101  * Handle an MTU/fragmentation problem.
103 static void rxrpc_adjust_mtu(struct rxrpc_peer *peer, unsigned int mtu)  in rxrpc_adjust_mtu()  argument
105 	/* wind down the local interface MTU */  in rxrpc_adjust_mtu()
106 	if (mtu > 0 && peer->if_mtu == 65535 && mtu < peer->if_mtu)  in rxrpc_adjust_mtu()
107 		peer->if_mtu = mtu;  in rxrpc_adjust_mtu()
109 	if (mtu == 0) {  in rxrpc_adjust_mtu()
111 		mtu = peer->if_mtu;  in rxrpc_adjust_mtu()
112 		if (mtu > 1500) {  in rxrpc_adjust_mtu()
113 			mtu >>= 1;  in rxrpc_adjust_mtu()
114 			if (mtu < 1500)  in rxrpc_adjust_mtu()
115 				mtu = 1500;  in rxrpc_adjust_mtu()
117 			mtu -= 100;  in rxrpc_adjust_mtu()
118 			if (mtu < peer->hdrsize)  in rxrpc_adjust_mtu()
119 				mtu = peer->hdrsize + 4;  in rxrpc_adjust_mtu()
123 	if (mtu < peer->mtu) {  in rxrpc_adjust_mtu()
125 		peer->mtu = mtu;  in rxrpc_adjust_mtu()
126 		peer->maxdata = peer->mtu - peer->hdrsize;  in rxrpc_adjust_mtu()