[PATCH] MACB: clear transmit buffers properly on transmit underrun
From: Haavard Skinnemoen <hidden>
Date: 2007-12-19 17:26:10
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Gregory CLEMENT <redacted> Initially transmit buffer pointers were only reset. But buffer descriptors were possibly still set as ready, and buffer in upper layer was not freed. This caused driver hang under big load. Now reset clean properly the buffer descriptor and freed upper layer. Signed-off-by: Gregory CLEMENT <redacted> Signed-off-by: Haavard Skinnemoen <redacted> --- drivers/net/macb.c | 25 ++++++++++++++++++++++++- 1 files changed, 24 insertions(+), 1 deletions(-)
diff --git a/drivers/net/macb.c b/drivers/net/macb.c
index 047ea7b..e10528e 100644
--- a/drivers/net/macb.c
+++ b/drivers/net/macb.c@@ -307,8 +307,31 @@ static void macb_tx(struct macb *bp) (unsigned long)status); if (status & MACB_BIT(UND)) { + int i; printk(KERN_ERR "%s: TX underrun, resetting buffers\n", - bp->dev->name); + bp->dev->name); + + head = bp->tx_head; + + /*Mark all the buffer as used to avoid sending a lost buffer*/ + for (i = 0; i < TX_RING_SIZE; i++) + bp->tx_ring[i].ctrl = MACB_BIT(TX_USED); + + /* free transmit buffer in upper layer*/ + for (tail = bp->tx_tail; tail != head; tail = NEXT_TX(tail)) { + struct ring_info *rp = &bp->tx_skb[tail]; + struct sk_buff *skb = rp->skb; + + BUG_ON(skb == NULL); + + rmb(); + + dma_unmap_single(&bp->pdev->dev, rp->mapping, skb->len, + DMA_TO_DEVICE); + rp->skb = NULL; + dev_kfree_skb_irq(skb); + } + bp->tx_head = bp->tx_tail = 0; }
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1.5.3.4