scsi: lpfc: Fix FCP I/O flush functionality for TMF routines

A prior patch inadvertently caused lpfc_sli_sum_iocb() to exclude counting
of outstanding aborted I/Os and ABORT IOCBs.  Thus,
lpfc_reset_flush_io_context() called from any TMF routine does not properly
wait to flush all outstanding FCP IOCBs leading to a block layer crash on
an invalid scsi_cmnd->request pointer.

  kernel BUG at ../block/blk-core.c:1489!
  RIP: 0010:blk_requeue_request+0xaf/0xc0
  ...
  Call Trace:
  <IRQ>
  __scsi_queue_insert+0x90/0xe0 [scsi_mod]
  blk_done_softirq+0x7e/0x90
  __do_softirq+0xd2/0x280
  irq_exit+0xd5/0xe0
  do_IRQ+0x4c/0xd0
  common_interrupt+0x87/0x87
  </IRQ>

Fix by separating out the LPFC_IO_FCP, LPFC_IO_ON_TXCMPLQ,
LPFC_DRIVER_ABORTED, and CMD_ABORT_XRI_CN || CMD_CLOSE_XRI_CN checks into a
new lpfc_sli_validate_fcp_iocb_for_abort() routine when determining to
build an ABORT iocb.

Restore lpfc_reset_flush_io_context() functionality by including counting
of outstanding aborted IOCBs and ABORT IOCBs in lpfc_sli_sum_iocb().

Link: https://lore.kernel.org/r/20210910233159.115896-9-jsmart2021@gmail.com
Fixes: 26b078e807e6 ("scsi: lpfc: Fix illegal memory access on Abort IOCBs")
Cc: <stable@vger.kernel.org> # v5.12+
Co-developed-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index 546c851938bc07bb61f672407855765487360353..e8f6ad4847681c1f7a990486636631267a76e819 100644 (file)
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -12485,15 +12485,54 @@ lpfc_sli_hba_iocb_abort(struct lpfc_hba *phba)
 }
 
 /**
- * lpfc_sli_validate_fcp_iocb - find commands associated with a vport or LUN
+ * lpfc_sli_validate_fcp_iocb_for_abort - filter iocbs appropriate for FCP aborts
+ * @iocbq: Pointer to iocb object.
+ * @vport: Pointer to driver virtual port object.
+ *
+ * This function acts as an iocb filter for functions which abort FCP iocbs.
+ *
+ * Return values
+ * -ENODEV, if a null iocb or vport ptr is encountered
+ * -EINVAL, if the iocb is not an FCP I/O, not on the TX cmpl queue, premarked as
+ *          driver already started the abort process, or is an abort iocb itself
+ * 0, passes criteria for aborting the FCP I/O iocb
+ **/
+static int
+lpfc_sli_validate_fcp_iocb_for_abort(struct lpfc_iocbq *iocbq,
+                                    struct lpfc_vport *vport)
+{
+       IOCB_t *icmd = NULL;
+
+       /* No null ptr vports */
+       if (!iocbq || iocbq->vport != vport)
+               return -ENODEV;
+
+       /* iocb must be for FCP IO, already exists on the TX cmpl queue,
+        * can't be premarked as driver aborted, nor be an ABORT iocb itself
+        */
+       icmd = &iocbq->iocb;
+       if (!(iocbq->iocb_flag & LPFC_IO_FCP) ||
+           !(iocbq->iocb_flag & LPFC_IO_ON_TXCMPLQ) ||
+           (iocbq->iocb_flag & LPFC_DRIVER_ABORTED) ||
+           (icmd->ulpCommand == CMD_ABORT_XRI_CN ||
+            icmd->ulpCommand == CMD_CLOSE_XRI_CN))
+               return -EINVAL;
+
+       return 0;
+}
+
+/**
+ * lpfc_sli_validate_fcp_iocb - validate commands associated with a SCSI target
  * @iocbq: Pointer to driver iocb object.
  * @vport: Pointer to driver virtual port object.
  * @tgt_id: SCSI ID of the target.
  * @lun_id: LUN ID of the scsi device.
  * @ctx_cmd: LPFC_CTX_LUN/LPFC_CTX_TGT/LPFC_CTX_HOST
  *
- * This function acts as an iocb filter for functions which abort or count
- * all FCP iocbs pending on a lun/SCSI target/SCSI host. It will return
+ * This function acts as an iocb filter for validating a lun/SCSI target/SCSI
+ * host.
+ *
+ * It will return
  * 0 if the filtering criteria is met for the given iocb and will return
  * 1 if the filtering criteria is not met.
  * If ctx_cmd == LPFC_CTX_LUN, the function returns 0 only if the
@@ -12512,22 +12551,8 @@ lpfc_sli_validate_fcp_iocb(struct lpfc_iocbq *iocbq, struct lpfc_vport *vport,
                           lpfc_ctx_cmd ctx_cmd)
 {
        struct lpfc_io_buf *lpfc_cmd;
-       IOCB_t *icmd = NULL;
        int rc = 1;
 
