Commit c69de58b authored by William Tu's avatar William Tu Committed by David S. Miller
Browse files

net: erspan: use bitfield instead of mask and offset 



Originally the erspan fields are defined as a group into a __be16 field,
and use mask and offset to access each field.  This is more costly due to
calling ntohs/htons.  The patch changes it to use bitfields.

Signed-off-by: default avatarWilliam Tu <u9012063@gmail.com>
Acked-by: default avatarPravin B Shelar <pshelar@ovn.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b89d06ce

include/net/erspan.h

+94 −33
Original line number Diff line number Diff line
@@ -65,16 +65,30 @@ 
#define GRA_MASK	0x0006

#define O_MASK		0x0001



#define HWID_OFFSET    4

#define DIR_OFFSET     3



/* ERSPAN version 2 metadata header */

struct erspan_md2 {

	__be32 timestamp;

	__be16 sgt;	/* security group tag */

	__be16 flags;

#define P_OFFSET	15

#define FT_OFFSET	10

#define HWID_OFFSET	4

#define DIR_OFFSET	3

#define GRA_OFFSET	1

#if defined(__LITTLE_ENDIAN_BITFIELD)

	__u8	hwid_upper:2,

		ft:5,

		p:1;

	__u8	o:1,

		gra:2,

		dir:1,

		hwid:4;

#elif defined(__BIG_ENDIAN_BITFIELD)

	__u8	p:1,

		ft:5,

		hwid_upper:2;

	__u8	hwid:4,

		dir:1,

		gra:2,

		o:1;

#endif

};



enum erspan_encap_type {
@@ -95,15 +109,62 @@ struct erspan_metadata { 
};



struct erspan_base_hdr {

	__be16 ver_vlan;

#define VER_OFFSET  12

	__be16 session_id;

#define COS_OFFSET  13

#define EN_OFFSET   11

#define BSO_OFFSET  EN_OFFSET

#define T_OFFSET    10

#if defined(__LITTLE_ENDIAN_BITFIELD)

	__u8	vlan_upper:4,

		ver:4;

	__u8	vlan:8;

	__u8	session_id_upper:2,

		t:1,

		en:2,

		cos:3;

	__u8	session_id:8;

#elif defined(__BIG_ENDIAN_BITFIELD)

	__u8	ver: 4,

		vlan_upper:4;

	__u8	vlan:8;

	__u8	cos:3,

		en:2,

		t:1,

		session_id_upper:2;

	__u8	session_id:8;

#else

#error "Please fix <asm/byteorder.h>"

#endif

};



static inline void set_session_id(struct erspan_base_hdr *ershdr, u16 id)

{

	ershdr->session_id = id & 0xff;

	ershdr->session_id_upper = (id >> 8) & 0x3;

}



static inline u16 get_session_id(const struct erspan_base_hdr *ershdr)

{

	return (ershdr->session_id_upper << 8) + ershdr->session_id;

}



static inline void set_vlan(struct erspan_base_hdr *ershdr, u16 vlan)

{

	ershdr->vlan = vlan & 0xff;

	ershdr->vlan_upper = (vlan >> 8) & 0xf;

}



static inline u16 get_vlan(const struct erspan_base_hdr *ershdr)

{

	return (ershdr->vlan_upper << 8) + ershdr->vlan;

}



static inline void set_hwid(struct erspan_md2 *md2, u8 hwid)

{

	md2->hwid = hwid & 0xf;

	md2->hwid_upper = (hwid >> 4) & 0x3;

}



static inline u8 get_hwid(const struct erspan_md2 *md2)

{

	return (md2->hwid_upper << 4) + md2->hwid;

}



static inline int erspan_hdr_len(int version)

{

	return sizeof(struct erspan_base_hdr) +
@@ -120,7 +181,7 @@ static inline u8 tos_to_cos(u8 tos) 
}



static inline void erspan_build_header(struct sk_buff *skb,

				__be32 id, u32 index,

				u32 id, u32 index,

				bool truncate, bool is_ipv4)

{

	struct ethhdr *eth = (struct ethhdr *)skb->data;
@@ -154,12 +215,12 @@ static inline void erspan_build_header(struct sk_buff *skb, 
	memset(ershdr, 0, sizeof(*ershdr) + ERSPAN_V1_MDSIZE);



	/* Build base header */

	ershdr->ver_vlan = htons((vlan_tci & VLAN_MASK) |

				 (ERSPAN_VERSION << VER_OFFSET));

	ershdr->session_id = htons((u16)(ntohl(id) & ID_MASK) |

			   ((tos_to_cos(tos) << COS_OFFSET) & COS_MASK) |

			   (enc_type << EN_OFFSET & EN_MASK) |

			   ((truncate << T_OFFSET) & T_MASK));

	ershdr->ver = ERSPAN_VERSION;

	ershdr->cos = tos_to_cos(tos);

	ershdr->en = enc_type;

	ershdr->t = truncate;

	set_vlan(ershdr, vlan_tci);

	set_session_id(ershdr, id);



