mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-26 08:51:13 +00:00
55 lines
2.2 KiB
Diff
55 lines
2.2 KiB
Diff
|
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 =
|
||
|
|
pci_map_single(card->dev, skb->data,
|