[PATCH 2/3] soc: fsl: dpio: QMAN performance improvement. Function pointer indirection.

[Youri Querry <youri.querry_1@nxp.com>]

We are making the access decision in the initialization and
setting the function pointers accordingly.

Signed-off-by: Youri Querry <youri.querry_1@nxp.com>
---
 drivers/soc/fsl/dpio/qbman-portal.c | 451 +++++++++++++++++++++++++++++++-----
 drivers/soc/fsl/dpio/qbman-portal.h | 129 ++++++++++-
 2 files changed, 507 insertions(+), 73 deletions(-)

diff --git a/drivers/soc/fsl/dpio/qbman-portal.c b/drivers/soc/fsl/dpio/qbman-portal.c
index 5a37ac8..0ffe018 100644
--- a/drivers/soc/fsl/dpio/qbman-portal.c
+++ b/drivers/soc/fsl/dpio/qbman-portal.c
@@ -83,6 +83,82 @@ enum qbman_sdqcr_fc {
 	qbman_sdqcr_fc_up_to_3 = 1
 };
 
+/* Internal Function declaration */
+static int qbman_swp_enqueue_direct(struct qbman_swp *s,
+				    const struct qbman_eq_desc *d,
+				    const struct dpaa2_fd *fd);
+static int qbman_swp_enqueue_mem_back(struct qbman_swp *s,
+				      const struct qbman_eq_desc *d,
+				      const struct dpaa2_fd *fd);
+static int qbman_swp_enqueue_multiple_direct(struct qbman_swp *s,
+					     const struct qbman_eq_desc *d,
+					     const struct dpaa2_fd *fd,
+					     uint32_t *flags,
+					     int num_frames);
+static int qbman_swp_enqueue_multiple_mem_back(struct qbman_swp *s,
+					       const struct qbman_eq_desc *d,
+					       const struct dpaa2_fd *fd,
+					       uint32_t *flags,
+					       int num_frames);
+static int
+qbman_swp_enqueue_multiple_desc_direct(struct qbman_swp *s,
+				       const struct qbman_eq_desc *d,
+				       const struct dpaa2_fd *fd,
+				       int num_frames);
+static
+int qbman_swp_enqueue_multiple_desc_mem_back(struct qbman_swp *s,
+					     const struct qbman_eq_desc *d,
+					     const struct dpaa2_fd *fd,
+					     int num_frames);
+static int qbman_swp_pull_direct(struct qbman_swp *s,
+				 struct qbman_pull_desc *d);
+static int qbman_swp_pull_mem_back(struct qbman_swp *s,
+				   struct qbman_pull_desc *d);
+
+const struct dpaa2_dq *qbman_swp_dqrr_next_direct(struct qbman_swp *s);
+const struct dpaa2_dq *qbman_swp_dqrr_next_mem_back(struct qbman_swp *s);
+
+static int qbman_swp_release_direct(struct qbman_swp *s,
+				    const struct qbman_release_desc *d,
+				    const u64 *buffers,
+				    unsigned int num_buffers);
+static int qbman_swp_release_mem_back(struct qbman_swp *s,
+				      const struct qbman_release_desc *d,
+				      const u64 *buffers,
+				      unsigned int num_buffers);
+
+/* Function pointers */
+int (*qbman_swp_enqueue_ptr)(struct qbman_swp *s,
+			     const struct qbman_eq_desc *d,
+			     const struct dpaa2_fd *fd)
+	= qbman_swp_enqueue_direct;
+
+int (*qbman_swp_enqueue_multiple_ptr)(struct qbman_swp *s,
+				      const struct qbman_eq_desc *d,
+				      const struct dpaa2_fd *fd,
+				      uint32_t *flags,
+					     int num_frames)
+	= qbman_swp_enqueue_multiple_direct;
+
+int
+(*qbman_swp_enqueue_multiple_desc_ptr)(struct qbman_swp *s,
+				       const struct qbman_eq_desc *d,
+				       const struct dpaa2_fd *fd,
+				       int num_frames)
+	= qbman_swp_enqueue_multiple_desc_direct;
+
+int (*qbman_swp_pull_ptr)(struct qbman_swp *s, struct qbman_pull_desc *d)
+			= qbman_swp_pull_direct;
+
+const struct dpaa2_dq *(*qbman_swp_dqrr_next_ptr)(struct qbman_swp *s)
+			= qbman_swp_dqrr_next_direct;
+
+int (*qbman_swp_release_ptr)(struct qbman_swp *s,
+			     const struct qbman_release_desc *d,
+			     const u64 *buffers,
+			     unsigned int num_buffers)
+			= qbman_swp_release_direct;
+
 /* Portal Access */
 
