1#include <linux/kernel.h>
2#include <linux/errno.h>
3#include <linux/file.h>
4#include <linux/slab.h>
5#include <linux/net.h>
6#include <linux/io_uring.h>
7
8#include "io_uring.h"
9#include "notif.h"
10#include "rsrc.h"
11
12static void io_notif_complete_tw_ext(struct io_kiocb *notif, struct io_tw_state *ts)
13{
14	struct io_notif_data *nd = io_notif_to_data(notif);
15	struct io_ring_ctx *ctx = notif->ctx;
16
17	if (nd->zc_report && (nd->zc_copied || !nd->zc_used))
18		notif->cqe.res |= IORING_NOTIF_USAGE_ZC_COPIED;
19
20	if (nd->account_pages && ctx->user) {
21		__io_unaccount_mem(ctx->user, nd->account_pages);
22		nd->account_pages = 0;
23	}
24	io_req_task_complete(notif, ts);
25}
26
27static void io_tx_ubuf_callback(struct sk_buff *skb, struct ubuf_info *uarg,
28				bool success)
29{
30	struct io_notif_data *nd = container_of(uarg, struct io_notif_data, uarg);
31	struct io_kiocb *notif = cmd_to_io_kiocb(nd);
32
33	if (refcount_dec_and_test(&uarg->refcnt))
34		__io_req_task_work_add(notif, IOU_F_TWQ_LAZY_WAKE);
35}
36
37static void io_tx_ubuf_callback_ext(struct sk_buff *skb, struct ubuf_info *uarg,
38			     bool success)
39{
40	struct io_notif_data *nd = container_of(uarg, struct io_notif_data, uarg);
41
42	if (nd->zc_report) {
43		if (success && !nd->zc_used && skb)
44			WRITE_ONCE(nd->zc_used, true);
45		else if (!success && !nd->zc_copied)
46			WRITE_ONCE(nd->zc_copied, true);
47	}
48	io_tx_ubuf_callback(skb, uarg, success);
49}
50
51void io_notif_set_extended(struct io_kiocb *notif)
52{
53	struct io_notif_data *nd = io_notif_to_data(notif);
54
55	if (nd->uarg.callback != io_tx_ubuf_callback_ext) {
56		nd->account_pages = 0;
57		nd->zc_report = false;
58		nd->zc_used = false;
59		nd->zc_copied = false;
60		nd->uarg.callback = io_tx_ubuf_callback_ext;
61		notif->io_task_work.func = io_notif_complete_tw_ext;
62	}
63}
64
65struct io_kiocb *io_alloc_notif(struct io_ring_ctx *ctx)
66	__must_hold(&ctx->uring_lock)
67{
68	struct io_kiocb *notif;
69	struct io_notif_data *nd;
70
71	if (unlikely(!io_alloc_req(ctx, &notif)))
72		return NULL;
73	notif->opcode = IORING_OP_NOP;
74	notif->flags = 0;
75	notif->file = NULL;
76	notif->task = current;
77	io_get_task_refs(1);
78	notif->rsrc_node = NULL;
79	notif->io_task_work.func = io_req_task_complete;
80
81	nd = io_notif_to_data(notif);
82	nd->uarg.flags = IO_NOTIF_UBUF_FLAGS;
83	nd->uarg.callback = io_tx_ubuf_callback;
84	refcount_set(&nd->uarg.refcnt, 1);
85	return notif;
86}
87