[Intel-wired-lan] [PATCH net-next 2/4] e1000e: Add ndo_enc_hdr_len
Toshiaki Makita
makita.toshiaki at lab.ntt.co.jp
Fri Oct 23 03:49:31 UTC 2015
e1000e has 4 bytes additional room for vlan header, so set default
enc_hdr_len to 4.
Note that e1000e uses mtu to validate frame size in some places, which
are needed to be modified to use max_frame_size as extra header room
became variable.
Signed-off-by: Toshiaki Makita <makita.toshiaki at lab.ntt.co.jp>
---
drivers/net/ethernet/intel/e1000e/netdev.c | 79 +++++++++++++++++++++---------
1 file changed, 57 insertions(+), 22 deletions(-)
diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 0a854a4..6a54f07 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -3046,7 +3046,7 @@ static void e1000_setup_rctl(struct e1000_adapter *adapter)
if (hw->mac.type >= e1000_pch2lan) {
s32 ret_val;
- if (adapter->netdev->mtu > ETH_DATA_LEN)
+ if (adapter->max_frame_size > VLAN_ETH_FRAME_LEN + ETH_FCS_LEN)
ret_val = e1000_lv_jumbo_workaround_ich8lan(hw, true);
else
ret_val = e1000_lv_jumbo_workaround_ich8lan(hw, false);
@@ -3066,7 +3066,7 @@ static void e1000_setup_rctl(struct e1000_adapter *adapter)
rctl &= ~E1000_RCTL_SBP;
/* Enable Long Packet receive */
- if (adapter->netdev->mtu <= ETH_DATA_LEN)
+ if (adapter->max_frame_size <= VLAN_ETH_FRAME_LEN + ETH_FCS_LEN)
rctl &= ~E1000_RCTL_LPE;
else
rctl |= E1000_RCTL_LPE;
@@ -3286,7 +3286,7 @@ static void e1000_configure_rx(struct e1000_adapter *adapter)
/* With jumbo frames, excessive C-state transition latencies result
* in dropped transactions.
*/
- if (adapter->netdev->mtu > ETH_DATA_LEN) {
+ if (adapter->max_frame_size > VLAN_ETH_FRAME_LEN + ETH_FCS_LEN) {
u32 lat =
((er32(PBA) & E1000_PBA_RXA_MASK) * 1024 -
adapter->max_frame_size) * 8 / 1000;
@@ -3978,7 +3978,7 @@ void e1000e_reset(struct e1000_adapter *adapter)
switch (hw->mac.type) {
case e1000_ich9lan:
case e1000_ich10lan:
- if (adapter->netdev->mtu > ETH_DATA_LEN) {
+ if (adapter->max_frame_size > VLAN_ETH_FRAME_LEN + ETH_FCS_LEN) {
pba = 14;
ew32(PBA, pba);
fc->high_water = 0x2800;
@@ -3997,7 +3997,7 @@ void e1000e_reset(struct e1000_adapter *adapter)
/* Workaround PCH LOM adapter hangs with certain network
* loads. If hangs persist, try disabling Tx flow control.
*/
- if (adapter->netdev->mtu > ETH_DATA_LEN) {
+ if (adapter->max_frame_size > VLAN_ETH_FRAME_LEN + ETH_FCS_LEN) {
fc->high_water = 0x3500;
fc->low_water = 0x1500;
} else {
@@ -4011,7 +4011,7 @@ void e1000e_reset(struct e1000_adapter *adapter)
case e1000_pch_spt:
fc->refresh_time = 0x0400;
- if (adapter->netdev->mtu <= ETH_DATA_LEN) {
+ if (adapter->max_frame_size <= VLAN_ETH_FRAME_LEN + ETH_FCS_LEN) {
fc->high_water = 0x05C20;
fc->low_water = 0x05048;
fc->pause_time = 0x0650;
@@ -4247,7 +4247,7 @@ void e1000e_down(struct e1000_adapter *adapter, bool reset)
/* Disable Si errata workaround on PCHx for jumbo frame flow */
if ((hw->mac.type >= e1000_pch2lan) &&
- (adapter->netdev->mtu > ETH_DATA_LEN) &&
+ (adapter->max_frame_size > VLAN_ETH_FRAME_LEN + ETH_FCS_LEN) &&
e1000_lv_jumbo_workaround_ich8lan(hw, false))
e_dbg("failed to disable jumbo frame workaround mode\n");
@@ -4346,7 +4346,8 @@ static int e1000_sw_init(struct e1000_adapter *adapter)
adapter->rx_buffer_len = VLAN_ETH_FRAME_LEN + ETH_FCS_LEN;
adapter->rx_ps_bsize0 = 128;
- adapter->max_frame_size = netdev->mtu + VLAN_ETH_HLEN + ETH_FCS_LEN;
+ adapter->max_frame_size = netdev->mtu + netdev->enc_hdr_len +
+ ETH_HLEN + ETH_FCS_LEN;
adapter->min_frame_size = ETH_ZLEN + ETH_FCS_LEN;
adapter->tx_ring_count = E1000_DEFAULT_TXD;
adapter->rx_ring_count = E1000_DEFAULT_RXD;
@@ -5920,17 +5921,10 @@ struct rtnl_link_stats64 *e1000e_get_stats64(struct net_device *netdev,
return stats;
}
-/**
- * e1000_change_mtu - Change the Maximum Transfer Unit
- * @netdev: network interface device structure
- * @new_mtu: new value for maximum frame size
- *
- * Returns 0 on success, negative on failure
- **/
-static int e1000_change_mtu(struct net_device *netdev, int new_mtu)
