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Tue, 14 Nov 2023 01:37:57 +0000 Received: from CY8PR10MB7243.namprd10.prod.outlook.com ([fe80::449f:4fd9:2d3e]) by CY8PR10MB7243.namprd10.prod.outlook.com ([fe80::449f:4fd9:2d3e%4]) with mapi id 15.20.6977.029; Tue, 14 Nov 2023 01:37:57 +0000 From: Mike Christie To: mwilck@suse.com, john.g.garry@oracle.com, bvanassche@acm.org, hch@lst.de, martin.petersen@oracle.com, linux-scsi@vger.kernel.org, james.bottomley@hansenpartnership.com Cc: Mike Christie Subject: [PATCH v12 04/20] scsi: sd: Have scsi-ml retry read_capacity_16 errors Date: Mon, 13 Nov 2023 19:37:34 -0600 Message-Id: <20231114013750.76609-5-michael.christie@oracle.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231114013750.76609-1-michael.christie@oracle.com> References: <20231114013750.76609-1-michael.christie@oracle.com> X-ClientProxiedBy: DM6PR06CA0077.namprd06.prod.outlook.com (2603:10b6:5:336::10) To CY8PR10MB7243.namprd10.prod.outlook.com (2603:10b6:930:7c::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY8PR10MB7243:EE_|CH2PR10MB4199:EE_ X-MS-Office365-Filtering-Correlation-Id: c392c728-ef42-4f9d-c764-08dbe4b25484 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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There are 2 behavior changes with this patch: 1. There is one behavior change where we no longer retry when scsi_execute_cmd returns < 0, but we should be ok. We don't need to retry for failures like the queue being removed, and for the case where there are no tags/reqs since the block layer waits/retries for us. For possible memory allocation failures from blk_rq_map_kern we use GFP_NOIO, so retrying will probably not help. 2. For the specific UAs we checked for and retried, we would get READ_CAPACITY_RETRIES_ON_RESET retries plus whatever retries were left from the main loop's retries. Each UA now gets READ_CAPACITY_RETRIES_ON_RESET reties, and the other errors get up to 3 retries. This is most likely ok, because READ_CAPACITY_RETRIES_ON_RESET is already 10 and is not based on anything specific like a spec or device, so the extra 3 we got from the main loop was probably just an accident and is not going to help. Signed-off-by: Mike Christie --- drivers/scsi/sd.c | 108 ++++++++++++++++++++++++++++++---------------- 1 file changed, 71 insertions(+), 37 deletions(-) diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index fa00dd503cbf..1af04b01e1df 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -2453,55 +2453,89 @@ static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp, static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, unsigned char *buffer) { - unsigned char cmd[16]; - struct scsi_sense_hdr sshdr; - const struct scsi_exec_args exec_args = { - .sshdr = &sshdr, + static const u8 cmd[16] = { + [0] = SERVICE_ACTION_IN_16, + [1] = SAI_READ_CAPACITY_16, + [13] = RC16_LEN, }; + struct scsi_sense_hdr sshdr; int sense_valid = 0; int the_result; - int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET; unsigned int alignment; unsigned long long lba; unsigned sector_size; + struct scsi_failure failure_defs[] = { + /* + * Do not retry Invalid Command Operation Code or Invalid + * Field in CDB. + */ + { + .sense = ILLEGAL_REQUEST, + .asc = 0x20, + .result = SAM_STAT_CHECK_CONDITION, + }, + { + .sense = ILLEGAL_REQUEST, + .asc = 0x24, + .result = SAM_STAT_CHECK_CONDITION, + }, + /* Do not retry Medium Not Present */ + { + .sense = UNIT_ATTENTION, + .asc = 0x3A, + .result = SAM_STAT_CHECK_CONDITION, + }, + { + .sense = NOT_READY, + .asc = 0x3A, + .result = SAM_STAT_CHECK_CONDITION, + }, + /* Device reset might occur several times so retry a lot */ + { + .sense = UNIT_ATTENTION, + .asc = 0x29, + .allowed = READ_CAPACITY_RETRIES_ON_RESET, + .result = SAM_STAT_CHECK_CONDITION, + }, + /* Any other error not listed above retry 3 times */ + { + .result = SCMD_FAILURE_RESULT_ANY, + .allowed = 3, + }, + {} + }; + struct scsi_failures failures = { + .failure_definitions = failure_defs, + }; + const struct scsi_exec_args exec_args = { + .sshdr = &sshdr, + .failures = &failures, + }; if (sdp->no_read_capacity_16) return -EINVAL; - do { - memset(cmd, 0, 16); - cmd[0] = SERVICE_ACTION_IN_16; - cmd[1] = SAI_READ_CAPACITY_16; - cmd[13] = RC16_LEN; - memset(buffer, 0, RC16_LEN); - - the_result = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, - buffer, RC16_LEN, SD_TIMEOUT, - sdkp->max_retries, &exec_args); - if (the_result > 0) { - if (media_not_present(sdkp, &sshdr)) - return -ENODEV; + memset(buffer, 0, RC16_LEN); - sense_valid = scsi_sense_valid(&sshdr); - if (sense_valid && - sshdr.sense_key == ILLEGAL_REQUEST && - (sshdr.asc == 0x20 || sshdr.asc == 0x24) && - sshdr.ascq == 0x00) - /* Invalid Command Operation Code or - * Invalid Field in CDB, just retry - * silently with RC10 */ - return -EINVAL; - if (sense_valid && - sshdr.sense_key == UNIT_ATTENTION && - sshdr.asc == 0x29 && sshdr.ascq == 0x00) - /* Device reset might occur several times, - * give it one more chance */ - if (--reset_retries > 0) - continue; - } - retries--; + the_result = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, buffer, + RC16_LEN, SD_TIMEOUT, sdkp->max_retries, + &exec_args); - } while (the_result && retries); + if (the_result > 0) { + if (media_not_present(sdkp, &sshdr)) + return -ENODEV; + + sense_valid = scsi_sense_valid(&sshdr); + if (sense_valid && sshdr.sense_key == ILLEGAL_REQUEST && + (sshdr.asc == 0x20 || sshdr.asc == 0x24) && + sshdr.ascq == 0x00) { + /* + * Invalid Command Operation Code or Invalid Field in + * CDB, just retry silently with RC10 + */ + return -EINVAL; + } + } if (the_result) { sd_print_result(sdkp, "Read Capacity(16) failed", the_result);