1 /* Copyright (c) 2012 Coraid, Inc. See COPYING for GPL terms. */
4 * Ethernet portion of AoE driver
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>
18 static char *aoe_errlist[] =
21 "unrecognized command code",
22 "bad argument parameter",
24 "config string present",
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 ...]\"");
36 static wait_queue_head_t txwq;
37 static struct ktstate kts;
40 static int __init aoe_iflist_setup(char *str)
42 strncpy(aoe_iflist, str, IFLISTSZ);
43 aoe_iflist[IFLISTSZ - 1] = '\0';
47 __setup("aoe_iflist=", aoe_iflist_setup);
50 static spinlock_t txlock;
51 static struct sk_buff_head skbtxq;
53 /* enters with txlock held */
59 while ((skb = skb_dequeue(&skbtxq))) {
60 spin_unlock_irq(&txlock);
62 spin_lock_irq(&txlock);
68 is_aoe_netif(struct net_device *ifp)
73 if (aoe_iflist[0] == '\0')
76 p = aoe_iflist + strspn(aoe_iflist, WHITESPACE);
77 for (; *p; p = q + strspn(q, WHITESPACE)) {
78 q = p + strcspn(p, WHITESPACE);
82 len = strlen(p); /* last token in aoe_iflist */
84 if (strlen(ifp->name) == len && !strncmp(ifp->name, p, len))
94 set_aoe_iflist(const char __user *user_str, size_t size)
99 if (copy_from_user(aoe_iflist, user_str, size)) {
100 printk(KERN_INFO "aoe: copy from user failed\n");
103 aoe_iflist[size] = 0x00;
108 aoenet_xmit(struct sk_buff_head *queue)
110 struct sk_buff *skb, *tmp;
113 skb_queue_walk_safe(queue, skb, tmp) {
114 __skb_unlink(skb, queue);
115 spin_lock_irqsave(&txlock, flags);
116 skb_queue_tail(&skbtxq, skb);
117 spin_unlock_irqrestore(&txlock, flags);
123 * (1) len doesn't include the header by default. I want this.
126 aoenet_rcv(struct sk_buff *skb, struct net_device *ifp, struct packet_type *pt, struct net_device *orig_dev)
129 struct aoe_atahdr *ah;
133 if (dev_net(ifp) != &init_net)
136 skb = skb_share_check(skb, GFP_ATOMIC);
139 if (!is_aoe_netif(ifp))
141 skb_push(skb, ETH_HLEN); /* (1) */
142 sn = sizeof(*h) + sizeof(*ah);
143 if (skb->len >= sn) {
144 sn -= skb_headlen(skb);
145 if (sn > 0 && !__pskb_pull_tail(skb, sn))
148 h = (struct aoe_hdr *) skb->data;
149 n = get_unaligned_be32(&h->tag);
150 if ((h->verfl & AOEFL_RSP) == 0 || (n & 1<<31))
153 if (h->verfl & AOEFL_ERR) {
159 "%s%d.%d@%s; ecode=%d '%s'\n",
160 "aoe: error packet from ",
161 get_unaligned_be16(&h->major),
162 h->minor, skb->dev->name,
163 h->err, aoe_errlist[n]);
169 /* ata_rsp may keep skb for later processing or give it back */
170 skb = aoecmd_ata_rsp(skb);
176 if (h->cmd >= AOECMD_VEND_MIN)
177 break; /* don't complain about vendor commands */
178 pr_info("aoe: unknown AoE command type 0x%02x\n", h->cmd);
189 static struct packet_type aoe_pt __read_mostly = {
190 .type = __constant_htons(ETH_P_AOE),
197 skb_queue_head_init(&skbtxq);
198 init_waitqueue_head(&txwq);
199 spin_lock_init(&txlock);
204 if (aoe_ktstart(&kts))
206 dev_add_pack(&aoe_pt);
214 skb_queue_purge(&skbtxq);
215 dev_remove_pack(&aoe_pt);