From 1a5f0c13d1a8808c2bdd00630818ed491e1719f5 Mon Sep 17 00:00:00 2001 From: Luciano Coelho Date: Fri, 23 May 2014 14:33:12 +0300 Subject: mac80211: add a single-transaction driver op to switch contexts In some cases, when the driver is already using all the channel contexts it can handle at once, we have to do an in-place switch (ie. we cannot afford using an extra context temporarily for the transaction). But some drivers may not support switching the channel context assigned to a vif on the fly (ie. without unassigning and assigning it) while others may only work if the context is changed on the fly, without unassigning it first. To allow these different scenarios, add a new driver operation that let's the driver decide how to handle an in-place switch. Signed-off-by: Luciano Coelho Signed-off-by: Johannes Berg --- net/mac80211/driver-ops.h | 53 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) (limited to 'net/mac80211/driver-ops.h') diff --git a/net/mac80211/driver-ops.h b/net/mac80211/driver-ops.h index 696ef78b1fb7..bd782dcffcc7 100644 --- a/net/mac80211/driver-ops.h +++ b/net/mac80211/driver-ops.h @@ -1048,6 +1048,59 @@ static inline void drv_unassign_vif_chanctx(struct ieee80211_local *local, trace_drv_return_void(local); } +static inline int +drv_switch_vif_chanctx(struct ieee80211_local *local, + struct ieee80211_vif_chanctx_switch *vifs, + int n_vifs, + enum ieee80211_chanctx_switch_mode mode) +{ + int ret = 0; + int i; + + if (!local->ops->switch_vif_chanctx) + return -EOPNOTSUPP; + + for (i = 0; i < n_vifs; i++) { + struct ieee80211_chanctx *new_ctx = + container_of(vifs[i].new_ctx, + struct ieee80211_chanctx, + conf); + struct ieee80211_chanctx *old_ctx = + container_of(vifs[i].old_ctx, + struct ieee80211_chanctx, + conf); + + WARN_ON_ONCE(!old_ctx->driver_present); + WARN_ON_ONCE((mode == CHANCTX_SWMODE_SWAP_CONTEXTS && + new_ctx->driver_present) || + (mode == CHANCTX_SWMODE_REASSIGN_VIF && + !new_ctx->driver_present)); + } + + trace_drv_switch_vif_chanctx(local, vifs, n_vifs, mode); + ret = local->ops->switch_vif_chanctx(&local->hw, + vifs, n_vifs, mode); + trace_drv_return_int(local, ret); + + if (!ret && mode == CHANCTX_SWMODE_SWAP_CONTEXTS) { + for (i = 0; i < n_vifs; i++) { + struct ieee80211_chanctx *new_ctx = + container_of(vifs[i].new_ctx, + struct ieee80211_chanctx, + conf); + struct ieee80211_chanctx *old_ctx = + container_of(vifs[i].old_ctx, + struct ieee80211_chanctx, + conf); + + new_ctx->driver_present = true; + old_ctx->driver_present = false; + } + } + + return ret; +} + static inline int drv_start_ap(struct ieee80211_local *local, struct ieee80211_sub_if_data *sdata) { -- cgit v1.2.3