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[PATCH] sky2: fragmented receive for large MTU

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Use hardware support for chained receive to break up large frames
into multiple pages. This avoids having to do a mult-page allocation
that can fail on a busy system due to fragmented memory.

For normal size MTU, this code behaves the same.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Stephen Hemminger
2006-09-26 11:57:43 -07:00
committed by Jeff Garzik
parent 2bb8c26242
commit 14d0263fea
2 changed files with 220 additions and 82 deletions
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10
drivers/net/sky2.h
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@@ -4,6 +4,8 @@
#ifndef _SKY2_H
#define _SKY2_H
#define ETH_JUMBO_MTU 9000 /* Maximum MTU supported */
/* PCI device specific config registers */
enum {
PCI_DEV_REG1 = 0x40,
@@ -1779,7 +1781,9 @@ struct tx_ring_info {
struct rx_ring_info {
struct sk_buff *skb;
dma_addr_t mapaddr;
dma_addr_t data_addr;
DECLARE_PCI_UNMAP_ADDR(data_size);
dma_addr_t frag_addr[ETH_JUMBO_MTU >> PAGE_SHIFT];
};
struct sky2_port {
@@ -1804,7 +1808,9 @@ struct sky2_port {
u16 rx_next; /* next re to check */
u16 rx_put; /* next le index to use */
u16 rx_pending;
u16 rx_bufsize;
u16 rx_data_size;
u16 rx_nfrags;
#ifdef SKY2_VLAN_TAG_USED
u16 rx_tag;
struct vlan_group *vlgrp;