From patchwork Tue Jan 19 01:09:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarod Wilson X-Patchwork-Id: 12028491 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 026F6C433DB for ; Tue, 19 Jan 2021 01:11:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C1742230FA for ; Tue, 19 Jan 2021 01:11:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391322AbhASBLU (ORCPT ); Mon, 18 Jan 2021 20:11:20 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:59420 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387580AbhASBLS (ORCPT ); Mon, 18 Jan 2021 20:11:18 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1611018589; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=yPkdZv9sJkMoRKsQsaOcsuMIzY7Hh3S4SSYUQrt8Kts=; b=Y1IKcmN58s5vtp5S9jU+zQ5EW3yt/vEjs17i9s4zyx3w3jB+Nn9IdKYFRXZ7WA2g0L+GDo kDmwUdob3T6ABMbjX3QNlMeK30OSCuDSHC2t4wf1XhpOBRt5ustecKHZN2BLxMikYJujoL 3Ms4cOx4W8neC399UcOckT1i0FrIWWM= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-558-FAyTUa-rNke-WCk16r9WQA-1; Mon, 18 Jan 2021 20:09:47 -0500 X-MC-Unique: FAyTUa-rNke-WCk16r9WQA-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E886A806661; Tue, 19 Jan 2021 01:09:45 +0000 (UTC) Received: from f33vm.wilsonet.com.wilsonet.com (dhcp-17-185.bos.redhat.com [10.18.17.185]) by smtp.corp.redhat.com (Postfix) with ESMTP id E5C2271C98; Tue, 19 Jan 2021 01:09:41 +0000 (UTC) From: Jarod Wilson To: linux-kernel@vger.kernel.org Cc: Jarod Wilson , Jay Vosburgh , Veaceslav Falico , Andy Gospodarek , "David S. Miller" , Jakub Kicinski , Thomas Davis , netdev@vger.kernel.org Subject: [PATCH net-next v4] bonding: add a vlan+srcmac tx hashing option Date: Mon, 18 Jan 2021 20:09:27 -0500 Message-Id: <20210119010927.1191922-1-jarod@redhat.com> In-Reply-To: <20210115192103.1179450-1-jarod@redhat.com> References: <20210115192103.1179450-1-jarod@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org This comes from an end-user request, where they're running multiple VMs on hosts with bonded interfaces connected to some interest switch topologies, where 802.3ad isn't an option. They're currently running a proprietary solution that effectively achieves load-balancing of VMs and bandwidth utilization improvements with a similar form of transmission algorithm. Basically, each VM has it's own vlan, so it always sends its traffic out the same interface, unless that interface fails. Traffic gets split between the interfaces, maintaining a consistent path, with failover still available if an interface goes down. Unlike bond_eth_hash(), this hash function is using the full source MAC address instead of just the last byte, as there are so few components to the hash, and in the no-vlan case, we would be returning just the last byte of the source MAC as the hash value. It's entirely possible to have two NICs in a bond with the same last byte of their MAC, but not the same MAC, so this adjustment should guarantee distinct hashes in all cases. This has been rudimetarily tested to provide similar results to the proprietary solution it is aiming to replace. A patch for iproute2 is also posted, to properly support the new mode there as well. Cc: Jay Vosburgh Cc: Veaceslav Falico Cc: Andy Gospodarek Cc: "David S. Miller" Cc: Jakub Kicinski Cc: Thomas Davis Cc: netdev@vger.kernel.org Signed-off-by: Jarod Wilson --- v2: verified netlink interfaces working, added Documentation, changed tx hash mode name to vlan+mac for consistency and clarity. v3: drop inline from hash function, use full source MAC, not just the last byte, expand explanation in patch description, extend hash name to vlan+srcmac. v4: fix documentation issues pointed out by David Ahern Documentation/networking/bonding.rst | 13 +++++++++++ drivers/net/bonding/bond_main.c | 34 ++++++++++++++++++++++++++-- drivers/net/bonding/bond_options.c | 13 ++++++----- include/linux/netdevice.h | 1 + include/uapi/linux/if_bonding.h | 1 + 5 files changed, 54 insertions(+), 8 deletions(-) diff --git a/Documentation/networking/bonding.rst b/Documentation/networking/bonding.rst index adc314639085..36562dcd3e1e 100644 --- a/Documentation/networking/bonding.rst +++ b/Documentation/networking/bonding.rst @@ -951,6 +951,19 @@ xmit_hash_policy packets will be distributed according to the encapsulated flows. + vlan+srcmac + + This policy uses a very rudimentary vlan ID and source mac + hash to load-balance traffic per-vlan, with failover + should one leg fail. The intended use case is for a bond + shared by multiple virtual machines, all configured to + use their own vlan, to give lacp-like functionality + without requiring