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The CPSW CPDMA can process buffer descriptors placed as in internal CPPI RAM as in DDR. This patch adds support in CPSW and CPDMA for descs_pool_size mudule parameter, which defines total number of CPDMA CPPI descriptors to be used for both ingress/egress packets processing: - memory size, required for CPDMA descriptor pool, is calculated basing on number of descriptors specified by user in descs_pool_size and CPDMA descriptor size and allocated from coherent memory (CMA area); - CPDMA descriptor pool will be allocated in DDR if pool memory size > internal CPPI RAM or use internal CPPI RAM otherwise; - if descs_pool_size not specified in DT - the default value 256 will be used which will allow to place CPDMA descriptors pool into the internal CPPI RAM (current default behaviour); - CPDMA will ignore descs_pool_size if descs_pool_size = 0 for backward comaptiobility with davinci_emac. descs_pool_size is boot time setting and can't be changed once CPSW/CPDMA is initialized. Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.