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Tue, 20 Apr 2021 14:45:31 +0000 From: "Belanger, Martin" To: Hannes Reinecke , James Smart , Martin Belanger , "linux-nvme@lists.infradead.org" CC: "kbusch@kernel.org" , "axboe@fb.com" , "hch@lst.de" , "sagi@grimberg.me" Subject: Re: [PATCH 0/1] Add Host Transport Interface option (host-triface) Thread-Topic: [PATCH 0/1] Add Host Transport Interface option (host-triface) Thread-Index: AQHXMi3cXRd0eX/PLU64uVU3qFLVL6q2M0EAgAAaVryAAOb4AIAAHbnVgAYmxlg= Date: Tue, 20 Apr 2021 14:45:31 +0000 Message-ID: References: , , In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_34759c52-a6db-4813-b00f-5ea20e29646d_Enabled=True; MSIP_Label_34759c52-a6db-4813-b00f-5ea20e29646d_SiteId=945c199a-83a2-4e80-9f8c-5a91be5752dd; MSIP_Label_34759c52-a6db-4813-b00f-5ea20e29646d_SetDate=2021-04-20T14:45:30.625Z; MSIP_Label_34759c52-a6db-4813-b00f-5ea20e29646d_Name=Public; MSIP_Label_34759c52-a6db-4813-b00f-5ea20e29646d_ContentBits=0; MSIP_Label_34759c52-a6db-4813-b00f-5ea20e29646d_Method=Standard; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org Hi Hannes, Just checking if there were any update on this. I understand that you'd prefer if we used the existing option --host-traddr= to specify the interface. However, this option only sets the source addres= s on the socket. But that's ok because we do need an option to set the sour= ce address without affecting which interface is used for the connection. A separate option, --host-triface, specifically designed to configure the i= nterface makes more sense. Here's why: 1) It's more intuitive to specify the "interface name" than the associated = "IP address". Using an IP Address to specify an interface is confusing. One= needs to perform a reverse lookup to figure out which IP address is associ= ated with an interface. 2) There is no "hard" association between IP addresses and interfaces. The = IP address associated with an interface can simply be changed with the comm= and "ip addr [add|delete|change]". Worse, the same IP address can be assign= ed to more than one interface (e.g. ip addr add 20.20.20.20/24 dev enp2s0 &= & ip addr add 20.20.20.20/24 dev enp2s1). That may be a silly thing to do, = but it's allowed. Regards, Martin ________________________________________ From: Belanger, Martin Sent: Friday, April 16, 2021 12:15 To: Hannes Reinecke; James Smart; Martin Belanger; linux-nvme@lists.infrade= ad.org Cc: kbusch@kernel.org; axboe@fb.com; hch@lst.de; sagi@grimberg.me Subject: Re: [PATCH 0/1] Add Host Transport Interface option (host-triface) Hi Hannes, For our use case, we need both features. We need to be able to specify the = "interface" and we need to be able to specify the "source address". And we = need both features to be controlled with separate "knobs". Regards, Martin ________________________________________ From: Hannes Reinecke Sent: Friday, April 16, 2021 10:26 To: Belanger, Martin; James Smart; Martin Belanger; linux-nvme@lists.infrad= ead.org Cc: kbusch@kernel.org; axboe@fb.com; hch@lst.de; sagi@grimberg.me Subject: Re: [PATCH 0/1] Add Host Transport Interface option (host-triface) [EXTERNAL EMAIL] On 4/16/21 2:41 AM, Belanger, Martin wrote: > Re-sending in Plain Text mode. > > Hi James, > > With HOST_TRADDR, we use bind() to bind to an address just before invokin= g connect(). I also used > to think that this was the way to force packets to be routed onto the int= erface matching the address > used in the bind(). But that is not the case (I tested it). bind() does n= ot control the routing > of transmitted packets. The only thing that bind() does is to set the sou= rce address on the socket > so that when a remote process queries the peer address (getpeername), it = will see that address as > the source address. > > It's only a setsockopt() with SO_BINDTODEVICE that can force packets to g= o out on a specific > interface (I tested that as well). > Hmm. But arguably this was what 'host_traddr' was supposed to achieve. If you compare commit 8f4e8dace3d1 ("nvme-rdma: add support for host_traddr") it clearly states that the request should be _send_ via the interface specified with host_traddr. So in the light of this I'd rather modify the current handling of host_traddr for tcp. Unless this was intentionally coded this way. Sagi? Cheers, Hannes -- Dr. Hannes Reinecke Kernel Storage Architect hare@suse.de +49 911 74053 688 SUSE Software Solutions Germany GmbH, 90409 N=FCrnberg GF: F. Imend=F6rffer, HRB 36809 (AG N=FCrnberg) _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme