rxrpc: Add a private skb flag to indicate transmission-phase skbs

    
Add a flag in the private data on an skbuff to indicate that this is a
transmission-phase buffer rather than a receive-phase buffer.
Signed-off-by: NDavid Howells <dhowells@redhat.com>

net/rxrpc/ar-internal.h

@@ -188,6 +188,7 @@ struct rxrpc_skb_priv {
 	u8		nr_subpackets;		/* Number of subpackets */
 	u8		rx_flags;		/* Received packet flags */
 #define RXRPC_SKB_INCL_LAST	0x01		/* - Includes last packet */
+#define RXRPC_SKB_TX_BUFFER	0x02		/* - Is transmit buffer */
 	union {
 		int		remain;		/* amount of space remaining for next write */
 

net/rxrpc/sendmsg.c

@@ -336,6 +336,8 @@ static int rxrpc_send_data(struct rxrpc_sock *rx,
 			if (!skb)
 				goto maybe_error;
 
+			sp = rxrpc_skb(skb);
+			sp->rx_flags |= RXRPC_SKB_TX_BUFFER;
 			rxrpc_new_skb(skb, rxrpc_skb_tx_new);
 
 			_debug("ALLOC SEND %p", skb);
@@ -346,7 +348,6 @@ static int rxrpc_send_data(struct rxrpc_sock *rx,
 			skb_reserve(skb, call->conn->security_size);
 			skb->len += call->conn->security_size;
 
-			sp = rxrpc_skb(skb);
 			sp->remain = chunk;
 			if (sp->remain > skb_tailroom(skb))
 				sp->remain = skb_tailroom(skb);