From: Michael Brown <mcb30@etherboot.org>
Date: Wed, 19 Apr 2006 01:54:24 +0000 (+0000)
Subject: Added pkb_unput() and pkb_len().
X-Git-Tag: v0.9.3~1509
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ab139ceda9b9f03fcc0884e97e29810a693b6469;p=thirdparty%2Fipxe.git

Added pkb_unput() and pkb_len().
---

diff --git a/src/include/gpxe/pkbuff.h b/src/include/gpxe/pkbuff.h
index 54d8511c2..bcc304977 100644
--- a/src/include/gpxe/pkbuff.h
+++ b/src/include/gpxe/pkbuff.h
@@ -68,6 +68,17 @@ static inline void * pkb_put ( struct pk_buff *pkb, size_t len ) {
 	return old_tail;
 }
 
+/**
+ * Remove data from end of packet buffer
+ *
+ * @v pkb	Packet buffer
+ * @v len	Length to remove
+ */
+static inline void pkb_unput ( struct pk_buff *pkb, size_t len ) {
+	pkb->tail -= len;
+	assert ( pkb->tail >= pkb->data );
+}
+
 /**
  * Empty a packet buffer
  *
@@ -77,4 +88,14 @@ static inline void pkb_empty ( struct pk_buff *pkb ) {
 	pkb->tail = pkb->data;
 }
 
+/**
+ * Calculate length of data in a packet buffer
+ *
+ * @v pkb	Packet buffer
+ * @ret len	Length of data in buffer
+ */
+static inline size_t pkb_len ( struct pk_buff *pkb ) {
+	return ( pkb->tail - pkb->data );
+}
+
 #endif /* _PKBUFF_H */