Shirley Ma wrote:
Hello Roland,
IPoIB UD currently supports up to 2K MTU. Below is the draft patch to
enable IPoIB UD 4K MTU support for any IB device who has 4K MTU like IBM
eHCA. This patch limits packet in one page range by setting IPoIB UD MTU
size as 4K-48 (40 GRH, 4 IPoIB header, 4 padding to IP header align) to
avoid two contiguous pages allocation when kernel page size is 4K.
Enabling IPoIB UD 4K MTU relies on both SM to set default broadcast
group 4K MTU and of course switch should support 4K MTU. When SM default
broadcast group MTU sets 2K, IPoIB UD MTU will fall back to 2K.
I have tested 2K MTU. 4K MTU is still under testing. The reason I send
this patch out before my test for review is I want comments as early as
possible. So I can integrate the comments into this patch and hopefully
we can make it into OFED-1.3-rc3 which is around Jan.30.
Hi.
+ if (!ib_query_port(hca, port, &attr))
+ priv->max_ib_mtu = ib_mtu_enum_to_int(attr.);
+ else {
+ printk(KERN_WARNING "%s: ib_query_port %d failed\n",
+ hca->name, port);
+ goto device_init_failed;
+ }
What will happen if the IB port supports 4KB MTU but the operational MTU
of this port is bellow this value?
thanks
Dotan
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