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547 lines
16 KiB
547 lines
16 KiB
/* |
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* Linux ARCnet driver - RFC1201 (standard) packet encapsulation |
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* |
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* Written 1994-1999 by Avery Pennarun. |
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* Derived from skeleton.c by Donald Becker. |
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* |
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* Special thanks to Contemporary Controls, Inc. (www.ccontrols.com) |
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* for sponsoring the further development of this driver. |
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* |
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* ********************** |
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* |
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* The original copyright of skeleton.c was as follows: |
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* |
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* skeleton.c Written 1993 by Donald Becker. |
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* Copyright 1993 United States Government as represented by the |
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* Director, National Security Agency. This software may only be used |
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* and distributed according to the terms of the GNU General Public License as |
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* modified by SRC, incorporated herein by reference. |
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* |
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* ********************** |
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* |
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* For more details, see drivers/net/arcnet.c |
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* |
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* ********************** |
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*/ |
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#define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt |
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#include <linux/gfp.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/if_arp.h> |
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#include <linux/netdevice.h> |
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#include <linux/skbuff.h> |
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#include "arcdevice.h" |
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MODULE_LICENSE("GPL"); |
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static __be16 type_trans(struct sk_buff *skb, struct net_device *dev); |
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static void rx(struct net_device *dev, int bufnum, |
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struct archdr *pkthdr, int length); |
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static int build_header(struct sk_buff *skb, struct net_device *dev, |
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unsigned short type, uint8_t daddr); |
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static int prepare_tx(struct net_device *dev, struct archdr *pkt, int length, |
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int bufnum); |
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static int continue_tx(struct net_device *dev, int bufnum); |
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static struct ArcProto rfc1201_proto = { |
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.suffix = 'a', |
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.mtu = 1500, /* could be more, but some receivers can't handle it... */ |
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.is_ip = 1, /* This is for sending IP and ARP packages */ |
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.rx = rx, |
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.build_header = build_header, |
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.prepare_tx = prepare_tx, |
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.continue_tx = continue_tx, |
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.ack_tx = NULL |
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}; |
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static int __init arcnet_rfc1201_init(void) |
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{ |
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pr_info("%s\n", "RFC1201 \"standard\" (`a') encapsulation support loaded"); |
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arc_proto_map[ARC_P_IP] |
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= arc_proto_map[ARC_P_IPV6] |
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= arc_proto_map[ARC_P_ARP] |
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= arc_proto_map[ARC_P_RARP] |
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= arc_proto_map[ARC_P_IPX] |
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= arc_proto_map[ARC_P_NOVELL_EC] |
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= &rfc1201_proto; |
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/* if someone else already owns the broadcast, we won't take it */ |
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if (arc_bcast_proto == arc_proto_default) |
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arc_bcast_proto = &rfc1201_proto; |
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return 0; |
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} |
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static void __exit arcnet_rfc1201_exit(void) |
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{ |
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arcnet_unregister_proto(&rfc1201_proto); |
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} |
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module_init(arcnet_rfc1201_init); |
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module_exit(arcnet_rfc1201_exit); |
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/* Determine a packet's protocol ID. |
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* |
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* With ARCnet we have to convert everything to Ethernet-style stuff. |
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*/ |
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static __be16 type_trans(struct sk_buff *skb, struct net_device *dev) |
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{ |
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struct archdr *pkt = (struct archdr *)skb->data; |
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struct arc_rfc1201 *soft = &pkt->soft.rfc1201; |
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int hdr_size = ARC_HDR_SIZE + RFC1201_HDR_SIZE; |
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/* Pull off the arcnet header. */ |
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skb_reset_mac_header(skb); |
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skb_pull(skb, hdr_size); |
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if (pkt->hard.dest == 0) { |
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skb->pkt_type = PACKET_BROADCAST; |
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} else if (dev->flags & IFF_PROMISC) { |
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/* if we're not sending to ourselves :) */ |
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if (pkt->hard.dest != dev->dev_addr[0]) |
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skb->pkt_type = PACKET_OTHERHOST; |
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} |
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/* now return the protocol number */ |
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switch (soft->proto) { |
