From 68fd49e8f56a1a5c52590626b72e8faa1d395ffb Mon Sep 17 00:00:00 2001
From: John Baldwin <jhb@FreeBSD.org>
Date: Tue, 9 Jan 2024 11:00:19 -0800
Subject: [PATCH] mbuf: Add mbufq_empty

Complement to the existing mbufq_full

Reviewed by:	bz
Sponsored by:	Chelsio Communications
Differential Revision:	https://reviews.freebsd.org/D43337

(cherry picked from commit 76f405ed63540aa2d989c231f70277062e76ccfb)
---
 sys/sys/mbuf.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sys/sys/mbuf.h b/sys/sys/mbuf.h
index 2183d5b848f..757eba3165f 100644
--- a/sys/sys/mbuf.h
+++ b/sys/sys/mbuf.h
@@ -1609,6 +1609,12 @@ mbufq_last(const struct mbufq *mq)
 	return (STAILQ_LAST(&mq->mq_head, mbuf, m_stailqpkt));
 }
 
+static inline bool
+mbufq_empty(const struct mbufq *mq)
+{
+	return (mq->mq_len == 0);
+}
+
 static inline int
 mbufq_full(const struct mbufq *mq)
 {