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Mon, 05 Oct 2020 10:18:10 -0700 (PDT) Subject: Re: [PATCH 2/7] nvmet-fc: use per-target workqueue when removing associations To: Hannes Reinecke , Christoph Hellwig References: <20200922121501.32851-1-hare@suse.de> <20200922121501.32851-3-hare@suse.de> From: James Smart Message-ID: <41ce327c-6b29-8835-9541-6ff41a0fb9c8@broadcom.com> Date: Mon, 5 Oct 2020 10:18:09 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.2.2 MIME-Version: 1.0 In-Reply-To: <20200922121501.32851-3-hare@suse.de> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201005_131815_035594_8CBFE477 X-CRM114-Status: GOOD ( 24.81 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-nvme@lists.infradead.org, Sagi Grimberg , Keith Busch Content-Type: multipart/mixed; boundary="===============5753203026459765316==" Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org --===============5753203026459765316== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000caf17c05b0efaa26" --000000000000caf17c05b0efaa26 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US On 9/22/2020 5:14 AM, Hannes Reinecke wrote: > When removing target ports all outstanding associations need to be > terminated / cleaned up. As this involves several exchanges on the > wire a synchronization point is required to establish when these > exchanges have ran their course and it's safe to delete the association. > So add a per-target workqueue and flush this workqueue to ensure > the association can really be deleted. > > Signed-off-by: Hannes Reinecke > --- > drivers/nvme/target/fc.c | 29 +++++++++++++++++++++++------ > 1 file changed, 23 insertions(+), 6 deletions(-) > > diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c > index 04ec0076ae59..63f5deb3b68a 100644 > --- a/drivers/nvme/target/fc.c > +++ b/drivers/nvme/target/fc.c > @@ -99,6 +99,7 @@ struct nvmet_fc_tgtport { > struct list_head tgt_list; /* nvmet_fc_target_list */ > struct device *dev; /* dev for dma mapping */ > struct nvmet_fc_target_template *ops; > + struct workqueue_struct *work_q; > > struct nvmet_fc_ls_iod *iod; > spinlock_t lock; > @@ -1403,10 +1404,17 @@ nvmet_fc_register_targetport(struct nvmet_fc_port_info *pinfo, > ida_init(&newrec->assoc_cnt); > newrec->max_sg_cnt = template->max_sgl_segments; > > + newrec->work_q = alloc_workqueue("ntfc%d", 0, 0, > + newrec->fc_target_port.port_num); > + if (!newrec->work_q) { > + ret = -ENOMEM; > + goto out_free_newrec; > + } > + > ret = nvmet_fc_alloc_ls_iodlist(newrec); > if (ret) { > ret = -ENOMEM; > - goto out_free_newrec; > + goto out_free_workq; > } > > nvmet_fc_portentry_rebind_tgt(newrec); > @@ -1418,6 +1426,8 @@ nvmet_fc_register_targetport(struct nvmet_fc_port_info *pinfo, > *portptr = &newrec->fc_target_port; > return 0; > > +out_free_workq: > + destroy_workqueue(newrec->work_q); > out_free_newrec: > put_device(dev); > out_ida_put: > @@ -1443,6 +1453,8 @@ nvmet_fc_free_tgtport(struct kref *ref) > list_del(&tgtport->tgt_list); > spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); > > + destroy_workqueue(tgtport->work_q); > + > nvmet_fc_free_ls_iodlist(tgtport); > > /* let the LLDD know we've finished tearing it down */ > @@ -1481,11 +1493,13 @@ __nvmet_fc_free_assocs(struct nvmet_fc_tgtport *tgtport) > &tgtport->assoc_list, a_list) { > if (!nvmet_fc_tgt_a_get(assoc)) > continue; > - if (!schedule_work(&assoc->del_work)) > + if (!queue_work(tgtport->work_q, &assoc->del_work)) > /* already deleting - release local reference */ > nvmet_fc_tgt_a_put(assoc); > } > spin_unlock_irqrestore(&tgtport->lock, flags); > + > + flush_workqueue(tgtport->work_q); > } > > /** > @@ -1536,12 +1550,14 @@ nvmet_fc_invalidate_host(struct nvmet_fc_target_port *target_port, > continue; > assoc->hostport->invalid = 1; > noassoc = false; > - if (!schedule_work(&assoc->del_work)) > + if (!queue_work(tgtport->work_q, &assoc->del_work)) > /* already deleting - release local reference */ > nvmet_fc_tgt_a_put(assoc); > } > spin_unlock_irqrestore(&tgtport->lock, flags); > > + flush_workqueue(tgtport->work_q); > + > /* if there's nothing to wait for - call the callback */ > if (noassoc && tgtport->ops->host_release) > tgtport->ops->host_release(hosthandle); > @@ -1579,14 +1595,15 @@ nvmet_fc_delete_ctrl(struct nvmet_ctrl *ctrl) > } > spin_unlock_irqrestore(&tgtport->lock, flags); > > - nvmet_fc_tgtport_put(tgtport); > - > if (found_ctrl) { > - if (!schedule_work(&assoc->del_work)) > + if (!queue_work(tgtport->work_q, &assoc->del_work)) > /* already deleting - release local reference */ > nvmet_fc_tgt_a_put(assoc); > + flush_workqueue(tgtport->work_q); > + nvmet_fc_tgtport_put(tgtport); > return; > } > + nvmet_fc_tgtport_put(tgtport); > > spin_lock_irqsave(&nvmet_fc_tgtlock, flags); > } Looks reasonable. 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