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commit 8b7a7048220f86547db31de0abe1ea6dd2cfa892
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Author: David Woodhouse <dwmw2@infradead.org>
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Date: Thu Sep 24 11:38:22 2015 +0100
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8139cp: Fix GSO MSS handling
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When fixing the TSO support I noticed we just mask ->gso_size with the
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MSSMask value and don't care about the consequences.
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Provide a .ndo_features_check() method which drops the NETIF_F_TSO
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feature for any skb which would exceed the maximum, and thus forces it
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to be segmented by software.
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Then we can stop the masking in cp_start_xmit(), and just WARN if the
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maximum is exceeded, which should now never happen.
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Finally, Francois Romieu noticed that we didn't even have the right
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value for MSSMask anyway; it should be 0x7ff (11 bits) not 0xfff.
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Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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commit 5a58f227790faded5a3ef6075f3ddd65093e0f86
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Author: David Woodhouse <David.Woodhouse@intel.com>
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Date: Wed Sep 23 09:46:09 2015 +0100
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8139cp: Enable offload features by default
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I fixed TSO. Hardware checksum and scatter/gather also appear to be
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working correctly both on real hardware and in QEMU's emulation.
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Let's enable them by default and see if anyone screams...
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Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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--- a/drivers/net/ethernet/realtek/8139cp.c
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+++ b/drivers/net/ethernet/realtek/8139cp.c
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@@ -175,7 +175,7 @@ enum {
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LastFrag = (1 << 28), /* Final segment of a packet */
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LargeSend = (1 << 27), /* TCP Large Send Offload (TSO) */
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MSSShift = 16, /* MSS value position */
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- MSSMask = 0xfff, /* MSS value: 11 bits */
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+ MSSMask = 0x7ff, /* MSS value: 11 bits */
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TxError = (1 << 23), /* Tx error summary */
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RxError = (1 << 20), /* Rx error summary */
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IPCS = (1 << 18), /* Calculate IP checksum */
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@@ -754,10 +754,16 @@ static netdev_tx_t cp_start_xmit (struct
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eor = (entry == (CP_TX_RING_SIZE - 1)) ? RingEnd : 0;
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mss = skb_shinfo(skb)->gso_size;
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+ if (mss > MSSMask) {
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+ WARN_ONCE(1, "Net bug: GSO size %d too large for 8139CP\n",
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+ mss);
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+ goto out_dma_error;
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+ }
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+
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opts2 = cpu_to_le32(cp_tx_vlan_tag(skb));
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opts1 = DescOwn;
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if (mss)
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- opts1 |= LargeSend | ((mss & MSSMask) << MSSShift);
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+ opts1 |= LargeSend | (mss << MSSShift);
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else if (skb->ip_summed == CHECKSUM_PARTIAL) {
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const struct iphdr *ip = ip_hdr(skb);
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if (ip->protocol == IPPROTO_TCP)
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@@ -1852,6 +1858,15 @@ static void cp_set_d3_state (struct cp_p
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pci_set_power_state (cp->pdev, PCI_D3hot);
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}
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+static netdev_features_t cp_features_check(struct sk_buff *skb,
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+ struct net_device *dev,
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+ netdev_features_t features)
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+{
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+ if (skb_shinfo(skb)->gso_size > MSSMask)
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+ features &= ~NETIF_F_TSO;
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+
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+ return vlan_features_check(skb, features);
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+}
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static const struct net_device_ops cp_netdev_ops = {
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.ndo_open = cp_open,
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.ndo_stop = cp_close,
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@@ -1864,6 +1879,7 @@ static const struct net_device_ops cp_ne
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.ndo_tx_timeout = cp_tx_timeout,
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.ndo_set_features = cp_set_features,
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.ndo_change_mtu = cp_change_mtu,
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+ .ndo_features_check = cp_features_check,
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#ifdef CONFIG_NET_POLL_CONTROLLER
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.ndo_poll_controller = cp_poll_controller,
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@@ -1983,12 +1999,12 @@ static int cp_init_one (struct pci_dev *
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dev->ethtool_ops = &cp_ethtool_ops;
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dev->watchdog_timeo = TX_TIMEOUT;
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- dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
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+ dev->features |= NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO |
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+ NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
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if (pci_using_dac)
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dev->features |= NETIF_F_HIGHDMA;
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- /* disabled by default until verified */
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dev->hw_features |= NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO |
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NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
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dev->vlan_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO |
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