 static inline u32 qbman_read_register(struct qbman_swp *p, u32 offset)
@@ -218,6 +294,19 @@ struct qbman_swp *qbman_swp_init(const struct qbman_swp_desc *d)
 	 * applied when dequeues from a specific channel are enabled.
 	 */
 	qbman_write_register(p, QBMAN_CINH_SWP_SDQCR, 0);
+
+	if ((p->desc->qman_version & QMAN_REV_MASK) >= QMAN_REV_5000) {
+		qbman_swp_enqueue_ptr =
+			qbman_swp_enqueue_mem_back;
+		qbman_swp_enqueue_multiple_ptr =
+			qbman_swp_enqueue_multiple_mem_back;
+		qbman_swp_enqueue_multiple_desc_ptr =
+			qbman_swp_enqueue_multiple_desc_mem_back;
+		qbman_swp_pull_ptr = qbman_swp_pull_mem_back;
+		qbman_swp_dqrr_next_ptr = qbman_swp_dqrr_next_mem_back;
+		qbman_swp_release_ptr = qbman_swp_release_mem_back;
+	}
+
 	return p;
 }
 
@@ -447,7 +536,7 @@ static inline void qbman_write_eqcr_am_rt_register(struct qbman_swp *p,
 }
 
 /**
- * qbman_swp_enqueue() - Issue an enqueue command
+ * qbman_swp_enqueue_direct() - Issue an enqueue command
  * @s:  the software portal used for enqueue
  * @d:  the enqueue descriptor
  * @fd: the frame descriptor to be enqueued
@@ -457,7 +546,7 @@ static inline void qbman_write_eqcr_am_rt_register(struct qbman_swp *p,
  *
  * Return 0 for successful enqueue, -EBUSY if the EQCR is not ready.
  */
-int qbman_swp_enqueue(struct qbman_swp *s, const struct qbman_eq_desc *d,
+int qbman_swp_enqueue_direct(struct qbman_swp *s, const struct qbman_eq_desc *d,
 		      const struct dpaa2_fd *fd)
 {
 	struct qbman_eq_desc_with_fd *p;
@@ -480,21 +569,57 @@ int qbman_swp_enqueue(struct qbman_swp *s, const struct qbman_eq_desc *d,
 	memcpy(&p->desc.tgtid, &d->tgtid, 24);
 	memcpy(&p->fd, fd, sizeof(*fd));
 
-	if ((s->desc->qman_version & QMAN_REV_MASK) < QMAN_REV_5000) {
-		/* Set the verb byte, have to substitute in the valid-bit */
-		dma_wmb();
-		p->desc.verb = d->verb | EQAR_VB(eqar);
-	} else {
-		p->desc.verb = d->verb | EQAR_VB(eqar);
-		dma_wmb();
-		qbman_write_eqcr_am_rt_register(s, EQAR_IDX(eqar));
-	}
+	/* Set the verb byte, have to substitute in the valid-bit */
+	dma_wmb();
+	p->desc.verb = d->verb | EQAR_VB(eqar);
 
