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 ...]\"");
34
35 #ifndef MODULE
aoe_iflist_setup(char * str)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
is_aoe_netif(struct net_device * ifp)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
set_aoe_iflist(const char __user * user_str,size_t size)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 void
aoenet_xmit(struct sk_buff_head * queue)87 aoenet_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 */
100 static int
aoenet_rcv(struct sk_buff * skb,struct net_device * ifp,struct packet_type * pt,struct net_device * orig_dev)101 aoenet_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 }
149 exit:
150 dev_kfree_skb(skb);
151 return 0;
152 }
153
154 static struct packet_type aoe_pt = {
155 .type = __constant_htons(ETH_P_AOE),
156 .func = aoenet_rcv,
157 };
158
159 int __init
aoenet_init(void)160 aoenet_init(void)
161 {
162 dev_add_pack(&aoe_pt);
163 return 0;
164 }
165
166 void
aoenet_exit(void)167 aoenet_exit(void)
168 {
169 dev_remove_pack(&aoe_pt);
170 }
171
172