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Date: Tue, 1 Sep 2009 20:18:35 +0200
From: Jiri Pirko <jpirko@...hat.com>
To: Eric Dumazet <eric.dumazet@...il.com>
Cc: "David S. Miller" <davem@...emloft.net>,
Linux Netdev List <netdev@...r.kernel.org>,
Jay Vosburgh <fubar@...ibm.com>
Subject: Re: [PATCH net-next-2.6] bonding: use compare_ether_addr_64bits()
in ALB
Tue, Sep 01, 2009 at 06:31:18PM CEST, eric.dumazet@...il.com wrote:
>We can speedup ether addresses compares using compare_ether_addr_64bits()
>instead of memcmp(). We make sure all operands are at least 8 bytes long and
>16bits aligned (or better, long word aligned if possible)
>
>Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
>---
> drivers/net/bonding/bond_alb.c | 71 ++++++++++++++++---------------
> drivers/net/bonding/bonding.h | 2
> 2 files changed, 38 insertions(+), 35 deletions(-)
>
>diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
>index 2108706..9b5936f 100644
>--- a/drivers/net/bonding/bond_alb.c
>+++ b/drivers/net/bonding/bond_alb.c
>@@ -79,8 +79,15 @@
> */
> #define RLB_PROMISC_TIMEOUT 10*ALB_TIMER_TICKS_PER_SEC
>
>-static const u8 mac_bcast[ETH_ALEN] = {0xff,0xff,0xff,0xff,0xff,0xff};
>-static const u8 mac_v6_allmcast[ETH_ALEN] = {0x33,0x33,0x00,0x00,0x00,0x01};
>+#ifndef __long_aligned
>+#define __long_aligned __attribute__((aligned((sizeof(long)))))
>+#endif
>+static const u8 mac_bcast[ETH_ALEN] __long_aligned = {
>+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
>+};
>+static const u8 mac_v6_allmcast[ETH_ALEN] __long_aligned = {
>+ 0x33, 0x33, 0x00, 0x00, 0x00, 0x01
>+};
> static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC;
>
> #pragma pack(1)
>@@ -460,8 +467,8 @@ static void rlb_clear_slave(struct bonding *bond, struct slave *slave)
>
> if (assigned_slave) {
> rx_hash_table[index].slave = assigned_slave;
>- if (memcmp(rx_hash_table[index].mac_dst,
>- mac_bcast, ETH_ALEN)) {
>+ if (compare_ether_addr_64bits(rx_hash_table[index].mac_dst,
>+ mac_bcast)) {
> bond_info->rx_hashtbl[index].ntt = 1;
> bond_info->rx_ntt = 1;
> /* A slave has been removed from the
>@@ -575,7 +582,7 @@ static void rlb_req_update_slave_clients(struct bonding *bond, struct slave *sla
> client_info = &(bond_info->rx_hashtbl[hash_index]);
>
> if ((client_info->slave == slave) &&
>- memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) {
>+ compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) {
> client_info->ntt = 1;
> ntt = 1;
> }
>@@ -616,9 +623,9 @@ static void rlb_req_update_subnet_clients(struct bonding *bond, __be32 src_ip)
> * unicast mac address.
> */
> if ((client_info->ip_src == src_ip) &&
>- memcmp(client_info->slave->dev->dev_addr,
>- bond->dev->dev_addr, ETH_ALEN) &&
>- memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) {
>+ compare_ether_addr_64bits(client_info->slave->dev->dev_addr,
>+ bond->dev->dev_addr) &&
^^^ I guess you wanted to add some white chars here
Otherwise the patch looks good. I wanted to make a similar a while ago.
Reviewed-by: Jiri Pirko <jpirko@...hat.com>
>+ compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) {
> client_info->ntt = 1;
> bond_info->rx_ntt = 1;
> }
>@@ -645,7 +652,7 @@ static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bon
> if ((client_info->ip_src == arp->ip_src) &&
> (client_info->ip_dst == arp->ip_dst)) {
> /* the entry is already assigned to this client */
>- if (memcmp(arp->mac_dst, mac_bcast, ETH_ALEN)) {
>+ if (compare_ether_addr_64bits(arp->mac_dst, mac_bcast)) {
> /* update mac address from arp */
> memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
> }
>@@ -680,7 +687,7 @@ static struct slave *rlb_choose_channel(struct sk_buff *skb, struct bonding *bon
> memcpy(client_info->mac_dst, arp->mac_dst, ETH_ALEN);
> client_info->slave = assigned_slave;
>
>- if (memcmp(client_info->mac_dst, mac_bcast, ETH_ALEN)) {
>+ if (compare_ether_addr_64bits(client_info->mac_dst, mac_bcast)) {
> client_info->ntt = 1;
> bond->alb_info.rx_ntt = 1;
> } else {
>@@ -1046,21 +1053,18 @@ static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *sla
> int perm_curr_diff;
> int perm_bond_diff;
>
>- perm_curr_diff = memcmp(slave->perm_hwaddr,
>- slave->dev->dev_addr,
>- ETH_ALEN);
>- perm_bond_diff = memcmp(slave->perm_hwaddr,
>- bond->dev->dev_addr,
>- ETH_ALEN);
>+ perm_curr_diff = compare_ether_addr_64bits(slave->perm_hwaddr,
>+ slave->dev->dev_addr);
>+ perm_bond_diff = compare_ether_addr_64bits(slave->perm_hwaddr,
>+ bond->dev->dev_addr);
>
> if (perm_curr_diff && perm_bond_diff) {
> struct slave *tmp_slave;
> int i, found = 0;
>
> bond_for_each_slave(bond, tmp_slave, i) {
>- if (!memcmp(slave->perm_hwaddr,
>- tmp_slave->dev->dev_addr,
>- ETH_ALEN)) {
>+ if (!compare_ether_addr_64bits(slave->perm_hwaddr,
>+ tmp_slave->dev->dev_addr)) {
> found = 1;
> break;
> }
>@@ -1114,10 +1118,10 @@ static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slav
> * check uniqueness of slave's mac address against the other
> * slaves in the bond.
