| Message ID | 20220303140203.12642-1-sreekanth.reddy@broadcom.com (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
| Series | mpt3sas: Remove scsi_dma_map errors messages | expand |
Sreekanth, > When scsi_dma_map() fails by returning a sges_left value less than > zero, the amount of logging can be extremely high. In a recent > end-user environment, 1200 messages per second were being sent to the > log buffer. This eventually overwhelmed the system and it > stalled. Also these error messages are not needed and hence removing > them. Applied to 5.18/scsi-staging, thanks!
On Thu, 3 Mar 2022 19:32:03 +0530, Sreekanth Reddy wrote: > When scsi_dma_map() fails by returning a sges_left value less than > zero, the amount of logging can be extremely high. In a recent > end-user environment, 1200 messages per second were being sent to > the log buffer. This eventually overwhelmed the system and it > stalled. Also these error messages are not needed and hence > removing them. > > [...] Applied to 5.18/scsi-queue, thanks! [1/1] mpt3sas: Remove scsi_dma_map errors messages https://git.kernel.org/mkp/scsi/c/0c25422d34b4
Hi, please excuse a probably naive question: Why can't this result in errors being silently ignored? Most callers of `_base_build_sg` via `ioc->build_sg()` seem to ignore the return value. I assume, this is not a problem, but a short confirmation would be very much appreciated. Thanks Donald On 3/3/22 3:02 PM, Sreekanth Reddy wrote: > When scsi_dma_map() fails by returning a sges_left value less than > zero, the amount of logging can be extremely high. In a recent > end-user environment, 1200 messages per second were being sent to > the log buffer. This eventually overwhelmed the system and it > stalled. Also these error messages are not needed and hence > removing them. > > Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com> > --- > drivers/scsi/mpt3sas/mpt3sas_base.c | 18 +++--------------- > 1 file changed, 3 insertions(+), 15 deletions(-) > > diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c > index 511726f92d9a..ebb61b47dc2f 100644 > --- a/drivers/scsi/mpt3sas/mpt3sas_base.c > +++ b/drivers/scsi/mpt3sas/mpt3sas_base.c > @@ -2593,12 +2593,8 @@ _base_check_pcie_native_sgl(struct MPT3SAS_ADAPTER *ioc, > > /* Get the SG list pointer and info. */ > sges_left = scsi_dma_map(scmd); > - if (sges_left < 0) { > - sdev_printk(KERN_ERR, scmd->device, > - "scsi_dma_map failed: request for %d bytes!\n", > - scsi_bufflen(scmd)); > + if (sges_left < 0) > return 1; > - } > > /* Check if we need to build a native SG list. */ > if (!base_is_prp_possible(ioc, pcie_device, > @@ -2705,12 +2701,8 @@ _base_build_sg_scmd(struct MPT3SAS_ADAPTER *ioc, > > sg_scmd = scsi_sglist(scmd); > sges_left = scsi_dma_map(scmd); > - if (sges_left < 0) { > - sdev_printk(KERN_ERR, scmd->device, > - "scsi_dma_map failed: request for %d bytes!\n", > - scsi_bufflen(scmd)); > + if (sges_left < 0) > return -ENOMEM; > - } > > sg_local = &mpi_request->SGL; > sges_in_segment = ioc->max_sges_in_main_message; > @@ -2853,12 +2845,8 @@ _base_build_sg_scmd_ieee(struct MPT3SAS_ADAPTER *ioc, > > sg_scmd = scsi_sglist(scmd); > sges_left = scsi_dma_map(scmd); > - if (sges_left < 0) { > - sdev_printk(KERN_ERR, scmd->device, > - "scsi_dma_map failed: request for %d bytes!\n", > - scsi_bufflen(scmd)); > + if (sges_left < 0) > return -ENOMEM; > - } > > sg_local = &mpi_request->SGL; > sges_in_segment = (ioc->request_sz - >
diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c index 511726f92d9a..ebb61b47dc2f 100644 --- a/drivers/scsi/mpt3sas/mpt3sas_base.c +++ b/drivers/scsi/mpt3sas/mpt3sas_base.c @@ -2593,12 +2593,8 @@ _base_check_pcie_native_sgl(struct MPT3SAS_ADAPTER *ioc, /* Get the SG list pointer and info. */ sges_left = scsi_dma_map(scmd); - if (sges_left < 0) { - sdev_printk(KERN_ERR, scmd->device, - "scsi_dma_map failed: request for %d bytes!\n", - scsi_bufflen(scmd)); + if (sges_left < 0) return 1; - } /* Check if we need to build a native SG list. */ if (!base_is_prp_possible(ioc, pcie_device, @@ -2705,12 +2701,8 @@ _base_build_sg_scmd(struct MPT3SAS_ADAPTER *ioc, sg_scmd = scsi_sglist(scmd); sges_left = scsi_dma_map(scmd); - if (sges_left < 0) { - sdev_printk(KERN_ERR, scmd->device, - "scsi_dma_map failed: request for %d bytes!\n", - scsi_bufflen(scmd)); + if (sges_left < 0) return -ENOMEM; - } sg_local = &mpi_request->SGL; sges_in_segment = ioc->max_sges_in_main_message; @@ -2853,12 +2845,8 @@ _base_build_sg_scmd_ieee(struct MPT3SAS_ADAPTER *ioc, sg_scmd = scsi_sglist(scmd); sges_left = scsi_dma_map(scmd); - if (sges_left < 0) { - sdev_printk(KERN_ERR, scmd->device, - "scsi_dma_map failed: request for %d bytes!\n", - scsi_bufflen(scmd)); + if (sges_left < 0) return -ENOMEM; - } sg_local = &mpi_request->SGL; sges_in_segment = (ioc->request_sz -
When scsi_dma_map() fails by returning a sges_left value less than zero, the amount of logging can be extremely high. In a recent end-user environment, 1200 messages per second were being sent to the log buffer. This eventually overwhelmed the system and it stalled. Also these error messages are not needed and hence removing them. Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com> --- drivers/scsi/mpt3sas/mpt3sas_base.c | 18 +++--------------- 1 file changed, 3 insertions(+), 15 deletions(-)