LXR linux/drivers/net/ethernet/chelsio/cxgb4/cxgb4

   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
  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 features
  64 * @netdev: net device
  65 *
  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 & 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 */
 100int 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