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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 two7 * licenses. You may choose to be licensed under the terms of the GNU8 * General Public License (GPL) Version 2, available from the file9 * COPYING in the main directory of this source tree, or the10 * OpenIB.org BSD license below:11 *12 * Redistribution and use in source and binary forms, with or13 * without modification, are permitted provided that the following14 * conditions are met:15 *16 * - Redistributions of source code must retain the above17 * copyright notice, this list of conditions and the following18 * disclaimer.19 *20 * - Redistributions in binary form must reproduce the above21 * copyright notice, this list of conditions and the following22 * disclaimer in the documentation and/or other materials23 * 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 OF27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE32 * SOFTWARE.33 */34 35#ifdef CONFIG_CHELSIO_T4_FCOE36 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 features64 * @netdev: net device65 *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 & 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->fcoe_mtu = true;85 86 netdev_features_change(netdev);87 88 fcoe->flags |= CXGB_FCOE_ENABLED;89 90 return 0;91}92 93/**94 * cxgb_fcoe_disable - disable FCoE offload95 * @netdev: net device96 *97 * Returns 0 on success or -EINVAL on failure.98 */99int cxgb_fcoe_disable(struct net_device *netdev)100{101 struct port_info *pi = netdev_priv(netdev);102 struct adapter *adap = pi->adapter;103 struct cxgb_fcoe *fcoe = &pi->fcoe;104 105 if (!(fcoe->flags & CXGB_FCOE_ENABLED))106 return -EINVAL;107 108 dev_info(adap->pdev_dev, "Disabling FCoE offload features\n");109 110 fcoe->flags &= ~CXGB_FCOE_ENABLED;111 112 netdev->features &= ~NETIF_F_FCOE_CRC;113 netdev->vlan_features &= ~NETIF_F_FCOE_CRC;114 netdev->fcoe_mtu = false;115 116 netdev_features_change(netdev);117 118 return 0;119}120#endif /* CONFIG_CHELSIO_T4_FCOE */121