lacp-capable switching hardware. + + The formula for the hash is simply + + hash = (vlan ID) XOR (source MAC vendor) XOR (source MAC dev) + The default value is layer2. This option was added in bonding version 2.6.3. In earlier versions of bonding, this parameter does not exist, and the layer2 policy is the only policy. The diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 5fe5232cc3f3..d4bc4d4e953b 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -164,7 +164,7 @@ module_param(xmit_hash_policy, charp, 0); MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; " "0 for layer 2 (default), 1 for layer 3+4, " "2 for layer 2+3, 3 for encap layer 2+3, " - "4 for encap layer 3+4"); + "4 for encap layer 3+4, 5 for vlan+srcmac"); module_param(arp_interval, int, 0); MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds"); module_param_array(arp_ip_target, charp, NULL, 0); @@ -1434,6 +1434,8 @@ static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond, return NETDEV_LAG_HASH_E23; case BOND_XMIT_POLICY_ENCAP34: return NETDEV_LAG_HASH_E34; + case BOND_XMIT_POLICY_VLAN_SRCMAC: + return NETDEV_LAG_HASH_VLAN_SRCMAC; default: return NETDEV_LAG_HASH_UNKNOWN; } @@ -3494,6 +3496,27 @@ static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk, return true; } +static u32 bond_vlan_srcmac_hash(struct sk_buff *skb) +{ + struct ethhdr *mac_hdr = (struct ethhdr *)skb_mac_header(skb); + u32 srcmac_vendor = 0, srcmac_dev = 0; + u16 vlan; + int i; + + for (i = 0; i < 3; i++) + srcmac_vendor = (srcmac_vendor << 8) | mac_hdr->h_source[i]; + + for (i = 3; i < ETH_ALEN; i++) + srcmac_dev = (srcmac_dev << 8) | mac_hdr->h_source[i]; + + if (!skb_vlan_tag_present(skb)) + return srcmac_vendor ^ srcmac_dev; + + vlan = skb_vlan_tag_get(skb); + + return vlan ^ srcmac_vendor ^ srcmac_dev; +} + /* Extract the appropriate headers based on bond's xmit policy */ static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, struct flow_keys *fk) @@ -3501,10 +3524,14 @@ static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34; int noff, proto = -1; - if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23) { + switch (bond->params.xmit_policy) { + case BOND_XMIT_POLICY_ENCAP23: + case BOND_XMIT_POLICY_ENCAP34: memset(fk, 0, sizeof(*fk)); return __skb_flow_dissect(NULL, skb, &flow_keys_bonding, fk, NULL, 0, 0, 0, 0); + default: + break; } fk->ports.ports = 0; @@ -3556,6 +3583,9 @@ u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb) skb->l4_hash) return skb->hash; + if (bond->params.xmit_policy == BOND_XMIT_POLICY_VLAN_SRCMAC) + return bond_vlan_srcmac_hash(skb); + if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 || !bond_flow_dissect(bond, skb, &flow)) return bond_eth_hash(skb); diff --git a/drivers/net/bonding/bond_options.c b/drivers/net/bonding/bond_options.c index a4e4e15f574d..c69400c5bf07 100644 --- a/drivers/net/bonding/bond_options.c +++ b/drivers/net/bonding/bond_options.c @@ -96,12 +96,13 @@ static const struct bond_opt_value bond_pps_tbl[] = { }; static const struct bond_opt_value bond_xmit_hashtype_tbl[] = { - { "layer2", BOND_XMIT_POLICY_LAYER2, BOND_VALFLAG_DEFAULT}, - { "layer3+4", BOND_XMIT_POLICY_LAYER34, 0}, - { "layer2+3", BOND_XMIT_POLICY_LAYER23, 0}, - { "encap2+3", BOND_XMIT_POLICY_ENCAP23, 0}, - { "encap3+4", BOND_XMIT_POLICY_ENCAP34, 0}, - { NULL, -1, 0}, + { "layer2", BOND_XMIT_POLICY_LAYER2, BOND_VALFLAG_DEFAULT}, + { "layer3+4", BOND_XMIT_POLICY_LAYER34, 0}, + { "layer2+3", BOND_XMIT_POLICY_LAYER23, 0}, + { "encap2+3", BOND_XMIT_POLICY_ENCAP23, 0}, + { "encap3+4", BOND_XMIT_POLICY_ENCAP34, 0}, + { "vlan+srcmac", BOND_XMIT_POLICY_VLAN_SRCMAC, 0}, + { NULL, -1, 0}, }; static const struct bond_opt_value bond_arp_validate_tbl[] = { diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 5b949076ed23..a94ce80a2fe1 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -2615,6 +2615,7 @@ enum netdev_lag_hash { NETDEV_LAG_HASH_L23, NETDEV_LAG_HASH_E23, NETDEV_LAG_HASH_E34, + NETDEV_LAG_HASH_VLAN_SRCMAC, NETDEV_LAG_HASH_UNKNOWN, }; diff --git a/include/uapi/linux/if_bonding.h b/include/uapi/linux/if_bonding.h index 45f3750aa861..e8eb4ad03cf1 100644 --- a/include/uapi/linux/if_bonding.h +++ b/include/uapi/linux/if_bonding.h @@ -94,6 +94,7 @@ #define BOND_XMIT_POLICY_LAYER23 2 /* layer 2+3 (IP ^ MAC) */ #define BOND_XMIT_POLICY_ENCAP23 3 /* encapsulated layer 2+3 */ #define BOND_XMIT_POLICY_ENCAP34 4 /* encapsulated layer 3+4 */ +#define BOND_XMIT_POLICY_VLAN_SRCMAC 5 /* vlan + source MAC */ /* 802.3ad port state definitions (43.4.2.2 in the 802.3ad standard) */ #define LACP_STATE_LACP_ACTIVITY 0x1