netdev - [PATCH net-next 00/12] ibmvnic: Performance improvements and other updates

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Message-Id: <1605208207-1896-1-git-send-email-tlfalcon@linux.ibm.com>
Date:   Thu, 12 Nov 2020 13:09:55 -0600
From:   Thomas Falcon <tlfalcon@...ux.ibm.com>
To:     netdev@...r.kernel.org
Cc:     linuxppc-dev@...ts.ozlabs.org, dnbanerg@...ibm.com,
        brking@...ux.vnet.ibm.com, pradeep@...ibm.com,
        drt@...ux.vnet.ibm.com, sukadev@...ux.vnet.ibm.com,
        ljp@...ux.vnet.ibm.com, cforno12@...ux.ibm.com,
        tlfalcon@...ux.ibm.com, ricklind@...ux.ibm.com
Subject: [PATCH net-next 00/12] ibmvnic: Performance improvements and other updates

First, memory barrier protection of device queue reads to ensure RX
and TX buffer completions are not missed. The subsequent three
patches utilize a hypervisor call allowing multiple TX and RX buffer
replenishment descriptors to be sent in one operation, which
significantly reduces hypervisor call overhead. The xmit_more and
Byte Queue Limits API's are leveraged to provide this support
for TX descriptors.

The next four patches fix TX completion error handling, remove
superfluous code and members in TX completion handling function
and TX buffer structure respectively, update ndo_start_xmit error
handling and improve accuracy of statistics tracking, and remove
unused routines.

Finally, patches to ensure that device queue memory
is cache-line aligned, resolving slowdowns observed in PCI traces,
as well as optimizatons to the driver's NAPI polling function and 
to RX buffer replenishment are provided by Dwip Banerjee.

This series provides significant performance improvements, allowing
the driver to fully utilize 100Gb NIC's.

Dwip N. Banerjee (4):
  ibmvnic: Ensure that device queue memory is cache-line aligned
  ibmvnic: Correctly re-enable interrupts in NAPI polling routine
  ibmvnic: Use netdev_alloc_skb instead of alloc_skb to replenish RX
    buffers
  ibmvnic: Do not replenish RX buffers after every polling loop

Thomas Falcon (8):
  ibmvnic: Ensure that subCRQ entry reads are ordered
  ibmvnic: Introduce indirect subordinate Command Response Queue buffer
  ibmvnic: Introduce batched RX buffer descriptor transmission
  ibmvnic: Introduce xmit_more support using batched subCRQ hcalls
  ibmvnic: Fix TX completion error handling
  ibmvnic: Clean up TX code and TX buffer data structure
  ibmvnic: Clean up TX error handling and statistics tracking
  ibmvnic: Remove send_subcrq function

 drivers/net/ethernet/ibm/ibmvnic.c | 390 ++++++++++++++++-------------
 drivers/net/ethernet/ibm/ibmvnic.h |  30 +--
 2 files changed, 228 insertions(+), 192 deletions(-)

-- 
2.26.2