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case ARC_P_IP: |
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return htons(ETH_P_IP); |
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case ARC_P_IPV6: |
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return htons(ETH_P_IPV6); |
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case ARC_P_ARP: |
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return htons(ETH_P_ARP); |
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case ARC_P_RARP: |
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return htons(ETH_P_RARP); |
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case ARC_P_IPX: |
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case ARC_P_NOVELL_EC: |
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return htons(ETH_P_802_3); |
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default: |
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dev->stats.rx_errors++; |
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dev->stats.rx_crc_errors++; |
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return 0; |
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} |
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return htons(ETH_P_IP); |
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} |
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/* packet receiver */ |
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static void rx(struct net_device *dev, int bufnum, |
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struct archdr *pkthdr, int length) |
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{ |
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struct arcnet_local *lp = netdev_priv(dev); |
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struct sk_buff *skb; |
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struct archdr *pkt = pkthdr; |
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struct arc_rfc1201 *soft = &pkthdr->soft.rfc1201; |
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int saddr = pkt->hard.source, ofs; |
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struct Incoming *in = &lp->rfc1201.incoming[saddr]; |
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arc_printk(D_DURING, dev, "it's an RFC1201 packet (length=%d)\n", |
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length); |
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if (length >= MinTU) |
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ofs = 512 - length; |
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else |
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ofs = 256 - length; |
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if (soft->split_flag == 0xFF) { /* Exception Packet */ |
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if (length >= 4 + RFC1201_HDR_SIZE) { |
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arc_printk(D_DURING, dev, "compensating for exception packet\n"); |
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} else { |
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arc_printk(D_EXTRA, dev, "short RFC1201 exception packet from %02Xh", |
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saddr); |
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return; |
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} |
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/* skip over 4-byte junkola */ |
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length -= 4; |
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ofs += 4; |
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lp->hw.copy_from_card(dev, bufnum, 512 - length, |
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soft, sizeof(pkt->soft)); |
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} |
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if (!soft->split_flag) { /* not split */ |
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arc_printk(D_RX, dev, "incoming is not split (splitflag=%d)\n", |
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soft->split_flag); |
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if (in->skb) { /* already assembling one! */ |
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arc_printk(D_EXTRA, dev, "aborting assembly (seq=%d) for unsplit packet (splitflag=%d, seq=%d)\n", |
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in->sequence, soft->split_flag, |
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soft->sequence); |
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lp->rfc1201.aborted_seq = soft->sequence; |
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dev_kfree_skb_irq(in->skb); |
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dev->stats.rx_errors++; |
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dev->stats.rx_missed_errors++; |
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in->skb = NULL; |
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} |
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in->sequence = soft->sequence; |
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skb = alloc_skb(length + ARC_HDR_SIZE, GFP_ATOMIC); |
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if (!skb) { |
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dev->stats.rx_dropped++; |
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return; |
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} |
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skb_put(skb, length + ARC_HDR_SIZE); |
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skb->dev = dev; |
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pkt = (struct archdr *)skb->data; |
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soft = &pkt->soft.rfc1201; |
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/* up to sizeof(pkt->soft) has already |
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* been copied from the card |
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*/ |
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memcpy(pkt, pkthdr, sizeof(struct archdr)); |
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if (length > sizeof(pkt->soft)) |
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lp->hw.copy_from_card(dev, bufnum, |
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ofs + sizeof(pkt->soft), |
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pkt->soft.raw + sizeof(pkt->soft), |
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length - sizeof(pkt->soft)); |
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/* ARP packets have problems when sent from some DOS systems: |
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* the source address is always 0! |
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* So we take the hardware source addr (which is impossible |
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* to fumble) and insert it ourselves. |
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*/ |
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if (soft->proto == ARC_P_ARP) { |
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struct arphdr *arp = (struct arphdr *)soft->payload; |
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/* make sure addresses are the right length */ |
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if (arp->ar_hln == 1 && arp->ar_pln == 4) { |
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uint8_t *cptr = (uint8_t *)arp + sizeof(struct arphdr); |
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if (!*cptr) { /* is saddr = 00? */ |
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arc_printk(D_EXTRA, dev, |
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"ARP source address was 00h, set to %02Xh\n", |
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saddr); |
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dev->stats.rx_crc_errors++; |
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*cptr = saddr; |
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} else { |
