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Subject[PATCH net-next 1/1] net/smc: send response to test link signal
Date
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>
---
net/smc/smc_ism.c | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)

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);
}
--
2.16.4
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