 	return 0;
 }
 
 /**
- * qbman_swp_enqueue_multiple() - Issue a multi enqueue command
+ * qbman_swp_enqueue_mem_back() - Issue an enqueue command
+ * @s:  the software portal used for enqueue
+ * @d:  the enqueue descriptor
+ * @fd: the frame descriptor to be enqueued
+ *
+ * Please note that 'fd' should only be NULL if the "action" of the
+ * descriptor is "orp_hole" or "orp_nesn".
+ *
+ * Return 0 for successful enqueue, -EBUSY if the EQCR is not ready.
+ */
+int qbman_swp_enqueue_mem_back(struct qbman_swp *s,
+			       const struct qbman_eq_desc *d,
+			       const struct dpaa2_fd *fd)
+{
+	struct qbman_eq_desc_with_fd *p;
+	u32 eqar = qbman_read_register(s, QBMAN_CINH_SWP_EQAR);
+
+	if (!EQAR_SUCCESS(eqar))
+		return -EBUSY;
+
+	p = qbman_get_cmd(s, QBMAN_CENA_SWP_EQCR(EQAR_IDX(eqar)));
+	/* This is mapped as DEVICE type memory, writes are
+	 * with address alignment:
+	 * desc.dca address alignment = 1
+	 * desc.seqnum address alignment = 2
+	 * desc.orpid address alignment = 4
+	 * desc.tgtid address alignment = 8
+	 */
+	p->desc.dca = d->dca;
+	p->desc.seqnum = d->seqnum;
+	p->desc.orpid = d->orpid;
+	memcpy(&p->desc.tgtid, &d->tgtid, 24);
+	memcpy(&p->fd, fd, sizeof(*fd));
+
+	p->desc.verb = d->verb | EQAR_VB(eqar);
+	dma_wmb();
+	qbman_write_eqcr_am_rt_register(s, EQAR_IDX(eqar));
+
+	return 0;
+}
+
+/**
+ * qbman_swp_enqueue_multiple_direct() - Issue a multi enqueue command
  * using one enqueue descriptor
  * @s:  the software portal used for enqueue
  * @d:  the enqueue descriptor
@@ -504,16 +629,44 @@ int qbman_swp_enqueue(struct qbman_swp *s, const struct qbman_eq_desc *d,
  *
  * Return the number of fd enqueued, or a negative error number.
  */
-int qbman_swp_enqueue_multiple(struct qbman_swp *s,
-			       const struct qbman_eq_desc *d,
-			       const struct dpaa2_fd *fd,
-			       uint32_t *flags,
-			       int num_frames)
+int qbman_swp_enqueue_multiple_direct(struct qbman_swp *s,
+				      const struct qbman_eq_desc *d,
+				      const struct dpaa2_fd *fd,
+				      uint32_t *flags,
+				      int num_frames)
+{
+	int count = 0;
+
+	while (count < num_frames) {
+		if (qbman_swp_enqueue_direct(s, d, fd) != 0)
+			break;
+		count++;
+	}
+
+	return count;
+}
+
+/**
+ * qbman_swp_enqueue_multiple_mem_back() - Issue a multi enqueue command
+ * using one enqueue descriptor
+ * @s:  the software portal used for enqueue
+ * @d:  the enqueue descriptor
+ * @fd: table pointer of frame descriptor table to be enqueued
+ * @flags: table pointer of flags, not used for the moment
+ * @num_frames: number of fd to be enqueued
+ *
+ * Return the number of fd enqueued, or a negative error number.
+ */
+int qbman_swp_enqueue_multiple_mem_back(struct qbman_swp *s,
+				      const struct qbman_eq_desc *d,
+				      const struct dpaa2_fd *fd,
+				      uint32_t *flags,
+				      int num_frames)
 {
 	int count = 0;
 
 	while (count < num_frames) {
-		if (qbman_swp_enqueue(s, d, fd) != 0)
+		if (qbman_swp_enqueue_mem_back(s, d, fd) != 0)
 			break;
 		count++;
 	}
@@ -522,7 +675,7 @@ int qbman_swp_enqueue_multiple(struct qbman_swp *s,
 }
 
 /**
- * qbman_swp_enqueue_multiple_desc() - Issue a multi enqueue command
+ * qbman_swp_enqueue_multiple_desc_direct() - Issue a multi enqueue command
  * using multiple enqueue descriptor
  * @s:  the software portal used for enqueue
  * @d:  table of minimal enqueue descriptor
@@ -531,15 +684,41 @@ int qbman_swp_enqueue_multiple(struct qbman_swp *s,
  *
  * Return the number of fd enqueued, or a negative error number.
  */
-int qbman_swp_enqueue_multiple_desc(struct qbman_swp *s,
-				    const struct qbman_eq_desc *d,
-				    const struct dpaa2_fd *fd,
-				    int num_frames)
+int qbman_swp_enqueue_multiple_desc_direct(struct qbman_swp *s,
+					   const struct qbman_eq_desc *d,
+					   const struct dpaa2_fd *fd,
+					   int num_frames)
+{
+	int count = 0;
+
+	while (count < num_frames) {
+		if (qbman_swp_enqueue_direct(s, &(d[count]), fd) != 0)
+			break;
+		count++;
+	}
+
+	return count;
+}
+
+/**
+ * qbman_swp_enqueue_multiple_desc_mem_back() - Issue a multi enqueue command
+ * using multiple enqueue descriptor
+ * @s:  the software portal used for enqueue
+ * @d:  table of minimal enqueue descriptor
+ * @fd: table pointer of frame descriptor table to be enqueued
+ * @num_frames: number of fd to be enqueued
+ *
+ * Return the number of fd enqueued, or a negative error number.
+ */
+int qbman_swp_enqueue_multiple_desc_mem_back(struct qbman_swp *s,
+					   const struct qbman_eq_desc *d,
+					   const struct dpaa2_fd *fd,
+					   int num_frames)
 {
 	int count = 0;
 
 	while (count < num_frames) {
-		if (qbman_swp_enqueue(s, &(d[count]), fd) != 0)
+		if (qbman_swp_enqueue_mem_back(s, &(d[count]), fd) != 0)
 			break;
 		count++;
 	}
@@ -702,7 +881,7 @@ void qbman_pull_desc_set_channel(struct qbman_pull_desc *d, u32 chid,
 }
 
