[dpdk-dev] [PATCH v2 06/14] net/qede/base: add new chain API

[Rasesh Mody <rasesh.mody@cavium.com>]

Add new API ecore_chain_set_cons() and fix page index setting in
ecore_chain_set_prod(). The new API is for future use.

Signed-off-by: Rasesh Mody <rasesh.mody@cavium.com>
---
 drivers/net/qede/base/ecore_chain.h |   49 ++++++++++++++++++++++++++++++++++-
 1 file changed, 48 insertions(+), 1 deletion(-)

diff --git a/drivers/net/qede/base/ecore_chain.h b/drivers/net/qede/base/ecore_chain.h
index d8f69ad..f8c932b 100644
--- a/drivers/net/qede/base/ecore_chain.h
+++ b/drivers/net/qede/base/ecore_chain.h
@@ -526,7 +526,7 @@ static OSAL_INLINE void ecore_chain_reset(struct ecore_chain *p_chain)
 	p_chain->p_prod_elem = p_chain->p_virt_addr;
 
 	if (p_chain->mode == ECORE_CHAIN_MODE_PBL) {
-		/* Use (page_cnt - 1) as a reset value for the prod/cons page's
+		/* Use "page_cnt-1" as a reset value for the prod/cons page's
 		 * indices, to avoid unnecessary page advancing on the first
 		 * call to ecore_chain_produce/consume. Instead, the indices
 		 * will be advanced to page_cnt and then will be wrapped to 0.
@@ -726,6 +726,21 @@ static OSAL_INLINE void *ecore_chain_get_last_elem(struct ecore_chain *p_chain)
 static OSAL_INLINE void ecore_chain_set_prod(struct ecore_chain *p_chain,
 					     u32 prod_idx, void *p_prod_elem)
 {
+	if (p_chain->mode == ECORE_CHAIN_MODE_PBL) {
+		/* Use "prod_idx-1" since ecore_chain_produce() advances the
+		 * page index before the producer index when getting to
+		 * "next_page_mask".
+		 */
+		u32 elem_idx =
+			(prod_idx - 1 + p_chain->capacity) % p_chain->capacity;
+		u32 page_idx = elem_idx / p_chain->elem_per_page;
+
+		if (is_chain_u16(p_chain))
+			p_chain->pbl.c.u16.prod_page_idx = (u16)page_idx;
+		else
+			p_chain->pbl.c.u32.prod_page_idx = page_idx;
+	}
+
 	if (is_chain_u16(p_chain))
 		p_chain->u.chain16.prod_idx = (u16)prod_idx;
 	else
@@ -734,6 +749,38 @@ static OSAL_INLINE void ecore_chain_set_prod(struct ecore_chain *p_chain,
 }
 
 /**
+ * @brief ecore_chain_set_cons - sets the cons to the given value
+ *
+ * @param cons_idx
+ * @param p_cons_elem
+ */
+static OSAL_INLINE void ecore_chain_set_cons(struct ecore_chain *p_chain,
+					     u32 cons_idx, void *p_cons_elem)
+{
+	if (p_chain->mode == ECORE_CHAIN_MODE_PBL) {
+		/* Use "cons_idx-1" since ecore_chain_consume() advances the
+		 * page index before the consumer index when getting to
+		 * "next_page_mask".
+		 */
+		u32 elem_idx =
+			(cons_idx - 1 + p_chain->capacity) % p_chain->capacity;
+		u32 page_idx = elem_idx / p_chain->elem_per_page;
+
+		if (is_chain_u16(p_chain))
+			p_chain->pbl.c.u16.cons_page_idx = (u16)page_idx;
+		else
+			p_chain->pbl.c.u32.cons_page_idx = page_idx;
+	}
+
+	if (is_chain_u16(p_chain))
+		p_chain->u.chain16.cons_idx = (u16)cons_idx;
+	else
+		p_chain->u.chain32.cons_idx = cons_idx;
+
+	p_chain->p_cons_elem = p_cons_elem;
+}
+
+/**
  * @brief ecore_chain_pbl_zero_mem - set chain memory to 0
  *
  * @param p_chain
-- 
1.7.10.3