On Fri, 2023-08-04 at 12:49 +0530, Nilesh Javali wrote:
> From: Quinn Tran <qutran@xxxxxxxxxxx>
>
> System crash when 32 bytes CDB was sent to a non T10-PI disk,
>
> [ 177.143279] ? qla2xxx_dif_start_scsi_mq+0xcd8/0xce0 [qla2xxx]
> [ 177.149165] ? internal_add_timer+0x42/0x70
> [ 177.153372] qla2xxx_mqueuecommand+0x207/0x2b0 [qla2xxx]
> [ 177.158730] scsi_queue_rq+0x2b7/0xc00
> [ 177.162501] blk_mq_dispatch_rq_list+0x3ea/0x7e0
>
> Current code attempt to use CRC IOCB to send the command but failed.
> Instead, type 6 IOCB should be used to send the IO.
>
> Clone existing type 6 IOCB code with addition of MQ support
> to allow 32 bytes CDB to go through.
>
> Signed-off-by: Quinn Tran <qutran@xxxxxxxxxxx>
> Cc: Laurence Oberman <loberman@xxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Nilesh Javali <njavali@xxxxxxxxxxx>
> ---
> drivers/scsi/qla2xxx/qla_iocb.c | 270
> ++++++++++++++++++++++++++++++++
> drivers/scsi/qla2xxx/qla_nx.h | 4 +-
> 2 files changed, 273 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/qla2xxx/qla_iocb.c
> b/drivers/scsi/qla2xxx/qla_iocb.c
> index 0caa64a7df26..e99ebf7e1c7a 100644
> --- a/drivers/scsi/qla2xxx/qla_iocb.c
> +++ b/drivers/scsi/qla2xxx/qla_iocb.c
> @@ -11,6 +11,7 @@
>
> #include <scsi/scsi_tcq.h>
>
> +static int qla_start_scsi_type6(srb_t *sp);
> /**
> * qla2x00_get_cmd_direction() - Determine control_flag data
> direction.
> * @sp: SCSI command
> @@ -1721,6 +1722,8 @@ qla24xx_dif_start_scsi(srb_t *sp)
> if (scsi_get_prot_op(cmd) == SCSI_PROT_NORMAL) {
> if (cmd->cmd_len <= 16)
> return qla24xx_start_scsi(sp);
> + else
> + return qla_start_scsi_type6(sp);
> }
>
> /* Setup device pointers. */
> @@ -2100,6 +2103,8 @@ qla2xxx_dif_start_scsi_mq(srb_t *sp)
> if (scsi_get_prot_op(cmd) == SCSI_PROT_NORMAL) {
> if (cmd->cmd_len <= 16)
> return qla2xxx_start_scsi_mq(sp);
> + else
> + return qla_start_scsi_type6(sp);
> }
>
> spin_lock_irqsave(&qpair->qp_lock, flags);
> @@ -4205,3 +4210,268 @@ qla2x00_start_bidir(srb_t *sp, struct
> scsi_qla_host *vha, uint32_t tot_dsds)
>
> return rval;
> }
> +
> +/**
> + * qla_start_scsi_type6() - Send a SCSI command to the ISP
> + * @sp: command to send to the ISP
> + *
> + * Returns non-zero if a failure occurred, else zero.
