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Mon, 31 Jan 2022 07:39:36 +0000 (GMT) Received: from [9.145.79.147] (unknown [9.145.79.147]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 31 Jan 2022 07:39:36 +0000 (GMT) Message-ID: Date: Mon, 31 Jan 2022 08:39:52 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 Subject: Re: [PATCH net] net/smc: Forward wakeup to smc socket waitqueue after fallback Content-Language: en-US To: Wen Gu , davem@davemloft.net, kuba@kernel.org Cc: linux-s390@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org References: <1643211184-53645-1-git-send-email-guwen@linux.alibaba.com> From: Karsten Graul Organization: IBM Deutschland Research & Development GmbH In-Reply-To: <1643211184-53645-1-git-send-email-guwen@linux.alibaba.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: MU1qctkQpv0rWYqh9LbEmKUDcYOrsmCD X-Proofpoint-ORIG-GUID: 8yjufBpds7F-sxT2dp7SXWLbUdxFUSlD X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2022-01-31_02,2022-01-28_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 suspectscore=0 lowpriorityscore=0 mlxscore=0 impostorscore=0 clxscore=1015 phishscore=0 malwarescore=0 adultscore=0 bulkscore=0 spamscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2201310050 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 26/01/2022 16:33, Wen Gu wrote: > When we replace TCP with SMC and a fallback occurs, there may be > some socket waitqueue entries remaining in smc socket->wq, such > as eppoll_entries inserted by userspace applications. > > After the fallback, data flows over TCP/IP and only clcsocket->wq > will be woken up. Applications can't be notified by the entries > which were inserted in smc socket->wq before fallback. So we need > a mechanism to wake up smc socket->wq at the same time if some > entries remaining in it. Acked-by: Karsten Graul