Hi, > -----Original Message----- > From: Alexander Kozyrev <akozy...@mellanox.com> > Sent: Friday, April 10, 2020 1:24 AM > To: dev@dpdk.org > Cc: Raslan Darawsheh <rasl...@mellanox.com>; Matan Azrad > <ma...@mellanox.com>; Slava Ovsiienko <viachesl...@mellanox.com> > Subject: [PATCH v4 0/3] net/mlx5: add large packet size support to MPRQ > > In order to support the 9K MTU the MPRQ feature should be updated > to allow a packet to take more than one stride (single linear buffer). > Receiving a packet into multiple adjacent strides should be implemented. > The reason preventing the packet to be received into multiple strides is > that the data buffer must be preceded with some HEAD_ROOM space. > In the current implementation the HEAD_ROOM space is borrowed by the > PMD > from the tail of the preceding stride. If packet takes multiple strides > the tail of stride may be overwritten with a packet data and the memory > can't be borrowed to provide the HEAD_ROOM space for the next packet. > Special care is needed to prevent the HEAD_ROOM corruption as such: > - copy a whole packet into a separate memory buffer if scatter is off > - copy an overlapping data only and craft a multi-segment mbuf otherwise > After multi-stride support for packets receiving is in place it is > possible to reduce the stride size for more efficient memory utilization. > Introduce the mprq_log_stride_size device parameter to configure > a stride size for MPRQ. Default stride size is set to 2048 bytes. > > Signed-off-by: Alexander Kozyrev <akozy...@mellanox.com> > --- > v1: > https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpatch > work.dpdk.org%2Fcover%2F67558%2F&data=02%7C01%7Crasland%40 > mellanox.com%7Cb4e88289699c4d57cba508d7dcd4caf2%7Ca652971c7d2e4d9 > ba6a4d149256f461b%7C0%7C0%7C637220678808646094&sdata=3aiMgH > dWFEaCMh6Vw%2B3lzU9wr9C8FkZcpQN5jq1%2BWGg%3D&reserved=0 > v2: > https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpatch > work.dpdk.org%2Fcover%2F67670%2F&data=02%7C01%7Crasland%40 > mellanox.com%7Cb4e88289699c4d57cba508d7dcd4caf2%7Ca652971c7d2e4d9 > ba6a4d149256f461b%7C0%7C0%7C637220678808646094&sdata=rw%2FR > FqaQAY9gnScLNMTc%2Fg2NqKT6yuHal%2FP7vLdTf%2BY%3D&reserved > =0 > merge documentation and implementation in one commit > v3: > https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpatch > work.dpdk.org%2Fpatch%2F68085%2F&data=02%7C01%7Crasland%40 > mellanox.com%7Cb4e88289699c4d57cba508d7dcd4caf2%7Ca652971c7d2e4d9 > ba6a4d149256f461b%7C0%7C0%7C637220678808646094&sdata=asYoyH > y7r0hkU7Vgw%2Fjo1Zp%2B0UKZv%2BRB7iinXg%2B6mMw%3D&reserv > ed=0 > rollback to simple burst Rx in case the packet size is too big > to fit into the stride and the stride size is not configured > v4: fix typo in code comments > > Alexander Kozyrev (3): > net/mlx5: add a devarg to specify MPRQ stride size > net/mlx5: enable MPRQ multi-stride operations > net/mlx5: add multi-segment packets in MPRQ mode > > doc/guides/nics/mlx5.rst | 17 ++++- > doc/guides/rel_notes/release_20_05.rst | 1 + > drivers/net/mlx5/mlx5.c | 34 ++++++++-- > drivers/net/mlx5/mlx5.h | 1 + > drivers/net/mlx5/mlx5_defs.h | 3 + > drivers/net/mlx5/mlx5_rxq.c | 70 +++++++++++--------- > drivers/net/mlx5/mlx5_rxtx.c | 113 +++++++++++++++++++------------- > - > drivers/net/mlx5/mlx5_rxtx.h | 2 +- > 8 files changed, 154 insertions(+), 87 deletions(-) > > -- > 1.8.3.1
Series applied to next-net-mlx, Kindest regards, Raslan Darawsheh
