Exemplo n.º 1
0
static netdev_tx_t
greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct greth_private *greth = netdev_priv(dev);
	struct greth_bd *bdp;
	int err = NETDEV_TX_OK;
	u32 status, dma_addr, ctrl;
	unsigned long flags;

	/* Clean TX Ring */
	greth_clean_tx(greth->netdev);

	if (unlikely(greth->tx_free <= 0)) {
		spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
		ctrl = GRETH_REGLOAD(greth->regs->control);
		/* Enable TX IRQ only if not already in poll() routine */
		if (ctrl & GRETH_RXI)
			GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
		netif_stop_queue(dev);
		spin_unlock_irqrestore(&greth->devlock, flags);
		return NETDEV_TX_BUSY;
	}

	if (netif_msg_pktdata(greth))
		greth_print_tx_packet(skb);


	if (unlikely(skb->len > MAX_FRAME_SIZE)) {
		dev->stats.tx_errors++;
		goto out;
	}

	bdp = greth->tx_bd_base + greth->tx_next;
	dma_addr = greth_read_bd(&bdp->addr);

	memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);

	dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);

	status = GRETH_BD_EN | GRETH_BD_IE | (skb->len & GRETH_BD_LEN);
	greth->tx_bufs_length[greth->tx_next] = skb->len & GRETH_BD_LEN;

	/* Wrap around descriptor ring */
	if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
		status |= GRETH_BD_WR;
	}

	greth->tx_next = NEXT_TX(greth->tx_next);
	greth->tx_free--;

	/* Write descriptor control word and enable transmission */
	greth_write_bd(&bdp->stat, status);
	spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
	greth_enable_tx(greth);
	spin_unlock_irqrestore(&greth->devlock, flags);

out:
	dev_kfree_skb(skb);
	return err;
}
Exemplo n.º 2
0
static int greth_rx_gbit(struct net_device *dev, int limit)
{
	struct greth_private *greth;
	struct greth_bd *bdp;
	struct sk_buff *skb, *newskb;
	int pkt_len;
	int bad, count = 0;
	u32 status, dma_addr;
	unsigned long flags;

	greth = netdev_priv(dev);

	for (count = 0; count < limit; ++count) {

		bdp = greth->rx_bd_base + greth->rx_cur;
		skb = greth->rx_skbuff[greth->rx_cur];
		GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
		mb();
		status = greth_read_bd(&bdp->stat);
		bad = 0;

		if (status & GRETH_BD_EN)
			break;

		/* Check status for errors. */
		if (unlikely(status & GRETH_RXBD_STATUS)) {

			if (status & GRETH_RXBD_ERR_FT) {
				dev->stats.rx_length_errors++;
				bad = 1;
			} else if (status &
				   (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
				dev->stats.rx_frame_errors++;
				bad = 1;
			} else if (status & GRETH_RXBD_ERR_CRC) {
				dev->stats.rx_crc_errors++;
				bad = 1;
			}
		}

		/* Allocate new skb to replace current, not needed if the
		 * current skb can be reused */
		if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
			skb_reserve(newskb, NET_IP_ALIGN);

			dma_addr = dma_map_single(greth->dev,
						      newskb->data,
						      MAX_FRAME_SIZE + NET_IP_ALIGN,
						      DMA_FROM_DEVICE);

			if (!dma_mapping_error(greth->dev, dma_addr)) {
				/* Process the incoming frame. */
				pkt_len = status & GRETH_BD_LEN;

				dma_unmap_single(greth->dev,
						 greth_read_bd(&bdp->addr),
						 MAX_FRAME_SIZE + NET_IP_ALIGN,
						 DMA_FROM_DEVICE);

				if (netif_msg_pktdata(greth))
					greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);

				skb_put(skb, pkt_len);

				if (dev->features & NETIF_F_RXCSUM && hw_checksummed(status))
					skb->ip_summed = CHECKSUM_UNNECESSARY;
				else
					skb_checksum_none_assert(skb);

				skb->protocol = eth_type_trans(skb, dev);
				dev->stats.rx_packets++;
				dev->stats.rx_bytes += pkt_len;
				netif_receive_skb(skb);

