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io_uring/zcrx: share an ifq between rings

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Add a way to share an ifq from a src ring that is real (i.e. bound to a
HW RX queue) with other rings. This is done by passing a new flag
IORING_ZCRX_IFQ_REG_IMPORT in the registration struct
io_uring_zcrx_ifq_reg, alongside the fd of an exported zcrx ifq.

Signed-off-by: David Wei <dw@davidwei.uk>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
David Wei
2025-11-13 10:46:18 +00:00
committed by Jens Axboe
parent 0926f94ab3
commit 00d9148127
2 changed files with 65 additions and 2 deletions
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4
include/uapi/linux/io_uring.h
View File

@@ -1063,6 +1063,10 @@ struct io_uring_zcrx_area_reg {
__u64 __resv2[2];
};
enum zcrx_reg_flags {
ZCRX_REG_IMPORT = 1,
};
/*
* Argument for IORING_REGISTER_ZCRX_IFQ
*/

63
io_uring/zcrx.c
View File

@@ -660,6 +660,63 @@ static int zcrx_export(struct io_ring_ctx *ctx, struct io_zcrx_ifq *ifq,
return 0;
}
static int import_zcrx(struct io_ring_ctx *ctx,
struct io_uring_zcrx_ifq_reg __user *arg,
struct io_uring_zcrx_ifq_reg *reg)
{
struct io_zcrx_ifq *ifq;
struct file *file;
int fd, ret;
u32 id;
if (!(ctx->flags & IORING_SETUP_DEFER_TASKRUN))
return -EINVAL;
if (!(ctx->flags & (IORING_SETUP_CQE32|IORING_SETUP_CQE_MIXED)))
return -EINVAL;
if (reg->if_rxq || reg->rq_entries || reg->area_ptr || reg->region_ptr)
return -EINVAL;
fd = reg->if_idx;
CLASS(fd, f)(fd);
if (fd_empty(f))
return -EBADF;
file = fd_file(f);
if (file->f_op != &zcrx_box_fops || !file->private_data)
return -EBADF;
ifq = file->private_data;
refcount_inc(&ifq->refs);
refcount_inc(&ifq->user_refs);
scoped_guard(mutex, &ctx->mmap_lock) {
ret = xa_alloc(&ctx->zcrx_ctxs, &id, NULL, xa_limit_31b, GFP_KERNEL);
if (ret)
goto err;
}
reg->zcrx_id = id;
io_fill_zcrx_offsets(&reg->offsets);
if (copy_to_user(arg, reg, sizeof(*reg))) {
ret = -EFAULT;
goto err_xa_erase;
}
scoped_guard(mutex, &ctx->mmap_lock) {
ret = -ENOMEM;
if (xa_store(&ctx->zcrx_ctxs, id, ifq, GFP_KERNEL))
goto err_xa_erase;
}
return 0;
err_xa_erase:
scoped_guard(mutex, &ctx->mmap_lock)
xa_erase(&ctx->zcrx_ctxs, id);
err:
zcrx_unregister(ifq);
return ret;
}
int io_register_zcrx_ifq(struct io_ring_ctx *ctx,
struct io_uring_zcrx_ifq_reg __user *arg)
{
@@ -685,11 +742,13 @@ int io_register_zcrx_ifq(struct io_ring_ctx *ctx,
return -EINVAL;
if (copy_from_user(&reg, arg, sizeof(reg)))
return -EFAULT;
if (copy_from_user(&rd, u64_to_user_ptr(reg.region_ptr), sizeof(rd)))
return -EFAULT;
if (!mem_is_zero(&reg.__resv, sizeof(reg.__resv)) ||
reg.__resv2 || reg.zcrx_id)
return -EINVAL;
if (reg.flags & ZCRX_REG_IMPORT)
return import_zcrx(ctx, arg, &reg);
if (copy_from_user(&rd, u64_to_user_ptr(reg.region_ptr), sizeof(rd)))
return -EFAULT;
if (reg.if_rxq == -1 || !reg.rq_entries || reg.flags)
return -EINVAL;
if (reg.rq_entries > IO_RQ_MAX_ENTRIES) {