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[BNX2]: Restructure RX fast path handling. 

Add a new function to handle new SKB allocation and to prepare the
completed SKB.  This makes it easier to add support for non-linear
SKB.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Chan 2007-12-12 11:17:01 -08:00 committed by David S. Miller
parent e343d55c0a
commit 85833c6269
1 changed files with 30 additions and 16 deletions
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46
drivers/net/bnx2.c
View File

@ -2379,6 +2379,27 @@ bnx2_reuse_rx_skb(struct bnx2 *bp, struct sk_buff *skb,
prod_bd->rx_bd_haddr_lo = cons_bd->rx_bd_haddr_lo;
}
static int
bnx2_rx_skb(struct bnx2 *bp, struct sk_buff *skb, unsigned int len,
dma_addr_t dma_addr, u32 ring_idx)
{
int err;
u16 prod = ring_idx & 0xffff;
err = bnx2_alloc_rx_skb(bp, prod);
if (unlikely(err)) {
bnx2_reuse_rx_skb(bp, skb, (u16) (ring_idx >> 16), prod);
return err;
}
skb_reserve(skb, bp->rx_offset);
pci_unmap_single(bp->pdev, dma_addr, bp->rx_buf_use_size,
PCI_DMA_FROMDEVICE);
skb_put(skb, len);
return 0;
}
static inline u16
bnx2_get_hw_rx_cons(struct bnx2 *bp)
{
@ -2434,7 +2455,8 @@ bnx2_rx_int(struct bnx2 *bp, int budget)
L2_FHDR_ERRORS_TOO_SHORT |
L2_FHDR_ERRORS_GIANT_FRAME)) {
goto reuse_rx;
bnx2_reuse_rx_skb(bp, skb, sw_ring_cons, sw_ring_prod);
goto next_rx;
}
/* Since we don't have a jumbo ring, copy small packets
@ -2444,8 +2466,11 @@ bnx2_rx_int(struct bnx2 *bp, int budget)
struct sk_buff *new_skb;
new_skb = netdev_alloc_skb(bp->dev, len + 2);
if (new_skb == NULL)
goto reuse_rx;
if (new_skb == NULL) {
bnx2_reuse_rx_skb(bp, skb, sw_ring_cons,
sw_ring_prod);
goto next_rx;
}
/* aligned copy */
skb_copy_from_linear_data_offset(skb, bp->rx_offset - 2,
@ -2457,20 +2482,9 @@ bnx2_rx_int(struct bnx2 *bp, int budget)
sw_ring_cons, sw_ring_prod);
skb = new_skb;
}
else if (bnx2_alloc_rx_skb(bp, sw_ring_prod) == 0) {
pci_unmap_single(bp->pdev, dma_addr,
bp->rx_buf_use_size, PCI_DMA_FROMDEVICE);
skb_reserve(skb, bp->rx_offset);
skb_put(skb, len);
}
else {
reuse_rx:
bnx2_reuse_rx_skb(bp, skb,
sw_ring_cons, sw_ring_prod);
} else if (unlikely(bnx2_rx_skb(bp, skb, len, dma_addr,
(sw_ring_cons << 16) | sw_ring_prod)))
goto next_rx;
}
skb->protocol = eth_type_trans(skb, bp->dev);