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Commit de063b70 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

bonding: remove packet cloning in recv_probe() 



Cloning all packets in input path have a significant cost.

Use skb_header_pointer()/skb_copy_bits() instead of pskb_may_pull() so
that recv_probe handlers (bond_3ad_lacpdu_recv / bond_arp_rcv /
rlb_arp_recv ) dont touch input skb.

bond_handle_frame() can avoid the skb_clone()/dev_kfree_skb()

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Cc: Jay Vosburgh <fubar@us.ibm.com>
Cc: Andy Gospodarek <andy@greyhouse.net>
Cc: Jiri Bohac <jbohac@suse.cz>
Cc: Nicolas de Pesloüan <nicolas.2p.debian@free.fr>
Cc: Maciej Żenczykowski <maze@google.com>
Signed-off-by: default avatarJay Vosburgh <fubar@us.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 072c0559

drivers/net/bonding/bond_3ad.c

+7 −4
Original line number Diff line number Diff line
@@ -2460,18 +2460,21 @@ int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev) 
	return NETDEV_TX_OK;

}



int bond_3ad_lacpdu_recv(struct sk_buff *skb, struct bonding *bond,

int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,

			 struct slave *slave)

{

	int ret = RX_HANDLER_ANOTHER;

	struct lacpdu *lacpdu, _lacpdu;



	if (skb->protocol != PKT_TYPE_LACPDU)

		return ret;



	if (!pskb_may_pull(skb, sizeof(struct lacpdu)))

	lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);

	if (!lacpdu)

		return ret;



	read_lock(&bond->lock);

	ret = bond_3ad_rx_indication((struct lacpdu *) skb->data, slave, skb->len);

	ret = bond_3ad_rx_indication(lacpdu, slave, skb->len);

	read_unlock(&bond->lock);

	return ret;

}

drivers/net/bonding/bond_3ad.h

+2 −2
Original line number Diff line number Diff line
@@ -274,7 +274,7 @@ void bond_3ad_adapter_duplex_changed(struct slave *slave); 
void bond_3ad_handle_link_change(struct slave *slave, char link);

int  bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info);

int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev);

int bond_3ad_lacpdu_recv(struct sk_buff *skb, struct bonding *bond,

int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,

			 struct slave *slave);

int bond_3ad_set_carrier(struct bonding *bond);

void bond_3ad_update_lacp_rate(struct bonding *bond);

drivers/net/bonding/bond_alb.c

+5 −15
Original line number Diff line number Diff line
@@ -342,27 +342,17 @@ static void rlb_update_entry_from_arp(struct bonding *bond, struct arp_pkt *arp) 
	_unlock_rx_hashtbl_bh(bond);

}



static int rlb_arp_recv(struct sk_buff *skb, struct bonding *bond,

static int rlb_arp_recv(const struct sk_buff *skb, struct bonding *bond,

			struct slave *slave)

{

	struct arp_pkt *arp;

	struct arp_pkt *arp, _arp;



	if (skb->protocol != cpu_to_be16(ETH_P_ARP))

		goto out;



	arp = (struct arp_pkt *) skb->data;

	if (!arp) {

		pr_debug("Packet has no ARP data\n");

	arp = skb_header_pointer(skb, 0, sizeof(_arp), &_arp);

	if (!arp)

		goto out;

	}



	if (!pskb_may_pull(skb, arp_hdr_len(bond->dev)))

		goto out;



	if (skb->len < sizeof(struct arp_pkt)) {

		pr_debug("Packet is too small to be an ARP\n");

		goto out;

	}



	if (arp->op_code == htons(ARPOP_REPLY)) {

		/* update rx hash table for this ARP */

drivers/net/bonding/bond_main.c

+20 −17
Original line number Diff line number Diff line
@@ -1444,7 +1444,7 @@ static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 
	struct sk_buff *skb = *pskb;

	struct slave *slave;

	struct bonding *bond;

	int (*recv_probe)(struct sk_buff *, struct bonding *,

	int (*recv_probe)(const struct sk_buff *, struct bonding *,

			  struct slave *);

	int ret = RX_HANDLER_ANOTHER;
@@ -1462,17 +1462,12 @@ static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 


	recv_probe = ACCESS_ONCE(bond->recv_probe);

	if (recv_probe) {

		struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);



		if (likely(nskb)) {

			ret = recv_probe(nskb, bond, slave);

			dev_kfree_skb(nskb);

		ret = recv_probe(skb, bond, slave);

		if (ret == RX_HANDLER_CONSUMED) {

			consume_skb(skb);

			return ret;

		}

	}

	}



	if (bond_should_deliver_exact_match(skb, slave, bond)) {

		return RX_HANDLER_EXACT;
@@ -2737,25 +2732,31 @@ static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 
	}

}



static int bond_arp_rcv(struct sk_buff *skb, struct bonding *bond,

static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,

			struct slave *slave)

{

	struct arphdr *arp;

	struct arphdr *arp = (struct arphdr *)skb->data;

	unsigned char *arp_ptr;

	__be32 sip, tip;

	int alen;



	if (skb->protocol != __cpu_to_be16(ETH_P_ARP))

		return RX_HANDLER_ANOTHER;



	read_lock(&bond->lock);

	alen = arp_hdr_len(bond->dev);



	pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",

		 bond->dev->name, skb->dev->name);



	if (!pskb_may_pull(skb, arp_hdr_len(bond->dev)))

	if (alen > skb_headlen(skb)) {

		arp = kmalloc(alen, GFP_ATOMIC);

		if (!arp)

			goto out_unlock;

		if (skb_copy_bits(skb, 0, arp, alen) < 0)

			goto out_unlock;

	}



	arp = arp_hdr(skb);

	if (arp->ar_hln != bond->dev->addr_len ||

	    skb->pkt_type == PACKET_OTHERHOST ||

	    skb->pkt_type == PACKET_LOOPBACK ||
@@ -2790,6 +2791,8 @@ static int bond_arp_rcv(struct sk_buff *skb, struct bonding *bond, 


out_unlock:

	read_unlock(&bond->lock);

	if (arp != (struct arphdr *)skb->data)

		kfree(arp);

	return RX_HANDLER_ANOTHER;

}

drivers/net/bonding/bonding.h

+2 −2
Original line number Diff line number Diff line
@@ -218,7 +218,7 @@ struct bonding { 
	struct   slave *primary_slave;

	bool     force_primary;

	s32      slave_cnt; /* never change this value outside the attach/detach wrappers */

	int     (*recv_probe)(struct sk_buff *, struct bonding *,

	int     (*recv_probe)(const struct sk_buff *, struct bonding *,

			      struct slave *);

	rwlock_t lock;

	rwlock_t curr_slave_lock;