From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yw0-f180.google.com ([209.85.161.180]:35794 "EHLO mail-yw0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754107AbcKIQmQ (ORCPT ); Wed, 9 Nov 2016 11:42:16 -0500 MIME-Version: 1.0 In-Reply-To: <2975B49B-2696-4E2A-B9D0-2D6CB607EC59@oracle.com> References: <2975B49B-2696-4E2A-B9D0-2D6CB607EC59@oracle.com> From: Parav Pandit Date: Wed, 9 Nov 2016 22:11:52 +0530 Message-ID: Subject: Re: wireshark's RPC-over-RDMA dissector To: Chuck Lever Cc: Linux NFS Mailing List , List Linux RDMA Mailing Content-Type: text/plain; charset=UTF-8 Sender: linux-nfs-owner@vger.kernel.org List-ID: Hi Chuck, Just FYI. I have committed few fixes in wireshark trunk for RoCE and IB dissectors which will in general benefit other ULPs as well (primary for statefulness of ULPs) last month. I have few patches pending in my sandbox in area of RoCE and for other ULP that I will push in coming days, likely next week. I am currently actively testing them and have made steady progress so far. I will try to find sometime to review them next week. Regards, Parav Pandit On Wed, Nov 9, 2016 at 9:35 PM, Chuck Lever wrote: > Hi- > > Thanks to Yan Berman, for a couple of years now we've had a basic > RPC-over-RDMA dissector in wireshark that can be used with ibdump > captures. There have been some bugs noted, but no-one has had the > cycles to dig in and address. > > Recently Tom Haynes helped me set up my own wireshark build so I > could help address some of the known issues. > > http://git.linux-nfs.org/?p=3Dcel/wireshark.git;a=3Dshortlog;h=3Drefs/hea= ds/rpc-rdma-fixes > > Posting here for review before I take the next steps to push these > to the wireshark community. Constructive critique and other > suggestions are welcome. > > The fixes so far focus on dissecting transport headers correctly. > There continue to be significant open issues with the dissector: > =E2=80=A2 There does not appear to be any support for dissecting > RPC-over-RDMA on iWARP or RoCE > =E2=80=A2 The NFS dissector does not handle portions of the XDR > stream that were transmitted via RDMA Read/Write > =E2=80=A2 RPC messages conveyed via RDMA_NOMSG are not recognized > or dissected > =E2=80=A2 There is no association between RDMA Reads and Writes > and the RPC-over-RDMA message they go with > =E2=80=A2 A CREQ / CREP pair are needed to identify which QP > numbers are used for RPC-over-RDMA traffic > =E2=80=A2 With TCP, the dissector fully outdents the RPC and NFS > dissection results; but with RDMA, the dissector places > the results in the tree under the Infiniband header > =E2=80=A2 Not enough error detection in the dissector > > -- > Chuck Lever > > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-rdma" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html