From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932846AbcHCVhS (ORCPT ); Wed, 3 Aug 2016 17:37:18 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:10975 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758341AbcHCVhP (ORCPT ); Wed, 3 Aug 2016 17:37:15 -0400 X-IBM-Helo: d01dlp02.pok.ibm.com X-IBM-MailFrom: tyreld@linux.vnet.ibm.com From: Tyrel Datwyler To: james.bottomley@hansenpartnership.com Cc: martin.petersen@oracle.com, linux-scsi@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, brking@linux.vnet.ibm.com, nfont@linux.vnet.ibm.com, linux-kernel@vger.kernel.org, mpe@ellerman.id.au, Tyrel Datwyler Subject: [PATCH] ibmvfc: add FC Class 3 Error Recovery support Date: Wed, 3 Aug 2016 16:36:53 -0500 X-Mailer: git-send-email 2.7.4 In-Reply-To: <1470260213-19087-1-git-send-email-tyreld@linux.vnet.ibm.com> References: <1470260213-19087-1-git-send-email-tyreld@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16080321-0040-0000-0000-000000F8BDC0 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00005547; HX=3.00000240; KW=3.00000007; PH=3.00000004; SC=3.00000177; SDB=6.00739576; UDB=6.00347737; IPR=6.00512176; BA=6.00004642; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00012142; XFM=3.00000011; UTC=2016-08-03 21:37:06 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16080321-0041-0000-0000-000004D31B5F Message-Id: <1470260213-19087-3-git-send-email-tyreld@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-08-03_16:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=1 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1604210000 definitions=main-1608030214 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The ibmvfc driver currently doesn't support FC Class 3 Error Recovery. However, it is simply a matter of informing the VIOS that the payload expects to use sequence level error recovery via a bit flag in the ibmvfc_cmd structure. This patch adds a module parameter to enable error recovery support at boot time. When enabled the RETRY service parameter bit is set during PRLI, and ibmvfc_cmd->flags includes the IBMVFC_CLASS_3_ERR bit. Signed-off-by: Tyrel Datwyler --- drivers/scsi/ibmvscsi/ibmvfc.c | 10 ++++++++++ drivers/scsi/ibmvscsi/ibmvfc.h | 1 + 2 files changed, 11 insertions(+) diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c index 4a680ce..6b92169 100644 --- a/drivers/scsi/ibmvscsi/ibmvfc.c +++ b/drivers/scsi/ibmvscsi/ibmvfc.c @@ -52,6 +52,7 @@ static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT; static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS; static unsigned int ibmvfc_debug = IBMVFC_DEBUG; static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL; +static unsigned int cls3_error = IBMVFC_CLS3_ERROR; static LIST_HEAD(ibmvfc_head); static DEFINE_SPINLOCK(ibmvfc_driver_lock); static struct scsi_transport_template *ibmvfc_transport_template; @@ -86,6 +87,9 @@ MODULE_PARM_DESC(debug, "Enable driver debug information. " module_param_named(log_level, log_level, uint, 0); MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. " "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]"); +module_param_named(cls3_error, cls3_error, uint, 0); +MODULE_PARM_DESC(log_level, "Enable FC Class 3 Error Recovery. " + "[Default=" __stringify(IBMVFC_CLS3_ERROR) "]"); static const struct { u16 status; @@ -1335,6 +1339,9 @@ static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd, struct srp_direct_buf *data = &vfc_cmd->ioba; struct ibmvfc_host *vhost = dev_get_drvdata(dev); + if (cls3_error) + vfc_cmd->flags |= cpu_to_be16(IBMVFC_CLASS_3_ERR); + sg_mapped = scsi_dma_map(scmd); if (!sg_mapped) { vfc_cmd->flags |= cpu_to_be16(IBMVFC_NO_MEM_DESC); @@ -3383,6 +3390,9 @@ static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt) prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC); prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED); + if (cls3_error) + prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY); + ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT); if (ibmvfc_send_event(evt, vhost, default_timeout)) { vhost->discovery_threads--; diff --git a/drivers/scsi/ibmvscsi/ibmvfc.h b/drivers/scsi/ibmvscsi/ibmvfc.h index 8fae032..7f9bb07 100644 --- a/drivers/scsi/ibmvscsi/ibmvfc.h +++ b/drivers/scsi/ibmvscsi/ibmvfc.h @@ -54,6 +54,7 @@ #define IBMVFC_DEV_LOSS_TMO (5 * 60) #define IBMVFC_DEFAULT_LOG_LEVEL 2 #define IBMVFC_MAX_CDB_LEN 16 +#define IBMVFC_CLS3_ERROR 0 /* * Ensure we have resources for ERP and initialization: -- 2.7.4