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/* Copyright (c) 2004 Coraid, Inc. See COPYING for GPL terms. */
/*
* aoenet.c
* Ethernet portion of AoE driver
*/
#include <linux/hdreg.h>
#include <linux/blkdev.h>
#include <linux/netdevice.h>
#include "aoe.h"
#define NECODES 5
static char *aoe_errlist[] =
{
"no such error",
"unrecognized command code",
"bad argument parameter",
"device unavailable",
"config string present",
"unsupported version"
};
enum {
IFLISTSZ = 1024,
};
static char aoe_iflist[IFLISTSZ];
int
is_aoe_netif(struct net_device *ifp)
{
register char *p, *q;
register int len;
if (aoe_iflist[0] == '\0')
return 1;
for (p = aoe_iflist; *p; p = q + strspn(q, WHITESPACE)) {
q = p + strcspn(p, WHITESPACE);
if (q != p)
len = q - p;
else
len = strlen(p); /* last token in aoe_iflist */
if (strlen(ifp->name) == len && !strncmp(ifp->name, p, len))
return 1;
if (q == p)
break;
}
return 0;
}
int
set_aoe_iflist(const char __user *user_str, size_t size)
{
if (size >= IFLISTSZ)
return -EINVAL;
if (copy_from_user(aoe_iflist, user_str, size)) {
printk(KERN_INFO "aoe: %s: copy from user failed\n", __FUNCTION__);
return -EFAULT;
}
aoe_iflist[size] = 0x00;
return 0;
}
u64
mac_addr(char addr[6])
{
__be64 n = 0;
char *p = (char *) &n;
memcpy(p + 2, addr, 6); /* (sizeof addr != 6) */
return __be64_to_cpu(n);
}
static struct sk_buff *
skb_check(struct sk_buff *skb)
{
if (skb_is_nonlinear(skb))
if ((skb = skb_share_check(skb, GFP_ATOMIC)))
if (skb_linearize(skb, GFP_ATOMIC) < 0) {
dev_kfree_skb(skb);
return NULL;
}
return skb;
}
void
aoenet_xmit(struct sk_buff *sl)
{
struct sk_buff *skb;
while ((skb = sl)) {
sl = sl->next;
skb->next = skb->prev = NULL;
dev_queue_xmit(skb);
}
}
/*
* (1) len doesn't include the header by default. I want this.
*/
static int
aoenet_rcv(struct sk_buff *skb, struct net_device *ifp, struct packet_type *pt)
{
struct aoe_hdr *h;
u32 n;
skb = skb_check(skb);
if (!skb)
return 0;
if (!is_aoe_netif(ifp))
goto exit;
//skb->len += ETH_HLEN; /* (1) */
skb_push(skb, ETH_HLEN); /* (1) */
h = (struct aoe_hdr *) skb->mac.raw;
n = be32_to_cpu(h->tag);
if ((h->verfl & AOEFL_RSP) == 0 || (n & 1<<31))
goto exit;
if (h->verfl & AOEFL_ERR) {
n = h->err;
if (n > NECODES)
n = 0;
if (net_ratelimit())
printk(KERN_ERR "aoe: aoenet_rcv: error packet from %d.%d; "
"ecode=%d '%s'\n",
be16_to_cpu(h->major), h->minor,
h->err, aoe_errlist[n]);
goto exit;
}
switch (h->cmd) {
case AOECMD_ATA:
aoecmd_ata_rsp(skb);
break;
case AOECMD_CFG:
aoecmd_cfg_rsp(skb);
break;
default:
printk(KERN_INFO "aoe: aoenet_rcv: unknown cmd %d\n", h->cmd);
}
exit:
dev_kfree_skb(skb);
return 0;
}
static struct packet_type aoe_pt = {
.type = __constant_htons(ETH_P_AOE),
.func = aoenet_rcv,
};
int __init
aoenet_init(void)
{
dev_add_pack(&aoe_pt);
return 0;
}
void
aoenet_exit(void)
{
dev_remove_pack(&aoe_pt);
}
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