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author | Lalit Chandivade <lalit.chandivade@qlogic.com> | 2009-10-13 15:16:52 -0700 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-05-12 14:57:14 -0700 |
commit | b2729e2d217adfcc72e1e600b8e3ff4a6dd5cb4c (patch) | |
tree | e00550e2910161019d9114e537dab67020401046 | |
parent | 5d233bf3dcad483e5f89865aaf5973e67c1630b1 (diff) | |
download | lwn-b2729e2d217adfcc72e1e600b8e3ff4a6dd5cb4c.tar.gz lwn-b2729e2d217adfcc72e1e600b8e3ff4a6dd5cb4c.zip |
qla2xxx: Properly handle UNDERRUN completion statuses.
commit 0f00a206ccb1dc644b6770ef25f185610fee6962 upstream.
Correct issues where the lower scsi-status would be improperly
cleared, instead, allow the midlayer to process the status after
the proper residual-count checks are performed. Finally,
validate firmware status flags prior to assigning values from the
FCP_RSP frame.
Signed-off-by: Lalit Chandivade <lalit.chandivade@qlogic.com>
Signed-off-by: Michael Hernandez <michael.hernandez@qlogic.com>
Signed-off-by: Ravi Anand <ravi.anand@qlogic.com>
Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: Giridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r-- | drivers/scsi/qla2xxx/qla_isr.c | 120 |
1 files changed, 57 insertions, 63 deletions
diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c index b79481e1af0d..799bd75b5d45 100644 --- a/drivers/scsi/qla2xxx/qla_isr.c +++ b/drivers/scsi/qla2xxx/qla_isr.c @@ -1347,16 +1347,22 @@ qla2x00_status_entry(scsi_qla_host_t *vha, struct rsp_que *rsp, void *pkt) sense_len = rsp_info_len = resid_len = fw_resid_len = 0; if (IS_FWI2_CAPABLE(ha)) { - sense_len = le32_to_cpu(sts24->sense_len); - rsp_info_len = le32_to_cpu(sts24->rsp_data_len); - resid_len = le32_to_cpu(sts24->rsp_residual_count); - fw_resid_len = le32_to_cpu(sts24->residual_len); + if (scsi_status & SS_SENSE_LEN_VALID) + sense_len = le32_to_cpu(sts24->sense_len); + if (scsi_status & SS_RESPONSE_INFO_LEN_VALID) + rsp_info_len = le32_to_cpu(sts24->rsp_data_len); + if (scsi_status & (SS_RESIDUAL_UNDER | SS_RESIDUAL_OVER)) + resid_len = le32_to_cpu(sts24->rsp_residual_count); + if (comp_status == CS_DATA_UNDERRUN) + fw_resid_len = le32_to_cpu(sts24->residual_len); rsp_info = sts24->data; sense_data = sts24->data; host_to_fcp_swap(sts24->data, sizeof(sts24->data)); } else { - sense_len = le16_to_cpu(sts->req_sense_length); - rsp_info_len = le16_to_cpu(sts->rsp_info_len); + if (scsi_status & SS_SENSE_LEN_VALID) + sense_len = le16_to_cpu(sts->req_sense_length); + if (scsi_status & SS_RESPONSE_INFO_LEN_VALID) + rsp_info_len = le16_to_cpu(sts->rsp_info_len); resid_len = le32_to_cpu(sts->residual_length); rsp_info = sts->rsp_info; sense_data = sts->req_sense_data; @@ -1443,38 +1449,62 @@ qla2x00_status_entry(scsi_qla_host_t *vha, struct rsp_que *rsp, void *pkt) break; case CS_DATA_UNDERRUN: - resid = resid_len; + DEBUG2(printk(KERN_INFO + "scsi(%ld:%d:%d) UNDERRUN status detected 0x%x-0x%x. " + "resid=0x%x fw_resid=0x%x cdb=0x%x os_underflow=0x%x\n", + vha->host_no, cp->device->id, cp->device->lun, comp_status, + scsi_status, resid_len, fw_resid_len, cp->cmnd[0], + cp->underflow)); + /* Use F/W calculated residual length. */ - if (IS_FWI2_CAPABLE(ha)) { - if (!