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From: David Howells <dhowells@redhat.com>
To: netdev@vger.kernel.org
Cc: dhowells@redhat.com, linux-afs@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH net 1/6] rxrpc: Abstract out the calculation of whether there's Tx space
Date: Thu, 19 Mar 2020 11:53:36 +0000	[thread overview]
Message-ID: <158461881648.3094720.6613599061371004433.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <158461880968.3094720.5019510060910604912.stgit@warthog.procyon.org.uk>

Abstract out the calculation of there being sufficient Tx buffer space.
This is reproduced several times in the rxrpc sendmsg code.

Signed-off-by: David Howells <dhowells@redhat.com>
---

 net/rxrpc/sendmsg.c |   27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c
index 813fd6888142..a13051d38097 100644
--- a/net/rxrpc/sendmsg.c
+++ b/net/rxrpc/sendmsg.c
@@ -17,6 +17,21 @@
 #include <net/af_rxrpc.h>
 #include "ar-internal.h"
 
+/*
+ * Return true if there's sufficient Tx queue space.
+ */
+static bool rxrpc_check_tx_space(struct rxrpc_call *call, rxrpc_seq_t *_tx_win)
+{
+	unsigned int win_size =
+		min_t(unsigned int, call->tx_winsize,
+		      call->cong_cwnd + call->cong_extra);
+	rxrpc_seq_t tx_win = READ_ONCE(call->tx_hard_ack);
+
+	if (_tx_win)
+		*_tx_win = tx_win;
+	return call->tx_top - tx_win < win_size;
+}
+
 /*
  * Wait for space to appear in the Tx queue or a signal to occur.
  */
@@ -26,9 +41,7 @@ static int rxrpc_wait_for_tx_window_intr(struct rxrpc_sock *rx,
 {
 	for (;;) {
 		set_current_state(TASK_INTERRUPTIBLE);
-		if (call->tx_top - call->tx_hard_ack <
-		    min_t(unsigned int, call->tx_winsize,
-			  call->cong_cwnd + call->cong_extra))
+		if (rxrpc_check_tx_space(call, NULL))
 			return 0;
 
 		if (call->state >= RXRPC_CALL_COMPLETE)
@@ -68,9 +81,7 @@ static int rxrpc_wait_for_tx_window_nonintr(struct rxrpc_sock *rx,
 		set_current_state(TASK_UNINTERRUPTIBLE);
 
 		tx_win = READ_ONCE(call->tx_hard_ack);
-		if (call->tx_top - tx_win <
-		    min_t(unsigned int, call->tx_winsize,
-			  call->cong_cwnd + call->cong_extra))
+		if (rxrpc_check_tx_space(call, &tx_win))
 			return 0;
 
 		if (call->state >= RXRPC_CALL_COMPLETE)
@@ -302,9 +313,7 @@ static int rxrpc_send_data(struct rxrpc_sock *rx,
 
 			_debug("alloc");
 
-			if (call->tx_top - call->tx_hard_ack >=
-			    min_t(unsigned int, call->tx_winsize,
-				  call->cong_cwnd + call->cong_extra)) {
+			if (!rxrpc_check_tx_space(call, NULL)) {
 				ret = -EAGAIN;
 				if (msg->msg_flags & MSG_DONTWAIT)
 					goto maybe_error;



  reply	other threads:[~2020-03-19 11:53 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-19 11:53 [PATCH net 0/6] rxrpc, afs: Interruptibility fixes David Howells
2020-03-19 11:53 ` David Howells [this message]
2020-03-19 11:53 ` [PATCH net 2/6] rxrpc: Fix call interruptibility handling David Howells
2020-03-19 11:53 ` [PATCH net 3/6] rxrpc: Fix sendmsg(MSG_WAITALL) handling David Howells
2020-03-19 11:53 ` [PATCH net 4/6] afs: Fix some tracing details David Howells
2020-03-19 11:54 ` [PATCH net 5/6] afs: Fix handling of an abort from a service handler David Howells
2020-03-19 11:54 ` [PATCH net 6/6] afs: Fix client call Rx-phase signal handling David Howells
2020-03-20  3:28 ` [PATCH net 0/6] rxrpc, afs: Interruptibility fixes David Miller

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