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Thu, 25 Jan 2024 08:27:00 +0000 (GMT) Message-ID: <8090bb34-1b70-43ea-ae13-df5d9a5eb761@linux.ibm.com> Date: Thu, 25 Jan 2024 09:26:59 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [REGRESSION] v6.8 SMC-D issues To: Wen Gu , wenjia@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, jaka@linux.ibm.com, Matthew Rosato Cc: Linux regressions mailing list , borntraeger@linux.ibm.com, svens@linux.ibm.com, alibuda@linux.alibaba.com, tonylu@linux.alibaba.com, raspl@linux.ibm.com, schnelle@linux.ibm.com, guangguan.wang@linux.alibaba.com, linux-s390@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Halil Pasic References: <20231219142616.80697-1-guwen@linux.alibaba.com> <20231219142616.80697-8-guwen@linux.alibaba.com> <13579588-eb9d-4626-a063-c0b77ed80f11@linux.ibm.com> <530afe45-ba6b-4970-a71c-1f1255f5fca9@linux.alibaba.com> Content-Language: en-US From: Alexandra Winter In-Reply-To: <530afe45-ba6b-4970-a71c-1f1255f5fca9@linux.alibaba.com> Content-Type: text/plain; charset=UTF-8 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: hL-eyvXh5IfeJnQxS3WvRFG4GCoUuQvl X-Proofpoint-GUID: d9-pXlaTopAnnCB5pTPeUJJRJKxMjHfa Content-Transfer-Encoding: 8bit X-Proofpoint-UnRewURL: 0 URL was un-rewritten Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-01-25_04,2024-01-24_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 adultscore=0 spamscore=0 lowpriorityscore=0 mlxscore=0 malwarescore=0 phishscore=0 impostorscore=0 clxscore=1015 priorityscore=1501 mlxlogscore=999 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2401250057 On 25.01.24 05:59, Wen Gu wrote: > After a while debug I found an elementary mistake of mine in > b40584d ("net/smc: compatible with 128-bits extended GID of virtual ISM device").. > > The operator order in smcd_lgr_match() is not as expected. It will always return > 'true' in remote-system case. > >  static bool smcd_lgr_match(struct smc_link_group *lgr, > -                          struct smcd_dev *smcismdev, u64 peer_gid) > +                          struct smcd_dev *smcismdev, > +                          struct smcd_gid *peer_gid) >  { > -       return lgr->peer_gid == peer_gid && lgr->smcd == smcismdev; > +       return lgr->peer_gid.gid == peer_gid->gid && lgr->smcd == smcismdev && > +               smc_ism_is_virtual(smcismdev) ? > +               (lgr->peer_gid.gid_ext == peer_gid->gid_ext) : 1; >  } > > Could you please try again with this patch? to see if this is the root cause. > Really sorry for the inconvenience. > > diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c > index da6a8d9c81ea..c6a6ba56c9e3 100644 > --- a/net/smc/smc_core.c > +++ b/net/smc/smc_core.c > @@ -1896,8 +1896,8 @@ static bool smcd_lgr_match(struct smc_link_group *lgr, >                            struct smcd_gid *peer_gid) >  { >         return lgr->peer_gid.gid == peer_gid->gid && lgr->smcd == smcismdev && > -               smc_ism_is_virtual(smcismdev) ? > -               (lgr->peer_gid.gid_ext == peer_gid->gid_ext) : 1; > +               (smc_ism_is_virtual(smcismdev) ? > +                (lgr->peer_gid.gid_ext == peer_gid->gid_ext) : 1); >  } > > > Thanks, > Wen Gu Hello Wen Gu, thank you for the quick resposne and for finding this nasty bug. I can confirm that with your patch I do not see the issue anymore. Please send a fix to the mailing lists. See https://docs.kernel.org/process/handling-regressions.html for some tips. May I propose that instead of adding the brackets, you change this function to an if-then-else sequence for readability and maintainability? I would still mention the missing brackets in the commit message, so readers can quickly understand the issue. Thanks again for the quick response. Sandy