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ethtool: set device ring sizes with RINGS_SET request

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Implement RINGS_SET netlink request to set ring sizes of a network device.
These are traditionally set with ETHTOOL_SRINGPARAM ioctl request.

Like the ioctl implementation, the generic ethtool code checks if supplied
values do not exceed driver defined limits; if they do, first offending
attribute is reported using extack.

v2:
  - fix netdev reference leak in error path (found by Jakub Kicinsky)

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michal Kubecek
2020-03-12 21:08:28 +01:00
committed by David S. Miller
parent e4a1717b67
commit 2fc2929e80
5 changed files with 118 additions and 1 deletions
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23
Documentation/networking/ethtool-netlink.rst
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@@ -194,6 +194,7 @@ Userspace to kernel:
``ETHTOOL_MSG_PRIVFLAGS_GET`` get private flags
``ETHTOOL_MSG_PRIVFLAGS_SET`` set private flags
``ETHTOOL_MSG_RINGS_GET`` get ring sizes
``ETHTOOL_MSG_RINGS_SET`` set ring sizes
===================================== ================================
Kernel to userspace:
@@ -673,6 +674,26 @@ Kernel response contents:
==================================== ====== ==========================
RINGS_SET
=========
Sets ring sizes like ``ETHTOOL_SRINGPARAM`` ioctl request.
Request contents:
==================================== ====== ==========================
``ETHTOOL_A_RINGS_HEADER`` nested reply header
``ETHTOOL_A_RINGS_RX`` u32 size of RX ring
``ETHTOOL_A_RINGS_RX_MINI`` u32 size of RX mini ring
``ETHTOOL_A_RINGS_RX_JUMBO`` u32 size of RX jumbo ring
``ETHTOOL_A_RINGS_TX`` u32 size of TX ring
==================================== ====== ==========================
Kernel checks that requested ring sizes do not exceed limits reported by
driver. Driver may impose additional constraints and may not suspport all
attributes.
Request translation
===================
@@ -700,7 +721,7 @@ have their netlink replacement yet.
``ETHTOOL_GCOALESCE`` n/a
``ETHTOOL_SCOALESCE`` n/a
``ETHTOOL_GRINGPARAM`` ``ETHTOOL_MSG_RINGS_GET``
``ETHTOOL_SRINGPARAM`` n/a
``ETHTOOL_SRINGPARAM`` ``ETHTOOL_MSG_RINGS_SET``
``ETHTOOL_GPAUSEPARAM`` n/a
``ETHTOOL_SPAUSEPARAM`` n/a
``ETHTOOL_GRXCSUM`` ``ETHTOOL_MSG_FEATURES_GET``