net: stmmac: Send TSO packets always from Queue 0

[ Upstream commit c5acdbee22a1b200dde07effd26fd1f649e9ab8a ]

The number of TSO enabled channels in HW can be different than the
number of total channels. There is no way to determined, at runtime, the
number of TSO capable channels and its safe to assume that if TSO is
enabled then at least channel 0 will be TSO capable.

Lets always send TSO packets from Queue 0.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Cc: Joao Pinto <jpinto@synopsys.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 5d83d6a7694b00cc11718659560b08af4c0a08b9..f76f6ae3fa87a357e5ffa94432da937491d95a1f 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3033,8 +3033,17 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
 
        /* Manage oversized TCP frames for GMAC4 device */
        if (skb_is_gso(skb) && priv->tso) {
-               if (skb_shinfo(skb)->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))
+               if (skb_shinfo(skb)->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)) {
+                       /*
+                        * There is no way to determine the number of TSO
+                        * capable Queues. Let's use always the Queue 0
+                        * because if TSO is supported then at least this
+                        * one will be capable.
+                        */
+                       skb_set_queue_mapping(skb, 0);
+
                        return stmmac_tso_xmit(skb, dev);
+               }
        }
 
        if (unlikely(stmmac_tx_avail(priv, queue) < nfrags + 1)) {