From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tadeusz Struk Subject: [PATCH v4 1/3] lib/scatterlist: Add sg_len helper Date: Thu, 01 Oct 2015 13:28:51 -0700 Message-ID: <20151001202850.7193.77248.stgit@tstruk-mobl1> References: <20151001202845.7193.51602.stgit@tstruk-mobl1> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: linux-crypto@vger.kernel.org, qat-linux@intel.com, tadeusz.struk@intel.com To: herbert@gondor.apana.org.au Return-path: Received: from mga09.intel.com ([134.134.136.24]:22161 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753419AbbJAUa4 (ORCPT ); Thu, 1 Oct 2015 16:30:56 -0400 In-Reply-To: <20151001202845.7193.51602.stgit@tstruk-mobl1> Sender: linux-crypto-owner@vger.kernel.org List-ID: Add sg_len function which returns the total number of bytes in sg. Signed-off-by: Tadeusz Struk --- include/linux/scatterlist.h | 1 + lib/scatterlist.c | 20 ++++++++++++++++++++ 2 files changed, 21 insertions(+) diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h index 556ec1e..dba8f78 100644 --- a/include/linux/scatterlist.h +++ b/include/linux/scatterlist.h @@ -242,6 +242,7 @@ static inline void *sg_virt(struct scatterlist *sg) } int sg_nents(struct scatterlist *sg); +unsigned int sg_len(struct scatterlist *sg); int sg_nents_for_len(struct scatterlist *sg, u64 len); struct scatterlist *sg_next(struct scatterlist *); struct scatterlist *sg_last(struct scatterlist *s, unsigned int); diff --git a/lib/scatterlist.c b/lib/scatterlist.c index bafa993..2ae4c53 100644 --- a/lib/scatterlist.c +++ b/lib/scatterlist.c @@ -57,6 +57,26 @@ int sg_nents(struct scatterlist *sg) EXPORT_SYMBOL(sg_nents); /** + * sg_len - return total size of bytes in the scatterlist + * @sg: The scatterlist + * + * Description: + * Allows to know the total size of bytes in an sg, taking into account + * chaining as well. + * + * Returns: total size of bytes in the scatterlist + **/ +unsigned int sg_len(struct scatterlist *sg) +{ + unsigned int len; + + for (len = 0; sg; sg = sg_next(sg)) + len += sg->length; + return len; +} +EXPORT_SYMBOL(sg_len); + +/** * sg_nents_for_len - return total count of entries in scatterlist * needed to satisfy the supplied length * @sg: The scatterlist