Fix p2p service discovery
- Fix listen timing to improve SD reliability
- Fix SD packet scheduling
Bug: 6629112
Change-Id: I01365279439116256372d019bdbfd4b2113bf2ce
diff --git a/src/p2p/p2p.c b/src/p2p/p2p.c
index a010699..aeeaccb 100644
--- a/src/p2p/p2p.c
+++ b/src/p2p/p2p.c
@@ -121,6 +121,11 @@
wpa_msg(p2p->cfg->msg_ctx, MSG_ERROR, "P2P: Expiring old peer "
"entry " MACSTR, MAC2STR(dev->info.p2p_device_addr));
+#ifdef ANDROID_P2P
+ /* SD_FAIR_POLICY: Update the current sd_dev_list pointer to next device */
+ if(&dev->list == p2p->sd_dev_list)
+ p2p->sd_dev_list = dev->list.next;
+#endif
dl_list_del(&dev->list);
p2p_device_free(p2p, dev);
}
@@ -413,6 +418,11 @@
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Remove oldest peer entry to make room for a new "
"peer");
+#ifdef ANDROID_P2P
+ /* SD_FAIR_POLICY: Update the current sd_dev_list pointer to next device */
+ if(&oldest->list == p2p->sd_dev_list)
+ p2p->sd_dev_list = oldest->list.next;
+#endif
dl_list_del(&oldest->list);
p2p_device_free(p2p, oldest);
}
@@ -572,7 +582,6 @@
dev->ext_listen_interval =
WPA_GET_LE16(msg->ext_listen_timing + 2);
}
-
if (!probe_req) {
dev->info.config_methods = msg->config_methods ?
msg->config_methods : msg->wps_config_methods;
@@ -897,7 +906,15 @@
p2p->after_scan_tx->wait_time);
os_free(p2p->after_scan_tx);
p2p->after_scan_tx = NULL;
+#ifdef ANDROID_P2P
+ /* For SD frames, there is a scenario, where we can receive a SD request frame during p2p_scan.
+ * At that moment, we will send the SD response from this context. After sending the SD response,
+ * we need to continue p2p_find. But if we return 1 from here, p2p_find is going to be stopped.
+ */
+ return 0;
+#else
return 1;
+#endif
}
op = p2p->start_after_scan;
@@ -2239,8 +2256,16 @@
p2p->cfg->model_number = os_strdup(cfg->model_number);
if (cfg->serial_number)
p2p->cfg->serial_number = os_strdup(cfg->serial_number);
-
+#ifdef ANDROID_P2P
+ /* 100ms listen time is too less to receive the response frames in some scenarios
+ * increasing min listen time to 200ms.
+ */
+ p2p->min_disc_int = 2;
+ /* SD_FAIR_POLICY: Initializing the SD current serviced pointer to NULL */
+ p2p->sd_dev_list = NULL;
+#else
p2p->min_disc_int = 1;
+#endif
p2p->max_disc_int = 3;
os_get_random(&p2p->next_tie_breaker, 1);
@@ -2299,6 +2324,10 @@
dl_list_del(&dev->list);
p2p_device_free(p2p, dev);
}
+#ifdef ANDROID_P2P
+ /* SD_FAIR_POLICY: Initializing the SD current serviced pointer to NULL */
+ p2p->sd_dev_list = NULL;
+#endif
p2p_free_sd_queries(p2p);
os_free(p2p->after_scan_tx);
p2p->after_scan_tx = NULL;
@@ -2477,8 +2506,37 @@
void p2p_continue_find(struct p2p_data *p2p)
{
struct p2p_device *dev;
+#ifdef ANDROID_P2P
+ int skip=1;
+#endif
p2p_set_state(p2p, P2P_SEARCH);
dl_list_for_each(dev, &p2p->devices, struct p2p_device, list) {
+#ifdef ANDROID_P2P
+ /* SD_FAIR_POLICY: We need to give chance to all devices in the device list
+ * There may be a scenario, where a particular peer device have
+ * not registered any query response. When we send a SD request to such device,
+ * no response will be received. And if we continue to get probe responses from that device,
+ * and if that device happens to be on top in our device list,
+ * we will always continue to send SD requests always to that peer only.
+ * We will not be able to send SD requests to other devices in that case.
+ * This implementation keeps track of last serviced peer device.
+ * And then takes the next one from the device list, in the next iteration.
+ */
+ if (p2p->sd_dev_list && p2p->sd_dev_list != &p2p->devices) {
+ if(skip) {
+ if ((&dev->list == p2p->sd_dev_list) ) {
+ skip = 0;
+ if (dev->list.next == &p2p->devices)
+ p2p->sd_dev_list = NULL;
+ }
+ continue;
+ }
+ }
+ p2p->sd_dev_list = &dev->list;
+ wpa_printf(MSG_DEBUG, "P2P: ### Servicing %p dev->flags 0x%x SD schedule %s devaddr " MACSTR,
+ p2p->sd_dev_list, dev->flags, dev->flags & P2P_DEV_SD_SCHEDULE ? "TRUE": "FALSE",
+ MAC2STR(dev->info.p2p_device_addr));
+#endif
if (dev->flags & P2P_DEV_SD_SCHEDULE) {
if (p2p_start_sd(p2p, dev) == 0)
return;