linux-kernel - [PATCH net 10/19] net/sonic: Start packet transmission immediately

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Message-Id: <031786f4029e93b7df05fddaed34e1faf4c89ad7.1579474569.git.fthain@telegraphics.com.au>
Date:   Mon, 20 Jan 2020 09:56:09 +1100
From:   Finn Thain <fthain@...egraphics.com.au>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Chris Zankel <chris@...kel.net>,
        Laurent Vivier <laurent@...ier.eu>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH net 10/19] net/sonic: Start packet transmission immediately

Give the transmit command as soon as the transmit descriptor is ready.

Tested-by: Stan Johnson <userm57@...oo.com>
Signed-off-by: Finn Thain <fthain@...egraphics.com.au>
---
 drivers/net/ethernet/natsemi/sonic.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/natsemi/sonic.c b/drivers/net/ethernet/natsemi/sonic.c
index 6322b4543e0b..6660bd75b699 100644
--- a/drivers/net/ethernet/natsemi/sonic.c
+++ b/drivers/net/ethernet/natsemi/sonic.c
@@ -287,12 +287,15 @@ static int sonic_send_packet(struct sk_buff *skb, struct net_device *dev)
 	sonic_tda_put(dev, entry, SONIC_TD_LINK,
 		sonic_tda_get(dev, entry, SONIC_TD_LINK) | SONIC_EOL);
 
+	sonic_tda_put(dev, lp->eol_tx, SONIC_TD_LINK, ~SONIC_EOL &
+		      sonic_tda_get(dev, lp->eol_tx, SONIC_TD_LINK));
+
+	SONIC_WRITE(SONIC_CMD, SONIC_CR_TXP);
+
 	lp->tx_len[entry] = length;
 	lp->tx_laddr[entry] = laddr;
 	lp->tx_skb[entry] = skb;
 
-	sonic_tda_put(dev, lp->eol_tx, SONIC_TD_LINK,
-				  sonic_tda_get(dev, lp->eol_tx, SONIC_TD_LINK) & ~SONIC_EOL);
 	lp->eol_tx = entry;
 
 	entry = (entry + 1) & SONIC_TDS_MASK;
@@ -305,8 +308,6 @@ static int sonic_send_packet(struct sk_buff *skb, struct net_device *dev)
 
 	netif_dbg(lp, tx_queued, dev, "%s: issuing Tx command\n", __func__);
 
-	SONIC_WRITE(SONIC_CMD, SONIC_CR_TXP);
-
 	local_irq_restore(flags);
 
 	return NETDEV_TX_OK;
-- 
2.24.1