No, the hard reset can't be removed. If your controller ever goes into FAULT state, only the hard reset will recover it. The soft reset is unable to recover a card in fault. I have an application I can send you that will put a card into FAULT. Please let me know. regarding multifunction card, you can figure this out using lspci, also when the driver loads, you will have an ioc0 and ioc1 assigned to a single controller. Here is an example of 53C1030 dual function card. Notice 03:01.0 is the 1st function, and 03:01.1 is the 2nd function. 03:01.0 SCSI storage controller: LSI Logic / Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ultra320 SCSI (rev 07) 03:01.1 SCSI storage controller: LSI Logic / Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ultra320 SCSI (rev 07) Here is an example of Fibre Channel dual function card. Notice 04:02.0 is the 1st function, and 04:02.1 is the 2nd function. 04:02.0 Fibre Channel: LSI Logic / Symbios Logic FC929X Fibre Channel Adapter (rev 80) 04:02.1 Fibre Channel: LSI Logic / Symbios Logic FC929X Fibre Channel Adapter (rev 80) Eric Bernd Schubert wrote: > > I am open to other ideas, of course. Here a few notes: > > I didn't entirely remove the hard reset handler. It is only > remove for 53C1030 > based chips. Though, I'm not entire sure, if struct _MPT_ADAPTER is > initialized with zeros for FC and SAS cards. If not, we need > to fix the patch > to set ioc->no_hard_reset=0 on these. If you look at the > patch, you will see > one **needs** to set ioc->no_hard_reset=1 to disable the hard > reset handler. > Furthermore, the hard resets are *only* disabled, when there > is an alt_ioc > with connected devices. > So I already tried my best not break other customers. If you > think the tests > still need to be extended, please tell me what needs to be done. > > I guess you count the LSI22320R HBA as "multifunction card"? > This is the card > I wrote the patches for, since the way the hard reset handler > destroys the > operational state of the second port is simply not > acceptable. Basically what > happens is the following: > > 1) scsi error handler activates the fusion reset handler > > 2) The port of the LSI22320R which the hard reset handler was > activated for > recovers properly. However, now devices on the second port of this HBA > suddenly fail with DID_SOFT_ERROR ==> Goto 1) > > 3) Eventually the chip is in such a bad state by a number of > hard resets, that > even the hard reset handler fails ==> devices on both ports > are offlined > > If you are 'luckily' the ping-pong of hard resets may last > for hours, please > see my messages to scsi list back in December. I have some > generic (not yet > posted) scsi-error patches here, which will at least limit > the maximum number > of failures within a given time frame and then offline the device. > > Of course, it would be optimal to make the hard reset handler > not to cause > errors on the second port. If you have an idea how to archieve this, I > absolutely open for this perfect solution. > > Do you have an example of multifunction 53C1030 cards, of > which you know the > hard resets won't trouble? Working for a small mostly hardware selling > company, I don't have the possibilty to test all of your > hardware, but on the > other hand I now tested the LSI22320R for weeks. And it > definitely works > better without the hardware reset handler... > > > Cheers, > Bernd > > > > On Tuesday 07 October 2008 18:25:35 Moore, Eric wrote: > > Bernd - No we can not remove the hard reset from the code. > Your going to > > break a whole lot of customers. The hard reset is a > "start of day" big > > hammer reset, where the controller firmware is reloaded. > The soft reset is > > not doing a 'start of day"reset, hence why its called soft > reset. The soft > > reset will only reset a single function of the controller, > and not effect > > the other function. Firmware is not reloaded in the case > of soft reset. > > We have several multifunction cards like the 53c1030 > ULTRA320 controller, > > and several in a line of the Fibre Channel Cards. The > soft reset added to > > address some problems with timeouts on one channel > resulting in host reset > > being called, and when you did that it would kill all the > IO on the other > > channel, resulting in timeouts on the other channel. So > adding the soft > > reset prevented the other channel from being effected. > In some cases the > > soft reset doesnt not recover the card, we need the bigg > hammer to