Commit f23a4780 authored by Arik Nemtsov's avatar Arik Nemtsov Committed by John W. Linville

mac80211: support hardware TX fragmentation offload

The lower driver is notified when the fragmentation threshold changes
and upon a reconfig of the interface.

If the driver supports hardware TX fragmentation, don't fragment
packets in the stack.
Signed-off-by: default avatarArik Nemtsov <arik@wizery.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent ca4a0831
......@@ -1652,6 +1652,11 @@ enum ieee80211_ampdu_mlme_action {
* and IV16) for the given key from hardware.
* The callback must be atomic.
*
* @set_frag_threshold: Configuration of fragmentation threshold. Assign this
* if the device does fragmentation by itself; if this callback is
* implemented then the stack will not do fragmentation.
* The callback can sleep.
*
* @set_rts_threshold: Configuration of RTS threshold (if device needs it)
* The callback can sleep.
*
......@@ -1765,6 +1770,7 @@ struct ieee80211_ops {
struct ieee80211_low_level_stats *stats);
void (*get_tkip_seq)(struct ieee80211_hw *hw, u8 hw_key_idx,
u32 *iv32, u16 *iv16);
int (*set_frag_threshold)(struct ieee80211_hw *hw, u32 value);
int (*set_rts_threshold)(struct ieee80211_hw *hw, u32 value);
int (*sta_add)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
struct ieee80211_sta *sta);
......
......@@ -1299,6 +1299,13 @@ static int ieee80211_set_wiphy_params(struct wiphy *wiphy, u32 changed)
struct ieee80211_local *local = wiphy_priv(wiphy);
int err;
if (changed & WIPHY_PARAM_FRAG_THRESHOLD) {
err = drv_set_frag_threshold(local, wiphy->frag_threshold);
if (err)
return err;
}
if (changed & WIPHY_PARAM_COVERAGE_CLASS) {
err = drv_set_coverage_class(local, wiphy->coverage_class);
......
......@@ -233,6 +233,20 @@ static inline void drv_get_tkip_seq(struct ieee80211_local *local,
trace_drv_get_tkip_seq(local, hw_key_idx, iv32, iv16);
}
static inline int drv_set_frag_threshold(struct ieee80211_local *local,
u32 value)
{
int ret = 0;
might_sleep();
trace_drv_set_frag_threshold(local, value);
if (local->ops->set_frag_threshold)
ret = local->ops->set_frag_threshold(&local->hw, value);
trace_drv_return_int(local, ret);
return ret;
}
static inline int drv_set_rts_threshold(struct ieee80211_local *local,
u32 value)
{
......
......@@ -531,6 +531,27 @@ TRACE_EVENT(drv_get_tkip_seq,
)
);
TRACE_EVENT(drv_set_frag_threshold,
TP_PROTO(struct ieee80211_local *local, u32 value),
TP_ARGS(local, value),
TP_STRUCT__entry(
LOCAL_ENTRY
__field(u32, value)
),
TP_fast_assign(
LOCAL_ASSIGN;
__entry->value = value;
),
TP_printk(
LOCAL_PR_FMT " value:%d",
LOCAL_PR_ARG, __entry->value
)
);
TRACE_EVENT(drv_set_rts_threshold,
TP_PROTO(struct ieee80211_local *local, u32 value),
......
......@@ -1033,6 +1033,7 @@ static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
struct ieee80211_radiotap_header *rthdr =
(struct ieee80211_radiotap_header *) skb->data;
struct ieee80211_supported_band *sband;
bool hw_frag;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
NULL);
......@@ -1042,6 +1043,9 @@ static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
tx->flags &= ~IEEE80211_TX_FRAGMENTED;
/* packet is fragmented in HW if we have a non-NULL driver callback */
hw_frag = (tx->local->ops->set_frag_threshold != NULL);
/*
* for every radiotap entry that is present
* (ieee80211_radiotap_iterator_next returns -ENOENT when no more
......@@ -1078,7 +1082,8 @@ static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
}
if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
if ((*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) &&
!hw_frag)
tx->flags |= IEEE80211_TX_FRAGMENTED;
break;
......@@ -1181,8 +1186,10 @@ ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
/*
* Set this flag (used below to indicate "automatic fragmentation"),
* it will be cleared/left by radiotap as desired.
* Only valid when fragmentation is done by the stack.
*/
tx->flags |= IEEE80211_TX_FRAGMENTED;
if (!local->ops->set_frag_threshold)
tx->flags |= IEEE80211_TX_FRAGMENTED;
/* process and remove the injection radiotap header */
if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) {
......
......@@ -1152,6 +1152,9 @@ int ieee80211_reconfig(struct ieee80211_local *local)
}
mutex_unlock(&local->sta_mtx);
/* setup fragmentation threshold */
drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
/* setup RTS threshold */
drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
......
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