				greth->rx_skbuff[greth->rx_cur] = newskb;
				greth_write_bd(&bdp->addr, dma_addr);
			} else {
				if (net_ratelimit())
					dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
				dev_kfree_skb(newskb);
				/* reusing current skb, so it is a drop */
				dev->stats.rx_dropped++;
			}
		} else if (bad) {
			/* Bad Frame transfer, the skb is reused */
			dev->stats.rx_dropped++;
		} else {
			/* Failed Allocating a new skb. This is rather stupid
			 * but the current "filled" skb is reused, as if
			 * transfer failure. One could argue that RX descriptor
			 * table handling should be divided into cleaning and
			 * filling as the TX part of the driver
			 */
			if (net_ratelimit())
				dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
			/* reusing current skb, so it is a drop */
			dev->stats.rx_dropped++;
		}

		status = GRETH_BD_EN | GRETH_BD_IE;
		if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
			status |= GRETH_BD_WR;
		}

		wmb();
		greth_write_bd(&bdp->stat, status);
		spin_lock_irqsave(&greth->devlock, flags);
		greth_enable_rx(greth);
		spin_unlock_irqrestore(&greth->devlock, flags);
		greth->rx_cur = NEXT_RX(greth->rx_cur);
	}

	return count;

}
Exemplo n.º 3
0
static int greth_rx(struct net_device *dev, int limit)
{
	struct greth_private *greth;
	struct greth_bd *bdp;
	struct sk_buff *skb;
	int pkt_len;
	int bad, count;
	u32 status, dma_addr;
	unsigned long flags;

	greth = netdev_priv(dev);

	for (count = 0; count < limit; ++count) {

		bdp = greth->rx_bd_base + greth->rx_cur;
		GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
		mb();
		status = greth_read_bd(&bdp->stat);

		if (unlikely(status & GRETH_BD_EN)) {
			break;
		}

		dma_addr = greth_read_bd(&bdp->addr);
		bad = 0;

		/* Check status for errors. */
		if (unlikely(status & GRETH_RXBD_STATUS)) {
			if (status & GRETH_RXBD_ERR_FT) {
				dev->stats.rx_length_errors++;
				bad = 1;
			}
			if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
				dev->stats.rx_frame_errors++;
				bad = 1;
			}
			if (status & GRETH_RXBD_ERR_CRC) {
				dev->stats.rx_crc_errors++;
				bad = 1;
			}
		}
		if (unlikely(bad)) {
			dev->stats.rx_errors++;

		} else {

			pkt_len = status & GRETH_BD_LEN;

			skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);

			if (unlikely(skb == NULL)) {

				if (net_ratelimit())
					dev_warn(&dev->dev, "low on memory - " "packet dropped\n");

				dev->stats.rx_dropped++;

			} else {
				skb_reserve(skb, NET_IP_ALIGN);

				dma_sync_single_for_cpu(greth->dev,
							dma_addr,
							pkt_len,
							DMA_FROM_DEVICE);

				if (netif_msg_pktdata(greth))
					greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);

				memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len);

				skb->protocol = eth_type_trans(skb, dev);
				dev->stats.rx_bytes += pkt_len;
				dev->stats.rx_packets++;
				netif_receive_skb(skb);
			}
		}

		status = GRETH_BD_EN | GRETH_BD_IE;
		if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
			status |= GRETH_BD_WR;
		}

		wmb();
		greth_write_bd(&bdp->stat, status);

		dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);

		spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */
		greth_enable_rx(greth);
		spin_unlock_irqrestore(&greth->devlock, flags);

		greth->rx_cur = NEXT_RX(greth->rx_cur);
	}

	return count;
}
Exemplo n.º 4
0
static netdev_tx_t
greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
{
	struct greth_private *greth = netdev_priv(dev);
	struct greth_bd *bdp;
	u32 status, dma_addr;
	int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
	unsigned long flags;
	u16 tx_last;

	nr_frags = skb_shinfo(skb)->nr_frags;
	tx_last = greth->tx_last;
	rmb(); /* tx_last is updated by the poll task */

	if (greth_num_free_bds(tx_last, greth->tx_next) < nr_frags + 1) {
		netif_stop_queue(dev);
		err = NETDEV_TX_BUSY;
		goto out;
	}

	if (netif_msg_pktdata(greth))
		greth_print_tx_packet(skb);

	if (unlikely(skb->len > MAX_FRAME_SIZE)) {
		dev->stats.tx_errors++;
		goto out;
	}

	/* Save skb pointer. */
	greth->tx_skbuff[greth->tx_next] = skb;

