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ixgbe: Document how to enable NBASE-T support

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[ Upstream commit 271225fd57c2f1e0b3f8826df51be6c634affefe ]

Commit a296d665ea ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Robert Schlabbach
2021-10-26 02:24:48 +02:00
committed by Greg Kroah-Hartman
parent 776ed8b366
commit 48e01e3881
2 changed files with 20 additions and 0 deletions
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16
Documentation/networking/device_drivers/ethernet/intel/ixgbe.rst
View File

@@ -440,6 +440,22 @@ NOTE: For 82599-based network connections, if you are enabling jumbo frames in
a virtual function (VF), jumbo frames must first be enabled in the physical a virtual function (VF), jumbo frames must first be enabled in the physical
function (PF). The VF MTU setting cannot be larger than the PF MTU. function (PF). The VF MTU setting cannot be larger than the PF MTU.
NBASE-T Support
---------------
The ixgbe driver supports NBASE-T on some devices. However, the advertisement
of NBASE-T speeds is suppressed by default, to accommodate broken network
switches which cannot cope with advertised NBASE-T speeds. Use the ethtool
command to enable advertising NBASE-T speeds on devices which support it::
ethtool -s eth? advertise 0x1800000001028
On Linux systems with INTERFACES(5), this can be specified as a pre-up command
in /etc/network/interfaces so that the interface is always brought up with
NBASE-T support, e.g.::
iface eth? inet dhcp
pre-up ethtool -s eth? advertise 0x1800000001028 || true
Generic Receive Offload, aka GRO Generic Receive Offload, aka GRO
-------------------------------- --------------------------------
The driver supports the in-kernel software implementation of GRO. GRO has The driver supports the in-kernel software implementation of GRO. GRO has

4
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
View File

@@ -5532,6 +5532,10 @@ static int ixgbe_non_sfp_link_config(struct ixgbe_hw *hw)
if (!speed && hw->mac.ops.get_link_capabilities) { if (!speed && hw->mac.ops.get_link_capabilities) {
ret = hw->mac.ops.get_link_capabilities(hw, &speed, ret = hw->mac.ops.get_link_capabilities(hw, &speed,
&autoneg); &autoneg);
/* remove NBASE-T speeds from default autonegotiation
* to accommodate broken network switches in the field
* which cannot cope with advertised NBASE-T speeds
*/
speed &= ~(IXGBE_LINK_SPEED_5GB_FULL | speed &= ~(IXGBE_LINK_SPEED_5GB_FULL |
IXGBE_LINK_SPEED_2_5GB_FULL); IXGBE_LINK_SPEED_2_5GB_FULL);
} }