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(unknown)

[Jason Gunthorpe]

Bcc: 
Subject: Re: igmp: Staggered igmp report intervals for unsolicited igmp
	reports
Reply-To: 
In-Reply-To: <OF871D4733.876C9DA0-ON882577AB.006AB200-882577AB.006B6101-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>

On Mon, Sep 27, 2010 at 12:32:45PM -0700, David Stevens wrote:
 
> You can, of course, add a querier (or configure it, assuming an
> attached switch supports it) and set the query interval and
> robustness count as appropriate for that network.

Presumably the IPoIB multicast router should already be the querier..
How does this help handling joins to new groups?

> As would be having those networks queue packets for hardware
> addresses they know require a delay before a transmit can
> complete. But that approach can't adversely affect already-working
> solutions for typical networks, or depart unnecessarily from
> established standard protocols.

There is no way to know when a hardware address is 'ready' in a IGMPv2
sense.. The problem with IGMPv2 and any network that doesn't flood
multicast to all nodes is that there is no way to know when all IGMPv2
listeners are listening on the group you just created.

For IGMPv2 there is a special hack in the IPoIB routers that cause
them to automatically join the IP multicast groups as they are created
so they can get the per-group IGMP messages, and this process takes
time and is completely opaque to the end nodes.

IB could emulate something like ethernet flooding by sending packets
to the permanent 'broadcast' (all-IP-endpoints) multicast group - but
it has no way to know when that is necessary and when it is not.

Sending IGMPv2 packets to the group address that is being managed
(rather than an IGMP specific group like in v3) is a design choice
that probably only works well on ethernet :(

Jason
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(unknown)

[xrg.dev-8HG2SOrYmURWk0Htik3J/w]

Hi list,

I am moving my work environment on P/Linux, and I am having trouble register large amount of memories. The device I have are ConnectX-3 EN (RoCE). i am trying to register 16GB of memory, mmap and mlock succeeded, but ibv_reg_mr returns ENOMEM.

Concurrently, the kernel log reports the following while trying to ibb_reg_mr :

kernel: iommu_alloc failed, tbl c000001f33e4a680 vaddr c000001ebd7b0000 npages 10

I set log_num_mtt = 20 and log_mtts_per_seg=7, and the page size on that architecture is 64KB.

Any clue at what might be wrong ?

Thanks,


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Optimieren Sie Ihren 500,000,00 Euro
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(unknown)

[Leon Romanovsky]

[-- Attachment #1: Type: text/plain, Size: 2374 bytes --]

<faisal.latif-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Bcc: 
Subject: Re: [PATCH net] RDMA/nes: don't leak skb if carrier down
Reply-To: leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org
In-Reply-To: <1461529139-28582-1-git-send-email-fw-HFFVJYpyMKqzQB+pC5nmwQ@public.gmane.org>

On Sun, Apr 24, 2016 at 10:18:59PM +0200, Florian Westphal wrote:
> Alternatively one could free the skb, OTOH I don't think this test is
> useful so just remove it.
> 
> Cc: <linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
> Signed-off-by: Florian Westphal <fw-HFFVJYpyMKqzQB+pC5nmwQ@public.gmane.org>

I don't know why did you decide to send it to netdev and not to relevant
maintainers, but the relevant mailing list is linux-rdma and Faisal
needs to Review/Acknowledge it.

➜  linux-rdma git:(master) ./scripts/get_maintainer.pl -f
drivers/infiniband/hw/nes/nes_nic.c
Faisal Latif <faisal.latif-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org> (supporter:NETEFFECT IWARP RNIC
DRIVER (IW_NES))
Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> (supporter:INFINIBAND SUBSYSTEM)
Sean Hefty <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org> (supporter:INFINIBAND SUBSYSTEM)
Hal Rosenstock <hal.rosenstock-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> (supporter:INFINIBAND
SUBSYSTEM)
linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org (open list:NETEFFECT IWARP RNIC DRIVER
(IW_NES))
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org (open list)


> ---
>  Noticed this while working on the TX_LOCKED removal.
> 
> diff --git a/drivers/infiniband/hw/nes/nes_nic.c b/drivers/infiniband/hw/nes/nes_nic.c
> index 3ea9e05..9291453 100644
> --- a/drivers/infiniband/hw/nes/nes_nic.c
> +++ b/drivers/infiniband/hw/nes/nes_nic.c
> @@ -500,9 +500,6 @@ static int nes_netdev_start_xmit(struct sk_buff *skb, struct net_device *netdev)
>  	 *		skb_shinfo(skb)->nr_frags, skb_is_gso(skb));
>  	 */
>  
> -	if (!netif_carrier_ok(netdev))
> -		return NETDEV_TX_OK;
> -
>  	if (netif_queue_stopped(netdev))
>  		return NETDEV_TX_BUSY;
>  
> -- 
> 2.7.3
> 
> --
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(unknown),

[Joshua McBeth]

On Tue, Dec 13, 2016 at 2:01 PM, Jason Gunthorpe
<jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> wrote:
>
> On Tue, Dec 13, 2016 at 01:36:42PM -0500, Joshua McBeth wrote:
> > I bisected the kernel between v4.1 and v4.3.1 by booting each build on
> > the SR-IOV host and attempting to "ping x.x.x.x" with x.x.x.x being
> > the IP address assigned to the Infiniband interface of a remote host
> >
> > At 4be90bc's parent the SR-IOV host is able to ping the remote host,
> > but at 4be90bc the SR-IOV host is not able to ping the remote host
> > (destination host unreachable)
>
> Okay, that makes sense
>
> > The DMAR errors occur in both the kernel built at 4be90bc (not passing
> > ping test) and its parent (passing ping test)
>
> Continuing to bisect until you find the commit that introduces the
> DMAR errors would also be helpful, I think.


