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<p class=MsoNormal><span style='color:#1F497D'>Hi Stan,<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'>Shuter_shut should not be called
twice. In the case that it will than it will probably stay shut “for ever”.<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'>The real question is whether it
can be called twice. I believe that there is an assumption in the code that once
reset is called shut down cannot be called, so the shutter will not be called
twice.<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>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
ofw-bounces@lists.openfabrics.org [mailto:ofw-bounces@lists.openfabrics.org] <b>On
Behalf Of </b>Alex Naslednikov<br>
<b>Sent:</b> Wednesday, October 06, 2010 1:13 PM<br>
<b>To:</b> ofw@lists.openfabrics.org<br>
<b>Subject:</b> [ofw] [Patch][IPoIB_NIDS6_CM] Adding shutter_shut for Adapter
Reset flow<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The patch below prevents race with BSOD when NDIS call
receive callback of ipoib while <o:p></o:p></p>
<p class=MsoNormal>some ipoib global objects are under destruction (like
p_adapter ->p_port).<o:p></o:p></p>
<p class=MsoNormal>It was tested by night regression run on IPoIB driver<o:p></o:p></p>
<p class=MsoNormal>---<o:p></o:p></p>
<p class=MsoNormal>Adding shutter_shut for Adapter Reset flow<o:p></o:p></p>
<p class=MsoNormal>Signed-off by: Alexander Naslednikov (xalex at
mellanox.co.il)<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Index: kernel/ipoib_adapter.cpp<o:p></o:p></p>
<p class=MsoNormal>===================================================================<o:p></o:p></p>
<p class=MsoNormal>--- kernel/ipoib_adapter.cpp
(revision 2938)<o:p></o:p></p>
<p class=MsoNormal>+++ kernel/ipoib_adapter.cpp (working copy)<o:p></o:p></p>
<p class=MsoNormal>@@ -988,10 +988,13 @@<o:p></o:p></p>
<p class=MsoNormal>
p_adapter->reset = TRUE;<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>
if( p_adapter->h_pnp )<o:p></o:p></p>
<p class=MsoNormal>-
{<o:p></o:p></p>
<p class=MsoNormal>+
{
<o:p></o:p></p>
<p class=MsoNormal>+
<o:p></o:p></p>
<p class=MsoNormal>
h_pnp = p_adapter->h_pnp;<o:p></o:p></p>
<p class=MsoNormal>
p_adapter->h_pnp = NULL;<o:p></o:p></p>
<p class=MsoNormal>
status = p_adapter->p_ifc->dereg_pnp( h_pnp, __ipoib_pnp_dereg );<o:p></o:p></p>
<p class=MsoNormal>+
// Wait until NDIS will return all indicated NBLs that were received<o:p></o:p></p>
<p class=MsoNormal>+
shutter_shut( &p_adapter->recv_shutter );<o:p></o:p></p>
<p class=MsoNormal>
if( status == IB_SUCCESS )<o:p></o:p></p>
<p class=MsoNormal>
status = IB_NOT_DONE;<o:p></o:p></p>
<p class=MsoNormal>
}<o:p></o:p></p>
<p class=MsoNormal>Index: kernel/ipoib_port.cpp<o:p></o:p></p>
<p class=MsoNormal>===================================================================<o:p></o:p></p>
<p class=MsoNormal>---
kernel/ipoib_port.cpp
(revision 2946)<o:p></o:p></p>
<p class=MsoNormal>+++
kernel/ipoib_port.cpp
(working copy)<o:p></o:p></p>
<p class=MsoNormal>@@ -830,11 +830,15 @@<o:p></o:p></p>
<p class=MsoNormal>
IPOIB_PRINT( TRACE_LEVEL_ERROR, IPOIB_DBG_OBJ,<o:p></o:p></p>
<p class=MsoNormal>
("ref type %d ref_cnt %d\n", ref_init, p_port->obj.ref_cnt) );<o:p></o:p></p>
<p class=MsoNormal> #endif<o:p></o:p></p>
<p class=MsoNormal>-
// The port is started as paused and NDIS calls latter to ipoib_restart. We<o:p></o:p></p>
<p class=MsoNormal>-
// shut the recv_shuter for now and alive it on ipoib_restart. We did<o:p></o:p></p>
<p class=MsoNormal>-
// it in this way since MpInitializeInternal also calls in reset and than<o:p></o:p></p>
<p class=MsoNormal>-
// we need to set the rec ref count to 1 //TODO !!!!!!!!!!1<o:p></o:p></p>
<p class=MsoNormal>-
//<o:p></o:p></p>
<p class=MsoNormal>+
/* The steps of the initialization are as depicted below:<o:p></o:p></p>
<p class=MsoNormal>+
I.
adapter_init() calls shutter_init(), the shutter counter is set to 0<o:p></o:p></p>
<p class=MsoNormal>+
II.
ipoib_pnp_cb() calls to ipoib_port_init() that calls to __port_init() that
SHOULD set shutter counter to -MAX_OPERATIONS<o:p></o:p></p>
<p class=MsoNormal>+
That is, the code below should call to shutter_shut()<o:p></o:p></p>
<p class=MsoNormal>+
III.NDIS calls to ipoib_restart() that calls to shutter_alive. Now,
shutter_counter is again 0.<o:p></o:p></p>
<p class=MsoNormal>+
IV. NDIS call to
ipoib_pause() that sets the adapter to pause state, calls to shutter_shut. <o:p></o:p></p>
<p class=MsoNormal>+
Now, the counter is again equals to -MAX_OPERATIONS<o:p></o:p></p>
<p class=MsoNormal>+
V. NDIS calls
to ipoib_restart that calls to shutter_alive. Shutter counter is 0 and we can
start working<o:p></o:p></p>
<p class=MsoNormal>+
*/<o:p></o:p></p>
<p class=MsoNormal>
<o:p></o:p></p>
<p class=MsoNormal>
if ( p_adapter->ipoib_state == IPOIB_INIT) {<o:p></o:p></p>
<p class=MsoNormal>
IPOIB_PRINT( TRACE_LEVEL_INFORMATION, IPOIB_DBG_RECV,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><b>Alexander (XaleX) Naslednikov<o:p></o:p></b></p>
<p class=MsoNormal><b>SW Networking Team<o:p></o:p></b></p>
<p class=MsoNormal><b>Mellanox Technologies<o:p></o:p></b></p>
<p class=MsoNormal><o:p> </o:p></p>
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