From: Julian Anastasov <ja@ssi.bg>
To: Hannes Frederic Sowa <hannes@stressinduktion.org>
Cc: netdev@vger.kernel.org, Marcelo Leitner <mleitner@redhat.com>,
Florian Westphal <fw@strlen.de>
Subject: Re: [PATCH net v2] ipv4: try to cache dst_entries which would cause a redirect
Date: Thu, 22 Jan 2015 21:57:14 +0200 (EET) [thread overview]
Message-ID: <alpine.LFD.2.11.1501222135140.2572@ja.home.ssi.bg> (raw)
In-Reply-To: <1421930098.14431.8.camel@stressinduktion.org>
Hello,
On Thu, 22 Jan 2015, Hannes Frederic Sowa wrote:
> I would try to not introduce this complexity. I am currently researching
> if this change does improve things:
>
> do_cache = res->fi && !itag;
> - if (out_dev == in_dev && err && IN_DEV_TX_REDIRECTS(out_dev) &&
> - (IN_DEV_SHARED_MEDIA(out_dev) ||
> - inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res)))) {
> - flags |= RTCF_DOREDIRECT;
> - do_cache = false;
> + if (skb->protocol == htons(ETH_P_IP)) {
> + if (out_dev == in_dev && err && IN_DEV_TX_REDIRECTS(out_dev) &&
> + skb->protocol == htons(ETH_P_IP) &&
Above is duplicate. Or better to remove first
and to keep this second check if flag is not cleared below...
> + (IN_DEV_SHARED_MEDIA(out_dev) ||
> + inet_addr_onlink(out_dev, saddr, FIB_RES_GW(*res))))
> + IPCB(skb)->flags |= IPSKB_DOREDIRECT;
> + else if (IPCB(skb)->flags & IPSKB_DOREDIRECT)
> + IPCB(skb)->flags &= ~IPSKB_DOREDIRECT;
It seems we do not need to clear the flag for
ip_options_rcv_srr purposes because ip_route_input is called
only if initial rt_type is RTN_LOCAL, so the flag should be
unset. ip_mkroute_input/__mkroute_input is called only for
forwarding.
In ip_options_rcv_srr we have RTN_LOCAL ... [RTN_LOCAL]
and may be final RTN_UNICAST. The flag can be set and used
only for RTN_UNICAST and that is the final ip_route_input
called there. Lets keep it just with the 2nd ETH_P_IP check?
Regards
--
Julian Anastasov <ja@ssi.bg>
next prev parent reply other threads:[~2015-01-22 19:57 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-21 12:41 [PATCH net v2] ipv4: try to cache dst_entries which would cause a redirect Hannes Frederic Sowa
2015-01-21 21:26 ` Julian Anastasov
2015-01-22 12:34 ` Hannes Frederic Sowa
2015-01-22 19:57 ` Julian Anastasov [this message]
2015-01-23 10:54 ` Hannes Frederic Sowa
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