linux-kernel - [PATCH net-next 03/13] rxrpc: Remove handling of duplicate packets in recvmsg

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Message-ID: <166919800599.1256245.15876799628241612501.stgit@warthog.procyon.org.uk>
Date:   Wed, 23 Nov 2022 10:06:46 +0000
From:   David Howells <dhowells@...hat.com>
To:     netdev@...r.kernel.org
Cc:     Marc Dionne <marc.dionne@...istor.com>,
        linux-afs@...ts.infradead.org, dhowells@...hat.com,
        linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 03/13] rxrpc: Remove handling of duplicate packets in
 recvmsg_queue

We should not now see duplicate packets in the recvmsg_queue.  At one
point, jumbo packets that overlapped with already queued data would be
added to the queue and dealt with in recvmsg rather than in the softirq
input code, but now jumbo packets are split/cloned before being processed
by the input code and the subpackets can be discarded individually.

So remove the recvmsg-side code for handling this.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Marc Dionne <marc.dionne@...istor.com>
cc: linux-afs@...ts.infradead.org
---

 net/rxrpc/recvmsg.c |   18 ------------------
 1 file changed, 18 deletions(-)

diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c
index efb85f983657..134122f5961a 100644
--- a/net/rxrpc/recvmsg.c
+++ b/net/rxrpc/recvmsg.c
@@ -228,7 +228,6 @@ static void rxrpc_rotate_rx_window(struct rxrpc_call *call)
 
 	_enter("%d", call->debug_id);
 
-further_rotation:
 	skb = skb_dequeue(&call->recvmsg_queue);
 	rxrpc_see_skb(skb, rxrpc_skb_rotated);
 
@@ -250,17 +249,6 @@ static void rxrpc_rotate_rx_window(struct rxrpc_call *call)
 		return;
 	}
 
-	/* The next packet on the queue might entirely overlap with the one we
-	 * just consumed; if so, rotate that away also.
-	 */
-	skb = skb_peek(&call->recvmsg_queue);
-	if (skb) {
-		sp = rxrpc_skb(skb);
-		if (sp->hdr.seq != call->rx_consumed &&
-		    after_eq(call->rx_consumed, sp->hdr.seq))
-			goto further_rotation;
-	}
-
 	/* Check to see if there's an ACK that needs sending. */
 	acked = atomic_add_return(call->rx_consumed - old_consumed,
 				  &call->ackr_nr_consumed);
@@ -318,11 +306,6 @@ static int rxrpc_recvmsg_data(struct socket *sock, struct rxrpc_call *call,
 		sp = rxrpc_skb(skb);
 		seq = sp->hdr.seq;
 
-		if (after_eq(call->rx_consumed, seq)) {
-			kdebug("obsolete %x %x", call->rx_consumed, seq);
-			goto skip_obsolete;
-		}
-
 		if (!(flags & MSG_PEEK))
 			trace_rxrpc_receive(call, rxrpc_receive_front,
 					    sp->hdr.serial, seq);
@@ -373,7 +356,6 @@ static int rxrpc_recvmsg_data(struct socket *sock, struct rxrpc_call *call,
 			break;
 		}
 
-	skip_obsolete:
 		/* The whole packet has been transferred. */
 		if (sp->hdr.flags & RXRPC_LAST_PACKET)
 			ret = 1;