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net: erspan: use bitfield instead of mask and offset

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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: William Tu <u9012063@gmail.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
William Tu
2018-01-25 13:20:09 -08:00
committed by David S. Miller
parent b89d06ce58
commit c69de58ba8
3 changed files with 121 additions and 80 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
net/ipv6/ip6_gre.c
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@@ -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);