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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?Q0M74nF20pkBMU/bLWKJLOdF/lE5x/DnmmXo31nSrubdupOypPdlj+QNOxkJ?= =?us-ascii?Q?JTIi09/Zs67QvF9oHrsGZSCokOxT92SQXmWPtuwU3obeOfNGWDxd6h+Kc0L7?= =?us-ascii?Q?PpfoYvlLj/oNpjJ5/t9DZN89PgLEkz+14Qpdl2AR/xnKuADNsMgPjJNqtXmi?= =?us-ascii?Q?UPCa3fTM88+pNSBTNyUpsGVNFdTi27ryoixMyCrUn11T2dJ1heuNb6sjUi7Z?= =?us-ascii?Q?c2CXkO7odRMpfoAw+sp7Czx72CrLgPXFrv3n4WBRH7ej40ZDe93QnSFv/r/p?= =?us-ascii?Q?YToJ7oK3F0+jFHP/PKTmWwDfYjtBZa7j7XsJ7/6CGZowiaJd6T6jjtPhHctQ?= =?us-ascii?Q?OpQJYkiu5JzOlFbodLu+SNHT/06I4kabVGH/cMyjP7ALhW7o61A1FzhEjHRd?= =?us-ascii?Q?Mdh/gd/+IcDeXKgQQb0CrLg/BS0gf8xo4CcS0+WUDnK/nZA9nmGsxjmRSYSo?= =?us-ascii?Q?ytCk2X68DdG2XOZIis0kEmrmBoQajfykwS8M2kZXAOmnmt0krRXpjZ9h1qUX?= =?us-ascii?Q?i3KlLhS/LlH20Ntgcm5v8llks1smcJ8gzcKlpQM/twMJ3lWPrBe9hVrtRze3?= =?us-ascii?Q?Wp3/n2fvWiHHVNGGExYKjrjCmcPEfHSq7hEW8Ek2tVVoZn7JN1RZ6DkR44uR?= =?us-ascii?Q?SPyZN/YqDi1ogyH1vpyWOWHAtY5KP/fcBirwqJotXTDPahRvseDqA3rA/xU5?= =?us-ascii?Q?HEhm9xT5trr6LewTByci7Bic4vzJITQ89JHoBEffMqqix5n+kVp3ggu0ZqYg?= =?us-ascii?Q?od5f1rohEmBjLsElT1pJEUzSqlwt6Y9Vdqo6i6oOixHxMNgVfTPUWKWGXzHV?= =?us-ascii?Q?oA6HQTprj3e8dor9q+IEcuvCZPouh4BtXZXQkwXPO9ooicsN1fdlsW2HkaBw?= =?us-ascii?Q?L9J2li80lQi+cmJ+BEC6BspE+9sp2NrlZW9Ny8h72ztWhLo6qSeuQmFUUTbW?= =?us-ascii?Q?tyNJYRNpbn0wz4xiI1i1In0ea3YmeuyhqfkoTCHXiehiyGAUDomGUAmE4rLc?= =?us-ascii?Q?4lbR4A/1NEbHsunC76sFqdqiHCEREud/hCDAL0vqvMlVFPqyzUiTx/MnR1CM?= =?us-ascii?Q?efEG1MSry44+CQq3npf8b4Sk25M06OlRI8rRtIvLAeLfhEk8f8M/CE39jyxP?= =?us-ascii?Q?S7UmkS7WtKRInZlEo6RulIrPTouUU5dded3mTeUFTKOt3ax6YfNH5Nuclsre?= =?us-ascii?Q?lkwoHS6SxH2T/2R+Fq9SbfjlY+IT36f+6vUo4xINsH7EiG32IdAHpYSu1F6P?= =?us-ascii?Q?fhruAbgZA1iR1Ek3S5e8LGla/P4DqkkBd9UzHmp7DEKe8NYlmJ0iVGc43JXi?= =?us-ascii?Q?f+/XzAJntIjCmcZVfxhuDzYW6BkGuAWjrKTUQVANMYZd5zidHQOqLcIuiz03?= =?us-ascii?Q?ZvIb60HOYnKENpWy0Kb3KqFqMKCw0DWN97g3/+++P7/6ijxcTnUxEFuM6o+F?= =?us-ascii?Q?/v4YOskB55ZccuYMoI0jgFHeP5WQNzeDSbbNvR8mjOwNxgjAvTurJtXqRJpR?= =?us-ascii?Q?scBVbyeEZ2Eiu3355U+R2Y1JOCyuWmmBBk2TpFpMZ7O0lKaoJoscnNuFa/z4?= =?us-ascii?Q?is1y5HNxefUUPlebxva+bu+WuUkIeeFPMkCSdAtobqLXab/vTDRNvgl73SGf?= =?us-ascii?Q?HA=3D=3D?= X-MS-Exchange-CrossTenant-Network-Message-Id: 4c5d52dd-46d9-4ac1-a687-08db2f247c4b X-MS-Exchange-CrossTenant-AuthSource: PH8PR11MB8107.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Mar 2023 00:36:35.5749 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: Tk1DalhiLkkWObzK919wVTSUnuZkaNeXKpMh2go4wSFXUUCglWG/MybF/ZdI5A0+c9kxHWMvtAR/vwYoMklfsoYF9gbOvrGyCyOwqz5bCDE= X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR11MB6267 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Ming Lei wrote: > Hello Jens, > > Add IORING_OP_FUSED_CMD, it is one special URING_CMD, which has to > be SQE128. The 1st SQE(master) is one 64byte URING_CMD, and the 2nd > 64byte SQE(slave) is another normal 64byte OP. For any OP which needs > to support slave OP, io_issue_defs[op].fused_slave needs to be set as 1, > and its ->issue() can retrieve/import buffer from master request's > fused_cmd_kbuf. The slave OP is actually submitted from kernel, part of > this idea is from Xiaoguang's ublk ebpf patchset, but this patchset > submits slave OP just like normal OP issued from userspace, that said, > SQE order is kept, and batching handling is done too. Hi Ming, io_uring and ublk are starting to be more on my radar these days. I wanted to take a look at this series, but could not get past the distracting "master"/"slave" terminology in this lead-in paragraph let alone start looking at patches. Frankly, the description sounds more like "head"/"tail", or even "fuse0"/"fuse1" because, for example, who is to say you might not have larger fused ops in the future and need terminology to address "fuse{0,1,2,3}"? Once that's fixed up I can take a look at forwarding on to others that might be interested in this use case. https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/coding-style.rst#n338 Thanks in advance for fixing that up!