158 lines
3.9 KiB
C
158 lines
3.9 KiB
C
#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/file.h>
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#include <linux/slab.h>
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#include <linux/net.h>
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#include <linux/io_uring.h>
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#include "io_uring.h"
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#include "notif.h"
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#include "rsrc.h"
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static void __io_notif_complete_tw(struct io_kiocb *notif, bool *locked)
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{
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struct io_notif_data *nd = io_notif_to_data(notif);
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struct io_ring_ctx *ctx = notif->ctx;
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if (nd->account_pages && ctx->user) {
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__io_unaccount_mem(ctx->user, nd->account_pages);
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nd->account_pages = 0;
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}
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io_req_task_complete(notif, locked);
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}
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static inline void io_notif_complete(struct io_kiocb *notif)
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__must_hold(¬if->ctx->uring_lock)
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{
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bool locked = true;
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__io_notif_complete_tw(notif, &locked);
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}
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static void io_uring_tx_zerocopy_callback(struct sk_buff *skb,
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struct ubuf_info *uarg,
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bool success)
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{
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struct io_notif_data *nd = container_of(uarg, struct io_notif_data, uarg);
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struct io_kiocb *notif = cmd_to_io_kiocb(nd);
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if (refcount_dec_and_test(&uarg->refcnt)) {
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notif->io_task_work.func = __io_notif_complete_tw;
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io_req_task_work_add(notif);
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}
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}
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struct io_kiocb *io_alloc_notif(struct io_ring_ctx *ctx,
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struct io_notif_slot *slot)
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__must_hold(&ctx->uring_lock)
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{
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struct io_kiocb *notif;
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struct io_notif_data *nd;
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if (unlikely(!io_alloc_req_refill(ctx)))
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return NULL;
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notif = io_alloc_req(ctx);
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notif->opcode = IORING_OP_NOP;
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notif->flags = 0;
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notif->file = NULL;
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notif->task = current;
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io_get_task_refs(1);
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notif->rsrc_node = NULL;
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io_req_set_rsrc_node(notif, ctx, 0);
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notif->cqe.user_data = slot->tag;
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notif->cqe.flags = slot->seq++;
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notif->cqe.res = 0;
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nd = io_notif_to_data(notif);
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nd->account_pages = 0;
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nd->uarg.flags = SKBFL_ZEROCOPY_FRAG | SKBFL_DONT_ORPHAN;
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nd->uarg.callback = io_uring_tx_zerocopy_callback;
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/* master ref owned by io_notif_slot, will be dropped on flush */
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refcount_set(&nd->uarg.refcnt, 1);
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return notif;
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}
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void io_notif_slot_flush(struct io_notif_slot *slot)
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__must_hold(&ctx->uring_lock)
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{
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struct io_kiocb *notif = slot->notif;
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struct io_notif_data *nd = io_notif_to_data(notif);
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slot->notif = NULL;
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/* drop slot's master ref */
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if (refcount_dec_and_test(&nd->uarg.refcnt))
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io_notif_complete(notif);
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}
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__cold int io_notif_unregister(struct io_ring_ctx *ctx)
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__must_hold(&ctx->uring_lock)
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{
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int i;
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if (!ctx->notif_slots)
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return -ENXIO;
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for (i = 0; i < ctx->nr_notif_slots; i++) {
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struct io_notif_slot *slot = &ctx->notif_slots[i];
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struct io_kiocb *notif = slot->notif;
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struct io_notif_data *nd;
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if (!notif)
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continue;
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nd = io_notif_to_data(notif);
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slot->notif = NULL;
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if (!refcount_dec_and_test(&nd->uarg.refcnt))
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continue;
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notif->io_task_work.func = __io_notif_complete_tw;
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io_req_task_work_add(notif);
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}
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kvfree(ctx->notif_slots);
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ctx->notif_slots = NULL;
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ctx->nr_notif_slots = 0;
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return 0;
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}
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__cold int io_notif_register(struct io_ring_ctx *ctx,
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void __user *arg, unsigned int size)
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__must_hold(&ctx->uring_lock)
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{
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struct io_uring_notification_slot __user *slots;
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struct io_uring_notification_slot slot;
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struct io_uring_notification_register reg;
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unsigned i;
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if (ctx->nr_notif_slots)
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return -EBUSY;
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if (size != sizeof(reg))
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return -EINVAL;
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if (copy_from_user(®, arg, sizeof(reg)))
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return -EFAULT;
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if (!reg.nr_slots || reg.nr_slots > IORING_MAX_NOTIF_SLOTS)
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return -EINVAL;
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if (reg.resv || reg.resv2 || reg.resv3)
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return -EINVAL;
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slots = u64_to_user_ptr(reg.data);
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ctx->notif_slots = kvcalloc(reg.nr_slots, sizeof(ctx->notif_slots[0]),
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GFP_KERNEL_ACCOUNT);
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if (!ctx->notif_slots)
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return -ENOMEM;
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for (i = 0; i < reg.nr_slots; i++, ctx->nr_notif_slots++) {
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struct io_notif_slot *notif_slot = &ctx->notif_slots[i];
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if (copy_from_user(&slot, &slots[i], sizeof(slot))) {
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io_notif_unregister(ctx);
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return -EFAULT;
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}
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if (slot.resv[0] | slot.resv[1] | slot.resv[2]) {
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io_notif_unregister(ctx);
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return -EINVAL;
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}
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notif_slot->tag = slot.tag;
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}
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return 0;
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}
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