git/linux-cryptodev-2.6
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git synced 2026-04-18 03:23:53 -04:00
Code Issues Packages Projects Releases Wiki Activity

io_uring: add register/unregister napi function

Browse Source 
This adds an api to register and unregister the napi for io-uring. If
the arg value is specified when unregistering, the current napi setting
for the busy poll timeout is copied into the user structure. If this is
not required, NULL can be passed as the arg value.

Signed-off-by: Stefan Roesch <shr@devkernel.io>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/20230608163839.2891748-7-shr@devkernel.io
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Stefan Roesch
2023-06-08 09:38:38 -07:00
committed by Jens Axboe
parent ff183d427d
commit ef1186c1a8
4 changed files with 88 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

52
io_uring/napi.c
View File

@@ -207,6 +207,58 @@ void io_napi_free(struct io_ring_ctx *ctx)
spin_unlock(&ctx->napi_lock);
}
/*
* io_napi_register() - Register napi with io-uring
* @ctx: pointer to io-uring context structure
* @arg: pointer to io_uring_napi structure
*
* Register napi in the io-uring context.
*/
int io_register_napi(struct io_ring_ctx *ctx, void __user *arg)
{
const struct io_uring_napi curr = {
.busy_poll_to = ctx->napi_busy_poll_to,
.prefer_busy_poll = ctx->napi_prefer_busy_poll
};
struct io_uring_napi napi;
if (copy_from_user(&napi, arg, sizeof(napi)))
return -EFAULT;
if (napi.pad[0] || napi.pad[1] || napi.pad[2] || napi.resv)
return -EINVAL;
WRITE_ONCE(ctx->napi_busy_poll_to, napi.busy_poll_to);
WRITE_ONCE(ctx->napi_prefer_busy_poll, !!napi.prefer_busy_poll);
if (copy_to_user(arg, &curr, sizeof(curr)))
return -EFAULT;
return 0;
}
/*
* io_napi_unregister() - Unregister napi with io-uring
* @ctx: pointer to io-uring context structure
* @arg: pointer to io_uring_napi structure
*
* Unregister napi. If arg has been specified copy the busy poll timeout and
* prefer busy poll setting to the passed in structure.
*/
int io_unregister_napi(struct io_ring_ctx *ctx, void __user *arg)
{
const struct io_uring_napi curr = {
.busy_poll_to = ctx->napi_busy_poll_to,
.prefer_busy_poll = ctx->napi_prefer_busy_poll
};
if (arg && copy_to_user(arg, &curr, sizeof(curr)))
return -EFAULT;
WRITE_ONCE(ctx->napi_busy_poll_to, 0);
WRITE_ONCE(ctx->napi_prefer_busy_poll, false);
return 0;
}
/*
* __io_napi_adjust_timeout() - Add napi id to the busy poll list
* @ctx: pointer to io-uring context structure