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 0e66a5082140b61a32e77e5cbb3892daedff90da..b1454c63e675f493cb3e72e610206e96990f2248 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3019,8 +3019,17 @@ 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)) {