qcacld-3.0: Add GRO support to NAPI+Rx_thread processing model

GRO aggregations are hanging out of NAPI instance and We cannot use the
hif NAPI instance in Rx thread as gro_list inside NAPI is flushed out
at the start and end of NAPI poll, this will corrupt the gro_list on
which rx_thread is working. Address this concern by creating dummy
NAPI instances mapping to each hif NAPI and not scheduling them.

Change-Id: I6e1de57a669c56206a7863e86c3840bd0a9eabc1
CRs-Fixed: 2128450

core/dp/txrx/ol_txrx.c

@@ -5462,6 +5462,148 @@ static QDF_STATUS ol_txrx_register_pause_cb(struct cdp_soc_t *soc,
 }
 #endif
 
+#ifdef RECEIVE_OFFLOAD
+/**
+ * ol_txrx_offld_flush_handler() - offld flush handler
+ * @context: dev handle
+ * @rxpkt: rx data
+ * @staid: station id
+ *
+ * This function handles an offld flush indication.
+ * If the rx thread is enabled, it will be invoked by the rx
+ * thread else it will be called in the tasklet context
+ *
+ * Return: none
+ */
+static void ol_txrx_offld_flush_handler(void *context,
+				      void *rxpkt,
+				      uint16_t staid)
+{
+	ol_txrx_pdev_handle pdev = cds_get_context(QDF_MODULE_ID_TXRX);
+
+	if (qdf_unlikely(!pdev)) {
+		ol_txrx_err("Invalid context");
+		qdf_assert(0);
+		return;
+	}
+
+	if (pdev->offld_flush_cb)
+		pdev->offld_flush_cb(context);
+	else
+		ol_txrx_err("offld_flush_cb NULL");
+}
+
+/**
+ * ol_txrx_offld_flush() - offld flush callback
+ * @data: opaque data pointer
+ *
+ * This is the callback registered with CE to trigger
+ * an offld flush
+ *
+ * Return: none
+ */
+static void ol_txrx_offld_flush(void *data)
+{
+	p_cds_sched_context sched_ctx = get_cds_sched_ctxt();
+	struct cds_ol_rx_pkt *pkt;
+	ol_txrx_pdev_handle pdev = cds_get_context(QDF_MODULE_ID_TXRX);
+
+	if (qdf_unlikely(!sched_ctx))
+		return;
+
+	if (!ol_cfg_is_rx_thread_enabled(pdev->ctrl_pdev)) {
+		ol_txrx_offld_flush_handler(data, NULL, 0);
+	} else {
+		pkt = cds_alloc_ol_rx_pkt(sched_ctx);
+		if (qdf_unlikely(!pkt)) {
+			ol_txrx_err("Not able to allocate context");
+			return;
+		}
+
+		pkt->callback = ol_txrx_offld_flush_handler;
+		pkt->context = data;
+		pkt->Rxpkt = NULL;
+		pkt->staId = 0;
+		cds_indicate_rxpkt(sched_ctx, pkt);
+	}
+}
+
+/**
+ * ol_register_offld_flush_cb() - register the offld flush callback
+ * @offld_flush_cb: flush callback function
+ * @offld_init_cb: Allocate and initialize offld data structure.
+ *
+ * Store the offld flush callback provided and in turn
+ * register OL's offld flush handler with CE
+ *
+ * Return: none
+ */
+static void ol_register_offld_flush_cb(void (offld_flush_cb)(void *))
+{
+	struct hif_opaque_softc *hif_device;
+	struct ol_txrx_pdev_t *pdev = cds_get_context(QDF_MODULE_ID_TXRX);
+
+	if (pdev == NULL) {
+		ol_txrx_err("pdev NULL!");
+		TXRX_ASSERT2(0);
+		goto out;
+	}
+	if (pdev->offld_flush_cb != NULL) {
+		ol_txrx_info("offld already initialised");
+		if (pdev->offld_flush_cb != offld_flush_cb) {
+			ol_txrx_err(
+				   "offld_flush_cb is differ to previously registered callback")
+			TXRX_ASSERT2(0);
+			goto out;
+		}
+		goto out;
+	}
+	pdev->offld_flush_cb = offld_flush_cb;
+	hif_device = cds_get_context(QDF_MODULE_ID_HIF);
+
+	if (qdf_unlikely(hif_device == NULL)) {
+		ol_txrx_err("hif_device NULL!");
+		qdf_assert(0);
+		goto out;
+	}
+
+	hif_offld_flush_cb_register(hif_device, ol_txrx_offld_flush);
+
+out:
+	return;
+}
+
+/**
+ * ol_deregister_offld_flush_cb() - deregister the offld flush callback
+ *
+ * Remove the offld flush callback provided and in turn
+ * deregister OL's offld flush handler with CE
+ *
+ * Return: none
+ */
+static void ol_deregister_offld_flush_cb(void)
+{
+	struct hif_opaque_softc *hif_device;
+	struct ol_txrx_pdev_t *pdev = cds_get_context(QDF_MODULE_ID_TXRX);
+
+	if (pdev == NULL) {
+		ol_txrx_err("pdev NULL!");
+		return;
+	}
+	hif_device = cds_get_context(QDF_MODULE_ID_HIF);
+
+	if (qdf_unlikely(hif_device == NULL)) {
+		ol_txrx_err("hif_device NULL!");
+		qdf_assert(0);
+		return;
+	}
+
+	hif_offld_flush_cb_deregister(hif_device);
+
+	pdev->offld_flush_cb = NULL;
+}
+#endif /* RECEIVE_OFFLOAD */
+
 /**
  * ol_register_data_stall_detect_cb() - register data stall callback
  * @data_stall_detect_callback: data stall callback function
@@ -6009,6 +6151,13 @@ static struct cdp_ipa_ops ol_ops_ipa = {
 };
 #endif
 
