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 {
--
2.23.1
