[dpdk-dev] [PATCH v2 0/6]: Add LRO support to ixgbe PMD

[Vlad Zolotarov <vladz@cloudius-systems.com>]

This series adds the missing flow for enabling the LRO in the ethdev and
adds a support for this feature in the ixgbe PMD. There is a big hope that this
initiative is going to be picked up by some Intel developer that would add the LRO support
to other Intel PMDs. ;)
 
The series starts with some cleanup work in the code the final patch (the actual adding of
the LRO support) is going to touch/use/change. There are still quite a few issues in the ixgbe
PMD code left but they have to be a matter of a different series and I've left a few "TODO"
remarks in the code.
 
The LRO ("RSC" in Intel's context) PMD completion handling code follows the same design as the
corresponding Linux and FreeBSD implementation: pass the aggregation's cluster HEAD buffer to
the NEXTP entry of the software ring till EOP is met.
 
HW configuration follows the corresponding specs: this feature is supported only by x540 and
82599 PF devices.
 
The feature has been tested with seastar TCP stack with the following configuration on Tx side:
   - MTU: 400B
   - 100 concurrent TCP connections.
 
The results were:
   - Without LRO: total throughput: 0.12Gbps, coefficient of variance: 1.41%
   - With LRO:    total throughput: 8.21Gbps, coefficient of variance: 0.59%

This is an almost factor 80 improvement.

New in v2:
   - Removed rte_eth_dev_data.lro_bulk_alloc and added ixgbe_hw.rx_bulk_alloc_allowed
     instead.
   - Unified the rx_pkt_bulk callback setting (a separate new patch).
   - Fixed a few styling and spelling issues.

Vlad Zolotarov (6):
  ixgbe: Cleanups
  ixgbe: Bug fix: Properly configure Rx CRC stripping for x540 devices
  ixgbe: Code refactoring
  ixgbe: Unify the rx_pkt_bulk callback initialization
  common_linuxapp: Added CONFIG_RTE_ETHDEV_LRO_SUPPORT option
  ixgbe: Add LRO support

 config/common_linuxapp                  |   1 +
 lib/librte_ether/rte_ethdev.h           |   6 +-
 lib/librte_pmd_ixgbe/ixgbe/ixgbe_type.h |   1 +
 lib/librte_pmd_ixgbe/ixgbe_ethdev.c     |  22 +-
 lib/librte_pmd_ixgbe/ixgbe_ethdev.h     |   5 +
 lib/librte_pmd_ixgbe/ixgbe_rxtx.c       | 869 +++++++++++++++++++++++++++-----
 lib/librte_pmd_ixgbe/ixgbe_rxtx.h       |  26 +-
 7 files changed, 798 insertions(+), 132 deletions(-)

-- 
2.1.0