^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * Linux ARCnet driver - RFC1201 (standard) packet encapsulation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Written 1994-1999 by Avery Pennarun.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Derived from skeleton.c by Donald Becker.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * for sponsoring the further development of this driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * **********************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * The original copyright of skeleton.c was as follows:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * skeleton.c Written 1993 by Donald Becker.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * Copyright 1993 United States Government as represented by the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * Director, National Security Agency. This software may only be used
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * and distributed according to the terms of the GNU General Public License as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * modified by SRC, incorporated herein by reference.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * **********************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * For more details, see drivers/net/arcnet.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * **********************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/gfp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/if_arp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include "arcdevice.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) static __be16 type_trans(struct sk_buff *skb, struct net_device *dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static void rx(struct net_device *dev, int bufnum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) struct archdr *pkthdr, int length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static int build_header(struct sk_buff *skb, struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) unsigned short type, uint8_t daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) static int prepare_tx(struct net_device *dev, struct archdr *pkt, int length,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) int bufnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static int continue_tx(struct net_device *dev, int bufnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) static struct ArcProto rfc1201_proto = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) .suffix = 'a',
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) .mtu = 1500, /* could be more, but some receivers can't handle it... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) .is_ip = 1, /* This is for sending IP and ARP packages */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) .rx = rx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) .build_header = build_header,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) .prepare_tx = prepare_tx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) .continue_tx = continue_tx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) .ack_tx = NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) static int __init arcnet_rfc1201_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) pr_info("%s\n", "RFC1201 \"standard\" (`a') encapsulation support loaded");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) arc_proto_map[ARC_P_IP]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) = arc_proto_map[ARC_P_IPV6]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) = arc_proto_map[ARC_P_ARP]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) = arc_proto_map[ARC_P_RARP]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) = arc_proto_map[ARC_P_IPX]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) = arc_proto_map[ARC_P_NOVELL_EC]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) = &rfc1201_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) /* if someone else already owns the broadcast, we won't take it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) if (arc_bcast_proto == arc_proto_default)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) arc_bcast_proto = &rfc1201_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) static void __exit arcnet_rfc1201_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) arcnet_unregister_proto(&rfc1201_proto);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) module_init(arcnet_rfc1201_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) module_exit(arcnet_rfc1201_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) /* Determine a packet's protocol ID.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * With ARCnet we have to convert everything to Ethernet-style stuff.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) static __be16 type_trans(struct sk_buff *skb, struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) struct archdr *pkt = (struct archdr *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) struct arc_rfc1201 *soft = &pkt->soft.rfc1201;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) int hdr_size = ARC_HDR_SIZE + RFC1201_HDR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) /* Pull off the arcnet header. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) skb_reset_mac_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) skb_pull(skb, hdr_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) if (pkt->hard.dest == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) skb->pkt_type = PACKET_BROADCAST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) } else if (dev->flags & IFF_PROMISC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) /* if we're not sending to ourselves :) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (pkt->hard.dest != dev->dev_addr[0])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) skb->pkt_type = PACKET_OTHERHOST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) /* now return the protocol number */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) switch (soft->proto) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) case ARC_P_IP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return htons(ETH_P_IP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) case ARC_P_IPV6:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) return htons(ETH_P_IPV6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) case ARC_P_ARP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) return htons(ETH_P_ARP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) case ARC_P_RARP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return htons(ETH_P_RARP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) case ARC_P_IPX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) case ARC_P_NOVELL_EC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return htons(ETH_P_802_3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) dev->stats.rx_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) dev->stats.rx_crc_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return htons(ETH_P_IP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) /* packet receiver */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static void rx(struct net_device *dev, int bufnum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) struct archdr *pkthdr, int length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) struct arcnet_local *lp = netdev_priv(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) struct archdr *pkt = pkthdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) struct arc_rfc1201 *soft = &pkthdr->soft.rfc1201;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) int saddr = pkt->hard.source, ofs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) struct Incoming *in = &lp->rfc1201.incoming[saddr];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) arc_printk(D_DURING, dev, "it's an RFC1201 packet (length=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) if (length >= MinTU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) ofs = 512 - length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) ofs = 256 - length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) if (soft->split_flag == 0xFF) { /* Exception Packet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) if (length >= 4 + RFC1201_HDR_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) arc_printk(D_DURING, dev, "compensating for exception packet\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) arc_printk(D_EXTRA, dev, "short RFC1201 exception packet from %02Xh",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) saddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) /* skip over 4-byte junkola */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) length -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) ofs += 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) lp->hw.copy_from_card(dev, bufnum, 512 - length,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) soft, sizeof(pkt->soft));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) if (!soft->split_flag) { /* not split */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) arc_printk(D_RX, dev, "incoming is not split (splitflag=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) soft->split_flag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) if (in->skb) { /* already assembling one! