linux-kernel - [PATCH 08/13] IB/iser: set virt_boundary

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Message-Id: <20190605190836.32354-9-hch@lst.de>
Date:   Wed,  5 Jun 2019 21:08:31 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Sebastian Ott <sebott@...ux.ibm.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Max Gurtovoy <maxg@...lanox.com>,
        Bart Van Assche <bvanassche@....org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Oliver Neukum <oneukum@...e.com>, linux-block@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-scsi@...r.kernel.org,
        megaraidlinux.pdl@...adcom.com, MPT-FusionLinux.pdl@...adcom.com,
        linux-hyperv@...r.kernel.org, linux-usb@...r.kernel.org,
        usb-storage@...ts.one-eyed-alien.net, linux-kernel@...r.kernel.org
Subject: [PATCH 08/13] IB/iser: set virt_boundary_mask in the scsi host

This ensures all proper DMA layer handling is taken care of by the
SCSI midlayer.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 drivers/infiniband/ulp/iser/iscsi_iser.c | 35 +++++-------------------
 1 file changed, 7 insertions(+), 28 deletions(-)

diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c
index 9c185a8dabd3..841b66397a57 100644
--- a/drivers/infiniband/ulp/iser/iscsi_iser.c
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -613,6 +613,7 @@ iscsi_iser_session_create(struct iscsi_endpoint *ep,
 	struct Scsi_Host *shost;
 	struct iser_conn *iser_conn = NULL;
 	struct ib_conn *ib_conn;
+	struct ib_device *ib_dev;
 	u32 max_fr_sectors;
 
 	shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0);
@@ -643,16 +644,19 @@ iscsi_iser_session_create(struct iscsi_endpoint *ep,
 		}
 
 		ib_conn = &iser_conn->ib_conn;
+		ib_dev = ib_conn->device->ib_device;
 		if (ib_conn->pi_support) {
-			u32 sig_caps = ib_conn->device->ib_device->attrs.sig_prot_cap;
+			u32 sig_caps = ib_dev->attrs.sig_prot_cap;
 
 			scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps));
 			scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP |
 						   SHOST_DIX_GUARD_CRC);
 		}
 
-		if (iscsi_host_add(shost,
-				   ib_conn->device->ib_device->dev.parent)) {
+		if (!(ib_dev->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG))
+			shost->virt_boundary_mask = ~MASK_4K;
+
+		if (iscsi_host_add(shost, ib_dev->dev.parent)) {
 			mutex_unlock(&iser_conn->state_mutex);
 			goto free_host;
 		}
@@ -958,30 +962,6 @@ static umode_t iser_attr_is_visible(int param_type, int param)
 	return 0;
 }
 
-static int iscsi_iser_slave_alloc(struct scsi_device *sdev)
-{
-	struct iscsi_session *session;
-	struct iser_conn *iser_conn;
-	struct ib_device *ib_dev;
-
-	mutex_lock(&unbind_iser_conn_mutex);
-
-	session = starget_to_session(scsi_target(sdev))->dd_data;
-	iser_conn = session->leadconn->dd_data;
-	if (!iser_conn) {
-		mutex_unlock(&unbind_iser_conn_mutex);
-		return -ENOTCONN;
-	}
-	ib_dev = iser_conn->ib_conn.device->ib_device;
-
-	if (!(ib_dev->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG))
-		blk_queue_virt_boundary(sdev->request_queue, ~MASK_4K);
-
-	mutex_unlock(&unbind_iser_conn_mutex);
-
-	return 0;
-}
-
 static struct scsi_host_template iscsi_iser_sht = {
 	.module                 = THIS_MODULE,
 	.name                   = "iSCSI Initiator over iSER",
@@ -994,7 +974,6 @@ static struct scsi_host_template iscsi_iser_sht = {
 	.eh_device_reset_handler= iscsi_eh_device_reset,
 	.eh_target_reset_handler = iscsi_eh_recover_target,
 	.target_alloc		= iscsi_target_alloc,
-	.slave_alloc            = iscsi_iser_slave_alloc,
 	.proc_name              = "iscsi_iser",
 	.this_id                = -1,
 	.track_queue_depth	= 1,
-- 
2.20.1