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IB/ipath: HW workaround for case where chip can send but not receive 

Workaround a QLE7140 problem that in rare cases causes flow control
problems after link recovery by forcing a link retrain after recovery.
A module parameter is provided to control the behavior in case it causes
problems.

Signed-off-by: Dave Olson <dave.olson@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Dave Olson 2008-04-16 21:09:25 -07:00 committed by Roland Dreier
parent a51a2513a8
commit 72708a0a2b
3 changed files with 24 additions and 0 deletions
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4
drivers/infiniband/hw/ipath/ipath_driver.c
View File

@ -82,6 +82,10 @@ module_param_named(hol_timeout_ms, ipath_hol_timeout_ms, uint, S_IRUGO);
MODULE_PARM_DESC(hol_timeout_ms,
"duration of user app suspension after link failure");
unsigned ipath_linkrecovery = 1;
module_param_named(linkrecovery, ipath_linkrecovery, uint, S_IWUSR | S_IRUGO);
MODULE_PARM_DESC(linkrecovery, "enable workaround for link recovery issue");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("QLogic <support@pathscale.com>");
MODULE_DESCRIPTION("QLogic InfiniPath driver");

18
drivers/infiniband/hw/ipath/ipath_intr.c
View File

@ -366,6 +366,22 @@ static void handle_e_ibstatuschanged(struct ipath_devdata *dd,
dd->ipath_ibpollcnt = 0; /* not poll*, now */
ipath_stats.sps_iblink++;
if (ibstate != init && dd->ipath_lastlinkrecov && ipath_linkrecovery) {
u64 linkrecov;
linkrecov = ipath_snap_cntr(dd,
dd->ipath_cregs->cr_iblinkerrrecovcnt);
if (linkrecov != dd->ipath_lastlinkrecov) {
ipath_dbg("IB linkrecov up %Lx (%s %s) recov %Lu\n",
ibcs, ib_linkstate(dd, ibcs),
ipath_ibcstatus_str[ltstate],
linkrecov);
/* and no more until active again */
dd->ipath_lastlinkrecov = 0;
ipath_set_linkstate(dd, IPATH_IB_LINKDOWN);
goto skip_ibchange;
}
}
if (ibstate == init || ibstate == arm || ibstate == active) {
*dd->ipath_statusp &= ~IPATH_STATUS_IB_NOCABLE;
if (ibstate == init || ibstate == arm) {
@ -392,6 +408,8 @@ static void handle_e_ibstatuschanged(struct ipath_devdata *dd,
IPATH_NOCABLE);
ipath_hol_down(dd);
} else { /* active */
dd->ipath_lastlinkrecov = ipath_snap_cntr(dd,
dd->ipath_cregs->cr_iblinkerrrecovcnt);
*dd->ipath_statusp |=
IPATH_STATUS_IB_READY | IPATH_STATUS_IB_CONF;
dd->ipath_flags |= IPATH_LINKACTIVE;

2
drivers/infiniband/hw/ipath/ipath_kernel.h
View File

@ -309,6 +309,7 @@ struct ipath_devdata {
ipath_err_t ipath_lasthwerror;
/* errors masked because they occur too fast */
ipath_err_t ipath_maskederrs;
u64 ipath_lastlinkrecov; /* link recoveries at last ACTIVE */
/* time in jiffies at which to re-enable maskederrs */
unsigned long ipath_unmasktime;
/* count of egrfull errors, combined for all ports */
@ -1099,6 +1100,7 @@ dma_addr_t ipath_map_single(struct pci_dev *, void *, size_t, int);
#endif
extern unsigned ipath_debug; /* debugging bit mask */
extern unsigned ipath_linkrecovery;
extern unsigned ipath_mtu4096;
#define IPATH_MAX_PARITY_ATTEMPTS 10000 /* max times to try recovery */