> + */
> +static int
> +qla_start_scsi_type6(srb_t *sp)
> +{
> + int nseg;
> + unsigned long flags;
> + uint32_t *clr_ptr;
> + uint32_t handle;
> + struct cmd_type_6 *cmd_pkt;
> + uint16_t cnt;
> + uint16_t req_cnt;
> + uint16_t tot_dsds;
> + struct req_que *req = NULL;
> + struct rsp_que *rsp;
> + struct scsi_cmnd *cmd = GET_CMD_SP(sp);
> + struct scsi_qla_host *vha = sp->fcport->vha;
> + struct qla_hw_data *ha = vha->hw;
> + struct qla_qpair *qpair = sp->qpair;
> + uint16_t more_dsd_lists = 0;
> + struct dsd_dma *dsd_ptr;
> + uint16_t i;
> + __be32 *fcp_dl;
> + uint8_t additional_cdb_len;
> + struct ct6_dsd *ctx;
> +
> +
> + /* Acquire qpair specific lock */
> + spin_lock_irqsave(&qpair->qp_lock, flags);
> +
> + /* Setup qpair pointers */
> + req = qpair->req;
> + rsp = qpair->rsp;
> +
> + /* So we know we haven't pci_map'ed anything yet */
> + tot_dsds = 0;
> +
> + /* Send marker if required */
> + if (vha->marker_needed != 0) {
> + if (__qla2x00_marker(vha, qpair, 0, 0, MK_SYNC_ALL)
> != QLA_SUCCESS) {
> + spin_unlock_irqrestore(&qpair->qp_lock,
> flags);
> + return QLA_FUNCTION_FAILED;
> + }
> + vha->marker_needed = 0;
> + }
> +
> + handle = qla2xxx_get_next_handle(req);
> + if (handle == 0)
> + goto queuing_error;
> +
> + /* Map the sg table so we have an accurate count of sg
> entries needed */
> + if (scsi_sg_count(cmd)) {
> + nseg = dma_map_sg(&ha->pdev->dev, scsi_sglist(cmd),
> + scsi_sg_count(cmd), cmd-
> >sc_data_direction);
> + if (unlikely(!nseg))
> + goto queuing_error;
> + } else {
> + nseg = 0;
> + }
> +
> + tot_dsds = nseg;
> +
> + /* eventhough driver only need 1 T6 IOCB, FW still convert
> DSD to Continueation IOCB */
> + req_cnt = qla24xx_calc_iocbs(vha, tot_dsds);
> +
> + sp->iores.res_type = RESOURCE_IOCB | RESOURCE_EXCH;
> + sp->iores.exch_cnt = 1;
> + sp->iores.iocb_cnt = req_cnt;
> +
> + if (qla_get_fw_resources(sp->qpair, &sp->iores))
> + goto queuing_error;
> +
> + more_dsd_lists = qla24xx_calc_dsd_lists(tot_dsds);
> + if ((more_dsd_lists + qpair->dsd_inuse) >= NUM_DSD_CHAIN) {
> + ql_dbg(ql_dbg_io, vha, 0x3028,
> + "Num of DSD list %d is than %d for cmd=%p.\n",
> + more_dsd_lists + qpair->dsd_inuse,
> NUM_DSD_CHAIN, cmd);
> + goto queuing_error;
> + }
> +
> + if (more_dsd_lists <= qpair->dsd_avail)
> + goto sufficient_dsds;
> + else
> + more_dsd_lists -= qpair->dsd_avail;
> +
> + for (i = 0; i < more_dsd_lists; i++) {
> + dsd_ptr = kzalloc(sizeof(*dsd_ptr), GFP_ATOMIC);
> + if (!dsd_ptr) {
> + ql_log(ql_log_fatal, vha, 0x3029,
> + "Failed to allocate memory for dsd_dma
> for cmd=%p.\n", cmd);
> + goto queuing_error;
> + }
> + INIT_LIST_HEAD(&dsd_ptr->list);
> +
> + dsd_ptr->dsd_addr = dma_pool_alloc(ha->dl_dma_pool,
> + GFP_ATOMIC, &dsd_ptr->dsd_list_dma);
> + if (!dsd_ptr->dsd_addr) {
> + kfree(dsd_ptr);
> + ql_log(ql_log_fatal, vha, 0x302a,
