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From: Stefano Brivio <sbrivio@redhat.com>
To: David Gibson <david@gibson.dropbear.id.au>
Cc: passt-dev@passt.top, jmaloy@redhat.com
Subject: Re: [PATCH v7 20/27] udp: Create flows for datagrams from originating sockets
Date: Fri, 12 Jul 2024 10:21:41 +0200	[thread overview]
Message-ID: <20240712102134.35e5fa2d@elisabeth> (raw)
In-Reply-To: <ZpBjsdBWLqwE6JEh@zatzit>

On Fri, 12 Jul 2024 08:58:57 +1000
David Gibson <david@gibson.dropbear.id.au> wrote:

> On Thu, Jul 11, 2024 at 10:20:01AM +0200, Stefano Brivio wrote:
> > On Thu, 11 Jul 2024 14:26:38 +1000
> > David Gibson <david@gibson.dropbear.id.au> wrote:
> >   
> > > On Wed, Jul 10, 2024 at 11:35:23PM +0200, Stefano Brivio wrote:  
> > > > On Wed, 10 Jul 2024 09:59:08 +1000
> > > > David Gibson <david@gibson.dropbear.id.au> wrote:
> > > >     
> > > > > On Wed, Jul 10, 2024 at 12:32:02AM +0200, Stefano Brivio wrote:    
> > > > > > Nits only, here:
> > > > > > 
> > > > > > On Fri,  5 Jul 2024 12:07:17 +1000
> > > > > > David Gibson <david@gibson.dropbear.id.au> wrote:
> > > > > >    
> > > > > > > [...]
> > > > > > >
> > > > > > > + * @c:		Execution context
> > > > > > > + * @proto:	Protocol of the flow (IP L4 protocol number)
> > > > > > > + * @pif:	Interface of the flow
> > > > > > > + * @esa:	Socket address of the endpoint
> > > > > > > + * @fport:	Forwarding port number
> > > > > > > + *
> > > > > > > + * Return: sidx of the matching flow & side, FLOW_SIDX_NONE if not found
> > > > > > > + */
> > > > > > > +flow_sidx_t flow_lookup_sa(const struct ctx *c, uint8_t proto, uint8_t pif,
> > > > > > > +			   const void *esa, in_port_t fport)
> > > > > > > +{
> > > > > > > +	struct flowside fside = {      
> > > > > > 
> > > > > > And the "f" in "fside" stands for "forwarding"... I don't have any
> > > > > > quick fix in mind, and it's _kind of_ clear anyway, but this makes me
> > > > > > doubt a bit about the "forwarding" / "endpoint" choice of words.      
> > > > > 
> > > > > Heh, no, here "fside" is simply short for "flowside".  Every flowside
> > > > > has both forwarding and endpoint elements.    
> > > > 
> > > > Oh, I thought you called it fside here because you're setting the
> > > > forwarding part of it directly, or something like that.
> > > >     
> > > > > So it is confusing, but
> > > > > for a different reason.  I need to find a different convention for
> > > > > naming struct flowside variables.  I'd say 'side', but sometimes
> > > > > that's used for the 1-bit integer indicating which side in a flow.
> > > > > 
> > > > > Hrm.. now that pif has been removed from here, maybe I could rename
> > > > > struct flowside back to 'flowaddrs' or 'sideaddrs' perhaps?    
> > > > 
> > > > That's also confusing because it contains ports too (even though sure,
> > > > in some sense they're part of the address).    
> > > 
> > > Right :/.
> > >   
> > > > I would suggest keeping it
> > > > like it is in for this series, but after that, if it's not too long,
> > > > what about flow_addrs_ports?    
> > > 
> > > Still need a conventional name for the variables.  "fap" probably
> > > isn't the best look, and still has the potentially confusing "f" in
> > > it.
> > >   
> > > > Actually, I don't think flowside is that bad. What I'm struggling with
> > > > is rather 'forwarding' and 'endpoint'. I don't have any good suggestion
> > > > at the moment, anyway. Using 'local' and 'remote' (laddr/lport,
> > > > raddr/rport) would be clearer to me and avoid the conflict with 'f' of
> > > > flowside, but you had good reasons to avoid that, if I recall correctly.    
> > > 
> > > Kind of, yeah.  Local and remote are great when it's clear we're
> > > talking specifically from the point of view of the passt process.
> > > There are a bunch of cases where it's not necessarily obvious if we're
> > > talking from that point of view, the point of view of the guest, or
> > > the point of view of the host (the last usually when the endpoint is
> > > somewhere on an entirely different system).  I wanted something that
> > > wherever we were talking about it is specifically relative to the
> > > passt process itself.
> > > 
> > > I get the impression that "forwarding" is causing more trouble here
> > > than "endpoint".  "midpoint address"?  "intercepted address"?
> > > "redirected address" (probably not, that's 'r' like remote but this
> > > would be the local address)?  
> > 
> > I think "forwarding" is still better than any of those. Perhaps "passt
> > address" (and paddr/pport)... but I'm not sure it's much better than
> > "forwarding".  
> 
> Hm.  "passthrough address"?  Kind of means the same thing as
> "forwarding" in context, and maybe evokes the idea that this is the
> address that passt itself owns?

I'd still prefer "forwarding" to that... at least I almost got used to
it, "passthrough" is even more confusing because not everything really
passes... through?

