }
-       }
-       else {
-               rc = request_irq(bp->pdev->irq, bnx2_interrupt, IRQF_SHARED,
-                               dev->name, dev);
        }
+       rc = bnx2_request_irq(bp);
+
        if (rc) {
                bnx2_free_mem(bp);
                return rc;
@@ -4652,11 +4696,7 @@ bnx2_open(struct net_device *dev)
        rc = bnx2_init_nic(bp);
 
        if (rc) {
-               free_irq(bp->pdev->irq, dev);
-               if (bp->flags & USING_MSI_FLAG) {
-                       pci_disable_msi(bp->pdev);
-                       bp->flags &= ~USING_MSI_FLAG;
-               }
+               bnx2_free_irq(bp);
                bnx2_free_skbs(bp);
                bnx2_free_mem(bp);
                return rc;
@@ -4680,16 +4720,13 @@ bnx2_open(struct net_device *dev)
                               bp->dev->name);
 
                        bnx2_disable_int(bp);
-                       free_irq(bp->pdev->irq, dev);
-                       pci_disable_msi(bp->pdev);
-                       bp->flags &= ~USING_MSI_FLAG;
+                       bnx2_free_irq(bp);
 
                        rc = bnx2_init_nic(bp);
 
-                       if (!rc) {
-                               rc = request_irq(bp->pdev->irq, bnx2_interrupt,
-                                       IRQF_SHARED, dev->name, dev);
-                       }
+                       if (!rc)
+                               rc = bnx2_request_irq(bp);
+
                        if (rc) {
                                bnx2_free_skbs(bp);
                                bnx2_free_mem(bp);
@@ -4927,11 +4964,7 @@ bnx2_close(struct net_device *dev)
        else
                reset_code = BNX2_DRV_MSG_CODE_SUSPEND_NO_WOL;
        bnx2_reset_chip(bp, reset_code);
-       free_irq(bp->pdev->irq, dev);
-       if (bp->flags & USING_MSI_FLAG) {
-               pci_disable_msi(bp->pdev);
-               bp->flags &= ~USING_MSI_FLAG;
-       }
+       bnx2_free_irq(bp);
        bnx2_free_skbs(bp);
        bnx2_free_mem(bp);
        bp->link_up = 0;
@@ -6095,6 +6128,11 @@ bnx2_init_board(struct pci_dev *pdev, struct net_device *dev)
                }
        }
 
+       if (CHIP_ID(bp) != CHIP_ID_5706_A0 && CHIP_ID(bp) != CHIP_ID_5706_A1) {
+               if (pci_find_capability(pdev, PCI_CAP_ID_MSI))
+                       bp->flags |= MSI_CAP_FLAG;
+       }
+
        /* 5708 cannot support DMA addresses > 40-bit.  */
        if (CHIP_NUM(bp) == CHIP_NUM_5708)
                persist_dma_mask = dma_mask = DMA_40BIT_MASK;

diff --git a/drivers/net/bnx2.h b/drivers/net/bnx2.h
index ba175a8..121576d 100644 (file)
--- a/drivers/net/bnx2.h
+++ b/drivers/net/bnx2.h
@@ -6468,12 +6468,14 @@ struct bnx2 {
        u32                     last_status_idx;
 
        u32                     flags;
-#define PCIX_FLAG                      1
-#define PCI_32BIT_FLAG                 2
-#define ONE_TDMA_FLAG                  4       /* no longer used */
-#define NO_WOL_FLAG                    8
-#define USING_MSI_FLAG                 0x20
-#define ASF_ENABLE_FLAG                        0x40
+#define PCIX_FLAG                      0x00000001
+#define PCI_32BIT_FLAG                 0x00000002
+#define ONE_TDMA_FLAG                  0x00000004      /* no longer used */
+#define NO_WOL_FLAG                    0x00000008
+#define USING_MSI_FLAG                 0x00000020
+#define ASF_ENABLE_FLAG                        0x00000040
+#define MSI_CAP_FLAG                   0x00000080
+#define ONE_SHOT_MSI_FLAG              0x00000100
 
        /* Put tx producer and consumer fields in separate cache lines. */