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path: root/drivers/block/aoe/aoenet.c
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Diffstat (limited to 'drivers/block/aoe/aoenet.c')
-rw-r--r--drivers/block/aoe/aoenet.c182
1 files changed, 182 insertions, 0 deletions
diff --git a/drivers/block/aoe/aoenet.c b/drivers/block/aoe/aoenet.c
new file mode 100644
index 0000000..b67629a
--- /dev/null
+++ b/drivers/block/aoe/aoenet.c
@@ -0,0 +1,182 @@
+/* Copyright (c) 2007 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 <linux/moduleparam.h>
+#include <net/net_namespace.h>
+#include <asm/unaligned.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];
+module_param_string(aoe_iflist, aoe_iflist, IFLISTSZ, 0600);
+MODULE_PARM_DESC(aoe_iflist, "aoe_iflist=\"dev1 [dev2 ...]\"");
+
+#ifndef MODULE
+static int __init aoe_iflist_setup(char *str)
+{
+ strncpy(aoe_iflist, str, IFLISTSZ);
+ aoe_iflist[IFLISTSZ - 1] = '\0';
+ return 1;
+}
+
+__setup("aoe_iflist=", aoe_iflist_setup);
+#endif
+
+int
+is_aoe_netif(struct net_device *ifp)
+{
+ register char *p, *q;
+ register int len;
+
+ if (aoe_iflist[0] == '\0')
+ return 1;
+
+ p = aoe_iflist + strspn(aoe_iflist, WHITESPACE);
+ for (; *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: copy from user failed\n");
+ return -EFAULT;
+ }
+ aoe_iflist[size] = 0x00;
+ return 0;
+}
+
+unsigned long long
+mac_addr(char addr[6])
+{
+ __be64 n = 0;
+ char *p = (char *) &n;
+
+ memcpy(p + 2, addr, 6); /* (sizeof addr != 6) */
+
+ return (unsigned long long) __be64_to_cpu(n);
+}
+
+void
+aoenet_xmit(struct sk_buff_head *queue)
+{
+ struct sk_buff *skb, *tmp;
+
+ skb_queue_walk_safe(queue, skb, tmp) {
+ __skb_unlink(skb, queue);
+ 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 net_device *orig_dev)
+{
+ struct aoe_hdr *h;
+ u32 n;
+
+ if (dev_net(ifp) != &init_net)
+ goto exit;
+
+ skb = skb_share_check(skb, GFP_ATOMIC);
+ if (skb == NULL)
+ return 0;
+ if (skb_linearize(skb))
+ goto exit;
+ if (!is_aoe_netif(ifp))
+ goto exit;
+ skb_push(skb, ETH_HLEN); /* (1) */
+
+ h = (struct aoe_hdr *) skb_mac_header(skb);
+ n = get_unaligned_be32(&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
+ "%s%d.%d@%s; ecode=%d '%s'\n",
+ "aoe: error packet from ",
+ get_unaligned_be16(&h->major),
+ h->minor, skb->dev->name,
+ 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:
+ if (h->cmd >= AOECMD_VEND_MIN)
+ break; /* don't complain about vendor commands */
+ printk(KERN_INFO "aoe: 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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