Initial import

1 files changed, 223 insertions, 0 deletions

diff --git a/drivers/block/aoe/aoenet.c b/drivers/block/aoe/aoenet.c
new file mode 100644
index 000000000..63773a905
--- /dev/null
+++ b/drivers/block/aoe/aoenet.c
@@ -0,0 +1,223 @@
+/* Copyright (c) 2013 Coraid, Inc.  See COPYING for GPL terms. */
+/*
+ * aoenet.c
+ * Ethernet portion of AoE driver
+ */
+
+#include <linux/gfp.h>
+#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...]");
+
+static wait_queue_head_t txwq;
+static struct ktstate kts;
+
+#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
+
+static spinlock_t txlock;
+static struct sk_buff_head skbtxq;
+
+/* enters with txlock held */
+static int
+tx(int id) __must_hold(&txlock)
+{
+	struct sk_buff *skb;
+	struct net_device *ifp;
+
+	while ((skb = skb_dequeue(&skbtxq))) {
+		spin_unlock_irq(&txlock);
+		ifp = skb->dev;
+		if (dev_queue_xmit(skb) == NET_XMIT_DROP && net_ratelimit())
+			pr_warn("aoe: packet could not be sent on %s.  %s\n",
+				ifp ? ifp->name : "netif",
+				"consider increasing tx_queue_len");
+		spin_lock_irq(&txlock);
+	}
+	return 0;
+}
+
+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;
+}
+
+void
+aoenet_xmit(struct sk_buff_head *queue)
+{
+	struct sk_buff *skb, *tmp;
+	ulong flags;
+
+	skb_queue_walk_safe(queue, skb, tmp) {
+		__skb_unlink(skb, queue);
+		spin_lock_irqsave(&txlock, flags);
+		skb_queue_tail(&skbtxq, skb);
+		spin_unlock_irqrestore(&txlock, flags);
+		wake_up(&txwq);
+	}
+}
+
+/*
+ * (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;
+	struct aoe_atahdr *ah;
+	u32 n;
+	int sn;
+
+	if (dev_net(ifp) != &init_net)
+		goto exit;
+
+	skb = skb_share_check(skb, GFP_ATOMIC);
+	if (skb == NULL)
+		return 0;
+	if (!is_aoe_netif(ifp))
+		goto exit;
+	skb_push(skb, ETH_HLEN);	/* (1) */
+	sn = sizeof(*h) + sizeof(*ah);
+	if (skb->len >= sn) {
+		sn -= skb_headlen(skb);
+		if (sn > 0 && !__pskb_pull_tail(skb, sn))
+			goto exit;
+	}
+	h = (struct aoe_hdr *) skb->data;
+	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:
+		/* ata_rsp may keep skb for later processing or give it back */
+		skb = 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 */
+		pr_info("aoe: unknown AoE command type 0x%02x\n", h->cmd);
+		break;
+	}
+
+	if (!skb)
+		return 0;
+exit:
+	dev_kfree_skb(skb);
+	return 0;
+}
+
+static struct packet_type aoe_pt __read_mostly = {
+	.type = __constant_htons(ETH_P_AOE),
+	.func = aoenet_rcv,
+};
+
+int __init
+aoenet_init(void)
+{
+	skb_queue_head_init(&skbtxq);
+	init_waitqueue_head(&txwq);
+	spin_lock_init(&txlock);
+	kts.lock = &txlock;
+	kts.fn = tx;
+	kts.waitq = &txwq;
+	kts.id = 0;
+	snprintf(kts.name, sizeof(kts.name), "aoe_tx%d", kts.id);
+	if (aoe_ktstart(&kts))
+		return -EAGAIN;
+	dev_add_pack(&aoe_pt);
+	return 0;
+}
+
+void
+aoenet_exit(void)
+{
+	aoe_ktstop(&kts);
+	skb_queue_purge(&skbtxq);
+	dev_remove_pack(&aoe_pt);
+}
+