[dpdk-dev] [PATCH 0/4] net/bonding: bonding and LACP fixes

[Robert Sanford]

In this patch series, we fix two bonding driver bugs and
enhance testpmd so that bonding mode 4 (LACP) ports remain
operational even when idle.

1. Problem: testpmd does not call bonding mode 4 (LACP) ports' tx
   burst function at least every 100 ms, as mandated.
   Solution: Enhance testpmd's packet forwarding loop to infrequently
   invoke the tx burst API for bonding ports in mode 4, to transmit
   LACPDUs to the partner in a timely manner.
2. Problem: Bonding driver (item 3 below) needs to know how many
   objects may become cached in a memory pool. Solution: Rename
   macros that calculate a mempool cache flush threshold, and move
   them from rte_mempool.c to rte_mempool.h.
3. Problem: With little or no tx traffic, LACP tx machine may run out
   of mbufs. Solution: When calculating the minimum number of mbufs
   required in a bonding mode 4 slave's private (tx LACPDU) pool,
   include the maximum number of mbufs that may be cached in the
   pool's per-core caches.
4. Problem: When configuring a bonding device, we don't properly
   propagate most of the settings from the master to the slaves.
   Solution: Fix slave_configure() to correctly pass configuration
   data to rte_eth_dev_configure() on behalf of the slaves.

Notes for configuring and running testpmd: We specify four ethernet
devices in the arguments, because testpmd expects an even number.
We configure two devices to be slaves under one bonded device, one
device to be the other side of the forwarding bridge, and we ignore
the fourth eth dev.

 +-------------+    +-------+     +--------+
 |client A     |<==>|DPDK   |     |        |
 |bonded device|    |testpmd|<===>|client B|
 |with 2 slaves|<==>|       |     |        |
 +-------------+    +-------+     +--------+

To reproduce the out of buffers problem (#3), apply patch 1/4, run
testpmd (with example args and commands shown below), and run ping
from client A, like this: "ping -i18 -c10 clientB". After about five
minutes, one of the slaves will run out of LACPDU mbufs.

Example testpmd args:

  ./testpmd -c 0x00000555 -n 2 \
    --log-level 7 \
    --pci-whitelist "01:00.0" \
    --pci-whitelist "01:00.1" \
    --pci-whitelist "05:00.0" \
    --pci-whitelist "84:00.0" \
    --master-lcore 0 -- \
    --interactive --portmask=0xf --numa --socket-num=0 --auto-start \
    --coremask=0x00000554 --rxd=512 --txd=256 \
    --burst=32 --mbcache=64 \
    --nb-cores=2 --rxq=1 --txq=1

Example testpmd commands to reconfigure into bonding mode 4:

  stop
  port stop all
  create bonded device 4 0
  add bonding slave 2 4
  add bonding slave 3 4
  port start 0
  port start 1
  port start 4
  set portlist 4,0
  start

Robert Sanford (4):
  testpmd: fix LACP ports to work with idle links
  mempool: make cache flush threshold macro public
  net/bonding: another fix to LACP mempool size
  net/bonding: fix configuration of LACP slaves

 app/test-pmd/cmdline.c                    |    9 +++++++
 app/test-pmd/testpmd.c                    |   37 +++++++++++++++++++++++++++++
 app/test-pmd/testpmd.h                    |    4 +++
 drivers/net/bonding/rte_eth_bond_8023ad.c |   10 +++++--
 drivers/net/bonding/rte_eth_bond_pmd.c    |   28 +++++----------------
 lib/librte_mempool/rte_mempool.c          |    8 +----
 lib/librte_mempool/rte_mempool.h          |    7 +++++
 7 files changed, 73 insertions(+), 30 deletions(-)