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iflib: netmap: add support for NS_MOREFRAG

Description

iflib: netmap: add support for NS_MOREFRAG

The NS_MOREFRAG flag can be set in a netmap slot to represent a
multi-fragment packet. Only the last fragment of a packet does
not have the flag set. On TX rings, the flag may be set by the
userspace application. The kernel will look at the flag and use it
to properly set up the NIC TX descriptors.
On RX rings, the kernel may set the flag if the packet received
was split across multiple netmap buffers. The userspace application
should look at the flag to know when the packet is complete.

Submitted by: rajesh1.kumar_amd.com
Reviewed by: vmaffione
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D27799

(cherry picked from commit aceaccab659c9eb846fb21ff99be34434a9616c7)

Details

Provenance
vmaffioneAuthored on Jan 24 2021, 9:12 PM
Reviewer
vmaffione
Differential Revision
D27799: Iflib changes to handle multiple netmap fragments
Parents
rG2df415116eee: MFC 0e01ea872ee475d7aef11d21588504e2ef4eb32c:
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