[PATCH v4 16/24] mpi3mr: hardware workaround for UNMAP commands to nvme drives

Kashyap Desai
2021-05-11T19:52:18Z

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The controller hardware can not handle certain unmap commands for NVMe
drives, this patch adds support in the driver to check those commands and
handle as appropriate.

Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>

Cc: sathya.prakash@broadcom.com
---
drivers/scsi/mpi3mr/mpi3mr_os.c | 100 ++++++++++++++++++++++++++++++++
1 file changed, 100 insertions(+)

diff --git a/drivers/scsi/mpi3mr/mpi3mr_os.c b/drivers/scsi/mpi3mr/mpi3mr_os.c
index 992a0e4d37d1..ad3390e02034 100644
--- a/drivers/scsi/mpi3mr/mpi3mr_os.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_os.c
@@ -2776,6 +2776,101 @@ 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
@@ -2867,6 +2962,11 @@ 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;