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scsi: mpi3mr: Hardware workaround for UNMAP commands to NVMe drives

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The controller hardware can not handle certain UNMAP commands for NVMe
drives. Add support in the driver for checking those commands and handle
them appropriately.

Link: https://lore.kernel.org/r/20210520152545.2710479-17-kashyap.desai@broadcom.com
Cc: sathya.prakash@broadcom.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Kashyap Desai 2021-05-20 20:55:37 +05:30 • committed by Martin K. Petersen
parent 82141ddba9
commit 392bbeb85b
1 changed files with 100 additions and 0 deletions

100
drivers/scsi/mpi3mr/mpi3mr_os.c
View file

@ -2767,6 +2767,101 @@ static int mpi3mr_target_alloc(struct scsi_target *starget)
return retval;
}
/**
* mpi3mr_check_return_unmap - Whether an unmap is allowed
* @mrioc: Adapter instance reference
* @scmd: SCSI Command reference
*
* The controller hardware cannot handle certain unmap commands
* for NVMe drives, this routine checks those and return true
* and completes the SCSI command with proper status and sense
* data.
*
* Return: TRUE for not allowed unmap, FALSE otherwise.
*/
static bool mpi3mr_check_return_unmap(struct mpi3mr_ioc *mrioc,
struct scsi_cmnd *scmd)
{
unsigned char *buf;
u16 param_len, desc_len;
param_len = get_unaligned_be16(scmd->cmnd + 7);
if (!param_len) {
ioc_warn(mrioc,
"%s: cdb received with zero parameter length\n",
__func__);
scsi_print_command(scmd);
scmd->result = DID_OK << 16;
scmd->scsi_done(scmd);
return true;
}
if (param_len < 24) {
ioc_warn(mrioc,
"%s: cdb received with invalid param_len: %d\n",
__func__, param_len);
scsi_print_command(scmd);
scmd->result = (DRIVER_SENSE << 24) |
SAM_STAT_CHECK_CONDITION;
scsi_build_sense_buffer(0, scmd->sense_buffer, ILLEGAL_REQUEST,
0x1A, 0);
scmd->scsi_done(scmd);
return true;
}
if (param_len != scsi_bufflen(scmd)) {
ioc_warn(mrioc,
"%s: cdb received with param_len: %d bufflen: %d\n",
__func__, param_len, scsi_bufflen(scmd));
scsi_print_command(scmd);
scmd->result = (DRIVER_SENSE << 24) |
SAM_STAT_CHECK_CONDITION;
scsi_build_sense_buffer(0, scmd->sense_buffer, ILLEGAL_REQUEST,
0x1A, 0);
scmd->scsi_done(scmd);
return true;
}
buf = kzalloc(scsi_bufflen(scmd), GFP_ATOMIC);
if (!buf) {
scsi_print_command(scmd);
scmd->result = (DRIVER_SENSE << 24) |
SAM_STAT_CHECK_CONDITION;
scsi_build_sense_buffer(0, scmd->sense_buffer, ILLEGAL_REQUEST,
0x55, 0x03);
scmd->scsi_done(scmd);
return true;
}
scsi_sg_copy_to_buffer(scmd, buf, scsi_bufflen(scmd));
desc_len = get_unaligned_be16(&buf[2]);
if (desc_len < 16) {
ioc_warn(mrioc,
"%s: Invalid descriptor length in param list: %d\n",
__func__, desc_len);
scsi_print_command(scmd);
scmd->result = (DRIVER_SENSE << 24) |
SAM_STAT_CHECK_CONDITION;
scsi_build_sense_buffer(0, scmd->sense_buffer, ILLEGAL_REQUEST,
0x26, 0);
scmd->scsi_done(scmd);
kfree(buf);
return true;
}
if (param_len > (desc_len + 8)) {
scsi_print_command(scmd);
ioc_warn(mrioc,
"%s: Truncating param_len(%d) to desc_len+8(%d)\n",
__func__, param_len, (desc_len + 8));
param_len = desc_len + 8;
put_unaligned_be16(param_len, scmd->cmnd + 7);
scsi_print_command(scmd);
}
kfree(buf);
return false;
}
/**
* mpi3mr_allow_scmd_to_fw - Command is allowed during shutdown
* @scmd: SCSI Command reference
@ -2858,6 +2953,11 @@ static int mpi3mr_qcmd(struct Scsi_Host *shost,
goto out;
}
if ((scmd->cmnd[0] == UNMAP) &&
(stgt_priv_data->dev_type == MPI3_DEVICE_DEVFORM_PCIE) &&
mpi3mr_check_return_unmap(mrioc, scmd))
goto out;
host_tag = mpi3mr_host_tag_for_scmd(mrioc, scmd);
if (host_tag == MPI3MR_HOSTTAG_INVALID) {
scmd->result = DID_ERROR << 16;