C++ (Cpp) PREV_RX Examples

Example #1

File: sgiseeq.c Project: OpenHMR/Open-HMR600

static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp,
			      struct hpc3_ethregs *hregs,
			      struct sgiseeq_regs *sregs)
{
	struct sgiseeq_rx_desc *rd;
	struct sk_buff *skb = 0;
	unsigned char pkt_status;
	unsigned char *pkt_pointer = 0;
	int len = 0;
	unsigned int orig_end = PREV_RX(sp->rx_new);

	/* Service every received packet. */
	for_each_rx(rd, sp) {
		len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3;
		pkt_pointer = (unsigned char *)(long)rd->buf_vaddr;
		pkt_status = pkt_pointer[len + 2];

		if (pkt_status & SEEQ_RSTAT_FIG) {
			/* Packet is OK. */
			skb = dev_alloc_skb(len + 2);

			if (skb) {
				skb->dev = dev;
				skb_reserve(skb, 2);
				skb_put(skb, len);

				/* Copy out of kseg1 to avoid silly cache flush. */
				eth_copy_and_sum(skb, pkt_pointer + 2, len, 0);
				skb->protocol = eth_type_trans(skb, dev);

				/* We don't want to receive our own packets */
				if (memcmp(eth_hdr(skb)->h_source, dev->dev_addr, ETH_ALEN)) {
					netif_rx(skb);
					dev->last_rx = jiffies;
					sp->stats.rx_packets++;
					sp->stats.rx_bytes += len;
				} else {
					/* Silently drop my own packets */
					dev_kfree_skb_irq(skb);
				}
			} else {
				printk (KERN_NOTICE "%s: Memory squeeze, deferring packet.\n",
					dev->name);
				sp->stats.rx_dropped++;
			}
		} else {
			record_rx_errors(sp, pkt_status);
		}

		/* Return the entry to the ring pool. */
		rd->rdma.cntinfo = RCNTINFO_INIT;
		sp->rx_new = NEXT_RX(sp->rx_new);
	}

Example #2

File: sgiseeq.c Project: KaZoom/buildroot-linux-kernel-m3

static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp,
			      struct hpc3_ethregs *hregs,
			      struct sgiseeq_regs *sregs)
{
	struct sgiseeq_rx_desc *rd;
	struct sk_buff *skb = NULL;
	struct sk_buff *newskb;
	unsigned char pkt_status;
	int len = 0;
	unsigned int orig_end = PREV_RX(sp->rx_new);

	/* Service every received packet. */
	rd = &sp->rx_desc[sp->rx_new];
	dma_sync_desc_cpu(dev, rd);
	while (!(rd->rdma.cntinfo & HPCDMA_OWN)) {
		len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3;
		dma_unmap_single(dev->dev.parent, rd->rdma.pbuf,
				 PKT_BUF_SZ, DMA_FROM_DEVICE);
		pkt_status = rd->skb->data[len];
		if (pkt_status & SEEQ_RSTAT_FIG) {
			/* Packet is OK. */
			/* We don't want to receive our own packets */
			if (memcmp(rd->skb->data + 6, dev->dev_addr, ETH_ALEN)) {
				if (len > rx_copybreak) {
					skb = rd->skb;
					newskb = netdev_alloc_skb(dev, PKT_BUF_SZ);
					if (!newskb) {
						newskb = skb;
						skb = NULL;
						goto memory_squeeze;
					}
					skb_reserve(newskb, 2);
				} else {
					skb = netdev_alloc_skb_ip_align(dev, len);
					if (skb)
						skb_copy_to_linear_data(skb, rd->skb->data, len);

					newskb = rd->skb;
				}
memory_squeeze:
				if (skb) {
					skb_put(skb, len);
					skb->protocol = eth_type_trans(skb, dev);
					netif_rx(skb);
					dev->stats.rx_packets++;
					dev->stats.rx_bytes += len;
				} else {
					printk(KERN_NOTICE "%s: Memory squeeze, deferring packet.\n",
						dev->name);
					dev->stats.rx_dropped++;
				}
			} else {
				/* Silently drop my own packets */
				newskb = rd->skb;
			}
		} else {
			record_rx_errors(dev, pkt_status);
			newskb = rd->skb;
		}
		rd->skb = newskb;
		rd->rdma.pbuf = dma_map_single(dev->dev.parent,
					       newskb->data - 2,
					       PKT_BUF_SZ, DMA_FROM_DEVICE);

		/* Return the entry to the ring pool. */
		rd->rdma.cntinfo = RCNTINFO_INIT;
		sp->rx_new = NEXT_RX(sp->rx_new);
		dma_sync_desc_dev(dev, rd);
		rd = &sp->rx_desc[sp->rx_new];
		dma_sync_desc_cpu(dev, rd);
	}
	dma_sync_desc_cpu(dev, &sp->rx_desc[orig_end]);
	sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR);
	dma_sync_desc_dev(dev, &sp->rx_desc[orig_end]);
	dma_sync_desc_cpu(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]);
	sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR;
	dma_sync_desc_dev(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]);
	rx_maybe_restart(sp, hregs, sregs);
}