qcacmn: Allocate hif_napi_info structures dynamically

The hif_napi_info structure has a dummy netdev included.
The dummy netdev is large.  Avoiding unneeded allocation
save 30kb of memory.  Dynamically allocating the
hif_napi_info structures also reduces the size of
the contiguous memory needed for the parent structure.

Change-Id: I58044e5b1d0a834b3b6d17f66d6f4b2462873f2a
CRs-Fixed: 2016355

hif/inc/hif.h

@@ -263,11 +263,12 @@ struct qca_napi_cpu {
 struct qca_napi_data {
 	qdf_spinlock_t           lock;
 	uint32_t             state;
+
 	/* bitmap of created/registered NAPI instances, indexed by pipe_id,
 	 * not used by clients (clients use an id returned by create)
 	 */
 	uint32_t             ce_map;
-	struct qca_napi_info napis[CE_COUNT_MAX];
+	struct qca_napi_info *napis[CE_COUNT_MAX];
 	struct qca_napi_cpu  napi_cpu[NR_CPUS];
 	int                  lilcl_head, bigcl_head;
 	enum qca_napi_tput_state napi_mode;

hif/src/hif_napi.c

@@ -137,6 +137,7 @@ int hif_napi_create(struct hif_opaque_softc   *hif_ctx,
 		rc = hif_napi_cpu_init(hif_ctx);
 		if (rc != 0) {
 			HIF_ERROR("NAPI_initialization failed,. %d", rc);
+			rc = napid->ce_map;
 			goto hnc_err;
 		}
 
@@ -153,8 +154,21 @@ int hif_napi_create(struct hif_opaque_softc   *hif_ctx,
 
 		/* Now this is a CE where we need NAPI on */
 		NAPI_DEBUG("Creating NAPI on pipe %d", i);
+		napii = qdf_mem_malloc(sizeof(*napii));
+		napid->napis[i] = napii;
+		if (!napii) {
+			NAPI_DEBUG("NAPI alloc failure %d", i);
+			rc = -ENOMEM;
+			goto napii_alloc_failure;
+		}
+	}
+
+	for (i = 0; i < hif->ce_count; i++) {
+		napii = napid->napis[i];
+		if (!napii)
+			continue;
 
-		napii = &(napid->napis[i]);
+		NAPI_DEBUG("initializing NAPI for pipe %d", i);
 		memset(napii, 0, sizeof(struct qca_napi_info));
 		napii->scale = scale;
 		napii->id    = NAPI_PIPE2ID(i);
@@ -193,10 +207,21 @@ int hif_napi_create(struct hif_opaque_softc   *hif_ctx,
 		HIF_DBG("%s: NAPI id %d created for pipe %d", __func__,
 			 napii->id, i);
 	}
+	NAPI_DEBUG("napi map = %x", napid->ce_map);
 	NAPI_DEBUG("NAPI ids created for all applicable pipes");
+	return napid->ce_map;
+
+napii_alloc_failure:
+	for (i = 0; i < hif->ce_count; i++) {
+		napii = napid->napis[i];
+		napid->napis[i] = NULL;
+		if (napii)
+			qdf_mem_free(napii);
+	}
+
 hnc_err:
 	NAPI_DEBUG("<--napi_instances_map=%x]", napid->ce_map);
-	return napid->ce_map;
+	return rc;
 }
 
 /**
@@ -235,13 +260,23 @@ int hif_napi_destroy(struct hif_opaque_softc *hif_ctx,
 	} else if (0 == (hif->napi_data.ce_map & (0x01 << ce))) {
 		HIF_ERROR("%s: NAPI instance %d (pipe %d) not created",
 			  __func__, id, ce);
+		if (hif->napi_data.napis[ce])
+			HIF_ERROR("%s: memory allocated but ce_map not set %d (pipe %d)",
+				  __func__, id, ce);
 		rc = -EINVAL;
 	} else {
 		struct qca_napi_data *napid;
 		struct qca_napi_info *napii;
 
 		napid = &(hif->napi_data);
-		napii = &(napid->napis[ce]);
+		napii = napid->napis[ce];
+		if (!napii) {
+			if (napid->ce_map & (0x01 << ce))
+				HIF_ERROR("%s: napii & ce_map out of sync(ce %d)",
+					  __func__, ce);
+			return -EINVAL;
+		}
+
 
