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
 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 & 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 offload
 95 * @netdev: net device
 96 *
 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 */