ena: Handle wrap around for prefetch in netmap
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Authored by osamaabb_amazon.com on Aug 20 2024, 8:47 AM.

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Details

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cperciva

Summary

Netmap index wraps around based on the number of netmap kernel ring
slots.
Currently the driver prefetches the next slot using nm_i + 1 which may
be wrong since it does not handle wrap around.
This patch fixes that by using the kernel API for fetching the next
netmap index.

Approved by: cperciva
MFC after: 2 weeks
Sponsored by: Amazon, Inc.