From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from proxy.6wind.com (host.76.145.23.62.rev.coltfrance.com [62.23.145.76]) by dpdk.org (Postfix) with ESMTP id 72F0F326C for ; Thu, 6 Apr 2017 16:15:26 +0200 (CEST) Received: from glumotte.dev.6wind.com (unknown [10.16.0.195]) by proxy.6wind.com (Postfix) with ESMTP id 3570423EFA for ; Thu, 6 Apr 2017 16:15:21 +0200 (CEST) From: Olivier Matz To: dev@dpdk.org Date: Thu, 6 Apr 2017 16:15:36 +0200 Message-Id: <20170406141536.14980-1-olivier.matz@6wind.com> X-Mailer: git-send-email 2.11.0 Subject: [dpdk-dev] [PATCH] common: introduce an integer log2 function X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 06 Apr 2017 14:15:26 -0000 At some places, the log2() function is used despite this function works on float. This introduces a dependency to the math lib but most of the time it is not required because we want an integer log2. Add a new helper to do this job and fix 2 drivers. Signed-off-by: Olivier Matz --- drivers/net/nfp/nfp_net.c | 6 ++---- lib/librte_eal/common/include/rte_common.h | 17 +++++++++++++++++ mk/rte.app.mk | 2 +- 3 files changed, 20 insertions(+), 5 deletions(-) diff --git a/drivers/net/nfp/nfp_net.c b/drivers/net/nfp/nfp_net.c index a1ad97ad5..0e6a729ef 100644 --- a/drivers/net/nfp/nfp_net.c +++ b/drivers/net/nfp/nfp_net.c @@ -39,8 +39,6 @@ * Netronome vNIC DPDK Poll-Mode Driver: Main entry point */ -#include - #include #include #include @@ -1493,7 +1491,7 @@ nfp_net_rx_queue_setup(struct rte_eth_dev *dev, * of descriptors in log2 format */ nn_cfg_writeq(hw, NFP_NET_CFG_RXR_ADDR(queue_idx), rxq->dma); - nn_cfg_writeb(hw, NFP_NET_CFG_RXR_SZ(queue_idx), log2(nb_desc)); + nn_cfg_writeb(hw, NFP_NET_CFG_RXR_SZ(queue_idx), rte_log2_u32(nb_desc)); return 0; } @@ -1647,7 +1645,7 @@ nfp_net_tx_queue_setup(struct rte_eth_dev *dev, uint16_t queue_idx, * of descriptors in log2 format */ nn_cfg_writeq(hw, NFP_NET_CFG_TXR_ADDR(queue_idx), txq->dma); - nn_cfg_writeb(hw, NFP_NET_CFG_TXR_SZ(queue_idx), log2(nb_desc)); + nn_cfg_writeb(hw, NFP_NET_CFG_TXR_SZ(queue_idx), rte_log2_u32(nb_desc)); return 0; } diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h index e057f6e21..eea0054c1 100644 --- a/lib/librte_eal/common/include/rte_common.h +++ b/lib/librte_eal/common/include/rte_common.h @@ -326,6 +326,23 @@ rte_bsf32(uint32_t v) return __builtin_ctz(v); } +/** + * Return the rounded-up log2 of a integer. + * + * @param v + * The input parameter. + * @return + * The rounded-up log2 of the input, or 0 if the input is 0. + */ +static inline uint32_t +rte_log2_u32(uint32_t v) +{ + if (v == 0) + return 0; + v = rte_align32pow2(v); + return rte_bsf32(v); +} + #ifndef offsetof /** Return the offset of a field in a structure. */ #define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER) diff --git a/mk/rte.app.mk b/mk/rte.app.mk index 4c659e971..2fcd388e6 100644 --- a/mk/rte.app.mk +++ b/mk/rte.app.mk @@ -125,7 +125,7 @@ endif _LDLIBS-$(CONFIG_RTE_LIBRTE_LIO_PMD) += -lrte_pmd_lio _LDLIBS-$(CONFIG_RTE_LIBRTE_MLX4_PMD) += -lrte_pmd_mlx4 -libverbs _LDLIBS-$(CONFIG_RTE_LIBRTE_MLX5_PMD) += -lrte_pmd_mlx5 -libverbs -_LDLIBS-$(CONFIG_RTE_LIBRTE_NFP_PMD) += -lrte_pmd_nfp -lm +_LDLIBS-$(CONFIG_RTE_LIBRTE_NFP_PMD) += -lrte_pmd_nfp _LDLIBS-$(CONFIG_RTE_LIBRTE_PMD_NULL) += -lrte_pmd_null _LDLIBS-$(CONFIG_RTE_LIBRTE_PMD_PCAP) += -lrte_pmd_pcap -lpcap _LDLIBS-$(CONFIG_RTE_LIBRTE_QEDE_PMD) += -lrte_pmd_qede -- 2.11.0