I cannot issue TRIM commands to SSD behind a JMS578-based sata to usb-c adapter. Tried with Fedora 28 kernel and with latest 4.18.0-0.rc6.git0.1.vanilla.knurd.1.fc28.x86_64 lsblk -D shows that discard is not enabled, but the SSD has this capability (see below) However Windows 10 successfully TRIMs the device. Also the trimcheck.exe tool validates the TRIM operation. This makes me think the linux uas driver needs additional reverse engineering or support from Jmicron about this chipset. Steps to Reproduce: [root@localhost ~]# blkdiscard -v /dev/sda Actual results: blkdiscard: /dev/sda: BLKDISCARD ioctl failed: Operation not supported Expected results: /dev/sda: Discarded 250059350016 bytes from the offset 0 Additional info: I believe smartmontools website [https://www.smartmontools.org/wiki/Supported_USB-Devices] incorrectly lists this usb bridge as JMS567, because their firmware upgrade tool identifies the device as 578, something that is suggested by the PID (0x0578 and not 0x0567), and I've been able to successfully try out several firmware versions available on usbdev.ru while the attempts for 567 failed. Also smartmontools drivedb.h update suggests also this is indeed a 578 https://www.smartmontools.org/ticket/841 --- [root@localhost ~]$ grep $ /sys/block/sda/queue/discard_* /sys/block/sda/queue/discard_granularity:0 /sys/block/sda/queue/discard_max_bytes:0 /sys/block/sda/queue/discard_max_hw_bytes:0 /sys/block/sda/queue/discard_zeroes_data:0 --- [root@localhost ~]# lsblk -D /dev/sda NAME DISC-ALN DISC-GRAN DISC-MAX DISC-ZERO sda 0 0B 0B 0 └─sda1 0 0B 0B 0 --- dmesg: [ 1842.832155] usb 2-2: new SuperSpeed USB device number 3 using xhci_hcd [ 1842.845457] usb 2-2: New USB device found, idVendor=152d, idProduct=0578, bcdDevice= 2.04 [ 1842.845461] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 1842.845463] usb 2-2: Product: HDD USB Device [ 1842.845464] usb 2-2: Manufacturer: JMicron [ 1842.845466] usb 2-2: SerialNumber: 339AE81B6296382 [ 1842.851744] scsi host1: uas [ 1842.852472] scsi 1:0:0:0: Direct-Access sobetter Ext 0204 PQ: 0 ANSI: 6 [ 1842.853765] sd 1:0:0:0: Attached scsi generic sg0 type 0 [ 1842.854104] sd 1:0:0:0: [sda] 488397168 512-byte logical blocks: (250 GB/233 GiB) [ 1842.854106] sd 1:0:0:0: [sda] 4096-byte physical blocks [ 1842.854264] sd 1:0:0:0: [sda] Write Protect is off [ 1842.854266] sd 1:0:0:0: [sda] Mode Sense: 53 00 00 08 [ 1842.854573] sd 1:0:0:0: [sda] Disabling FUA [ 1842.854575] sd 1:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 1842.865814] sda: sda1 [ 1842.867420] sd 1:0:0:0: [sda] Attached SCSI disk --- [root@localhost ~]# lsusb.py -e [...] 2-2 152d:0578 00 3.00 5000MBit/s 896mA 1IF (JMicron HDD USB Device 339AE81B6296382) (EP) 00: Control attr 00 len 07 max 200 --- [root@localhost ~]# lsusb -v -d 152d:0578 Bus 002 Device 003: ID 152d:0578 JMicron Technology Corp. / JMicron USA Technology Corp. JMS567 SATA 6Gb/s bridge Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 3.00 bDeviceClass 0 bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 9 idVendor 0x152d JMicron Technology Corp. / JMicron USA Technology Corp. idProduct 0x0578 JMS567 SATA 6Gb/s bridge bcdDevice 2.04 iManufacturer 1 JMicron iProduct 2 HDD USB Device iSerial 3 339AE81B6296382 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 121 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0x80 (Bus Powered) MaxPower 896mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 8 Mass Storage bInterfaceSubClass 6 SCSI bInterfaceProtocol 80 Bulk-Only iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0400 1x 1024 bytes bInterval 0 bMaxBurst 15 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x02 EP 2 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0400 1x 1024 bytes bInterval 0 bMaxBurst 15 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 1 bNumEndpoints 4 bInterfaceClass 8 Mass Storage bInterfaceSubClass 6 SCSI bInterfaceProtocol 98 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x01 EP 1 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0400 1x 1024 bytes bInterval 0 bMaxBurst 0 Command pipe (0x01) Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0400 1x 1024 bytes bInterval 0 bMaxBurst 0 MaxStreams 32 Status pipe (0x02) Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x83 EP 3 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0400 1x 1024 bytes bInterval 0 bMaxBurst 15 MaxStreams 32 Data-in pipe (0x03) Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x04 EP 4 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0400 1x 1024 bytes bInterval 0 bMaxBurst 7 MaxStreams 32 Data-out