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dpif-netdev: Implement the API functions to allow multiple handler

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threads read upcall.

This commit implements the API functions to allow multiple handler
threads read upcall.

Also, this commit removes the handling priority of DPIF_UC_MISS
over DPIF_UC_ACTION.  So, both misses will be put to the same
queue.  The decision is based on the fact that a lot has changed
since the age when flow setup rate is most treasured and starving
all actions in the presence of any flow misses doesn't seem like
a sound balancing solution.

Thusly the current implementation will be put in testing and
investigation for better balancing solution will continue if
there is an issue.

Also note, the introduction and use of flow_hash_5tuple() will
put missed ICMP packets from same source but with different
type/code to different handler queues.  This may cause reordering
of these packets.  For now, we do not count this as a problem.

Signed-off-by: Alex Wang <alexw@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
This commit is contained in:
Alex Wang
2014-02-26 10:07:38 -08:00
parent 1954e6bbcb
commit 63be20bee2
3 changed files with 182 additions and 64 deletions
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19
lib/flow.c
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@@ -818,6 +818,25 @@ flow_wildcards_set_reg_mask(struct flow_wildcards *wc, int idx, uint32_t mask)
wc->masks.regs[idx] = mask;
}
/* Calculates the 5-tuple hash from the given flow. */
uint32_t
flow_hash_5tuple(const struct flow *flow, uint32_t basis)
{
uint32_t hash = 0;
if (!flow) {
return 0;
}
hash = mhash_add(hash, (OVS_FORCE unsigned int) flow->nw_src);
hash = mhash_add(basis, (OVS_FORCE unsigned int) flow->nw_dst);
hash = mhash_add(hash, ((OVS_FORCE unsigned int) flow->tp_src << 16)
| (OVS_FORCE unsigned int) flow->tp_dst);
hash = mhash_add(hash, flow->nw_proto);
return mhash_finish(hash, 13);
}
/* Hashes 'flow' based on its L2 through L4 protocol information. */
uint32_t
flow_hash_symmetric_l4(const struct flow *flow, uint32_t basis)