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, offset: skb->len - 4, to: &eof, len: 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(dev: netdev); |
71 | struct adapter *adap = pi->adapter; |
72 | struct cxgb_fcoe *fcoe = &pi->fcoe; |
73 | |
74 | if (is_t4(chip: adap->params.chip)) |
75 | return -EINVAL; |
76 | |
77 | if (!(adap->flags & CXGB4_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(dev: 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(dev: 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(dev: netdev); |
119 | |
120 | return 0; |
121 | } |
122 | #endif /* CONFIG_CHELSIO_T4_FCOE */ |
123 | |