qed: introduce qed_chain_get_elem_used{,u32}()

Add reverse-variants of qed_chain_get_elem_left{,u32}() to be able to
know current chain occupation. They will be used in the upcoming qede
XDP_REDIRECT code.
They share most of the logics with the mentioned ones, so were reused
to collapse the latters.

Signed-off-by: Alexander Lobakin <alobakin@marvell.com>
Signed-off-by: Igor Russkikh <irusskikh@marvell.com>
Signed-off-by: Michal Kalderon <michal.kalderon@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/qed/qed_chain.h b/include/linux/qed/qed_chain.h
index 434479e..4d58dc8 100644 (file)
--- a/include/linux/qed/qed_chain.h
+++ b/include/linux/qed/qed_chain.h
@@ -203,7 +203,7 @@ static inline u32 qed_chain_get_cons_idx_u32(const struct qed_chain *chain)
        return chain->u.chain32.cons_idx;
 }
 
-static inline u16 qed_chain_get_elem_left(const struct qed_chain *chain)
+static inline u16 qed_chain_get_elem_used(const struct qed_chain *chain)
 {
        u32 prod = qed_chain_get_prod_idx(chain);
        u32 cons = qed_chain_get_cons_idx(chain);
@@ -217,10 +217,15 @@ static inline u16 qed_chain_get_elem_left(const struct qed_chain *chain)
        if (chain->mode == QED_CHAIN_MODE_NEXT_PTR)
                used -= (u16)(prod / elem_per_page - cons / elem_per_page);
 
-       return (u16)(chain->capacity - used);
+       return used;
 }
 
-static inline u32 qed_chain_get_elem_left_u32(const struct qed_chain *chain)
+static inline u16 qed_chain_get_elem_left(const struct qed_chain *chain)
+{
+       return (u16)(chain->capacity - qed_chain_get_elem_used(chain));
+}
+
+static inline u32 qed_chain_get_elem_used_u32(const struct qed_chain *chain)
 {
        u64 prod = qed_chain_get_prod_idx_u32(chain);
        u64 cons = qed_chain_get_cons_idx_u32(chain);
@@ -234,7 +239,12 @@ static inline u32 qed_chain_get_elem_left_u32(const struct qed_chain *chain)
        if (chain->mode == QED_CHAIN_MODE_NEXT_PTR)
                used -= (u32)(prod / elem_per_page - cons / elem_per_page);
 
-       return chain->capacity - used;
+       return used;
+}
+
+static inline u32 qed_chain_get_elem_left_u32(const struct qed_chain *chain)
+{
+       return chain->capacity - qed_chain_get_elem_used_u32(chain);
 }
 
 static inline u16 qed_chain_get_usable_per_page(const struct qed_chain *chain)