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(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->account_pages && ctx->user) { 18 __io_unaccount_mem(ctx->user, nd->account_pages); 19 nd->account_pages = 0; 20 } 21 io_req_task_complete(notif, locked); 22 } 23 24 static void io_uring_tx_zerocopy_callback(struct sk_buff *skb, 25 struct ubuf_info *uarg, 26 bool success) 27 { 28 struct io_notif_data *nd = container_of(uarg, struct io_notif_data, uarg); 29 struct io_kiocb *notif = cmd_to_io_kiocb(nd); 30 31 if (refcount_dec_and_test(&uarg->refcnt)) { 32 notif->io_task_work.func = __io_notif_complete_tw; 33 io_req_task_work_add(notif); 34 } 35 } 36 37 struct io_kiocb *io_alloc_notif(struct io_ring_ctx *ctx) 38 __must_hold(&ctx->uring_lock) 39 { 40 struct io_kiocb *notif; 41 struct io_notif_data *nd; 42 43 if (unlikely(!io_alloc_req_refill(ctx))) 44 return NULL; 45 notif = io_alloc_req(ctx); 46 notif->opcode = IORING_OP_NOP; 47 notif->flags = 0; 48 notif->file = NULL; 49 notif->task = current; 50 io_get_task_refs(1); 51 notif->rsrc_node = NULL; 52 io_req_set_rsrc_node(notif, ctx, 0); 53 54 nd = io_notif_to_data(notif); 55 nd->account_pages = 0; 56 nd->uarg.flags = SKBFL_ZEROCOPY_FRAG | SKBFL_DONT_ORPHAN; 57 nd->uarg.callback = io_uring_tx_zerocopy_callback; 58 refcount_set(&nd->uarg.refcnt, 1); 59 return notif; 60 } 61 62 void io_notif_flush(struct io_kiocb *notif) 63 __must_hold(&slot->notif->ctx->uring_lock) 64 { 65 struct io_notif_data *nd = io_notif_to_data(notif); 66 67 /* drop slot's master ref */ 68 if (refcount_dec_and_test(&nd->uarg.refcnt)) { 69 notif->io_task_work.func = __io_notif_complete_tw; 70 io_req_task_work_add(notif); 71 } 72 } 73