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authorAlexei Starovoitov <ast@kernel.org>2018-06-03 18:11:35 +0300
committerAlexei Starovoitov <ast@kernel.org>2018-06-03 18:11:36 +0300
commitea9916ea3ed98d0a1f67f5cbe8ed8ae28e37f8c8 (patch)
tree98d1d3475a3b6ca67e1f6eaa65fb4774fa1950cd /include/linux/mISDNif.h
parent69b450789136f70005f8d36315d875158ea430cf (diff)
parentc1ece6b245bd12a57124da78abafbf8a511394d6 (diff)
downloadlinux-ea9916ea3ed98d0a1f67f5cbe8ed8ae28e37f8c8.tar.xz
Merge branch 'ndo_xdp_xmit-cleanup'
Jesper Dangaard Brouer says: ==================== As I mentioned in merge commit 10f678683e4 ("Merge branch 'xdp_xmit-bulking'") I plan to change the API for ndo_xdp_xmit once more, by adding a flags argument, which is done in this patchset. I know it is late in the cycle (currently at rc7), but it would be nice to avoid changing NDOs over several kernel releases, as it is annoying to vendors and distro backporters, but it is not strictly UAPI so it is allowed (according to Alexei). The end-goal is getting rid of the ndo_xdp_flush operation, as it will make it possible for drivers to implement a TXQ synchronization mechanism that is not necessarily derived from the CPU id (smp_processor_id). This patchset removes all callers of the ndo_xdp_flush operation, but it doesn't take the last step of removing it from all drivers. This can be done later, or I can update the patchset on request. Micro-benchmarks only show a very small performance improvement, for map-redirect around ~2 ns, and for non-map redirect ~7 ns. I've not benchmarked this with CONFIG_RETPOLINE, but the performance benefit should be more visible given we end-up removing an indirect call. --- V2: Updated based on feedback from Song Liu <songliubraving@fb.com> ==================== Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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