net: stmmac: convert to hw_features

This also removes TSO as it's made fully in software --- better to leave this
to networking core.

If the MAC features can be detected at probe time and not at open, then
stmmac_fix_features could be simplified by limiting hw_features. That's
also better for users as they don't see offloads being togglable but
never turned on.

Redundant fallbacks for TX csum are removed as it's already handled
by network core.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 23 insertions, 60 deletions

diff --git a/drivers/net/stmmac/stmmac_main.c b/drivers/net/stmmac/stmmac_main.c
index 0e5f03135b50..62fa51ed93ff 100644
--- a/drivers/net/stmmac/stmmac_main.c
+++ b/drivers/net/stmmac/stmmac_main.c
@@ -139,7 +139,6 @@ static const u32 default_msg_level = (NETIF_MSG_DRV | NETIF_MSG_PROBE |
                                       NETIF_MSG_IFDOWN | NETIF_MSG_TIMER);
 
 static irqreturn_t stmmac_interrupt(int irq, void *dev_id);
-static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev);
 
 /**
  * stmmac_verify_args - verify the driver parameters.
@@ -843,6 +842,7 @@ static int stmmac_open(struct net_device *dev)
                 pr_info("stmmac: Rx Checksum Offload Engine supported\n");
         if (priv->plat->tx_coe)
                 pr_info("\tTX Checksum insertion supported\n");
+        netdev_update_features(dev);
 
         /* Initialise the MMC (if present) to disable all interrupts. */
         writel(0xffffffff, priv->ioaddr + MMC_HIGH_INTR_MASK);
@@ -927,46 +927,6 @@ static int stmmac_release(struct net_device *dev)
         return 0;
 }
 
-/*
- * To perform emulated hardware segmentation on skb.
- */
-static int stmmac_sw_tso(struct stmmac_priv *priv, struct sk_buff *skb)
-{
-        struct sk_buff *segs, *curr_skb;
-        int gso_segs = skb_shinfo(skb)->gso_segs;
-
-        /* Estimate the number of fragments in the worst case */
-        if (unlikely(stmmac_tx_avail(priv) < gso_segs)) {
-                netif_stop_queue(priv->dev);
-                TX_DBG(KERN_ERR "%s: TSO BUG! Tx Ring full when queue awake\n",
-                       __func__);
-                if (stmmac_tx_avail(priv) < gso_segs)
-                        return NETDEV_TX_BUSY;
-
-                netif_wake_queue(priv->dev);
-        }
-        TX_DBG("\tstmmac_sw_tso: segmenting: skb %p (len %d)\n",
-               skb, skb->len);
-
-        segs = skb_gso_segment(skb, priv->dev->features & ~NETIF_F_TSO);
-        if (IS_ERR(segs))
-                goto sw_tso_end;
-
-        do {
-                curr_skb = segs;
-                segs = segs->next;
-                TX_DBG("\t\tcurrent skb->len: %d, *curr %p,"
-                       "*next %p\n", curr_skb->len, curr_skb, segs);
-                curr_skb->next = NULL;
-                stmmac_xmit(curr_skb, priv->dev);
-        } while (segs);
-
-sw_tso_end:
-        dev_kfree_skb(skb);
-
-        return NETDEV_TX_OK;
-}
-
 static unsigned int stmmac_handle_jumbo_frames(struct sk_buff *skb,
                                                struct net_device *dev,
                                                int csum_insertion)
@@ -1044,16 +1004,7 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
                        !skb_is_gso(skb) ? "isn't" : "is");
 #endif
 
-        if (unlikely(skb_is_gso(skb)))
-                return stmmac_sw_tso(priv, skb);
-
-        if (likely((skb->ip_summed == CHECKSUM_PARTIAL))) {
-                if (unlikely((!priv->plat->tx_coe) ||
-                             (priv->no_csum_insertion)))
-                        skb_checksum_help(skb);
-                else
-                        csum_insertion = 1;
-        }
+        csum_insertion = (skb->ip_summed == CHECKSUM_PARTIAL);
 
         desc = priv->dma_tx + entry;
         first = desc;
@@ -1373,18 +1324,29 @@ static int stmmac_change_mtu(struct net_device *dev, int new_mtu)
                 return -EINVAL;
         }
 
+        dev->mtu = new_mtu;
+        netdev_update_features(dev);
+
+        return 0;
+}
+
+static u32 stmmac_fix_features(struct net_device *dev, u32 features)
+{
+        struct stmmac_priv *priv = netdev_priv(dev);
+
+        if (!priv->rx_coe)
+                features &= ~NETIF_F_RXCSUM;
+        if (!priv->plat->tx_coe)
+                features &= ~NETIF_F_ALL_CSUM;
+
         /* Some GMAC devices have a bugged Jumbo frame support that
          * needs to have the Tx COE disabled for oversized frames
          * (due to limited buffer sizes). In this case we disable
          * the TX csum insertionin the TDES and not use SF. */
-        if ((priv->plat->bugged_jumbo) && (priv->dev->mtu > ETH_DATA_LEN))
-                priv->no_csum_insertion = 1;
-        else
-                priv->no_csum_insertion = 0;
+        if (priv->plat->bugged_jumbo && (dev->mtu > ETH_DATA_LEN))
+                features &= ~NETIF_F_ALL_CSUM;
 
-        dev->mtu = new_mtu;
-
-        return 0;
+        return features;
 }
 
 static irqreturn_t stmmac_interrupt(int irq, void *dev_id)
@@ -1464,6 +1426,7 @@ static const struct net_device_ops stmmac_netdev_ops = {
         .ndo_start_xmit = stmmac_xmit,
         .ndo_stop = stmmac_release,
         .ndo_change_mtu = stmmac_change_mtu,
+        .ndo_fix_features = stmmac_fix_features,
         .ndo_set_multicast_list = stmmac_multicast_list,
         .ndo_tx_timeout = stmmac_tx_timeout,
         .ndo_do_ioctl = stmmac_ioctl,
@@ -1494,8 +1457,8 @@ static int stmmac_probe(struct net_device *dev)
         dev->netdev_ops = &stmmac_netdev_ops;
         stmmac_set_ethtool_ops(dev);
 
-        dev->features |= NETIF_F_SG | NETIF_F_HIGHDMA |
-                NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
+        dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
+        dev->features |= dev->hw_features | NETIF_F_HIGHDMA;
         dev->watchdog_timeo = msecs_to_jiffies(watchdog);
 #ifdef STMMAC_VLAN_TAG_USED
         /* Both mac100 and gmac support receive VLAN tag detection */