diff options
Diffstat (limited to 'target/linux/generic/patches-4.1/081-solos-pci-Increase-headroom-on-received-packets.patch')
| -rw-r--r-- | target/linux/generic/patches-4.1/081-solos-pci-Increase-headroom-on-received-packets.patch | 54 |
1 files changed, 0 insertions, 54 deletions
diff --git a/target/linux/generic/patches-4.1/081-solos-pci-Increase-headroom-on-received-packets.patch b/target/linux/generic/patches-4.1/081-solos-pci-Increase-headroom-on-received-packets.patch deleted file mode 100644 index 605f57a..0000000 --- a/target/linux/generic/patches-4.1/081-solos-pci-Increase-headroom-on-received-packets.patch +++ /dev/null @@ -1,54 +0,0 @@ -From: David Woodhouse <dwmw2@infradead.org> -Date: Thu, 17 Sep 2015 11:19:53 +0100 -Subject: [PATCH] solos-pci: Increase headroom on received packets -MIME-Version: 1.0 -Content-Type: text/plain; charset=UTF-8 -Content-Transfer-Encoding: 8bit - -A comment in include/linux/skbuff.h says that: - - * Various parts of the networking layer expect at least 32 bytes of - * headroom, you should not reduce this. - -This was demonstrated by a panic when handling fragmented IPv6 packets: -http://marc.info/?l=linux-netdev&m=144236093519172&w=2 - -It's not entirely clear if that comment is still valid — and if it is, -perhaps netif_rx() ought to be enforcing it with a warning. - -But either way, it is rather stupid from a performance point of view -for us to be receiving packets into a buffer which doesn't have enough -room to prepend an Ethernet header — it means that *every* incoming -packet is going to be need to be reallocated. So let's fix that. - -Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> ---- - ---- a/drivers/atm/solos-pci.c -+++ b/drivers/atm/solos-pci.c -@@ -805,7 +805,12 @@ static void solos_bh(unsigned long card_ - continue; - } - -- skb = alloc_skb(size + 1, GFP_ATOMIC); -+ /* Use netdev_alloc_skb() because it adds NET_SKB_PAD of -+ * headroom, and ensures we can route packets back out an -+ * Ethernet interface (for example) without having to -+ * reallocate. Adding NET_IP_ALIGN also ensures that both -+ * PPPoATM and PPPoEoBR2684 packets end up aligned. */ -+ skb = netdev_alloc_skb_ip_align(NULL, size + 1); - if (!skb) { - if (net_ratelimit()) - dev_warn(&card->dev->dev, "Failed to allocate sk_buff for RX\n"); -@@ -869,7 +874,10 @@ static void solos_bh(unsigned long card_ - /* Allocate RX skbs for any ports which need them */ - if (card->using_dma && card->atmdev[port] && - !card->rx_skb[port]) { -- struct sk_buff *skb = alloc_skb(RX_DMA_SIZE, GFP_ATOMIC); -+ /* Unlike the MMIO case (qv) we can't add NET_IP_ALIGN -+ * here; the FPGA can only DMA to addresses which are -+ * aligned to 4 bytes. */ -+ struct sk_buff *skb = dev_alloc_skb(RX_DMA_SIZE); - if (skb) { - SKB_CB(skb)->dma_addr = - dma_map_single(&card->dev->dev, skb->data, |