Phonet: zero-copy GPRS TX

Send aligned pipe payload if requested to do so. Then, the socket buffer
needs not be fragmented anymore.

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/phonet/pep.h b/include/net/phonet/pep.h
index c371625..35672b1 100644
--- a/include/net/phonet/pep.h
+++ b/include/net/phonet/pep.h
@@ -44,6 +44,7 @@
 	u8			rx_fc;	/* RX flow control */
 	u8			tx_fc;	/* TX flow control */
 	u8			init_enable;	/* auto-enable at creation */
+	u8			aligned;
 };
 
 static inline struct pep_sock *pep_sk(struct sock *sk)
@@ -139,6 +140,7 @@
 	PN_PIPE_SB_NEGOTIATED_FC,
 	PN_PIPE_SB_REQUIRED_FC_TX,
 	PN_PIPE_SB_PREFERRED_FC_RX,
+	PN_PIPE_SB_ALIGNED_DATA,
 };
 
 /* Phonet pipe flow control models */