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The SRQ in the hns driver consists of the following four parts: * wqe buf: the buffer to store WQE. * wqe_idx buf: the cqe of SRQ may be not generated in the order of wqe, so the wqe_idx corresponding to the idle WQE needs to be pushed into the index queue which is a FIFO, then it instructs the hardware to obtain the corresponding WQE. * bitmap: bitmap is used to generate and release wqe_idx. When the user has a new WR, the driver finds the idx of the idle wqe in bitmap. When the CQE of wqe is generated, the driver will release the idx. * wr_id buf: wr_id buf is used to store the user's wr_id, then return it to the user when poll_cq verb is invoked. The process of post SRQ recv is refactored to make preceding code clearer. Link: https://lore.kernel.org/r/1611997090-48820-12-git-send-email-liweihang@huawei.com Signed-off-by: Wenpeng Liang <liangwenpeng@huawei.com> Signed-off-by: Weihang Li <liweihang@huawei.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>