qcacld-3.0: Distribute credits amongst groups

1) When a group is created i.e. the first vdev is added to it,
assign all the credits to it.
2) When the second group is created, transfer some minimum credits
to it.
3) When a group is deleted, transfer its credits to the other group.

Change-Id: I0c5532033718b250ab0633b4da4e219c0315cac9
CRs-fixed: 2246206

core/dp/ol/inc/ol_txrx_htt_api.h

@@ -687,4 +687,19 @@ ol_tx_get_max_tx_groups_supported(struct ol_txrx_pdev_t *pdev)
 }
 #endif
 
+#if defined(FEATURE_HL_GROUP_CREDIT_FLOW_CONTROL) && \
+	defined(FEATURE_HL_DBS_GROUP_CREDIT_SHARING)
+int ol_txrx_distribute_group_credits(struct ol_txrx_pdev_t *pdev, u8 group_id,
+				     u32 membership_new);
+#else
+static inline int ol_txrx_distribute_group_credits(struct ol_txrx_pdev_t *pdev,
+						   u8 group_id,
+						   u32 membership_new)
+{
+	return 0;
+}
+#endif /*
+	* FEATURE_HL_GROUP_CREDIT_FLOW_CONTROL &&
+	* FEATURE_HL_DBS_GROUP_CREDIT_SHARING
+	*/
 #endif /* _OL_TXRX_HTT_API__H_ */

core/dp/txrx/ol_txrx.c

@@ -658,11 +658,13 @@ void ol_txrx_update_tx_queue_groups(
 		/* Update Credit Only */
 		goto credit_update;
 
-
+	credit += ol_txrx_distribute_group_credits(pdev, group_id,
+						   vdev_id_mask);
 	/*
 	 * membership (vdev id mask and ac mask) is not matching
 	 * TODO: ignoring ac mask for now
 	 */
+	qdf_assert(ac_mask == 0xffff);
 	group_vdev_id_mask =
 		OL_TXQ_GROUP_VDEV_ID_MASK_GET(group->membership);
 
@@ -698,6 +700,58 @@ credit_update:
 }
 #endif
 
+#if defined(FEATURE_HL_GROUP_CREDIT_FLOW_CONTROL) && \
+	defined(FEATURE_HL_DBS_GROUP_CREDIT_SHARING)
+#define MIN_INIT_GROUP_CREDITS	10
+int ol_txrx_distribute_group_credits(struct ol_txrx_pdev_t *pdev,
+				     u8 group_id,
+				     u32 vdevid_mask_new)
+{
+	struct ol_tx_queue_group_t *grp = &pdev->txq_grps[group_id];
+	struct ol_tx_queue_group_t *grp_nxt = &pdev->txq_grps[!group_id];
+	int creds_nxt = qdf_atomic_read(&grp_nxt->credit);
+	int vdevid_mask = OL_TXQ_GROUP_VDEV_ID_MASK_GET(grp->membership);
+	int vdevid_mask_othgrp =
+		OL_TXQ_GROUP_VDEV_ID_MASK_GET(grp_nxt->membership);
+	int creds_distribute = 0;
+
+	/* if vdev added to the group is the first vdev */
+	if ((vdevid_mask == 0) && (vdevid_mask_new != 0)) {
+		/* if other group has members */
+		if (vdevid_mask_othgrp) {
+			if (creds_nxt < MIN_INIT_GROUP_CREDITS)
+				creds_distribute = creds_nxt / 2;
+			else
+				creds_distribute = MIN_INIT_GROUP_CREDITS;
+
+			ol_txrx_update_group_credit(grp_nxt, -creds_distribute,
+						    0);
+		} else {
+			/*
+			 * Other grp has no members, give all credits to this
+			 * grp.
+			 */
+			creds_distribute =
+				qdf_atomic_read(&pdev->target_tx_credit);
+		}
+	/* if all vdevs are removed from this grp */
+	} else if ((vdevid_mask != 0) && (vdevid_mask_new == 0)) {
+		if (vdevid_mask_othgrp)
+			/* Transfer credits to other grp */
+			ol_txrx_update_group_credit(grp_nxt,
+						    qdf_atomic_read(&grp->
+						    credit),
+						    0);
+		/* Set current grp credits to zero */
+		ol_txrx_update_group_credit(grp, 0, 1);
+	}
+
+	return creds_distribute;
+}
+#endif /*
+	* FEATURE_HL_GROUP_CREDIT_FLOW_CONTROL &&
+	* FEATURE_HL_DBS_GROUP_CREDIT_SHARING
+	*/
 #if defined(CONFIG_HL_SUPPORT) && defined(CONFIG_PER_VDEV_TX_DESC_POOL)
 
 /**