 /**
- * qbman_swp_pull() - Issue the pull dequeue command
+ * qbman_swp_pull_direct() - Issue the pull dequeue command
  * @s: the software portal object
  * @d: the software portal descriptor which has been configured with
  *     the set of qbman_pull_desc_set_*() calls
@@ -710,7 +889,7 @@ void qbman_pull_desc_set_channel(struct qbman_pull_desc *d, u32 chid,
  * Return 0 for success, and -EBUSY if the software portal is not ready
  * to do pull dequeue.
  */
-int qbman_swp_pull(struct qbman_swp *s, struct qbman_pull_desc *d)
+int qbman_swp_pull_direct(struct qbman_swp *s, struct qbman_pull_desc *d)
 {
 	struct qbman_pull_desc *p;
 
@@ -728,18 +907,45 @@ int qbman_swp_pull(struct qbman_swp *s, struct qbman_pull_desc *d)
 	p->dq_src = d->dq_src;
 	p->rsp_addr = d->rsp_addr;
 	p->rsp_addr_virt = d->rsp_addr_virt;
+	dma_wmb();
+	/* Set the verb byte, have to substitute in the valid-bit */
+	p->verb = d->verb | s->vdq.valid_bit;
+	s->vdq.valid_bit ^= QB_VALID_BIT;
 
-	if ((s->desc->qman_version & QMAN_REV_MASK) < QMAN_REV_5000) {
-		dma_wmb();
-		/* Set the verb byte, have to substitute in the valid-bit */
-		p->verb = d->verb | s->vdq.valid_bit;
-		s->vdq.valid_bit ^= QB_VALID_BIT;
-	} else {
-		p->verb = d->verb | s->vdq.valid_bit;
-		s->vdq.valid_bit ^= QB_VALID_BIT;
-		dma_wmb();
-		qbman_write_register(s, QBMAN_CINH_SWP_VDQCR_RT, QMAN_RT_MODE);
+	return 0;
+}
+
+/**
+ * qbman_swp_pull_mem_back() - Issue the pull dequeue command
+ * @s: the software portal object
+ * @d: the software portal descriptor which has been configured with
+ *     the set of qbman_pull_desc_set_*() calls
+ *
+ * Return 0 for success, and -EBUSY if the software portal is not ready
+ * to do pull dequeue.
+ */
+int qbman_swp_pull_mem_back(struct qbman_swp *s, struct qbman_pull_desc *d)
+{
+	struct qbman_pull_desc *p;
+
+	if (!atomic_dec_and_test(&s->vdq.available)) {
+		atomic_inc(&s->vdq.available);
+		return -EBUSY;
 	}
+	s->vdq.storage = (void *)(uintptr_t)d->rsp_addr_virt;
+	if ((s->desc->qman_version & QMAN_REV_MASK) < QMAN_REV_5000)
+		p = qbman_get_cmd(s, QBMAN_CENA_SWP_VDQCR);
+	else
+		p = qbman_get_cmd(s, QBMAN_CENA_SWP_VDQCR_MEM);
+	p->numf = d->numf;
+	p->tok = QMAN_DQ_TOKEN_VALID;
+	p->dq_src = d->dq_src;
+	p->rsp_addr = d->rsp_addr;
+	p->rsp_addr_virt = d->rsp_addr_virt;
+	p->verb = d->verb | s->vdq.valid_bit;
+	s->vdq.valid_bit ^= QB_VALID_BIT;
+	dma_wmb();
+	qbman_write_register(s, QBMAN_CINH_SWP_VDQCR_RT, QMAN_RT_MODE);
 
 	return 0;
 }
@@ -747,14 +953,14 @@ int qbman_swp_pull(struct qbman_swp *s, struct qbman_pull_desc *d)
 #define QMAN_DQRR_PI_MASK   0xf
 
