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korina: rework korina_rx() for use with napi

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This function needs an early exit condition to function properly, or
else caller assumes napi workload wasn't enough to handle all received
packets and korina_rx is called again (and again and again and ...).

Signed-off-by: Phil Sutter <n0-1@freewrt.org>
Acked-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Phil Sutter 2009-01-14 21:48:59 -08:00 committed by David S. Miller
parent beb0babfb7
commit 4cf83b664f
1 changed files with 46 additions and 49 deletions
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95
drivers/net/korina.c
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@ -353,15 +353,20 @@ static int korina_rx(struct net_device *dev, int limit)
struct dma_desc *rd = &lp->rd_ring[lp->rx_next_done];
struct sk_buff *skb, *skb_new;
u8 *pkt_buf;
u32 devcs, pkt_len, dmas, rx_free_desc;
u32 devcs, pkt_len, dmas;
int count;
dma_cache_inv((u32)rd, sizeof(*rd));
for (count = 0; count < limit; count++) {
skb = lp->rx_skb[lp->rx_next_done];
skb_new = NULL;
devcs = rd->devcs;
if ((KORINA_RBSIZE - (u32)DMA_COUNT(rd->control)) == 0)
break;
/* Update statistics counters */
if (devcs & ETH_RX_CRC)
dev->stats.rx_crc_errors++;
@ -384,63 +389,55 @@ static int korina_rx(struct net_device *dev, int limit)
* in Rc32434 (errata ref #077) */
dev->stats.rx_errors++;
dev->stats.rx_dropped++;
}
while ((rx_free_desc = KORINA_RBSIZE - (u32)DMA_COUNT(rd->control)) != 0) {
/* init the var. used for the later
* operations within the while loop */
skb_new = NULL;
} else if ((devcs & ETH_RX_ROK)) {
pkt_len = RCVPKT_LENGTH(devcs);
skb = lp->rx_skb[lp->rx_next_done];
if ((devcs & ETH_RX_ROK)) {
/* must be the (first and) last
* descriptor then */
pkt_buf = (u8 *)lp->rx_skb[lp->rx_next_done]->data;
/* must be the (first and) last
* descriptor then */
pkt_buf = (u8 *)lp->rx_skb[lp->rx_next_done]->data;
/* invalidate the cache */
dma_cache_inv((unsigned long)pkt_buf, pkt_len - 4);
/* invalidate the cache */
dma_cache_inv((unsigned long)pkt_buf, pkt_len - 4);
/* Malloc up new buffer. */
skb_new = netdev_alloc_skb(dev, KORINA_RBSIZE + 2);
/* Malloc up new buffer. */
skb_new = netdev_alloc_skb(dev, KORINA_RBSIZE + 2);
if (!skb_new)
break;
/* Do not count the CRC */
skb_put(skb, pkt_len - 4);
skb->protocol = eth_type_trans(skb, dev);
if (!skb_new)
break;
/* Do not count the CRC */
skb_put(skb, pkt_len - 4);
skb->protocol = eth_type_trans(skb, dev);
/* Pass the packet to upper layers */
netif_receive_skb(skb);
dev->stats.rx_packets++;
dev->stats.rx_bytes += pkt_len;
/* Pass the packet to upper layers */
netif_receive_skb(skb);
dev->stats.rx_packets++;
dev->stats.rx_bytes += pkt_len;
/* Update the mcast stats */
if (devcs & ETH_RX_MP)
dev->stats.multicast++;
/* Update the mcast stats */
if (devcs & ETH_RX_MP)
dev->stats.multicast++;
lp->rx_skb[lp->rx_next_done] = skb_new;
}
rd->devcs = 0;
/* Restore descriptor's curr_addr */
if (skb_new)
rd->ca = CPHYSADDR(skb_new->data);
else
rd->ca = CPHYSADDR(skb->data);
rd->control = DMA_COUNT(KORINA_RBSIZE) |
DMA_DESC_COD | DMA_DESC_IOD;
lp->rd_ring[(lp->rx_next_done - 1) &
KORINA_RDS_MASK].control &=
~DMA_DESC_COD;
lp->rx_next_done = (lp->rx_next_done + 1) & KORINA_RDS_MASK;
dma_cache_wback((u32)rd, sizeof(*rd));
rd = &lp->rd_ring[lp->rx_next_done];
writel(~DMA_STAT_DONE, &lp->rx_dma_regs->dmas);
lp->rx_skb[lp->rx_next_done] = skb_new;
}
rd->devcs = 0;
/* Restore descriptor's curr_addr */
if (skb_new)
rd->ca = CPHYSADDR(skb_new->data);
else
rd->ca = CPHYSADDR(skb->data);
rd->control = DMA_COUNT(KORINA_RBSIZE) |
DMA_DESC_COD | DMA_DESC_IOD;
lp->rd_ring[(lp->rx_next_done - 1) &
KORINA_RDS_MASK].control &=
~DMA_DESC_COD;
lp->rx_next_done = (lp->rx_next_done + 1) & KORINA_RDS_MASK;
dma_cache_wback((u32)rd, sizeof(*rd));
rd = &lp->rd_ring[lp->rx_next_done];
writel(~DMA_STAT_DONE, &lp->rx_dma_regs->dmas);
}
dmas = readl(&lp->rx_dma_regs->dmas);