[PATCH] sky2: fragmented receive for large MTU
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>
diff --git a/drivers/net/sky2.h b/drivers/net/sky2.h
index 403486a..f66109a 100644
--- a/drivers/net/sky2.h
+++ b/drivers/net/sky2.h
@@ -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 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 @@
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;