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Mon, 11 Jan 2021 23:12:31 +0000 (GMT) Received: from vios4361.aus.stglabs.ibm.com (unknown [9.3.43.61]) by b03ledav004.gho.boulder.ibm.com (Postfix) with ESMTP; Mon, 11 Jan 2021 23:12:31 +0000 (GMT) From: Tyrel Datwyler To: james.bottomley@hansenpartnership.com Subject: [PATCH v4 09/21] ibmvfc: add handlers to drain and complete Sub-CRQ responses Date: Mon, 11 Jan 2021 17:12:13 -0600 Message-Id: <20210111231225.105347-10-tyreld@linux.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210111231225.105347-1-tyreld@linux.ibm.com> References: <20210111231225.105347-1-tyreld@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.343, 18.0.737 definitions=2021-01-11_32:2021-01-11, 2021-01-11 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 suspectscore=0 impostorscore=0 lowpriorityscore=0 malwarescore=0 bulkscore=0 mlxscore=0 priorityscore=1501 mlxlogscore=999 spamscore=0 adultscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2101110126 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Tyrel Datwyler , martin.petersen@oracle.com, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, brking@linux.ibm.com, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" The logic for iterating over the Sub-CRQ responses is similiar to that of the primary CRQ. Add the necessary handlers for processing those responses. Signed-off-by: Tyrel Datwyler --- drivers/scsi/ibmvscsi/ibmvfc.c | 86 ++++++++++++++++++++++++++++++++++ 1 file changed, 86 insertions(+) diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c index 5d7ada0ed0d6..f3cd092478ee 100644 --- a/drivers/scsi/ibmvscsi/ibmvfc.c +++ b/drivers/scsi/ibmvscsi/ibmvfc.c @@ -3485,6 +3485,92 @@ static int ibmvfc_toggle_scrq_irq(struct ibmvfc_queue *scrq, int enable) return rc; } +static void ibmvfc_handle_scrq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost, + struct list_head *evt_doneq) +{ + struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba); + + switch (crq->valid) { + case IBMVFC_CRQ_CMD_RSP: + break; + case IBMVFC_CRQ_XPORT_EVENT: + return; + default: + dev_err(vhost->dev, "Got and invalid message type 0x%02x\n", crq->valid); + return; + } + + /* The only kind of payload CRQs we should get are responses to + * things we send. Make sure this response is to something we + * actually sent + */ + if (unlikely(!ibmvfc_valid_event(&evt->queue->evt_pool, evt))) { + dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n", + crq->ioba); + return; + } + + if (unlikely(atomic_read(&evt->free))) { + dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n", + crq->ioba); + return; + } + + spin_lock(&evt->queue->l_lock); + list_move_tail(&evt->queue_list, evt_doneq); + spin_unlock(&evt->queue->l_lock); +} + +static struct ibmvfc_crq *ibmvfc_next_scrq(struct ibmvfc_queue *scrq) +{ + struct ibmvfc_crq *crq; + + crq = &scrq->msgs.scrq[scrq->cur].crq; + if (crq->valid & 0x80) { + if (++scrq->cur == scrq->size) + scrq->cur = 0; + rmb(); + } else + crq = NULL; + + return crq; +} + +static void ibmvfc_drain_sub_crq(struct ibmvfc_queue *scrq) +{ + struct ibmvfc_crq *crq; + struct ibmvfc_event *evt, *temp; + unsigned long flags; + int done = 0; + LIST_HEAD(evt_doneq); + + spin_lock_irqsave(scrq->q_lock, flags); + while (!done) { + while ((crq = ibmvfc_next_scrq(scrq)) != NULL) { + ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq); + crq->valid = 0; + wmb(); + } + + ibmvfc_toggle_scrq_irq(scrq, 1); + if ((crq = ibmvfc_next_scrq(scrq)) != NULL) { + ibmvfc_toggle_scrq_irq(scrq, 0); + ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq); + crq->valid = 0; + wmb(); + } else + done = 1; + } + spin_unlock_irqrestore(scrq->q_lock, flags); + + list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) { + del_timer(&evt->timer); + list_del(&evt->queue_list); + ibmvfc_trc_end(evt); + evt->done(evt); + } +} + /** * ibmvfc_init_tgt - Set the next init job step for the target * @tgt: ibmvfc target struct -- 2.27.0