> + "Failed to allocate memory for dsd_addr
> for cmd=%p.\n", cmd);
> + goto queuing_error;
> + }
> + list_add_tail(&dsd_ptr->list, &qpair->dsd_list);
> + qpair->dsd_avail++;
> + }
> +
> +sufficient_dsds:
> + req_cnt = 1;
> +
> + if (req->cnt < (req_cnt + 2)) {
> + if (IS_SHADOW_REG_CAPABLE(ha)) {
> + cnt = *req->out_ptr;
> + } else {
> + cnt = (uint16_t)rd_reg_dword_relaxed(req-
> >req_q_out);
> + if (qla2x00_check_reg16_for_disconnect(vha,
> cnt))
> + goto queuing_error;
> + }
> +
> + if (req->ring_index < cnt)
> + req->cnt = cnt - req->ring_index;
> + else
> + req->cnt = req->length - (req->ring_index -
> cnt);
> + if (req->cnt < (req_cnt + 2))
> + goto queuing_error;
> + }
> +
> + ctx = &sp->u.scmd.ct6_ctx;
> +
> + memset(ctx, 0, sizeof(struct ct6_dsd));
> + ctx->fcp_cmnd = dma_pool_zalloc(ha->fcp_cmnd_dma_pool,
> + GFP_ATOMIC, &ctx->fcp_cmnd_dma);
> + if (!ctx->fcp_cmnd) {
> + ql_log(ql_log_fatal, vha, 0x3031,
> + "Failed to allocate fcp_cmnd for cmd=%p.\n",
> cmd);
> + goto queuing_error;
> + }
> +
> + /* Initialize the DSD list and dma handle */
> + INIT_LIST_HEAD(&ctx->dsd_list);
> + ctx->dsd_use_cnt = 0;
> +
> + if (cmd->cmd_len > 16) {
> + additional_cdb_len = cmd->cmd_len - 16;
> + if (cmd->cmd_len % 4 ||
> + cmd->cmd_len > QLA_CDB_BUF_SIZE) {
> + /* SCSI command bigger than 16 bytes must be
> + * multiple of 4 or too big.
> + */
> + ql_log(ql_log_warn, vha, 0x3033,
> + "scsi cmd len %d not multiple of 4 for
> cmd=%p.\n",
> + cmd->cmd_len, cmd);
> + goto queuing_error_fcp_cmnd;
> + }
> + ctx->fcp_cmnd_len = 12 + cmd->cmd_len + 4;
> + } else {
> + additional_cdb_len = 0;
> + ctx->fcp_cmnd_len = 12 + 16 + 4;
> + }
> +
> + /* Build command packet. */
> + req->current_outstanding_cmd = handle;
> + req->outstanding_cmds[handle] = sp;
> + sp->handle = handle;
> + cmd->host_scribble = (unsigned char *)(unsigned long)handle;
> + req->cnt -= req_cnt;
> +
> + cmd_pkt = (struct cmd_type_6 *)req->ring_ptr;
> + cmd_pkt->handle = make_handle(req->id, handle);
> +
> + /* Zero out remaining portion of packet. */
> + /* tagged queuing modifier -- default is TSK_SIMPLE (0).
> */
> + clr_ptr = (uint32_t *)cmd_pkt + 2;
> + memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
> + cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
> +
> + /* Set NPORT-ID and LUN number*/
> + cmd_pkt->nport_handle = cpu_to_le16(sp->fcport->loop_id);
> + cmd_pkt->port_id[0] = sp->fcport->d_id.b.al_pa;
> + cmd_pkt->port_id[1] = sp->fcport->d_id.b.area;
> + cmd_pkt->port_id[2] = sp->fcport->d_id.b.domain;
> + cmd_pkt->vp_index = sp->vha->vp_idx;
> +
> + /* Build IOCB segments */
> + qla24xx_build_scsi_type_6_iocbs(sp, cmd_pkt, tot_dsds);
> +
> + int_to_scsilun(cmd->device->lun, &cmd_pkt->lun);
> + host_to_fcp_swap((uint8_t *)&cmd_pkt->lun, sizeof(cmd_pkt-
> >lun));
> +
> + /* build FCP_CMND IU */
