[PATCH] ibmvscsis: Do not send aborted task response

Bryant G. Ly
2017-04-07T15:49:14Z

The driver is sending a response to the aborted task response
along with LIO sending the tmr response. SCSI spec says
that the initiator that sends the abort task TM NEVER gets a
response to the aborted op and with the current code it will
send a response. Thus this fix will remove that response if the
op is aborted.

Cc: <stable@vger.kernel.org> # v4.8+
Signed-off-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
---
drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c | 60 +++++++++++++++++++++-----------
drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.h | 1 +
2 files changed, 40 insertions(+), 21 deletions(-)

diff --git a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
index 4bb5635..8e2733f 100644
--- a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
+++ b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
@@ -1169,6 +1169,7 @@ static struct ibmvscsis_cmd *ibmvscsis_get_free_cmd(struct scsi_info *vscsi)
cmd = list_first_entry_or_null(&vscsi->free_cmd,
struct ibmvscsis_cmd, list);
if (cmd) {
+ cmd->flags &= ~(CMD_ABORTED);
list_del(&cmd->list);
cmd->iue = iue;
cmd->type = UNSET_TYPE;
@@ -1758,33 +1759,41 @@ static void ibmvscsis_send_messages(struct scsi_info *vscsi)

if (!(vscsi->flags & RESPONSE_Q_DOWN)) {
list_for_each_entry_safe(cmd, nxt, &vscsi->waiting_rsp, list) {
- iue = cmd->iue;
+ /*
+ * If an Abort flag is set then dont send response
+ */
+ if (cmd->flags & CMD_ABORTED) {
+ list_del(&cmd->list);
+ ibmvscsis_free_cmd_resources(vscsi, cmd);
+ } else {
+ iue = cmd->iue;

- crq->valid = VALID_CMD_RESP_EL;
- crq->format = cmd->rsp.format;
+ crq->valid = VALID_CMD_RESP_EL;
+ crq->format = cmd->rsp.format;

- if (cmd->flags & CMD_FAST_FAIL)
- crq->status = VIOSRP_ADAPTER_FAIL;
+ if (cmd->flags & CMD_FAST_FAIL)
+ crq->status = VIOSRP_ADAPTER_FAIL;

- crq->IU_length = cpu_to_be16(cmd->rsp.len);
+ crq->IU_length = cpu_to_be16(cmd->rsp.len);

- rc = h_send_crq(vscsi->dma_dev->unit_address,
- be64_to_cpu(msg_hi),
- be64_to_cpu(cmd->rsp.tag));
+ rc = h_send_crq(vscsi->dma_dev->unit_address,
+ be64_to_cpu(msg_hi),
+ be64_to_cpu(cmd->rsp.tag));

- pr_debug("send_messages: cmd %p, tag 0x%llx, rc %ld\n",
- cmd, be64_to_cpu(cmd->rsp.tag), rc);
+ pr_debug("send_messages: cmd %p, tag 0x%llx, rc %ld\n",
+ cmd, be64_to_cpu(cmd->rsp.tag), rc);

- /* if all ok free up the command element resources */
- if (rc == H_SUCCESS) {
- /* some movement has occurred */
- vscsi->rsp_q_timer.timer_pops = 0;
- list_del(&cmd->list);
+ /* if all ok free up the command element resources */
+ if (rc == H_SUCCESS) {
+ /* some movement has occurred */
+ vscsi->rsp_q_timer.timer_pops = 0;
+ list_del(&cmd->list);

- ibmvscsis_free_cmd_resources(vscsi, cmd);
- } else {
- srp_snd_msg_failed(vscsi, rc);
- break;
+ ibmvscsis_free_cmd_resources(vscsi, cmd);
+ } else {
+ srp_snd_msg_failed(vscsi, rc);
+ break;
+ }
}
}

@@ -3581,9 +3590,15 @@ static int ibmvscsis_write_pending(struct se_cmd *se_cmd)
{
struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
se_cmd);
+ struct scsi_info *vscsi = cmd->adapter;
struct iu_entry *iue = cmd->iue;
int rc;

+ if ((vscsi->flags & (CLIENT_FAILED | RESPONSE_Q_DOWN))) {
+ pr_err("write_pending failed since: %d\n", vscsi->flags);
+ return -EIO;
+ }
+
rc = srp_transfer_data(cmd, &vio_iu(iue)->srp.cmd, ibmvscsis_rdma,
1, 1);
if (rc) {
@@ -3674,7 +3689,10 @@ static void ibmvscsis_queue_tm_rsp(struct se_cmd *se_cmd)

static void ibmvscsis_aborted_task(struct se_cmd *se_cmd)
{
- /* TBD: What (if anything) should we do here? */
+ struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd,
+ se_cmd);
+
+ cmd->flags |= CMD_ABORTED;
pr_debug("ibmvscsis_aborted_task %p\n", se_cmd);
}

diff --git a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.h b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.h
index 98b0ca7..24db7a9 100644
--- a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.h
+++ b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.h
@@ -171,6 +171,7 @@ struct ibmvscsis_cmd {
unsigned char sense_buf[TRANSPORT_SENSE_BUFFER];
u64 init_time;
#define CMD_FAST_FAIL BIT(0)
+#define CMD_ABORTED BIT(1)
u32 flags;
char type;
};
--
2.5.4 (Apple Git-61)