linux-kernel - [PATCH net-next 4/5] net: ipa: call gsi_evt_ring_rx

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Message-Id: <20220615165929.5924-5-elder@linaro.org>
Date:   Wed, 15 Jun 2022 11:59:28 -0500
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Cc:     mka@...omium.org, evgreen@...omium.org, bjorn.andersson@...aro.org,
        quic_cpratapa@...cinc.com, quic_avuyyuru@...cinc.com,
        quic_jponduru@...cinc.com, quic_subashab@...cinc.com,
        elder@...nel.org, netdev@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 4/5] net: ipa: call gsi_evt_ring_rx_update() unconditionally

When an RX transaction completes, we update the trans->len field to
contain the actual number of bytes received.  This is done in a loop
in gsi_evt_ring_rx_update().

Change that function so it checks the data transfer direction
recorded in the transaction, and only updates trans->len for RX
transfers.

Then call it unconditionally.  This means events for TX endpoints
will run through the loop without otherwise doing anything, but
this will change shortly.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/gsi.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
index 2c531ba1af2eb..d08f3e73d51fc 100644
--- a/drivers/net/ipa/gsi.c
+++ b/drivers/net/ipa/gsi.c
@@ -1392,7 +1392,8 @@ static void gsi_evt_ring_rx_update(struct gsi *gsi, u32 evt_ring_id, u32 index)
 		if (!trans)
 			return;
 
-		trans->len = __le16_to_cpu(event->len);
+		if (trans->direction == DMA_FROM_DEVICE)
+			trans->len = __le16_to_cpu(event->len);
 
 		/* Move on to the next event and transaction */
 		if (--event_avail)
@@ -1500,8 +1501,7 @@ static struct gsi_trans *gsi_channel_update(struct gsi_channel *channel)
 	 */
 	if (channel->toward_ipa)
 		gsi_trans_tx_completed(trans);
-	else
-		gsi_evt_ring_rx_update(gsi, evt_ring_id, index);
+	gsi_evt_ring_rx_update(gsi, evt_ring_id, index);
 
 	gsi_trans_move_complete(trans);
 
-- 
2.34.1