+#ifdef RECEIVE_OFFLOAD
+static struct cdp_rx_offld_ops ol_rx_offld_ops = {
+	.register_rx_offld_flush_cb = ol_register_offld_flush_cb,
+	.deregister_rx_offld_flush_cb = ol_deregister_offld_flush_cb
+};
+#endif
+
 static struct cdp_bus_ops ol_ops_bus = {
 	.bus_suspend = ol_txrx_bus_suspend,
 	.bus_resume = ol_txrx_bus_resume
@@ -6131,6 +6280,9 @@ static struct cdp_ops ol_txrx_ops = {
 	.l_flowctl_ops = &ol_ops_l_flowctl,
 #ifdef IPA_OFFLOAD
 	.ipa_ops = &ol_ops_ipa,
+#endif
+#ifdef RECEIVE_OFFLOAD
+	.rx_offld_ops = &ol_rx_offld_ops,
 #endif
 	.bus_ops = &ol_ops_bus,
 	.ocb_ops = &ol_ops_ocb,

core/dp/txrx/ol_txrx_types.h

@@ -995,10 +995,7 @@ struct ol_txrx_pdev_t {
 	struct ol_txrx_peer_t *ocb_peer;
 	tx_pause_callback pause_cb;
 
-	struct {
-		void (*lro_flush_cb)(void *);
-		qdf_atomic_t lro_dev_cnt;
-	} lro_info;
+	void (*offld_flush_cb)(void *);
 	struct ol_txrx_peer_t *self_peer;
 	qdf_work_t peer_unmap_timer_work;
 

core/hdd/src/wlan_hdd_tx_rx.c

@@ -1516,8 +1516,9 @@ static void hdd_resolve_rx_ol_mode(struct hdd_context *hdd_ctx)
  */
 static QDF_STATUS hdd_gro_rx(struct hdd_adapter *adapter, struct sk_buff *skb)
 {
-	struct napi_struct *napi;
+	struct qca_napi_info *qca_napii;
 	struct qca_napi_data *napid;
+	struct napi_struct *napi_to_use;
 	QDF_STATUS status = QDF_STATUS_E_FAILURE;
 
 	/* Only enabling it for STA mode like LRO today */
@@ -1525,15 +1526,87 @@ static QDF_STATUS hdd_gro_rx(struct hdd_adapter *adapter, struct sk_buff *skb)
 		return QDF_STATUS_E_NOSUPPORT;
 
 	napid = hdd_napi_get_all();
-	napi = hif_get_napi(QDF_NBUF_CB_RX_CTX_ID(skb), napid);
+	if (unlikely(napid == NULL))
+		goto out;
+
+	qca_napii = hif_get_napi(QDF_NBUF_CB_RX_CTX_ID(skb), napid);
+	if (unlikely(qca_napii == NULL))
+		goto out;
+
 	skb_set_hash(skb, QDF_NBUF_CB_RX_FLOW_ID(skb), PKT_HASH_TYPE_L4);
+	/*
+	 * As we are breaking context in Rxthread mode, there is rx_thread NAPI
+	 * corresponds each hif_napi.
+	 */
+	if (adapter->hdd_ctx->enable_rxthread)
+		napi_to_use =  &qca_napii->rx_thread_napi;
+	else
+		napi_to_use = &qca_napii->napi;
 
