On Mon, Oct 31, 2016 at 12:21:33PM +0200, Leon Romanovsky wrote: > 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 Hi Doug, Please drop this patch series, we discovered an issue with proposed modify_qp implementation and will respin it. Sorry for the inconvenience. Thanks > > 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 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-rdma" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html
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