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authorPavel Begunkov <asml.silence@gmail.com>2022-07-12 23:52:38 +0300
committerJens Axboe <axboe@kernel.dk>2022-07-25 03:41:06 +0300
commiteb42cebb2cf24c48f60c32856a4bba93d42659c8 (patch)
tree7f38b276b8929be376bb7bb3da7adff9d7311a4b /io_uring/Makefile
parente70cb60893ca64b7df06864aa16c1cf6d6c671db (diff)
downloadlinux-eb42cebb2cf24c48f60c32856a4bba93d42659c8.tar.xz
io_uring: add zc notification infrastructure
Add internal part of send zerocopy notifications. There are two main structures, the first one is struct io_notif, which carries inside struct ubuf_info and maps 1:1 to it. io_uring will be binding a number of zerocopy send requests to it and ask to complete (aka flush) it. When flushed and all attached requests and skbs complete, it'll generate one and only one CQE. There are intended to be passed into the network layer as struct msghdr::msg_ubuf. The second concept is notification slots. The userspace will be able to register an array of slots and subsequently addressing them by the index in the array. Slots are independent of each other. Each slot can have only one notifier at a time (called active notifier) but many notifiers during the lifetime. When active, a notifier not going to post any completion but the userspace can attach requests to it by specifying the corresponding slot while issueing send zc requests. Eventually, the userspace will want to "flush" the notifier losing any way to attach new requests to it, however it can use the next atomatically added notifier of this slot or of any other slot. When the network layer is done with all enqueued skbs attached to a notifier and doesn't need the specified in them user data, the flushed notifier will post a CQE. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/3ecf54c31a85762bf679b0a432c9f43ecf7e61cc.1657643355.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring/Makefile')
-rw-r--r--io_uring/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/io_uring/Makefile b/io_uring/Makefile
index 466639c289be..8cc8e5387a75 100644
--- a/io_uring/Makefile
+++ b/io_uring/Makefile
@@ -7,5 +7,5 @@ obj-$(CONFIG_IO_URING) += io_uring.o xattr.o nop.o fs.o splice.o \
openclose.o uring_cmd.o epoll.o \
statx.o net.o msg_ring.o timeout.o \
sqpoll.o fdinfo.o tctx.o poll.o \
- cancel.o kbuf.o rsrc.o rw.o opdef.o
+ cancel.o kbuf.o rsrc.o rw.o opdef.o notif.o
obj-$(CONFIG_IO_WQ) += io-wq.o