^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * Linux ARCnet driver - "raw mode" packet encapsulation (no soft headers)
^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/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/gfp.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 <net/arp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <linux/skbuff.h>
^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) /* packet receiver */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static void rx(struct net_device *dev, int bufnum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct archdr *pkthdr, int length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) struct arcnet_local *lp = netdev_priv(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct archdr *pkt = pkthdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) int ofs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) arc_printk(D_DURING, dev, "it's a raw packet (length=%d)\n", length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (length > MTU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) ofs = 512 - length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) ofs = 256 - length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) skb = alloc_skb(length + ARC_HDR_SIZE, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) if (!skb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) dev->stats.rx_dropped++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) skb_put(skb, length + ARC_HDR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) skb->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) pkt = (struct archdr *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) skb_reset_mac_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) skb_pull(skb, ARC_HDR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) /* up to sizeof(pkt->soft) has already been copied from the card */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) memcpy(pkt, pkthdr, sizeof(struct archdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) if (length > sizeof(pkt->soft))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) lp->hw.copy_from_card(dev, bufnum, ofs + sizeof(pkt->soft),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) pkt->soft.raw + sizeof(pkt->soft),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) length - sizeof(pkt->soft));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (BUGLVL(D_SKB))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) arcnet_dump_skb(dev, skb, "rx");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) skb->protocol = cpu_to_be16(ETH_P_ARCNET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) netif_rx(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) /* Create the ARCnet hard/soft headers for raw mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * There aren't any soft headers in raw mode - not even the protocol id.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static int build_header(struct sk_buff *skb, struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) unsigned short type, uint8_t daddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) int hdr_size = ARC_HDR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) struct archdr *pkt = skb_push(skb, hdr_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) /* Set the source hardware address.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * This is pretty pointless for most purposes, but it can help in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * debugging. ARCnet does not allow us to change the source address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * in the actual packet sent.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) pkt->hard.source = *dev->dev_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) /* see linux/net/ethernet/eth.c to see where I got the following */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) /* FIXME: fill in the last byte of the dest ipaddr here
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * to better comply with RFC1051 in "noarp" mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) pkt->hard.dest = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return hdr_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) /* otherwise, just fill it in and go! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) pkt->hard.dest = daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return hdr_size; /* success */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) static int prepare_tx(struct net_device *dev, struct archdr *pkt, int length,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) int bufnum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) struct arcnet_local *lp = netdev_priv(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) struct arc_hardware *hard = &pkt->hard;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) int ofs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) arc_printk(D_DURING, dev, "prepare_tx: txbufs=%d/%d/%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) lp->next_tx, lp->cur_tx, bufnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) /* hard header is not included in packet length */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) length -= ARC_HDR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (length > XMTU) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) /* should never happen! other people already check for this. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) arc_printk(D_NORMAL, dev, "Bug! prepare_tx with size %d (> %d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) length, XMTU);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) length = XMTU;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (length >= MinTU) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) hard->offset[0] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) hard->offset[1] = ofs = 512 - length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) } else if (length > MTU) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) hard->offset[0] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) hard->offset[1] = ofs = 512 - length - 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) hard->offset[0] = ofs = 256 - length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^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, "prepare_tx: length=%d ofs=%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) length, ofs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) lp->hw.copy_to_card(dev, bufnum, 0, hard, ARC_HDR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) lp->hw.copy_to_card(dev, bufnum, ofs, &pkt->soft, length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) lp->lastload_dest = hard->dest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) return 1; /* done */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) static struct ArcProto rawmode_proto = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) .suffix = 'r',
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) .mtu = XMTU,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) .rx = rx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) .build_header = build_header,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) .prepare_tx = prepare_tx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) .continue_tx = NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) .ack_tx = NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) static int __init arcnet_raw_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) int count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) pr_info("raw mode (`r') encapsulation support loaded\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) for (count = 0; count < 256; count++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) if (arc_proto_map[count] == arc_proto_default)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) arc_proto_map[count] = &rawmode_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) /* for raw mode, we only set the bcast proto if there's no better one */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) if (arc_bcast_proto == arc_proto_default)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) arc_bcast_proto = &rawmode_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) arc_proto_default = &rawmode_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) static void __exit arcnet_raw_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) arcnet_unregister_proto(&rawmode_proto);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) module_init(arcnet_raw_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) module_exit(arcnet_raw_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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