pipe (0x04) Binary Object Store Descriptor: bLength 5 bDescriptorType 15 wTotalLength 22 bNumDeviceCaps 2 USB 2.0 Extension Device Capability: bLength 7 bDescriptorType 16 bDevCapabilityType 2 bmAttributes 0x00000f0e BESL Link Power Management (LPM) Supported BESL value 3840 us SuperSpeed USB Device Capability: bLength 10 bDescriptorType 16 bDevCapabilityType 3 bmAttributes 0x00 wSpeedsSupported 0x000e Device can operate at Full Speed (12Mbps) Device can operate at High Speed (480Mbps) Device can operate at SuperSpeed (5Gbps) bFunctionalitySupport 1 Lowest fully-functional device speed is Full Speed (12Mbps) bU1DevExitLat 10 micro seconds bU2DevExitLat 32 micro seconds can't get debug descriptor: Resource temporarily unavailable Device Status: 0x000c (Bus Powered) U1 Enabled U2 Enabled --- [asus@localhost ~]$ sudo sg_readcap -l /dev/sda Read Capacity results: Protection: prot_en=0, p_type=0, p_i_exponent=0 Logical block provisioning: lbpme=0, lbprz=0 Last logical block address=488397167 (0x1d1c596f), Number of logical blocks=488397168 Logical block length=512 bytes Logical blocks per physical block exponent=3 [so physical block length=4096 bytes] Lowest aligned logical block address=0 Hence: Device size: 250059350016 bytes, 238475.2 MiB, 250.06 GB --- [asus@localhost ~]$ sudo sg_vpd -p thpv /dev/sda abbreviation doesn't match a VPD page Available standard VPD pages: ai 0x89 ATA information (SAT) aod 0x82 ASCII implemented operating definition (obsolete) adsn 0xb3 Automation device serial number (SSC) bl 0xb0 Block limits (SBC) ble 0xb7 Block limits extension (SBC) bdc 0xb1 Block device characteristics (SBC) bdce 0xb5 Block device characteristics extension (SBC) cfa 0x8c CFA profile information dc 0x8b Device constituents di 0x83 Device identification di_asis 0x83 Like 'di' but designators ordered as found di_lu 0x83 Device identification, lu only di_port 0x83 Device identification, target port only di_target 0x83 Device identification, target device only dtde 0xb4 Data transfer device element address (SSC) ei 0x86 Extended inquiry data iod 0x81 Implemented operating definition (obsolete) lbpro 0xb5 Logical block protection (SSC) lbpv 0xb2 Logical block provisioning (SBC) mas 0xb1 Manufacturer assigned serial number (SSC) masa 0xb1 Manufacturer assigned serial number (ADC) mna 0x85 Management network addresses mpp 0x87 Mode page policy oi 0xb0 OSD information pc 0x8a Power condition psm 0x8d Power consumption pslu 0x90 Protocol-specific logical unit information pspo 0x91 Protocol-specific port information ref 0xb3 Referrals (SBC) sad 0xb0 Sequential access device capabilities (SSC) sii 0x84 Software interface identification sinq -1 Standard inquiry response sn 0x80 Unit serial number sp 0x88 SCSI ports st 0xb1 Security token (OSD) sbl 0xb4 Supported block lengths and protection types (SBC) sv 0x00 Supported VPD pages tas 0xb2 TapeAlert supported flags (SSC) tpc 0x8f Third party copy zbdc 0xb6 Zoned block device characteristics Vendor/product identifiers: dds 3 DDS tape family from IBM emc 2 EMC (company) hp3par 4 3PAR array (HP was Left Hand) ibm_lto 5 IBM LTO tape/systems hp_lto 6 HP LTO tape/systems rdac 1 RDAC array (NetApp E-Series) sea 0 Seagate disk Vendor specific VPD pages: aci 0xc5,6 ACI revision level (HP LTO) datc 0xc1,0 Date code (Seagate) dcrl 0xc0,5 Drive component revision levels (IBM LTO) ddsver 0xc0,3 Firmware revision (DDS) devb 0xc3,0 Device behavior (Seagate) dsn 0xc1,5 Drive serial numbers (IBM LTO) ducd 0xc7,5 Device unique configuration data (IBM LTO) edid 0xc8,1 Extended device identification (RDAC) prm4 0xc3,1 Feature Parameters (RDAC) firm 0xc0,0 Firmware numbers (Seagate) frl 0xc0,6 Firmware revision level (HP LTO) fwr4 0xc1,1 Firmware version (RDAC) head 0xc4,6 Head Assy revision level (HP LTO) hp3par 0xc0,4 Volume information (HP/3PAR) hrl 0xc1,6 Hardware revision level (HP LTO) hwr4 0xc0,1 Hardware version (RDAC) jump 0xc2,0 Jump setting (Seagate) mech 0xc3,6 Mechanism revision level (HP LTO) mpds 0xc8,5 Mode parameter default settings (IBM LTO) pca 0xc2,6 PCA revision level (HP LTO) rvsi 0xca,1 Replicated volume source identifier (RDAC) said 0xd0,1 Storage array world wide name (RDAC) subs 0xc4,1 Subsystem identifier (RDAC) swr4 0xc2,1 Software version (RDAC) upr 0xc0,2 Unit path report (EMC) vac1 0xc9,1 Volume access control (RDAC) --- [asus@localhost ~]$ sudo hdparm -I /dev/sda | grep -i trim * Data Set Management TRIM supported (limit 8 blocks) * Deterministic read ZEROs after TRIM -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at 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