mirror of
git://git.yoctoproject.org/linux-yocto.git
synced 2025-10-22 15:03:53 +02:00
6f377873cb
Add a new object called an interface queue (ifq) that represents a net rx queue that has been configured for zero copy. Each ifq is registered using a new registration opcode IORING_REGISTER_ZCRX_IFQ. The refill queue is allocated by the kernel and mapped by userspace using a new offset IORING_OFF_RQ_RING, in a similar fashion to the main SQ/CQ. It is used by userspace to return buffers that it is done with, which will then be re-used by the netdev again. The main CQ ring is used to notify userspace of received data by using the upper 16 bytes of a big CQE as a new struct io_uring_zcrx_cqe. Each entry contains the offset + len to the data. For now, each io_uring instance only has a single ifq. Reviewed-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: David Wei <dw@davidwei.uk> Acked-by: Jakub Kicinski <kuba@kernel.org> Link: https://lore.kernel.org/r/20250215000947.789731-2-dw@davidwei.uk Signed-off-by: Jens Axboe <axboe@kernel.dk>
36 lines
801 B
C
36 lines
801 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
#ifndef IOU_ZC_RX_H
|
|
#define IOU_ZC_RX_H
|
|
|
|
#include <linux/io_uring_types.h>
|
|
|
|
struct io_zcrx_ifq {
|
|
struct io_ring_ctx *ctx;
|
|
struct io_uring *rq_ring;
|
|
struct io_uring_zcrx_rqe *rqes;
|
|
u32 rq_entries;
|
|
|
|
u32 if_rxq;
|
|
};
|
|
|
|
#if defined(CONFIG_IO_URING_ZCRX)
|
|
int io_register_zcrx_ifq(struct io_ring_ctx *ctx,
|
|
struct io_uring_zcrx_ifq_reg __user *arg);
|
|
void io_unregister_zcrx_ifqs(struct io_ring_ctx *ctx);
|
|
void io_shutdown_zcrx_ifqs(struct io_ring_ctx *ctx);
|
|
#else
|
|
static inline int io_register_zcrx_ifq(struct io_ring_ctx *ctx,
|
|
struct io_uring_zcrx_ifq_reg __user *arg)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
static inline void io_unregister_zcrx_ifqs(struct io_ring_ctx *ctx)
|
|
{
|
|
}
|
|
static inline void io_shutdown_zcrx_ifqs(struct io_ring_ctx *ctx)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#endif
|