net/smc: send response to test link signal

With SMC-D z/OS sends a test link signal every 10 seconds. Linux is
supposed to answer, otherwise the SMC-D connection breaks.

Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 34 insertions, 0 deletions

diff --git a/net/smc/smc_ism.c b/net/smc/smc_ism.c
index cfade7fdcc6d..e36f21ce7252 100644
--- a/net/smc/smc_ism.c
+++ b/net/smc/smc_ism.c
@@ -184,6 +184,37 @@ struct smc_ism_event_work {
         struct smcd_event event;
 };
 
+#define ISM_EVENT_REQUEST               0x0001
+#define ISM_EVENT_RESPONSE              0x0002
+#define ISM_EVENT_REQUEST_IR            0x00000001
+#define ISM_EVENT_CODE_TESTLINK         0x83
+
+static void smcd_handle_sw_event(struct smc_ism_event_work *wrk)
+{
+        union {
+                u64     info;
+                struct {
+                        u32             uid;
+                        unsigned short  vlanid;
+                        u16             code;
+                };
+        } ev_info;
+
+        switch (wrk->event.code) {
+        case ISM_EVENT_CODE_TESTLINK:   /* Activity timer */
+                ev_info.info = wrk->event.info;
+                if (ev_info.code == ISM_EVENT_REQUEST) {
+                        ev_info.code = ISM_EVENT_RESPONSE;
+                        wrk->smcd->ops->signal_event(wrk->smcd,
+                                                     wrk->event.tok,
+                                                     ISM_EVENT_REQUEST_IR,
+                                                     ISM_EVENT_CODE_TESTLINK,
+                                                     ev_info.info);
+                        }
+                break;
+        }
+}
+
 /* worker for SMC-D events */
 static void smc_ism_event_work(struct work_struct *work)
 {
@@ -196,6 +227,9 @@ static void smc_ism_event_work(struct work_struct *work)
                 break;
         case ISM_EVENT_DMB:
                 break;
+        case ISM_EVENT_SWR:     /* Software defined event */
+                smcd_handle_sw_event(wrk);
+                break;
         }
         kfree(wrk);
 }