From ac17ea8d7d45d0495316edff13faa0dfd6bb2225 Mon Sep 17 00:00:00 2001 From: john fastabend Date: Tue, 30 Nov 2010 16:18:39 -0800 Subject: [SCSI] libfc: incorrect scsi host byte codes returned to scsi-ml 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 Signed-off-by: Robert Love Signed-off-by: James Bottomley --- drivers/scsi/libfc/fc_fcp.c | 61 ++++++++++++++++++++++++++++++--------------- 1 file changed, 41 insertions(+), 20 deletions(-) (limited to 'drivers/scsi/libfc') diff --git a/drivers/scsi/libfc/fc_fcp.c b/drivers/scsi/libfc/fc_fcp.c index 0e985dbaedc4..8eb67676d0dd 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 */ @@ -1946,18 +1956,29 @@ 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"); -- cgit v1.2.3-59-g8ed1b