> + int_to_scsilun(cmd->device->lun, &ctx->fcp_cmnd->lun);
> + ctx->fcp_cmnd->additional_cdb_len = additional_cdb_len;
> +
> + if (cmd->sc_data_direction == DMA_TO_DEVICE)
> + ctx->fcp_cmnd->additional_cdb_len |= 1;
> + else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
> + ctx->fcp_cmnd->additional_cdb_len |= 2;
> +
> + /* Populate the FCP_PRIO. */
> + if (ha->flags.fcp_prio_enabled)
> + ctx->fcp_cmnd->task_attribute |=
> + sp->fcport->fcp_prio << 3;
> +
> + memcpy(ctx->fcp_cmnd->cdb, cmd->cmnd, cmd->cmd_len);
> +
> + fcp_dl = (__be32 *)(ctx->fcp_cmnd->cdb + 16 +
> + additional_cdb_len);
> + *fcp_dl = htonl((uint32_t)scsi_bufflen(cmd));
> +
> + cmd_pkt->fcp_cmnd_dseg_len = cpu_to_le16(ctx->fcp_cmnd_len);
> + put_unaligned_le64(ctx->fcp_cmnd_dma,
> + &cmd_pkt->fcp_cmnd_dseg_address);
> +
> + sp->flags |= SRB_FCP_CMND_DMA_VALID;
> + cmd_pkt->byte_count =
> cpu_to_le32((uint32_t)scsi_bufflen(cmd));
> + /* Set total data segment count. */
> + cmd_pkt->entry_count = (uint8_t)req_cnt;
> +
> + wmb();
> + /* Adjust ring index. */
> + req->ring_index++;
> + if (req->ring_index == req->length) {
> + req->ring_index = 0;
> + req->ring_ptr = req->ring;
> + } else {
> + req->ring_ptr++;
> + }
> +
> + sp->qpair->cmd_cnt++;
> + sp->flags |= SRB_DMA_VALID;
> +
> + /* Set chip new ring index. */
> + wrt_reg_dword(req->req_q_in, req->ring_index);
> +
> + /* Manage unprocessed RIO/ZIO commands in response queue. */
> + if (vha->flags.process_response_queue &&
> + rsp->ring_ptr->signature != RESPONSE_PROCESSED)
> + qla24xx_process_response_queue(vha, rsp);
> +
> + spin_unlock_irqrestore(&qpair->qp_lock, flags);
> +
> + return QLA_SUCCESS;
> +
> +queuing_error_fcp_cmnd:
> + dma_pool_free(ha->fcp_cmnd_dma_pool, ctx->fcp_cmnd, ctx-
> >fcp_cmnd_dma);
> +
> +queuing_error:
> + if (tot_dsds)
> + scsi_dma_unmap(cmd);
> +
> + qla_put_fw_resources(sp->qpair, &sp->iores);
> +
> + if (sp->u.scmd.crc_ctx) {
> + mempool_free(sp->u.scmd.crc_ctx, ha->ctx_mempool);
> + sp->u.scmd.crc_ctx = NULL;
> + }
> +
> + spin_unlock_irqrestore(&qpair->qp_lock, flags);
> +
> + return QLA_FUNCTION_FAILED;
> +}
> diff --git a/drivers/scsi/qla2xxx/qla_nx.h
> b/drivers/scsi/qla2xxx/qla_nx.h
> index 6dc80c8ddf79..5d1bdc15b75c 100644
> --- a/drivers/scsi/qla2xxx/qla_nx.h
> +++ b/drivers/scsi/qla2xxx/qla_nx.h
> @@ -857,7 +857,9 @@ struct fcp_cmnd {
> uint8_t task_attribute;
> uint8_t task_management;
> uint8_t additional_cdb_len;
> - uint8_t cdb[260]; /* 256 for CDB len and 4 for FCP_DL */
> +#define QLA_CDB_BUF_SIZE 256
> +#define QLA_FCP_DL_SIZE 4
> + uint8_t cdb[QLA_CDB_BUF_SIZE + QLA_FCP_DL_SIZE]; /* 256 for
> CDB len and 4 for FCP_DL */
> };
>
> struct dsd_dma {
QT and Nilesh, Thank you.
I need more time to look at this fully but I will get it tested in the
meantime.
I will reply with a review or questions later.
Thanks for sending this
Laurence