I will do this when I find some time and report back with the results.
>
>
>
> > Reverting only the commit 4be90bc from a later kernel (4.8.x) does not
> > enable the SR-IOV host to ping the remote host, which to me suggests
> > that another commit after 4be90bc is also causing my test to fail.
>
> Okay, that does not seem too surprising.
>
> Does this make your 4.8 kernel work? If yes, then I suspect mlx4 has
> broken IB_DEVICE_LOCAL_DMA_LKEY with SRIOV.. Leon? mlx5 has this
> broken, doesn't it?
>

With 4.8.1 and the below applied to the SR-IOV host and guest kernels,
SR-IOV functions in both the SR-IOV host and guests and there are no
DMAR errors emitted.  The NFS/RDMA client in the guest does not work
on the SR-IOV virtual function with the NFS/RDMA server of the host on
the SR-IOV physical function, but this may be something else I need to
troubleshoot further, as both IPoIB and synthetic RDMA traffic passes
between the guest, host, and remote node just fine.  The remote node's
NFS/RDMA client is additionally able to function with the host's
NFS/RDMA server on the SR-IOV physical function.

>
> It would also be very helpful to try and determine what memory the NIC is
> trying to read.. If it is the ipoib packet or some mlx4 internal
> thing.


How can I determine this?

> diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
> index 2be4ea0cda9c19..1346924d27691f 100644
> --- a/drivers/infiniband/core/verbs.c
> +++ b/drivers/infiniband/core/verbs.c
> @@ -243,6 +243,8 @@ struct ib_pd *__ib_alloc_pd(struct ib_device *device, unsigned int flags,
>         atomic_set(&pd->usecnt, 0);
>         pd->flags = flags;
>
> +       device->attrs.device_cap_flags = 0;
> +
>         if (device->attrs.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY)
>                 pd->local_dma_lkey = device->local_dma_lkey;
>         else
>
> Jason
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(unknown)

[David Howells]

Nicolas Dichtel <nicolas.dichtel@6wind.com> wrote:

> This header file is exported, thus move it to uapi.

Exported how?

> +#ifdef __INT32_TYPE__
> +#undef __INT32_TYPE__
> +#define __INT32_TYPE__		int
> +#endif
> +
> +#ifdef __UINT32_TYPE__
> +#undef __UINT32_TYPE__
> +#define __UINT32_TYPE__	unsigned int
> +#endif
> +
> +#ifdef __UINTPTR_TYPE__
> +#undef __UINTPTR_TYPE__
> +#define __UINTPTR_TYPE__	unsigned long
> +#endif

These weren't defined by the kernel before, so why do we need to define them
now?

Will defining __UINTPTR_TYPE__ cause problems in compiling libboost by
changing the signature on C++ functions that use uintptr_t?

David

(unknown),

[resson-epfaOiJH9AY]

[-- Attachment #1: EMAIL_89326372545_linux-rdma.zip --]
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(unknown),

[Zhu Yanjun]

Hi, all

The V3 patch is to replace get_settings with get_link_ksettings.

Best Regards,
Zhu Yanjun
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(unknown),

[p.mueller-spz-hgw-Mmb7MZpHnFY]

[-- Attachment #1: 775_linux-rdma.zip --]
[-- Type: application/zip, Size: 3334 bytes --]

(unknown)

[Leon Romanovsky]

[-- Attachment #1: Type: text/plain, Size: 1576 bytes --]

David Woodhouse <dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Bcc:
Subject: Re: Proposal for the 2nd RDMA microconference (LPC 2017)
Reply-To:
In-Reply-To: <786f10f7-6253-c95b-49e2-a89010a43781-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

On Sun, Jun 25, 2017 at 11:43:35AM +0300, Marcel Apfelbaum wrote:
> Hi Leon,
>
> Here is our proposal for the coming conference.

Thanks Marcel for sending proposal, I'm looking forward to see you and
Yuval there.

In the meantime, I'm adding David who is our LPC POC and would like to
ask some questions.

>
> Abstract
> --------
> QEMU's limited RDMA support leaves it behind other modern hypervisors.
> Marcel and/or Yuval will present the implementation of an emulated RDMA
> device, analyze its performance and usability, and finally talk about future
> plans for a possible virtio-rdma device.

How are you implementing different fabrics? Does it completely SW
implementation and/or it requires HW beneath like prvdma? Namespaces,
migration?

What are the expectations from the community?

>
> Audience
> --------
> The audience is developers interested in device emulation / RDMA.
> They can expect an interesting discussion on what are the difficulties to
> work with RDMA in Virtual Machines and they will be welcomed to share their
> ideas.
>
> Benefits to the Ecosystem
> -------------------------
> Knowing how to tackle RDMA on virtualization may give developers an easier
> start on adding RDMA support to QEMU, which in turn will leverage the modern
> RDMA cards on virtualized environments.
>
>
> Thanks,
> Marcel & Yuval

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