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Date:      Fri, 17 Jan 2014 11:23:25 +0000 (UTC)
From:      Gleb Smirnoff <glebius@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-projects@freebsd.org
Subject:   svn commit: r260824 - in projects/sendfile/sys: kern sys
Message-ID:  <201401171123.s0HBNPop041831@svn.freebsd.org>
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Author: glebius
Date: Fri Jan 17 11:23:24 2014
New Revision: 260824
URL: http://svnweb.freebsd.org/changeset/base/260824

Log:
  sbready() function tells that 'count' mbufs starting from the 'm'
  in the buffer 'sb' are now ready.
  
  Function returns 0 if 'm' was the first one, and now socket has data
  to send, otherwise EWOULDBLOCK.
  
  Sponsored by:	Netflix
  Sponsored by:	Nginx, Inc.

Modified:
  projects/sendfile/sys/kern/uipc_sockbuf.c
  projects/sendfile/sys/sys/sockbuf.h

Modified: projects/sendfile/sys/kern/uipc_sockbuf.c
==============================================================================
--- projects/sendfile/sys/kern/uipc_sockbuf.c	Fri Jan 17 11:20:23 2014	(r260823)
+++ projects/sendfile/sys/kern/uipc_sockbuf.c	Fri Jan 17 11:23:24 2014	(r260824)
@@ -84,6 +84,44 @@ sb_shift_nrdy(struct sockbuf *sb, struct
 	sb->sb_fnrdy = m;
 }
 
+int
+sbready(struct sockbuf *sb, struct mbuf *m, int count)
+{
+	u_int blocker;
+
+	SOCKBUF_LOCK(sb);
+
+	KASSERT(sb->sb_fnrdy != NULL, ("%s: sb %p NULL fnrdy", __func__, sb));
+
+	blocker = (sb->sb_fnrdy == m) ? M_BLOCKED : 0;
+
+	for (int i = 0; i < count; i++, m = m->m_next) {
+		KASSERT(m->m_flags & M_NOTREADY,
+		    ("%s: m %p !M_NOTREADY", __func__, m));
+		m->m_flags &= ~(M_NOTREADY | blocker);
+		sb->sb_acc += m->m_len;
+	}
+
+	if (!blocker) {
+		SOCKBUF_UNLOCK(sb);
+		return (EWOULDBLOCK);
+	}
+
+	/* This one was blocking all the queue. */
+	for (; m && (m->m_flags & M_NOTREADY) == 0; m = m->m_next) {
+		KASSERT(m->m_flags & M_BLOCKED,
+		    ("%s: m %p !M_BLOCKED", __func__, m));
+		m->m_flags &= ~M_BLOCKED;
+		sb->sb_acc += m->m_len;
+	}
+
+	sb->sb_fnrdy = m;
+
+	SOCKBUF_UNLOCK(sb);
+
+	return (0);
+}
+
 /*
  * Adjust sockbuf state reflecting allocation of m.
  */

Modified: projects/sendfile/sys/sys/sockbuf.h
==============================================================================
--- projects/sendfile/sys/sys/sockbuf.h	Fri Jan 17 11:20:23 2014	(r260823)
+++ projects/sendfile/sys/sys/sockbuf.h	Fri Jan 17 11:23:24 2014	(r260824)
@@ -173,6 +173,7 @@ void	sbunlock(struct sockbuf *sb);
 void	sballoc(struct sockbuf *, struct mbuf *);
 void	sbfree(struct sockbuf *, struct mbuf *);
 void	sbmtrim(struct sockbuf *, struct mbuf *, int);
+int	sbready(struct sockbuf *, struct mbuf *, int);
 
 static inline u_int
 sbavail(struct sockbuf *sb)

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