netdev - [PATCH net 5/7] rxrpc: Add a private skb flag to indicate transmission-phase skbs

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Date:   Thu, 29 Aug 2019 14:08:08 +0100
From:   David Howells <dhowells@...hat.com>
To:     netdev@...r.kernel.org
Cc:     dhowells@...hat.com, linux-afs@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH net 5/7] 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: David Howells <dhowells@...hat.com>
---

 net/rxrpc/ar-internal.h |    1 +
 net/rxrpc/sendmsg.c     |    3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index 20d7907a5bc6..63d3a91ce5e9 100644
--- a/net/rxrpc/ar-internal.h
+++ b/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 */
 
diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c
index bae14438f869..472dc3b7d91f 100644
--- a/net/rxrpc/sendmsg.c
+++ b/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);