From patchwork Fri Oct 11 14:00:42 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tonghao Zhang X-Patchwork-Id: 1175239 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=openvswitch.org (client-ip=140.211.169.12; helo=mail.linuxfoundation.org; envelope-from=ovs-dev-bounces@openvswitch.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="onG8TmsR"; dkim-atps=neutral Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 46qVSF1RZDz9sNx for ; Sat, 12 Oct 2019 01:18:53 +1100 (AEDT) Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id F0E571778; Fri, 11 Oct 2019 14:15:34 +0000 (UTC) X-Original-To: dev@openvswitch.org Delivered-To: ovs-dev@mail.linuxfoundation.org Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 82DE215AE for ; Fri, 11 Oct 2019 14:05:58 +0000 (UTC) X-Greylist: whitelisted by SQLgrey-1.7.6 Received: from mail-pg1-f193.google.com (mail-pg1-f193.google.com [209.85.215.193]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id EB4DD709 for ; Fri, 11 Oct 2019 14:05:56 +0000 (UTC) Received: by mail-pg1-f193.google.com with SMTP id y35so5882659pgl.1 for ; Fri, 11 Oct 2019 07:05:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=k6VOUEZ96dhYIwVnTLLj15fdMju/+qxjbjGxQUjAWK4=; b=onG8TmsRFTtvolXONroAGJudMBxXDc6x1p7275g3o+YXgtBXQGSj+N9lxRNWEIoNMf cnICpJFIIqJijyT6gutT2DC3+CkxMbP9Jbh/Pbfu58/Xm3GghaUkga34RYluVZNVeNjK 98F3HfdZ1HehC3seScGBjxcYp8/HrhzvzYU/bUcGloPFsQ6mV3HvJFumIZx8MIjgFqni MLxCTAZ7w8+uJ7vgrjPIf0FXzoO1IkBVTTXn+9pkUl2lXqG4mQevd46jNQkoQwov+zPB PRbHcv/SLXJMebxYhBEvRFURe+AqP0VKKo99INVKKKU4UO+9UKm2DpdjH8YdVtiC64Gw 6X3Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=k6VOUEZ96dhYIwVnTLLj15fdMju/+qxjbjGxQUjAWK4=; b=sMyOC9nWPRpZ7OJYrFVRjrI/TqNMyTXQVrPl2jVI1xKDvHlAcfSH+9bzvaXjG4Xx0L 8VesYArXjQJEZn3EngyCoywDgpMp9F86J/O0gERhA+D9e9ROZ7o5adrgCa+ZPq2vkWBA u38grzjJ69tFoekdUGYG7v5SfD/Y0EK2CaqzP4Pu62pbRq5fd34l/G6NRiVD5kgma+n0 SIAkVdk9YUj8GrTguiU0HPPlbeylMoloYGZaSMjjRDdExz1W5OFs2PkT8xKWMfFDiouU Bw6/RVHbL+23VfRR/qePBu4Qclvh/nOUC3GwNCvieXSuFZEbz7uqJQgBZt56RKEPAMVs HA3w== X-Gm-Message-State: APjAAAXOot7Jd/tx6cVAH0EWyPa/Cbbia1OIcnSZhVrq42iAgLd2DhFG a4sgm3lEvXRQGWkFt8pshoA3hIg3 X-Google-Smtp-Source: APXvYqwLr6oNOol7UJgKIF36hylQtr2Q/xV3ZL+8JSwQpFFVCrkWxPSc2i/AfqNIjA7vUsOTWpCoIA== X-Received: by 2002:a63:e00e:: with SMTP id e14mr17345820pgh.146.1570802755815; Fri, 11 Oct 2019 07:05:55 -0700 (PDT) Received: from local.opencloud.tech.localdomain ([219.143.130.165]) by smtp.gmail.com with ESMTPSA id p190sm11499392pfb.160.2019.10.11.07.05.51 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 11 Oct 2019 07:05:55 -0700 (PDT) From: xiangxia.m.yue@gmail.com To: gvrose8192@gmail.com, pshelar@ovn.org Date: Fri, 11 Oct 2019 22:00:42 +0800 Message-Id: <1570802447-8019-6-git-send-email-xiangxia.m.yue@gmail.