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 & 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(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