d58ff35122
It seems like a historic accident that these return unsigned char *,
and in many places that means casts are required, more often than not.
Make these functions return void * and remove all the casts across
the tree, adding a (u8 *) cast only where the unsigned char pointer
was used directly, all done with the following spatch:
@@
expression SKB, LEN;
typedef u8;
identifier fn = { skb_push, __skb_push, skb_push_rcsum };
@@
- *(fn(SKB, LEN))
+ *(u8 *)fn(SKB, LEN)
@@
expression E, SKB, LEN;
identifier fn = { skb_push, __skb_push, skb_push_rcsum };
type T;
@@
- E = ((T *)(fn(SKB, LEN)))
+ E = fn(SKB, LEN)
@@
expression SKB, LEN;
identifier fn = { skb_push, __skb_push, skb_push_rcsum };
@@
- fn(SKB, LEN)[0]
+ *(u8 *)fn(SKB, LEN)
Note that the last part there converts from push(...)[0] to the
more idiomatic *(u8 *)push(...).
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
243 lines
6.3 KiB
C
243 lines
6.3 KiB
C
/*
|
|
* Linux ARCnet driver - RFC1051 ("simple" standard) packet encapsulation
|
|
*
|
|
* Written 1994-1999 by Avery Pennarun.
|
|
* Derived from skeleton.c by Donald Becker.
|
|
*
|
|
* Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
|
|
* for sponsoring the further development of this driver.
|
|
*
|
|
* **********************
|
|
*
|
|
* The original copyright of skeleton.c was as follows:
|
|
*
|
|
* skeleton.c Written 1993 by Donald Becker.
|
|
* Copyright 1993 United States Government as represented by the
|
|
* Director, National Security Agency. This software may only be used
|
|
* and distributed according to the terms of the GNU General Public License as
|
|
* modified by SRC, incorporated herein by reference.
|
|
*
|
|
* **********************
|
|
*
|
|
* For more details, see drivers/net/arcnet.c
|
|
*
|
|
* **********************
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/init.h>
|
|
#include <linux/if_arp.h>
|
|
#include <net/arp.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/skbuff.h>
|
|
|
|
#include "arcdevice.h"
|
|
|
|
static __be16 type_trans(struct sk_buff *skb, struct net_device *dev);
|
|
static void rx(struct net_device *dev, int bufnum,
|
|
struct archdr *pkthdr, int length);
|
|
static int build_header(struct sk_buff *skb, struct net_device *dev,
|
|
unsigned short type, uint8_t daddr);
|
|
static int prepare_tx(struct net_device *dev, struct archdr *pkt, int length,
|
|
int bufnum);
|
|
|
|
static struct ArcProto rfc1051_proto = {
|
|
.suffix = 's',
|
|
.mtu = XMTU - RFC1051_HDR_SIZE,
|
|
.is_ip = 1,
|
|
.rx = rx,
|
|
.build_header = build_header,
|
|
.prepare_tx = prepare_tx,
|
|
.continue_tx = NULL,
|
|
.ack_tx = NULL
|
|
};
|
|
|
|
static int __init arcnet_rfc1051_init(void)
|
|
{
|
|
pr_info("%s\n", "RFC1051 \"simple standard\" (`s') encapsulation support loaded");
|
|
|
|
arc_proto_map[ARC_P_IP_RFC1051]
|
|
= arc_proto_map[ARC_P_ARP_RFC1051]
|
|
= &rfc1051_proto;
|
|
|
|
/* if someone else already owns the broadcast, we won't take it */
|
|
if (arc_bcast_proto == arc_proto_default)
|
|
arc_bcast_proto = &rfc1051_proto;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit arcnet_rfc1051_exit(void)
|
|
{
|
|
arcnet_unregister_proto(&rfc1051_proto);
|
|
}
|
|
|
|
module_init(arcnet_rfc1051_init);
|
|
module_exit(arcnet_rfc1051_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
/* Determine a packet's protocol ID.
|
|
*
|
|
* With ARCnet we have to convert everything to Ethernet-style stuff.
