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
17 static 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
27 enum {
28 IFLISTSZ = 1024,
29 };
30
31 static char aoe_iflist[IFLISTSZ];
32 module_param_string(aoe_iflist, aoe_iflist, IFLISTSZ, 0600);
33 MODULE_PARM_DESC(aoe_iflist, "aoe_iflist=\"dev1 [dev2 ...]\"\n");
34
35 #ifndef MODULE
36 static 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
46 int
47 is_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
72 int
73 set_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
86 unsigned long long
87 mac_addr(char addr[6])
88 {
89 __be64 n = 0;
90 char *p = (char *) &n;
91
92 memcpy(p + 2, addr, 6); /* (sizeof addr != 6) */
93
94 return (unsigned long long) __be64_to_cpu(n);
95 }
96
97 void
98 aoenet_xmit(struct sk_buff *sl)
99 {
100 struct sk_buff *skb;
101
102 while ((skb = sl)) {
103 sl = sl->next;
104 skb->next = skb->prev = NULL;
105 dev_queue_xmit(skb);
106 }
107 }
108
109 /*
110 * (1) len doesn't include the header by default. I want this.
111 */
112 static int
113 aoenet_rcv(struct sk_buff *skb, struct net_device *ifp, struct packet_type *pt, struct net_device *orig_dev)
114 {
115 struct aoe_hdr *h;
116 u32 n;
117
118 if (ifp->nd_net != &init_net)
119 goto exit;
120
121 skb = skb_share_check(skb, GFP_ATOMIC);
122 if (skb == NULL)
123 return 0;
124 if (skb_linearize(skb))
125 goto exit;
126 if (!is_aoe_netif(ifp))
127 goto exit;
128 skb_push(skb, ETH_HLEN); /* (1) */
129
130 h = (struct aoe_hdr *) skb_mac_header(skb);
131 n = be32_to_cpu(get_unaligned(&h->tag));
132 if ((h->verfl & AOEFL_RSP) == 0 || (n & 1<<31))
133 goto exit;
134
135 if (h->verfl & AOEFL_ERR) {
136 n = h->err;
137 if (n > NECODES)
138 n = 0;
139 if (net_ratelimit())
140 printk(KERN_ERR
141 "%s%d.%d@%s; ecode=%d '%s'\n",
142 "aoe: error packet from ",
143 be16_to_cpu(get_unaligned(&h->major)),
144 h->minor, skb->dev->name,
145 h->err, aoe_errlist[n]);
146 goto exit;
147 }
148
149 switch (h->cmd) {
150 case AOECMD_ATA:
151 aoecmd_ata_rsp(skb);
152 break;
153 case AOECMD_CFG:
154 aoecmd_cfg_rsp(skb);
155 break;
156 default:
157 printk(KERN_INFO "aoe: unknown cmd %d\n", h->cmd);
158 }
159 exit:
160 dev_kfree_skb(skb);
161 return 0;
162 }
163
164 static struct packet_type aoe_pt = {
165 .type = __constant_htons(ETH_P_AOE),
166 .func = aoenet_rcv,
167 };
168
169 int __init
170 aoenet_init(void)
171 {
172 dev_add_pack(&aoe_pt);
173 return 0;
174 }
175
176 void
177 aoenet_exit(void)
178 {
179 dev_remove_pack(&aoe_pt);
180 }
181
182
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