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From: Bart Van Assche <bvanassche@acm.org>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Leon Romanovsky <leonro@mellanox.com>,
	Doug Ledford <dledford@redhat.com>,
	linux-rdma@vger.kernel.org, Bart Van Assche <bvanassche@acm.org>,
	Honggang LI <honli@redhat.com>,
	Laurence Oberman <loberman@redhat.com>
Subject: [PATCH] RDMA/srpt: Report the SCSI residual to the initiator
Date: Tue,  5 Nov 2019 13:46:32 -0800
Message-ID: <20191105214632.183302-1-bvanassche@acm.org> (raw)

The code added by this patch is similar to the code that already exists
in ibmvscsis_determine_resid(). This patch has been tested by running
the following command:

strace sg_raw -r 1k /dev/sdb 12 00 00 00 60 00 -o inquiry.bin |&
    grep resid=

Cc: Honggang LI <honli@redhat.com>
Cc: Laurence Oberman <loberman@redhat.com>
Fixes: a42d985bd5b2 ("ib_srpt: Initial SRP Target merge for v3.3-rc1")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 drivers/infiniband/ulp/srpt/ib_srpt.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
index 653de1583cf9..23c782e3d49a 100644
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -1362,9 +1362,11 @@ static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch,
 			      struct srpt_send_ioctx *ioctx, u64 tag,
 			      int status)
 {
+	struct se_cmd *cmd = &ioctx->cmd;
 	struct srp_rsp *srp_rsp;
 	const u8 *sense_data;
 	int sense_data_len, max_sense_len;
+	u32 resid = cmd->residual_count;
 
 	/*
 	 * The lowest bit of all SAM-3 status codes is zero (see also
@@ -1386,6 +1388,28 @@ static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch,
 	srp_rsp->tag = tag;
 	srp_rsp->status = status;
 
+	if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
+		if (cmd->data_direction == DMA_TO_DEVICE) {
+			/* residual data from an underflow write */
+			srp_rsp->flags = SRP_RSP_FLAG_DOUNDER;
+			srp_rsp->data_out_res_cnt = cpu_to_be32(resid);
+		} else if (cmd->data_direction == DMA_FROM_DEVICE) {
+			/* residual data from an underflow read */
+			srp_rsp->flags = SRP_RSP_FLAG_DIUNDER;
+			srp_rsp->data_in_res_cnt = cpu_to_be32(resid);
+		}
+	} else if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
+		if (cmd->data_direction == DMA_TO_DEVICE) {
+			/* residual data from an overflow write */
+			srp_rsp->flags = SRP_RSP_FLAG_DOOVER;
+			srp_rsp->data_out_res_cnt = cpu_to_be32(resid);
+		} else if (cmd->data_direction == DMA_FROM_DEVICE) {
+			/* residual data from an overflow read */
+			srp_rsp->flags = SRP_RSP_FLAG_DIOVER;
+			srp_rsp->data_in_res_cnt = cpu_to_be32(resid);
+		}
+	}
+
 	if (sense_data_len) {
 		BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp));
 		max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp);

             reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-05 21:46 Bart Van Assche [this message]
2019-11-05 21:47 ` Bart Van Assche
2019-11-06  3:13 ` Honggang LI
2019-11-14  3:53   ` Bart Van Assche
2019-11-14 14:10 ` Jason Gunthorpe
  -- strict thread matches above, loose matches on Subject: below --
2019-10-29 23:02 Bart Van Assche
2019-11-04 11:10 ` Honggang LI
2019-11-04 16:01   ` Bart Van Assche

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