On 08/28/2013 10:19 AM, Jack Wang wrote: > Hi, > > Below patch is new version which address comments from Bart. >
Hi Roland, Could you included this in your tree or do you need me resend it? Best regards, Jack > > From 62d87b4d546066b251e44a3cb468b16783df7ee4 Mon Sep 17 00:00:00 2001 > From: Jack Wang <[email protected]> > Date: Mon, 26 Aug 2013 15:50:03 +0200 > Subject: [PATCH] IB/srp: add change_queue_depth/change_queue_type support > > Currently, it's not possible to change queue depth for device > behind SRP host. Sometimes, we need to adjust queue_depth for > performance reason(eg storage busy, we need lower queue_depth > to avoid running into SCSI error handler), so this patch add > support for SRP driver. > > Signed-off-by: Jack Wang <[email protected]> > --- > drivers/infiniband/ulp/srp/ib_srp.c | 54 > +++++++++++++++++++++++++++++++++++ > 1 file changed, 54 insertions(+) > > diff --git a/drivers/infiniband/ulp/srp/ib_srp.c > b/drivers/infiniband/ulp/srp/ib_srp.c > index 06a3e4b..2713e02 100644 > --- a/drivers/infiniband/ulp/srp/ib_srp.c > +++ b/drivers/infiniband/ulp/srp/ib_srp.c > @@ -47,6 +47,7 @@ > #include <scsi/scsi.h> > #include <scsi/scsi_device.h> > #include <scsi/scsi_dbg.h> > +#include <scsi/scsi_tcq.h> > #include <scsi/srp.h> > #include <scsi/scsi_transport_srp.h> > > @@ -1875,6 +1876,57 @@ static int srp_cm_handler(struct ib_cm_id *cm_id, > struct ib_cm_event *event) > return 0; > } > > +/** > + * srp_change_queue_type - changing device queue tag type > + * @sdev: scsi device struct > + * @tag_type: requested tag type > + * > + * Returns queue tag type. > + */ > +static int > +srp_change_queue_type(struct scsi_device *sdev, int tag_type) > +{ > + if (sdev->tagged_supported) { > + scsi_set_tag_type(sdev, tag_type); > + if (tag_type) > + scsi_activate_tcq(sdev, sdev->queue_depth); > + else > + scsi_deactivate_tcq(sdev, sdev->queue_depth); > + } else > + tag_type = 0; > + > + return tag_type; > +} > + > +/** > + * srp_change_queue_depth - setting device queue depth > + * @sdev: scsi device struct > + * @qdepth: requested queue depth > + * @reason: SCSI_QDEPTH_DEFAULT/SCSI_QDEPTH_QFULL/SCSI_QDEPTH_RAMP_UP > + * (see include/scsi/scsi_host.h for definition) > + * > + * Returns queue depth. > + */ > +static int > +srp_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason) > +{ > + struct Scsi_Host *shost = sdev->host; > + int max_depth; > + if (reason == SCSI_QDEPTH_DEFAULT || reason == SCSI_QDEPTH_RAMP_UP) { > + max_depth = shost->can_queue; > + if (!sdev->tagged_supported) > + max_depth = 1; > + if (qdepth > max_depth) > + qdepth = max_depth; > + scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); > + } else if (reason == SCSI_QDEPTH_QFULL) > + scsi_track_queue_full(sdev, qdepth); > + else > + return -EOPNOTSUPP; > + > + return sdev->queue_depth; > +} > + > static int srp_send_tsk_mgmt(struct srp_target_port *target, > u64 req_tag, unsigned int lun, u8 func) > { > @@ -2260,6 +2312,8 @@ static struct scsi_host_template srp_template = { > .slave_configure = srp_slave_configure, > .info = srp_target_info, > .queuecommand = srp_queuecommand, > + .change_queue_depth = srp_change_queue_depth, > + .change_queue_type = srp_change_queue_type, > .eh_abort_handler = srp_abort, > .eh_device_reset_handler = srp_reset_device, > .eh_host_reset_handler = srp_reset_host, > -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