-	if (GRO_DROP != napi_gro_receive(napi, skb))
-		status = QDF_STATUS_SUCCESS;
+	local_bh_disable();
+	napi_gro_receive(napi_to_use, skb);
+	local_bh_enable();
+
+	status = QDF_STATUS_SUCCESS;
+out:
 
 	return status;
 }
 
+/**
+ * hdd_rxthread_napi_gro_flush() - GRO flush callback for NAPI+Rx_Thread Rx mode
+ * @data: hif NAPI context
+ *
+ * Return: none
+ */
+static void hdd_rxthread_napi_gro_flush(void *data)
+{
+	struct qca_napi_info *qca_napii = (struct qca_napi_info *)data;
+
+	local_bh_disable();
+	/*
+	 * As we are breaking context in Rxthread mode, there is rx_thread NAPI
+	 * corresponds each hif_napi.
+	 */
+	napi_gro_flush(&qca_napii->rx_thread_napi, false);
+	local_bh_enable();
+}
+
+/**
+ * hdd_hif_napi_gro_flush() - GRO flush callback for NAPI Rx mode
+ * @data: hif NAPI context
+ *
+ * Return: none
+ */
+static void hdd_hif_napi_gro_flush(void *data)
+{
+	struct qca_napi_info *qca_napii = (struct qca_napi_info *)data;
+
+	local_bh_disable();
+	napi_gro_flush(&qca_napii->napi, false);
+	local_bh_enable();
+}
+
+#ifdef FEATURE_LRO
+/**
+ * hdd_qdf_lro_flush() - LRO flush wrapper
+ * @data: hif NAPI context
+ *
+ * Return: none
+ */
+static void hdd_qdf_lro_flush(void *data)
+{
+	struct qca_napi_info *qca_napii = (struct qca_napi_info *)data;
+	qdf_lro_ctx_t qdf_lro_ctx = qca_napii->lro_ctx;
+
+	qdf_lro_flush(qdf_lro_ctx);
+}
+#else
+static void hdd_qdf_lro_flush(void *data)
+{
+}
+#endif
+
 /**
  * hdd_register_rx_ol() - Register LRO/GRO rx processing callbacks
  *
@@ -1542,15 +1615,22 @@ static QDF_STATUS hdd_gro_rx(struct hdd_adapter *adapter, struct sk_buff *skb)
 static void hdd_register_rx_ol(void)
 {
 	struct hdd_context *hdd_ctx = cds_get_context(QDF_MODULE_ID_HDD);
+	void *soc = cds_get_context(QDF_MODULE_ID_SOC);
 
 	if  (!hdd_ctx)
 		hdd_err("HDD context is NULL");
 
 	if (hdd_ctx->ol_enable == CFG_LRO_ENABLED) {
-		/* Register the flush callback */
+		cdp_register_rx_offld_flush_cb(soc, hdd_qdf_lro_flush);
 		hdd_ctx->receive_offload_cb = hdd_lro_rx;
 		hdd_debug("LRO is enabled");
 	} else if (hdd_ctx->ol_enable == CFG_GRO_ENABLED) {
+		if (hdd_ctx->enable_rxthread)
+			cdp_register_rx_offld_flush_cb(soc,
+						hdd_rxthread_napi_gro_flush);
+		else
+			cdp_register_rx_offld_flush_cb(soc,
+						       hdd_hif_napi_gro_flush);
 		hdd_ctx->receive_offload_cb = hdd_gro_rx;
 		hdd_debug("GRO is enabled");
 	}
@@ -1587,7 +1667,7 @@ int hdd_rx_ol_init(struct hdd_context *hdd_ctx)
 			  LRO_IPV6_SEED_ARR_SZ));
 
 	if (0 != wma_lro_init(&lro_config)) {
-		hdd_err("Failed to send LRO configuration!");
+		hdd_err("Failed to send LRO/GRO configuration!");
 		hdd_ctx->ol_enable = 0;
 		return -EAGAIN;
 	}