Received-SPF: pass (google.com: domain of linux-bluetooth-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Sender: "danielwinkler via sendgmr" 
        <danielwinkler@danielwinkler-linux.mtv.corp.google.com>
Date:   Wed,  3 Mar 2021 11:20:09 -0800
In-Reply-To: <20210303192012.1695032-1-danielwinkler@google.com>
Message-Id: <20210303111817.Bluez.1.I1411482bfff45aecdec1bc8c895fc7148ee3f50c@changeid>
Mime-Version: 1.0
References: <20210303192012.1695032-1-danielwinkler@google.com>
Subject: [Bluez PATCH 1/3] advertising: Generate advertising data earlier in pipeline
From:   Daniel Winkler <danielwinkler@google.com>
To:     linux-bluetooth@vger.kernel.org, luiz.dentz@gmail.com
Cc:     chromeos-bluetooth-upstreaming@chromium.org,
        Daniel Winkler <danielwinkler@google.com>,
        Alain Michaud <alainm@chromium.org>,
        Sonny Sasaka <sonnysasaka@chromium.org>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

This change moves the advertising data generation to the beginning of
the registration pipeline. This is necessary for the following patch,
which will need to know whether the scan response data is existent so
that the parameter request can be populated correctly.

Reviewed-by: Alain Michaud <alainm@chromium.org>
Reviewed-by: Sonny Sasaka <sonnysasaka@chromium.org>

---

 src/advertising.c | 79 +++++++++++++++++++++++++----------------------
 1 file changed, 42 insertions(+), 37 deletions(-)

diff --git a/src/advertising.c b/src/advertising.c
index 15a343e52..f3dc357a1 100644
--- a/src/advertising.c
+++ b/src/advertising.c
@@ -80,6 +80,10 @@ struct btd_adv_client {
 	uint32_t flags;
 	struct bt_ad *data;
 	struct bt_ad *scan;
+	uint8_t *adv_data;
+	uint8_t *scan_rsp;
+	size_t adv_data_len;
+	size_t scan_rsp_len;
 	uint8_t instance;
 	uint32_t min_interval;
 	uint32_t max_interval;
@@ -141,6 +145,16 @@ static void client_free(void *data)
 	bt_ad_unref(client->data);
 	bt_ad_unref(client->scan);
 
+	if (client->adv_data) {
+		free(client->adv_data);
+		client->adv_data = NULL;
+	}
+
+	if (client->scan_rsp) {
+		free(client->scan_rsp);
+		client->scan_rsp = NULL;
+	}
+
 	g_dbus_proxy_unref(client->proxy);
 
 	if (client->owner)
@@ -915,6 +929,22 @@ static int refresh_extended_adv(struct btd_adv_client *client,
 		flags |= MGMT_ADV_PARAM_TX_POWER;
 	}
 
+	client->adv_data = generate_adv_data(client, &flags,
+						&client->adv_data_len);
+	if (!client->adv_data ||
+		(client->adv_data_len > calc_max_adv_len(client, flags))) {
+		error("Advertising data too long or couldn't be generated.");
+		return -EINVAL;
+	}
+
+	client->scan_rsp = generate_scan_rsp(client, &flags,
+						&client->scan_rsp_len);
+	if (!client->scan_rsp && client->scan_rsp_len) {
+		error("Scan data couldn't be generated.");
+		free(client->adv_data);
+		return -EINVAL;
+	}
+
 	cp.flags = htobl(flags);
 
 	mgmt_ret = mgmt_send(client->manager->mgmt, MGMT_OP_ADD_EXT_ADV_PARAMS,
@@ -1222,11 +1252,6 @@ static void add_adv_params_callback(uint8_t status, uint16_t length,
 	const struct mgmt_rp_add_ext_adv_params *rp = param;
 	struct mgmt_cp_add_ext_adv_data *cp = NULL;
 	uint8_t param_len;
-	uint8_t *adv_data = NULL;
-	size_t adv_data_len;
-	uint8_t *scan_rsp = NULL;
-	size_t scan_rsp_len = -1;
-	uint32_t flags = 0;
 	unsigned int mgmt_ret;
 	dbus_int16_t tx_power;
 
@@ -1248,23 +1273,8 @@ static void add_adv_params_callback(uint8_t status, uint16_t length,
 
 	client->instance = rp->instance;
 
-	flags = get_adv_flags(client);
-
-	adv_data = generate_adv_data(client, &flags, &adv_data_len);
-	if (!adv_data || (adv_data_len > rp->max_adv_data_len)) {
-		error("Advertising data too long or couldn't be generated.");
-		goto fail;
-	}
-
-	scan_rsp = generate_scan_rsp(client, &flags, &scan_rsp_len);
-	if ((!scan_rsp && scan_rsp_len) ||
-			scan_rsp_len > rp->max_scan_rsp_len) {
-		error("Scan data couldn't be generated.");
-		goto fail;
-	}
-
-	param_len = sizeof(struct mgmt_cp_add_advertising) + adv_data_len +
-							scan_rsp_len;
+	param_len = sizeof(struct mgmt_cp_add_advertising) +
+			client->adv_data_len + client->scan_rsp_len;
 
 	cp = malloc0(param_len);
 	if (!cp) {
@@ -1273,15 +1283,11 @@ static void add_adv_params_callback(uint8_t status, uint16_t length,
 	}
 
 	cp->instance = client->instance;
-	cp->adv_data_len = adv_data_len;
-	cp->scan_rsp_len = scan_rsp_len;
-	memcpy(cp->data, adv_data, adv_data_len);
-	memcpy(cp->data + adv_data_len, scan_rsp, scan_rsp_len);
-
-	free(adv_data);
-	free(scan_rsp);
-	adv_data = NULL;
-	scan_rsp = NULL;
+	cp->adv_data_len = client->adv_data_len;
+	cp->scan_rsp_len = client->scan_rsp_len;
+	memcpy(cp->data, client->adv_data, client->adv_data_len);
+	memcpy(cp->data + client->adv_data_len, client->scan_rsp,
+			client->scan_rsp_len);
 
 	/* Submit request to update instance data */
 	mgmt_ret = mgmt_send(client->manager->mgmt, MGMT_OP_ADD_EXT_ADV_DATA,
@@ -1305,12 +1311,6 @@ static void add_adv_params_callback(uint8_t status, uint16_t length,
 	return;
 
 fail:
-	if (adv_data)
-		free(adv_data);
-
-	if (scan_rsp)
-		free(scan_rsp);
-
 	if (cp)
 		free(cp);
 
@@ -1454,6 +1454,11 @@ static struct btd_adv_client *client_create(struct btd_adv_manager *manager,
 	if (!client->scan)
 		goto fail;
 
+	client->adv_data = NULL;
+	client->scan_rsp = NULL;
+	client->adv_data_len = 0;
+	client->scan_rsp_len = 0;
+
 	client->manager = manager;
 	client->appearance = UINT16_MAX;
 	client->tx_power = ADV_TX_POWER_NO_PREFERENCE;
-- 
2.30.1.766.gb4fecdf3b7-goog