Date: Thu, 3 Mar 2022 19:06:32 +0100 From: Santiago Martinez <sm@codenetworks.net> To: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: FBSD-13 - Vale maximum virtual switches. Message-ID: <87d079ec-13da-6c8f-a801-5e68ca696466@codenetworks.net>
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Hi Everyone,
The other day had to simulate a network topology and I wanted to use
vale switches instead of in-kernel bridges.
After creating a few switches I notice that there was a hard limit of 8
switches ( that is clearly stated on the man page).
For my simulation I needed 32 virtual switches, hence I increase the
value of NM_BRIDGES from 8 to 64.
After that I was able to create the bridges and they seem to work fine.
My question is, do we need that hard limit on 8? Should this be change
to a dynamic value set with sysctl?
Best regards.
Santi
diff --git a/sys/dev/netmap/netmap_bdg.h b/sys/dev/netmap/netmap_bdg.h
index e4683885e66c..3afe1d9d5d99 100644
--- a/sys/dev/netmap/netmap_bdg.h
+++ b/sys/dev/netmap/netmap_bdg.h
@@ -73,8 +73,8 @@struct netmap_bdg_ops {
int netmap_bwrap_attach(const char *name, struct netmap_adapter *,
struct netmap_bdg_ops *);
int netmap_bdg_regops(const char *name, struct netmap_bdg_ops *bdg_ops,
void *private_data, void *auth_token);
-#define NM_BRIDGES 8 /* number of bridges */
-#define NM_BDG_MAXPORTS 254 /* up to 254 */
+#define NM_BRIDGES 64 /* number of bridges */
+#define NM_BDG_MAXPORTS 16 /* up to 254 */
#define NM_BDG_BROADCAST NM_BDG_MAXPORTS
#define NM_BDG_NOPORT (NM_BDG_MAXPORTS+1)
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<p><span style="color: rgb(0, 0, 0); background-color: rgb(255, 255,
255);"><span style="color: rgb(0, 0, 0); background-color:
rgb(255, 255, 255);">Hi Everyone, <br>
</span></span></p>
<p><span style="color: rgb(0, 0, 0); background-color: rgb(255, 255,
255);"><span style="color: rgb(0, 0, 0); background-color:
rgb(255, 255, 255);">The other day had to simulate a network
topology and I wanted to use vale switches instead of
in-kernel bridges.</span></span></p>
<p><span style="color: rgb(0, 0, 0); background-color: rgb(255, 255,
255);"><span style="color: rgb(0, 0, 0); background-color:
rgb(255, 255, 255);">After creating a few switches I notice
that there was a hard limit of 8 switches ( that is clearly
stated on the man page).</span></span></p>
<p><span style="color: rgb(0, 0, 0); background-color: rgb(255, 255,
255);"><span style="color: rgb(0, 0, 0); background-color:
rgb(255, 255, 255);">For my simulation I needed 32 virtual
switches, hence I increase the value of NM_BRIDGES from 8 to
64.</span></span></p>
<p><span style="color: rgb(0, 0, 0); background-color: rgb(255, 255,
255);"><span style="color: rgb(0, 0, 0); background-color:
rgb(255, 255, 255);">After that I was able to create the
bridges and they seem to work fine.<br>
</span></span></p>
<p><span style="color: rgb(0, 0, 0); background-color: rgb(255, 255,
255);"><span style="color: rgb(0, 0, 0); background-color:
rgb(255, 255, 255);">My question is, do we need that hard
limit on 8? Should this be change to a dynamic value set with
sysctl?</span></span></p>
<p><span style="color: rgb(0, 0, 0); background-color: rgb(255, 255,
255);"><span style="color: rgb(0, 0, 0); background-color:
rgb(255, 255, 255);">
Best regards.<br>
Santi</span></span></p>
<p><span style="font-family:monospace"><span
style="font-weight:bold;color:#000000;background-color:#ffffff;">diff
--git a/sys/dev/netmap/netmap_bdg.h
b/sys/dev/netmap/netmap_bdg.h</span><span
style="color:#000000;background-color:#ffffff;">
</span></span></p>
<span style="font-family:monospace"></span>
<p><span style="font-family:monospace"><span
style="font-weight:bold;color:#000000;background-color:#ffffff;">index
e4683885e66c..3afe1d9d5d99 100644</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span
style="font-weight:bold;color:#000000;background-color:#ffffff;">---
a/sys/dev/netmap/netmap_bdg.h</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span
style="font-weight:bold;color:#000000;background-color:#ffffff;">+++
b/sys/dev/netmap/netmap_bdg.h</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#18b2b2;background-color:#ffffff;">@@ -73,8
+73,8 @@</span><span
style="color:#000000;background-color:#ffffff;"> struct
netmap_bdg_ops {
</span><br>
int netmap_bwrap_attach(const char *name, struct netmap_adapter
*, struct netmap_bdg_ops *);
<br>
int netmap_bdg_regops(const char *name, struct netmap_bdg_ops
*bdg_ops, void *private_data, void *auth_token);
<br>
<br>
<span style="color:#b21818;background-color:#ffffff;">-#define
NM_BRIDGES 8 /* number of bridges */</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#b21818;background-color:#ffffff;">-#define
NM_BDG_MAXPORTS 254 /* up to 254 */</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#18b218;background-color:#ffffff;">+#define
NM_BRIDGES 64 /* number of bridges */</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#18b218;background-color:#ffffff;">+#define
NM_BDG_MAXPORTS 16 /* up to 254 */</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
#define NM_BDG_BROADCAST NM_BDG_MAXPORTS
<br>
#define NM_BDG_NOPORT (NM_BDG_MAXPORTS+1)<br>
<br>
<br>
</span></p>
<p><br>
</p>
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