 /**
- * qbman_swp_dqrr_next() - Get an valid DQRR entry
+ * qbman_swp_dqrr_next_direct() - Get an valid DQRR entry
  * @s: the software portal object
  *
  * Return NULL if there are no unconsumed DQRR entries. Return a DQRR entry
  * only once, so repeated calls can return a sequence of DQRR entries, without
  * requiring they be consumed immediately or in any particular order.
  */
-const struct dpaa2_dq *qbman_swp_dqrr_next(struct qbman_swp *s)
+const struct dpaa2_dq *qbman_swp_dqrr_next_direct(struct qbman_swp *s)
 {
 	u32 verb;
 	u32 response_verb;
@@ -797,10 +1003,99 @@ const struct dpaa2_dq *qbman_swp_dqrr_next(struct qbman_swp *s)
 				       QBMAN_CENA_SWP_DQRR(s->dqrr.next_idx)));
 	}
 
-	if ((s->desc->qman_version & QMAN_REV_MASK) < QMAN_REV_5000)
-		p = qbman_get_cmd(s, QBMAN_CENA_SWP_DQRR(s->dqrr.next_idx));
-	else
-		p = qbman_get_cmd(s, QBMAN_CENA_SWP_DQRR_MEM(s->dqrr.next_idx));
+	p = qbman_get_cmd(s, QBMAN_CENA_SWP_DQRR(s->dqrr.next_idx));
+	verb = p->dq.verb;
+
+	/*
+	 * If the valid-bit isn't of the expected polarity, nothing there. Note,
+	 * in the DQRR reset bug workaround, we shouldn't need to skip these
+	 * check, because we've already determined that a new entry is available
+	 * and we've invalidated the cacheline before reading it, so the
+	 * valid-bit behaviour is repaired and should tell us what we already
+	 * knew from reading PI.
+	 */
+	if ((verb & QB_VALID_BIT) != s->dqrr.valid_bit) {
+		prefetch(qbman_get_cmd(s,
+				       QBMAN_CENA_SWP_DQRR(s->dqrr.next_idx)));
+		return NULL;
+	}
+	/*
+	 * There's something there. Move "next_idx" attention to the next ring
+	 * entry (and prefetch it) before returning what we found.
+	 */
+	s->dqrr.next_idx++;
+	s->dqrr.next_idx &= s->dqrr.dqrr_size - 1; /* Wrap around */
+	if (!s->dqrr.next_idx)
+		s->dqrr.valid_bit ^= QB_VALID_BIT;
+
+	/*
+	 * If this is the final response to a volatile dequeue command
+	 * indicate that the vdq is available
+	 */
+	flags = p->dq.stat;
+	response_verb = verb & QBMAN_RESULT_MASK;
+	if ((response_verb == QBMAN_RESULT_DQ) &&
+	    (flags & DPAA2_DQ_STAT_VOLATILE) &&
+	    (flags & DPAA2_DQ_STAT_EXPIRED))
+		atomic_inc(&s->vdq.available);
+
+	prefetch(qbman_get_cmd(s, QBMAN_CENA_SWP_DQRR(s->dqrr.next_idx)));
+
+	return p;
+}
+
+/**
+ * qbman_swp_dqrr_next_mem_back() - Get an valid DQRR entry
+ * @s: the software portal object
+ *
+ * Return NULL if there are no unconsumed DQRR entries. Return a DQRR entry
+ * only once, so repeated calls can return a sequence of DQRR entries, without
+ * requiring they be consumed immediately or in any particular order.
+ */
+const struct dpaa2_dq *qbman_swp_dqrr_next_mem_back(struct qbman_swp *s)
+{
+	u32 verb;
+	u32 response_verb;
+	u32 flags;
+	struct dpaa2_dq *p;
+
+	/* Before using valid-bit to detect if something is there, we have to
+	 * handle the case of the DQRR reset bug...
+	 */
+	if (unlikely(s->dqrr.reset_bug)) {
+		/*
+		 * We pick up new entries by cache-inhibited producer index,
+		 * which means that a non-coherent mapping would require us to
+		 * invalidate and read *only* once that PI has indicated that
+		 * there's an entry here. The first trip around the DQRR ring
+		 * will be much less efficient than all subsequent trips around
+		 * it...
+		 */
+		u8 pi = qbman_read_register(s, QBMAN_CINH_SWP_DQPI) &
+			QMAN_DQRR_PI_MASK;
+
+		/* there are new entries if pi != next_idx */
+		if (pi == s->dqrr.next_idx)
+			return NULL;
+
+		/*
+		 * if next_idx is/was the last ring index, and 'pi' is
+		 * different, we can disable the workaround as all the ring
+		 * entries have now been DMA'd to so valid-bit checking is
+		 * repaired. Note: this logic needs to be based on next_idx
+		 * (which increments one at a time), rather than on pi (which
+		 * can burst and wrap-around between our snapshots of it).
+		 */
+		if (s->dqrr.next_idx == (s->dqrr.dqrr_size - 1)) {
+			pr_debug("next_idx=%d, pi=%d, clear reset bug\n",
+				 s->dqrr.next_idx, pi);
+			s->dqrr.reset_bug = 0;
+		}
+		prefetch(qbman_get_cmd(s,
+				       QBMAN_CENA_SWP_DQRR(s->dqrr.next_idx)));
+	}
+
+	p = qbman_get_cmd(s, QBMAN_CENA_SWP_DQRR_MEM(s->dqrr.next_idx));
 	verb = p->dq.verb;
 
