3 files changed, 24 insertions, 0 deletions

diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c
index dd03cfe596d6..cfa952e9ac90 100644
--- a/drivers/infiniband/ulp/iser/iscsi_iser.c
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -82,6 +82,8 @@ static unsigned int iscsi_max_lun = 512;
 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
 
 int iser_debug_level = 0;
+bool iser_pi_enable = false;
+int iser_pi_guard = 0;
 
 MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover");
 MODULE_LICENSE("Dual BSD/GPL");
@@ -91,6 +93,12 @@ MODULE_VERSION(DRV_VER);
 module_param_named(debug_level, iser_debug_level, int, 0644);
 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
 
+module_param_named(pi_enable, iser_pi_enable, bool, 0644);
+MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)");
+
+module_param_named(pi_guard, iser_pi_guard, int, 0644);
+MODULE_PARM_DESC(pi_guard, "T10-PI guard_type, 0:CRC|1:IP_CSUM (default:CRC)");
+
 struct iser_global ig;
 
 void
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.h b/drivers/infiniband/ulp/iser/iscsi_iser.h
index 623defa187b2..011003f04253 100644
--- a/drivers/infiniband/ulp/iser/iscsi_iser.h
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.h
@@ -317,6 +317,7 @@ struct iser_conn {
         unsigned int                 rx_desc_head;
         struct iser_rx_desc          *rx_descs;
         struct ib_recv_wr            rx_wr[ISER_MIN_POSTED_RX];
+        bool                         pi_support;
 
         /* Connection memory registration pool */
         union {
@@ -371,6 +372,8 @@ struct iser_global {
 
 extern struct iser_global ig;
 extern int iser_debug_level;
+extern bool iser_pi_enable;
+extern int iser_pi_guard;
 
 /* allocate connection resources needed for rdma functionality */
 int iser_conn_set_full_featured_mode(struct iscsi_conn *conn);
diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c b/drivers/infiniband/ulp/iser/iser_verbs.c
index 6a5f4245182a..4c27f553df39 100644
--- a/drivers/infiniband/ulp/iser/iser_verbs.c
+++ b/drivers/infiniband/ulp/iser/iser_verbs.c
@@ -607,6 +607,19 @@ static int iser_addr_handler(struct rdma_cm_id *cma_id)
         ib_conn = (struct iser_conn *)cma_id->context;
         ib_conn->device = device;
 
+        /* connection T10-PI support */
+        if (iser_pi_enable) {
+                if (!(device->dev_attr.device_cap_flags &
+                      IB_DEVICE_SIGNATURE_HANDOVER)) {
+                        iser_warn("T10-PI requested but not supported on %s, "
+                                  "continue without T10-PI\n",
+                                  ib_conn->device->ib_device->name);
+                        ib_conn->pi_support = false;
+                } else {
+                        ib_conn->pi_support = true;
+                }
+        }
+
         ret = rdma_resolve_route(cma_id, 1000);
         if (ret) {
                 iser_err("resolve route failed: %d\n", ret);