<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=windows-1252">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<p><br>
</p>
<div class="moz-forward-container"><br>
<br>
-------- Továbbított üzenet --------
<table class="moz-email-headers-table" cellspacing="0"
cellpadding="0" border="0">
<tbody>
<tr>
<th valign="BASELINE" align="RIGHT" nowrap="nowrap">Tárgy: </th>
<td>Actions in P4-16</td>
</tr>
<tr>
<th valign="BASELINE" align="RIGHT" nowrap="nowrap">Dátum: </th>
<td>Tue, 7 Nov 2017 17:16:50 +0000</td>
</tr>
<tr>
<th valign="BASELINE" align="RIGHT" nowrap="nowrap">Feladó:
</th>
<td>Dumitrescu, Cristian
<a class="moz-txt-link-rfc2396E" href="mailto:cristian.dumitrescu@intel.com"><cristian.dumitrescu@intel.com></a></td>
</tr>
<tr>
<th valign="BASELINE" align="RIGHT" nowrap="nowrap">Címzett:
</th>
<td>Sándor Laki <a class="moz-txt-link-rfc2396E" href="mailto:lakis@inf.elte.hu"><lakis@inf.elte.hu></a>, Tejfel Máté
<a class="moz-txt-link-rfc2396E" href="mailto:matej@caesar.elte.hu"><matej@caesar.elte.hu></a>, 'Horpácsi Dániel'
<a class="moz-txt-link-rfc2396E" href="mailto:daniel-h@elte.hu"><daniel-h@elte.hu></a></td>
</tr>
<tr>
<th valign="BASELINE" align="RIGHT" nowrap="nowrap">CC: </th>
<td><a class="moz-txt-link-abbreviated" href="mailto:Gergely.Pongracz@Ericsson.com">Gergely.Pongracz@Ericsson.com</a>
<a class="moz-txt-link-rfc2396E" href="mailto:Gergely.Pongracz@Ericsson.com"><Gergely.Pongracz@Ericsson.com></a>, Kinsella, Ray
<a class="moz-txt-link-rfc2396E" href="mailto:ray.kinsella@intel.com"><ray.kinsella@intel.com></a>, Ferriter, Cian
<a class="moz-txt-link-rfc2396E" href="mailto:cian.ferriter@intel.com"><cian.ferriter@intel.com></a>, Zhu, Heqing
<a class="moz-txt-link-rfc2396E" href="mailto:heqing.zhu@intel.com"><heqing.zhu@intel.com></a></td>
</tr>
</tbody>
</table>
<br>
<br>
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
<meta name="Generator" content="Microsoft Word 15 (filtered
medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph
{mso-style-priority:34;
margin-top:0cm;
margin-right:0cm;
margin-bottom:0cm;
margin-left:36.0pt;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
/* List Definitions */
@list l0
{mso-list-id:536892058;
mso-list-type:hybrid;
mso-list-template-ids:-2002247160 403243023 403243033 403243035 403243023 403243033 403243035 403243023 403243033 403243035;}
@list l0:level1
{mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level2
{mso-level-number-format:alpha-lower;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level3
{mso-level-number-format:roman-lower;
mso-level-tab-stop:none;
mso-level-number-position:right;
text-indent:-9.0pt;}
@list l0:level4
{mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level5
{mso-level-number-format:alpha-lower;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level6
{mso-level-number-format:roman-lower;
mso-level-tab-stop:none;
mso-level-number-position:right;
text-indent:-9.0pt;}
@list l0:level7
{mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level8
{mso-level-number-format:alpha-lower;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level9
{mso-level-number-format:roman-lower;
mso-level-tab-stop:none;
mso-level-number-position:right;
text-indent:-9.0pt;}
ol
{margin-bottom:0cm;}
ul
{margin-bottom:0cm;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-US">Hi guys,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I have read the P4-16
spec and I have some questions on actions, it would be great
to have your input:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
lang="EN-US"><span style="mso-list:Ignore">1.<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">Action
implementations. My takeaway is that actions are implemented
using the two mechanisms below, did I miss any other
mechanism?<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0
level2 lfo1">
<!--[if !supportLists]--><span lang="EN-US"><span
style="mso-list:Ignore">a.<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">Statements
and expressions. Similar to writing a C function. Departure
from P4-14, where actions could only be built using a
(small) predefined set of primitive actions.<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="margin-left:108.0pt;text-indent:-108.0pt;mso-text-indent-alt:-9.0pt;mso-list:l0
level3 lfo1">
<!--[if !supportLists]--><span lang="EN-US"><span
style="mso-list:Ignore"><span style="font:7.0pt
"Times New Roman"">
</span>i.<span style="font:7.0pt "Times New
Roman""> </span></span></span><!--[endif]--><span
lang="EN-US">Inputs: packet headers, packet meta-data, table
entry data<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="margin-left:108.0pt;text-indent:-108.0pt;mso-text-indent-alt:-9.0pt;mso-list:l0
level3 lfo1">
<!--[if !supportLists]--><span lang="EN-US"><span
style="mso-list:Ignore"><span style="font:7.0pt
"Times New Roman"">
</span>ii.<span style="font:7.0pt "Times New
Roman""> </span></span></span><!--[endif]--><span
lang="EN-US">Outputs: packet headers, packet meta-data,
(table entry data?)<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0
level2 lfo1">
<!--[if !supportLists]--><span lang="EN-US"><span
style="mso-list:Ignore">b.<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">Extern
object instantiations and extern functions. This allows
pushing out of the language some P4-14 objects such as:
meters, registers, counters.<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
lang="EN-US"><span style="mso-list:Ignore">2.<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">For
a given table, several actions can be defined; each table
entry (including the default entry) has exactly one action
from the action list of the table, right?<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0
level2 lfo1">
<!--[if !supportLists]--><span lang="EN-US"><span
style="mso-list:Ignore">a.<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">If
entry X does operations {A, B, C, D, E} and entry Y does
operations {A, B, C, D, F}, we need to implement actionX
(doing A, B, C, D,E) and actionY (doing A, B, C, D, F)
explicitly and map them to entries X and Y, as opposed to
saying: entry X executes actions A, B, C, D, E and entry Y
executes actions A, B, C, D, F, right?<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
lang="EN-US"><span style="mso-list:Ignore">3.<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">Action
portability. If we use extern objects and functions, the
actions are not that portable anymore, right? They become
target specific and P4 program can only work for that
target.<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
lang="EN-US"><span style="mso-list:Ignore">4.<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">Can
an action modify the table entry data or is table entry data
read-only?<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0
level2 lfo1">
<!--[if !supportLists]--><span lang="EN-US"><span
style="mso-list:Ignore">a.<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">Example:
implement a packet counter per flow; pkt hits table entry, a
counter stored in the entry gets incremented. Is this
possible in P4-16?<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
lang="EN-US"><span style="mso-list:Ignore">5.<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">Do
you have examples of P4-16 actions that you could share? The
more examples the better.<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
lang="EN-US"><span style="mso-list:Ignore">6.<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">Can
somebody give me an example for the “implementation” key
word from section 12.2.1.5 Additional properties and the
associated concept of action profile, please ?<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
lang="EN-US"><span style="mso-list:Ignore">7.<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">When
should we expect P4-16 support in the T4P4S compiler?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks very much for
your help!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Cristian<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
</div>
</div>
</body>
</html>