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Miller" , Jakub Kicinski , Eric Dumazet , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Benjamin Herrenschmidt , Kuniyuki Iwashima , , , Subject: Re: [PATCH v6 bpf-next 03/11] tcp: Keep TCP_CLOSE sockets in the reuseport group. 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X-MS-Exchange-AntiSpam-MessageData: qwHDB3+Vzw5EJPibqdoJDvlQ+GxZS87E3lLuusWaHFmx16RM+4GWTm3xRTmWMJCguwJsRCvd155+p1gWvRawSpVin1eVSfBBUUQuqJN+cNq88cIkoc7KjdgqWn5/UJBko9+q4TeimaC0b2ph7LY+9hVA4THrehjmBx3bYkNnORvItBTF9E/jJQ0XPYtAYuw5uXjhQIuc4/BDbN1KMjOzxuTBc5Hye3hxBeFH4kfkE2zOoWN021RsPnFQKwTnUUqxQD7Nqo7YBfbXKVFN6zhl9pIKfT+4LXl8aZU2r4CYaLl/RffUFq7uJASYweWlMflqxo5FcBgUt1cPS/eqkxhzlbzFQpcsfnhjNFUlFQyPVmwe2nKf+PlUwed4FYzDa/U53nJIzwJqrbSRBorngMhRmsgq24NAioACLK7JS0mOSBP4rUxGph4wyBsORkR0ZujIgU/jX3rD28gTbwAQpCAUEYFbnIBoCqqfym057ZYl1myc5cmV6FZCwsdPjTd8GUe/hwilLMayJBcML1Q1ntsKWqWLF8T6NRjVgAZZOZ69mQEbXnkphOJ20MknEy2Iv9Pz768IYIPHh8I0wi1C+fxyObjrsQ8YYGUSULdEGX54fVNSIH1bfSNa6Ik59NjVVuvVlzm5KmW0Kb30H3ygIfkX6MD1aeWPhi9oVhws0VDo1TgWosXG4SFEZ7dbCmxuXlTXM86WwOA0okspAXzVs+bad1co7h0edBLUKaFuzoMKS9WRg2C7aEP4RR75SEt6p4I+lawr1GgJv/bjuKs9xxVDMQ== X-MS-Exchange-CrossTenant-Network-Message-Id: cce4ff6a-7fcc-40fe-8039-08d91b58416c X-MS-Exchange-CrossTenant-AuthSource: BY5PR15MB3571.namprd15.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 May 2021 06:26:52.1215 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 8ae927fe-1255-47a7-a2af-5f3a069daaa2 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 2cpfhkoFr3hmzgmRCCYUANzF6x0AMi1EOhovyyasmFfUeq+IHV4SzRMxepRO11y8 X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR15MB2455 X-OriginatorOrg: fb.com X-Proofpoint-ORIG-GUID: FlVLX34j4wOv0Y2GhGlRMeVVz4vvtI3_ X-Proofpoint-GUID: FlVLX34j4wOv0Y2GhGlRMeVVz4vvtI3_ X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.761 definitions=2021-05-19_10:2021-05-19,2021-05-19 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 mlxscore=0 phishscore=0 mlxlogscore=915 impostorscore=0 lowpriorityscore=0 adultscore=0 malwarescore=0 suspectscore=0 clxscore=1015 priorityscore=1501 spamscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2105200051 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, May 17, 2021 at 09:22:50AM +0900, Kuniyuki Iwashima wrote: > +static int reuseport_resurrect(struct sock *sk, struct sock_reuseport *old_reuse, > + struct sock_reuseport *reuse, bool bind_inany) > +{ > + if (old_reuse == reuse) { > + /* If sk was in the same reuseport group, just pop sk out of > + * the closed section and push sk into the listening section. > + */ > + __reuseport_detach_closed_sock(sk, old_reuse); > + __reuseport_add_sock(sk, old_reuse); > + return 0; > + } > + > + if (!reuse) { > + /* In bind()/listen() path, we cannot carry over the eBPF prog > + * for the shutdown()ed socket. In setsockopt() path, we should > + * not change the eBPF prog of listening sockets by attaching a > + * prog to the shutdown()ed socket. Thus, we will allocate a new > + * reuseport group and detach sk from the old group. > + */ For the reuseport_attach_prog() path, I think it needs to consider the reuse->num_closed_socks != 0 case also and that should belong to the resurrect case. For example, when sk_unhashed(sk) but sk->sk_reuseport == 0.