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[2a03:2880:ff:1::face:b00c]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-210bbf464ecsm72098475ad.28.2024.10.29.16.06.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 29 Oct 2024 16:06:09 -0700 (PDT) From: David Wei To: io-uring@vger.kernel.org, netdev@vger.kernel.org Cc: Jens Axboe , Pavel Begunkov , Jakub Kicinski , Paolo Abeni , "David S. Miller" , Eric Dumazet , Jesper Dangaard Brouer , David Ahern , Mina Almasry , Stanislav Fomichev , Joe Damato , Pedro Tammela Subject: [PATCH v7 09/15] io_uring/zcrx: add interface queue and refill queue Date: Tue, 29 Oct 2024 16:05:12 -0700 Message-ID: <20241029230521.2385749-10-dw@davidwei.uk> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20241029230521.2385749-1-dw@davidwei.uk> References: <20241029230521.2385749-1-dw@davidwei.uk> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: David Wei 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. Signed-off-by: David Wei --- Kconfig | 2 + include/linux/io_uring_types.h | 3 + include/uapi/linux/io_uring.h | 43 ++++++++++ io_uring/KConfig | 10 +++ io_uring/Makefile | 1 + io_uring/io_uring.c | 7 ++ io_uring/memmap.c | 8 ++ io_uring/register.c | 7 ++ io_uring/zcrx.c | 143 +++++++++++++++++++++++++++++++++ io_uring/zcrx.h | 39 +++++++++ 10 files changed, 263 insertions(+) create mode 100644 io_uring/KConfig create mode 100644 io_uring/zcrx.c create mode 100644 io_uring/zcrx.h diff --git a/Kconfig b/Kconfig index 745bc773f567..529ea7694ba9 100644 --- a/Kconfig +++ b/Kconfig @@ -30,3 +30,5 @@ source "lib/Kconfig" source "lib/Kconfig.debug" source "Documentation/Kconfig" + +source "io_uring/KConfig" diff --git a/include/linux/io_uring_types.h b/include/linux/io_uring_types.h index 6d3ee71bd832..f0f6d3d186b1 100644 --- a/include/linux/io_uring_types.h +++ b/include/linux/io_uring_types.h @@ -39,6 +39,8 @@ enum io_uring_cmd_flags { IO_URING_F_COMPAT = (1 << 12), }; +struct io_zcrx_ifq; + struct io_wq_work_node { struct io_wq_work_node *next; }; @@ -373,6 +375,7 @@ struct io_ring_ctx { struct io_alloc_cache rsrc_node_cache; struct wait_queue_head rsrc_quiesce_wq; unsigned rsrc_quiesce; + struct io_zcrx_ifq *ifq; u32 pers_next; struct xarray personalities; diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 86cb385fe0b5..d398e19f8eea 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -467,6 +467,8 @@ struct io_uring_cqe { #define IORING_OFF_PBUF_RING 0x80000000ULL #define IORING_OFF_PBUF_SHIFT 16 #define IORING_OFF_MMAP_MASK 0xf8000000ULL +#define IORING_OFF_RQ_RING 0x20000000ULL +#define IORING_OFF_RQ_SHIFT 16 /* * Filled with the offset for mmap(2) @@ -615,6 +617,9 @@ enum io_uring_register_op { /* send MSG_RING without having a ring */ IORING_REGISTER_SEND_MSG_RING = 31, + /* register a netdev hw rx queue for zerocopy */ + IORING_REGISTER_ZCRX_IFQ = 32, + /* this goes last */ IORING_REGISTER_LAST, @@ -845,6 +850,44 @@ enum io_uring_socket_op { SOCKET_URING_OP_SETSOCKOPT, }; +/* Zero copy receive refill queue entry */ +struct io_uring_zcrx_rqe { + __u64 off; + __u32 len; + __u32 __pad; +}; + +struct io_uring_zcrx_cqe { + __u64 off; + __u64 __pad; +}; + +/* The bit from which area id is encoded into offsets */ +#define IORING_ZCRX_AREA_SHIFT 48 +#define IORING_ZCRX_AREA_MASK (~(((__u64)1 << IORING_ZCRX_AREA_SHIFT) - 1)) + +struct io_uring_zcrx_offsets { + __u32 head; + __u32 tail; + __u32 rqes; + __u32 mmap_sz; + __u64 __resv[2]; +}; + +/* + * Argument for IORING_REGISTER_ZCRX_IFQ + */ +struct io_uring_zcrx_ifq_reg { + __u32 