e1000e: Driver workaround for IPv6 Header Extension Erratum.

Previously, IPv6 extension header parsing was disabled for all devices
supported by e1000e when using packet split mode. However, as per a
silicon errata, only certain devices need this restriction and will need
to disable IPv6 extension header parsing for all modes.

Signed-off-by: Matthew Vick <matthew.vick@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

4 files changed, 26 insertions, 8 deletions

diff --git a/drivers/net/ethernet/intel/e1000e/80003es2lan.c b/drivers/net/ethernet/intel/e1000e/80003es2lan.c
index 66f9877bc4ec..4dd18a1f45d2 100644
--- a/drivers/net/ethernet/intel/e1000e/80003es2lan.c
+++ b/drivers/net/ethernet/intel/e1000e/80003es2lan.c
@@ -944,6 +944,14 @@ static void e1000_initialize_hw_bits_80003es2lan(struct e1000_hw *hw)
         else
                 reg |= (1 << 28);
         ew32(TARC(1), reg);
+
+        /*
+         * Disable IPv6 extension header parsing because some malformed
+         * IPv6 headers can hang the Rx.
+         */
+        reg = er32(RFCTL);
+        reg |= (E1000_RFCTL_IPV6_EX_DIS | E1000_RFCTL_NEW_IPV6_EXT_DIS);
+        ew32(RFCTL, reg);
 }
 
 /**
diff --git a/drivers/net/ethernet/intel/e1000e/82571.c b/drivers/net/ethernet/intel/e1000e/82571.c
index 7b02e87b0b65..98632f4561b2 100644
--- a/drivers/net/ethernet/intel/e1000e/82571.c
+++ b/drivers/net/ethernet/intel/e1000e/82571.c
@@ -1279,6 +1279,16 @@ static void e1000_initialize_hw_bits_82571(struct e1000_hw *hw)
                 ew32(CTRL_EXT, reg);
         }
 
+        /*
+         * Disable IPv6 extension header parsing because some malformed
+         * IPv6 headers can hang the Rx.
+         */
+        if (hw->mac.type <= e1000_82573) {
+                reg = er32(RFCTL);
+                reg |= (E1000_RFCTL_IPV6_EX_DIS | E1000_RFCTL_NEW_IPV6_EXT_DIS);
+                ew32(RFCTL, reg);
+        }
+
         /* PCI-Ex Control Registers */
         switch (hw->mac.type) {
         case e1000_82574:
diff --git a/drivers/net/ethernet/intel/e1000e/ich8lan.c b/drivers/net/ethernet/intel/e1000e/ich8lan.c
index c58ed26d85af..dfff4416cf4b 100644
--- a/drivers/net/ethernet/intel/e1000e/ich8lan.c
+++ b/drivers/net/ethernet/intel/e1000e/ich8lan.c
@@ -3468,6 +3468,13 @@ static void e1000_initialize_hw_bits_ich8lan(struct e1000_hw *hw)
          */
         reg = er32(RFCTL);
         reg |= (E1000_RFCTL_NFSW_DIS | E1000_RFCTL_NFSR_DIS);
+
+        /*
+         * Disable IPv6 extension header parsing because some malformed
+         * IPv6 headers can hang the Rx.
+         */
+        if (hw->mac.type == e1000_ich8lan)
+                reg |= (E1000_RFCTL_IPV6_EX_DIS | E1000_RFCTL_NEW_IPV6_EXT_DIS);
         ew32(RFCTL, reg);
 }
 
diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index e86b524a5b15..ab4505c99e67 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -2939,6 +2939,7 @@ static void e1000_setup_rctl(struct e1000_adapter *adapter)
         /* Enable Extended Status in all Receive Descriptors */
         rfctl = er32(RFCTL);
         rfctl |= E1000_RFCTL_EXTEN;
+        ew32(RFCTL, rfctl);
 
         /*
          * 82571 and greater support packet-split where the protocol
@@ -2964,13 +2965,6 @@ static void e1000_setup_rctl(struct e1000_adapter *adapter)
         if (adapter->rx_ps_pages) {
                 u32 psrctl = 0;
 
-                /*
-                 * disable packet split support for IPv6 extension headers,
-                 * because some malformed IPv6 headers can hang the Rx
-                 */
-                rfctl |= (E1000_RFCTL_IPV6_EX_DIS |
-                          E1000_RFCTL_NEW_IPV6_EXT_DIS);
-
                 /* Enable Packet split descriptors */
                 rctl |= E1000_RCTL_DTYP_PS;
 
@@ -3009,7 +3003,6 @@ static void e1000_setup_rctl(struct e1000_adapter *adapter)
                  */
         }
 
-        ew32(RFCTL, rfctl);
         ew32(RCTL, rctl);
         /* just started the receive unit, no need to restart */
         adapter->flags &= ~FLAG_RX_RESTART_NOW;