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nvme-fc: on lldd/transport io error, terminate association 

Per FC-NVME, when lldd or transport detects an i/o error, the
connection must be terminated, which in turn requires the association
to be termianted.  Currently the transport simply creates a nvme
completion status of transport error and returns the io. The FC-NVME
spec makes the mandate as initiator and host, depending on the error,
can get out of sync on outstanding io counts (sqhd/sqtail).

Implement the association teardown on lldd or transport detected
errors.

Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
This commit is contained in:
James Smart 2017-06-01 22:54:21 -07:00 committed by Christoph Hellwig
parent e818a5b487
commit f874d5d079
1 changed files with 17 additions and 2 deletions
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19
drivers/nvme/host/fc.c
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@ -1139,6 +1139,7 @@ nvme_fc_xmt_disconnect_assoc(struct nvme_fc_ctrl *ctrl)
/* *********************** NVME Ctrl Routines **************************** */
static void __nvme_fc_final_op_cleanup(struct request *rq);
static void nvme_fc_error_recovery(struct nvme_fc_ctrl *ctrl, char *errmsg);
static int
nvme_fc_reinit_request(void *data, struct request *rq)
@ -1265,7 +1266,7 @@ nvme_fc_fcpio_done(struct nvmefc_fcp_req *req)
struct nvme_command *sqe = &op->cmd_iu.sqe;
__le16 status = cpu_to_le16(NVME_SC_SUCCESS << 1);
union nvme_result result;
bool complete_rq;
bool complete_rq, terminate_assoc = true;
/*
* WARNING:
@ -1294,6 +1295,14 @@ nvme_fc_fcpio_done(struct nvmefc_fcp_req *req)
* fabricate a CQE, the following fields will not be set as they
* are not referenced:
* cqe.sqid, cqe.sqhd, cqe.command_id
*
* Failure or error of an individual i/o, in a transport
* detected fashion unrelated to the nvme completion status,
* potentially cause the initiator and target sides to get out
* of sync on SQ head/tail (aka outstanding io count allowed).
* Per FC-NVME spec, failure of an individual command requires
* the connection to be terminated, which in turn requires the
* association to be terminated.
*/
fc_dma_sync_single_for_cpu(ctrl->lport->dev, op->fcp_req.rspdma,
@ -1359,6 +1368,8 @@ nvme_fc_fcpio_done(struct nvmefc_fcp_req *req)
goto done;
}
terminate_assoc = false;
done:
if (op->flags & FCOP_FLAGS_AEN) {
nvme_complete_async_event(&queue->ctrl->ctrl, status, &result);
@ -1366,7 +1377,7 @@ nvme_fc_fcpio_done(struct nvmefc_fcp_req *req)
atomic_set(&op->state, FCPOP_STATE_IDLE);
op->flags = FCOP_FLAGS_AEN; /* clear other flags */
nvme_fc_ctrl_put(ctrl);
return;
goto check_error;
}
complete_rq = __nvme_fc_fcpop_chk_teardowns(ctrl, op);
@ -1379,6 +1390,10 @@ nvme_fc_fcpio_done(struct nvmefc_fcp_req *req)
nvme_end_request(rq, status, result);
} else
__nvme_fc_final_op_cleanup(rq);
check_error:
if (terminate_assoc)
nvme_fc_error_recovery(ctrl, "transport detected io error");
}
static int