The part I'm missing (with any of those) is "here" vs. "there", that
is, a reference to the "where" and to the topology instead of what that
side does.

Again, I would just leave that as "forwarding" in this series, and then
change it everywhere if we come up with something nicer.

-- 
Stefano


  reply	other threads:[~2024-07-12  8:22 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-07-05  2:06 [PATCH v7 00/27] Unified flow table David Gibson
2024-07-05  2:06 ` [PATCH v7 01/27] flow: Common address information for initiating side David Gibson
2024-07-05  2:06 ` [PATCH v7 02/27] flow: Common address information for target side David Gibson
2024-07-10 21:30   ` Stefano Brivio
2024-07-11  0:19     ` David Gibson
2024-07-05  2:07 ` [PATCH v7 03/27] tcp, flow: Remove redundant information, repack connection structures David Gibson
2024-07-05  2:07 ` [PATCH v7 04/27] tcp: Obtain guest address from flowside David Gibson
2024-07-05  2:07 ` [PATCH v7 05/27] tcp: Manage outbound address via flow table David Gibson
2024-07-05  2:07 ` [PATCH v7 06/27] tcp: Simplify endpoint validation using flowside information David Gibson
2024-07-05  2:07 ` [PATCH v7 07/27] tcp_splice: Eliminate SPLICE_V6 flag David Gibson
2024-07-05  2:07 ` [PATCH v7 08/27] tcp, flow: Replace TCP specific hash function with general flow hash David Gibson
2024-07-05  2:07 ` [PATCH v7 09/27] flow, tcp: Generalise TCP hash table to general flow hash table David Gibson
2024-07-05  2:07 ` [PATCH v7 10/27] tcp: Re-use flow hash for initial sequence number generation David Gibson
2024-07-05  2:07 ` [PATCH v7 11/27] icmp: Remove redundant id field from flow table entry David Gibson
2024-07-05  2:07 ` [PATCH v7 12/27] icmp: Obtain destination addresses from the flowsides David Gibson
2024-07-05  2:07 ` [PATCH v7 13/27] icmp: Look up ping flows using flow hash David Gibson
2024-07-05  2:07 ` [PATCH v7 14/27] icmp: Eliminate icmp_id_map David Gibson
2024-07-05  2:07 ` [PATCH v7 15/27] flow: Helper to create sockets based on flowside David Gibson
2024-07-10 21:32   ` Stefano Brivio
2024-07-11  0:21     ` David Gibson
2024-07-11  0:27     ` David Gibson
2024-07-05  2:07 ` [PATCH v7 16/27] icmp: Manage outbound socket address via flow table David Gibson
2024-07-05  2:07 ` [PATCH v7 17/27] flow, tcp: Flow based NAT and port forwarding for TCP David Gibson
2024-07-05  2:07 ` [PATCH v7 18/27] flow, icmp: Use general flow forwarding rules for ICMP David Gibson
2024-07-05  2:07 ` [PATCH v7 19/27] fwd: Update flow forwarding logic for UDP David Gibson
2024-07-08 21:26   ` Stefano Brivio
2024-07-09  0:19     ` David Gibson
2024-07-05  2:07 ` [PATCH v7 20/27] udp: Create flows for datagrams from originating sockets David Gibson
2024-07-09 22:32   ` Stefano Brivio
2024-07-09 23:59     ` David Gibson
2024-07-10 21:35       ` Stefano Brivio
2024-07-11  4:26         ` David Gibson
2024-07-11  8:20           ` Stefano Brivio
2024-07-11 22:58             ` David Gibson
2024-07-12  8:21               ` Stefano Brivio [this message]
2024-07-15  4:06                 ` David Gibson
2024-07-15 16:37                   ` Stefano Brivio
2024-07-17  0:49                     ` David Gibson
2024-07-05  2:07 ` [PATCH v7 21/27] udp: Handle "spliced" datagrams with per-flow sockets David Gibson
2024-07-09 22:32   ` Stefano Brivio
2024-07-10  0:23     ` David Gibson
2024-07-10 17:13       ` Stefano Brivio
2024-07-11  1:30         ` David Gibson
2024-07-11  8:23           ` Stefano Brivio
2024-07-11  2:48         ` David Gibson
2024-07-12 13:34   ` Stefano Brivio
2024-07-15  4:32     ` David Gibson
2024-07-05  2:07 ` [PATCH v7 22/27] udp: Remove obsolete splice tracking David Gibson
2024-07-10 21:36   ` Stefano Brivio
2024-07-11  0:43     ` David Gibson
2024-07-05  2:07 ` [PATCH v7 23/27] udp: Find or create flows for datagrams from tap interface David Gibson
2024-07-10 21:36   ` Stefano Brivio
2024-07-11  0:45     ` David Gibson
2024-07-05  2:07 ` [PATCH v7 24/27] udp: Direct datagrams from host to guest via flow table David Gibson
2024-07-10 21:37   ` Stefano Brivio
2024-07-11  0:46     ` David Gibson
2024-07-05  2:07 ` [PATCH v7 25/27] udp: Remove obsolete socket tracking David Gibson
2024-07-05  2:07 ` [PATCH v7 26/27] udp: Remove rdelta port forwarding maps David Gibson
2024-07-05  2:07 ` [PATCH v7 27/27] udp: Rename UDP listening sockets David Gibson

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