NFC: Reserve tx head and tail room

We can have the NFC core layer allocating the tx head and tail
room for the drivers and avoid 1 or more SKBs copy on write on
the Tx path.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/include/net/nfc.h b/include/net/nfc.h
index cc0130312f70..87b51fe15b70 100644
--- a/include/net/nfc.h
+++ b/include/net/nfc.h
@@ -82,6 +82,9 @@ struct nfc_dev {
         struct nfc_genl_data genl_data;
         u32 supported_protocols;
 
+        int tx_headroom;
+        int tx_tailroom;
+
         struct nfc_ops *ops;
 };
 #define to_nfc_dev(_dev) container_of(_dev, struct nfc_dev, dev)
@@ -89,7 +92,9 @@ struct nfc_dev {
 extern struct class nfc_class;
 
 struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
-                                        u32 supported_protocols);
+                                        u32 supported_protocols,
+                                        int tx_headroom,
+                                        int tx_tailroom);
 
 /**
  * nfc_free_device - free nfc device