 		if (hif->napi_data.state == HIF_NAPI_CONF_UP) {
 			if (force) {
@@ -269,7 +304,9 @@ int hif_napi_destroy(struct hif_opaque_softc *hif_ctx,
 			netif_napi_del(&(napii->napi));
 
 			napid->ce_map &= ~(0x01 << ce);
+			napid->napis[ce] = NULL;
 			napii->scale  = 0;
+			qdf_mem_free(napii);
 			HIF_DBG("%s: NAPI %d destroyed\n", __func__, id);
 
 			/* if there are no active instances and
@@ -310,9 +347,11 @@ void *hif_napi_get_lro_info(struct hif_opaque_softc *hif_hdl, int napi_id)
 	struct qca_napi_info *napii;
 
 	napid = &(scn->napi_data);
-	napii = &(napid->napis[NAPI_ID2PIPE(napi_id)]);
+	napii = napid->napis[NAPI_ID2PIPE(napi_id)];
 
-	return napii->lro_ctx;
+	if (napii)
+		return napii->lro_ctx;
+	return 0;
 }
 
 /**
@@ -535,26 +574,28 @@ int hif_napi_event(struct hif_opaque_softc *hif_ctx, enum qca_napi_event event,
 	if (prev_state != napid->state) {
 		if (napid->state == ENABLE_NAPI_MASK) {
 			rc = 1;
-			for (i = 0; i < CE_COUNT_MAX; i++)
-				if ((napid->ce_map & (0x01 << i))) {
-					napi = &(napid->napis[i].napi);
+			for (i = 0; i < CE_COUNT_MAX; i++) {
+				struct qca_napi_info *napii = napid->napis[i];
+				if (napii) {
+					napi = &(napii->napi);
 					NAPI_DEBUG("%s: enabling NAPI %d",
 						   __func__, i);
 					napi_enable(napi);
 				}
+			}
 		} else {
 			rc = 0;
-			for (i = 0; i < CE_COUNT_MAX; i++)
-				if (napid->ce_map & (0x01 << i)) {
-					napi = &(napid->napis[i].napi);
+			for (i = 0; i < CE_COUNT_MAX; i++) {
+				struct qca_napi_info *napii = napid->napis[i];
+				if (napii) {
+					napi = &(napii->napi);
 					NAPI_DEBUG("%s: disabling NAPI %d",
 						   __func__, i);
 					napi_disable(napi);
 					/* in case it is affined, remove it */
-					irq_set_affinity_hint(
-							napid->napis[i].irq,
-							NULL);
+					irq_set_affinity_hint(napii->irq, NULL);
 				}
+			}
 		}
 	} else {
 		HIF_DBG("%s: no change in hif napi state (still %d)",
@@ -612,14 +653,22 @@ int hif_napi_schedule(struct hif_opaque_softc *hif_ctx, int ce_id)
 {
 	int cpu = smp_processor_id();
 	struct hif_softc *scn = HIF_GET_SOFTC(hif_ctx);
+	struct qca_napi_info *napii;
 
 	hif_record_ce_desc_event(scn,  ce_id, NAPI_SCHEDULE,
 				 NULL, NULL, 0);
 
-	scn->napi_data.napis[ce_id].stats[cpu].napi_schedules++;
-	NAPI_DEBUG("scheduling napi %d (ce:%d)",
-		   scn->napi_data.napis[ce_id].id, ce_id);
-	napi_schedule(&(scn->napi_data.napis[ce_id].napi));
+	napii = scn->napi_data.napis[ce_id];
+	if (qdf_unlikely(!napii)) {
+		HIF_ERROR("%s, scheduling unallocated napi (ce:%d)",
+			      __func__, ce_id);
+		qdf_atomic_dec(&scn->active_tasklet_cnt);
+		return false;
+	}
+
+	napii->stats[cpu].napi_schedules++;
+	NAPI_DEBUG("scheduling napi %d (ce:%d)", napii->id, ce_id);
+	napi_schedule(&(napii->napi));
 
 	return true;
 }
@@ -703,9 +752,6 @@ int hif_napi_poll(struct hif_opaque_softc *hif_ctx,
 	struct qca_napi_info *napi_info;
 	struct CE_state *ce_state = NULL;
 
