netdev - Re: [PATCH net-next 12/15] ipvlan: Cache net in ipvlan_process_v4_outbound and ipvlan_process_v6

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Date:	Tue, 6 Oct 2015 18:19:22 -0700
From:	Mahesh Bandewar <maheshb@...gle.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	David Miller <davem@...emloft.net>,
	netfilter-devel@...r.kernel.org,
	linux-netdev <netdev@...r.kernel.org>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	lvs-devel@...r.kernel.org
Subject: Re: [PATCH net-next 12/15] ipvlan: Cache net in ipvlan_process_v4_outbound
 and ipvlan_process_v6_outbound

On Tue, Oct 6, 2015 at 11:53 AM, Eric W. Biederman
<ebiederm@...ssion.com> wrote:
> Compute net once in ipvlan_process_v4_outbound and ipvlan_process_v6_outbound
> and store it in a variable so that net does not need to be recomputed next time
> it is used.
>
It's used exactly once at this moment so don't know what "next time"
is. Do you have any additional patch(es) planned?

> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
> ---
>  drivers/net/ipvlan/ipvlan_core.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ipvlan/ipvlan_core.c b/drivers/net/ipvlan/ipvlan_core.c
> index 75dcf36c0366..976f30b291f6 100644
> --- a/drivers/net/ipvlan/ipvlan_core.c
> +++ b/drivers/net/ipvlan/ipvlan_core.c
> @@ -344,6 +344,7 @@ static int ipvlan_process_v4_outbound(struct sk_buff *skb)
>  {
>         const struct iphdr *ip4h = ip_hdr(skb);
>         struct net_device *dev = skb->dev;
> +       struct net *net = dev_net(dev);
>         struct rtable *rt;
>         int err, ret = NET_XMIT_DROP;
>         struct flowi4 fl4 = {
> @@ -354,7 +355,7 @@ static int ipvlan_process_v4_outbound(struct sk_buff *skb)
>                 .saddr = ip4h->saddr,
>         };
>
> -       rt = ip_route_output_flow(dev_net(dev), &fl4, NULL);
> +       rt = ip_route_output_flow(net, &fl4, NULL);
>         if (IS_ERR(rt))
>                 goto err;
>
> @@ -381,6 +382,7 @@ static int ipvlan_process_v6_outbound(struct sk_buff *skb)
>  {
>         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
>         struct net_device *dev = skb->dev;
> +       struct net *net = dev_net(dev);
>         struct dst_entry *dst;
>         int err, ret = NET_XMIT_DROP;
>         struct flowi6 fl6 = {
> @@ -393,7 +395,7 @@ static int ipvlan_process_v6_outbound(struct sk_buff *skb)
>                 .flowi6_proto = ip6h->nexthdr,
>         };
>
> -       dst = ip6_route_output(dev_net(dev), NULL, &fl6);
> +       dst = ip6_route_output(net, NULL, &fl6);
>         if (dst->error) {
>                 ret = dst->error;
>                 dst_release(dst);
> --
> 2.2.1
>
> --
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