netdev - [v2 net-next PATCH 0/2] Add ethtool support for completion queue event size

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Message-ID: <1645555153-4932-1-git-send-email-sbhatta@marvell.com>
Date:   Wed, 23 Feb 2022 00:09:11 +0530
From:   Subbaraya Sundeep <sbhatta@...vell.com>
To:     <davem@...emloft.net>, <kuba@...nel.org>, <netdev@...r.kernel.org>,
        <sundeep.lkml@...il.com>
CC:     <hkelam@...vell.com>, <gakula@...vell.com>, <sgoutham@...vell.com>,
        Subbaraya Sundeep <sbhatta@...vell.com>
Subject: [v2 net-next PATCH 0/2] Add ethtool support for completion queue event size

After a packet is sent or received by NIC then NIC posts
a completion queue event which consists of transmission status
(like send success or error) and received status(like
pointers to packet fragments). These completion events may
also use a ring similar to rx and tx rings. This patchset
introduces cqe-size ethtool parameter to modify the size
of the completion queue event if NIC hardware has that capability.
A bigger completion queue event can have more receive buffer pointers
inturn NIC can transfer a bigger frame from wire as long as
hardware(MAC) receive frame size limit is not exceeded.

Patch 1 adds support setting/getting cqe-size via
ethtool -G and ethtool -g.

Patch 2 includes octeontx2 driver changes to use
completion queue event size set from ethtool -G.

v2 changes:
	As per Jakub suggestions renamed ce size to cqe size
	Added documentation for cqe size

Thanks,
Sundeep

Subbaraya Sundeep (2):
  ethtool: add support to set/get completion queue event size
  octeontx2-pf: Vary completion queue event size

 Documentation/networking/ethtool-netlink.rst          | 11 +++++++++++
 .../net/ethernet/marvell/octeontx2/nic/otx2_common.c  |  4 ++--
 .../net/ethernet/marvell/octeontx2/nic/otx2_common.h  |  1 +
 .../net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c | 17 ++++++++++++++---
 drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c  |  2 ++
 drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c  |  2 ++
 include/linux/ethtool.h                               |  4 ++++
 include/uapi/linux/ethtool_netlink.h                  |  1 +
 net/ethtool/netlink.h                                 |  2 +-
 net/ethtool/rings.c                                   | 19 +++++++++++++++++--
 10 files changed, 55 insertions(+), 8 deletions(-)

-- 
2.7.4