[PATCH v1 12/13] IB/iser: Implement check_protection

Sagi Grimberg
2014-02-27T11:13:08Z

Once the iSCSI transaction is completed we must
imeplement check_protection in order to notify
on DIF errors that may have occured.

The routine boils down to calling ib_check_mr_status
to get the signature status of the transaction.

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Alex Tabachnik <alext@mellanox.com>
---
drivers/infiniband/ulp/iser/iscsi_iser.c | 13 ++++++++
drivers/infiniband/ulp/iser/iscsi_iser.h | 2 +
drivers/infiniband/ulp/iser/iser_verbs.c | 45 ++++++++++++++++++++++++++++++
3 files changed, 60 insertions(+), 0 deletions(-)

diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c
index a64b878..f13d7e9 100644
--- a/drivers/infiniband/ulp/iser/iscsi_iser.c
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -306,6 +306,18 @@ static void iscsi_iser_cleanup_task(struct iscsi_task *task)
}
}

+static u8 iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector)
+{
+ struct iscsi_iser_task *iser_task = task->dd_data;
+
+ if (iser_task->dir[ISER_DIR_IN])
+ return iser_check_task_pi_status(iser_task, ISER_DIR_IN,
+ sector);
+ else
+ return iser_check_task_pi_status(iser_task, ISER_DIR_OUT,
+ sector);
+}
+
static struct iscsi_cls_conn *
iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
{
@@ -742,6 +754,7 @@ static struct iscsi_transport iscsi_iser_transport = {
.xmit_task = iscsi_iser_task_xmit,
.cleanup_task = iscsi_iser_cleanup_task,
.alloc_pdu = iscsi_iser_pdu_alloc,
+ .check_protection = iscsi_iser_check_protection,
/* recovery */
.session_recovery_timedout = iscsi_session_recovery_timedout,

diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.h b/drivers/infiniband/ulp/iser/iscsi_iser.h
index fce5409..95f291f 100644
--- a/drivers/infiniband/ulp/iser/iscsi_iser.h
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.h
@@ -483,4 +483,6 @@ int iser_create_fmr_pool(struct iser_conn *ib_conn, unsigned cmds_max);
void iser_free_fmr_pool(struct iser_conn *ib_conn);
int iser_create_fastreg_pool(struct iser_conn *ib_conn, unsigned cmds_max);
void iser_free_fastreg_pool(struct iser_conn *ib_conn);
+u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
+ enum iser_data_dir cmd_dir, sector_t *sector);
#endif
diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c b/drivers/infiniband/ulp/iser/iser_verbs.c
index 0404c71..617d490 100644
--- a/drivers/infiniband/ulp/iser/iser_verbs.c
+++ b/drivers/infiniband/ulp/iser/iser_verbs.c
@@ -1153,3 +1153,48 @@ static void iser_cq_callback(struct ib_cq *cq, void *cq_context)

tasklet_schedule(&device->cq_tasklet[cq_index]);
}
+
+u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
+ enum iser_data_dir cmd_dir, sector_t *sector)
+{
+ struct iser_mem_reg *reg = &iser_task->rdma_regd[cmd_dir].reg;
+ struct fast_reg_descriptor *desc = reg->mem_h;
+ unsigned long sector_size = iser_task->sc->device->sector_size;
+ struct ib_mr_status mr_status;
+ int ret;
+
+ if (desc && desc->reg_indicators & ISER_FASTREG_PROTECTED) {
+ desc->reg_indicators &= ~ISER_FASTREG_PROTECTED;
+ ret = ib_check_mr_status(desc->pi_ctx->sig_mr,
+ IB_MR_CHECK_SIG_STATUS, &mr_status);
+ if (ret) {
+ pr_err("ib_check_mr_status failed, ret %d\n", ret);
+ goto err;
+ }
+
+ if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
+ *sector = mr_status.sig_err.sig_err_offset;
+
+ do_div(*sector, sector_size + 8);
+ pr_err("PI error found type %d at sector %lx "
+ "expected %x vs actual %x\n",
+ mr_status.sig_err.err_type, *sector,
+ mr_status.sig_err.expected,
+ mr_status.sig_err.actual);
+
+ switch (mr_status.sig_err.err_type) {
+ case IB_SIG_BAD_GUARD:
+ return 0x1;
+ case IB_SIG_BAD_REFTAG:
+ return 0x3;
+ case IB_SIG_BAD_APPTAG:
+ return 0x2;
+ }
+ }
+ }
+
+ return 0;
+err:
+ /* Not alot we can do here, return ambiguous guard error */
+ return 0x1;
+}
--
1.7.1