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arc_printk(D_DURING, dev, "ARP source address (%Xh) is fine.\n", |
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*cptr); |
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} |
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} else { |
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arc_printk(D_NORMAL, dev, "funny-shaped ARP packet. (%Xh, %Xh)\n", |
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arp->ar_hln, arp->ar_pln); |
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dev->stats.rx_errors++; |
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dev->stats.rx_crc_errors++; |
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} |
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} |
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if (BUGLVL(D_SKB)) |
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arcnet_dump_skb(dev, skb, "rx"); |
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skb->protocol = type_trans(skb, dev); |
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netif_rx(skb); |
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} else { /* split packet */ |
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/* NOTE: MSDOS ARP packet correction should only need to |
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* apply to unsplit packets, since ARP packets are so short. |
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* |
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* My interpretation of the RFC1201 document is that if a |
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* packet is received out of order, the entire assembly |
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* process should be aborted. |
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* |
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* The RFC also mentions "it is possible for successfully |
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* received packets to be retransmitted." As of 0.40 all |
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* previously received packets are allowed, not just the |
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* most recent one. |
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* |
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* We allow multiple assembly processes, one for each |
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* ARCnet card possible on the network. |
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* Seems rather like a waste of memory, but there's no |
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* other way to be reliable. |
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*/ |
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arc_printk(D_RX, dev, "packet is split (splitflag=%d, seq=%d)\n", |
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soft->split_flag, in->sequence); |
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if (in->skb && in->sequence != soft->sequence) { |
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arc_printk(D_EXTRA, dev, "wrong seq number (saddr=%d, expected=%d, seq=%d, splitflag=%d)\n", |
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saddr, in->sequence, soft->sequence, |
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soft->split_flag); |
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dev_kfree_skb_irq(in->skb); |
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in->skb = NULL; |
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dev->stats.rx_errors++; |
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dev->stats.rx_missed_errors++; |
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in->lastpacket = in->numpackets = 0; |
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} |
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if (soft->split_flag & 1) { /* first packet in split */ |
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arc_printk(D_RX, dev, "brand new splitpacket (splitflag=%d)\n", |
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soft->split_flag); |
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if (in->skb) { /* already assembling one! */ |
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arc_printk(D_EXTRA, dev, "aborting previous (seq=%d) assembly (splitflag=%d, seq=%d)\n", |
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in->sequence, soft->split_flag, |
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soft->sequence); |
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dev->stats.rx_errors++; |
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dev->stats.rx_missed_errors++; |
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dev_kfree_skb_irq(in->skb); |
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} |
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in->sequence = soft->sequence; |
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in->numpackets = ((unsigned)soft->split_flag >> 1) + 2; |
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in->lastpacket = 1; |
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if (in->numpackets > 16) { |
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arc_printk(D_EXTRA, dev, "incoming packet more than 16 segments; dropping. (splitflag=%d)\n", |
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soft->split_flag); |
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lp->rfc1201.aborted_seq = soft->sequence; |
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dev->stats.rx_errors++; |
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dev->stats.rx_length_errors++; |
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return; |
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} |
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in->skb = skb = alloc_skb(508 * in->numpackets + ARC_HDR_SIZE, |
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GFP_ATOMIC); |
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if (!skb) { |
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arc_printk(D_NORMAL, dev, "(split) memory squeeze, dropping packet.\n"); |
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lp->rfc1201.aborted_seq = soft->sequence; |
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dev->stats.rx_dropped++; |
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return; |
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} |
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skb->dev = dev; |
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pkt = (struct archdr *)skb->data; |
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soft = &pkt->soft.rfc1201; |
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memcpy(pkt, pkthdr, ARC_HDR_SIZE + RFC1201_HDR_SIZE); |
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skb_put(skb, ARC_HDR_SIZE + RFC1201_HDR_SIZE); |
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soft->split_flag = 0; /* end result won't be split */ |
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} else { /* not first packet */ |
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int packetnum = ((unsigned)soft->split_flag >> 1) + 1; |
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/* if we're not assembling, there's no point trying to |
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* continue. |
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*/ |
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if (!in->skb) { |
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if (lp->rfc1201.aborted_seq != soft->sequence) { |
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arc_printk(D_EXTRA, dev, "can't continue split without starting first! (splitflag=%d, seq=%d, aborted=%d)\n", |
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soft->split_flag, |
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soft->sequence, |
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lp->rfc1201.aborted_seq); |
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dev->stats.rx_errors++; |