+static int e1000_change_max_frame(struct net_device *netdev, int max_frame,
+ int new_mtu)
{
struct e1000_adapter *adapter = netdev_priv(netdev);
- int max_frame = new_mtu + VLAN_ETH_HLEN + ETH_FCS_LEN;
/* Jumbo frame support */
if ((max_frame > (VLAN_ETH_FRAME_LEN + ETH_FCS_LEN)) &&
@@ -5940,7 +5934,7 @@ static int e1000_change_mtu(struct net_device *netdev, int new_mtu)
}
/* Supported frame sizes */
- if ((new_mtu < (VLAN_ETH_ZLEN + ETH_FCS_LEN)) ||
+ if ((new_mtu && new_mtu < (VLAN_ETH_ZLEN + ETH_FCS_LEN)) ||
(max_frame > adapter->max_hw_frame_size)) {
e_err("Unsupported MTU setting\n");
return -EINVAL;
@@ -5949,7 +5943,7 @@ static int e1000_change_mtu(struct net_device *netdev, int new_mtu)
/* Jumbo frame workaround on 82579 and newer requires CRC be stripped */
if ((adapter->hw.mac.type >= e1000_pch2lan) &&
!(adapter->flags2 & FLAG2_CRC_STRIPPING) &&
- (new_mtu > ETH_DATA_LEN)) {
+ (max_frame > VLAN_ETH_FRAME_LEN + ETH_FCS_LEN)) {
e_err("Jumbo Frames not supported on this device when CRC stripping is disabled.\n");
return -EINVAL;
}
@@ -5957,9 +5951,14 @@ static int e1000_change_mtu(struct net_device *netdev, int new_mtu)
while (test_and_set_bit(__E1000_RESETTING, &adapter->state))
usleep_range(1000, 2000);
/* e1000e_down -> e1000e_reset dependent on max_frame_size & mtu */
+ if (new_mtu) {
+ e_info("changing MTU from %d to %d\n", netdev->mtu, new_mtu);
+ netdev->mtu = new_mtu;
+ } else {
+ e_info("changing max frame size from %d to %d\n",
+ adapter->max_frame_size, max_frame);
+ }
adapter->max_frame_size = max_frame;
- e_info("changing MTU from %d to %d\n", netdev->mtu, new_mtu);
- netdev->mtu = new_mtu;
pm_runtime_get_sync(netdev->dev.parent);
@@ -5995,6 +5994,20 @@ static int e1000_change_mtu(struct net_device *netdev, int new_mtu)
return 0;
}
+/**
+ * e1000_change_mtu - Change the Maximum Transfer Unit
+ * @netdev: network interface device structure
+ * @new_mtu: new value for maximum frame size
+ *
+ * Returns 0 on success, negative on failure
+ **/
+static int e1000_change_mtu(struct net_device *netdev, int new_mtu)
+{
+ int max_frame = new_mtu + netdev->enc_hdr_len + ETH_HLEN + ETH_FCS_LEN;
+
+ return e1000_change_max_frame(netdev, max_frame, new_mtu);
+}
+
static int e1000_mii_ioctl(struct net_device *netdev, struct ifreq *ifr,
int cmd)
{
@@ -6889,7 +6902,8 @@ static netdev_features_t e1000_fix_features(struct net_device *netdev,
struct e1000_hw *hw = &adapter->hw;
/* Jumbo frame workaround on 82579 and newer requires CRC be stripped */
- if ((hw->mac.type >= e1000_pch2lan) && (netdev->mtu > ETH_DATA_LEN))
+ if (hw->mac.type >= e1000_pch2lan &&
+ adapter->max_frame_size > VLAN_ETH_FRAME_LEN + ETH_FCS_LEN)
features &= ~NETIF_F_RXFCS;
return features;
@@ -6933,6 +6947,24 @@ static int e1000_set_features(struct net_device *netdev,
return 0;
}
+/**
+ * e1000_enc_hdr_len - Expand encapsulation header room
+ * @netdev: network interface device structure
+ * @new_mtu: new value for maximum encapsulation header length
+ *
+ * Returns 0 on success, negative on failure
+ **/
+static int e1000_enc_hdr_len(struct net_device *netdev, int new_len)
+{
+ struct e1000_adapter *adapter = netdev_priv(netdev);
+ int max_frame = netdev->mtu + new_len + ETH_HLEN + ETH_FCS_LEN;
+
+ if (max_frame <= adapter->max_frame_size)
+ return 0;
+
+ return e1000_change_max_frame(netdev, max_frame, 0);
+}
+
static const struct net_device_ops e1000e_netdev_ops = {
.ndo_open = e1000_open,
.ndo_stop = e1000_close,
@@ -6953,6 +6985,7 @@ static const struct net_device_ops e1000e_netdev_ops = {
.ndo_set_features = e1000_set_features,
.ndo_fix_features = e1000_fix_features,
.ndo_features_check = passthru_features_check,
+ .ndo_enc_hdr_len = e1000_enc_hdr_len,
};
/**
@@ -7075,6 +7108,8 @@ static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
netdev->mem_start = mmio_start;
netdev->mem_end = mmio_start + mmio_len;
+ netdev->enc_hdr_len = VLAN_HLEN;
+
adapter->bd_number = cards_found++;
e1000e_check_options(adapter);
--
1.8.1.2
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