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ixgbe: Document how to enable NBASE-T support
Commita296d665ea
("ixgbe: Add ethtool support to enable 2.5 and 5.0 Gbps support") introduced suppression of the advertisement of NBASE-T speeds by default, according to Todd Fujinaka to accommodate customers with network switches which could not cope with advertised NBASE-T speeds, as posted in the E1000-devel mailing list: https://sourceforge.net/p/e1000/mailman/message/37106269/ However, the suppression was not documented at all, nor was how to enable NBASE-T support. Properly document the NBASE-T suppression and how to enable NBASE-T support. Fixes:a296d665ea
("ixgbe: Add ethtool support to enable 2.5 and 5.0 Gbps support") Reported-by: Robert Schlabbach <robert_s@gmx.net> Signed-off-by: Robert Schlabbach <robert_s@gmx.net> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
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@ -440,6 +440,22 @@ NOTE: For 82599-based network connections, if you are enabling jumbo frames in
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a virtual function (VF), jumbo frames must first be enabled in the physical
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function (PF). The VF MTU setting cannot be larger than the PF MTU.
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NBASE-T Support
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---------------
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The ixgbe driver supports NBASE-T on some devices. However, the advertisement
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of NBASE-T speeds is suppressed by default, to accommodate broken network
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switches which cannot cope with advertised NBASE-T speeds. Use the ethtool
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command to enable advertising NBASE-T speeds on devices which support it::
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ethtool -s eth? advertise 0x1800000001028
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On Linux systems with INTERFACES(5), this can be specified as a pre-up command
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in /etc/network/interfaces so that the interface is always brought up with
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NBASE-T support, e.g.::
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iface eth? inet dhcp
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pre-up ethtool -s eth? advertise 0x1800000001028 || true
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Generic Receive Offload, aka GRO
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--------------------------------
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The driver supports the in-kernel software implementation of GRO. GRO has
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@ -5531,6 +5531,10 @@ static int ixgbe_non_sfp_link_config(struct ixgbe_hw *hw)
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if (!speed && hw->mac.ops.get_link_capabilities) {
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ret = hw->mac.ops.get_link_capabilities(hw, &speed,
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&autoneg);
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/* remove NBASE-T speeds from default autonegotiation
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* to accommodate broken network switches in the field
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* which cannot cope with advertised NBASE-T speeds
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*/
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speed &= ~(IXGBE_LINK_SPEED_5GB_FULL |
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IXGBE_LINK_SPEED_2_5GB_FULL);
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}
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