drivers/net/ethernet/cisco/enic/enic_api.c

   1 /*
   2  * Copyright 2013 Cisco Systems, Inc.  All rights reserved.
   3  *
   4  * This program is free software; you may redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   9  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  10  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  11  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  12  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  13  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  14  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  15  * SOFTWARE.
  16  *
  17  */
  18
  19 #include <linux/netdevice.h>
  20 #include <linux/spinlock.h>
  21
  22 #include "vnic_dev.h"
  23 #include "vnic_devcmd.h"
  24
  25 #include "enic_res.h"
  26 #include "enic.h"
  27 #include "enic_api.h"
  28
  29 int enic_api_devcmd_proxy_by_index(struct net_device *netdev, int vf,
  30         enum vnic_devcmd_cmd cmd, u64 *a0, u64 *a1, int wait)
  31 {
  32         int err;
  33         struct enic *enic = netdev_priv(netdev);
  34         struct vnic_dev *vdev = enic->vdev;
  35
  36         spin_lock(&enic->enic_api_lock);
  37         while (enic->enic_api_busy) {
  38                 spin_unlock(&enic->enic_api_lock);
  39                 cpu_relax();
  40                 spin_lock(&enic->enic_api_lock);
  41         }
  42
  43         spin_lock_bh(&enic->devcmd_lock);
  44
  45         vnic_dev_cmd_proxy_by_index_start(vdev, vf);
  46         err = vnic_dev_cmd(vdev, cmd, a0, a1, wait);
  47         vnic_dev_cmd_proxy_end(vdev);
  48
  49         spin_unlock_bh(&enic->devcmd_lock);
  50         spin_unlock(&enic->enic_api_lock);
  51
  52         return err;
  53 }
  54 EXPORT_SYMBOL(enic_api_devcmd_proxy_by_index);