net: stmmac: Re-work the queue selection for TSO packets

Ben Hutchings says:
	"This is the wrong place to change the queue mapping.
	stmmac_xmit() is called with a specific TX queue locked,
	and accessing a different TX queue results in a data race
	for all of that queue's state.

	I think this commit should be reverted upstream and in all
	stable branches.  Instead, the driver should implement the
	ndo_select_queue operation and override the queue mapping there."

Fixes: c5acdbee22a1 ("net: stmmac: Send TSO packets always from Queue 0")
Suggested-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 06358fe..11b6feb 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3045,17 +3045,8 @@ 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)) {
-                       /*
-                        * 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);
-
+               if (skb_shinfo(skb)->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))
                        return stmmac_tso_xmit(skb, dev);
-               }
        }
 
        if (unlikely(stmmac_tx_avail(priv, queue) < nfrags + 1)) {
@@ -3872,6 +3863,22 @@ static int stmmac_setup_tc(struct net_device *ndev, enum tc_setup_type type,
        }
 }
 
+static u16 stmmac_select_queue(struct net_device *dev, struct sk_buff *skb,
+                              struct net_device *sb_dev)
+{
+       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.
+                */
+               return 0;
+       }
+
+       return netdev_pick_tx(dev, skb, NULL) % dev->real_num_tx_queues;
+}
+
 static int stmmac_set_mac_address(struct net_device *ndev, void *addr)
 {
        struct stmmac_priv *priv = netdev_priv(ndev);
@@ -4088,6 +4095,7 @@ static const struct net_device_ops stmmac_netdev_ops = {
        .ndo_tx_timeout = stmmac_tx_timeout,
        .ndo_do_ioctl = stmmac_ioctl,
        .ndo_setup_tc = stmmac_setup_tc,
+       .ndo_select_queue = stmmac_select_queue,
 #ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller = stmmac_poll_controller,
 #endif