enic: Add support for PORT_REQUEST_PREASSOCIATE_RR

Current enic code only supports ASSOCIATE and DISASSOCIATE port profile
operations. This patch adds enic support for port profile
PORT_REQUEST_PREASSOCIATE_RR operation. The VIC adapter (8021qbh) is capable
of handling port profile requests done in two steps namely PREASSOCIATE_RR
and ASSOCIATE today. The motivation to support PREASSOCIATE_RR comes mainly
from its use as an optimization during VM migration ie, to do resource
reservation on destination host before resources on source host are released.

PREASSOCIATE_RR is a VDP operation and according to the latest at IEEE,
8021qbh will also need to support VDP commands.

In addition to handling the new PORT_REQUEST_PREASSOCIATE_RR operation
this patch also does the below:
- Introduces handlers for PORT_REQUEST operations
- Moves most of the port profile handling code to new files enic_pp.[ch]
- Uses new fw devcmds for port profile operations

Signed-off-by: Roopa Prabhu <roprabhu@cisco.com>
Signed-off-by: David Wang <dwang2@cisco.com>
Signed-off-by: Christian Benvenuti <benve@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 264 insertions, 0 deletions

diff --git a/drivers/net/enic/enic_pp.c b/drivers/net/enic/enic_pp.c
new file mode 100644
index 00000000000..ffaa75dd1de
--- /dev/null
+++ b/drivers/net/enic/enic_pp.c
@@ -0,0 +1,264 @@
+/*
+ * Copyright 2011 Cisco Systems, Inc.  All rights reserved.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/rtnetlink.h>
+#include <net/ip.h>
+
+#include "vnic_vic.h"
+#include "enic_res.h"
+#include "enic.h"
+#include "enic_dev.h"
+
+static int enic_set_port_profile(struct enic *enic)
+{
+	struct net_device *netdev = enic->netdev;
+	struct vic_provinfo *vp;
+	const u8 oui[3] = VIC_PROVINFO_CISCO_OUI;
+	const u16 os_type = htons(VIC_GENERIC_PROV_OS_TYPE_LINUX);
+	char uuid_str[38];
+	char client_mac_str[18];
+	u8 *client_mac;
+	int err;
+
+	if (!(enic->pp.set & ENIC_SET_NAME) || !strlen(enic->pp.name))
+		return -EINVAL;
+
+	vp = vic_provinfo_alloc(GFP_KERNEL, oui,
+		VIC_PROVINFO_GENERIC_TYPE);
+	if (!vp)
+		return -ENOMEM;
+
+	VIC_PROVINFO_ADD_TLV(vp,
+		VIC_GENERIC_PROV_TLV_PORT_PROFILE_NAME_STR,
+		strlen(enic->pp.name) + 1, enic->pp.name);
+
+	if (!is_zero_ether_addr(enic->pp.mac_addr))
+		client_mac = enic->pp.mac_addr;
+	else
+		client_mac = netdev->dev_addr;
+
+	VIC_PROVINFO_ADD_TLV(vp,
+		VIC_GENERIC_PROV_TLV_CLIENT_MAC_ADDR,
+		ETH_ALEN, client_mac);
+
+	snprintf(client_mac_str, sizeof(client_mac_str), "%pM", client_mac);
+	VIC_PROVINFO_ADD_TLV(vp,
+		VIC_GENERIC_PROV_TLV_CLUSTER_PORT_UUID_STR,
+		sizeof(client_mac_str), client_mac_str);
+
+	if (enic->pp.set & ENIC_SET_INSTANCE) {
+		sprintf(uuid_str, "%pUB", enic->pp.instance_uuid);
+		VIC_PROVINFO_ADD_TLV(vp,
+			VIC_GENERIC_PROV_TLV_CLIENT_UUID_STR,
+			sizeof(uuid_str), uuid_str);
+	}
+
+	if (enic->pp.set & ENIC_SET_HOST) {
+		sprintf(uuid_str, "%pUB", enic->pp.host_uuid);
+		VIC_PROVINFO_ADD_TLV(vp,
+			VIC_GENERIC_PROV_TLV_HOST_UUID_STR,
+			sizeof(uuid_str), uuid_str);
+	}
+
+	VIC_PROVINFO_ADD_TLV(vp,
+		VIC_GENERIC_PROV_TLV_OS_TYPE,
+		sizeof(os_type), &os_type);
+
+	err = enic_dev_status_to_errno(enic_dev_init_prov2(enic, vp));
+
+add_tlv_failure:
+	vic_provinfo_free(vp);
+
+	return err;
+}
+
+static int enic_unset_port_profile(struct enic *enic)
+{
+	int err;
+
+	err = enic_vnic_dev_deinit(enic);
+	if (err)
+		return enic_dev_status_to_errno(err);
+
+	enic_reset_addr_lists(enic);
+
+	return 0;
+}
+
+static int enic_are_pp_different(struct enic_port_profile *pp1,
+		struct enic_port_profile *pp2)
+{
+	return strcmp(pp1->name, pp2->name) | !!memcmp(pp1->instance_uuid,
+		pp2->instance_uuid, PORT_UUID_MAX) |
+		!!memcmp(pp1->host_uuid, pp2->host_uuid, PORT_UUID_MAX) |
+		!!memcmp(pp1->mac_addr, pp2->mac_addr, ETH_ALEN);
+}
+
