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 <rte_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         MLX5_ASSERT(vlan_dev[vlan->tag].refcnt);
  48         if (--vlan_dev[vlan->tag].refcnt == 0 &&
  49             vlan_dev[vlan->tag].ifindex) {
  50                 mlx5_nl_vlan_vmwa_delete(vmwa, vlan_dev[vlan->tag].ifindex);
  51                 vlan_dev[vlan->tag].ifindex = 0;
  52         }
  53 }
  54
  55 /**
  56  * Acquire VLAN interface with specified tag for VM workaround.
  57  *
  58  * @param[in] dev
  59  *   Ethernet device object, Netlink context provider.
  60  * @param[in] vlan
  61  *   Object representing the network device to acquire.
  62  */
  63 void
  64 mlx5_vlan_vmwa_acquire(struct rte_eth_dev *dev,
  65                             struct mlx5_vf_vlan *vlan)
  66 {
  67         struct mlx5_priv *priv = dev->data->dev_private;
  68         struct mlx5_nl_vlan_vmwa_context *vmwa = priv->vmwa_context;
  69         struct mlx5_nl_vlan_dev *vlan_dev = &vmwa->vlan_dev[0];
  70
  71         MLX5_ASSERT(!vlan->created);
  72         MLX5_ASSERT(priv->vmwa_context);
  73         if (vlan->created || !vmwa)
  74                 return;
  75         if (vlan_dev[vlan->tag].refcnt == 0) {
  76                 MLX5_ASSERT(!vlan_dev[vlan->tag].ifindex);
  77                 vlan_dev[vlan->tag].ifindex =
  78                         mlx5_nl_vlan_vmwa_create(vmwa, vmwa->vf_ifindex,
  79                                                  vlan->tag);
  80         }
  81         if (vlan_dev[vlan->tag].ifindex) {
  82                 vlan_dev[vlan->tag].refcnt++;
  83                 vlan->created = 1;
  84         }
  85 }
  86
  87 /*
  88  * Create per ethernet device VLAN VM workaround context
  89  *
  90  * @param dev
  91  *   Pointer to Ethernet device structure.
  92  * @param ifindex
  93  *   Interface index.
  94  *
  95  * @Return
  96  *   Pointer to mlx5_nl_vlan_vmwa_context
  97  */
  98 void *
  99 mlx5_vlan_vmwa_init(struct rte_eth_dev *dev, uint32_t ifindex)
 100 {
 101         struct mlx5_priv *priv = dev->data->dev_private;
 102         struct mlx5_dev_config *config = &priv->config;
 103         struct mlx5_nl_vlan_vmwa_context *vmwa;
 104         enum rte_hypervisor hv_type;
 105
 106         /* Do not engage workaround over PF. */
 107         if (!config->vf)
 108                 return NULL;
 109         /* Check whether there is desired virtual environment */
 110         hv_type = rte_hypervisor_get();
 111         switch (hv_type) {
 112         case RTE_HYPERVISOR_UNKNOWN:
 113         case RTE_HYPERVISOR_VMWARE:
 114                 /*
 115                  * The "white list" of configurations
 116                  * to engage the workaround.
 117                  */
 118                 break;
 119         default:
 120                 /*
 121                  * The configuration is not found in the "white list".
 122                  * We should not engage the VLAN workaround.
 123                  */
 124                 return NULL;
 125         }
 126         vmwa = mlx5_malloc(MLX5_MEM_ZERO, sizeof(*vmwa), sizeof(uint32_t),
 127                            SOCKET_ID_ANY);
 128         if (!vmwa) {
 129                 DRV_LOG(WARNING,
 130                         "Can not allocate memory"
 131                         " for VLAN workaround context");
 132                 return NULL;
 133         }
 134         vmwa->nl_socket = mlx5_nl_init(NETLINK_ROUTE);
 135         if (vmwa->nl_socket < 0) {
 136                 DRV_LOG(WARNING,
 137                         "Can not create Netlink socket"
 138                         " for VLAN workaround context");
 139                 mlx5_free(vmwa);
 140                 return NULL;
 141         }
 142         vmwa->vf_ifindex = ifindex;
 143         /* Cleanup for existing VLAN devices. */
 144         return vmwa;
 145 }
 146
 147 /*
 148  * Destroy per ethernet device VLAN VM workaround context
 149  *
 150  * @param dev
 151  *   Pointer to VM context
 152  */
 153 void
 154 mlx5_vlan_vmwa_exit(void *vmctx)
 155 {
 156         unsigned int i;
 157
 158         struct mlx5_nl_vlan_vmwa_context *vmwa = vmctx;
 159         /* Delete all remaining VLAN devices. */
 160         for (i = 0; i < RTE_DIM(vmwa->vlan_dev); i++) {
 161                 if (vmwa->vlan_dev[i].ifindex)
 162                         mlx5_nl_vlan_vmwa_delete(vmwa,
 163                                                  vmwa->vlan_dev[i].ifindex);
 164         }
 165         if (vmwa->nl_socket >= 0)
 166                 close(vmwa->nl_socket);
 167         mlx5_free(vmwa);
 168 }