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netmap: add a tunable for the maximum number of VALE switches

Description

netmap: add a tunable for the maximum number of VALE switches

The new dev.netmap.max_bridges sysctl tunable can be set in
loader.conf(5) to change the default maximum number of VALE
switches that can be created. Current defaults is 8.

MFC after: 2 weeks

(cherry picked from commit dd6ab49a9aebb5fbb85973d9a859d24daa5e2165)

Details

Provenance
vmaffioneAuthored on Mar 6 2022, 5:28 PM
Parents
rG606f528decc3: netmap: Fix integer overflow in nmreq_copyin
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