net/dpaa2: add support for tail drop on queue

[dpdk.git] / drivers / net / dpaa2 / mc / fsl_dpni.h

diff --git a/drivers/net/dpaa2/mc/fsl_dpni.h b/drivers/net/dpaa2/mc/fsl_dpni.h
index 2b6515a..8783af6 100644 (file)
--- a/drivers/net/dpaa2/mc/fsl_dpni.h
+++ b/drivers/net/dpaa2/mc/fsl_dpni.h
@@ -1336,4 +1336,89 @@ int dpni_reset_statistics(struct fsl_mc_io *mc_io,
                          uint32_t cmd_flags,
                          uint16_t token);
 
+/**
+ * enum dpni_congestion_point - Structure representing congestion point
+ * @DPNI_CP_QUEUE:     Set taildrop per queue, identified by QUEUE_TYPE, TC and
+ *                             QUEUE_INDEX
+ * @DPNI_CP_GROUP:     Set taildrop per queue group. Depending on options used
+ *                             to define the DPNI this can be either per
+ *                             TC (default) or per interface
+ *                             (DPNI_OPT_SHARED_CONGESTION set at DPNI create).
+ *                             QUEUE_INDEX is ignored if this type is used.
+ */
+enum dpni_congestion_point {
+       DPNI_CP_QUEUE,
+       DPNI_CP_GROUP,
+};
+
+/**
+ * struct dpni_taildrop - Structure representing the taildrop
+ * @enable:    Indicates whether the taildrop is active or not.
+ * @units:     Indicates the unit of THRESHOLD. Queue taildrop only
+ *                     supports byte units, this field is ignored and
+ *                     assumed = 0 if CONGESTION_POINT is 0.
+ * @threshold: Threshold value, in units identified by UNITS field. Value 0
+ *                     cannot be used as a valid taildrop threshold,
+ *                     THRESHOLD must be > 0 if the taildrop is
+ *                     enabled.
+ */
+struct dpni_taildrop {
+       char enable;
+       enum dpni_congestion_unit units;
+       uint32_t threshold;
+};
+
+/**
+ * dpni_set_taildrop() - Set taildrop per queue or TC
+ *
+ * Setting a per-TC taildrop (cg_point = DPNI_CP_GROUP) will reset any current
+ * congestion notification or early drop (WRED) configuration previously applied
+ * to the same TC.
+ *
+ * @mc_io:     Pointer to MC portal's I/O object
+ * @cmd_flags: Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:     Token of DPNI object
+ * @cg_point:  Congestion point.  DPNI_CP_QUEUE is only supported in
+ *             combination with DPNI_QUEUE_RX.
+ * @q_type:    Queue type, can be DPNI_QUEUE_RX or DPNI_QUEUE_TX.
+ * @tc:                Traffic class to apply this taildrop to
+ * @q_index:   Index of the queue if the DPNI supports multiple queues for
+ *                     traffic distribution.
+ *                     Ignored if CONGESTION_POINT is not DPNI_CP_QUEUE.
+ * @taildrop:  Taildrop structure
+ *
+ * Return:  '0' on Success; Error code otherwise.
+ */
+int dpni_set_taildrop(struct fsl_mc_io *mc_io,
+                     uint32_t cmd_flags,
+                     uint16_t token,
+                     enum dpni_congestion_point cg_point,
+                     enum dpni_queue_type q_type,
+                     uint8_t tc,
+                     uint8_t q_index,
+                     struct dpni_taildrop *taildrop);
+
+/**
+ * dpni_get_taildrop() - Get taildrop information
+ * @mc_io:     Pointer to MC portal's I/O object
+ * @cmd_flags: Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:     Token of DPNI object
+ * @cg_point:  Congestion point
+ * @q_type:
+ * @tc:                Traffic class to apply this taildrop to
+ * @q_index:   Index of the queue if the DPNI supports multiple queues for
+ *                     traffic distribution. Ignored if CONGESTION_POINT
+ *                     is not 0.
+ * @taildrop:  Taildrop structure
+ *
+ * Return:  '0' on Success; Error code otherwise.
+ */
+int dpni_get_taildrop(struct fsl_mc_io *mc_io,
+                     uint32_t cmd_flags,
+                     uint16_t token,
+                     enum dpni_congestion_point cg_point,
+                     enum dpni_queue_type q_type,
+                     uint8_t tc,
+                     uint8_t q_index,
+                     struct dpni_taildrop *taildrop);
 #endif /* __FSL_DPNI_H */