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dev->stats.rx_missed_errors++; |
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} |
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return; |
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} |
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in->lastpacket++; |
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/* if not the right flag */ |
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if (packetnum != in->lastpacket) { |
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/* harmless duplicate? ignore. */ |
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if (packetnum <= in->lastpacket - 1) { |
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arc_printk(D_EXTRA, dev, "duplicate splitpacket ignored! (splitflag=%d)\n", |
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soft->split_flag); |
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dev->stats.rx_errors++; |
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dev->stats.rx_frame_errors++; |
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return; |
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} |
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/* "bad" duplicate, kill reassembly */ |
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arc_printk(D_EXTRA, dev, "out-of-order splitpacket, reassembly (seq=%d) aborted (splitflag=%d, seq=%d)\n", |
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in->sequence, soft->split_flag, |
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soft->sequence); |
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lp->rfc1201.aborted_seq = soft->sequence; |
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dev_kfree_skb_irq(in->skb); |
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in->skb = NULL; |
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dev->stats.rx_errors++; |
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dev->stats.rx_missed_errors++; |
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in->lastpacket = in->numpackets = 0; |
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return; |
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} |
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pkt = (struct archdr *)in->skb->data; |
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soft = &pkt->soft.rfc1201; |
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} |
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skb = in->skb; |
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lp->hw.copy_from_card(dev, bufnum, ofs + RFC1201_HDR_SIZE, |
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skb->data + skb->len, |
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length - RFC1201_HDR_SIZE); |
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skb_put(skb, length - RFC1201_HDR_SIZE); |
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/* are we done? */ |
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if (in->lastpacket == in->numpackets) { |
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in->skb = NULL; |
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in->lastpacket = in->numpackets = 0; |
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arc_printk(D_SKB_SIZE, dev, "skb: received %d bytes from %02X (unsplit)\n", |
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skb->len, pkt->hard.source); |
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arc_printk(D_SKB_SIZE, dev, "skb: received %d bytes from %02X (split)\n", |
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skb->len, pkt->hard.source); |
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if (BUGLVL(D_SKB)) |
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arcnet_dump_skb(dev, skb, "rx"); |
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skb->protocol = type_trans(skb, dev); |
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netif_rx(skb); |
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} |
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} |
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} |
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/* Create the ARCnet hard/soft headers for RFC1201. */ |
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static int build_header(struct sk_buff *skb, struct net_device *dev, |
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unsigned short type, uint8_t daddr) |
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{ |
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struct arcnet_local *lp = netdev_priv(dev); |
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int hdr_size = ARC_HDR_SIZE + RFC1201_HDR_SIZE; |
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struct archdr *pkt = skb_push(skb, hdr_size); |
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struct arc_rfc1201 *soft = &pkt->soft.rfc1201; |
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/* set the protocol ID according to RFC1201 */ |
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switch (type) { |
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case ETH_P_IP: |
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soft->proto = ARC_P_IP; |
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break; |
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case ETH_P_IPV6: |
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soft->proto = ARC_P_IPV6; |
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break; |
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case ETH_P_ARP: |
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soft->proto = ARC_P_ARP; |
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break; |
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case ETH_P_RARP: |
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soft->proto = ARC_P_RARP; |
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break; |
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case ETH_P_IPX: |
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case ETH_P_802_3: |
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case ETH_P_802_2: |
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soft->proto = ARC_P_IPX; |
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break; |
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case ETH_P_ATALK: |
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soft->proto = ARC_P_ATALK; |
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break; |
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default: |
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arc_printk(D_NORMAL, dev, "RFC1201: I don't understand protocol %d (%Xh)\n", |
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type, type); |
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dev->stats.tx_errors++; |
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dev->stats.tx_aborted_errors++; |
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return 0; |
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} |
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|
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/* Set the source hardware address. |
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* |
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* This is pretty pointless for most purposes, but it can help in |
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* debugging. ARCnet does not allow us to change the source address |
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* in the actual packet sent. |
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*/ |
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pkt->hard.source = *dev->dev_addr; |
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soft->sequence = htons(lp->rfc1201.sequence++); |
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soft->split_flag = 0; /* split packets are done elsewhere */ |
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/* see linux/net/ethernet/eth.c to see where I got the following */ |
