When sending from a 10G host to a 1G host, it is easy to overrun the receiver,
leading to packet loss and traffic backing off. Similar problems occur when
a 10G host sends data to a sub-10G virtual circuit, or a 40G host sending
to a 10G host. Packet pacing could control packet injection rate and reduces
network congestion to maximize throughput & minimize network latency.
Packet pacing is a rate limiting and shaping for a QP (SQ for RAW QP), set
and change the rate is done by modifying QP. This series of patch made the
following high level changes:
1. Report rate limit capabilities through user data. Reported capabilities
include: The maximum and minimum rate limit in kbps supported by packet
pacing; Bitmap showing which QP types are supported by packet pacing
operation.
2. Extend modify QP interface for growing attributes. Add rate limit support
to the extended interface.
3. Enable mlx5-based hardware to be able to update the rate limit for
RAW QP packet.
Available in the "topic/packet_pacing" topic branch of this git repo:
git://git.kernel.org/pub/scm/linux/kernel/git/leon/linux-rdma.git
Or for browsing:
https://git.kernel.org/cgit/linux/kernel/git/leon/linux-rdma.git/log/?h=topic/packet_pacing
Thanks,
Bodong & Leon
Bodong Wang (4):
IB/mlx5: Report mlx5 packet pacing capabilities when querying device
IB/core: Support rate limit for packet pacing
IB/uverbs: Extend modify_qp and support packet pacing
IB/mlx5: Update the rate limit according to user setting for RAW QP
drivers/infiniband/core/uverbs.h | 1 +
drivers/infiniband/core/uverbs_cmd.c | 178 +++++++++++++++++++++-------------
drivers/infiniband/core/uverbs_main.c | 1 +
drivers/infiniband/core/verbs.c | 2 +
drivers/infiniband/hw/mlx5/main.c | 16 ++-
drivers/infiniband/hw/mlx5/mlx5_ib.h | 1 +
drivers/infiniband/hw/mlx5/qp.c | 71 ++++++++++++--
include/rdma/ib_verbs.h | 2 +
include/uapi/rdma/ib_user_verbs.h | 12 +++
include/uapi/rdma/mlx5-abi.h | 13 +++
10 files changed, 219 insertions(+), 78 deletions(-)
--
2.7.4
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