int efa_query_device_ctx()

in efawin/verbs.c [99:135]

• 34 lines of code
• 5 McCabe index (conditional complexity)

int efa_query_device_ctx(struct efa_context *ctx)
{
	struct efa_query_device_ex_resp resp;
	struct ibv_device_attr_ex attr;
	size_t resp_size = sizeof(resp);
	unsigned int qp_table_sz;
	int err;

	if (ctx->cmds_supp_udata_mask & EFA_USER_CMDS_SUPP_UDATA_QUERY_DEVICE) {
		err = ibv_cmd_query_device_any(&ctx->ibvctx.context, NULL,
					       &attr, sizeof(attr),
					       &resp.ibv_resp, &resp_size);
		if (err)
			return err;

		ctx->device_caps = resp.device_caps;
		ctx->max_sq_wr = resp.max_sq_wr;
		ctx->max_rq_wr = resp.max_rq_wr;
		ctx->max_sq_sge = resp.max_sq_sge;
		ctx->max_rq_sge = resp.max_rq_sge;
		ctx->max_rdma_size = resp.max_rdma_size;
	} else {
		err = ibv_cmd_query_device_any(&ctx->ibvctx.context, NULL,
					       &attr, sizeof(attr.orig_attr),
					       NULL, NULL);
		if (err)
			return err;
	}

	ctx->max_wr_rdma_sge = attr.orig_attr.max_sge_rd;
	qp_table_sz = roundup_pow_of_two(attr.orig_attr.max_qp);
	ctx->qp_table_sz_m1 = qp_table_sz - 1;
	ctx->qp_table = calloc(qp_table_sz, sizeof(*ctx->qp_table));
	if (!ctx->qp_table)
		return ENOMEM;
	return 0;
}