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1570802447-8019-1-git-send-email-xiangxia.m.yue@gmail.com> References: <1570802447-8019-1-git-send-email-xiangxia.m.yue@gmail.com> X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, FREEMAIL_FROM, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org Cc: dev@openvswitch.org, netdev@vger.kernel.org Subject: [ovs-dev] [PATCH net-next v3 05/10] net: openvswitch: optimize flow-mask looking up X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: ovs-dev-bounces@openvswitch.org Errors-To: ovs-dev-bounces@openvswitch.org From: Tonghao Zhang The full looking up on flow table traverses all mask array. If mask-array is too large, the number of invalid flow-mask increase, performance will be drop. This patch optimizes mask-array operation: * Inserting, insert it [ma->count- 1] directly. * Removing, only change last and current mask point, and free current mask. * Looking up, full looking up will break if mask is NULL. The function which changes or gets *count* of struct mask_array, is protected by ovs_lock, but flow_lookup (not protected) should use *max* of struct mask_array. Functions protected by ovs_lock: * tbl_mask_array_del_mask * tbl_mask_array_add_mask * flow_mask_find * ovs_flow_tbl_lookup_exact * ovs_flow_tbl_num_masks Signed-off-by: Tonghao Zhang --- net/openvswitch/flow_table.c | 114 ++++++++++++++++++++++--------------------- 1 file changed, 58 insertions(+), 56 deletions(-) diff --git a/net/openvswitch/flow_table.c b/net/openvswitch/flow_table.c index 4c82960..1b99f8e 100644 --- a/net/openvswitch/flow_table.c +++ b/net/openvswitch/flow_table.c @@ -198,10 +198,8 @@ static int tbl_mask_array_realloc(struct flow_table *tbl, int size) if (old) { int i; - for (i = 0; i < old->max; i++) { - if (ovsl_dereference(old->masks[i])) - new->masks[new->count++] = old->masks[i]; - } + for (i = 0; i < old->count; i++) + new->masks[new->count++] = old->masks[i]; } rcu_assign_pointer(tbl->mask_array, new); @@ -538,7 +536,7 @@ static struct sw_flow *flow_lookup(struct flow_table *tbl, mask = rcu_dereference_ovsl(ma->masks[i]); if (!mask) - continue; + break; flow = masked_flow_lookup(ti, key, mask, n_mask_hit); if (flow) { /* Found */ @@ -632,15 +630,13 @@ struct sw_flow *ovs_flow_tbl_lookup_exact(struct flow_table *tbl, int i; /* Always called under ovs-mutex. */ - for (i = 0; i < ma->max; i++) { + for (i = 0; i < ma->count; i++) { struct table_instance *ti = rcu_dereference_ovsl(tbl->ti); u32 __always_unused n_mask_hit; struct sw_flow_mask *mask; struct sw_flow *flow; mask = ovsl_dereference(ma->masks[i]); - if (!mask) - continue; flow = masked_flow_lookup(ti, match->key, mask, &n_mask_hit); if (flow && ovs_identifier_is_key(&flow->id) && @@ -704,21 +700,34 @@ static struct table_instance *table_instance_expand(struct table_instance *ti, return table_instance_rehash(ti, ti->n_buckets * 2, ufid); } -static void tbl_mask_array_delete_mask(struct mask_array *ma, - struct sw_flow_mask *mask) +static void tbl_mask_array_del_mask(struct flow_table *tbl, + struct sw_flow_mask *mask) { + struct mask_array *ma = ovsl_dereference(tbl->mask_array); int i; /* Remove the deleted mask pointers from the array */ - for (i = 0; i < ma->max; i++) { - if (mask == ovsl_dereference(ma->masks[i])) { - RCU_INIT_POINTER(ma->masks[i], NULL); - ma->count--; - kfree_rcu(mask, rcu); - return; - } + for (i = 0; i < ma->count; i++) { + if (mask == ovsl_dereference(ma->masks[i])) + goto found; } + BUG(); + return; + +found: + ma->count--; + smp_wmb(); + + rcu_assign_pointer(ma->masks[i], ma->masks[ma->count]); + RCU_INIT_POINTER(ma->masks[ma->count], NULL); + + kfree_rcu(mask, rcu); + + /* Shrink the mask array if necessary. */ + if (ma->max >= (MASK_ARRAY_SIZE_MIN * 2) && + ma->count <= (ma->max / 3)) + tbl_mask_array_realloc(tbl, ma->max / 2); } /* Remove 'mask' from the mask list, if it is not needed any more. */ @@ -732,17 +741,8 @@ static void flow_mask_remove(struct flow_table *tbl, struct sw_flow_mask *mask) BUG_ON(!mask->ref_count); mask->ref_count--; - if (!mask->ref_count) { - struct mask_array *ma; - - ma = ovsl_dereference(tbl->mask_array); - tbl_mask_array_delete_mask(ma, mask); - - /* Shrink the mask array if necessary. */ - if (ma->max >= (MASK_ARRAY_SIZE_MIN * 2) && - ma->count <= (ma->max / 3)) - tbl_mask_array_realloc(tbl, ma->max / 2); - } + if (!mask->ref_count) + tbl_mask_array_del_mask(tbl, mask); } } @@ -795,17 +795,42 @@ static struct sw_flow_mask *flow_mask_find(const struct flow_table *tbl, int i; ma = ovsl_dereference(tbl->mask_array); - for (i = 0; i < ma->max; i++) { + for (i = 0; i < ma->count; i++) { struct sw_flow_mask *t; t = ovsl_dereference(ma->masks[i]); - if (t && mask_equal(mask, t)) + if (mask_equal(mask, t)) return t; } return NULL; } +static int tbl_mask_array_add_mask(struct flow_table *tbl, + struct sw_flow_mask *new) +{ + struct mask_array *ma = ovsl_dereference(tbl->mask_array); + int err; + + if (ma->count >= ma->max) { + err = tbl_mask_array_realloc(tbl, ma->max + + MASK_ARRAY_SIZE_MIN); + if (err) + return err; + + ma = ovsl_dereference(tbl->mask_array); + } + + BUG_ON(ovsl_dereference(ma->masks[ma->count])); + + rcu_assign_pointer(ma->masks[ma->count], new); + + smp_wmb(); + ma->count++; + + return 0; +} + /* Add 'mask' into the mask list, if it is not already there. */ static int flow_mask_insert(struct flow_table *tbl, struct sw_flow *flow, const struct sw_flow_mask *new) @@ -814,9 +839,6 @@ static int flow_mask_insert(struct flow_table *tbl, struct sw_flow *flow, mask = flow_mask_find(tbl, new); if (!mask) { - struct mask_array *ma; - int i; - /* Allocate a new mask if none exsits. */ mask = mask_alloc(); if (!mask) @@ -825,29 +847,9 @@ static int flow_mask_insert(struct flow_table *tbl, struct sw_flow *flow, mask->range = new->range; /* Add mask to mask-list. */ - ma = ovsl_dereference(tbl->mask_array); - if (ma->count >= ma->max) { - int err; - - err = tbl_mask_array_realloc(tbl, ma->max + - MASK_ARRAY_SIZE_MIN); - if (err) { - kfree(mask); - return err; - } - - ma = ovsl_dereference(tbl->mask_array); - } - - for (i = 0; i < ma->max; i++) { - const struct sw_flow_mask *t; - - t = ovsl_dereference(ma->masks[i]); - if (!t) { - rcu_assign_pointer(ma->masks[i], mask); - ma->count++; - break; - } + if (tbl_mask_array_add_mask(tbl, mask)) { + kfree(mask); + return -ENOMEM; } } else { BUG_ON(!mask->ref_count);