drivers/net/mlx5/linux/mlx5_vlan_os.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright 2015 6WIND S.A.
   3  * Copyright 2015 Mellanox Technologies, Ltd
   4  */
   5
   6 #include <stddef.h>
   7 #include <errno.h>
   8 #include <stdint.h>
   9 #include <unistd.h>
  10
  11 /*
  12  * Not needed by this file; included to work around the lack of off_t
  13  * definition for mlx5dv.h with unpatched rdma-core versions.
  14  */
  15 #include <sys/types.h>
  16
  17 #include <ethdev_driver.h>
  18 #include <rte_common.h>
  19 #include <rte_malloc.h>
  20 #include <rte_hypervisor.h>
  21
  22 #include <mlx5.h>
  23 #include <mlx5_nl.h>
  24 #include <mlx5_malloc.h>
  25
  26 /*
  27  * Release VLAN network device, created for VM workaround.
  28  *
  29  * @param[in] dev
  30  *   Ethernet device object, Netlink context provider.
  31  * @param[in] vlan
  32  *   Object representing the network device to release.
  33  */
  34 void
  35 mlx5_vlan_vmwa_release(struct rte_eth_dev *dev,
  36                             struct mlx5_vf_vlan *vlan)
  37 {
  38         struct mlx5_priv *priv = dev->data->dev_private;
  39         struct mlx5_nl_vlan_vmwa_context *vmwa = priv->vmwa_context;
  40         struct mlx5_nl_vlan_dev *vlan_dev = &vmwa->vlan_dev[0];
  41
  42         MLX5_ASSERT(vlan->created);
  43         MLX5_ASSERT(priv->vmwa_context);
  44         if (!vlan->created || !vmwa)
  45                 return;
  46         vlan->created = 0;
  47         rte_spinlock_lock(&vmwa->sl);
  48         MLX5_ASSERT(vlan_dev[vlan->tag].refcnt);
  49         if (--vlan_dev[vlan->tag].refcnt == 0 &&
  50             vlan_dev[vlan->tag].ifindex) {
  51                 mlx5_nl_vlan_vmwa_delete(vmwa, vlan_dev[vlan->tag].ifindex);
  52                 vlan_dev[vlan->tag].ifindex = 0;
  53         }
  54         rte_spinlock_unlock(&vmwa->sl);
  55 }
  56
  57 /**
  58  * Acquire VLAN interface with specified tag for VM workaround.
  59  *
  60  * @param[in] dev
  61  *   Ethernet device object, Netlink context provider.
  62  * @param[in] vlan
  63  *   Object representing the network device to acquire.
  64  */
  65 void
  66 mlx5_vlan_vmwa_acquire(struct rte_eth_dev *dev,
  67                             struct mlx5_vf_vlan *vlan)
  68 {
  69         struct mlx5_priv *priv = dev->data->dev_private;
  70         struct mlx5_nl_vlan_vmwa_context *vmwa = priv->vmwa_context;
  71         struct mlx5_nl_vlan_dev *vlan_dev = &vmwa->vlan_dev[0];
  72
  73         MLX5_ASSERT(!vlan->created);
  74         MLX5_ASSERT(priv->vmwa_context);
  75         if (vlan->created || !vmwa)
  76                 return;
  77         rte_spinlock_lock(&vmwa->sl);
  78         if (vlan_dev[vlan->tag].refcnt == 0) {
  79                 MLX5_ASSERT(!vlan_dev[vlan->tag].ifindex);
  80                 vlan_dev[vlan->tag].ifindex =
  81                         mlx5_nl_vlan_vmwa_create(vmwa, vmwa->vf_ifindex,
  82                                                  vlan->tag);
  83         }
  84         if (vlan_dev[vlan->tag].ifindex) {
  85                 vlan_dev[vlan->tag].refcnt++;
  86                 vlan->created = 1;
  87         }
  88         rte_spinlock_unlock(&vmwa->sl);
  89 }
  90
  91 /*
  92  * Create per ethernet device VLAN VM workaround context
  93  *
  94  * @param dev
  95  *   Pointer to Ethernet device structure.
  96  * @param ifindex
  97  *   Interface index.
  98  *
  99  * @Return
 100  *   Pointer to mlx5_nl_vlan_vmwa_context
 101  */
 102 void *
 103 mlx5_vlan_vmwa_init(struct rte_eth_dev *dev, uint32_t ifindex)
 104 {
 105         struct mlx5_priv *priv = dev->data->dev_private;
 106         struct mlx5_nl_vlan_vmwa_context *vmwa;
 107         enum rte_hypervisor hv_type;
 108
 109         /* Do not engage workaround over PF. */
 110         if (!priv->sh->dev_cap.vf)
 111                 return NULL;
 112         /* Check whether there is desired virtual environment */
 113         hv_type = rte_hypervisor_get();
 114         switch (hv_type) {
 115         case RTE_HYPERVISOR_UNKNOWN:
 116         case RTE_HYPERVISOR_VMWARE:
 117                 /*
 118                  * The "white list" of configurations
 119                  * to engage the workaround.
 120                  */
 121                 break;
 122         default:
 123                 /*
 124                  * The configuration is not found in the "white list".
 125                  * We should not engage the VLAN workaround.
 126                  */
 127                 return NULL;
 128         }
 129         vmwa = mlx5_malloc(MLX5_MEM_ZERO, sizeof(*vmwa), sizeof(uint32_t),
 130                            SOCKET_ID_ANY);
 131         if (!vmwa) {
 132                 DRV_LOG(WARNING,
 133                         "Can not allocate memory"
 134                         " for VLAN workaround context");
 135                 return NULL;
 136         }
 137         rte_spinlock_init(&vmwa->sl);
 138         vmwa->nl_socket = mlx5_nl_init(NETLINK_ROUTE);
 139         if (vmwa->nl_socket < 0) {
 140                 DRV_LOG(WARNING,
 141                         "Can not create Netlink socket"
 142                         " for VLAN workaround context");
 143                 mlx5_free(vmwa);
 144                 return NULL;
 145         }
 146         vmwa->vf_ifindex = ifindex;
 147         /* Cleanup for existing VLAN devices. */
 148         return vmwa;
 149 }
 150
 151 /*
 152  * Destroy per ethernet device VLAN VM workaround context
 153  *
 154  * @param dev
 155  *   Pointer to VM context
 156  */
 157 void
 158 mlx5_vlan_vmwa_exit(void *vmctx)
 159 {
 160         unsigned int i;
 161
 162         struct mlx5_nl_vlan_vmwa_context *vmwa = vmctx;
 163         /* Delete all remaining VLAN devices. */
 164         for (i = 0; i < RTE_DIM(vmwa->vlan_dev); i++) {
 165                 if (vmwa->vlan_dev[i].ifindex)
 166                         mlx5_nl_vlan_vmwa_delete(vmwa,
 167                                                  vmwa->vlan_dev[i].ifindex);
 168         }
 169         if (vmwa->nl_socket >= 0)
 170                 close(vmwa->nl_socket);
 171         mlx5_free(vmwa);
 172 }