	/* Build metadata */

	ersmd = (struct erspan_metadata *)(ershdr + 1);
@@ -187,7 +248,7 @@ static inline __be32 erspan_get_timestamp(void) 
}



static inline void erspan_build_header_v2(struct sk_buff *skb,

					  __be32 id, u8 direction, u16 hwid,

					  u32 id, u8 direction, u16 hwid,

					  bool truncate, bool is_ipv4)

{

	struct ethhdr *eth = (struct ethhdr *)skb->data;
@@ -198,7 +259,6 @@ static inline void erspan_build_header_v2(struct sk_buff *skb, 
		__be16 tci;

	} *qp;

	u16 vlan_tci = 0;

	u16 session_id;

	u8 gra = 0; /* 100 usec */

	u8 bso = 0; /* Bad/Short/Oversized */

	u8 sgt = 0;
@@ -221,22 +281,23 @@ static inline void erspan_build_header_v2(struct sk_buff *skb, 
	memset(ershdr, 0, sizeof(*ershdr) + ERSPAN_V2_MDSIZE);



	/* Build base header */

	ershdr->ver_vlan = htons((vlan_tci & VLAN_MASK) |

				 (ERSPAN_VERSION2 << VER_OFFSET));

	session_id = (u16)(ntohl(id) & ID_MASK) |

		     ((tos_to_cos(tos) << COS_OFFSET) & COS_MASK) |

		     (bso << BSO_OFFSET & BSO_MASK) |

		     ((truncate << T_OFFSET) & T_MASK);

	ershdr->session_id = htons(session_id);

	ershdr->ver = ERSPAN_VERSION2;

	ershdr->cos = tos_to_cos(tos);

	ershdr->en = bso;

	ershdr->t = truncate;

	set_vlan(ershdr, vlan_tci);

	set_session_id(ershdr, id);



	/* Build metadata */

	md = (struct erspan_metadata *)(ershdr + 1);

	md->u.md2.timestamp = erspan_get_timestamp();

	md->u.md2.sgt = htons(sgt);

	md->u.md2.flags = htons(((1 << P_OFFSET) & P_MASK) |

				((hwid << HWID_OFFSET) & HWID_MASK) |

				((direction << DIR_OFFSET) & DIR_MASK) |

				((gra << GRA_OFFSET) & GRA_MASK));

	md->u.md2.p = 1;

	md->u.md2.ft = 0;

	md->u.md2.dir = direction;

	md->u.md2.gra = gra;

	md->u.md2.o = 0;

	set_hwid(&md->u.md2, hwid);

}



#endif

net/ipv4/ip_gre.c

+14 −24
Original line number Diff line number Diff line
@@ -114,7 +114,7 @@ MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 
static struct rtnl_link_ops ipgre_link_ops __read_mostly;

static int ipgre_tunnel_init(struct net_device *dev);

static void erspan_build_header(struct sk_buff *skb,

				__be32 id, u32 index,

				u32 id, u32 index,

				bool truncate, bool is_ipv4);



static unsigned int ipgre_net_id __read_mostly;
@@ -273,12 +273,12 @@ static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi, 


	iph = ip_hdr(skb);

	ershdr = (struct erspan_base_hdr *)(skb->data + gre_hdr_len);

	ver = (ntohs(ershdr->ver_vlan) & VER_MASK) >> VER_OFFSET;

	ver = ershdr->ver;



	/* The original GRE header does not have key field,

	 * Use ERSPAN 10-bit session ID as key.

	 */

	tpi->key = cpu_to_be32(ntohs(ershdr->session_id) & ID_MASK);

	tpi->key = cpu_to_be32(get_session_id(ershdr));

	tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex,

				  tpi->flags | TUNNEL_KEY,

				  iph->saddr, iph->daddr, tpi->key);
@@ -324,14 +324,8 @@ static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi, 
			if (ver == 1) {

				tunnel->index = ntohl(pkt_md->u.index);

			} else {

				u16 md2_flags;

				u16 dir, hwid;



				md2_flags = ntohs(pkt_md->u.md2.flags);

				dir = (md2_flags & DIR_MASK) >> DIR_OFFSET;

				hwid = (md2_flags & HWID_MASK) >> HWID_OFFSET;

				tunnel->dir = dir;

				tunnel->hwid = hwid;

				tunnel->dir = pkt_md->u.md2.dir;

				tunnel->hwid = get_hwid(&pkt_md->u.md2);