 	/*
@@ -929,7 +1224,7 @@ void qbman_release_desc_set_rcdi(struct qbman_release_desc *d, int enable)
 #define RAR_SUCCESS(rar) ((rar) & 0x100)
 
 /**
- * qbman_swp_release() - Issue a buffer release command
+ * qbman_swp_release_direct() - Issue a buffer release command
  * @s:           the software portal object
  * @d:           the release descriptor
  * @buffers:     a pointer pointing to the buffer address to be released
@@ -937,8 +1232,9 @@ void qbman_release_desc_set_rcdi(struct qbman_release_desc *d, int enable)
  *
  * Return 0 for success, -EBUSY if the release command ring is not ready.
  */
-int qbman_swp_release(struct qbman_swp *s, const struct qbman_release_desc *d,
-		      const u64 *buffers, unsigned int num_buffers)
+int qbman_swp_release_direct(struct qbman_swp *s,
+			     const struct qbman_release_desc *d,
+			     const u64 *buffers, unsigned int num_buffers)
 {
 	int i;
 	struct qbman_release_desc *p;
@@ -952,28 +1248,59 @@ int qbman_swp_release(struct qbman_swp *s, const struct qbman_release_desc *d,
 		return -EBUSY;
 
 	/* Start the release command */
-	if ((s->desc->qman_version & QMAN_REV_MASK) < QMAN_REV_5000)
-		p = qbman_get_cmd(s, QBMAN_CENA_SWP_RCR(RAR_IDX(rar)));
-	else
-		p = qbman_get_cmd(s, QBMAN_CENA_SWP_RCR_MEM(RAR_IDX(rar)));
+	p = qbman_get_cmd(s, QBMAN_CENA_SWP_RCR(RAR_IDX(rar)));
+
 	/* Copy the caller's buffer pointers to the command */
 	for (i = 0; i < num_buffers; i++)
 		p->buf[i] = cpu_to_le64(buffers[i]);
 	p->bpid = d->bpid;
 
-	if ((s->desc->qman_version & QMAN_REV_MASK) < QMAN_REV_5000) {
-		/*
-		 * Set the verb byte, have to substitute in the valid-bit
-		 * and the number of buffers.
-		 */
-		dma_wmb();
-		p->verb = d->verb | RAR_VB(rar) | num_buffers;
-	} else {
-		p->verb = d->verb | RAR_VB(rar) | num_buffers;
-		dma_wmb();
-		qbman_write_register(s, QBMAN_CINH_SWP_RCR_AM_RT +
-				     RAR_IDX(rar)  * 4, QMAN_RT_MODE);
-	}
+	/*
+	 * Set the verb byte, have to substitute in the valid-bit
+	 * and the number of buffers.
+	 */
+	dma_wmb();
+	p->verb = d->verb | RAR_VB(rar) | num_buffers;
+
+	return 0;
+}
+
+/**
+ * qbman_swp_release_mem_back() - Issue a buffer release command
+ * @s:           the software portal object
+ * @d:           the release descriptor
+ * @buffers:     a pointer pointing to the buffer address to be released
+ * @num_buffers: number of buffers to be released,  must be less than 8
+ *
+ * Return 0 for success, -EBUSY if the release command ring is not ready.
+ */
+int qbman_swp_release_mem_back(struct qbman_swp *s,
+			       const struct qbman_release_desc *d,
+			       const u64 *buffers, unsigned int num_buffers)
+{
+	int i;
+	struct qbman_release_desc *p;
+	u32 rar;
+
+	if (!num_buffers || (num_buffers > 7))
+		return -EINVAL;
+
+	rar = qbman_read_register(s, QBMAN_CINH_SWP_RAR);
+	if (!RAR_SUCCESS(rar))
+		return -EBUSY;
+
+	/* Start the release command */
+	p = qbman_get_cmd(s, QBMAN_CENA_SWP_RCR_MEM(RAR_IDX(rar)));
+
+	/* Copy the caller's buffer pointers to the command */
+	for (i = 0; i < num_buffers; i++)
+		p->buf[i] = cpu_to_le64(buffers[i]);
+	p->bpid = d->bpid;
+
+	p->verb = d->verb | RAR_VB(rar) | num_buffers;
+	dma_wmb();
+	qbman_write_register(s, QBMAN_CINH_SWP_RCR_AM_RT +
+			     RAR_IDX(rar)  * 4, QMAN_RT_MODE);
 