(scsi_status & SS_RESIDUAL_UNDER)) { - lscsi_status = 0; - } else if (resid != fw_resid_len) { - scsi_status &= ~SS_RESIDUAL_UNDER; - lscsi_status = 0; + resid = IS_FWI2_CAPABLE(ha) ? fw_resid_len : resid_len; + scsi_set_resid(cp, resid); + if (scsi_status & SS_RESIDUAL_UNDER) { + if (IS_FWI2_CAPABLE(ha) && fw_resid_len != resid_len) { + DEBUG2(printk( + "scsi(%ld:%d:%d:%d) Dropped frame(s) " + "detected (%x of %x bytes)...residual " + "length mismatch...retrying command.\n", + vha->host_no, cp->device->channel, + cp->device->id, cp->device->lun, resid, + scsi_bufflen(cp))); + + cp->result = DID_ERROR << 16 | lscsi_status; + break; } - resid = fw_resid_len; - } - if (scsi_status & SS_RESIDUAL_UNDER) { - scsi_set_resid(cp, resid); - } else { - DEBUG2(printk(KERN_INFO - "scsi(%ld:%d:%d) UNDERRUN status detected " - "0x%x-0x%x. resid=0x%x fw_resid=0x%x cdb=0x%x " - "os_underflow=0x%x\n", vha->host_no, - cp->device->id, cp->device->lun, comp_status, - scsi_status, resid_len, resid, cp->cmnd[0], - cp->underflow)); + if (!lscsi_status && + ((unsigned)(scsi_bufflen(cp) - resid) < + cp->underflow)) { + qla_printk(KERN_INFO, ha, + "scsi(%ld:%d:%d:%d): Mid-layer underflow " + "detected (%x of %x bytes)...returning " + "error status.\n", vha->host_no, + cp->device->channel, cp->device->id, + cp->device->lun, resid, scsi_bufflen(cp)); + cp->result = DID_ERROR << 16; + break; + } + } else if (!lscsi_status) { + DEBUG2(printk( + "scsi(%ld:%d:%d:%d) Dropped frame(s) detected " + "(%x of %x bytes)...firmware reported underrun..." + "retrying command.\n", vha->host_no, + cp->device->channel, cp->device->id, + cp->device->lun, resid, scsi_bufflen(cp))); + + cp->result = DID_ERROR << 16; + break; } + cp->result = DID_OK << 16 | lscsi_status; + /* * Check to see if SCSI Status is non zero. If so report SCSI * Status. */ if (lscsi_status != 0) { - cp->result = DID_OK << 16 | lscsi_status; - if (lscsi_status == SAM_STAT_TASK_SET_FULL) { DEBUG2(printk(KERN_INFO "scsi(%ld): QUEUE FULL status detected " @@ -1501,42 +1531,6 @@ qla2x00_status_entry(scsi_qla_host_t *vha, struct rsp_que *rsp, void *pkt) break; qla2x00_handle_sense(sp, sense_data, sense_len, rsp); - } else { - /* - * If RISC reports underrun and target does not report - * it then we must have a lost frame, so tell upper - * layer to retry it by reporting an error. - */ - if (!(scsi_status & SS_RESIDUAL_UNDER)) { - DEBUG2(printk("scsi(%ld:%d:%d:%d) Dropped " - "frame(s) detected (%x of %x bytes)..." - "retrying command.\n", - vha->host_no, cp->device->channel, - cp->device->id, cp->device->lun, resid, - scsi_bufflen(cp))); - - scsi_set_resid(cp, resid); - cp->result = DID_ERROR << 16; - break; - } - - /* Handle mid-layer underflow */ - if ((unsigned)(scsi_bufflen(cp) - resid) < - cp->underflow) { - qla_printk(KERN_INFO, ha, - "scsi(%ld:%d:%d:%d): Mid-layer underflow " - "detected (%x of %x bytes)...returning " - "error status.\n", vha->host_no, - cp->device->channel, cp->device->id, - cp->device->lun, resid, - scsi_bufflen(cp)); - - cp->result = DID_ERROR << 16; - break; - } - - /* Everybody online, looking good... */ - cp->result = DID_OK << 16; } break; |