drivers/net/ethernet/chelsio/cxgb4/cxgb4_fcoe.c

   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 */