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<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>From:</B> Tzachi Dar [mailto:tzachid@mellanox.co.il]
<BR><B>Sent:</B> Monday, January 03, 2011 11:03 AM<BR><B>To:</B> Smith, Stan;
ofw@lists.openfabrics.org<BR><B>Subject:</B> RE: [ofw] [patch] [ipoib_NDIS6_CM]
The send_lock is being held once __send_cb is calling
__send_complete_net_buffer.<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=WordSection1>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">The lock has to be unlocked
since our call to ndis </SPAN><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt">NdisMSendComplete
can cause NDIS to call us to send in the same dpc, and there we reach a
deadlock.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt">We have
seen this happen once, and we wander why we don’t see that every time.<SPAN
class=430123220-03012011> </SPAN></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt"><SPAN
class=430123220-03012011></SPAN></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt"><SPAN
class=430123220-03012011><FONT color=#000000>OK, makes sense that NDIS could
call back; I was curious on how the problem of holding send_lock locked was
detected.</FONT></SPAN></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt"><SPAN
class=430123220-03012011><FONT color=#000000></FONT></SPAN></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt"><SPAN
class=430123220-03012011><FONT color=#000000>What about the proposed change
to ipoib_port_resume()?</FONT> </SPAN><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt">Thanks<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt">Tzachi<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p> </o:p></SPAN></P>
<DIV
style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 4pt; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: blue 1.5pt solid; PADDING-TOP: 0in">
<DIV>
<DIV
style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">From:</SPAN></B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt"> Smith, Stan
[mailto:stan.smith@intel.com] <BR><B>Sent:</B> Monday, January 03, 2011 8:09
PM<BR><B>To:</B> Tzachi Dar; ofw@lists.openfabrics.org<BR><B>Subject:</B> RE:
[ofw] [patch] [ipoib_NDIS6_CM] The send_lock is being held once __send_cb is
calling __send_complete_net_buffer.<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt">Hi
Tzachi,</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt"> A
couple of questions:</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"> <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt">Why is
p_port->send_lock is required to be unlocked when calling
NdisMSendNetBufferListsCompleteX() which translates to NdisMSendComplete()
call?</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"> <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt">If
p_port->send_lock is required to be unlocked when calling
NdisMSendNetBufferListsCompleteX(), then ipoib_port_resume()
should call </SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt">__send_complete_net_buffer(
s_buf, NDIS_STATUS_FAILURE, NDIS_SEND_COMPLETE_FLAGS_DISPATCH_LEVEL,
</SPAN><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: red; FONT-SIZE: 10pt">TRUE</SPAN><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt">) not
FALSE</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt">as
send_lock is held over calls to ipoib_port_resume().</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"> <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt">stan.</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"> <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"> <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p> </o:p></SPAN></P>
<DIV style="TEXT-ALIGN: center" class=MsoNormal align=center><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt">
<HR align=center SIZE=2 width="100%">
</SPAN></DIV>
<P style="MARGIN-BOTTOM: 12pt" class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">From:</SPAN></B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">
ofw-bounces@lists.openfabrics.org [mailto:ofw-bounces@lists.openfabrics.org]
<B>On Behalf Of </B>Tzachi Dar<BR><B>Sent:</B> Saturday, January 01, 2011 11:55
PM<BR><B>To:</B> Tzachi Dar; ofw@lists.openfabrics.org<BR><B>Subject:</B> Re:
[ofw] [patch] [ipoib_NDIS6_CM] The send_lock is being held once __send_cb is
calling __send_complete_net_buffer.</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">Applied on
3053.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">Thanks<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">Tzachi<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p> </o:p></SPAN></P>
<DIV
style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 4pt; PADDING-RIGHT: 0in; BORDER-TOP: medium none; BORDER-RIGHT: blue 1.5pt solid; PADDING-TOP: 0in">
<DIV>
<DIV
style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">From:</SPAN></B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">
ofw-bounces@lists.openfabrics.org [mailto:ofw-bounces@lists.openfabrics.org]
<B>On Behalf Of </B>Tzachi Dar<BR><B>Sent:</B> Sunday, December 26, 2010 6:39
PM<BR><B>To:</B> ofw@lists.openfabrics.org<BR><B>Subject:</B> [ofw] [patch]
[ipoib_NDIS6_CM] The send_lock is being held once __send_cb is calling
__send_complete_net_buffer.<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Index:
D:/projinf2_1_3_1/MLNX_WinOF-2_1_3/ulp/ipoib_NDIS6_CM/kernel/ipoib_port.cpp<o:p></o:p></P>
<P
class=MsoNormal>===================================================================<o:p></o:p></P>
<P class=MsoNormal>---
D:/projinf2_1_3_1/MLNX_WinOF-2_1_3/ulp/ipoib_NDIS6_CM/kernel/ipoib_port.cpp
(revision 7086)<o:p></o:p></P>
<P class=MsoNormal>+++
D:/projinf2_1_3_1/MLNX_WinOF-2_1_3/ulp/ipoib_NDIS6_CM/kernel/ipoib_port.cpp
(revision 7087)<o:p></o:p></P>
<P class=MsoNormal>@@ -6238,7 +6238,7 @@<o:p></o:p></P>
<P
class=MsoNormal>
__send_complete_net_buffer( s_buf,<o:p></o:p></P>
<P
class=MsoNormal>
status,<o:p></o:p></P>
<P
class=MsoNormal>
NDIS_SEND_COMPLETE_FLAGS_DISPATCH_LEVEL,<o:p></o:p></P>
<P
class=MsoNormal>-
FALSE );<o:p></o:p></P>
<P
class=MsoNormal>+
TRUE );<o:p></o:p></P>
<P
class=MsoNormal>
<o:p></o:p></P>
<P
class=MsoNormal>
cl_atomic_dec( &p_port->send_mgr.depth );<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P></DIV></DIV></DIV></BODY></HTML>