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| author | Tonghao Zhang <xiangxia.m.yue@gmail.com> | 2019-11-14 23:51:08 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-11-15 12:43:27 -0800 |
| commit | 61ca533c0e94104c35fcb7858a23ec9a05d78143 (patch) | |
| tree | a7598e6fe8882e6d04b987e6b1ca43ce75739b31 /net/openvswitch | |
| parent | 3bb884a4a0c4177c61233424d43d61545c4fc528 (diff) | |
| download | linux-61ca533c0e94104c35fcb7858a23ec9a05d78143.tar.bz2 | |
net: openvswitch: don't call pad_packet if not necessary
The nla_put_u16/nla_put_u32 makes sure that
*attrlen is align. The call tree is that:
nla_put_u16/nla_put_u32
-> nla_put attrlen = sizeof(u16) or sizeof(u32)
-> __nla_put attrlen
-> __nla_reserve attrlen
-> skb_put(skb, nla_total_size(attrlen))
nla_total_size returns the total length of attribute
including padding.
Cc: Joe Stringer <joe@ovn.org>
Cc: William Tu <u9012063@gmail.com>
Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/openvswitch')
| -rw-r--r-- | net/openvswitch/datapath.c | 22 |
1 files changed, 8 insertions, 14 deletions
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c index 8ce1f773378d..93d4991ddc1f 100644 --- a/net/openvswitch/datapath.c +++ b/net/openvswitch/datapath.c @@ -487,23 +487,17 @@ static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, } /* Add OVS_PACKET_ATTR_MRU */ - if (upcall_info->mru) { - if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, - upcall_info->mru)) { - err = -ENOBUFS; - goto out; - } - pad_packet(dp, user_skb); + if (upcall_info->mru && + nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) { + err = -ENOBUFS; + goto out; } /* Add OVS_PACKET_ATTR_LEN when packet is truncated */ - if (cutlen > 0) { - if (nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, - skb->len)) { - err = -ENOBUFS; - goto out; - } - pad_packet(dp, user_skb); + if (cutlen > 0 && + nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) { + err = -ENOBUFS; + goto out; } /* Add OVS_PACKET_ATTR_HASH */ |