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) arc_printk(D_EXTRA, dev, "aborting assembly (seq=%d) for unsplit packet (splitflag=%d, seq=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) in->sequence, soft->split_flag,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) soft->sequence);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) lp->rfc1201.aborted_seq = soft->sequence;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) dev_kfree_skb_irq(in->skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) dev->stats.rx_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) dev->stats.rx_missed_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) in->skb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) in->sequence = soft->sequence;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) skb = alloc_skb(length + ARC_HDR_SIZE, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) if (!skb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) dev->stats.rx_dropped++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) skb_put(skb, length + ARC_HDR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) skb->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) pkt = (struct archdr *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) soft = &pkt->soft.rfc1201;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) /* up to sizeof(pkt->soft) has already
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) * been copied from the card
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) memcpy(pkt, pkthdr, sizeof(struct archdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) if (length > sizeof(pkt->soft))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) lp->hw.copy_from_card(dev, bufnum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) ofs + sizeof(pkt->soft),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) pkt->soft.raw + sizeof(pkt->soft),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) length - sizeof(pkt->soft));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) /* ARP packets have problems when sent from some DOS systems:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) * the source address is always 0!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) * So we take the hardware source addr (which is impossible
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) * to fumble) and insert it ourselves.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) if (soft->proto == ARC_P_ARP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) struct arphdr *arp = (struct arphdr *)soft->payload;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) /* make sure addresses are the right length */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) if (arp->ar_hln == 1 && arp->ar_pln == 4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) uint8_t *cptr = (uint8_t *)arp + sizeof(struct arphdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) if (!*cptr) { /* is saddr = 00? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) arc_printk(D_EXTRA, dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) "ARP source address was 00h, set to %02Xh\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) saddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) dev->stats.rx_crc_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) *cptr = saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) arc_printk(D_DURING, dev, "ARP source address (%Xh) is fine.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) *cptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) arc_printk(D_NORMAL, dev, "funny-shaped ARP packet. (%Xh, %Xh)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) arp->ar_hln, arp->ar_pln);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) dev->stats.rx_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) dev->stats.rx_crc_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) if (BUGLVL(D_SKB))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) arcnet_dump_skb(dev, skb, "rx");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) skb->protocol = type_trans(skb, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) netif_rx(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) } else { /* split packet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) /* NOTE: MSDOS ARP packet correction should only need to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) * apply to unsplit packets, since ARP packets are so short.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) * My interpretation of the RFC1201 document is that if a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) * packet is received out of order, the entire assembly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) * process should be aborted.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) * The RFC also mentions "it is possible for successfully
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) * received packets to be retransmitted." As of 0.40 all
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) * previously received packets are allowed, not just the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) * most recent one.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) * We allow multiple assembly processes, one for each
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) * ARCnet card possible on the network.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) * Seems rather like a waste of memory, but there's no
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) * other way to be reliable.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) arc_printk(D_RX, dev, "packet is split (splitflag=%d, seq=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) soft->split_flag, in->sequence);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) if (in->skb && in->sequence != soft->sequence) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) arc_printk(D_EXTRA, dev, "wrong seq number (saddr=%d, expected=%d, seq=%d, splitflag=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) saddr, in->sequence, soft->sequence,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) soft->split_flag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) dev_kfree_skb_irq(in->skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) in->skb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) dev->stats.rx_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) dev->stats.rx_missed_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) in->lastpacket = in->numpackets = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) if (soft->split_flag & 1) { /* first packet in split */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) arc_printk(D_RX, dev, "brand new splitpacket (splitflag=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) soft->split_flag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) if (in->skb) { /* already assembling one! