io_uring/notif.c

   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
  12 static void io_notif_complete_tw_ext(struct io_kiocb *notif, bool *locked)
  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, locked);
  25 }
  26
  27 static 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);
  35 }
  36
  37 static 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
  51 void 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
  65 struct 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_refill(ctx)))
  72                 return NULL;
  73         notif = io_alloc_req(ctx);
  74         notif->opcode = IORING_OP_NOP;
  75         notif->flags = 0;
  76         notif->file = NULL;
  77         notif->task = current;
  78         io_get_task_refs(1);
  79         notif->rsrc_node = NULL;
  80         notif->io_task_work.func = io_req_task_complete;
  81
  82         nd = io_notif_to_data(notif);
  83         nd->uarg.flags = SKBFL_ZEROCOPY_FRAG | SKBFL_DONT_ORPHAN;
  84         nd->uarg.callback = io_tx_ubuf_callback;
  85         refcount_set(&nd->uarg.refcnt, 1);
  86         return notif;
  87 }