Instead of always hard-coding the socket type for the nfs root mount as SOCK_DGRAM (i.e. UDP), respect the value configured earlier.  This allows TCP NFS root mounts using e.g. the boot.nfsroot.options="tcp" tunable.
Instead of always hard-coding the socket type for the nfs root mount as
SOCK_DGRAM (i.e. UDP), respect the value configured earlier.  This allows
TCP NFS root mounts using e.g. the boot.nfsroot.options="tcp" tunable.

In this case some of the connection parameters like the retry timer were
previously set appropriately for TCP but inappropriately for the UDP
socket that was actually used, leading to e.g. extremely long recovery
times (O(hours)) after a nfs server reboot.

Reviewed by:    mohans
MFC After:      2 weeks

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