On Tue, Oct 24, 2023 at 09:59:27AM +0200, Harald Dunkel wrote: > Hi folks, > > according to https://www.jmicron.com/file/download/1002/JMS583_Product+Brief.pdf > my USB-C M.2 adapter "JMicron USA Technology Corp. JMS583Gen 2 to PCIe Gen3x2 Bridge" > is supposed to support trim, but sg_vpd reports Note: sg_vpd is a SCSI-reporting program, not a USB-reporting program, and you are asking it to report the contents of the block page. > {root@cecil:data10 () 506} sg_vpd -p bl /dev/sdd > Block limits VPD page (SBC): > Write same non-zero (WSNZ): 0 > Maximum compare and write length: 0 blocks [Command not implemented] > Optimal transfer length granularity: 8 blocks > Maximum transfer length: 65535 blocks > Optimal transfer length: 65535 blocks > Maximum prefetch transfer length: 65535 blocks > Maximum unmap LBA count: -1 [unbounded] > Maximum unmap block descriptor count: 63 > Optimal unmap granularity: 0 blocks [not reported] > Unmap granularity alignment valid: false > Unmap granularity alignment: 0 [invalid] > Maximum write same length: 0 blocks [not reported] > Maximum atomic transfer length: 0 blocks [not reported] > Atomic alignment: 0 [unaligned atomic writes permitted] > Atomic transfer length granularity: 0 [no granularity requirement > Maximum atomic transfer length with atomic boundary: 0 blocks [not reported] > Maximum atomic boundary size: 0 blocks [can only write atomic 1 block] > > {root@cecil:data10 () 507} sg_vpd -p lbpv /dev/sdd > Logical block provisioning VPD page (SBC): > Unmap command supported (LBPU): 1 > Write same (16) with unmap bit supported (LBPWS): 0 > Write same (10) with unmap bit supported (LBPWS10): 0 > Logical block provisioning read zeros (LBPRZ): 0 > Anchored LBAs supported (ANC_SUP): 0 > Threshold exponent: 0 [threshold sets not supported] > Descriptor present (DP): 0 > Minimum percentage: 0 [not reported] > Provisioning type: 0 (not known or fully provisioned) > Threshold percentage: 0 [percentages not supported] > > {root@cecil:data10 () 508} lsusb > Bus 002 Device 004: ID 152d:0583 JMicron Technology Corp. / JMicron USA Technology Corp. JMS583Gen 2 to PCIe Gen3x2 Bridge > : > > > You can surely better estimate than me whether these values sound > reasonable. Do they? I hesitate to set provisioning_mode to unmap. > > Device is an ICY BOX M.2 SSD/NVMe adaptor IB-1807MT-C31. Given that virtually all the information you have provided refers to the SCSI or block device interface rather than the USB device interface, it seems you would be a lot better off posting this question to a SCSI- or block-related mailing list. About all I can say with regard to your question is that the bridge probably supports trim commands if the drive connected to it does. Alan Stern
