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Commit 0d63fb32 authored by Ayaz Abdulla's avatar Ayaz Abdulla Committed by Jeff Garzik
Browse files

forcedeth: rx skb recycle 



This patch removes the code that recycled the skb on error. This will
help in reducing the branches in the main data paths.

Signed-Off-By: default avatarAyaz Abdulla <aabdulla@nvidia.com>

Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent 164a86e4

drivers/net/forcedeth.c

+43 −35
Original line number Diff line number Diff line
@@ -1330,17 +1330,10 @@ static int nv_alloc_rx(struct net_device *dev) 
				break;

		}



		if (np->put_rx_ctx->skb == NULL) {



		skb = dev_alloc_skb(np->rx_buf_sz + NV_RX_ALLOC_PAD);

			if (!skb)

				return 1;



		if (skb) {

			skb->dev = dev;

			np->put_rx_ctx->skb = skb;

		} else {

			skb = np->put_rx_ctx->skb;

		}

			np->put_rx_ctx->dma = pci_map_single(np->pci_dev, skb->data,

							     skb->end-skb->data, PCI_DMA_FROMDEVICE);

			np->put_rx_ctx->dma_len = skb->end-skb->data;
@@ -1360,6 +1353,9 @@ static int nv_alloc_rx(struct net_device *dev) 
			}

			if (np->put_rx_ctx++ == np->last_rx_ctx)

				np->put_rx_ctx = np->first_rx_ctx;

		} else {

			return 1;

		}

	}

	return 0;

}
@@ -1948,6 +1944,8 @@ static int nv_rx_process(struct net_device *dev, int limit) 
		pci_unmap_single(np->pci_dev, np->get_rx_ctx->dma,

				np->get_rx_ctx->dma_len,

				PCI_DMA_FROMDEVICE);

		skb = np->get_rx_ctx->skb;

		np->get_rx_ctx->skb = NULL;



		{

			int j;
@@ -1955,39 +1953,46 @@ static int nv_rx_process(struct net_device *dev, int limit) 
			for (j=0; j<64; j++) {

				if ((j%16) == 0)

					dprintk("\n%03x:", j);

				dprintk(" %02x", ((unsigned char*)np->get_rx_ctx->skb->data)[j]);

				dprintk(" %02x", ((unsigned char*)skb->data)[j]);

			}

			dprintk("\n");

		}

		/* look at what we actually got: */

		if (np->desc_ver == DESC_VER_1) {

			if (!(flags & NV_RX_DESCRIPTORVALID))

			if (!(flags & NV_RX_DESCRIPTORVALID)) {

				dev_kfree_skb(skb);

				goto next_pkt;

			}



			if (flags & NV_RX_ERROR) {

				if (flags & NV_RX_MISSEDFRAME) {

					np->stats.rx_missed_errors++;

					np->stats.rx_errors++;

					dev_kfree_skb(skb);

					goto next_pkt;

				}

				if (flags & (NV_RX_ERROR1|NV_RX_ERROR2|NV_RX_ERROR3)) {

					np->stats.rx_errors++;

					dev_kfree_skb(skb);

					goto next_pkt;

				}

				if (flags & NV_RX_CRCERR) {

					np->stats.rx_crc_errors++;

					np->stats.rx_errors++;

					dev_kfree_skb(skb);

					goto next_pkt;

				}

				if (flags & NV_RX_OVERFLOW) {

					np->stats.rx_over_errors++;

					np->stats.rx_errors++;

					dev_kfree_skb(skb);

					goto next_pkt;

				}

				if (flags & NV_RX_ERROR4) {

					len = nv_getlen(dev, np->get_rx_ctx->skb->data, len);

					len = nv_getlen(dev, skb->data, len);

					if (len < 0) {

						np->stats.rx_errors++;

						dev_kfree_skb(skb);

						goto next_pkt;

					}

				}
@@ -1999,28 +2004,34 @@ static int nv_rx_process(struct net_device *dev, int limit) 
				}

			}

		} else {

			if (!(flags & NV_RX2_DESCRIPTORVALID))

			if (!(flags & NV_RX2_DESCRIPTORVALID)) {

				dev_kfree_skb(skb);

				goto next_pkt;

			}



			if (flags & NV_RX2_ERROR) {

				if (flags & (NV_RX2_ERROR1|NV_RX2_ERROR2|NV_RX2_ERROR3)) {

					np->stats.rx_errors++;

					dev_kfree_skb(skb);

					goto next_pkt;

				}

				if (flags & NV_RX2_CRCERR) {

					np->stats.rx_crc_errors++;

					np->stats.rx_errors++;

					dev_kfree_skb(skb);

					goto next_pkt;

				}

				if (flags & NV_RX2_OVERFLOW) {

					np->stats.rx_over_errors++;

					np->stats.rx_errors++;

					dev_kfree_skb(skb);

					goto next_pkt;

				}

				if (flags & NV_RX2_ERROR4) {

					len = nv_getlen(dev, np->get_rx_ctx->skb->data, len);

					len = nv_getlen(dev, skb->data, len);

					if (len < 0) {

						np->stats.rx_errors++;

						dev_kfree_skb(skb);

						goto next_pkt;

					}

				}
@@ -2037,16 +2048,13 @@ static int nv_rx_process(struct net_device *dev, int limit) 
				    flags == NV_RX2_CHECKSUMOK2 ||

				    flags == NV_RX2_CHECKSUMOK3) {

					dprintk(KERN_DEBUG "%s: hw checksum hit!.\n", dev->name);

					np->get_rx_ctx->skb->ip_summed = CHECKSUM_UNNECESSARY;

					skb->ip_summed = CHECKSUM_UNNECESSARY;

				} else {

					dprintk(KERN_DEBUG "%s: hwchecksum miss!.\n", dev->name);

				}

			}

		}

		/* got a valid packet - forward it to the network core */

		skb = np->get_rx_ctx->skb;

		np->get_rx_ctx->skb = NULL;



		skb_put(skb, len);

		skb->protocol = eth_type_trans(skb, dev);

		dprintk(KERN_DEBUG "%s: nv_rx_process: %d bytes, proto %d accepted.\n",