1/*
2 * This file is part of the Chelsio T4 Ethernet driver for Linux.
3 *
4 * Copyright (c) 2015 Chelsio Communications, Inc. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses.  You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 *     Redistribution and use in source and binary forms, with or
13 *     without modification, are permitted provided that the following
14 *     conditions are met:
15 *
16 *      - Redistributions of source code must retain the above
17 *        copyright notice, this list of conditions and the following
18 *        disclaimer.
19 *
20 *      - Redistributions in binary form must reproduce the above
21 *        copyright notice, this list of conditions and the following
22 *        disclaimer in the documentation and/or other materials
23 *        provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 */
34
35#ifdef CONFIG_CHELSIO_T4_FCOE
36
37#include <scsi/fc/fc_fs.h>
38#include <scsi/libfcoe.h>
39#include "cxgb4.h"
40
41bool cxgb_fcoe_sof_eof_supported(struct adapter *adap, struct sk_buff *skb)
42{
43	struct fcoe_hdr *fcoeh = (struct fcoe_hdr *)skb_network_header(skb);
44	u8 sof = fcoeh->fcoe_sof;
45	u8 eof = 0;
46
47	if ((sof != FC_SOF_I3) && (sof != FC_SOF_N3)) {
48		dev_err(adap->pdev_dev, "Unsupported SOF 0x%x\n", sof);
49		return false;
50	}
51
52	skb_copy_bits(skb, skb->len - 4, &eof, 1);
53
54	if ((eof != FC_EOF_N) && (eof != FC_EOF_T)) {
55		dev_err(adap->pdev_dev, "Unsupported EOF 0x%x\n", eof);
56		return false;
57	}
58
59	return true;
60}
61
62/**
63 * cxgb_fcoe_enable - enable FCoE offload features
64 * @netdev: net device
65 *
66 * Returns 0 on success or -EINVAL on failure.
67 */
68int cxgb_fcoe_enable(struct net_device *netdev)
69{
70	struct port_info *pi = netdev_priv(netdev);
71	struct adapter *adap = pi->adapter;
72	struct cxgb_fcoe *fcoe = &pi->fcoe;
73
74	if (is_t4(adap->params.chip))
75		return -EINVAL;
76
77	if (!(adap->flags & FULL_INIT_DONE))
78		return -EINVAL;
79
80	dev_info(adap->pdev_dev, "Enabling FCoE offload features\n");
81
82	netdev->features |= NETIF_F_FCOE_CRC;
83	netdev->vlan_features |= NETIF_F_FCOE_CRC;
84	netdev->features |= NETIF_F_FCOE_MTU;
85	netdev->vlan_features |= NETIF_F_FCOE_MTU;
86
87	netdev_features_change(netdev);
88
89	fcoe->flags |= CXGB_FCOE_ENABLED;
90
91	return 0;
92}
93
94/**
95 * cxgb_fcoe_disable - disable FCoE offload
96 * @netdev: net device
97 *
98 * Returns 0 on success or -EINVAL on failure.
99 */
100int cxgb_fcoe_disable(struct net_device *netdev)
101{
102	struct port_info *pi = netdev_priv(netdev);
103	struct adapter *adap = pi->adapter;
104	struct cxgb_fcoe *fcoe = &pi->fcoe;
105
106	if (!(fcoe->flags & CXGB_FCOE_ENABLED))
107		return -EINVAL;
108
109	dev_info(adap->pdev_dev, "Disabling FCoE offload features\n");
110
111	fcoe->flags &= ~CXGB_FCOE_ENABLED;
112
113	netdev->features &= ~NETIF_F_FCOE_CRC;
114	netdev->vlan_features &= ~NETIF_F_FCOE_CRC;
115	netdev->features &= ~NETIF_F_FCOE_MTU;
116	netdev->vlan_features &= ~NETIF_F_FCOE_MTU;
117
118	netdev_features_change(netdev);
119
120	return 0;
121}
122#endif /* CONFIG_CHELSIO_T4_FCOE */
123