drivers/block/aoe/aoenet.c

   1 /* Copyright (c) 2004 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 "aoe.h"
  12
  13 #define NECODES 5
  14
  15 static char *aoe_errlist[] =
  16 {
  17         "no such error",
  18         "unrecognized command code",
  19         "bad argument parameter",
  20         "device unavailable",
  21         "config string present",
  22         "unsupported version"
  23 };
  24
  25 enum {
  26         IFLISTSZ = 1024,
  27 };
  28
  29 static char aoe_iflist[IFLISTSZ];
  30 module_param_string(aoe_iflist, aoe_iflist, IFLISTSZ, 0600);
  31 MODULE_PARM_DESC(aoe_iflist, "aoe_iflist=\"dev1 [dev2 ...]\"\n");
  32
  33 #ifndef MODULE
  34 static int __init aoe_iflist_setup(char *str)
  35 {
  36         strncpy(aoe_iflist, str, IFLISTSZ);
  37         aoe_iflist[IFLISTSZ - 1] = '\0';
  38         return 1;
  39 }
  40
  41 __setup("aoe_iflist=", aoe_iflist_setup);
  42 #endif
  43
  44 int
  45 is_aoe_netif(struct net_device *ifp)
  46 {
  47         register char *p, *q;
  48         register int len;
  49
  50         if (aoe_iflist[0] == '\0')
  51                 return 1;
  52
  53         p = aoe_iflist + strspn(aoe_iflist, WHITESPACE);
  54         for (; *p; p = q + strspn(q, WHITESPACE)) {
  55                 q = p + strcspn(p, WHITESPACE);
  56                 if (q != p)
  57                         len = q - p;
  58                 else
  59                         len = strlen(p); /* last token in aoe_iflist */
  60
  61                 if (strlen(ifp->name) == len && !strncmp(ifp->name, p, len))
  62                         return 1;
  63                 if (q == p)
  64                         break;
  65         }
  66
  67         return 0;
  68 }
  69
  70 int
  71 set_aoe_iflist(const char __user *user_str, size_t size)
  72 {
  73         if (size >= IFLISTSZ)
  74                 return -EINVAL;
  75
  76         if (copy_from_user(aoe_iflist, user_str, size)) {
  77                 printk(KERN_INFO "aoe: %s: copy from user failed\n", __FUNCTION__);
  78                 return -EFAULT;
  79         }
  80         aoe_iflist[size] = 0x00;
  81         return 0;
  82 }
  83
  84 u64
  85 mac_addr(char addr[6])
  86 {
  87         __be64 n = 0;
  88         char *p = (char *) &n;
  89
  90         memcpy(p + 2, addr, 6); /* (sizeof addr != 6) */
  91
  92         return __be64_to_cpu(n);
  93 }
  94
  95 void
  96 aoenet_xmit(struct sk_buff *sl)
  97 {
  98         struct sk_buff *skb;
  99
 100         while ((skb = sl)) {
 101                 sl = sl->next;
 102                 skb->next = skb->prev = NULL;
 103                 dev_queue_xmit(skb);
 104         }
 105 }
 106
 107 /*
 108  * (1) len doesn't include the header by default.  I want this.
 109  */
 110 static int
 111 aoenet_rcv(struct sk_buff *skb, struct net_device *ifp, struct packet_type *pt, struct net_device *orig_dev)
 112 {
 113         struct aoe_hdr *h;
 114         u32 n;
 115
 116         skb = skb_share_check(skb, GFP_ATOMIC);
 117         if (skb == NULL)
 118                 return 0;
 119         if (skb_is_nonlinear(skb))
 120         if (skb_linearize(skb, GFP_ATOMIC) < 0)
 121                 goto exit;
 122         if (!is_aoe_netif(ifp))
 123                 goto exit;
 124         skb_push(skb, ETH_HLEN);        /* (1) */
 125
 126         h = (struct aoe_hdr *) skb->mac.raw;
 127         n = be32_to_cpu(h->tag);
 128         if ((h->verfl & AOEFL_RSP) == 0 || (n & 1<<31))
 129                 goto exit;
 130
 131         if (h->verfl & AOEFL_ERR) {
 132                 n = h->err;
 133                 if (n > NECODES)
 134                         n = 0;
 135                 if (net_ratelimit())
 136                         printk(KERN_ERR "aoe: aoenet_rcv: error packet from %d.%d; "
 137                                "ecode=%d '%s'\n",
 138                                be16_to_cpu(h->major), h->minor,
 139                                h->err, aoe_errlist[n]);
 140                 goto exit;
 141         }
 142
 143         switch (h->cmd) {
 144         case AOECMD_ATA:
 145                 aoecmd_ata_rsp(skb);
 146                 break;
 147         case AOECMD_CFG:
 148                 aoecmd_cfg_rsp(skb);
 149                 break;
 150         default:
 151                 printk(KERN_INFO "aoe: aoenet_rcv: unknown cmd %d\n", h->cmd);
 152         }
 153 exit:
 154         dev_kfree_skb(skb);
 155         return 0;
 156 }
 157
 158 static struct packet_type aoe_pt = {
 159         .type = __constant_htons(ETH_P_AOE),
 160         .func = aoenet_rcv,
 161 };
 162
 163 int __init
 164 aoenet_init(void)
 165 {
 166         dev_add_pack(&aoe_pt);
 167         return 0;
 168 }
 169
 170 void
 171 aoenet_exit(void)
 172 {
 173         dev_remove_pack(&aoe_pt);
 174 }
 175