			}



		}
@@ -615,19 +609,14 @@ static void erspan_fb_xmit(struct sk_buff *skb, struct net_device *dev, 
	}



	if (version == 1) {

		erspan_build_header(skb, tunnel_id_to_key32(key->tun_id),

		erspan_build_header(skb, ntohl(tunnel_id_to_key32(key->tun_id)),

				    ntohl(md->u.index), truncate, true);

	} else if (version == 2) {

		u16 md2_flags;

		u8 direction;

		u16 hwid;



		md2_flags = ntohs(md->u.md2.flags);

		direction = (md2_flags & DIR_MASK) >> DIR_OFFSET;

		hwid = (md2_flags & HWID_MASK) >> HWID_OFFSET;



		erspan_build_header_v2(skb, tunnel_id_to_key32(key->tun_id),

				       direction, hwid,	truncate, true);

		erspan_build_header_v2(skb,

				       ntohl(tunnel_id_to_key32(key->tun_id)),

				       md->u.md2.dir,

				       get_hwid(&md->u.md2),

				       truncate, true);

	} else {

		goto err_free_rt;

	}
@@ -733,10 +722,11 @@ static netdev_tx_t erspan_xmit(struct sk_buff *skb, 


	/* Push ERSPAN header */

	if (tunnel->erspan_ver == 1)

		erspan_build_header(skb, tunnel->parms.o_key, tunnel->index,

		erspan_build_header(skb, ntohl(tunnel->parms.o_key),

				    tunnel->index,

				    truncate, true);

	else

		erspan_build_header_v2(skb, tunnel->parms.o_key,

		erspan_build_header_v2(skb, ntohl(tunnel->parms.o_key),

				       tunnel->dir, tunnel->hwid,

				       truncate, true);

net/ipv6/ip6_gre.c

+13 −23
Original line number Diff line number Diff line
@@ -513,8 +513,8 @@ static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len, 


	ipv6h = ipv6_hdr(skb);

	ershdr = (struct erspan_base_hdr *)skb->data;

	ver = (ntohs(ershdr->ver_vlan) & VER_MASK) >> VER_OFFSET;

	tpi->key = cpu_to_be32(ntohs(ershdr->session_id) & ID_MASK);

	ver = ershdr->ver;

	tpi->key = cpu_to_be32(get_session_id(ershdr));



	tunnel = ip6gre_tunnel_lookup(skb->dev,

				      &ipv6h->saddr, &ipv6h->daddr, tpi->key,
@@ -565,14 +565,8 @@ static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len, 
			if (ver == 1) {

				tunnel->parms.index = ntohl(pkt_md->u.index);

			} else {

				u16 md2_flags;

				u16 dir, hwid;



				md2_flags = ntohs(pkt_md->u.md2.flags);

				dir = (md2_flags & DIR_MASK) >> DIR_OFFSET;

				hwid = (md2_flags & HWID_MASK) >> HWID_OFFSET;

				tunnel->parms.dir = dir;

				tunnel->parms.hwid = hwid;

				tunnel->parms.dir = pkt_md->u.md2.dir;

				tunnel->parms.hwid = get_hwid(&pkt_md->u.md2);

			}



			ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
@@ -925,6 +919,7 @@ static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, 
		struct ip_tunnel_info *tun_info;

		const struct ip_tunnel_key *key;

		struct erspan_metadata *md;

		__be32 tun_id;



		tun_info = skb_tunnel_info(skb);

		if (unlikely(!tun_info ||
@@ -944,23 +939,18 @@ static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, 
		if (!md)

			goto tx_err;



		tun_id = tunnel_id_to_key32(key->tun_id);

		if (md->version == 1) {

			erspan_build_header(skb,

					    tunnel_id_to_key32(key->tun_id),

					    ntohl(tun_id),

					    ntohl(md->u.index), truncate,

					    false);

		} else if (md->version == 2) {

			u16 md2_flags;

			u16 dir, hwid;



			md2_flags = ntohs(md->u.md2.flags);

			dir = (md2_flags & DIR_MASK) >> DIR_OFFSET;

			hwid = (md2_flags & HWID_MASK) >> HWID_OFFSET;



			erspan_build_header_v2(skb,

					       tunnel_id_to_key32(key->tun_id),

					       dir, hwid, truncate,

					       false);

					       ntohl(tun_id),

					       md->u.md2.dir,

					       get_hwid(&md->u.md2),

					       truncate, false);

		}

	} else {

		switch (skb->protocol) {
@@ -982,11 +972,11 @@ static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, 
		}



		if (t->parms.erspan_ver == 1)

			erspan_build_header(skb, t->parms.o_key,

			erspan_build_header(skb, ntohl(t->parms.o_key),

					    t->parms.index,

					    truncate, false);

		else

			erspan_build_header_v2(skb, t->parms.o_key,

			erspan_build_header_v2(skb, ntohl(t->parms.o_key),

					       t->parms.dir,

					       t->parms.hwid,

					       truncate, false);

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