From mboxrd@z Thu Jan 1 00:00:00 1970 From: Remy Horton Subject: Re: [PATCH v4 1/2] ethdev: remove get_reg_length callback Date: Mon, 27 Jun 2016 11:46:08 +0100 Message-ID: References: <1466688410-13826-1-git-send-email-zr@semihalf.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Cc: dev@dpdk.org To: zr@semihalf.com, thomas.monjalon@6wind.com, wenzhuo.lu@intel.com, helin.zhang@intel.com, konstantin.ananyev@intel.com, jingjing.wu@intel.com Return-path: Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by dpdk.org (Postfix) with ESMTP id 17D2A58F3 for ; Mon, 27 Jun 2016 12:46:11 +0200 (CEST) In-Reply-To: <1466688410-13826-1-git-send-email-zr@semihalf.com> List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Morning, On 23/06/2016 14:26, zr@semihalf.com wrote: > From: Zyta Szpak > > Version 4 of fixing the assumption of that device registers > are always 32 bits long. rte_eth_dev_get_reg_length and > rte_eth_dev_get_reg_info callbacks did not provide register size > to the app in any way. It is needed to allocate proper number > of bytes before retrieving registers content with > rte_eth_dev_get_reg. This commit remove rte_eth_dev_get_reg_length > callback and adds width parameter to reg_info struct which makes > it possible to call rte_eth_dev_get_reg_info to get attributes > first. The drivers using this callback fill width and length > when call to function made with data=NULL. I think this would read better as a commit message: Removes hard-coded assumption that device registers are always 32 bits wide. The rte_eth_dev_get_reg_length and rte_eth_dev_get_reg_info callbacks did not provide register size to the app in any way, which is needed to allocate correct number of bytes before retrieving registers using rte_eth_dev_get_reg. This commit changes rte_eth_dev_get_reg_info so that it can be used to retrieve both the number of registers and their width, and removes the now-redundant rte_eth_dev_get_reg_length. > -/** > - * Retrieve device registers and register attributes > + * Retrieve device registers and register attributes (nb of regs and reg size) > * > * @param port_id > * The port identifier of the Ethernet device. Need detail regarding how *info->data affects function behaviour. Something along the lines of: /** * Retrieve device registers and register attributes (number of * registers and register size) * * @param port_id * The port identifier of the Ethernet device. * @param info * Pointer to rte_dev_reg_info structure to fill in. If info->data is * NULL the function fills in the width and length fields. If non-NULL * the registers are put into the buffer pointed at by the data field. Program code itself looks good to me. ..Remy