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/gfp.h>
8 #include <linux/hdreg.h>
9 #include <linux/blkdev.h>
10 #include <linux/netdevice.h>
11 #include <linux/moduleparam.h>
12 #include <net/net_namespace.h>
13 #include <asm/unaligned.h>
14 #include "aoe.h"
15
16 #define NECODES 5
17
18 static char *aoe_errlist[] =
19 {
20 "no such error",
21 "unrecognized command code",
22 "bad argument parameter",
23 "device unavailable",
24 "config string present",
25 "unsupported version"
26 };
27
28 enum {
29 IFLISTSZ = 1024,
30 };
31
32 static char aoe_iflist[IFLISTSZ];
33 module_param_string(aoe_iflist, aoe_iflist, IFLISTSZ, 0600);
34 MODULE_PARM_DESC(aoe_iflist, "aoe_iflist=\"dev1 [dev2 ...]\"");
35
36 #ifndef MODULE
aoe_iflist_setup(char * str)37 static int __init aoe_iflist_setup(char *str)
38 {
39 strncpy(aoe_iflist, str, IFLISTSZ);
40 aoe_iflist[IFLISTSZ - 1] = '\0';
41 return 1;
42 }
43
44 __setup("aoe_iflist=", aoe_iflist_setup);
45 #endif
46
47 int
is_aoe_netif(struct net_device * ifp)48 is_aoe_netif(struct net_device *ifp)
49 {
50 register char *p, *q;
51 register int len;
52
53 if (aoe_iflist[0] == '\0')
54 return 1;
55
56 p = aoe_iflist + strspn(aoe_iflist, WHITESPACE);
57 for (; *p; p = q + strspn(q, WHITESPACE)) {
58 q = p + strcspn(p, WHITESPACE);
59 if (q != p)
60 len = q - p;
61 else
62 len = strlen(p); /* last token in aoe_iflist */
63
64 if (strlen(ifp->name) == len && !strncmp(ifp->name, p, len))
65 return 1;
66 if (q == p)
67 break;
68 }
69
70 return 0;
71 }
72
73 int
set_aoe_iflist(const char __user * user_str,size_t size)74 set_aoe_iflist(const char __user *user_str, size_t size)
75 {
76 if (size >= IFLISTSZ)
77 return -EINVAL;
78
79 if (copy_from_user(aoe_iflist, user_str, size)) {
80 printk(KERN_INFO "aoe: copy from user failed\n");
81 return -EFAULT;
82 }
83 aoe_iflist[size] = 0x00;
84 return 0;
85 }
86
87 void
aoenet_xmit(struct sk_buff_head * queue)88 aoenet_xmit(struct sk_buff_head *queue)
89 {
90 struct sk_buff *skb, *tmp;
91
92 skb_queue_walk_safe(queue, skb, tmp) {
93 __skb_unlink(skb, queue);
94 dev_queue_xmit(skb);
95 }
96 }
97
98 /*
99 * (1) len doesn't include the header by default. I want this.
100 */
101 static int
aoenet_rcv(struct sk_buff * skb,struct net_device * ifp,struct packet_type * pt,struct net_device * orig_dev)102 aoenet_rcv(struct sk_buff *skb, struct net_device *ifp, struct packet_type *pt, struct net_device *orig_dev)
103 {
104 struct aoe_hdr *h;
105 u32 n;
106
107 if (dev_net(ifp) != &init_net)
108 goto exit;
109
110 skb = skb_share_check(skb, GFP_ATOMIC);
111 if (skb == NULL)
112 return 0;
113 if (skb_linearize(skb))
114 goto exit;
115 if (!is_aoe_netif(ifp))
116 goto exit;
117 skb_push(skb, ETH_HLEN); /* (1) */
118
119 h = (struct aoe_hdr *) skb_mac_header(skb);
120 n = get_unaligned_be32(&h->tag);
121 if ((h->verfl & AOEFL_RSP) == 0 || (n & 1<<31))
122 goto exit;
123
124 if (h->verfl & AOEFL_ERR) {
125 n = h->err;
126 if (n > NECODES)
127 n = 0;
128 if (net_ratelimit())
129 printk(KERN_ERR
130 "%s%d.%d@%s; ecode=%d '%s'\n",
131 "aoe: error packet from ",
132 get_unaligned_be16(&h->major),
133 h->minor, skb->dev->name,
134 h->err, aoe_errlist[n]);
135 goto exit;
136 }
137
138 switch (h->cmd) {
139 case AOECMD_ATA:
140 aoecmd_ata_rsp(skb);
141 break;
142 case AOECMD_CFG:
143 aoecmd_cfg_rsp(skb);
144 break;
145 default:
146 if (h->cmd >= AOECMD_VEND_MIN)
147 break; /* don't complain about vendor commands */
148 printk(KERN_INFO "aoe: unknown cmd %d\n", h->cmd);
149 }
150 exit:
151 dev_kfree_skb(skb);
152 return 0;
153 }
154
155 static struct packet_type aoe_pt __read_mostly = {
156 .type = __constant_htons(ETH_P_AOE),
157 .func = aoenet_rcv,
158 };
159
160 int __init
aoenet_init(void)161 aoenet_init(void)
162 {
163 dev_add_pack(&aoe_pt);
164 return 0;
165 }
166
167 void
aoenet_exit(void)168 aoenet_exit(void)
169 {
170 dev_remove_pack(&aoe_pt);
171 }
172
173