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(user: ctx->user, nr_pages: nd->account_pages);
22 nd->account_pages = 0;
23 }
24 io_req_task_complete(req: 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(r: &uarg->refcnt))
34 __io_req_task_work_add(req: notif, flags: 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(nr: 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(r: &nd->uarg.refcnt, n: 1);
85 return notif;
86}
87

source code of linux/io_uring/notif.c