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if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) { |
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/* FIXME: fill in the last byte of the dest ipaddr here |
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* to better comply with RFC1051 in "noarp" mode. |
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* For now, always broadcasting will probably at least get |
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* packets sent out :) |
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*/ |
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pkt->hard.dest = 0; |
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return hdr_size; |
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} |
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/* otherwise, drop in the dest address */ |
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pkt->hard.dest = daddr; |
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return hdr_size; |
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} |
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static void load_pkt(struct net_device *dev, struct arc_hardware *hard, |
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struct arc_rfc1201 *soft, int softlen, int bufnum) |
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{ |
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struct arcnet_local *lp = netdev_priv(dev); |
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int ofs; |
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/* assume length <= XMTU: someone should have handled that by now. */ |
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if (softlen > MinTU) { |
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hard->offset[0] = 0; |
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hard->offset[1] = ofs = 512 - softlen; |
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} else if (softlen > MTU) { /* exception packet - add an extra header */ |
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struct arc_rfc1201 excsoft; |
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excsoft.proto = soft->proto; |
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excsoft.split_flag = 0xff; |
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excsoft.sequence = htons(0xffff); |
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hard->offset[0] = 0; |
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ofs = 512 - softlen; |
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hard->offset[1] = ofs - RFC1201_HDR_SIZE; |
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lp->hw.copy_to_card(dev, bufnum, ofs - RFC1201_HDR_SIZE, |
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&excsoft, RFC1201_HDR_SIZE); |
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} else { |
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hard->offset[0] = ofs = 256 - softlen; |
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} |
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lp->hw.copy_to_card(dev, bufnum, 0, hard, ARC_HDR_SIZE); |
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lp->hw.copy_to_card(dev, bufnum, ofs, soft, softlen); |
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lp->lastload_dest = hard->dest; |
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} |
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static int prepare_tx(struct net_device *dev, struct archdr *pkt, int length, |
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int bufnum) |
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{ |
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struct arcnet_local *lp = netdev_priv(dev); |
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const int maxsegsize = XMTU - RFC1201_HDR_SIZE; |
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struct Outgoing *out; |
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arc_printk(D_DURING, dev, "prepare_tx: txbufs=%d/%d/%d\n", |
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lp->next_tx, lp->cur_tx, bufnum); |
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|
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/* hard header is not included in packet length */ |
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length -= ARC_HDR_SIZE; |
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pkt->soft.rfc1201.split_flag = 0; |
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|
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/* need to do a split packet? */ |
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if (length > XMTU) { |
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out = &lp->outgoing; |
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|
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out->length = length - RFC1201_HDR_SIZE; |
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out->dataleft = lp->outgoing.length; |
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out->numsegs = (out->dataleft + maxsegsize - 1) / maxsegsize; |
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out->segnum = 0; |
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arc_printk(D_DURING, dev, "rfc1201 prep_tx: ready for %d-segment split (%d bytes, seq=%d)\n", |
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out->numsegs, out->length, |
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pkt->soft.rfc1201.sequence); |
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|
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return 0; /* not done */ |
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} |
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/* just load the packet into the buffers and send it off */ |
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load_pkt(dev, &pkt->hard, &pkt->soft.rfc1201, length, bufnum); |
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|
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return 1; /* done */ |
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} |
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static int continue_tx(struct net_device *dev, int bufnum) |
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{ |
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struct arcnet_local *lp = netdev_priv(dev); |
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struct Outgoing *out = &lp->outgoing; |
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struct arc_hardware *hard = &out->pkt->hard; |
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struct arc_rfc1201 *soft = &out->pkt->soft.rfc1201, *newsoft; |
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int maxsegsize = XMTU - RFC1201_HDR_SIZE; |
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int seglen; |
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|
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arc_printk(D_DURING, dev, |
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"rfc1201 continue_tx: loading segment %d(+1) of %d (seq=%d)\n", |
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out->segnum, out->numsegs, soft->sequence); |
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|
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/* the "new" soft header comes right before the data chunk */ |
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newsoft = (struct arc_rfc1201 *) |
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(out->pkt->soft.raw + out->length - out->dataleft); |
|
|
|
if (!out->segnum) /* first packet; newsoft == soft */ |
|
newsoft->split_flag = ((out->numsegs - 2) << 1) | 1; |
|
else { |
|
newsoft->split_flag = out->segnum << 1; |
|
newsoft->proto = soft->proto; |
|
newsoft->sequence = soft->sequence; |
|
} |
|
|
|
seglen = maxsegsize; |
|
if (seglen > out->dataleft) |
|
seglen = out->dataleft; |
|
out->dataleft -= seglen; |
|
|
|
load_pkt(dev, hard, newsoft, seglen + RFC1201_HDR_SIZE, bufnum); |
|
|
|
out->segnum++; |
|
if (out->segnum >= out->numsegs) |
|
return 1; |
|
else |
|
return 0; |
|
}
|
|
|