	/* Linear buf */
	if (nr_frags != 0)
		status = GRETH_TXBD_MORE;
	else
		status = GRETH_BD_IE;

	if (skb->ip_summed == CHECKSUM_PARTIAL)
		status |= GRETH_TXBD_CSALL;
	status |= skb_headlen(skb) & GRETH_BD_LEN;
	if (greth->tx_next == GRETH_TXBD_NUM_MASK)
		status |= GRETH_BD_WR;


	bdp = greth->tx_bd_base + greth->tx_next;
	greth_write_bd(&bdp->stat, status);
	dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);

	if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
		goto map_error;

	greth_write_bd(&bdp->addr, dma_addr);

	curr_tx = NEXT_TX(greth->tx_next);

	/* Frags */
	for (i = 0; i < nr_frags; i++) {
		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
		greth->tx_skbuff[curr_tx] = NULL;
		bdp = greth->tx_bd_base + curr_tx;

		status = GRETH_BD_EN;
		if (skb->ip_summed == CHECKSUM_PARTIAL)
			status |= GRETH_TXBD_CSALL;
		status |= skb_frag_size(frag) & GRETH_BD_LEN;

		/* Wrap around descriptor ring */
		if (curr_tx == GRETH_TXBD_NUM_MASK)
			status |= GRETH_BD_WR;

		/* More fragments left */
		if (i < nr_frags - 1)
			status |= GRETH_TXBD_MORE;
		else
			status |= GRETH_BD_IE; /* enable IRQ on last fragment */

		greth_write_bd(&bdp->stat, status);

		dma_addr = skb_frag_dma_map(greth->dev, frag, 0, skb_frag_size(frag),
					    DMA_TO_DEVICE);

		if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
			goto frag_map_error;

		greth_write_bd(&bdp->addr, dma_addr);

		curr_tx = NEXT_TX(curr_tx);
	}

	wmb();

	/* Enable the descriptor chain by enabling the first descriptor */
	bdp = greth->tx_bd_base + greth->tx_next;
	greth_write_bd(&bdp->stat,
		       greth_read_bd(&bdp->stat) | GRETH_BD_EN);

	spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
	greth->tx_next = curr_tx;
	greth_enable_tx_and_irq(greth);
	spin_unlock_irqrestore(&greth->devlock, flags);

	return NETDEV_TX_OK;

frag_map_error:
	/* Unmap SKB mappings that succeeded and disable descriptor */
	for (i = 0; greth->tx_next + i != curr_tx; i++) {
		bdp = greth->tx_bd_base + greth->tx_next + i;
		dma_unmap_single(greth->dev,
				 greth_read_bd(&bdp->addr),
				 greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
				 DMA_TO_DEVICE);
		greth_write_bd(&bdp->stat, 0);
	}
map_error:
	if (net_ratelimit())
		dev_warn(greth->dev, "Could not create TX DMA mapping\n");
	dev_kfree_skb(skb);
out:
	return err;
}
Exemplo n.º 5
0
static int greth_init_rings(struct greth_private *greth)
{
	struct sk_buff *skb;
	struct greth_bd *rx_bd, *tx_bd;
	u32 dma_addr;
	int i;

	rx_bd = greth->rx_bd_base;
	tx_bd = greth->tx_bd_base;

	/* Initialize descriptor rings and buffers */
	if (greth->gbit_mac) {

		for (i = 0; i < GRETH_RXBD_NUM; i++) {
			skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
			if (skb == NULL) {
				if (netif_msg_ifup(greth))
					dev_err(greth->dev, "Error allocating DMA ring.\n");
				goto cleanup;
			}
			skb_reserve(skb, NET_IP_ALIGN);
			dma_addr = dma_map_single(greth->dev,
						  skb->data,
						  MAX_FRAME_SIZE+NET_IP_ALIGN,
						  DMA_FROM_DEVICE);

			if (dma_mapping_error(greth->dev, dma_addr)) {
				if (netif_msg_ifup(greth))
					dev_err(greth->dev, "Could not create initial DMA mapping\n");
				goto cleanup;
			}
			greth->rx_skbuff[i] = skb;
			greth_write_bd(&rx_bd[i].addr, dma_addr);
			greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
		}

