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) 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 } 187 188