drivers/net/ethernet/netronome/nfp/nfp_app.c

   1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
   2 /* Copyright (C) 2017-2018 Netronome Systems, Inc. */
   3
   4 #include <linux/bug.h>
   5 #include <linux/lockdep.h>
   6 #include <linux/rcupdate.h>
   7 #include <linux/skbuff.h>
   8 #include <linux/slab.h>
   9
  10 #include "nfpcore/nfp_cpp.h"
  11 #include "nfpcore/nfp_nffw.h"
  12 #include "nfp_app.h"
  13 #include "nfp_main.h"
  14 #include "nfp_net.h"
  15 #include "nfp_net_repr.h"
  16 #include "nfp_port.h"
  17
  18 static const struct nfp_app_type *apps[] = {
  19         [NFP_APP_CORE_NIC]      = &app_nic,
  20 #ifdef CONFIG_BPF_SYSCALL
  21         [NFP_APP_BPF_NIC]       = &app_bpf,
  22 #else
  23         [NFP_APP_BPF_NIC]       = &app_nic,
  24 #endif
  25 #ifdef CONFIG_NFP_APP_FLOWER
  26         [NFP_APP_FLOWER_NIC]    = &app_flower,
  27 #endif
  28 #ifdef CONFIG_NFP_APP_ABM_NIC
  29         [NFP_APP_ACTIVE_BUFFER_MGMT_NIC] = &app_abm,
  30 #endif
  31 };
  32
  33 void nfp_check_rhashtable_empty(void *ptr, void *arg)
  34 {
  35         WARN_ON_ONCE(1);
  36 }
  37
  38 struct nfp_app *nfp_app_from_netdev(struct net_device *netdev)
  39 {
  40         if (nfp_netdev_is_nfp_net(netdev)) {
  41                 struct nfp_net *nn = netdev_priv(netdev);
  42
  43                 return nn->app;
  44         }
  45
  46         if (nfp_netdev_is_nfp_repr(netdev)) {
  47                 struct nfp_repr *repr = netdev_priv(netdev);
  48
  49                 return repr->app;
  50         }
  51
  52         WARN(1, "Unknown netdev type for nfp_app\n");
  53
  54         return NULL;
  55 }
  56
  57 const char *nfp_app_mip_name(struct nfp_app *app)
  58 {
  59         if (!app || !app->pf->mip)
  60                 return "";
  61         return nfp_mip_name(app->pf->mip);
  62 }
  63
  64 int nfp_app_ndo_init(struct net_device *netdev)
  65 {
  66         struct nfp_app *app = nfp_app_from_netdev(netdev);
  67
  68         if (!app || !app->type->ndo_init)
  69                 return 0;
  70         return app->type->ndo_init(app, netdev);
  71 }
  72
  73 void nfp_app_ndo_uninit(struct net_device *netdev)
  74 {
  75         struct nfp_app *app = nfp_app_from_netdev(netdev);
  76
  77         if (app && app->type->ndo_uninit)
  78                 app->type->ndo_uninit(app, netdev);
  79 }
  80
  81 u64 *nfp_app_port_get_stats(struct nfp_port *port, u64 *data)
  82 {
  83         if (!port || !port->app || !port->app->type->port_get_stats)
  84                 return data;
  85         return port->app->type->port_get_stats(port->app, port, data);
  86 }
  87
  88 int nfp_app_port_get_stats_count(struct nfp_port *port)
  89 {
  90         if (!port || !port->app || !port->app->type->port_get_stats_count)
  91                 return 0;
  92         return port->app->type->port_get_stats_count(port->app, port);
  93 }
  94
  95 u8 *nfp_app_port_get_stats_strings(struct nfp_port *port, u8 *data)
  96 {
  97         if (!port || !port->app || !port->app->type->port_get_stats_strings)
  98                 return data;
  99         return port->app->type->port_get_stats_strings(port->app, port, data);
 100 }
 101
 102 struct sk_buff *
 103 nfp_app_ctrl_msg_alloc(struct nfp_app *app, unsigned int size, gfp_t priority)
 104 {
 105         struct sk_buff *skb;
 106
 107         if (nfp_app_ctrl_has_meta(app))
 108                 size += 8;
 109
 110         skb = alloc_skb(size, priority);
 111         if (!skb)
 112                 return NULL;
 113
 114         if (nfp_app_ctrl_has_meta(app))
 115                 skb_reserve(skb, 8);
 116
 117         return skb;
 118 }
 119
 120 struct nfp_reprs *
 121 nfp_reprs_get_locked(struct nfp_app *app, enum nfp_repr_type type)
 122 {
 123         return rcu_dereference_protected(app->reprs[type],
 124                                          lockdep_is_held(&app->pf->lock));
 125 }
 126
 127 struct nfp_reprs *
 128 nfp_app_reprs_set(struct nfp_app *app, enum nfp_repr_type type,
