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 v4:
- Remove CONFIG_RTE_ETHDEV_LRO_SUPPORT from config/common_linuxapp.
- Define RTE_ETHDEV_HAS_LRO_SUPPORT in rte_ethdev.h.
- As a result of "ixgbe: check rxd number to avoid mbuf leak" (352078e8e)
Vector Rx
had to get the same treatment as Rx Bulk Alloc (see PATCH4 for more
details).
New in v3:
- ixgbe_rx_alloc_bufs(): Always reset refcnt of the buffers to 1. Otherwise
rte_pktmbuf_free()
won't free them.
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 (5):
ixgbe: Cleanups
ixgbe: Bug fix: Properly configure Rx CRC stripping for x540 devices
ixgbe: Code refactoring
ixgbe: Unify the rx_pkt_bulk callback initialization
ixgbe: Add LRO support
lib/librte_ether/rte_ethdev.h | 9 +-
lib/librte_pmd_ixgbe/ixgbe/ixgbe_type.h | 2 +
lib/librte_pmd_ixgbe/ixgbe_ethdev.c | 19 +-
lib/librte_pmd_ixgbe/ixgbe_ethdev.h | 5 +
lib/librte_pmd_ixgbe/ixgbe_rxtx.c | 886 +++++++++++++++++++++++++++-----
lib/librte_pmd_ixgbe/ixgbe_rxtx.h | 28 +-
6 files changed, 815 insertions(+), 134 deletions(-)
--
2.1.0