 	return 0;
 }
diff --git a/drivers/soc/fsl/dpio/qbman-portal.h b/drivers/soc/fsl/dpio/qbman-portal.h
index ac58a97..3b3fb86 100644
--- a/drivers/soc/fsl/dpio/qbman-portal.h
+++ b/drivers/soc/fsl/dpio/qbman-portal.h
@@ -145,6 +145,33 @@ struct qbman_swp {
 	} dqrr;
 };
 
+/* Function pointers */
+extern
+int (*qbman_swp_enqueue_ptr)(struct qbman_swp *s,
+			     const struct qbman_eq_desc *d,
+			     const struct dpaa2_fd *fd);
+extern
+int (*qbman_swp_enqueue_multiple_ptr)(struct qbman_swp *s,
+				      const struct qbman_eq_desc *d,
+				      const struct dpaa2_fd *fd,
+				      uint32_t *flags,
+				      int num_frames);
+extern
+int (*qbman_swp_enqueue_multiple_desc_ptr)(struct qbman_swp *s,
+					   const struct qbman_eq_desc *d,
+					   const struct dpaa2_fd *fd,
+					   int num_frames);
+extern
+int (*qbman_swp_pull_ptr)(struct qbman_swp *s, struct qbman_pull_desc *d);
+extern
+const struct dpaa2_dq *(*qbman_swp_dqrr_next_ptr)(struct qbman_swp *s);
+extern
+int (*qbman_swp_release_ptr)(struct qbman_swp *s,
+			     const struct qbman_release_desc *d,
+			     const u64 *buffers,
+			     unsigned int num_buffers);
+
+/* Functions */
 struct qbman_swp *qbman_swp_init(const struct qbman_swp_desc *d);
 void qbman_swp_finish(struct qbman_swp *p);
 u32 qbman_swp_interrupt_read_status(struct qbman_swp *p);
@@ -169,9 +196,6 @@ void qbman_pull_desc_set_wq(struct qbman_pull_desc *d, u32 wqid,
 void qbman_pull_desc_set_channel(struct qbman_pull_desc *d, u32 chid,
 				 enum qbman_pull_type_e dct);
 
-int qbman_swp_pull(struct qbman_swp *p, struct qbman_pull_desc *d);
-
-const struct dpaa2_dq *qbman_swp_dqrr_next(struct qbman_swp *s);
 void qbman_swp_dqrr_consume(struct qbman_swp *s, const struct dpaa2_dq *dq);
 
 int qbman_result_has_new_result(struct qbman_swp *p, const struct dpaa2_dq *dq);
@@ -183,15 +207,11 @@ void qbman_eq_desc_set_fq(struct qbman_eq_desc *d, u32 fqid);
 void qbman_eq_desc_set_qd(struct qbman_eq_desc *d, u32 qdid,
 			  u32 qd_bin, u32 qd_prio);
 
-int qbman_swp_enqueue(struct qbman_swp *p, const struct qbman_eq_desc *d,
-		      const struct dpaa2_fd *fd);
 
 void qbman_release_desc_clear(struct qbman_release_desc *d);
 void qbman_release_desc_set_bpid(struct qbman_release_desc *d, u16 bpid);
 void qbman_release_desc_set_rcdi(struct qbman_release_desc *d, int enable);
 
-int qbman_swp_release(struct qbman_swp *s, const struct qbman_release_desc *d,
-		      const u64 *buffers, unsigned int num_buffers);
 int qbman_swp_acquire(struct qbman_swp *s, u16 bpid, u64 *buffers,
 		      unsigned int num_buffers);
 int qbman_swp_alt_fq_state(struct qbman_swp *s, u32 fqid,
@@ -204,18 +224,60 @@ void *qbman_swp_mc_start(struct qbman_swp *p);
 void qbman_swp_mc_submit(struct qbman_swp *p, void *cmd, u8 cmd_verb);
 void *qbman_swp_mc_result(struct qbman_swp *p);
 
