linux-kernel - [PATCH 5.11 548/601] net: stmmac: fix TSO and TBS feature enabling during driver open

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Date:   Wed, 12 May 2021 16:50:25 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ong Boon Leong <boon.leong.ong@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.11 548/601] net: stmmac: fix TSO and TBS feature enabling during driver open

From: Ong Boon Leong <boon.leong.ong@...el.com>

[ Upstream commit 5e6038b88a5718910dd74b949946d9d9cee9a041 ]

TSO and TBS cannot co-exist and current implementation requires two
fixes:

 1) stmmac_open() does not need to call stmmac_enable_tbs() because
    the MAC is reset in stmmac_init_dma_engine() anyway.
 2) Inside stmmac_hw_setup(), we should call stmmac_enable_tso() for
    TX Q that is _not_ configured for TBS.

Fixes: 579a25a854d4 ("net: stmmac: Initial support for TBS")
Signed-off-by: Ong Boon Leong <boon.leong.ong@...el.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 4749bd0af160..c6f24abf6432 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -2757,8 +2757,15 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
 
 	/* Enable TSO */
 	if (priv->tso) {
-		for (chan = 0; chan < tx_cnt; chan++)
+		for (chan = 0; chan < tx_cnt; chan++) {
+			struct stmmac_tx_queue *tx_q = &priv->tx_queue[chan];
+
+			/* TSO and TBS cannot co-exist */
+			if (tx_q->tbs & STMMAC_TBS_AVAIL)
+				continue;
+
 			stmmac_enable_tso(priv, priv->ioaddr, 1, chan);
+		}
 	}
 
 	/* Enable Split Header */
@@ -2850,9 +2857,8 @@ static int stmmac_open(struct net_device *dev)
 		struct stmmac_tx_queue *tx_q = &priv->tx_queue[chan];
 		int tbs_en = priv->plat->tx_queues_cfg[chan].tbs_en;
 
+		/* Setup per-TXQ tbs flag before TX descriptor alloc */
 		tx_q->tbs |= tbs_en ? STMMAC_TBS_AVAIL : 0;
-		if (stmmac_enable_tbs(priv, priv->ioaddr, tbs_en, chan))
-			tx_q->tbs &= ~STMMAC_TBS_AVAIL;
 	}
 
 	ret = alloc_dma_desc_resources(priv);
-- 
2.30.2