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authorJoe Eykholt <jeykholt@cisco.com>2010-06-11 16:44:51 -0700
committerJames Bottomley <James.Bottomley@suse.de>2010-07-27 12:01:52 -0500
commit4b2164d4d212e437c9f080023a67f8f9356d2c4c (patch)
treeaaa86c0e2b1532b87780f568b35921e56342557d /include/scsi
parent0db6f4353d68c0108b5fe0bad8259de0197589c6 (diff)
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[SCSI] libfc: Fix remote port restart problem
This patch somewhat combines two fixes to remote port handing in libfc. The first problem was that rport work could be queued on a deleted and freed rport. This is handled by not resetting rdata->event ton NONE if the rdata is about to be deleted. However, that fix led to the second problem, described by Bhanu Gollapudi, as follows: > Here is the sequence of events. T1 is first LOGO receive thread, T2 is > fc_rport_work() scheduled by T1 and T3 is second LOGO receive thread and > T4 is fc_rport_work scheduled by T3. > > 1. (T1)Received 1st LOGO in state Ready > 2. (T1)Delete port & enter to RESTART state. > 3. (T1)schdule event_work, since event is RPORT_EV_NONE. > 4. (T1)set event = RPORT_EV_LOGO > 5. (T1)Enter RESTART state as disc_id is set. > 6. (T2)remember to PLOGI, and set event = RPORT_EV_NONE > 6. (T3)Received 2nd LOGO > 7. (T3)Delete Port & enter to RESTART state. > 8. (T3)schedule event_work, since event is RPORT_EV_NONE. > 9. (T3)Enter RESTART state as disc_id is set. > 9. (T3)set event = RPORT_EV_LOGO > 10.(T2)work restart, enter PLOGI state and issues PLOGI > 11.(T4)Since state is not RESTART anymore, restart is not set, and the > event is not reset to RPORT_EV_NONE. (current event is RPORT_EV_LOGO). > 12. Now, PLOGI succeeds and fc_rport_enter_ready() will not schedule > event_work, and hence the rport will never be created, eventually losing > the target after dev_loss_tmo. So, the problem here is that we were tracking the desire for the rport be restarted by state RESTART, which was otherwise equivalent to DELETE. A contributing factor is that we dropped the lock between steps 6 and 10 in thread T2, which allows the state to change, and we didn't completely re-evaluate then. This is hopefully corrected by the following minor redesign: Simplify the rport restart logic by making the decision to restart after deleting the transport rport. That decision is based on a new STARTED flag that indicates fc_rport_login() has been called and fc_rport_logoff() has not been called since then. This replaces the need for the RESTART state. Only restart if the rdata is still in DELETED state and only if it still has the STARTED flag set. Also now, since we clear the event code much later in the work thread, allow for the possibility that the rport may have become READY again via incoming PLOGI, and if so, queue another event to handle that. In the problem scenario, the second LOGO received will cause the LOGO event to occur again. Reported-by: Bhanu Gollapudi <bprakash@broadcom.com> Signed-off-by: Joe Eykholt <jeykholt@cisco.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'include/scsi')
-rw-r--r--include/scsi/libfc.h5
1 files changed, 2 insertions, 3 deletions
diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h
index 7495c0ba67e..db54c4a2d14 100644
--- a/include/scsi/libfc.h
+++ b/include/scsi/libfc.h
@@ -104,7 +104,6 @@ enum fc_disc_event {
* @RPORT_ST_LOGO: Remote port logout (LOGO) sent
* @RPORT_ST_ADISC: Discover Address sent
* @RPORT_ST_DELETE: Remote port being deleted
- * @RPORT_ST_RESTART: Remote port being deleted and will restart
*/
enum fc_rport_state {
RPORT_ST_INIT,
@@ -115,7 +114,6 @@ enum fc_rport_state {
RPORT_ST_LOGO,
RPORT_ST_ADISC,
RPORT_ST_DELETE,
- RPORT_ST_RESTART,
};
/**
@@ -173,6 +171,7 @@ struct fc_rport_libfc_priv {
u16 flags;
#define FC_RP_FLAGS_REC_SUPPORTED (1 << 0)
#define FC_RP_FLAGS_RETRY (1 << 1)
+ #define FC_RP_STARTED (1 << 2)
unsigned int e_d_tov;
unsigned int r_a_tov;
};
@@ -185,7 +184,7 @@ struct fc_rport_libfc_priv {
* @rp_state: Enumeration that tracks progress of PLOGI, PRLI,
* and RTV exchanges
* @ids: The remote port identifiers and roles
- * @flags: REC and RETRY supported flags
+ * @flags: STARTED, REC and RETRY_SUPPORTED flags
* @max_seq: Maximum number of concurrent sequences
* @disc_id: The discovery identifier
* @maxframe_size: The maximum frame size