mac80211: introduce new ieee80211_ops

Introduce channel context driver methods. The channel
on a context channel is immutable, but the channel type
and other properties can change.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

3 files changed, 196 insertions, 0 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index ab1b5bafb568..d9d2119f0828 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -2353,6 +2353,16 @@ enum ieee80211_rate_control_changed {
  *      The callback will be called before each transmission and upon return
  *      mac80211 will transmit the frame right away.
  *      The callback is optional and can (should!) sleep.
+ *
+ * @add_chanctx: Notifies device driver about new channel context creation.
+ * @remove_chanctx: Notifies device driver about channel context destruction.
+ * @change_chanctx: Notifies device driver about channel context changes that
+ *      may happen when combining different virtual interfaces on the same
+ *      channel context with different settings
+ * @assign_vif_chanctx: Notifies device driver about channel context being bound
+ *      to vif. Possible use is for hw queue remapping.
+ * @unassign_vif_chanctx: Notifies device driver about channel context being
+ *      unbound from vif.
  */
 struct ieee80211_ops {
         void (*tx)(struct ieee80211_hw *hw,
@@ -2497,6 +2507,20 @@ struct ieee80211_ops {
 
         void    (*mgd_prepare_tx)(struct ieee80211_hw *hw,
                                   struct ieee80211_vif *vif);
+
+        int (*add_chanctx)(struct ieee80211_hw *hw,
+                           struct ieee80211_chanctx_conf *ctx);
+        void (*remove_chanctx)(struct ieee80211_hw *hw,
+                               struct ieee80211_chanctx_conf *ctx);
+        void (*change_chanctx)(struct ieee80211_hw *hw,
+                               struct ieee80211_chanctx_conf *ctx,
+                               u32 changed);
+        int (*assign_vif_chanctx)(struct ieee80211_hw *hw,
+                                  struct ieee80211_vif *vif,
+                                  struct ieee80211_chanctx_conf *ctx);
+        void (*unassign_vif_chanctx)(struct ieee80211_hw *hw,
+                                     struct ieee80211_vif *vif,
+                                     struct ieee80211_chanctx_conf *ctx);
 };
 
 /**
diff --git a/net/mac80211/driver-ops.h b/net/mac80211/driver-ops.h
index da9003b20004..77407b31e1ff 100644
--- a/net/mac80211/driver-ops.h
+++ b/net/mac80211/driver-ops.h
@@ -871,4 +871,69 @@ static inline void drv_mgd_prepare_tx(struct ieee80211_local *local,
                 local->ops->mgd_prepare_tx(&local->hw, &sdata->vif);
         trace_drv_return_void(local);
 }
+
+static inline int drv_add_chanctx(struct ieee80211_local *local,
+                                  struct ieee80211_chanctx *ctx)
+{
+        int ret = -EOPNOTSUPP;
+
+        trace_drv_add_chanctx(local, ctx);
+        if (local->ops->add_chanctx)
+                ret = local->ops->add_chanctx(&local->hw, &ctx->conf);
+        trace_drv_return_int(local, ret);
+
+        return ret;
+}
+
+static inline void drv_remove_chanctx(struct ieee80211_local *local,
+                                      struct ieee80211_chanctx *ctx)
+{
+        trace_drv_remove_chanctx(local, ctx);
+        if (local->ops->remove_chanctx)
+                local->ops->remove_chanctx(&local->hw, &ctx->conf);
+        trace_drv_return_void(local);
+}
+
+static inline void drv_change_chanctx(struct ieee80211_local *local,
+                                      struct ieee80211_chanctx *ctx,
+                                      u32 changed)
+{
+        trace_drv_change_chanctx(local, ctx, changed);
+        if (local->ops->change_chanctx)
+                local->ops->change_chanctx(&local->hw, &ctx->conf, changed);
+        trace_drv_return_void(local);
+}
+
+static inline int drv_assign_vif_chanctx(struct ieee80211_local *local,
+                                         struct ieee80211_sub_if_data *sdata,
+                                         struct ieee80211_chanctx *ctx)
+{
+        int ret = 0;
+
+        check_sdata_in_driver(sdata);
+
+        trace_drv_assign_vif_chanctx(local, sdata, ctx);
+        if (local->ops->assign_vif_chanctx)
+                ret = local->ops->assign_vif_chanctx(&local->hw,
+                                                     &sdata->vif,
+                                                     &ctx->conf);
+        trace_drv_return_int(local, ret);
+
+        return ret;
+}
+
+static inline void drv_unassign_vif_chanctx(struct ieee80211_local *local,
+                                            struct ieee80211_sub_if_data *sdata,
+                                            struct ieee80211_chanctx *ctx)
+{
+        check_sdata_in_driver(sdata);
+
+        trace_drv_unassign_vif_chanctx(local, sdata, ctx);
+        if (local->ops->unassign_vif_chanctx)
+                local->ops->unassign_vif_chanctx(&local->hw,
+                                                 &sdata->vif,
+                                                 &ctx->conf);
+        trace_drv_return_void(local);
+}
+
 #endif /* __MAC80211_DRIVER_OPS */
diff --git a/net/mac80211/trace.h b/net/mac80211/trace.h
index 18d9c8a52e9e..a3f5fe2a84a8 100644
--- a/net/mac80211/trace.h
+++ b/net/mac80211/trace.h
@@ -28,6 +28,15 @@
 #define VIF_PR_FMT      " vif:%s(%d%s)"
 #define VIF_PR_ARG      __get_str(vif_name), __entry->vif_type, __entry->p2p ? "/p2p" : ""
 
