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netmap: Check if we already ran mmap before we attempt it
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Authored by nc on Nov 15 2019, 7:27 PM.

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vmaffione
g.lettieri_iet.unipi.it

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rS355133: MFC r354867:
rS354867: netmap: check if we already ran mmap before we attempt it

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rS FreeBSD src repository - subversion

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nc created this revision.Nov 15 2019, 7:27 PM

Herald added subscribers: Contributor Reviews (src), ae, imp. · View Herald TranscriptNov 15 2019, 7:27 PM

lwhsu added a reviewer: vmaffione.Nov 16 2019, 2:39 PM

vmaffione added inline comments.Nov 17 2019, 2:58 PM

head/sys/net/netmap_user.h
985	I would just return here. If done_mmap == 1, it means that somebody already went through the initializations a the end of this function.
1003	This can go away (see above).

vmaffione added a reviewer: g.lettieri_iet.unipi.it.Nov 17 2019, 2:59 PM

Completely makes sense. New diff incorporates your recommended changes.

Just one question: did this change come from some usage scenario? In theory you should not call nm_mmap() more than once.

This revision is now accepted and ready to land.Nov 18 2019, 8:32 PM

I was just grepping through the source tree for TODO occurrences and make patches from them.

Also, how long would it take for the patch to land in HEAD?

I'll do it tonight.

Closed by commit rS354867: netmap: check if we already ran mmap before we attempt it (authored by vmaffione). · Explain WhyNov 19 2019, 9:30 PM

This revision was automatically updated to reflect the committed changes.

vmaffione added a commit: rS354867: netmap: check if we already ran mmap before we attempt it.

vmaffione added a commit: rS355133: MFC r354867:.Nov 27 2019, 6:52 PM

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Diff 64585

head/sys/net/netmap_user.h

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