netdev - [RFC PATCH 0/3] kernel: add support for 256-bit IO access

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Date:   Mon, 19 Mar 2018 19:50:33 +0530
From:   Rahul Lakkireddy <rahul.lakkireddy@...lsio.com>
To:     x86@...nel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        davem@...emloft.net, akpm@...ux-foundation.org,
        torvalds@...ux-foundation.org, ganeshgr@...lsio.com,
        nirranjan@...lsio.com, indranil@...lsio.com,
        Rahul Lakkireddy <rahul.lakkireddy@...lsio.com>
Subject: [RFC PATCH 0/3] kernel: add support for 256-bit IO access

This series of patches add support for 256-bit IO read and write.
The APIs are readqq and writeqq (quad quadword - 4 x 64), that read
and write 256-bits at a time from IO, respectively.

Patch 1 adds u256 type and adds necessary non-atomic accessors.  Also
adds byteorder conversion APIs.

Patch 2 adds 256-bit read and write to x86 via VMOVDQU AVX CPU
instructions.

Patch 3 updates cxgb4 driver to use the readqq API to speed up
reading on-chip memory 256-bits at a time.

Feedback and suggestions will be much appreciated.

Thanks,
Rahul

Rahul Lakkireddy (3):
  include/linux: add 256-bit IO accessors
  x86/io: implement 256-bit IO read and write
  cxgb4: read on-chip memory 256-bits at a time

 arch/x86/include/asm/io.h                      | 57 ++++++++++++++++++++++++-
 drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c | 16 +++----
 drivers/net/ethernet/chelsio/cxgb4/cxgb4.h     |  6 +++
 include/linux/byteorder/generic.h              | 48 +++++++++++++++++++++
 include/linux/io-64-nonatomic-hi-lo.h          | 59 ++++++++++++++++++++++++++
 include/linux/io-64-nonatomic-lo-hi.h          | 59 ++++++++++++++++++++++++++
 include/linux/types.h                          |  7 +++
 7 files changed, 243 insertions(+), 9 deletions(-)

-- 
2.14.1