	} else {

		/* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
		for (i = 0; i < GRETH_RXBD_NUM; i++) {

			greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);

			if (greth->rx_bufs[i] == NULL) {
				if (netif_msg_ifup(greth))
					dev_err(greth->dev, "Error allocating DMA ring.\n");
				goto cleanup;
			}

			dma_addr = dma_map_single(greth->dev,
						  greth->rx_bufs[i],
						  MAX_FRAME_SIZE,
						  DMA_FROM_DEVICE);

			if (dma_mapping_error(greth->dev, dma_addr)) {
				if (netif_msg_ifup(greth))
					dev_err(greth->dev, "Could not create initial DMA mapping\n");
				goto cleanup;
			}
			greth_write_bd(&rx_bd[i].addr, dma_addr);
			greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
		}
		for (i = 0; i < GRETH_TXBD_NUM; i++) {

			greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);

			if (greth->tx_bufs[i] == NULL) {
				if (netif_msg_ifup(greth))
					dev_err(greth->dev, "Error allocating DMA ring.\n");
				goto cleanup;
			}

			dma_addr = dma_map_single(greth->dev,
						  greth->tx_bufs[i],
						  MAX_FRAME_SIZE,
						  DMA_TO_DEVICE);

			if (dma_mapping_error(greth->dev, dma_addr)) {
				if (netif_msg_ifup(greth))
					dev_err(greth->dev, "Could not create initial DMA mapping\n");
				goto cleanup;
			}
			greth_write_bd(&tx_bd[i].addr, dma_addr);
			greth_write_bd(&tx_bd[i].stat, 0);
		}
	}
	greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
		       greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);

	/* Initialize pointers. */
	greth->rx_cur = 0;
	greth->tx_next = 0;
	greth->tx_last = 0;
	greth->tx_free = GRETH_TXBD_NUM;

	/* Initialize descriptor base address */
	GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
	GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);

	return 0;

cleanup:
	greth_clean_rings(greth);
	return -ENOMEM;
}
Exemplo n.º 6
0
static netdev_tx_t
greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
{
	struct greth_private *greth = netdev_priv(dev);
	struct greth_bd *bdp;
	u32 status = 0, dma_addr, ctrl;
	int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
	unsigned long flags;

	nr_frags = skb_shinfo(skb)->nr_frags;

	/* Clean TX Ring */
	greth_clean_tx_gbit(dev);

	if (greth->tx_free < nr_frags + 1) {
		spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
		ctrl = GRETH_REGLOAD(greth->regs->control);
		/* Enable TX IRQ only if not already in poll() routine */
		if (ctrl & GRETH_RXI)
			GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
		netif_stop_queue(dev);
		spin_unlock_irqrestore(&greth->devlock, flags);
		err = NETDEV_TX_BUSY;
		goto out;
	}

	if (netif_msg_pktdata(greth))
		greth_print_tx_packet(skb);

	if (unlikely(skb->len > MAX_FRAME_SIZE)) {
		dev->stats.tx_errors++;
		goto out;
	}

	/* Save skb pointer. */
	greth->tx_skbuff[greth->tx_next] = skb;

	/* Linear buf */
	if (nr_frags != 0)
		status = GRETH_TXBD_MORE;

	status |= GRETH_TXBD_CSALL;
	status |= skb_headlen(skb) & GRETH_BD_LEN;
	if (greth->tx_next == GRETH_TXBD_NUM_MASK)
		status |= GRETH_BD_WR;


	bdp = greth->tx_bd_base + greth->tx_next;
	greth_write_bd(&bdp->stat, status);
	dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);

	if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
		goto map_error;

	greth_write_bd(&bdp->addr, dma_addr);

	curr_tx = NEXT_TX(greth->tx_next);

	/* Frags */
	for (i = 0; i < nr_frags; i++) {
		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
		greth->tx_skbuff[curr_tx] = NULL;
		bdp = greth->tx_bd_base + curr_tx;

		status = GRETH_TXBD_CSALL | GRETH_BD_EN;
		status |= frag->size & GRETH_BD_LEN;

		/* Wrap around descriptor ring */
		if (curr_tx == GRETH_TXBD_NUM_MASK)
			status |= GRETH_BD_WR;

		/* More fragments left */
		if (i < nr_frags - 1)
			status |= GRETH_TXBD_MORE;
		else
			status |= GRETH_BD_IE; /* enable IRQ on last fragment */

		greth_write_bd(&bdp->stat, status);

		dma_addr = dma_map_page(greth->dev,
					frag->page,
					frag->page_offset,
					frag->size,
					DMA_TO_DEVICE);

		if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
			goto frag_map_error;

		greth_write_bd(&bdp->addr, dma_addr);

		curr_tx = NEXT_TX(curr_tx);
	}

	wmb();