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) arc_printk(D_EXTRA, dev, "aborting previous (seq=%d) assembly (splitflag=%d, seq=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) in->sequence, soft->split_flag,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) soft->sequence);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) dev->stats.rx_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) dev->stats.rx_missed_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) dev_kfree_skb_irq(in->skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) in->sequence = soft->sequence;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) in->numpackets = ((unsigned)soft->split_flag >> 1) + 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) in->lastpacket = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) if (in->numpackets > 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) arc_printk(D_EXTRA, dev, "incoming packet more than 16 segments; dropping. (splitflag=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) soft->split_flag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) lp->rfc1201.aborted_seq = soft->sequence;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) dev->stats.rx_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) dev->stats.rx_length_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) in->skb = skb = alloc_skb(508 * in->numpackets + ARC_HDR_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) if (!skb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) arc_printk(D_NORMAL, dev, "(split) memory squeeze, dropping packet.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) lp->rfc1201.aborted_seq = soft->sequence;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) dev->stats.rx_dropped++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) skb->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) pkt = (struct archdr *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) soft = &pkt->soft.rfc1201;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) memcpy(pkt, pkthdr, ARC_HDR_SIZE + RFC1201_HDR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) skb_put(skb, ARC_HDR_SIZE + RFC1201_HDR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) soft->split_flag = 0; /* end result won't be split */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) } else { /* not first packet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) int packetnum = ((unsigned)soft->split_flag >> 1) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) /* if we're not assembling, there's no point trying to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) * continue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) if (!in->skb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) if (lp->rfc1201.aborted_seq != soft->sequence) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) arc_printk(D_EXTRA, dev, "can't continue split without starting first! (splitflag=%d, seq=%d, aborted=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) soft->split_flag,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) soft->sequence,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) lp->rfc1201.aborted_seq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) dev->stats.rx_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) dev->stats.rx_missed_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) in->lastpacket++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) /* if not the right flag */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) if (packetnum != in->lastpacket) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) /* harmless duplicate? ignore. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) if (packetnum <= in->lastpacket - 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) arc_printk(D_EXTRA, dev, "duplicate splitpacket ignored! (splitflag=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) soft->split_flag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) dev->stats.rx_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) dev->stats.rx_frame_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) /* "bad" duplicate, kill reassembly */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) arc_printk(D_EXTRA, dev, "out-of-order splitpacket, reassembly (seq=%d) aborted (splitflag=%d, seq=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) in->sequence, soft->split_flag,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) soft->sequence);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) lp->rfc1201.aborted_seq = soft->sequence;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) dev_kfree_skb_irq(in->skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) in->skb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) dev->stats.rx_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) dev->stats.rx_missed_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) in->lastpacket = in->numpackets = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) pkt = (struct archdr *)in->skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) soft = &pkt->soft.rfc1201;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) skb = in->skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) lp->hw.copy_from_card(dev, bufnum, ofs + RFC1201_HDR_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) skb->data + skb->len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) length - RFC1201_HDR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) skb_put(skb, length - RFC1201_HDR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) /* are we done? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) if (in->lastpacket == in->numpackets) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) in->skb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) in->lastpacket = in->numpackets = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) arc_printk(D_SKB_SIZE, dev, "skb: received %d bytes from %02X (unsplit)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) skb->len, pkt->hard.source);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) arc_printk(D_SKB_SIZE, dev, "skb: received %d bytes from %02X (split)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) skb->len, pkt->hard.source);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) if (BUGLVL(D_SKB))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) arcnet_dump_skb(dev, skb, "rx");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) skb->protocol = type_trans(skb, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) netif_rx(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) /* Create the ARCnet hard/soft headers for RFC1201. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) static int build_header(struct sk_buff *skb, struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) unsigned short type, uint8_t daddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) struct arcnet_local *lp = netdev_priv(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) int hdr_size = ARC_HDR_SIZE + RFC1201_HDR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) struct archdr *pkt = skb_push(skb, hdr_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) struct arc_rfc1201 *soft = &pkt->soft.rfc1201;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) /* set the protocol ID according to RFC1201 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) switch (type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) case ETH_P_IP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) soft->proto = ARC_P_IP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) case ETH_P_IPV6:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) soft->proto = ARC_P_IPV6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) case ETH_P_ARP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) soft->proto = ARC_P_ARP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) case ETH_P_RARP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) soft->proto = ARC_P_RARP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) case ETH_P_IPX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) case ETH_P_802_3:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) case ETH_P_802_2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) soft->proto = ARC_P_IPX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) case ETH_P_ATALK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) soft->proto = ARC_P_ATALK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) arc_printk(D_NORMAL, dev, "RFC1201: I don't understand protocol %d (%Xh)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) type, type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) dev->stats.tx_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) dev->stats.tx_aborted_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) /* Set the source hardware address.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) * This is pretty pointless for most purposes, but it can help in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) * debugging. ARCnet does not allow us to change the source address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) * in the actual packet sent.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) pkt->hard.source = *dev->dev_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) soft->sequence = htons(lp->rfc1201.sequence++);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) soft->split_flag = 0; /* split packets are done elsewhere */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) /* see linux/net/ethernet/eth.c to see where I got the following */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) /* FIXME: fill in the last byte of the dest ipaddr here