if_idx; + __u32 if_rxq; + __u32 rq_entries; + __u32 flags; + + __u64 area_ptr; /* pointer to struct io_uring_zcrx_area_reg */ + struct io_uring_zcrx_offsets offsets; + __u64 __resv[3]; +}; + #ifdef __cplusplus } #endif diff --git a/io_uring/KConfig b/io_uring/KConfig new file mode 100644 index 000000000000..9e2a4beba1ef --- /dev/null +++ b/io_uring/KConfig @@ -0,0 +1,10 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# io_uring configuration +# + +config IO_URING_ZCRX + def_bool y + depends on PAGE_POOL + depends on INET + depends on NET_RX_BUSY_POLL diff --git a/io_uring/Makefile b/io_uring/Makefile index 53167bef37d7..a95b0b8229c9 100644 --- a/io_uring/Makefile +++ b/io_uring/Makefile @@ -14,6 +14,7 @@ obj-$(CONFIG_IO_URING) += io_uring.o opdef.o kbuf.o rsrc.o notif.o \ epoll.o statx.o timeout.o fdinfo.o \ cancel.o waitid.o register.o \ truncate.o memmap.o +obj-$(CONFIG_IO_URING_ZCRX) += zcrx.o obj-$(CONFIG_IO_WQ) += io-wq.o obj-$(CONFIG_FUTEX) += futex.o obj-$(CONFIG_NET_RX_BUSY_POLL) += napi.o diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index 58b401900b41..49d73c793f06 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -98,6 +98,7 @@ #include "uring_cmd.h" #include "msg_ring.h" #include "memmap.h" +#include "zcrx.h" #include "timeout.h" #include "poll.h" @@ -2729,6 +2730,7 @@ static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx) return; mutex_lock(&ctx->uring_lock); + io_unregister_zcrx_ifqs(ctx); if (ctx->buf_data) __io_sqe_buffers_unregister(ctx); if (ctx->file_data) @@ -2903,6 +2905,11 @@ static __cold void io_ring_exit_work(struct work_struct *work) io_cqring_overflow_kill(ctx); mutex_unlock(&ctx->uring_lock); } + if (ctx->ifq) { + mutex_lock(&ctx->uring_lock); + io_shutdown_zcrx_ifqs(ctx); + mutex_unlock(&ctx->uring_lock); + } if (ctx->flags & IORING_SETUP_DEFER_TASKRUN) io_move_task_work_from_local(ctx); diff --git a/io_uring/memmap.c b/io_uring/memmap.c index a0f32a255fd1..4c384e8615f6 100644 --- a/io_uring/memmap.c +++ b/io_uring/memmap.c @@ -12,6 +12,7 @@ #include "memmap.h" #include "kbuf.h" +#include "zcrx.h" static void *io_mem_alloc_compound(struct page **pages, int nr_pages, size_t size, gfp_t gfp) @@ -223,6 +224,10 @@ static void *io_uring_validate_mmap_request(struct file *file, loff_t pgoff, io_put_bl(ctx, bl); return ptr; } + case IORING_OFF_RQ_RING: + if (!ctx->ifq) + return ERR_PTR(-EINVAL); + return ctx->ifq->rq_ring; } return ERR_PTR(-EINVAL); @@ -261,6 +266,9 @@ __cold int io_uring_mmap(struct file *file, struct vm_area_struct *vma) ctx->n_sqe_pages); case IORING_OFF_PBUF_RING: return io_pbuf_mmap(file, vma); + case IORING_OFF_RQ_RING: + return io_uring_mmap_pages(ctx, vma, ctx->ifq->rqe_pages, + ctx->ifq->n_rqe_pages); } return -EINVAL; diff --git a/io_uring/register.c b/io_uring/register.c index 52b2f9b74af8..1fac52b14e3d 100644 --- a/io_uring/register.c +++ b/io_uring/register.c @@ -29,6 +29,7 @@ #include "napi.h" #include "eventfd.h" #include "msg_ring.h" +#include "zcrx.h" #define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \ IORING_REGISTER_LAST + IORING_OP_LAST) @@ -549,6 +550,12 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, break; ret = io_register_clone_buffers(ctx, arg); break; + case IORING_REGISTER_ZCRX_IFQ: + ret = -EINVAL; + if (!arg || nr_args != 1) + break; + ret = io_register_zcrx_ifq(ctx, arg); + break; default: ret = -EINVAL; break; diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c new file mode 100644 index 000000000000..4c53fd4f7bb3 --- /dev/null +++ b/io_uring/zcrx.c @@ -0,0 +1,143 