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* [dpdk-dev] [PATCH 0/19] Separate compile time linkage between eal lib and pmd's
@ 2014-04-10 20:47 Neil Horman
  2014-04-10 20:49 ` [dpdk-dev] [PATCH 01/19] makefiles: Fixed -share command line option error Neil Horman
  2014-04-12 11:04 ` [dpdk-dev] [PATCH 0/19] Separate compile time linkage between eal lib and pmd's Neil Horman
  0 siblings, 2 replies; 23+ messages in thread
From: Neil Horman @ 2014-04-10 20:47 UTC (permalink / raw)
  To: dev

Disconnect compile time linkage between eal library / applications and pmd's

I noticed that, while tinkering with dpdk, building for shared libraries still
resulted in all the test applications linking to all the built pmd's, despite
not actually needing them all.  We are able to tell an application at run time
(via the -d/--blacklist/--whitelist/--vdev options) which pmd's we want to use, and
so have no need to link them at all. The only reason they get pulled in is
because rte_eal_non_pci_init_etherdev and rte_pmd_init_all contain static lists
to the individual pmd init functions. The result is that, even when building as
DSO's, we have to load all the pmd libraries, which is space inefficient and
defeating of some of the purpose of shared objects. 

To correct this, I developed this patch series, which introduces two new macros,
PMD_INIT_NONPCI and PMD_INIT.  These two macros use constructors to register
their init routines at runtime, either prior to the execution of main() when
linked statically, or when dlopen is called on a DSO at run time.  The result is
that PMD's can be loaded at run time without the application or eal library
having to hold a reference to them.  They work in a very simmilar fashion to the
module_init routine in the linux kernel.

I've tested this feature using the igb and pcap pmd's, both statically and
dynamically linked with the test and testpmd sample applications, and it seems
to work well.

Note, I encountered  a few bugs along the way, which I fixed and noted in the
series.

Regards
Neil

^ permalink raw reply	[flat|nested] 23+ messages in thread

end of thread, other threads:[~2014-04-15 13:46 UTC | newest]

Thread overview: 23+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2014-04-10 20:47 [dpdk-dev] [PATCH 0/19] Separate compile time linkage between eal lib and pmd's Neil Horman
2014-04-10 20:49 ` [dpdk-dev] [PATCH 01/19] makefiles: Fixed -share command line option error Neil Horman
2014-04-10 20:49   ` [dpdk-dev] [PATCH 02/19] pmd: Add PMD_INIT_NONPCI macros Neil Horman
2014-04-10 20:49   ` [dpdk-dev] [PATCH 03/19] eal: dlopen the DSO built poll mode drivers before init Neil Horman
2014-04-10 20:49   ` [dpdk-dev] [PATCH 04/19] pcap: Convert pcap poll mode driver to use new PMD_INIT_NONPCI macro Neil Horman
2014-04-10 20:49   ` [dpdk-dev] [PATCH 05/19] ring: convert the ring pmd driver to use the " Neil Horman
2014-04-10 20:49   ` [dpdk-dev] [PATCH 06/19] xenvert: Convert xenvirt pmd to use " Neil Horman
2014-04-10 20:49   ` [dpdk-dev] [PATCH 07/19] pmd: remove dead code Neil Horman
2014-04-10 20:49   ` [dpdk-dev] [PATCH 08/19] test: fix test app to dynamically link pmd_pcap when needed Neil Horman
2014-04-10 20:49   ` [dpdk-dev] [PATCH 09/19] testpmd: only link pcap pmd when statically linking Neil Horman
2014-04-10 20:50   ` [dpdk-dev] [PATCH 10/19] make: include whole archive on static link Neil Horman
2014-04-10 20:50   ` [dpdk-dev] [PATCH 11/19] pmd: Move rte_pmd_init_all to be non-inline Neil Horman
2014-04-10 20:50   ` [dpdk-dev] [PATCH 12/19] pmd: Add PMD_INIT macro for use in pci based PMDs Neil Horman
2014-04-10 20:50   ` [dpdk-dev] [PATCH 13/19] igb: Convert PMD to use new PMD_INIT macro Neil Horman
2014-04-10 20:50   ` [dpdk-dev] [PATCH 14/19] igbvf: move igbvf pmd to use " Neil Horman
2014-04-10 20:50   ` [dpdk-dev] [PATCH 15/19] em: move em/e1000 " Neil Horman
2014-04-10 20:50   ` [dpdk-dev] [PATCH 16/19] ixgbe: move ixgbe[vf] pmd's " Neil Horman
2014-04-10 20:50   ` [dpdk-dev] [PATCH 17/19] virtio: Move to using " Neil Horman
2014-04-10 20:50   ` [dpdk-dev] [PATCH 18/19] vmxnet3: move " Neil Horman
2014-04-10 20:50   ` [dpdk-dev] [PATCH 19/19] pmd: Not having any pci dev pmds shouldn't be fatal Neil Horman
2014-04-12 11:04 ` [dpdk-dev] [PATCH 0/19] Separate compile time linkage between eal lib and pmd's Neil Horman
2014-04-15  8:31   ` Thomas Monjalon
2014-04-15 13:46     ` Neil Horman

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