mbox series

[v3,0/8] ethdev: introduce shared Rx queue

Message ID 20210917080121.329373-1-xuemingl@nvidia.com (mailing list archive)
Headers
Series ethdev: introduce shared Rx queue |

Message

Xueming Li Sept. 17, 2021, 8:01 a.m. UTC 
  In current DPDK framework, all RX queues is pre-loaded with mbufs for
incoming packets. When number of representors scale out in a switch
domain, the memory consumption became significant. Further more,
polling all ports leads to high cache miss, high latency and low
throughputs.

This patch introduces shared RX queue. PF and representors with same
configuration in same switch domain could share RX queue set by
specifying shared Rx queue offloading flag and sharing group.

All ports that Shared Rx queue actually shares One Rx queue and only
pre-load mbufs to one Rx queue, memory is saved.

Polling any queue using same shared RX queue receives packets from all
member ports. Source port is identified by mbuf->port.

Multiple groups is supported by group ID. Port queue number in a shared
group should be identical. Queue index is 1:1 mapped in shared group.
An example of polling two share groups:
  core	group	queue
  0	0	0
  1	0	1
  2	0	2
  3	0	3
  4	1	0
  5	1	1
  6	1	2
  7	1	3

Shared RX queue must be polled on single thread or core. If both PF0 and
representor0 joined same share group, can't poll pf0rxq0 on core1 and
rep0rxq0 on core2. Actually, polling one port within share group is
sufficient since polling any port in group will return packets for any
port in group.

v1:
  - initial version
v2:
  - add testpmd patches
v3:
  - change common forwarding api to macro for performance, thanks Jerin.
  - save global variable accessed in forwarding to flowstream to minimize
    cache miss
  - combined patches for each forwarding engine
  - support multiple groups in testpmd "--share-rxq" parameter
  - new api to aggerate shared rxq group

Xiaoyu Min (1):
  app/testpmd: add common fwd wrapper

Xueming Li (7):
  ethdev: introduce shared Rx queue
  ethdev: new API to aggregate shared Rx queue group
  app/testpmd: dump port and queue info for each packet
  app/testpmd: new parameter to enable shared Rx queue
  app/testpmd: force shared Rx queue polled on same core
  app/testpmd: improve forwarding cache miss
  app/testpmd: support shared Rx queue forwarding

 app/test-pmd/5tswap.c                         |  25 +---
 app/test-pmd/config.c                         | 120 +++++++++++++++++-
 app/test-pmd/csumonly.c                       |  25 +---
 app/test-pmd/flowgen.c                        |  26 ++--
 app/test-pmd/icmpecho.c                       |  30 ++---
 app/test-pmd/ieee1588fwd.c                    |  30 +++--
 app/test-pmd/iofwd.c                          |  24 +---
 app/test-pmd/macfwd.c                         |  24 +---
 app/test-pmd/macswap.c                        |  23 +---
 app/test-pmd/noisy_vnf.c                      |   2 +-
 app/test-pmd/parameters.c                     |  13 ++
 app/test-pmd/rxonly.c                         |  32 ++---
 app/test-pmd/testpmd.c                        |  91 ++++++++++++-
 app/test-pmd/testpmd.h                        |  47 ++++++-
 app/test-pmd/txonly.c                         |   8 +-
 app/test-pmd/util.c                           |   1 +
 doc/guides/nics/features.rst                  |  11 ++
 doc/guides/nics/features/default.ini          |   1 +
 .../prog_guide/switch_representation.rst      |  10 ++
 doc/guides/testpmd_app_ug/run_app.rst         |   5 +
 lib/ethdev/ethdev_driver.h                    |  23 +++-
 lib/ethdev/rte_ethdev.c                       |  23 ++++
 lib/ethdev/rte_ethdev.h                       |  23 ++++
 lib/ethdev/version.map                        |   3 +
 24 files changed, 432 insertions(+), 188 deletions(-)