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From: Bart Van Assche <bvanassche-HInyCGIudOg@public.gmane.org>
To: Roland Dreier <roland-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: James Bottomley
	<jbottomley-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>,
	Sagi Grimberg <sagig-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
	David Dillow <dave-i1Mk8JYDVaaSihdK6806/g@public.gmane.org>,
	Sebastian Parschauer
	<sebastian.riemer-EIkl63zCoXaH+58JC4qpiA@public.gmane.org>,
	linux-rdma <linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"linux-scsi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-scsi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: [PATCH v2 3/4] IB/srp: Fix residual handling
Date: Wed, 09 Jul 2014 15:57:51 +0200	[thread overview]
Message-ID: <53BD4A5F.6070708@acm.org> (raw)
In-Reply-To: <53BD49E3.3090903-HInyCGIudOg@public.gmane.org>

>From Documentation/scsi/scsi_mid_low_api.txt: "resid - an LLD should
set this signed integer to the requested transfer length (i.e.
'request_bufflen') less the number of bytes that are actually
transferred." This means that resid > 0 in case of an underrun and
also that resid < 0 in case of an overrun. Modify the SRP initiator
code such that it matches this requirement.

Signed-off-by: Bart Van Assche <bvanassche-HInyCGIudOg@public.gmane.org>
Reviewed-by: Sagi Grimberg <sagig-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Reviewed-by: David Dillow <dave-i1Mk8JYDVaaSihdK6806/g@public.gmane.org>
Cc: Sebastian Parschauer <sebastian.riemer-EIkl63zCoXaH+58JC4qpiA@public.gmane.org>
---
 drivers/infiniband/ulp/srp/ib_srp.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 8bcdde8..6894822 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -1644,10 +1644,14 @@ static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
 				     SCSI_SENSE_BUFFERSIZE));
 		}
 
-		if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
-			scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
-		else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
+		if (unlikely(rsp->flags & SRP_RSP_FLAG_DIUNDER))
 			scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
+		else if (unlikely(rsp->flags & SRP_RSP_FLAG_DIOVER))
+			scsi_set_resid(scmnd, -be32_to_cpu(rsp->data_in_res_cnt));
+		else if (unlikely(rsp->flags & SRP_RSP_FLAG_DOUNDER))
+			scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
+		else if (unlikely(rsp->flags & SRP_RSP_FLAG_DOOVER))
+			scsi_set_resid(scmnd, -be32_to_cpu(rsp->data_out_res_cnt));
 
 		srp_free_req(target, req, scmnd,
 			     be32_to_cpu(rsp->req_lim_delta));
-- 
1.8.4.5

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  parent reply	other threads:[~2014-07-09 13:57 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-07-09 13:55 [PATCH v2 0/4] SRP initiator patches for kernel 3.17 Bart Van Assche
     [not found] ` <53BD49E3.3090903-HInyCGIudOg@public.gmane.org>
2014-07-09 13:56   ` [PATCH v2 1/4] scsi_transport_srp: Fix fast_io_fail_tmo=dev_loss_tmo=off behavior Bart Van Assche
2014-07-09 13:57   ` [PATCH v2 2/4] IB/srp: Fix deadlock between host removal and multipathd Bart Van Assche
2014-07-09 13:57   ` Bart Van Assche [this message]
     [not found]     ` <53BD4A5F.6070708-HInyCGIudOg@public.gmane.org>
2014-07-10  4:07       ` [PATCH v2 3/4] IB/srp: Fix residual handling David Dillow
2014-07-09 13:58   ` [PATCH v2 4/4] IB/srp: Use P_Key cache for P_Key lookups Bart Van Assche

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