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 
41 bool 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  */
68 int 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  */
100 int 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