> */
>- if (memcmp(slave->perm_hwaddr, bond->dev->dev_addr, ETH_ALEN)) {
>+ if (compare_ether_addr_64bits(slave->perm_hwaddr, bond->dev->dev_addr)) {
> bond_for_each_slave(bond, tmp_slave1, i) {
>- if (!memcmp(tmp_slave1->dev->dev_addr, slave->dev->dev_addr,
>- ETH_ALEN)) {
>+ if (!compare_ether_addr_64bits(tmp_slave1->dev->dev_addr,
>+ slave->dev->dev_addr)) {
> found = 1;
> break;
> }
>@@ -1140,9 +1144,8 @@ static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slav
> bond_for_each_slave(bond, tmp_slave1, i) {
> found = 0;
> bond_for_each_slave(bond, tmp_slave2, j) {
>- if (!memcmp(tmp_slave1->perm_hwaddr,
>- tmp_slave2->dev->dev_addr,
>- ETH_ALEN)) {
>+ if (!compare_ether_addr_64bits(tmp_slave1->perm_hwaddr,
>+ tmp_slave2->dev->dev_addr)) {
> found = 1;
> break;
> }
>@@ -1157,9 +1160,8 @@ static int alb_handle_addr_collision_on_attach(struct bonding *bond, struct slav
> }
>
> if (!has_bond_addr) {
>- if (!memcmp(tmp_slave1->dev->dev_addr,
>- bond->dev->dev_addr,
>- ETH_ALEN)) {
>+ if (!compare_ether_addr_64bits(tmp_slave1->dev->dev_addr,
>+ bond->dev->dev_addr)) {
>
> has_bond_addr = tmp_slave1;
> }
>@@ -1313,7 +1315,7 @@ int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
> case ETH_P_IP: {
> const struct iphdr *iph = ip_hdr(skb);
>
>- if ((memcmp(eth_data->h_dest, mac_bcast, ETH_ALEN) == 0) ||
>+ if (!compare_ether_addr_64bits(eth_data->h_dest, mac_bcast) ||
> (iph->daddr == ip_bcast) ||
> (iph->protocol == IPPROTO_IGMP)) {
> do_tx_balance = 0;
>@@ -1327,7 +1329,7 @@ int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
> /* IPv6 doesn't really use broadcast mac address, but leave
> * that here just in case.
> */
>- if (memcmp(eth_data->h_dest, mac_bcast, ETH_ALEN) == 0) {
>+ if (!compare_ether_addr_64bits(eth_data->h_dest, mac_bcast)) {
> do_tx_balance = 0;
> break;
> }
>@@ -1335,7 +1337,7 @@ int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
> /* IPv6 uses all-nodes multicast as an equivalent to
> * broadcasts in IPv4.
> */
>- if (memcmp(eth_data->h_dest, mac_v6_allmcast, ETH_ALEN) == 0) {
>+ if (!compare_ether_addr_64bits(eth_data->h_dest, mac_v6_allmcast)) {
> do_tx_balance = 0;
> break;
> }
>@@ -1660,8 +1662,8 @@ void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave
> struct slave *tmp_slave;
> /* find slave that is holding the bond's mac address */
> bond_for_each_slave(bond, tmp_slave, i) {
>- if (!memcmp(tmp_slave->dev->dev_addr,
>- bond->dev->dev_addr, ETH_ALEN)) {
>+ if (!compare_ether_addr_64bits(tmp_slave->dev->dev_addr,
>+ bond->dev->dev_addr)) {
> swap_slave = tmp_slave;
> break;
> }
>@@ -1739,7 +1741,8 @@ int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr)
> swap_slave = NULL;
>
> bond_for_each_slave(bond, slave, i) {
>- if (!memcmp(slave->dev->dev_addr, bond_dev->dev_addr, ETH_ALEN)) {
>+ if (!compare_ether_addr_64bits(slave->dev->dev_addr,
>+ bond_dev->dev_addr)) {
> swap_slave = slave;
> break;
> }
>diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
>index 6290a50..6824771 100644
>--- a/drivers/net/bonding/bonding.h
>+++ b/drivers/net/bonding/bonding.h
>@@ -163,9 +163,9 @@ struct slave {
> u32 original_flags;
> u32 original_mtu;
> u32 link_failure_count;
>+ u8 perm_hwaddr[ETH_ALEN];
> u16 speed;
> u8 duplex;
>- u8 perm_hwaddr[ETH_ALEN];
> struct ad_slave_info ad_info; /* HUGE - better to dynamically alloc */
> struct tlb_slave_info tlb_info;
> };
>--
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