 129                   struct nfp_reprs *reprs)
 130 {
 131         struct nfp_reprs *old;
 132
 133         old = nfp_reprs_get_locked(app, type);
 134         rtnl_lock();
 135         rcu_assign_pointer(app->reprs[type], reprs);
 136         rtnl_unlock();
 137
 138         return old;
 139 }
 140
 141 static void
 142 nfp_app_netdev_feat_change(struct nfp_app *app, struct net_device *netdev)
 143 {
 144         struct nfp_net *nn;
 145         unsigned int type;
 146
 147         if (!nfp_netdev_is_nfp_net(netdev))
 148                 return;
 149         nn = netdev_priv(netdev);
 150         if (nn->app != app)
 151                 return;
 152
 153         for (type = 0; type < __NFP_REPR_TYPE_MAX; type++) {
 154                 struct nfp_reprs *reprs;
 155                 unsigned int i;
 156
 157                 reprs = rtnl_dereference(app->reprs[type]);
 158                 if (!reprs)
 159                         continue;
 160
 161                 for (i = 0; i < reprs->num_reprs; i++) {
 162                         struct net_device *repr;
 163
 164                         repr = rtnl_dereference(reprs->reprs[i]);
 165                         if (!repr)
 166                                 continue;
 167
 168                         nfp_repr_transfer_features(repr, netdev);
 169                 }
 170         }
 171 }
 172
 173 static int
 174 nfp_app_netdev_event(struct notifier_block *nb, unsigned long event, void *ptr)
 175 {
 176         struct net_device *netdev;
 177         struct nfp_app *app;
 178
 179         netdev = netdev_notifier_info_to_dev(ptr);
 180         app = container_of(nb, struct nfp_app, netdev_nb);
 181
 182         /* Handle events common code is interested in */
 183         switch (event) {
 184         case NETDEV_FEAT_CHANGE:
 185                 nfp_app_netdev_feat_change(app, netdev);
 186                 break;
 187         }
 188
 189         /* Call offload specific handlers */
 190         if (app->type->netdev_event)
 191                 return app->type->netdev_event(app, netdev, event, ptr);
 192         return NOTIFY_DONE;
 193 }
 194
 195 int nfp_app_start(struct nfp_app *app, struct nfp_net *ctrl)
 196 {
 197         int err;
 198
 199         app->ctrl = ctrl;
 200
 201         if (app->type->start) {
 202                 err = app->type->start(app);
 203                 if (err)
 204                         return err;
 205         }
 206
 207         app->netdev_nb.notifier_call = nfp_app_netdev_event;
 208         err = register_netdevice_notifier(&app->netdev_nb);
 209         if (err)
 210                 goto err_app_stop;
 211
 212         return 0;
 213
 214 err_app_stop:
 215         if (app->type->stop)
 216                 app->type->stop(app);
 217         return err;
 218 }
 219
 220 void nfp_app_stop(struct nfp_app *app)
 221 {
 222         unregister_netdevice_notifier(&app->netdev_nb);
 223
 224         if (app->type->stop)
 225                 app->type->stop(app);
 226 }
 227
 228 struct nfp_app *nfp_app_alloc(struct nfp_pf *pf, enum nfp_app_id id)
 229 {
 230         struct nfp_app *app;
 231
 232         if (id >= ARRAY_SIZE(apps) || !apps[id]) {
 233                 nfp_err(pf->cpp, "unknown FW app ID 0x%02hhx, driver too old or support for FW not built in\n", id);
 234                 return ERR_PTR(-EINVAL);
 235         }
 236
 237         if (WARN_ON(!apps[id]->name || !apps[id]->vnic_alloc))
 238                 return ERR_PTR(-EINVAL);
 239         if (WARN_ON(!apps[id]->ctrl_msg_rx && apps[id]->ctrl_msg_rx_raw))
 240                 return ERR_PTR(-EINVAL);
 241
 242         app = kzalloc(sizeof(*app), GFP_KERNEL);
 243         if (!app)
 244                 return ERR_PTR(-ENOMEM);
 245
 246         app->pf = pf;
 247         app->cpp = pf->cpp;
 248         app->pdev = pf->pdev;
 249         app->type = apps[id];
 250
 251         return app;
 252 }
 253
 254 void nfp_app_free(struct nfp_app *app)
 255 {
 256         kfree(app);
 257 }