[PATCH] mac80211: Store max_mtu in ieee80211_hw

[Wen Gong <wgong@xxxxxxxxxxxxxx>]

Make it possibly for drivers to adjust the default mat_mtu
by storing it in the hardware struct.

Signed-off-by: Wen Gong <wgong@xxxxxxxxxxxxxx>
---
 include/net/mac80211.h | 3 +++
 net/mac80211/iface.c   | 5 ++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index d26da01..8545b03 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -2454,6 +2454,8 @@ enum ieee80211_hw_flags {
  *
  * @weight_multiplier: Driver specific airtime weight multiplier used while
  *	refilling deficit of each TXQ.
+ *
+ * @max_mtu: the max mtu could be set.
  */
 struct ieee80211_hw {
 	struct ieee80211_conf conf;
@@ -2491,6 +2493,7 @@ struct ieee80211_hw {
 	u8 max_nan_de_entries;
 	u8 tx_sk_pacing_shift;
 	u8 weight_multiplier;
+	u32 max_mtu;
 };
 
 static inline bool _ieee80211_hw_check(struct ieee80211_hw *hw,
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 06aac0a..00c33e6 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -1877,7 +1877,10 @@ int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 
 		/* MTU range: 256 - 2304 */
 		ndev->min_mtu = 256;
-		ndev->max_mtu = IEEE80211_MAX_DATA_LEN;
+		if (local->hw.max_mtu)
+			ndev->max_mtu = local->hw.max_mtu;
+		else
+			ndev->max_mtu = IEEE80211_MAX_DATA_LEN;
 
 		ret = register_netdevice(ndev);
 		if (ret) {
-- 
1.9.1