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include + +#include + +#include "io_uring.h" +#include "kbuf.h" +#include "memmap.h" +#include "zcrx.h" + +#define IO_RQ_MAX_ENTRIES 32768 + +static int io_allocate_rbuf_ring(struct io_zcrx_ifq *ifq, + struct io_uring_zcrx_ifq_reg *reg) +{ + size_t off, size; + void *ptr; + + off = sizeof(struct io_uring); + size = off + sizeof(struct io_uring_zcrx_rqe) * reg->rq_entries; + + ptr = io_pages_map(&ifq->rqe_pages, &ifq->n_rqe_pages, size); + if (IS_ERR(ptr)) + return PTR_ERR(ptr); + + ifq->rq_ring = (struct io_uring *)ptr; + ifq->rqes = (struct io_uring_zcrx_rqe *)(ptr + off); + return 0; +} + +static void io_free_rbuf_ring(struct io_zcrx_ifq *ifq) +{ + io_pages_unmap(ifq->rq_ring, &ifq->rqe_pages, &ifq->n_rqe_pages, true); + ifq->rq_ring = NULL; + ifq->rqes = NULL; +} + +static struct io_zcrx_ifq *io_zcrx_ifq_alloc(struct io_ring_ctx *ctx) +{ + struct io_zcrx_ifq *ifq; + + ifq = kzalloc(sizeof(*ifq), GFP_KERNEL); + if (!ifq) + return NULL; + + ifq->if_rxq = -1; + ifq->ctx = ctx; + return ifq; +} + +static void io_zcrx_ifq_free(struct io_zcrx_ifq *ifq) +{ + io_free_rbuf_ring(ifq); + kfree(ifq); +} + +int io_register_zcrx_ifq(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; + size_t ring_sz, rqes_sz; + int ret; + + /* + * 1. Interface queue allocation. + * 2. It can observe data destined for sockets of other tasks. + */ + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + + /* mandatory io_uring features for zc rx */ + if (!(ctx->flags & IORING_SETUP_DEFER_TASKRUN && + ctx->flags & IORING_SETUP_CQE32)) + return -EINVAL; + if (ctx->ifq) + return -EBUSY; + if (copy_from_user(®, arg, sizeof(reg))) + return -EFAULT; + if (reg.__resv[0] || reg.__resv[1] || reg.__resv[2]) + return -EINVAL; + if (reg.if_rxq == -1 || !reg.rq_entries || reg.flags) + return -EINVAL; + if (reg.rq_entries > IO_RQ_MAX_ENTRIES) { + if (!(ctx->flags & IORING_SETUP_CLAMP)) + return -EINVAL; + reg.rq_entries = IO_RQ_MAX_ENTRIES; + } + reg.rq_entries = roundup_pow_of_two(reg.rq_entries); + + if (!reg.area_ptr) + return -EFAULT; + + ifq = io_zcrx_ifq_alloc(ctx); + if (!ifq) + return -ENOMEM; + + ret = io_allocate_rbuf_ring(ifq, ®); + if (ret) + goto err; + + ifq->rq_entries = reg.rq_entries; + ifq->if_rxq = reg.if_rxq; + + ring_sz = sizeof(struct io_uring); + rqes_sz = sizeof(struct io_uring_zcrx_rqe) * ifq->rq_entries; + reg.offsets.mmap_sz = ring_sz + rqes_sz; + reg.offsets.rqes = ring_sz; + reg.offsets.head = offsetof(struct io_uring, head); + reg.offsets.tail = offsetof(struct io_uring, tail); + + if (copy_to_user(arg, ®, sizeof(reg))) { + ret = -EFAULT; + goto err; + } + + ctx->ifq = ifq; + return 0; +err: + io_zcrx_ifq_free(ifq); + return ret; +} + +void io_unregister_zcrx_ifqs(struct io_ring_ctx *ctx) +{ + struct io_zcrx_ifq *ifq = ctx->ifq; + + lockdep_assert_held(&ctx->uring_lock); + + if (!ifq) + return; + + ctx->ifq = NULL; + io_zcrx_ifq_free(ifq); +} + +void io_shutdown_zcrx_ifqs(struct io_ring_ctx *ctx) +{ + lockdep_assert_held(&ctx->uring_lock); +} diff --git a/io_uring/zcrx.h b/io_uring/zcrx.h new file mode 100644 index 000000000000..1f76eecac5fd --- /dev/null +++ b/io_uring/zcrx.h @@ -0,0 +1,39 @@ +// SPDX-License-Identifier: GPL-2.0 +#ifndef IOU_ZC_RX_H +#define IOU_ZC_RX_H + +#include + +struct io_zcrx_ifq { + struct io_ring_ctx *ctx; + struct net_device *dev; + struct io_uring *rq_ring; + struct io_uring_zcrx_rqe *rqes; + u32 rq_entries; + + unsigned short n_rqe_pages; + struct page **rqe_pages; + + 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