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 static struct sk_buff *
  96 skb_check(struct sk_buff *skb)
  97 {
  98         if (skb_is_nonlinear(skb))
  99         if ((skb = skb_share_check(skb, GFP_ATOMIC)))
 100         if (skb_linearize(skb, GFP_ATOMIC) < 0) {
 101                 dev_kfree_skb(skb);
 102                 return NULL;
 103         }
 104         return skb;
 105 }
 106
 107 void
 108 aoenet_xmit(struct sk_buff *sl)
 109 {
 110         struct sk_buff *skb;
 111
 112         while ((skb = sl)) {
 113                 sl = sl->next;
 114                 skb->next = skb->prev = NULL;
 115                 dev_queue_xmit(skb);
 116         }
 117 }
 118
 119 /*
 120  * (1) len doesn't include the header by default.  I want this.
 121  */
 122 static int
 123 aoenet_rcv(struct sk_buff *skb, struct net_device *ifp, struct packet_type *pt, struct net_device *orig_dev)
 124 {
 125         struct aoe_hdr *h;
 126         u32 n;
 127
 128         skb = skb_check(skb);
 129         if (!skb)
 130                 return 0;
 131
 132         if (!is_aoe_netif(ifp))
 133                 goto exit;
 134
 135         //skb->len += ETH_HLEN; /* (1) */
 136         skb_push(skb, ETH_HLEN);        /* (1) */
 137
 138         h = (struct aoe_hdr *) skb->mac.raw;
 139         n = be32_to_cpu(h->tag);
 140         if ((h->verfl & AOEFL_RSP) == 0 || (n & 1<<31))
 141                 goto exit;
 142
 143         if (h->verfl & AOEFL_ERR) {
 144                 n = h->err;
 145                 if (n > NECODES)
 146                         n = 0;
 147                 if (net_ratelimit())
 148                         printk(KERN_ERR "aoe: aoenet_rcv: error packet from %d.%d; "
 149                                "ecode=%d '%s'\n",
 150                                be16_to_cpu(h->major), h->minor,
 151                                h->err, aoe_errlist[n]);
 152                 goto exit;
 153         }
 154
 155         switch (h->cmd) {
 156         case AOECMD_ATA:
 157                 aoecmd_ata_rsp(skb);
 158                 break;
 159         case AOECMD_CFG:
 160                 aoecmd_cfg_rsp(skb);
 161                 break;
 162         default:
 163                 printk(KERN_INFO "aoe: aoenet_rcv: unknown cmd %d\n", h->cmd);
 164         }
 165 exit:
 166         dev_kfree_skb(skb);
 167         return 0;
 168 }
 169
 170 static struct packet_type aoe_pt = {
 171         .type = __constant_htons(ETH_P_AOE),
 172         .func = aoenet_rcv,
 173 };
 174
 175 int __init
 176 aoenet_init(void)
 177 {
 178         dev_add_pack(&aoe_pt);
 179         return 0;
 180 }
 181
 182 void
 183 aoenet_exit(void)
 184 {
 185         dev_remove_pack(&aoe_pt);
 186 }
 187