-	NAPI_DEBUG("%s -->(napi(%d, irq=%d), budget=%d)",
-		   __func__, napi_info->id, napi_info->irq, budget);
-
 	if (unlikely(NULL == hif)) {
 		HIF_ERROR("%s: hif context is NULL", __func__);
 		QDF_ASSERT(0);
@@ -715,6 +761,9 @@ int hif_napi_poll(struct hif_opaque_softc *hif_ctx,
 	napi_info = (struct qca_napi_info *)
 		container_of(napi, struct qca_napi_info, napi);
 
+	NAPI_DEBUG("%s -->(napi(%d, irq=%d), budget=%d)",
+		   __func__, napi_info->id, napi_info->irq, budget);
+
 	napi_info->stats[cpu].napi_polls++;
 
 	hif_record_ce_desc_event(hif, NAPI_ID2PIPE(napi_info->id),
@@ -838,13 +887,16 @@ void hif_napi_update_yield_stats(struct CE_state *ce_state,
 		return;
 	}
 
+	if (unlikely(NULL == napi_data->napis[ce_id]))
+		return;
+
 	ce_id = ce_state->id;
 	cpu_id = qdf_get_cpu();
 
 	if (time_limit_reached)
-		napi_data->napis[ce_id].stats[cpu_id].time_limit_reached++;
+		napi_data->napis[ce_id]->stats[cpu_id].time_limit_reached++;
 	else
-		napi_data->napis[ce_id].stats[cpu_id].rxpkt_thresh_reached++;
+		napi_data->napis[ce_id]->stats[cpu_id].rxpkt_thresh_reached++;
 }
 
 /**
@@ -1252,15 +1304,17 @@ static int hncm_migrate_to(struct qca_napi_data *napid,
 	NAPI_DEBUG("-->%s(napi_cd=%d, didx=%d)", __func__, napi_ce, didx);
 
 	cpumask.bits[0] = (1 << didx);
+	if (!napid->napis[napi_ce])
+		return -EINVAL;
 
-	irq_modify_status(napid->napis[napi_ce].irq, IRQ_NO_BALANCING, 0);
-	rc = irq_set_affinity_hint(napid->napis[napi_ce].irq, &cpumask);
+	irq_modify_status(napid->napis[napi_ce]->irq, IRQ_NO_BALANCING, 0);
+	rc = irq_set_affinity_hint(napid->napis[napi_ce]->irq, &cpumask);
 
 	/* unmark the napis bitmap in the cpu table */
-	napid->napi_cpu[napid->napis[napi_ce].cpu].napis &= ~(0x01 << napi_ce);
+	napid->napi_cpu[napid->napis[napi_ce]->cpu].napis &= ~(0x01 << napi_ce);
 	/* mark the napis bitmap for the new designated cpu */
 	napid->napi_cpu[didx].napis |= (0x01 << napi_ce);
-	napid->napis[napi_ce].cpu = didx;
+	napid->napis[napi_ce]->cpu = didx;
 
 	NAPI_DEBUG("<--%s[%d]", __func__, rc);
 	return rc;
@@ -1424,17 +1478,23 @@ hncm_return:
 static inline void hif_napi_bl_irq(struct qca_napi_data *napid, bool bl_flag)
 {
 	int i;
+	struct qca_napi_info *napii;
 
 	for (i = 0; i < CE_COUNT_MAX; i++) {
 		/* check if NAPI is enabled on the CE */
 		if (!(napid->ce_map & (0x01 << i)))
 			continue;
 
+		/*double check that NAPI is allocated for the CE */
+		napii = napid->napis[i];
+		if (!(napii))
+			continue;
+
 		if (bl_flag == true)
-			irq_modify_status(napid->napis[i].irq,
+			irq_modify_status(napii->irq,
 					  0, IRQ_NO_BALANCING);
 		else
-			irq_modify_status(napid->napis[i].irq,
+			irq_modify_status(napii->irq,
 					  IRQ_NO_BALANCING, 0);
 		HIF_DBG("%s: bl_flag %d CE %d", __func__, bl_flag, i);
 	}