From b1f707146923335849fb70237eec27d4d1ae7d62 Mon Sep 17 00:00:00 2001 From: Arun Easi Date: Tue, 12 Jul 2022 22:20:39 -0700 Subject: scsi: qla2xxx: Fix response queue handler reading stale packets On some platforms, the current logic of relying on finding new packet solely based on signature pattern can lead to driver reading stale packets. Though this is a bug in those platforms, reduce such exposures by limiting reading packets until the IN pointer. Two module parameters are introduced: ql2xrspq_follow_inptr: When set, on newer adapters that has queue pointer shadowing, look for response packets only until response queue in pointer. When reset, response packets are read based on a signature pattern logic (old way). ql2xrspq_follow_inptr_legacy: Like ql2xrspq_follow_inptr, but for those adapters where there is no queue pointer shadowing. Link: https://lore.kernel.org/r/20220713052045.10683-5-njavali@marvell.com Cc: stable@vger.kernel.org Reviewed-by: Himanshu Madhani Signed-off-by: Arun Easi Signed-off-by: Nilesh Javali Signed-off-by: Martin K. Petersen --- drivers/scsi/qla2xxx/qla_gbl.h | 2 ++ drivers/scsi/qla2xxx/qla_isr.c | 24 +++++++++++++++++++++++- drivers/scsi/qla2xxx/qla_os.c | 10 ++++++++++ 3 files changed, 35 insertions(+), 1 deletion(-) (limited to 'drivers/scsi') diff --git a/drivers/scsi/qla2xxx/qla_gbl.h b/drivers/scsi/qla2xxx/qla_gbl.h index 3674b35196b0..96147ca40126 100644 --- a/drivers/scsi/qla2xxx/qla_gbl.h +++ b/drivers/scsi/qla2xxx/qla_gbl.h @@ -193,6 +193,8 @@ extern int ql2xsecenable; extern int ql2xenforce_iocb_limit; extern int ql2xabts_wait_nvme; extern u32 ql2xnvme_queues; +extern int ql2xrspq_follow_inptr; +extern int ql2xrspq_follow_inptr_legacy; extern int qla2x00_loop_reset(scsi_qla_host_t *); extern void qla2x00_abort_all_cmds(scsi_qla_host_t *, int); diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c index 4fa24d318f14..35b425c446b9 100644 --- a/drivers/scsi/qla2xxx/qla_isr.c +++ b/drivers/scsi/qla2xxx/qla_isr.c @@ -3780,6 +3780,8 @@ void qla24xx_process_response_queue(struct scsi_qla_host *vha, struct qla_hw_data *ha = vha->hw; struct purex_entry_24xx *purex_entry; struct purex_item *pure_item; + u16 rsp_in = 0; + int follow_inptr, is_shadow_hba; if (!ha->flags.fw_started) return; @@ -3789,7 +3791,25 @@ void qla24xx_process_response_queue(struct scsi_qla_host *vha, qla_cpu_update(rsp->qpair, smp_processor_id()); } - while (rsp->ring_ptr->signature != RESPONSE_PROCESSED) { +#define __update_rsp_in(_update, _is_shadow_hba, _rsp, _rsp_in) \ + do { \ + if (_update) { \ + _rsp_in = _is_shadow_hba ? *(_rsp)->in_ptr : \ + rd_reg_dword_relaxed((_rsp)->rsp_q_in); \ + } \ + } while (0) + + is_shadow_hba = IS_SHADOW_REG_CAPABLE(ha); + follow_inptr = is_shadow_hba ? ql2xrspq_follow_inptr : + ql2xrspq_follow_inptr_legacy; + + __update_rsp_in(follow_inptr, is_shadow_hba, rsp, rsp_in); + + while ((likely(follow_inptr && + rsp->ring_index != rsp_in && + rsp->ring_ptr->signature != RESPONSE_PROCESSED)) || + (!follow_inptr && + rsp->ring_ptr->signature != RESPONSE_PROCESSED)) { pkt = (struct sts_entry_24xx *)rsp->ring_ptr; rsp->ring_index++; @@ -3902,6 +3922,8 @@ process_err: } pure_item = qla27xx_copy_fpin_pkt(vha, (void **)&pkt, &rsp); + __update_rsp_in(follow_inptr, is_shadow_hba, + rsp, rsp_in); if (!pure_item) break; qla24xx_queue_purex_item(vha, pure_item, diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c index 1c7fb6484db2..0bd0fd1042df 100644 --- a/drivers/scsi/qla2xxx/qla_os.c +++ b/drivers/scsi/qla2xxx/qla_os.c @@ -338,6 +338,16 @@ module_param(ql2xdelay_before_pci_error_handling, uint, 0644); MODULE_PARM_DESC(ql2xdelay_before_pci_error_handling, "Number of seconds delayed before qla begin PCI error self-handling (default: 5).\n"); +int ql2xrspq_follow_inptr = 1; +module_param(ql2xrspq_follow_inptr, int, 0644); +MODULE_PARM_DESC(ql2xrspq_follow_inptr, + "Follow RSP IN pointer for RSP updates for HBAs 27xx and newer (default: 1)."); + +int ql2xrspq_follow_inptr_legacy = 1; +module_param(ql2xrspq_follow_inptr_legacy, int, 0644); +MODULE_PARM_DESC(ql2xrspq_follow_inptr_legacy, + "Follow RSP IN pointer for RSP updates for HBAs older than 27XX. (default: 1)."); + static void qla2x00_clear_drv_active(struct qla_hw_data *); static void qla2x00_free_device(scsi_qla_host_t *); static int qla2xxx_map_queues(struct Scsi_Host *shost); -- cgit v1.2.3