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Date: Mon, 18 May 2015 12:06:15 +0200
From: Michael Wang <yun.wang@...fitbricks.com>
To: Or Gerlitz <gerlitz.or@...il.com>
CC: Roland Dreier <roland@...nel.org>,
Sean Hefty <sean.hefty@...el.com>,
Hal Rosenstock <hal@....mellanox.co.il>,
Doug Ledford <dledford@...hat.com>,
"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
Linux Kernel <linux-kernel@...r.kernel.org>,
linux-doc@...r.kernel.org, Or Gerlitz <ogerlitz@...lanox.com>,
Ira Weiny <ira.weiny@...el.com>,
Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Subject: Re: [PATCH RFC v2] Documentation/infiniband: Add docs for rdma-helpers
Hi, Or
On 05/18/2015 11:47 AM, Or Gerlitz wrote:
[snip]
>> Highlights:
>> There could be many missing/mistakes/misunderstanding, please don't
>> be hesitate to point out the issues, any suggestions to improve or
>> complete the description are very welcomed ;-)
>
> Michael, none of what you wrote above belongs to the change-log which
> is going to stay for-ever in the upstream git repo. You should put it
> all belong the --- line after your S.O.B and add proper change log
> telling what this patch is about
Thanks for point out this for me :-)
I'll put the highlights and changelog under '---' in next version, is it
looks like this?
Subject: [PATCH RFC v3] Documentation/infiniband: Add docs for rdma-helpers
This is the following patch for:
https://lkml.org/lkml/2015/5/5/417
which try to document the settled rdma_cap_XX().
Signed-off-by: Michael Wang <yun.wang@...fitbricks.com>
---
Highlights:
There could be many missing/mistakes/misunderstanding, please don't
be hesitate to point out the issues, any suggestions to improve or
complete the description are very welcomed ;-)
v2:
* Merge the descriptions from Doug:
http://www.spinics.net/lists/linux-rdma/msg25172.html
v3:
...
Documentation/infiniband/rdma_helpers.txt | 79 +++++++++++++++++++++++++++++++
1 file changed, 79 insertions(+)
create mode 100644 Documentation/infiniband/rdma_helpers.txt
diff --git a/Documentation/infiniband/rdma_helpers.txt b/Documentation/infiniband/rdma_helpers.txt
new file mode 100644
index 0000000..be9416d
--- /dev/null
+++ b/Documentation/infiniband/rdma_helpers.txt
Regards,
Michael Wang
>
>>
>> Signed-off-by: Michael Wang <yun.wang@...fitbricks.com>
>> ---
>> Documentation/infiniband/rdma_helpers.txt | 79 +++++++++++++++++++++++++++++++
>> 1 file changed, 79 insertions(+)
>> create mode 100644 Documentation/infiniband/rdma_helpers.txt
>>
>> diff --git a/Documentation/infiniband/rdma_helpers.txt b/Documentation/infiniband/rdma_helpers.txt
>> new file mode 100644
>> index 0000000..be9416d
>> --- /dev/null
>> +++ b/Documentation/infiniband/rdma_helpers.txt
>> @@ -0,0 +1,79 @@
>> +RDMA HELPERS
>> +
>> + The following helpers are used to check the specific capabilities of a
>> + particular port before utilizing those capabilities.
>> +
>> + rdma_cap_ib_mad - Infiniband Management Datagrams.
>> + rdma_cap_ib_smi - Infiniband Subnet Management Interface.
>> + rdma_cap_ib_cm - Infiniband Communication Manager.
>> + rdma_cap_iw_cm - IWARP Communication Manager.
>> + rdma_cap_ib_sa - Infiniband Subnet Administration.
>> + rdma_cap_ib_mcast - Infiniband Multicast Join/Leave Protocol.
>> + rdma_cap_read_multi_sge - RDMA Read Work Request Support Multiple SGE.
>> + rdma_cap_af_ib - Native Infiniband Address.
>> + rdma_cap_eth_ah - InfiniBand Transport With Ethernet Address.
>> +
>> +USAGE
>> +
>> + if (rdma_cap_XX(device, i)) {
>> + /* The port i of device support XX */
>> + ...
>> + } else {
>> + /* The port i of device don't support XX */
>> + ...
>> + }
>> +
>> + rdma_cap_ib_mad
>> + ---------------
>> + Management Datagrams (MAD) are a required part of the InfiniBand
>> + specification and are supported on all InfiniBand devices. A slightly
>> + extended version are also supported on OPA interfaces.
>> +
>> + rdma_cap_ib_smi
>> + ---------------
>> + Subnet Management Interface (SMI) will handle SMP packet from SM
>> + in an infiniband fabric.
>> +
>> + rdma_cap_ib_cm
>> + ---------------
>> + Communication Manager (CM) service, used to ease the process of connecting
>> + to a remote host. The IB-CM can be used to connect to remote hosts using
>> + either InfiniBand or RoCE connections, iWARP has its own CM.
>> +
>> + rdma_cap_iw_cm
>> + ---------------
>> + iWARP Communication Manager (CM), Similar to the IB-CM, but only used on
>> + iWARP devices.
>> +
>> + rdma_cap_ib_sa
>> + ---------------
>> + Subnet Administration (SA) is the database built by SM in an
>> + infiniband fabric.
>> +
>> + rdma_cap_ib_mcast
>> + ---------------
>> + InfiniBand (and OPA) use a different multicast mechanism rather than
>> + traditional IP multicast found on Ethernet devices. If this is true, then
>> + traditional IPv4/IPv6 multicast is handled by the IPoIB layer and direct
>> + multicast joins and leaves are handled per the InfiniBand specifications.
>> +
>> + rdma_cap_read_multi_sge
>> + ---------------
>> + Certain devices (iWARP in particular) have restrictions on the number of
>> + scatter gather elements that can be present in an RDMA READ work request,
>> + this is true if the device does not have that restriction.
>> +
>> + rdma_cap_af_ib
>> + ---------------
>> + Many code paths for traditional InfiniBand and RoCE links are the same,
>> + but need minor differences to accommodate the different addresses on the
>> + two types of connections. This helper is true when the address of the
>> + specific connection is of the InfiniBand native variety.
>> +
>> + rdma_cap_eth_ah
>> + ---------------
>> + Queue Pair is InfiniBand transport, but uses Ethernet address instead
>> + of native InfiniBand address (aka, this is a RoCE QP, and that means
>> + ethertype 0x8915 + GRH for RoCEv1 and IP/UDP to well known UDP port for
>> + RoCEv2), this is true when the address family of the specific queue pair
>> + is of the Ethernet (RoCE) variety.
>> --
>> 2.1.0
>>
>> --
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