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27ef6a9981
For SMC-R V2, llc msg can be larger than SMC_WR_BUF_SIZE, thus every recv wr has 2 sges, the first sge with length SMC_WR_BUF_SIZE is for V1/V2 compatible llc/cdc msg, and the second sge with length SMC_WR_BUF_V2_SIZE-SMC_WR_TX_SIZE is for V2 specific llc msg, like SMC_LLC_DELETE_RKEY and SMC_LLC_ADD_LINK for SMC-R V2. The memory buffer in the second sge is shared by all recv wr in one link and all link in one lgr for saving memory usage purpose. But not all RDMA devices with max_recv_sge greater than 1. Thus SMC-R V2 can not support on such RDMA devices and SMC_CLC_DECL_INTERR fallback happens because of the failure of create qp. This patch introduce the support for SMC-R V2 on RDMA devices with max_recv_sge equals to 1. Every recv wr has only one sge with individual buffer whose size is SMC_WR_BUF_V2_SIZE once the RDMA device's max_recv_sge equals to 1. It may use more memory, but it is better than SMC_CLC_DECL_INTERR fallback. Co-developed-by: Wen Gu <guwen@linux.alibaba.com> Signed-off-by: Wen Gu <guwen@linux.alibaba.com> Signed-off-by: Guangguan Wang <guangguan.wang@linux.alibaba.com> Reviewed-by: Wenjia Zhang <wenjia@linux.ibm.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.