On 6/10/24 01:37, David Wei wrote:
On 2024-06-07 17:52, Jason Gunthorpe wrote:
IMHO it seems to compose poorly if you can only use the io_uring
lifecycle model with io_uring registered memory, and not with DMABUF
memory registered through Mina's mechanism.
By this, do you mean io_uring must be exclusively used to use this
feature?
And you'd rather see the two decoupled, so userspace can register w/ say
dmabuf then pass it to io_uring?
Personally, I have no clue what Jason means. You can just as
well say that it's poorly composable that write(2) to a disk
cannot post a completion into a XDP ring, or a netlink socket,
or io_uring's main completion queue, or name any other API.
The devmem TCP callback can implement it in a way feasible to
the project, but it cannot directly post events to an unrelated
API like io_uring. And devmem attaches buffers to a socket,
for which a ring for returning buffers might even be a nuisance.
--
Pavel Begunkov