	/* Enable the descriptor chain by enabling the first descriptor */
	bdp = greth->tx_bd_base + greth->tx_next;
	greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
	greth->tx_next = curr_tx;
	greth->tx_free -= nr_frags + 1;

	wmb();

	spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
	greth_enable_tx(greth);
	spin_unlock_irqrestore(&greth->devlock, flags);

	return NETDEV_TX_OK;

frag_map_error:
	/* Unmap SKB mappings that succeeded and disable descriptor */
	for (i = 0; greth->tx_next + i != curr_tx; i++) {
		bdp = greth->tx_bd_base + greth->tx_next + i;
		dma_unmap_single(greth->dev,
				 greth_read_bd(&bdp->addr),
				 greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
				 DMA_TO_DEVICE);
		greth_write_bd(&bdp->stat, 0);
	}
map_error:
	if (net_ratelimit())
		dev_warn(greth->dev, "Could not create TX DMA mapping\n");
	dev_kfree_skb(skb);
out:
	return err;
}
Exemplo n.º 7
0
static int greth_rx_gbit(struct net_device *dev, int limit)
{
	struct greth_private *greth;
	struct greth_bd *bdp;
	struct sk_buff *skb, *newskb;
	int pkt_len;
	int bad, count = 0;
	u32 status, dma_addr;

	greth = netdev_priv(dev);

	for (count = 0; count < limit; ++count) {

		bdp = greth->rx_bd_base + greth->rx_cur;
		skb = greth->rx_skbuff[greth->rx_cur];
		status = greth_read_bd(&bdp->stat);
		bad = 0;

		if (status & GRETH_BD_EN)
			break;

		/* Check status for errors. */
		if (unlikely(status & GRETH_RXBD_STATUS)) {

			if (status & GRETH_RXBD_ERR_FT) {
				dev->stats.rx_length_errors++;
				bad = 1;
			} else if (status &
				   (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
				dev->stats.rx_frame_errors++;
				bad = 1;
			} else if (status & GRETH_RXBD_ERR_CRC) {
				dev->stats.rx_crc_errors++;
				bad = 1;
			}
		}

		/* Allocate new skb to replace current */
		newskb = netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN);

		if (!bad && newskb) {
			skb_reserve(newskb, NET_IP_ALIGN);

			dma_addr = dma_map_single(greth->dev,
						      newskb->data,
						      MAX_FRAME_SIZE + NET_IP_ALIGN,
						      DMA_FROM_DEVICE);

			if (!dma_mapping_error(greth->dev, dma_addr)) {
				/* Process the incoming frame. */
				pkt_len = status & GRETH_BD_LEN;

				dma_unmap_single(greth->dev,
						 greth_read_bd(&bdp->addr),
						 MAX_FRAME_SIZE + NET_IP_ALIGN,
						 DMA_FROM_DEVICE);

				if (netif_msg_pktdata(greth))
					greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);

				skb_put(skb, pkt_len);

				if (greth->flags & GRETH_FLAG_RX_CSUM && hw_checksummed(status))
					skb->ip_summed = CHECKSUM_UNNECESSARY;
				else
					skb->ip_summed = CHECKSUM_NONE;

				skb->protocol = eth_type_trans(skb, dev);
				dev->stats.rx_packets++;
				netif_receive_skb(skb);

				greth->rx_skbuff[greth->rx_cur] = newskb;
				greth_write_bd(&bdp->addr, dma_addr);
			} else {
				if (net_ratelimit())
					dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
				dev_kfree_skb(newskb);
				dev->stats.rx_dropped++;
			}
		} else {
			if (net_ratelimit())
				dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
			dev->stats.rx_dropped++;
		}

		status = GRETH_BD_EN | GRETH_BD_IE;
		if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
			status |= GRETH_BD_WR;
		}

		wmb();
		greth_write_bd(&bdp->stat, status);
		greth_enable_rx(greth);
		greth->rx_cur = NEXT_RX(greth->rx_cur);
	}

	return count;

}
Exemplo n.º 8
0
static netdev_tx_t
greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
{
	struct greth_private *greth = netdev_priv(dev);
	struct greth_bd *bdp;
	u32 status = 0, dma_addr;
	int curr_tx, nr_frags, i, err = NETDEV_TX_OK;

	nr_frags = skb_shinfo(skb)->nr_frags;

	if (greth->tx_free < nr_frags + 1) {
		netif_stop_queue(dev);
		err = NETDEV_TX_BUSY;
		goto out;
	}

	if (netif_msg_pktdata(greth))
		greth_print_tx_packet(skb);

	if (unlikely(skb->len > MAX_FRAME_SIZE)) {
		dev->stats.tx_errors++;
		goto out;
	}