+static int enic_pp_preassociate(struct enic *enic,
+	struct enic_port_profile *prev_pp, int *restore_pp);
+static int enic_pp_disassociate(struct enic *enic,
+	struct enic_port_profile *prev_pp, int *restore_pp);
+static int enic_pp_preassociate_rr(struct enic *enic,
+	struct enic_port_profile *prev_pp, int *restore_pp);
+static int enic_pp_associate(struct enic *enic,
+	struct enic_port_profile *prev_pp, int *restore_pp);
+
+static int (*enic_pp_handlers[])(struct enic *enic,
+		struct enic_port_profile *prev_state, int *restore_pp) = {
+	[PORT_REQUEST_PREASSOCIATE]	= enic_pp_preassociate,
+	[PORT_REQUEST_PREASSOCIATE_RR]	= enic_pp_preassociate_rr,
+	[PORT_REQUEST_ASSOCIATE]	= enic_pp_associate,
+	[PORT_REQUEST_DISASSOCIATE]	= enic_pp_disassociate,
+};
+
+static const int enic_pp_handlers_count =
+			sizeof(enic_pp_handlers)/sizeof(*enic_pp_handlers);
+
+static int enic_pp_preassociate(struct enic *enic,
+	struct enic_port_profile *prev_pp, int *restore_pp)
+{
+	return -EOPNOTSUPP;
+}
+
+static int enic_pp_disassociate(struct enic *enic,
+	struct enic_port_profile *prev_pp, int *restore_pp)
+{
+	return enic_unset_port_profile(enic);
+}
+
+static int enic_pp_preassociate_rr(struct enic *enic,
+	struct enic_port_profile *prev_pp, int *restore_pp)
+{
+	int err;
+	int active = 0;
+
+	if (enic->pp.request != PORT_REQUEST_ASSOCIATE) {
+		/* If pre-associate is not part of an associate.
+		We always disassociate first */
+		err = enic_pp_handlers[PORT_REQUEST_DISASSOCIATE](enic,
+			prev_pp, restore_pp);
+		if (err)
+			return err;
+
+		*restore_pp = 0;
+	}
+
+	*restore_pp = 0;
+
+	err = enic_set_port_profile(enic);
+	if (err)
+		return err;
+
+	/* If pre-associate is not part of an associate. */
+	if (enic->pp.request != PORT_REQUEST_ASSOCIATE)
+		err = enic_dev_status_to_errno(enic_dev_enable2(enic, active));
+
+	return err;
+}
+
+static int enic_pp_associate(struct enic *enic,
+	struct enic_port_profile *prev_pp, int *restore_pp)
+{
+	int err;
+	int active = 1;
+
+	/* Check if a pre-associate was called before */
+	if (prev_pp->request != PORT_REQUEST_PREASSOCIATE_RR ||
+		(prev_pp->request == PORT_REQUEST_PREASSOCIATE_RR &&
+			enic_are_pp_different(prev_pp, &enic->pp))) {
+		err = enic_pp_handlers[PORT_REQUEST_DISASSOCIATE](
+			enic, prev_pp, restore_pp);
+		if (err)
+			return err;
+
+		*restore_pp = 0;
+	}
+
+	err = enic_pp_handlers[PORT_REQUEST_PREASSOCIATE_RR](
+			enic, prev_pp, restore_pp);
+	if (err)
+		return err;
+
+	*restore_pp = 0;
+
+	return enic_dev_status_to_errno(enic_dev_enable2(enic, active));
+}
+
+int enic_process_set_pp_request(struct enic *enic,
+	struct enic_port_profile *prev_pp, int *restore_pp)
+{
+	if (enic->pp.request < enic_pp_handlers_count
+		&& enic_pp_handlers[enic->pp.request])
+		return enic_pp_handlers[enic->pp.request](enic,
+			prev_pp, restore_pp);
+	else
+		return -EOPNOTSUPP;
+}
+
+int enic_process_get_pp_request(struct enic *enic, int request,
+	u16 *response)
+{
+	int err, status = ERR_SUCCESS;
+
+	switch (request) {
+
+	case PORT_REQUEST_PREASSOCIATE_RR:
+	case PORT_REQUEST_ASSOCIATE:
+		err = enic_dev_enable2_done(enic, &status);
+		break;
+
+	case PORT_REQUEST_DISASSOCIATE:
+		err = enic_dev_deinit_done(enic, &status);
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	if (err)
+		status = err;
+
+	switch (status) {
+	case ERR_SUCCESS:
+		*response = PORT_PROFILE_RESPONSE_SUCCESS;
+		break;
+	case ERR_EINVAL:
+		*response = PORT_PROFILE_RESPONSE_INVALID;
+		break;
+	case ERR_EBADSTATE:
+		*response = PORT_PROFILE_RESPONSE_BADSTATE;
+		break;
+	case ERR_ENOMEM:
+		*response = PORT_PROFILE_RESPONSE_INSUFFICIENT_RESOURCES;
+		break;
+	case ERR_EINPROGRESS:
+		*response = PORT_PROFILE_RESPONSE_INPROGRESS;
+		break;
+	default:
+		*response = PORT_PROFILE_RESPONSE_ERROR;
+		break;
+	}
+
+	return 0;
+}