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.

Alexander Lobakin committed 6 years ago

Commit be0cec61 parent f2aefd21 file · +14 −4Browse files

Showing the changes to include/linux (1 of 1 file). Show all

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include/linux/qed/qed_chain.h+14−4

 	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);
 	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);
 	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)