From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161091AbcBDTzU (ORCPT ); Thu, 4 Feb 2016 14:55:20 -0500 Received: from e18.ny.us.ibm.com ([129.33.205.208]:43597 "EHLO e18.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934264AbcBDTzO (ORCPT ); Thu, 4 Feb 2016 14:55:14 -0500 X-IBM-Helo: d01dlp01.pok.ibm.com X-IBM-MailFrom: manoj@linux.vnet.ibm.com X-IBM-RcptTo: linux-kernel@vger.kernel.org;linux-scsi@vger.kernel.org Reply-To: manoj@linux.vnet.ibm.com Subject: Re: [PATCH 2/6] ibmvscsi: Add and use enums for valid CRQ header values References: <1454542114-1797-1-git-send-email-tyreld@linux.vnet.ibm.com> <1454542114-1797-3-git-send-email-tyreld@linux.vnet.ibm.com> To: Tyrel Datwyler , JBottomley@odin.com Cc: martin.petersen@oracle.com, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, nfont@linux.vnet.ibm.com, brking@linux.vnet.ibm.com, hare@suse.de From: Manoj Kumar Organization: IBM Message-ID: <56B3ACC9.60009@linux.vnet.ibm.com> Date: Thu, 4 Feb 2016 13:55:53 -0600 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.5.1 MIME-Version: 1.0 In-Reply-To: <1454542114-1797-3-git-send-email-tyreld@linux.vnet.ibm.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16020419-0045-0000-0000-0000033DBC64 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2/3/2016 5:28 PM, Tyrel Datwyler wrote: > The PAPR defines four valid header values for the first byte of a > CRQ message. Namely, an unused/empty message (0x00), a valid > command/response entry (0x80), a valid initialization entry (0xC0), > and a transport event (0xFF). Define these values as enums and use > them in the code in place of their magic number equivalents. > > Signed-off-by: Tyrel Datwyler > --- > drivers/scsi/ibmvscsi/ibmvscsi.c | 14 +++++++------- > drivers/scsi/ibmvscsi/viosrp.h | 7 +++++++ > 2 files changed, 14 insertions(+), 7 deletions(-) > > diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c > index adfef9d..176260d 100644 > --- a/drivers/scsi/ibmvscsi/ibmvscsi.c > +++ b/drivers/scsi/ibmvscsi/ibmvscsi.c > @@ -182,7 +182,7 @@ static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue) > > spin_lock_irqsave(&queue->lock, flags); > crq = &queue->msgs[queue->cur]; > - if (crq->valid & 0x80) { > + if (crq->valid & VIOSRP_CRQ_VALID) { After the switch to enums, bitwise operators are a bit misleading. Especially in this case since multiple values would satisfy this condition: VIOSRP_CRQ_VALID, VIOSRP_CRQ_INIT and VIOSRP_CRQ_TRANSPORT. If 'valid' will only have one of these four enums defined, would this be better written as: if (crq->valid != VIOSRP_CRQ_FREE) > if (++queue->cur == queue->size) > queue->cur = 0; > > @@ -231,7 +231,7 @@ static void ibmvscsi_task(void *data) > /* Pull all the valid messages off the CRQ */ > while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) { > ibmvscsi_handle_crq(crq, hostdata); > - crq->valid = 0x00; > + crq->valid = VIOSRP_CRQ_FREE; > } > > vio_enable_interrupts(vdev); > @@ -239,7 +239,7 @@ static void ibmvscsi_task(void *data) > if (crq != NULL) { > vio_disable_interrupts(vdev); > ibmvscsi_handle_crq(crq, hostdata); > - crq->valid = 0x00; > + crq->valid = VIOSRP_CRQ_FREE; > } else { > done = 1; > } > @@ -474,7 +474,7 @@ static int initialize_event_pool(struct event_pool *pool, > struct srp_event_struct *evt = &pool->events[i]; > memset(&evt->crq, 0x00, sizeof(evt->crq)); > atomic_set(&evt->free, 1); > - evt->crq.valid = 0x80; > + evt->crq.valid = VIOSRP_CRQ_VALID; > evt->crq.IU_length = cpu_to_be16(sizeof(*evt->xfer_iu)); > evt->crq.IU_data_ptr = cpu_to_be64(pool->iu_token + > sizeof(*evt->xfer_iu) * i); > @@ -1767,7 +1767,7 @@ static void ibmvscsi_handle_crq(struct viosrp_crq *crq, > struct srp_event_struct *evt_struct = > (__force struct srp_event_struct *)crq->IU_data_ptr; > switch (crq->valid) { > - case 0xC0: /* initialization */ > + case VIOSRP_CRQ_INIT: /* initialization */ > switch (crq->format) { > case 0x01: /* Initialization message */ > dev_info(hostdata->dev, "partner initialized\n"); > @@ -1791,7 +1791,7 @@ static void ibmvscsi_handle_crq(struct viosrp_crq *crq, > dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format); > } > return; > - case 0xFF: /* Hypervisor telling us the connection is closed */ > + case VIOSRP_CRQ_TRANSPORT: /* Hypervisor telling us the connection is closed */ > scsi_block_requests(hostdata->host); > atomic_set(&hostdata->request_limit, 0); > if (crq->format == 0x06) { > @@ -1807,7 +1807,7 @@ static void ibmvscsi_handle_crq(struct viosrp_crq *crq, > ibmvscsi_reset_host(hostdata); > } > return; > - case 0x80: /* real payload */ > + case VIOSRP_CRQ_VALID: /* real payload */ > break; > default: > dev_err(hostdata->dev, "got an invalid message type 0x%02x\n", > diff --git a/drivers/scsi/ibmvscsi/viosrp.h b/drivers/scsi/ibmvscsi/viosrp.h > index d1044e9..17f2de0 100644 > --- a/drivers/scsi/ibmvscsi/viosrp.h > +++ b/drivers/scsi/ibmvscsi/viosrp.h > @@ -51,6 +51,13 @@ union srp_iu { > u8 reserved[SRP_MAX_IU_LEN]; > }; > > +enum viosrp_crq_headers { > + VIOSRP_CRQ_FREE = 0x00, > + VIOSRP_CRQ_VALID = 0x80, > + VIOSRP_CRQ_INIT = 0xC0, > + VIOSRP_CRQ_TRANSPORT = 0xFF > +}; > + > enum viosrp_crq_formats { > VIOSRP_SRP_FORMAT = 0x01, > VIOSRP_MAD_FORMAT = 0x02, >