LXR linux/drivers/block/aoe/aoenet.c

   1/* Copyright (c) 2007 Coraid, Inc.  See COPYING for GPL terms. */
   2/*
   3 * aoenet.c
   4 * Ethernet portion of AoE driver
   5 */
   6
   7#include <linux/hdreg.h>
   8#include <linux/blkdev.h>
   9#include <linux/netdevice.h>
  10#include <linux/moduleparam.h>
  11#include <net/net_namespace.h>
  12#include <asm/unaligned.h>
  13#include "aoe.h"
  14
  15#define NECODES 5
  16
  17static char *aoe_errlist[] =
  18{
  19        "no such error",
  20        "unrecognized command code",
  21        "bad argument parameter",
  22        "device unavailable",
  23        "config string present",
  24        "unsupported version"
  25};
  26
  27enum {
  28        IFLISTSZ = 1024,
  29};
  30
  31static char aoe_iflist[IFLISTSZ];
  32module_param_string(aoe_iflist, aoe_iflist, IFLISTSZ, 0600);
  33MODULE_PARM_DESC(aoe_iflist, "aoe_iflist=\"dev1 [dev2 ...]\"");
  34
  35#ifndef MODULE
  36static int __init aoe_iflist_setup(char *str)
  37{
  38        strncpy(aoe_iflist, str, IFLISTSZ);
  39        aoe_iflist[IFLISTSZ - 1] = '\0';
  40        return 1;
  41}
  42
  43__setup("aoe_iflist=", aoe_iflist_setup);
  44#endif
  45
  46int
  47is_aoe_netif(struct net_device *ifp)
  48{
  49        register char *p, *q;
  50        register int len;
  51
  52        if (aoe_iflist[0] == '\0')
  53                return 1;
  54
  55        p = aoe_iflist + strspn(aoe_iflist, WHITESPACE);
  56        for (; *p; p = q + strspn(q, WHITESPACE)) {
  57                q = p + strcspn(p, WHITESPACE);
  58                if (q != p)
  59                        len = q - p;
  60                else
  61                        len = strlen(p); /* last token in aoe_iflist */
  62
  63                if (strlen(ifp->name) == len && !strncmp(ifp->name, p, len))
  64                        return 1;
  65                if (q == p)
  66                        break;
  67        }
  68
  69        return 0;
  70}
  71
  72int
  73set_aoe_iflist(const char __user *user_str, size_t size)
  74{
  75        if (size >= IFLISTSZ)
  76                return -EINVAL;
  77
  78        if (copy_from_user(aoe_iflist, user_str, size)) {
  79                printk(KERN_INFO "aoe: copy from user failed\n");
  80                return -EFAULT;
  81        }
  82        aoe_iflist[size] = 0x00;
  83        return 0;
  84}
  85
  86void
  87aoenet_xmit(struct sk_buff_head *queue)
  88{
  89        struct sk_buff *skb, *tmp;
  90
  91        skb_queue_walk_safe(queue, skb, tmp) {
  92                __skb_unlink(skb, queue);
  93                dev_queue_xmit(skb);
  94        }
  95}
  96
  97/* 
  98 * (1) len doesn't include the header by default.  I want this. 
  99 */
 100static int
 101aoenet_rcv(struct sk_buff *skb, struct net_device *ifp, struct packet_type *pt, struct net_device *orig_dev)
 102{
 103        struct aoe_hdr *h;
 104        u32 n;
 105
 106        if (dev_net(ifp) != &init_net)
 107                goto exit;
 108
 109        skb = skb_share_check(skb, GFP_ATOMIC);
 110        if (skb == NULL)
 111                return 0;
 112        if (skb_linearize(skb))
 113                goto exit;
 114        if (!is_aoe_netif(ifp))
 115                goto exit;
 116        skb_push(skb, ETH_HLEN);        /* (1) */
 117
 118        h = (struct aoe_hdr *) skb_mac_header(skb);
 119        n = get_unaligned_be32(&h->tag);
 120        if ((h->verfl & AOEFL_RSP) == 0 || (n & 1<<31))
 121                goto exit;
 122
 123        if (h->verfl & AOEFL_ERR) {
 124                n = h->err;
 125                if (n > NECODES)
 126                        n = 0;
 127                if (net_ratelimit())
 128                        printk(KERN_ERR
 129                                "%s%d.%d@%s; ecode=%d '%s'\n",
 130                                "aoe: error packet from ",
 131                                get_unaligned_be16(&h->major),
 132                                h->minor, skb->dev->name,
 133                                h->err, aoe_errlist[n]);
 134                goto exit;
 135        }
 136
 137        switch (h->cmd) {
 138        case AOECMD_ATA:
 139                aoecmd_ata_rsp(skb);
 140                break;
 141        case AOECMD_CFG:
 142                aoecmd_cfg_rsp(skb);
 143                break;
 144        default:
 145                if (h->cmd >= AOECMD_VEND_MIN)
 146                        break;  /* don't complain about vendor commands */
 147                printk(KERN_INFO "aoe: unknown cmd %d\n", h->cmd);
 148        }
 149exit:
 150        dev_kfree_skb(skb);
 151        return 0;
 152}
 153
 154static struct packet_type aoe_pt __read_mostly = {
 155        .type = __constant_htons(ETH_P_AOE),
 156        .func = aoenet_rcv,
 157};
 158
 159int __init
 160aoenet_init(void)
 161{
 162        dev_add_pack(&aoe_pt);
 163        return 0;
 164}
 165
 166void
 167aoenet_exit(void)
 168{
 169        dev_remove_pack(&aoe_pt);
 170}
 171
 172