173 lines
3.2 KiB
C
173 lines
3.2 KiB
C
/* Copyright (c) 2007 Coraid, Inc. See COPYING for GPL terms. */
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/*
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* aoenet.c
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* Ethernet portion of AoE driver
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*/
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#include <linux/gfp.h>
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#include <linux/hdreg.h>
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#include <linux/blkdev.h>
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#include <linux/netdevice.h>
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#include <linux/moduleparam.h>
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#include <net/net_namespace.h>
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#include <asm/unaligned.h>
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#include "aoe.h"
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#define NECODES 5
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static char *aoe_errlist[] =
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{
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"no such error",
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"unrecognized command code",
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"bad argument parameter",
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"device unavailable",
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"config string present",
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"unsupported version"
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};
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enum {
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IFLISTSZ = 1024,
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};
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static char aoe_iflist[IFLISTSZ];
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module_param_string(aoe_iflist, aoe_iflist, IFLISTSZ, 0600);
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MODULE_PARM_DESC(aoe_iflist, "aoe_iflist=\"dev1 [dev2 ...]\"");
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#ifndef MODULE
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static int __init aoe_iflist_setup(char *str)
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{
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strncpy(aoe_iflist, str, IFLISTSZ);
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aoe_iflist[IFLISTSZ - 1] = '\0';
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return 1;
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}
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__setup("aoe_iflist=", aoe_iflist_setup);
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#endif
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int
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is_aoe_netif(struct net_device *ifp)
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{
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register char *p, *q;
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register int len;
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if (aoe_iflist[0] == '\0')
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return 1;
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p = aoe_iflist + strspn(aoe_iflist, WHITESPACE);
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for (; *p; p = q + strspn(q, WHITESPACE)) {
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q = p + strcspn(p, WHITESPACE);
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if (q != p)
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len = q - p;
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else
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len = strlen(p); /* last token in aoe_iflist */
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if (strlen(ifp->name) == len && !strncmp(ifp->name, p, len))
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return 1;
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if (q == p)
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break;
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}
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return 0;
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}
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int
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set_aoe_iflist(const char __user *user_str, size_t size)
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{
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if (size >= IFLISTSZ)
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return -EINVAL;
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if (copy_from_user(aoe_iflist, user_str, size)) {
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printk(KERN_INFO "aoe: copy from user failed\n");
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return -EFAULT;
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}
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aoe_iflist[size] = 0x00;
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return 0;
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}
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void
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aoenet_xmit(struct sk_buff_head *queue)
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{
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struct sk_buff *skb, *tmp;
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skb_queue_walk_safe(queue, skb, tmp) {
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__skb_unlink(skb, queue);
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dev_queue_xmit(skb);
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}
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}
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/*
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* (1) len doesn't include the header by default. I want this.
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*/
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static int
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aoenet_rcv(struct sk_buff *skb, struct net_device *ifp, struct packet_type *pt, struct net_device *orig_dev)
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{
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struct aoe_hdr *h;
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u32 n;
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if (dev_net(ifp) != &init_net)
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goto exit;
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skb = skb_share_check(skb, GFP_ATOMIC);
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if (skb == NULL)
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return 0;
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if (skb_linearize(skb))
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goto exit;
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if (!is_aoe_netif(ifp))
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goto exit;
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skb_push(skb, ETH_HLEN); /* (1) */
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h = (struct aoe_hdr *) skb_mac_header(skb);
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n = get_unaligned_be32(&h->tag);
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if ((h->verfl & AOEFL_RSP) == 0 || (n & 1<<31))
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goto exit;
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if (h->verfl & AOEFL_ERR) {
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n = h->err;
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if (n > NECODES)
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n = 0;
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if (net_ratelimit())
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printk(KERN_ERR
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"%s%d.%d@%s; ecode=%d '%s'\n",
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"aoe: error packet from ",
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get_unaligned_be16(&h->major),
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h->minor, skb->dev->name,
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h->err, aoe_errlist[n]);
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goto exit;
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}
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switch (h->cmd) {
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case AOECMD_ATA:
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aoecmd_ata_rsp(skb);
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break;
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case AOECMD_CFG:
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aoecmd_cfg_rsp(skb);
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break;
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default:
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if (h->cmd >= AOECMD_VEND_MIN)
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break; /* don't complain about vendor commands */
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printk(KERN_INFO "aoe: unknown cmd %d\n", h->cmd);
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}
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exit:
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dev_kfree_skb(skb);
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return 0;
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}
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static struct packet_type aoe_pt __read_mostly = {
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.type = __constant_htons(ETH_P_AOE),
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.func = aoenet_rcv,
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};
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int __init
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aoenet_init(void)
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{
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dev_add_pack(&aoe_pt);
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return 0;
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}
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void
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aoenet_exit(void)
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{
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dev_remove_pack(&aoe_pt);
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}
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