Exemplo n.º 1
0
/* NAPI receive function */
static int fs_enet_rx_napi(struct napi_struct *napi, int budget)
{
	struct fs_enet_private *fep = container_of(napi, struct fs_enet_private, napi);
	struct net_device *dev = fep->ndev;
	const struct fs_platform_info *fpi = fep->fpi;
	cbd_t __iomem *bdp;
	struct sk_buff *skb, *skbn, *skbt;
	int received = 0;
	u16 pkt_len, sc;
	int curidx;

	if (budget <= 0)
		return received;

	/*
	 * First, grab all of the stats for the incoming packet.
	 * These get messed up if we get called due to a busy condition.
	 */
	bdp = fep->cur_rx;

	/* clear RX status bits for napi*/
	(*fep->ops->napi_clear_rx_event)(dev);

	while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {
		curidx = bdp - fep->rx_bd_base;

		/*
		 * Since we have allocated space to hold a complete frame,
		 * the last indicator should be set.
		 */
		if ((sc & BD_ENET_RX_LAST) == 0)
			dev_warn(fep->dev, "rcv is not +last\n");

		/*
		 * Check for errors.
		 */
		if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
			  BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
			fep->stats.rx_errors++;
			/* Frame too long or too short. */
			if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
				fep->stats.rx_length_errors++;
			/* Frame alignment */
			if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
				fep->stats.rx_frame_errors++;
			/* CRC Error */
			if (sc & BD_ENET_RX_CR)
				fep->stats.rx_crc_errors++;
			/* FIFO overrun */
			if (sc & BD_ENET_RX_OV)
				fep->stats.rx_crc_errors++;

			skb = fep->rx_skbuff[curidx];

			dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
				L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
				DMA_FROM_DEVICE);

			skbn = skb;

		} else {
			skb = fep->rx_skbuff[curidx];

			dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
				L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
				DMA_FROM_DEVICE);

			/*
			 * Process the incoming frame.
			 */
			fep->stats.rx_packets++;
			pkt_len = CBDR_DATLEN(bdp) - 4;	/* remove CRC */
			fep->stats.rx_bytes += pkt_len + 4;

			if (pkt_len <= fpi->rx_copybreak) {
				/* +2 to make IP header L1 cache aligned */
				skbn = netdev_alloc_skb(dev, pkt_len + 2);
				if (skbn != NULL) {
					skb_reserve(skbn, 2);	/* align IP header */
					skb_copy_from_linear_data(skb,
						      skbn->data, pkt_len);
					/* swap */
					skbt = skb;
					skb = skbn;
					skbn = skbt;
				}
			} else {
				skbn = netdev_alloc_skb(dev, ENET_RX_FRSIZE);

				if (skbn)
					skb_align(skbn, ENET_RX_ALIGN);
			}

			if (skbn != NULL) {
				skb_put(skb, pkt_len);	/* Make room */
				skb->protocol = eth_type_trans(skb, dev);
				received++;
				netif_receive_skb(skb);
			} else {
				fep->stats.rx_dropped++;
				skbn = skb;
			}
		}

		fep->rx_skbuff[curidx] = skbn;
		CBDW_BUFADDR(bdp, dma_map_single(fep->dev, skbn->data,
			     L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
			     DMA_FROM_DEVICE));
		CBDW_DATLEN(bdp, 0);
		CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);

		/*
		 * Update BD pointer to next entry.
		 */
		if ((sc & BD_ENET_RX_WRAP) == 0)
			bdp++;
		else
			bdp = fep->rx_bd_base;

