netdev - Re: [PATCH V2 net-next 07/14] net/tls: Support TLS device offload with IPv6

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Date:   Thu, 22 Mar 2018 22:18:41 +0000
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "davem@...emloft.net" <davem@...emloft.net>,
        "sergei.shtylyov@...entembedded.com" 
        <sergei.shtylyov@...entembedded.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davejwatson@...com" <davejwatson@...com>,
        Boris Pismenny <borisp@...lanox.com>,
        Ilya Lesokhin <ilyal@...lanox.com>
Subject: Re: [PATCH V2 net-next 07/14] net/tls: Support TLS device offload
 with IPv6

On Thu, 2018-03-22 at 12:36 +0300, Sergei Shtylyov wrote:
> Hello!
> 
> On 3/22/2018 12:01 AM, Saeed Mahameed wrote:
> 
> > From: Ilya Lesokhin <ilyal@...lanox.com>
> > 
> > Previously get_netdev_for_sock worked only with IPv4.
> > 
> > Signed-off-by: Ilya Lesokhin <ilyal@...lanox.com>
> > Signed-off-by: Boris Pismenny <borisp@...lanox.com>
> > Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
> 
>     Only stylistic comments...
> 
> > ---
> >   net/tls/tls_device.c | 49
> > ++++++++++++++++++++++++++++++++++++++++++++++++-
> >   1 file changed, 48 insertions(+), 1 deletion(-)
> > 
> > diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
> > index e623280ea019..c35fc107d9c5 100644
> > --- a/net/tls/tls_device.c
> > +++ b/net/tls/tls_device.c
> > @@ -34,6 +34,11 @@
> >   #include <net/inet_common.h>
> >   #include <linux/highmem.h>
> >   #include <linux/netdevice.h>
> > +#include <net/addrconf.h>
> > +#include <net/flow.h>
> > +#include <linux/ipv6.h>
> > +#include <net/dst.h>
> > +#include <linux/security.h>
> >   
> >   #include <net/tls.h>
> >   #include <crypto/aead.h>
> > @@ -99,13 +104,55 @@ static void
> > tls_device_queue_ctx_destruction(struct tls_context *ctx)
> >   	spin_unlock_irqrestore(&tls_device_lock, flags);
> >   }
> >   
> > +static inline struct net_device *ipv6_get_netdev(struct sock *sk)
> > +{
> > +	struct net_device *dev = NULL;
> > +#if IS_ENABLED(CONFIG_IPV6)
> > +	struct inet_sock *inet = inet_sk(sk);
> > +	struct ipv6_pinfo *np = inet6_sk(sk);
> > +	struct flowi6 _fl6, *fl6 = &_fl6;
> > +	struct dst_entry *dst;
> > +
> > +	memset(fl6, 0, sizeof(*fl6));
> > +	fl6->flowi6_proto = sk->sk_protocol;
> > +	fl6->daddr = sk->sk_v6_daddr;
> > +	fl6->saddr = np->saddr;
> > +	fl6->flowlabel = np->flow_label;
> > +	IP6_ECN_flow_xmit(sk, fl6->flowlabel);
> > +	fl6->flowi6_oif = sk->sk_bound_dev_if;
> > +	fl6->flowi6_mark = sk->sk_mark;
> > +	fl6->fl6_sport = inet->inet_sport;
> > +	fl6->fl6_dport = inet->inet_dport;
> > +	fl6->flowi6_uid = sk->sk_uid;
> > +	security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
> > +
> > +	if (ipv6_stub->ipv6_dst_lookup(sock_net(sk), sk, &dst,
> > fl6) < 0)
> > +		return NULL;
> > +
> > +	dev = dst->dev;
> > +	dev_hold(dev);
> > +	dst_release(dst);
> > +
> > +#endif
> 
>     I think the above empty line should be outside #if as you need an
> empty 
> line between the declaration and other statements.
> 

Boris Fixed this in V3, will submit today.

> > +	return dev;
> > +}
> > +
> >   /* We assume that the socket is already connected */
> >   static struct net_device *get_netdev_for_sock(struct sock *sk)
> >   {
> >   	struct inet_sock *inet = inet_sk(sk);
> >   	struct net_device *netdev = NULL;
> >   
> > -	netdev = dev_get_by_index(sock_net(sk), inet-
> > >cork.fl.flowi_oif);
> > +	if (sk->sk_family == AF_INET)
> > +		netdev = dev_get_by_index(sock_net(sk),
> > +					  inet-
> > >cork.fl.flowi_oif);
> > +	else if (sk->sk_family == AF_INET6) {
> 
>     Need {} in the 1st *if* branch since you have it in the 2nd.
> 

The else if clause will be under #if IS_ENABLED(CONFIG_IPV6) in v3.

> > +		netdev = ipv6_get_netdev(sk);
> > +		if (!netdev && !sk->sk_ipv6only &&
> > +		    ipv6_addr_type(&sk->sk_v6_daddr) ==
> > IPV6_ADDR_MAPPED)
> > +			netdev = dev_get_by_index(sock_net(sk),
> > +						  inet-
> > >cork.fl.flowi_oif);
> > +	}
> >   
> >   	return netdev;
> >   }
> 
> MBR, Sergei
> 
>