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Miller" , Jakub Kicinski , Thomas Davis , netdev@vger.kernel.org References: <20210518210849.1673577-1-jarod@redhat.com> <20210521132756.1811620-1-jarod@redhat.com> <20210521132756.1811620-2-jarod@redhat.com> From: Nikolay Aleksandrov Message-ID: Date: Fri, 21 May 2021 16:39:20 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 In-Reply-To: <20210521132756.1811620-2-jarod@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [213.179.129.39] X-ClientProxiedBy: ZR0P278CA0134.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:40::13) To DM4PR12MB5278.namprd12.prod.outlook.com (2603:10b6:5:39e::17) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [10.21.241.64] (213.179.129.39) by ZR0P278CA0134.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:40::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4150.23 via Frontend Transport; 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The previously added vlan+srcmac hash doesn't work as well for a > VM with a single MAC and multiple vlans -- these types of setups path > traffic more efficiently if the load is split by source mac alone. Enable > this by way of an extra module parameter, rather than adding yet another > hashing method in the tx fast path. > > Cc: Jay Vosburgh > Cc: Veaceslav Falico > Cc: Andy Gospodarek > Cc: "David S. Miller" > Cc: Jakub Kicinski > Cc: Thomas Davis > Cc: Nikolay Aleksandrov > Cc: netdev@vger.kernel.org > Signed-off-by: Jarod Wilson > --- > Documentation/networking/bonding.rst | 13 +++++++++++++ > drivers/net/bonding/bond_main.c | 18 ++++++++++++------ > 2 files changed, 25 insertions(+), 6 deletions(-) > Hi, You seem to be missing netlink support for the new option. Code-wise the rest seems fine, my personal preference is still to make a configurable hash option and perhaps default to srcmac+vlan, i.e. it can be aliased with this hash option. I don't mind either way, but please add netlink support if it will be a new option as it's the preferred way for configuring. Thanks, Nik > diff --git a/Documentation/networking/bonding.rst b/Documentation/networking/bonding.rst > index 62f2aab8eaec..767dbb49018b 100644 > --- a/Documentation/networking/bonding.rst > +++ b/Documentation/networking/bonding.rst > @@ -707,6 +707,13 @@ mode > swapped with the new curr_active_slave that was > chosen. > > +novlan_srcmac > + > + When using the vlan+srcmac xmit_hash_policy, there may be cases where > + omitting the vlan from the hash is beneficial. This can be done with > + an extra module parameter here. The default value is 0 to include > + vlan ID in the transmit hash. > + > num_grat_arp, > num_unsol_na > > @@ -964,6 +971,12 @@ xmit_hash_policy > > hash = (vlan ID) XOR (source MAC vendor) XOR (source MAC dev) > > + Optionally, if the module parameter novlan_srcmac=1 is set, > + the vlan ID is omitted from the hash and only the source MAC > + address is used, reducing the hash to > + > + hash = (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 20bbda1b36e1..32785e9d0295 100644 > --- a/drivers/net/bonding/bond_main.c > +++ b/drivers/net/bonding/bond_main.c > @@ -107,6 +107,7 @@ static char *lacp_rate; > static int min_links; > static char *ad_select; > static char *xmit_hash_policy; > +static int novlan_srcmac; > static int arp_interval; > static char *arp_ip_target[BOND_MAX_ARP_TARGETS]; > static char *arp_validate; > @@ -168,6 +169,9 @@ MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3 > "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, 5 for vlan+srcmac"); > +module_param(novlan_srcmac, int, 0); > +MODULE_PARM_DESC(novlan_srcmac, "include vlan ID in vlan+srcmac xmit_hash_policy or not; " > + "0 to include it (default), 1 to exclude it"); > module_param(arp_interval, int, 0); > MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds"); > module_param_array(arp_ip_target, charp, NULL, 0); > @@ -3523,9 +3527,9 @@ static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk, > > static u32 bond_vlan_srcmac_hash(struct sk_buff *skb) > { > - struct ethhdr *mac_hdr = (struct ethhdr *)skb_mac_header(skb); > + struct ethhdr *mac_hdr = eth_hdr(skb); > u32 srcmac_vendor = 0, srcmac_dev = 0; > - u16 vlan; > + u32 hash; > int i; > > for (i = 0; i < 3; i++) > @@ -3534,12 +3538,14 @@ static u32 bond_vlan_srcmac_hash(struct sk_buff *skb) > 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; > + hash = srcmac_vendor ^ srcmac_dev; > + > + if (novlan_srcmac || !skb_vlan_tag_present(skb)) > + return hash; > > - vlan = skb_vlan_tag_get(skb); > + hash ^= skb_vlan_tag_get(skb); > > - return vlan ^ srcmac_vendor ^ srcmac_dev; > + return hash; > } > > /* Extract the appropriate headers based on bond's xmit policy */ >