-int
+/**
+ * qbman_swp_enqueue() - Issue an enqueue command
+ * @s:  the software portal used for enqueue
+ * @d:  the enqueue descriptor
+ * @fd: the frame descriptor to be enqueued
+ *
+ * Return 0 for successful enqueue, -EBUSY if the EQCR is not ready.
+ */
+static inline int
+qbman_swp_enqueue(struct qbman_swp *s, const struct qbman_eq_desc *d,
+		  const struct dpaa2_fd *fd)
+{
+	return qbman_swp_enqueue_ptr(s, d, fd);
+}
+
+/**
+ * qbman_swp_enqueue_multiple() - Issue a multi enqueue command
+ * using one enqueue descriptor
+ * @s:  the software portal used for enqueue
+ * @d:  the enqueue descriptor
+ * @fd: table pointer of frame descriptor table to be enqueued
+ * @flags: table pointer of QBMAN_ENQUEUE_FLAG_DCA flags, not used if NULL
+ * @num_frames: number of fd to be enqueued
+ *
+ * Return the number of fd enqueued, or a negative error number.
+ */
+static inline int
 qbman_swp_enqueue_multiple(struct qbman_swp *s,
 			   const struct qbman_eq_desc *d,
 			   const struct dpaa2_fd *fd,
 			   uint32_t *flags,
-			   int num_frames);
+			   int num_frames)
+{
+	return qbman_swp_enqueue_multiple_ptr(s, d, fd, flags, num_frames);
+}
 
-int
+/**
+ * qbman_swp_enqueue_multiple_desc() - Issue a multi enqueue command
+ * using multiple enqueue descriptor
+ * @s:  the software portal used for enqueue
+ * @d:  table of minimal enqueue descriptor
+ * @fd: table pointer of frame descriptor table to be enqueued
+ * @num_frames: number of fd to be enqueued
+ *
+ * Return the number of fd enqueued, or a negative error number.
+ */
+static inline int
 qbman_swp_enqueue_multiple_desc(struct qbman_swp *s,
 				const struct qbman_eq_desc *d,
 				const struct dpaa2_fd *fd,
-				int num_frames);
+				int num_frames)
+{
+	return qbman_swp_enqueue_multiple_desc_ptr(s, d, fd, num_frames);
+}
 
 /**
  * qbman_result_is_DQ() - check if the dequeue result is a dequeue response
@@ -528,4 +590,49 @@ int qbman_bp_query(struct qbman_swp *s, u16 bpid,
 
 u32 qbman_bp_info_num_free_bufs(struct qbman_bp_query_rslt *a);
 
+/**
+ * qbman_swp_release() - Issue a buffer release command
+ * @s:           the software portal object
+ * @d:           the release descriptor
+ * @buffers:     a pointer pointing to the buffer address to be released
+ * @num_buffers: number of buffers to be released,  must be less than 8
+ *
+ * Return 0 for success, -EBUSY if the release command ring is not ready.
+ */
+static inline int qbman_swp_release(struct qbman_swp *s,
+				    const struct qbman_release_desc *d,
+				    const u64 *buffers,
+				    unsigned int num_buffers)
+{
+	return qbman_swp_release_ptr(s, d, buffers, num_buffers);
+}
+
+/**
+ * qbman_swp_pull() - Issue the pull dequeue command
+ * @s: the software portal object
+ * @d: the software portal descriptor which has been configured with
+ *     the set of qbman_pull_desc_set_*() calls
+ *
+ * Return 0 for success, and -EBUSY if the software portal is not ready
+ * to do pull dequeue.
+ */
+static inline int qbman_swp_pull(struct qbman_swp *s,
+				 struct qbman_pull_desc *d)
+{
+	return qbman_swp_pull_ptr(s, d);
+}
+
+/**
+ * qbman_swp_dqrr_next() - Get an valid DQRR entry
+ * @s: the software portal object
+ *
+ * Return NULL if there are no unconsumed DQRR entries. Return a DQRR entry
+ * only once, so repeated calls can return a sequence of DQRR entries, without
+ * requiring they be consumed immediately or in any particular order.
+ */
+static inline const struct dpaa2_dq *qbman_swp_dqrr_next(struct qbman_swp *s)
+{
+	return qbman_swp_dqrr_next_ptr(s);
+}
+
 #endif /* __FSL_QBMAN_PORTAL_H */
-- 
2.7.4


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