|
|
*/
|
|
static __be16 type_trans(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct archdr *pkt = (struct archdr *)skb->data;
|
|
struct arc_rfc1051 *soft = &pkt->soft.rfc1051;
|
|
int hdr_size = ARC_HDR_SIZE + RFC1051_HDR_SIZE;
|
|
|
|
/* Pull off the arcnet header. */
|
|
skb_reset_mac_header(skb);
|
|
skb_pull(skb, hdr_size);
|
|
|
|
if (pkt->hard.dest == 0) {
|
|
skb->pkt_type = PACKET_BROADCAST;
|
|
} else if (dev->flags & IFF_PROMISC) {
|
|
/* if we're not sending to ourselves :) */
|
|
if (pkt->hard.dest != dev->dev_addr[0])
|
|
skb->pkt_type = PACKET_OTHERHOST;
|
|
}
|
|
/* now return the protocol number */
|
|
switch (soft->proto) {
|
|
case ARC_P_IP_RFC1051:
|
|
return htons(ETH_P_IP);
|
|
case ARC_P_ARP_RFC1051:
|
|
return htons(ETH_P_ARP);
|
|
|
|
default:
|
|
dev->stats.rx_errors++;
|
|
dev->stats.rx_crc_errors++;
|
|
return 0;
|
|
}
|
|
|
|
return htons(ETH_P_IP);
|
|
}
|
|
|
|
/* packet receiver */
|
|
static void rx(struct net_device *dev, int bufnum,
|
|
struct archdr *pkthdr, int length)
|
|
{
|
|
struct arcnet_local *lp = netdev_priv(dev);
|
|
struct sk_buff *skb;
|
|
struct archdr *pkt = pkthdr;
|
|
int ofs;
|
|
|
|
arc_printk(D_DURING, dev, "it's a raw packet (length=%d)\n", length);
|
|
|
|
if (length >= MinTU)
|
|
ofs = 512 - length;
|
|
else
|
|
ofs = 256 - length;
|
|
|
|
skb = alloc_skb(length + ARC_HDR_SIZE, GFP_ATOMIC);
|
|
if (!skb) {
|
|
dev->stats.rx_dropped++;
|
|
return;
|
|
}
|
|
skb_put(skb, length + ARC_HDR_SIZE);
|
|
skb->dev = dev;
|
|
|
|
pkt = (struct archdr *)skb->data;
|
|
|
|
/* up to sizeof(pkt->soft) has already been copied from the card */
|
|
memcpy(pkt, pkthdr, sizeof(struct archdr));
|
|
if (length > sizeof(pkt->soft))
|
|
lp->hw.copy_from_card(dev, bufnum, ofs + sizeof(pkt->soft),
|
|
pkt->soft.raw + sizeof(pkt->soft),
|
|
length - sizeof(pkt->soft));
|
|
|
|
if (BUGLVL(D_SKB))
|
|
arcnet_dump_skb(dev, skb, "rx");
|
|
|
|
skb->protocol = type_trans(skb, dev);
|
|
netif_rx(skb);
|
|
}
|
|
|
|
/* Create the ARCnet hard/soft headers for RFC1051 */
|
|
static int build_header(struct sk_buff *skb, struct net_device *dev,
|
|
unsigned short type, uint8_t daddr)
|
|
{
|
|
int hdr_size = ARC_HDR_SIZE + RFC1051_HDR_SIZE;
|
|
struct archdr *pkt = skb_push(skb, hdr_size);
|
|
struct arc_rfc1051 *soft = &pkt->soft.rfc1051;
|
|
|
|
/* set the protocol ID according to RFC1051 */
|
|
switch (type) {
|
|
case ETH_P_IP:
|
|
soft->proto = ARC_P_IP_RFC1051;
|
|
break;
|
|
case ETH_P_ARP:
|
|
soft->proto = ARC_P_ARP_RFC1051;
|
|
break;
|
|
default:
|
|
arc_printk(D_NORMAL, dev, "RFC1051: I don't understand protocol %d (%Xh)\n",
|
|
type, type);
|
|
dev->stats.tx_errors++;
|
|
dev->stats.tx_aborted_errors++;
|
|
return 0;
|
|
}
|
|
|
|
/* Set the source hardware address.
|
|
*
|
|
* This is pretty pointless for most purposes, but it can help in
|
|
* debugging. ARCnet does not allow us to change the source address
|
|
* in the actual packet sent.
|
|
*/
|
|
pkt->hard.source = *dev->dev_addr;
|
|
|
|
/* see linux/net/ethernet/eth.c to see where I got the following */
|
|
|
|
if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) {
|
|
/* FIXME: fill in the last byte of the dest ipaddr here to
|
|
* better comply with RFC1051 in "noarp" mode.
|
|
*/
|
|
pkt->hard.dest = 0;
|
|
return hdr_size;
|
|
}
|
|
/* otherwise, just fill it in and go! */
|
|
pkt->hard.dest = daddr;
|
|
|
|
return hdr_size; /* success */
|
|
}
|
|
|
|
static int prepare_tx(struct net_device *dev, struct archdr *pkt, int length,
|
|
int bufnum)
|
|
{
|
|
struct arcnet_local *lp = netdev_priv(dev);
|
|
struct arc_hardware *hard = &pkt->hard;
|
|
int ofs;
|
|
|
|
arc_printk(D_DURING, dev, "prepare_tx: txbufs=%d/%d/%d\n",
|
|
lp->next_tx, lp->cur_tx, bufnum);
|
|
|
|
/* hard header is not included in packet length */
|
|
length -= ARC_HDR_SIZE;
|
|
|
|
if (length > XMTU) {
|
|
/* should never happen! other people already check for this. */
|
|
arc_printk(D_NORMAL, dev, "Bug! prepare_tx with size %d (> %d)\n",
|
|
length, XMTU);
|
|
length = XMTU;
|
|
}
|
|
if (length > MinTU) {
|
|
hard->offset[0] = 0;
|
|
hard->offset[1] = ofs = 512 - length;
|
|
} else if (length > MTU) {
|
|
hard->offset[0] = 0;
|
|
hard->offset[1] = ofs = 512 - length - 3;
|
|
} else {
|
|
hard->offset[0] = ofs = 256 - length;
|
|
}
|
|
|
|
lp->hw.copy_to_card(dev, bufnum, 0, hard, ARC_HDR_SIZE);
|
|
lp->hw.copy_to_card(dev, bufnum, ofs, &pkt->soft, length);
|
|
|
|
lp->lastload_dest = hard->dest;
|
|
|
|
return 1; /* done */
|
|
}
|