via-velocity: remove the bounce buffers

Executive summary: the bounce buffers are in my way

- they use something like a 64 * 1500 bytes area of PCI
  consistent area
- they are not resized when the MTU changes
- they are used
  - to hand-pad undersized packets. skb_pad anyone ?
  - to linearize fragmented skbs whose fragment count
    goes beyond the 7 fragments hardware limit in order
    to claim scatter-gather support

Actually the SG code is commented out and I wonder if it
could not be implemented (ab-)using the large send feature
of the chipset since the latter should support some
multi-descriptor packet transmitting.

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Fixed-by: Séguier Régis <rseguier@e-teleport.net>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/net/via-velocity.h

@@ -236,10 +236,8 @@ struct velocity_rd_info {
 
 struct velocity_td_info {
 	struct sk_buff *skb;
-	u8 *buf;
 	int nskb_dma;
 	dma_addr_t skb_dma[7];
-	dma_addr_t buf_dma;
 };
 
 enum  velocity_owner {
@@ -1506,9 +1504,6 @@ struct velocity_info {
 	dma_addr_t rd_pool_dma;
 	dma_addr_t td_pool_dma[TX_QUEUE_NO];
 
-	dma_addr_t tx_bufs_dma;
-	u8 *tx_bufs;
-
 	struct vlan_group    *vlgrp;
 	u8 ip_addr[4];
 	enum chip_type chip_id;