		(*fep->ops->rx_bd_done)(dev);

		if (received >= budget)
			break;
	}

	fep->cur_rx = bdp;

	if (received < budget) {
		/* done */
		napi_complete(napi);
		(*fep->ops->napi_enable_rx)(dev);
	}
	return received;
}
Exemplo n.º 2
0
/* NAPI receive function */
static int fs_enet_rx_napi(struct net_device *dev, int *budget)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	const struct fs_platform_info *fpi = fep->fpi;
	cbd_t *bdp;
	struct sk_buff *skb, *skbn, *skbt;
	int received = 0;
	u16 pkt_len, sc;
	int curidx;
	int rx_work_limit = 0;	/* pacify gcc */

	rx_work_limit = min(dev->quota, *budget);

	if (!netif_running(dev))
		return 0;

	/*
	 * First, grab all of the stats for the incoming packet.
	 * These get messed up if we get called due to a busy condition.
	 */
	bdp = fep->cur_rx;

	/* clear RX status bits for napi*/
	(*fep->ops->napi_clear_rx_event)(dev);

	while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {

		curidx = bdp - fep->rx_bd_base;

		/*
		 * Since we have allocated space to hold a complete frame,
		 * the last indicator should be set.
		 */
		if ((sc & BD_ENET_RX_LAST) == 0)
			printk(KERN_WARNING DRV_MODULE_NAME
			       ": %s rcv is not +last\n",
			       dev->name);

		/*
		 * Check for errors.
		 */
		if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
			  BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
			fep->stats.rx_errors++;
			/* Frame too long or too short. */
			if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
				fep->stats.rx_length_errors++;
			/* Frame alignment */
			if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
				fep->stats.rx_frame_errors++;
			/* CRC Error */
			if (sc & BD_ENET_RX_CR)
				fep->stats.rx_crc_errors++;
			/* FIFO overrun */
			if (sc & BD_ENET_RX_OV)
				fep->stats.rx_crc_errors++;

			skb = fep->rx_skbuff[curidx];

			dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
				L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
				DMA_FROM_DEVICE);

			skbn = skb;

		} else {

			/* napi, got packet but no quota */
			if (--rx_work_limit < 0)
				break;

			skb = fep->rx_skbuff[curidx];

			dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
				L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
				DMA_FROM_DEVICE);

			/*
			 * Process the incoming frame.
			 */
			fep->stats.rx_packets++;
			pkt_len = CBDR_DATLEN(bdp) - 4;	/* remove CRC */
			fep->stats.rx_bytes += pkt_len + 4;

			if (pkt_len <= fpi->rx_copybreak) {
				/* +2 to make IP header L1 cache aligned */
				skbn = dev_alloc_skb(pkt_len + 2);
				if (skbn != NULL) {
					skb_reserve(skbn, 2);	/* align IP header */
					memcpy(skbn->data, skb->data, pkt_len);
					/* swap */
					skbt = skb;
					skb = skbn;
					skbn = skbt;
				}
			} else
				skbn = dev_alloc_skb(ENET_RX_FRSIZE);

			if (skbn != NULL) {
				skb->dev = dev;
				skb_put(skb, pkt_len);	/* Make room */
				skb->protocol = eth_type_trans(skb, dev);
				received++;
				netif_receive_skb(skb);
			} else {
				printk(KERN_WARNING DRV_MODULE_NAME
				       ": %s Memory squeeze, dropping packet.\n",
				       dev->name);
				fep->stats.rx_dropped++;
				skbn = skb;
			}
		}

		fep->rx_skbuff[curidx] = skbn;
		CBDW_BUFADDR(bdp, dma_map_single(fep->dev, skbn->data,
			     L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
			     DMA_FROM_DEVICE));
		CBDW_DATLEN(bdp, 0);
		CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);

		/*
		 * Update BD pointer to next entry.
		 */
		if ((sc & BD_ENET_RX_WRAP) == 0)
			bdp++;
		else
			bdp = fep->rx_bd_base;

		(*fep->ops->rx_bd_done)(dev);
	}

	fep->cur_rx = bdp;

	dev->quota -= received;
	*budget -= received;

	if (rx_work_limit < 0)
		return 1;	/* not done */

	/* done */
	netif_rx_complete(dev);

	(*fep->ops->napi_enable_rx)(dev);

	return 0;
}