	/* Save skb pointer. */
	greth->tx_skbuff[greth->tx_next] = skb;

	/* Linear buf */
	if (nr_frags != 0)
		status = GRETH_TXBD_MORE;

	status |= GRETH_TXBD_CSALL;
	status |= skb_headlen(skb) & GRETH_BD_LEN;
	if (greth->tx_next == GRETH_TXBD_NUM_MASK)
		status |= GRETH_BD_WR;


	bdp = greth->tx_bd_base + greth->tx_next;
	greth_write_bd(&bdp->stat, status);
	dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);

	if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
		goto map_error;

	greth_write_bd(&bdp->addr, dma_addr);

	curr_tx = NEXT_TX(greth->tx_next);

	/* Frags */
	for (i = 0; i < nr_frags; i++) {
		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
		greth->tx_skbuff[curr_tx] = NULL;
		bdp = greth->tx_bd_base + curr_tx;

		status = GRETH_TXBD_CSALL;
		status |= frag->size & GRETH_BD_LEN;

		/* Wrap around descriptor ring */
		if (curr_tx == GRETH_TXBD_NUM_MASK)
			status |= GRETH_BD_WR;

		/* More fragments left */
		if (i < nr_frags - 1)
			status |= GRETH_TXBD_MORE;

		/* ... last fragment, check if out of descriptors  */
		else if (greth->tx_free - nr_frags - 1 < (MAX_SKB_FRAGS + 1)) {

			/* Enable interrupts and stop queue */
			status |= GRETH_BD_IE;
			netif_stop_queue(dev);
		}

		greth_write_bd(&bdp->stat, status);

		dma_addr = dma_map_page(greth->dev,
					frag->page,
					frag->page_offset,
					frag->size,
					DMA_TO_DEVICE);

		if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
			goto frag_map_error;

		greth_write_bd(&bdp->addr, dma_addr);

		curr_tx = NEXT_TX(curr_tx);
	}

	wmb();

	/* Enable the descriptors that we configured ...  */
	for (i = 0; i < nr_frags + 1; i++) {
		bdp = greth->tx_bd_base + greth->tx_next;
		greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
		greth->tx_next = NEXT_TX(greth->tx_next);
		greth->tx_free--;
	}

	greth_enable_tx(greth);

	return NETDEV_TX_OK;

frag_map_error:
	/* Unmap SKB mappings that succeeded */
	for (i = 0; greth->tx_next + i != curr_tx; i++) {
		bdp = greth->tx_bd_base + greth->tx_next + i;
		dma_unmap_single(greth->dev,
				 greth_read_bd(&bdp->addr),
				 greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
				 DMA_TO_DEVICE);
	}
map_error:
	if (net_ratelimit())
		dev_warn(greth->dev, "Could not create TX DMA mapping\n");
	dev_kfree_skb(skb);
out:
	return err;
}
Exemplo n.º 9
0
static netdev_tx_t
greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct greth_private *greth = netdev_priv(dev);
	struct greth_bd *bdp;
	int err = NETDEV_TX_OK;
	u32 status, dma_addr;

	bdp = greth->tx_bd_base + greth->tx_next;

	if (unlikely(greth->tx_free <= 0)) {
		netif_stop_queue(dev);
		return NETDEV_TX_BUSY;
	}

	if (netif_msg_pktdata(greth))
		greth_print_tx_packet(skb);


	if (unlikely(skb->len > MAX_FRAME_SIZE)) {
		dev->stats.tx_errors++;
		goto out;
	}

	dma_addr = greth_read_bd(&bdp->addr);

	memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);

	dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);

	status = GRETH_BD_EN | (skb->len & GRETH_BD_LEN);

	/* Wrap around descriptor ring */
	if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
		status |= GRETH_BD_WR;
	}

	greth->tx_next = NEXT_TX(greth->tx_next);
	greth->tx_free--;

	/* No more descriptors */
	if (unlikely(greth->tx_free == 0)) {

		/* Free transmitted descriptors */
		greth_clean_tx(dev);

		/* If nothing was cleaned, stop queue & wait for irq */
		if (unlikely(greth->tx_free == 0)) {
			status |= GRETH_BD_IE;
			netif_stop_queue(dev);
		}
	}

	/* Write descriptor control word and enable transmission */
	greth_write_bd(&bdp->stat, status);
	greth_enable_tx(greth);

out:
	dev_kfree_skb(skb);
	return err;
}