From: Samuel Thibault <samuel.thibault@gnu.org>
To: Thomas Huth <thuth@redhat.com>
Cc: zhanghailiang <zhang.zhanghailiang@huawei.com>,
Li Zhijian <lizhijian@cn.fujitsu.com>,
Stefan Hajnoczi <stefanha@gmail.com>,
Jason Wang <jasowang@redhat.com>,
Dave Gilbert <dgilbert@redhat.com>,
Vasiliy Tolstov <v.tolstov@selfip.ru>,
qemu-devel@nongnu.org, Gonglei <arei.gonglei@huawei.com>,
Jan Kiszka <jan.kiszka@siemens.com>,
Huangpeng <peter.huangpeng@huawei.com>,
Yang Hongyang <yanghy@cn.fujitsu.com>,
Guillaume Subiron <maethor@subiron.org>
Subject: Re: [Qemu-devel] [PATCHv7 1/9] slirp: Adding IPv6, ICMPv6 Echo and NDP autoconfiguration
Date: Tue, 9 Feb 2016 17:31:19 +0100 [thread overview]
Message-ID: <20160209163119.GB3102@var.bordeaux.inria.fr> (raw)
In-Reply-To: <56BA1057.6030409@redhat.com>
Thomas Huth, on Tue 09 Feb 2016 17:14:15 +0100, wrote:
> > + return (a.s6_addr[prefix_len / 8] >> (8 - (prefix_len % 8)))
> > + == (b.s6_addr[prefix_len / 8] >> (8 - (prefix_len % 8)));
>
> checkpatch.pl complains here:
>
> ERROR: return is not a function, parentheses are not required
This is a false positive, there are no outer parentheses here.
> There are also some other stylistic problems that checkpatch.pl reports
> in this file ... would be nice to fix them.
Uh, it seems they are new, I had made a checkpatch run at the time (but
that was like several months ago now...). So I'll have to go through it
again...
> > +static void icmp6_send_echoreply(struct mbuf *m, Slirp *slirp, struct ip6 *ip,
> > + struct icmp6 *icmp)
> > +{
> > + struct mbuf *t = m_get(slirp);
> > + t->m_len = sizeof(struct ip6) + ntohs(ip->ip_pl);
> > + memcpy(t->m_data, m->m_data, t->m_len);
> > +
> > + /* IPv6 Packet */
> > + struct ip6 *rip = mtod(t, struct ip6 *);
>
> Not sure how strictly this is handled in QEMU, but for proper portable
> C, variables should be declared at the beginning of a scope, as far as I
> know.
AIUI, qemu requires C99, doesn't it?
Personnally I find it more readable to declare variables where they
start mattering instead of far away.
> > + m->m_len += ETH_HLEN;
> > + m->m_data -= ETH_HLEN;
> > + struct ethhdr *eth = mtod(m, struct ethhdr *);
> > + m->m_len -= ETH_HLEN;
> > + m->m_data += ETH_HLEN;
>
> Manipulating m_len is not really required here, is it?
Indeed, I however preferred to keep it for always keeping consistency,
in case mtod starts doing other stuff.
> > + /* ICMPv6 Checksum */
> > + t->m_data -= NDPOPT_LINKLAYER_LEN;
> > + t->m_data -= ICMP6_NDP_RA_MINLEN;
> > + t->m_data -= sizeof(struct ip6);
>
> I think you could shorten this to:
>
> t_m_data = rip;
That's equivalent, yes. We are here however following the current slirp
practice, which explicits what is happening here.
I'll also have a closer look at the rest, thanks,
Samuel
next prev parent reply other threads:[~2016-02-09 16:31 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-08 10:28 [Qemu-devel] [PATCHv7 0/9] slirp: Adding IPv6 support to Qemu -net user mode Samuel Thibault
2016-02-08 10:28 ` [Qemu-devel] [PATCHv7 1/9] slirp: Adding IPv6, ICMPv6 Echo and NDP autoconfiguration Samuel Thibault
2016-02-09 16:14 ` Thomas Huth
2016-02-09 16:31 ` Samuel Thibault [this message]
2016-02-09 19:32 ` Thomas Huth
2016-02-09 20:16 ` Samuel Thibault
2016-02-09 16:31 ` Eric Blake
2016-02-09 16:35 ` Samuel Thibault
2016-02-09 19:56 ` Samuel Thibault
2016-02-09 20:49 ` Thomas Huth
2016-02-09 20:31 ` Samuel Thibault
2016-02-08 10:28 ` [Qemu-devel] [PATCHv7 2/9] slirp: Adding ICMPv6 error sending Samuel Thibault
2016-02-09 19:48 ` Thomas Huth
2016-02-08 10:28 ` [Qemu-devel] [PATCHv7 3/9] slirp: Adding IPv6 UDP support Samuel Thibault
2016-02-09 20:44 ` Thomas Huth
2016-02-09 21:13 ` Samuel Thibault
2016-02-09 21:19 ` Samuel Thibault
2016-02-10 7:18 ` Thomas Huth
2016-02-10 7:37 ` Samuel Thibault
2016-02-08 10:28 ` [Qemu-devel] [PATCHv7 4/9] slirp: Factorizing tcpiphdr structure with an union Samuel Thibault
2016-02-10 8:05 ` Thomas Huth
2016-02-10 9:28 ` Samuel Thibault
2016-02-10 10:08 ` Thomas Huth
2016-02-10 12:20 ` Samuel Thibault
2016-02-08 10:28 ` [Qemu-devel] [PATCHv7 5/9] slirp: Generalizing and neutralizing various TCP functions before adding IPv6 stuff Samuel Thibault
2016-02-10 8:35 ` Thomas Huth
2016-02-10 9:17 ` Samuel Thibault
2016-02-08 10:28 ` [Qemu-devel] [PATCHv7 6/9] slirp: Reindent after refactoring Samuel Thibault
2016-02-10 8:42 ` Thomas Huth
2016-02-10 9:20 ` Samuel Thibault
2016-02-11 17:56 ` Eric Blake
2016-02-11 18:15 ` Samuel Thibault
2016-02-08 10:28 ` [Qemu-devel] [PATCHv7 7/9] slirp: Handle IPv6 in TCP functions Samuel Thibault
2016-02-10 10:47 ` Thomas Huth
2016-02-10 12:30 ` Samuel Thibault
2016-02-10 12:41 ` Thomas Huth
2016-02-08 10:28 ` [Qemu-devel] [PATCHv7 8/9] slirp: Adding IPv6 address for DNS relay Samuel Thibault
2016-02-08 10:28 ` [Qemu-devel] [PATCHv7 9/9] qapi-schema, qemu-options & slirp: Adding Qemu options for IPv6 addresses Samuel Thibault
2016-02-08 22:12 ` Eric Blake
2016-02-10 11:39 ` Thomas Huth
2016-02-10 12:45 ` Samuel Thibault
2016-02-10 13:08 ` Daniel P. Berrange
2016-02-11 20:30 ` Thomas Huth
2016-02-14 17:47 [Qemu-devel] [PATCHv8 0/9] slirp: Adding IPv6 support to Qemu -net user mode Samuel Thibault
2016-02-14 17:47 ` [Qemu-devel] [PATCHv7 1/9] slirp: Adding IPv6, ICMPv6 Echo and NDP autoconfiguration Samuel Thibault
2016-02-16 11:36 ` Thomas Huth
2016-02-19 13:57 ` Thomas Huth
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