[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>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/net/sky2.h b/drivers/net/sky2.h
index 403486a3831d..f66109a96d95 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 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;