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) * to better comply with RFC1051 in "noarp" mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) * For now, always broadcasting will probably at least get
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) * packets sent out :)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) pkt->hard.dest = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) return hdr_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) /* otherwise, drop in the dest address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) pkt->hard.dest = daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) return hdr_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) static void load_pkt(struct net_device *dev, struct arc_hardware *hard,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) struct arc_rfc1201 *soft, int softlen, int bufnum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) struct arcnet_local *lp = netdev_priv(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) int ofs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) /* assume length <= XMTU: someone should have handled that by now. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) if (softlen > MinTU) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) hard->offset[0] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) hard->offset[1] = ofs = 512 - softlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) } else if (softlen > MTU) { /* exception packet - add an extra header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) struct arc_rfc1201 excsoft;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) excsoft.proto = soft->proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) excsoft.split_flag = 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) excsoft.sequence = htons(0xffff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) hard->offset[0] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) ofs = 512 - softlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) hard->offset[1] = ofs - RFC1201_HDR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) lp->hw.copy_to_card(dev, bufnum, ofs - RFC1201_HDR_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) &excsoft, RFC1201_HDR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) hard->offset[0] = ofs = 256 - softlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) lp->hw.copy_to_card(dev, bufnum, 0, hard, ARC_HDR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) lp->hw.copy_to_card(dev, bufnum, ofs, soft, softlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) lp->lastload_dest = hard->dest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) static int prepare_tx(struct net_device *dev, struct archdr *pkt, int length,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) int bufnum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) struct arcnet_local *lp = netdev_priv(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) const int maxsegsize = XMTU - RFC1201_HDR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) struct Outgoing *out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) arc_printk(D_DURING, dev, "prepare_tx: txbufs=%d/%d/%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) lp->next_tx, lp->cur_tx, bufnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) /* hard header is not included in packet length */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) length -= ARC_HDR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) pkt->soft.rfc1201.split_flag = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) /* need to do a split packet? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) if (length > XMTU) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) out = &lp->outgoing;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) out->length = length - RFC1201_HDR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) out->dataleft = lp->outgoing.length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) out->numsegs = (out->dataleft + maxsegsize - 1) / maxsegsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) out->segnum = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) arc_printk(D_DURING, dev, "rfc1201 prep_tx: ready for %d-segment split (%d bytes, seq=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) out->numsegs, out->length,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) pkt->soft.rfc1201.sequence);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) return 0; /* not done */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) /* just load the packet into the buffers and send it off */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) load_pkt(dev, &pkt->hard, &pkt->soft.rfc1201, length, bufnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) return 1; /* done */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) static int continue_tx(struct net_device *dev, int bufnum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) struct arcnet_local *lp = netdev_priv(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) struct Outgoing *out = &lp->outgoing;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) struct arc_hardware *hard = &out->pkt->hard;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) struct arc_rfc1201 *soft = &out->pkt->soft.rfc1201, *newsoft;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) int maxsegsize = XMTU - RFC1201_HDR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) int seglen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) arc_printk(D_DURING, dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) "rfc1201 continue_tx: loading segment %d(+1) of %d (seq=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) out->segnum, out->numsegs, soft->sequence);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) /* the "new" soft header comes right before the data chunk */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) newsoft = (struct arc_rfc1201 *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) (out->pkt->soft.raw + out->length - out->dataleft);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) if (!out->segnum) /* first packet; newsoft == soft */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) newsoft->split_flag = ((out->numsegs - 2) << 1) | 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) newsoft->split_flag = out->segnum << 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) newsoft->proto = soft->proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) newsoft->sequence = soft->sequence;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) seglen = maxsegsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) if (seglen > out->dataleft)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) seglen = out->dataleft;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) out->dataleft -= seglen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) load_pkt(dev, hard, newsoft, seglen + RFC1201_HDR_SIZE, bufnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) out->segnum++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) if (out->segnum >= out->numsegs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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