ixgbe: Enable Jumbo Frames on the X540 10Gigabit Controller
The X540 controller supports jumbo frames in SR-IOV mode. Allow
configuration of jumbo frames either in the PF driver or on behalf of
a VF.
Signed-off-by: Greg Rose <gregory.v.rose@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ixgbe/ixgbe_sriov.c b/drivers/net/ixgbe/ixgbe_sriov.c
index 187b3a1..fb4868d 100644
--- a/drivers/net/ixgbe/ixgbe_sriov.c
+++ b/drivers/net/ixgbe/ixgbe_sriov.c
@@ -110,6 +110,33 @@
return adapter->hw.mac.ops.set_vfta(&adapter->hw, vid, vf, (bool)add);
}
+void ixgbe_set_vf_lpe(struct ixgbe_adapter *adapter, u32 *msgbuf)
+{
+ struct ixgbe_hw *hw = &adapter->hw;
+ int new_mtu = msgbuf[1];
+ u32 max_frs;
+ int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;
+
+ /* Only X540 supports jumbo frames in IOV mode */
+ if (adapter->hw.mac.type != ixgbe_mac_X540)
+ return;
+
+ /* MTU < 68 is an error and causes problems on some kernels */
+ if ((new_mtu < 68) || (max_frame > IXGBE_MAX_JUMBO_FRAME_SIZE)) {
+ e_err(drv, "VF mtu %d out of range\n", new_mtu);
+ return;
+ }
+
+ max_frs = (IXGBE_READ_REG(hw, IXGBE_MAXFRS) &
+ IXGBE_MHADD_MFS_MASK) >> IXGBE_MHADD_MFS_SHIFT;
+ if (max_frs < new_mtu) {
+ max_frs = new_mtu << IXGBE_MHADD_MFS_SHIFT;
+ IXGBE_WRITE_REG(hw, IXGBE_MAXFRS, max_frs);
+ }
+
+ e_info(hw, "VF requests change max MTU to %d\n", new_mtu);
+}
+
static void ixgbe_set_vmolr(struct ixgbe_hw *hw, u32 vf, bool aupe)
{
u32 vmolr = IXGBE_READ_REG(hw, IXGBE_VMOLR(vf));
@@ -302,7 +329,7 @@
hash_list, vf);
break;
case IXGBE_VF_SET_LPE:
- WARN_ON((msgbuf[0] & 0xFFFF) == IXGBE_VF_SET_LPE);
+ ixgbe_set_vf_lpe(adapter, msgbuf);
break;
case IXGBE_VF_SET_VLAN:
add = (msgbuf[0] & IXGBE_VT_MSGINFO_MASK)