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path: root/drivers/net/wireless/iwlwifi/iwl-helpers.h
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Diffstat (limited to 'drivers/net/wireless/iwlwifi/iwl-helpers.h')
-rw-r--r--drivers/net/wireless/iwlwifi/iwl-helpers.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-helpers.h b/drivers/net/wireless/iwlwifi/iwl-helpers.h
index 8993cca81b4..736b88881b0 100644
--- a/drivers/net/wireless/iwlwifi/iwl-helpers.h
+++ b/drivers/net/wireless/iwlwifi/iwl-helpers.h
@@ -254,6 +254,26 @@ static inline u8 iwl_get_dma_hi_address(dma_addr_t addr)
return sizeof(addr) > sizeof(u32) ? (addr >> 16) >> 16 : 0;
}
+/**
+ * iwl_queue_inc_wrap - increment queue index, wrap back to beginning
+ * @index -- current index
+ * @n_bd -- total number of entries in queue (must be power of 2)
+ */
+static inline int iwl_queue_inc_wrap(int index, int n_bd)
+{
+ return ++index & (n_bd - 1);
+}
+
+/**
+ * iwl_queue_dec_wrap - decrement queue index, wrap back to end
+ * @index -- current index
+ * @n_bd -- total number of entries in queue (must be power of 2)
+ */
+static inline int iwl_queue_dec_wrap(int index, int n_bd)
+{
+ return --index & (n_bd - 1);
+}
+
/* TODO: Move fw_desc functions to iwl-pci.ko */
static inline void iwl_free_fw_desc(struct pci_dev *pci_dev,
struct fw_desc *desc)