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cxgbe(4): Initialize the rx buffer's metadata on first-use and not on

Description

cxgbe(4): Initialize the rx buffer's metadata on first-use and not on
allocation.

refill_fl doesn't touch any part of a freshly allocated cluster after
this change.

MFC after: 1 week
Sponsored by: Chelsio Communications

Details

Provenance
npAuthored on
Parents
rS357474: cxgbe(4): Only checksummed TCP should be considered for LRO.
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