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From: Aleksander Morgado <aleksander@aleksander.es>
To: s.hauer@pengutronix.de, barebox@lists.infradead.org
Cc: Aleksander Morgado <aleksander@aleksander.es>
Subject: [PATCH 10/16] ratp: fix sending ACKs without data
Date: Thu, 15 Jun 2017 13:14:14 +0200	[thread overview]
Message-ID: <20170615111420.5318-11-aleksander@aleksander.es> (raw)
In-Reply-To: <20170615111420.5318-1-aleksander@aleksander.es>

All ACKs without data must be built in the same way from the input
message:
     <SN=received AN><AN=received SN+1 modulo 2><CTL=ACK>

The code was actually doing this instead:
     <SN=0><AN=SN><CTL=ACK>

Signed-off-by: Aleksander Morgado <aleksander@aleksander.es>
---
 lib/ratp.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/lib/ratp.c b/lib/ratp.c
index 321721ab7..5c52d3b5f 100644
--- a/lib/ratp.c
+++ b/lib/ratp.c
@@ -364,13 +364,12 @@ static bool ratp_sn_expected(struct ratp_internal *ri, struct ratp_header *hdr)
 
 static int ratp_send_ack(struct ratp_internal *ri, struct ratp_header *hdr)
 {
-	uint8_t control = RATP_CONTROL_ACK;
+	uint8_t control;
 	int ret;
 
-	if (hdr->control & RATP_CONTROL_SN)
-		control |= RATP_CONTROL_AN;
-	else
-		control |= 0;
+	control = ratp_set_sn(ratp_an(hdr)) |
+		ratp_set_an(ratp_sn(hdr) + 1) |
+		RATP_CONTROL_ACK;
 
 	ret = ratp_send_hdr(ri, control);
 	if (ret)
-- 
2.13.1


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  parent reply	other threads:[~2017-06-15 11:15 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-15 11:14 [PATCH 00/16] RATP logic fixes and improvements Aleksander Morgado
2017-06-15 11:14 ` [PATCH 01/16] ratp: add missing transition to SYN-RECEIVED in behavior B Aleksander Morgado
2017-06-15 11:14 ` [PATCH 02/16] ratp: avoid unnecessary variable initializations Aleksander Morgado
2017-06-15 11:14 ` [PATCH 03/16] ratp: send missing RST in behavior C2 Aleksander Morgado
2017-06-15 11:14 ` [PATCH 04/16] ratp: add missing RST flag in behavior G Aleksander Morgado
2017-06-15 11:14 ` [PATCH 05/16] ratp: completely ignore RST flagged packets " Aleksander Morgado
2017-06-15 11:14 ` [PATCH 06/16] ratp: fix data presence check Aleksander Morgado
2017-06-15 11:14 ` [PATCH 07/16] ratp: fix single byte sending flagged with SO Aleksander Morgado
2017-06-15 11:14 ` [PATCH 08/16] ratp: remove bogus data checks in behavior C2 Aleksander Morgado
2017-06-15 11:14 ` [PATCH 09/16] ratp: remove FIXME comment: FIN always requires ACK Aleksander Morgado
2017-06-15 11:14 ` Aleksander Morgado [this message]
2017-06-15 11:14 ` [PATCH 11/16] ratp: consolidate ratp_sn_expected() and ratp_an_expected() Aleksander Morgado
2017-06-15 11:14 ` [PATCH 12/16] ratp: prefer using ratp_send_ack() in behaviour I1 Aleksander Morgado
2017-06-15 11:14 ` [PATCH 13/16] ratp: send initial data in behaviour B if any pending Aleksander Morgado
2017-06-15 11:14 ` [PATCH 14/16] ratp: don't ignore data that may arrive in behaviour H1 Aleksander Morgado
2017-06-15 11:14 ` [PATCH 15/16] ratp: consolidate setting the next AN or SN flags Aleksander Morgado
2017-06-15 11:14 ` [PATCH 16/16] ratp: user close may happen in SYN-RECEIVED state Aleksander Morgado
2017-06-19  6:46 ` [PATCH 00/16] RATP logic fixes and improvements Sascha Hauer
2017-06-19  9:07   ` Aleksander Morgado
2017-06-19  9:37     ` Sascha Hauer

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