do a > > "start of day recovery" The ioc->alt_ioc pointer is used > in the case of > > multifunction card, where one function is pointing to the > other. There are > > cases where we need to be aware of the other controller, > for instanced some > > controllers require that firmware be uploaded into driver > memory ,and when > > ever we unload the driver, we can only download the image > back on one > > function (not both). > > > > Eric > > > > On Tuesday, October 07, 2008 4:56 AM, Prakash, Sathya wrote: > > > Eric, > > > I think this patch will create more trouble, can you please > > > send your thoughts on this at your free time. I strongly > > > believe that removing hard reset totally is a bad Idea. > > > > > > Thanks > > > Sathya > > > > > > -----Original Message----- > > > From: Bernd Schubert [mailto:bs@xxxxxxxxx] > > > Sent: Monday, October 06, 2008 3:02 PM > > > To: Prakash, Sathya > > > Cc: Linux SCSI Mailing List; Moore, Eric; James Bottomley; > > > DL-MPT Fusion Linux > > > Subject: Re: [ PATCH 2/4 ] mpt fusion disable hard resets for > > > 53C1030 based devices > > > > > > Hello Sathya, > > > > > > On Monday 06 October 2008 11:07:00 Prakash, Sathya wrote: > > > > Hi Bernd, > > > > There are some cases where we MUST need hardreset for the > > > > > > firmware to > > > > > > > recover. So we can not completely avoid SoftReset, That > is the main > > > > purpose of our design of first to try softreset and if it > > > > > > is failing > > > > > > > then to go for hard reset. > > > > > > > > So I would suggest it is better not to remove the hard > > > > > > reset. If you > > > > > > > think the latest LSI provided driver has some cases of > > > > > > avoiding hard > > > > > > > reset like the one in this patch. Please let me know I will > > > > > > check and revert back. > > > > > > yes I can understand that, however, it only skips the hard > > > reset, when it knows it will cause even more trouble than > > > without it. Primary rule really MUST be "Do not kill innocent > > > unrelated devices!". > > > > > > What are the requirements for a hard reset? When BOTH IOCs > > > are in trouble, a single hard reset wouldn't make the > situation worse. > > > I didn't check yet and maybe you know immediately, is > > > ioc->alt_ioc a pointer to the real IOC structure? If so, we > > > could use it to check if this IOC also is in deep trouble. > > > > > > > > > Cheers, > > > Bernd > > > > > > > Thanks > > > > Sathya > > > > > > > > > > > > -----Original Message----- > > > > From: Bernd Schubert [mailto:bs@xxxxxxxxx] > > > > Sent: Tuesday, September 23, 2008 7:00 PM > > > > To: Linux SCSI Mailing List > > > > Cc: Moore, Eric; Prakash, Sathya; James Bottomley; DL-MPT > > > > > > Fusion Linux > > > > > > > Subject: Re: [ PATCH 2/4 ] mpt fusion disable hard resets > > > > > > for 53C1030 > > > > > > > based devices > > > > > > > > This is patch 2/4 ... > > > > > > > > On Tuesday 23 September 2008 15:26:30 Bernd Schubert wrote: > > > > > For 53C1030 based dual port HBAs the hard reset handler > > > > > > will cause > > > > > > > > trouble on the second channel with innocent devices. > It is then > > > > > better to fail the device which activated the error > > > > > > handler than to > > > > > > > > fail cause errors on unrelated devices. Of course, the real > > > > > solutions would be to figure out why the hard reset > handler cause > > > > > trouble on the second channel. Probably only LSI can > do, though. > > > > > > > > > > Signed-off-by: Bernd Schubert <bs@xxxxxxxxx> > > > > > > > > > > drivers/message/fusion/mptbase.c | 42 > > > > > > ++++++++++++++++++++++++++++- > > > > > > > > drivers/message/fusion/mptspi.c | 31 +++++++++++++++++++++ > > > > > 2 files changed, 72 insertions(+), 1 deletion(-) > > > > > > > > > > Index: linux-2.6.26/drivers/message/fusion/mptbase.c > > > > > > > =================================================================== > > > > > > > > --- linux-2.6.26.orig/drivers/message/fusion/mptbase.c > > > > > +++ linux-2.6.26/drivers/message/fusion/mptbase.c > > > > > @@ -59,6 +59,7 @@ > > > > > #include <linux/interrupt.h> /* needed for > > > > > > in_interrupt() proto > > > > > > > > */ #include <linux/dma-mapping.h> > > > > > #include <asm/io.h> > > > > > +#include <scsi/scsi_device.h> > > > > > #ifdef CONFIG_MTRR > > > > > #include <asm/mtrr.h> > > > > > #endif > > > > > @@ -6452,6 +6453,33 @@ > mpt_HardResetHandler(MPT_ADAPTER *ioc, i } > > > > > > > > > > /** > > > > > + * Check if there are devices