-       if (!iocbq || iocbq->vport != vport)
-               return rc;
-
-       if (!(iocbq->iocb_flag & LPFC_IO_FCP) ||
-           !(iocbq->iocb_flag & LPFC_IO_ON_TXCMPLQ) ||
-             iocbq->iocb_flag & LPFC_DRIVER_ABORTED)
-               return rc;
-
-       icmd = &iocbq->iocb;
-       if (icmd->ulpCommand == CMD_ABORT_XRI_CN ||
-           icmd->ulpCommand == CMD_CLOSE_XRI_CN)
-               return rc;
-
        lpfc_cmd = container_of(iocbq, struct lpfc_io_buf, cur_iocbq);
 
        if (lpfc_cmd->pCmd == NULL)
@@ -12582,17 +12607,33 @@ lpfc_sli_sum_iocb(struct lpfc_vport *vport, uint16_t tgt_id, uint64_t lun_id,
 {
        struct lpfc_hba *phba = vport->phba;
        struct lpfc_iocbq *iocbq;
+       IOCB_t *icmd = NULL;
        int sum, i;
+       unsigned long iflags;
 
-       spin_lock_irq(&phba->hbalock);
+       spin_lock_irqsave(&phba->hbalock, iflags);
        for (i = 1, sum = 0; i <= phba->sli.last_iotag; i++) {
                iocbq = phba->sli.iocbq_lookup[i];
 
-               if (lpfc_sli_validate_fcp_iocb (iocbq, vport, tgt_id, lun_id,
-                                               ctx_cmd) == 0)
+               if (!iocbq || iocbq->vport != vport)
+                       continue;
+               if (!(iocbq->iocb_flag & LPFC_IO_FCP) ||
+                   !(iocbq->iocb_flag & LPFC_IO_ON_TXCMPLQ))
+                       continue;
+
+               /* Include counting outstanding aborts */
+               icmd = &iocbq->iocb;
+               if (icmd->ulpCommand == CMD_ABORT_XRI_CN ||
+                   icmd->ulpCommand == CMD_CLOSE_XRI_CN) {
+                       sum++;
+                       continue;
+               }
+
+               if (lpfc_sli_validate_fcp_iocb(iocbq, vport, tgt_id, lun_id,
+                                              ctx_cmd) == 0)
                        sum++;
        }
-       spin_unlock_irq(&phba->hbalock);
+       spin_unlock_irqrestore(&phba->hbalock, iflags);
 
        return sum;
 }
@@ -12659,7 +12700,11 @@ lpfc_sli_abort_fcp_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
  *
  * This function sends an abort command for every SCSI command
  * associated with the given virtual port pending on the ring
- * filtered by lpfc_sli_validate_fcp_iocb function.
+ * filtered by lpfc_sli_validate_fcp_iocb_for_abort and then
+ * lpfc_sli_validate_fcp_iocb function.  The ordering for validation before
+ * submitting abort iocbs must be lpfc_sli_validate_fcp_iocb_for_abort
+ * followed by lpfc_sli_validate_fcp_iocb.
+ *
  * When abort_cmd == LPFC_CTX_LUN, the function sends abort only to the
  * FCP iocbs associated with lun specified by tgt_id and lun_id
  * parameters
@@ -12691,6 +12736,9 @@ lpfc_sli_abort_iocb(struct lpfc_vport *vport, u16 tgt_id, u64 lun_id,
        for (i = 1; i <= phba->sli.last_iotag; i++) {
                iocbq = phba->sli.iocbq_lookup[i];
 
+               if (lpfc_sli_validate_fcp_iocb_for_abort(iocbq, vport))
+                       continue;
+
                if (lpfc_sli_validate_fcp_iocb(iocbq, vport, tgt_id, lun_id,
                                               abort_cmd) != 0)
                        continue;
@@ -12723,7 +12771,11 @@ lpfc_sli_abort_iocb(struct lpfc_vport *vport, u16 tgt_id, u64 lun_id,
  *
  * This function sends an abort command for every SCSI command
  * associated with the given virtual port pending on the ring
- * filtered by lpfc_sli_validate_fcp_iocb function.
+ * filtered by lpfc_sli_validate_fcp_iocb_for_abort and then
+ * lpfc_sli_validate_fcp_iocb function.  The ordering for validation before
+ * submitting abort iocbs must be lpfc_sli_validate_fcp_iocb_for_abort
+ * followed by lpfc_sli_validate_fcp_iocb.
+ *
  * When taskmgmt_cmd == LPFC_CTX_LUN, the function sends abort only to the
  * FCP iocbs associated with lun specified by tgt_id and lun_id
  * parameters
@@ -12761,6 +12813,9 @@ lpfc_sli_abort_taskmgmt(struct lpfc_vport *vport, struct lpfc_sli_ring *pring,
        for (i = 1; i <= phba->sli.last_iotag; i++) {
                iocbq = phba->sli.iocbq_lookup[i];
 
+               if (lpfc_sli_validate_fcp_iocb_for_abort(iocbq, vport))
+                       continue;
+
                if (lpfc_sli_validate_fcp_iocb(iocbq, vport, tgt_id, lun_id,
                                               cmd) != 0)
                        continue;