+#define CHANCTX_ENTRY   __field(int, freq)                                      \
+                        __field(int, chantype)
+#define CHANCTX_ASSIGN  __entry->freq = ctx->conf.channel->center_freq;         \
+                        __entry->chantype = ctx->conf.channel_type
+#define CHANCTX_PR_FMT  " freq:%d MHz chantype:%d"
+#define CHANCTX_PR_ARG  __entry->freq, __entry->chantype
+
+
+
 /*
  * Tracing for driver callbacks.
  */
@@ -1256,6 +1265,104 @@ DEFINE_EVENT(local_sdata_evt, drv_mgd_prepare_tx,
         TP_ARGS(local, sdata)
 );
 
+DECLARE_EVENT_CLASS(local_chanctx,
+        TP_PROTO(struct ieee80211_local *local,
+                 struct ieee80211_chanctx *ctx),
+
+        TP_ARGS(local, ctx),
+
+        TP_STRUCT__entry(
+                LOCAL_ENTRY
+                CHANCTX_ENTRY
+        ),
+
+        TP_fast_assign(
+                LOCAL_ASSIGN;
+                CHANCTX_ASSIGN;
+        ),
+
+        TP_printk(
+                LOCAL_PR_FMT CHANCTX_PR_FMT,
+                LOCAL_PR_ARG, CHANCTX_PR_ARG
+        )
+);
+
+DEFINE_EVENT(local_chanctx, drv_add_chanctx,
+        TP_PROTO(struct ieee80211_local *local,
+                 struct ieee80211_chanctx *ctx),
+        TP_ARGS(local, ctx)
+);
+
+DEFINE_EVENT(local_chanctx, drv_remove_chanctx,
+        TP_PROTO(struct ieee80211_local *local,
+                 struct ieee80211_chanctx *ctx),
+        TP_ARGS(local, ctx)
+);
+
+TRACE_EVENT(drv_change_chanctx,
+        TP_PROTO(struct ieee80211_local *local,
+                 struct ieee80211_chanctx *ctx,
+                 u32 changed),
+
+        TP_ARGS(local, ctx, changed),
+
+        TP_STRUCT__entry(
+                LOCAL_ENTRY
+                CHANCTX_ENTRY
+                __field(u32, changed)
+        ),
+
+        TP_fast_assign(
+                LOCAL_ASSIGN;
+                CHANCTX_ASSIGN;
+                __entry->changed = changed;
+        ),
+
+        TP_printk(
+                LOCAL_PR_FMT CHANCTX_PR_FMT " changed:%#x",
+                LOCAL_PR_ARG, CHANCTX_PR_ARG, __entry->changed
+        )
+);
+
+DECLARE_EVENT_CLASS(local_sdata_chanctx,
+        TP_PROTO(struct ieee80211_local *local,
+                 struct ieee80211_sub_if_data *sdata,
+                 struct ieee80211_chanctx *ctx),
+
+        TP_ARGS(local, sdata, ctx),
+
+        TP_STRUCT__entry(
+                LOCAL_ENTRY
+                VIF_ENTRY
+                CHANCTX_ENTRY
+        ),
+
+        TP_fast_assign(
+                LOCAL_ASSIGN;
+                VIF_ASSIGN;
+                CHANCTX_ASSIGN;
+        ),
+
+        TP_printk(
+                LOCAL_PR_FMT VIF_PR_FMT CHANCTX_PR_FMT,
+                LOCAL_PR_ARG, VIF_PR_ARG, CHANCTX_PR_ARG
+        )
+);
+
+DEFINE_EVENT(local_sdata_chanctx, drv_assign_vif_chanctx,
+        TP_PROTO(struct ieee80211_local *local,
+                 struct ieee80211_sub_if_data *sdata,
+                 struct ieee80211_chanctx *ctx),
+        TP_ARGS(local, sdata, ctx)
+);
+
+DEFINE_EVENT(local_sdata_chanctx, drv_unassign_vif_chanctx,
+        TP_PROTO(struct ieee80211_local *local,
+                 struct ieee80211_sub_if_data *sdata,
+                 struct ieee80211_chanctx *ctx),
+        TP_ARGS(local, sdata, ctx)
+);
+
 /*
  * Tracing for API calls that drivers call.
  */