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netdev: Add reconfigure request mechanism.

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A netdev provider, especially a PMD provider (like netdev DPDK) might
not be able to change some of its parameters (such as MTU, or number of
queues) without stopping everything and restarting.

This commit introduces a mechanism that allows a netdev provider to
request a restart (netdev_request_reconfigure()).  The upper layer can
be notified via netdev_wait_reconf_required() and
netdev_is_reconf_required().  After closing all the rxqs the upper layer
can finally call netdev_reconfigure(), to make sure that the new
configuration is in place.

This will be used by next commit to reconfigure rx and tx queues in
netdev-dpdk.

Signed-off-by: Daniele Di Proietto <diproiettod@vmware.com>
Tested-by: Ilya Maximets <i.maximets@samsung.com>
Acked-by: Ilya Maximets <i.maximets@samsung.com>
Acked-by: Mark Kavanagh <mark.b.kavanagh@intel.com>
This commit is contained in:
Daniele Di Proietto
2016-02-24 17:25:11 -08:00
parent dc36593cf4
commit 790fb3b745
8 changed files with 73 additions and 0 deletions
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1
lib/netdev-linux.c
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@@ -2806,6 +2806,7 @@ netdev_linux_update_flags(struct netdev *netdev_, enum netdev_flags off,
netdev_linux_arp_lookup, \
\
netdev_linux_update_flags, \
NULL, /* reconfigure */ \
\
netdev_linux_rxq_alloc, \
netdev_linux_rxq_construct, \