connected to the > second (alt) ioc. > > > > > + * Return 1 if there is at least on device and 0 if > there are > > > > > + * none or no alt_ioc. > > > > > + */ > > > > > +static int > > > > > +alt_ioc_with_dev(MPT_ADAPTER *ioc) > > > > > +{ > > > > > + struct Scsi_Host *shost; > > > > > + struct scsi_device *sdev; > > > > > + int have_devices = 0; > > > > > + > > > > > + if (!ioc->alt_ioc) > > > > > + return 0; > > > > > + > > > > > + shost = ioc->alt_ioc->sh; > > > > > + > > > > > + shost_for_each_device(sdev, shost) { > > > > > + /* when we are here, we know there is > is a device > > > > > + * attached to this host, which is all we > > > > > > need to know */ > > > > > > > > + have_devices = 1; > > > > > + break; > > > > > + } > > > > > + > > > > > + return have_devices; > > > > > +} > > > > > + > > > > > +/** > > > > > * mpt_SoftHardResetHandler - Generic reset handler > > > > > * @ioc: Pointer to MPT_ADAPTER structure > > > > > * @sleepFlag: Indicates if sleep or schedule must > be called. > > > > > @@ -6466,7 +6494,19 @@ > mpt_SoftHardResetHandler(MPT_ADAPTER *io > > > > > > > > > > rc = mpt_SoftResetHandler(ioc, sleepFlag); > > > > > if (rc) { > > > > > - rc = mpt_HardResetHandler(ioc, sleepFlag); > > > > > + if (ioc->no_hard_reset && > alt_ioc_with_dev(ioc)) { > > > > > + /* On dual port HBAs based on the > > > > > > 53C1030 chip the > > > > > > > > + * hard reset handler will cause > > > > > > DID_SOFT_ERROR on > > > > > > > > + * the second (in principle > > > > > > independent) port. > > > > > > > > + * Almost always this error cannot > > > > > > be recovered > > > > > > > > + * causing entire device failures. > > > > > > So it better not > > > > > > > > + * to call the hard reset handler at > > > > > > all in order to > > > > > > > > + * prevent failures of > independent devices */ > > > > > + printk(MYIOC_s_INFO_FMT "Skipping > > > > > > hard reset in " > > > > > > > > + "order to prevent failures > > > > > > on %s.\n", > > > > > > > > + ioc->name, ioc->alt_ioc->name); > > > > > + } else > > > > > + rc = mpt_HardResetHandler(ioc, > sleepFlag); > > > > > } > > > > > > > > > > return rc; > > > > > Index: linux-2.6.26/drivers/message/fusion/mptspi.c > > > > > > > =================================================================== > > > > > > > > --- linux-2.6.26.orig/drivers/message/fusion/mptspi.c > > > > > +++ linux-2.6.26/drivers/message/fusion/mptspi.c > > > > > @@ -1301,6 +1301,33 @@ mptspi_resume(struct pci_dev > *pdev) #endif > > > > > > > > >/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= > > > > > > > > >-=-= > > > > >-= -=*/ +/** > > > > > + * avoid_hard_reset - check if hard resets should be avoided > > > > > + * @pdev: Pointer to pci_dev structure > > > > > + * > > > > > + * Hard resets will cause trouble on the the > secondary IOC of > > > > > + * 53C1030 based devices. > > > > > + * > > > > > + * Returns 1 if affected chip is found and 1 for > > > > > > unaffected chips > > > > > > > > + */ > > > > > +static int > > > > > +avoid_hard_reset(struct pci_dev *pdev) { > > > > > + int avoid; > > > > > + > > > > > + switch (pdev->device) { > > > > > + case MPI_MANUFACTPAGE_DEVID_53C1030: > > > > > + case MPI_MANUFACTPAGE_DEVID_53C1030ZC: > > > > > + /* TODO: which chips are affected as well? */ > > > > > + avoid = 1; > > > > > + break; > > > > > + default: > > > > > + avoid = 0; > > > > > + } > > > > > + > > > > > + return avoid; > > > > > +} > > > > > + > > > > > > > > >/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= > > > > > > > > >-=-= > > > > >-= -=*/ /* > > > > > * mptspi_probe - Installs scsi devices per bus. > > > > > @@ -1509,6 +1536,10 @@ mptspi_probe(struct pci_dev > *pdev, const > > > > > goto out_mptspi_probe; > > > > > } > > > > > > > > > > + /* hard resets on 53C1030 HBAs will cause trouble on > > > > > + secondaray > > > > > (alt) + * IOCs, so better no hard reset on these */ > > > > > + ioc->no_hard_reset = avoid_hard_reset(pdev); > > > > > + > > > > > /* > > > > > * issue internal bus reset > > > > > */ > > > > > -- > > > > > To unsubscribe from this list: send the line "unsubscribe > > > > > linux-scsi" in the body of a message to > majordomo@xxxxxxxxxxxxxxx > > > > > More majordomo info at > http://vger.kernel.org/majordomo-info.html > > > > > > > > -- > > > > Bernd Schubert > > > > Q-Leap Networks GmbH > > > > > > -- > > > Bernd Schubert > > > Q-Leap Networks GmbH > > > > -- > Bernd Schubert > Q-Leap Networks GmbH > -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
