cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cxgb4_fcoe.c (3558B)

      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->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 */