From: john fastabend <john.r.fastabend@xxxxxxxxx>
The fcp packet recovery handler fc_fcp_recover() is called
when errors occurr in a fcp session. Currently it is
generically setting the status code to FC_CMD_RECOVERY for
all error types. This results in DID_BUS_BUSY errors
being returned to the scsi-ml.
DID_BUS_BUSY errors indicate "BUS stayed busy through time
out period" according to scsi.h. Many of the error reported
by fc_rcp_recovery() are pkt errors. Here we update
fc_fcp_recovery to use better host byte codes.
With certain FAST FAIL flags set DID_BUS_BUSY and DID_ERROR
will have different behaviors this was causing dm multipath
to fail quickly in some cases where a retry would be a
better action.
Signed-off-by: John Fastabend <john.r.fastabend@xxxxxxxxx>
Signed-off-by: Robert Love <robert.w.love@xxxxxxxxx>
---
drivers/scsi/libfc/fc_fcp.c | 61 +++++++++++++++++++++++++++++--------------
1 files changed, 41 insertions(+), 20 deletions(-)
diff --git a/drivers/scsi/libfc/fc_fcp.c b/drivers/scsi/libfc/fc_fcp.c
index eb3fe37..87361cc 100644
--- a/drivers/scsi/libfc/fc_fcp.c
+++ b/drivers/scsi/libfc/fc_fcp.c
@@ -96,7 +96,7 @@ static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *);
static void fc_fcp_complete_locked(struct fc_fcp_pkt *);
static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *);
static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *);
-static void fc_fcp_recovery(struct fc_fcp_pkt *);
+static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code);
static void fc_fcp_timeout(unsigned long);
static void fc_fcp_rec(struct fc_fcp_pkt *);
static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *);
@@ -120,7 +120,8 @@ static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *);
#define FC_DATA_UNDRUN 7
#define FC_ERROR 8
#define FC_HRD_ERROR 9
-#define FC_CMD_RECOVERY 10
+#define FC_CRC_ERROR 10
+#define FC_TIMED_OUT 11
/*
* Error recovery timeout values.
@@ -438,6 +439,7 @@ static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
void *buf;
struct scatterlist *sg;
u32 nents;
+ u8 host_bcode = FC_COMPLETE;
fh = fc_frame_header_get(fp);
offset = ntohl(fh->fh_parm_offset);
@@ -446,13 +448,16 @@ static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
buf = fc_frame_payload_get(fp, 0);
/*
- * if this I/O is ddped then clear it
- * and initiate recovery since data
- * frames are expected to be placed
- * directly in that case.
+ * if this I/O is ddped then clear it and initiate recovery since data
+ * frames are expected to be placed directly in that case.
+ *
+ * Indicate error to scsi-ml because something went wrong with the
+ * ddp handling to get us here.
*/
if (fsp->xfer_ddp != FC_XID_UNKNOWN) {
fc_fcp_ddp_done(fsp);
+ FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n");
+ host_bcode = FC_ERROR;
goto err;
}
if (offset + len > fsp->data_len) {
@@ -462,6 +467,9 @@ static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
goto crc_err;
FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx "
"data_len %x\n", len, offset, fsp->data_len);
+
+ /* Data is corrupted indicate scsi-ml should retry */
+ host_bcode = FC_DATA_OVRRUN;
goto err;
}
if (offset != fsp->xfer_len)
@@ -498,8 +506,10 @@ crc_err:
* If so, we need to retry the entire operation.
* Otherwise, ignore it.
*/
- if (fsp->state & FC_SRB_DISCONTIG)
+ if (fsp->state & FC_SRB_DISCONTIG) {
+ host_bcode = FC_CRC_ERROR;
goto err;
+ }
return;
}
}
@@ -517,7 +527,7 @@ crc_err:
fc_fcp_complete_locked(fsp);
return;
err:
- fc_fcp_recovery(fsp);
+ fc_fcp_recovery(fsp, host_bcode);
}
/**
@@ -1347,7 +1357,7 @@ static void fc_fcp_timeout(unsigned long data)
else if (fsp->state & FC_SRB_RCV_STATUS)
fc_fcp_complete_locked(fsp);
else
- fc_fcp_recovery(fsp);
+ fc_fcp_recovery(fsp, FC_TIMED_OUT);
fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO;
unlock:
fc_fcp_unlock_pkt(fsp);
@@ -1391,7 +1401,7 @@ retry:
if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
else
- fc_fcp_recovery(fsp);
+ fc_fcp_recovery(fsp, FC_TIMED_OUT);
}
/**
@@ -1460,7 +1470,7 @@ static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
fc_fcp_retry_cmd(fsp);
break;
}
- fc_fcp_recovery(fsp);
+ fc_fcp_recovery(fsp, FC_ERROR);
break;
}
} else if (opcode == ELS_LS_ACC) {
@@ -1575,7 +1585,7 @@ static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
fc_fcp_rec(fsp);
else
- fc_fcp_recovery(fsp);
+ fc_fcp_recovery(fsp, FC_ERROR);
break;
}
fc_fcp_unlock_pkt(fsp);
@@ -1587,9 +1597,9 @@ out:
* fc_fcp_recovery() - Handler for fcp_pkt recovery
* @fsp: The FCP pkt that needs to be aborted
*/
-static void fc_fcp_recovery(struct fc_fcp_pkt *fsp)
+static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code)
{
- fsp->status_code = FC_CMD_RECOVERY;
+ fsp->status_code = code;
fsp->cdb_status = 0;
fsp->io_status = 0;
/*
@@ -1695,7 +1705,7 @@ static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
break;
case ELS_LS_RJT:
default:
- fc_fcp_recovery(fsp);
+ fc_fcp_recovery(fsp, FC_ERROR);
break;
}
fc_fcp_unlock_pkt(fsp);
@@ -1721,7 +1731,7 @@ static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
fc_fcp_rec(fsp);
else
- fc_fcp_recovery(fsp);
+ fc_fcp_recovery(fsp, FC_TIMED_OUT);
break;
case -FC_EX_CLOSED: /* e.g., link failure */
/* fall through */
@@ -1944,18 +1954,29 @@ static void fc_io_compl(struct fc_fcp_pkt *fsp)
break;
case FC_CMD_ABORTED:
FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
- "due to FC_CMD_ABORTED\n");
+ "due to FC_CMD_ABORTED\n");
sc_cmd->result = (DID_ERROR << 16) | fsp->io_status;
break;
- case FC_CMD_RECOVERY:
- sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
- break;
case FC_CMD_RESET:
+ FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml "
+ "due to FC_CMD_RESET\n");
sc_cmd->result = (DID_RESET << 16);
break;
case FC_HRD_ERROR:
+ FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml "
+ "due to FC_HRD_ERROR\n");
sc_cmd->result = (DID_NO_CONNECT << 16);
break;
+ case FC_CRC_ERROR:
+ FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml "
+ "due to FC_CRC_ERROR\n");
+ sc_cmd->result = (DID_PARITY << 16);
+ break;
+ case FC_TIMED_OUT:
+ FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml "
+ "due to FC_TIMED_OUT\n");
+ sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
+ break;
default:
FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
"due to unknown error\n");
--
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