From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zhe Tao Subject: [PATCH v2] lpm: fix extended flag check when adding a "depth small" entry Date: Thu, 30 Jul 2015 11:19:02 +0800 Message-ID: <1438226342-13113-1-git-send-email-zhe.tao@intel.com> References: <1438074846-13874-1-git-send-email-zhe.tao@intel.com> To: dev@dpdk.org Return-path: Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by dpdk.org (Postfix) with ESMTP id 47C5BC446 for ; Thu, 30 Jul 2015 05:19:22 +0200 (CEST) In-Reply-To: <1438074846-13874-1-git-send-email-zhe.tao@intel.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" When adding a "depth small" entry, if its extended flag is not set and its depth is smaller than the one in the tbl24, nothing should be done otherwise will operate on the wrong memory area. Signed-off-by: Zhe Tao --- PATCH v2: Edit to keep line size below 80 characters PATCH v1: Fix extended flag check when adding a "depth small" entry lib/librte_lpm/rte_lpm.c | 54 +++++++++++++++++++++++++++--------------------- 1 file changed, 30 insertions(+), 24 deletions(-) diff --git a/lib/librte_lpm/rte_lpm.c b/lib/librte_lpm/rte_lpm.c index de05307..163ba3c 100644 --- a/lib/librte_lpm/rte_lpm.c +++ b/lib/librte_lpm/rte_lpm.c @@ -442,35 +442,41 @@ add_depth_small(struct rte_lpm *lpm, uint32_t ip, uint8_t depth, }; /* Setting tbl24 entry in one go to avoid race - * conditions */ + * conditions + */ lpm->tbl24[i] = new_tbl24_entry; continue; } - /* If tbl24 entry is valid and extended calculate the index - * into tbl8. */ - tbl8_index = lpm->tbl24[i].tbl8_gindex * - RTE_LPM_TBL8_GROUP_NUM_ENTRIES; - tbl8_group_end = tbl8_index + RTE_LPM_TBL8_GROUP_NUM_ENTRIES; - - for (j = tbl8_index; j < tbl8_group_end; j++) { - if (!lpm->tbl8[j].valid || - lpm->tbl8[j].depth <= depth) { - struct rte_lpm_tbl8_entry new_tbl8_entry = { - .valid = VALID, - .valid_group = VALID, - .depth = depth, - .next_hop = next_hop, - }; - - /* - * Setting tbl8 entry in one go to avoid race - * conditions - */ - lpm->tbl8[j] = new_tbl8_entry; - - continue; + if (lpm->tbl24[i].ext_entry == 1) { + /* If tbl24 entry is valid and extended calculate the + * index into tbl8. + */ + tbl8_index = lpm->tbl24[i].tbl8_gindex * + RTE_LPM_TBL8_GROUP_NUM_ENTRIES; + tbl8_group_end = tbl8_index + + RTE_LPM_TBL8_GROUP_NUM_ENTRIES; + + for (j = tbl8_index; j < tbl8_group_end; j++) { + if (!lpm->tbl8[j].valid || + lpm->tbl8[j].depth <= depth) { + struct rte_lpm_tbl8_entry + new_tbl8_entry = { + .valid = VALID, + .valid_group = VALID, + .depth = depth, + .next_hop = next_hop, + }; + + /* + * Setting tbl8 entry in one go to avoid + * race conditions + */ + lpm->tbl8[j] = new_tbl8_entry; + + continue; + } } } } -- 1.9.3