585 lines
14 KiB
C
585 lines
14 KiB
C
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/* SPDX-License-Identifier: MIT */
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/* based on linux-kernel/tools/testing/selftests/net/msg_zerocopy.c */
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#include <assert.h>
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#include <errno.h>
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#include <error.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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#include <linux/errqueue.h>
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#include <linux/if_packet.h>
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#include <linux/io_uring.h>
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#include <linux/ipv6.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <net/ethernet.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/ip6.h>
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#include <netinet/tcp.h>
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#include <netinet/udp.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <sys/resource.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/un.h>
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#include <sys/wait.h>
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#define NOTIF_TAG 0xfffffffULL
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#define NONZC_TAG 0
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#define ZC_TAG 1
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enum {
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MODE_NONZC = 0,
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MODE_ZC = 1,
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MODE_ZC_FIXED = 2,
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MODE_MIXED = 3,
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};
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static bool cfg_cork = false;
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static int cfg_mode = MODE_ZC_FIXED;
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static int cfg_nr_reqs = 8;
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static int cfg_family = PF_UNSPEC;
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static int cfg_payload_len;
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static int cfg_port = 8000;
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static int cfg_runtime_ms = 4200;
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static socklen_t cfg_alen;
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static struct sockaddr_storage cfg_dst_addr;
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static char payload[IP_MAXPACKET] __attribute__((aligned(4096)));
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struct io_sq_ring {
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unsigned *head;
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unsigned *tail;
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unsigned *ring_mask;
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unsigned *ring_entries;
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unsigned *flags;
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unsigned *array;
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};
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struct io_cq_ring {
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unsigned *head;
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unsigned *tail;
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unsigned *ring_mask;
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unsigned *ring_entries;
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struct io_uring_cqe *cqes;
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};
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struct io_uring_sq {
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unsigned *khead;
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unsigned *ktail;
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unsigned *kring_mask;
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unsigned *kring_entries;
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unsigned *kflags;
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unsigned *kdropped;
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unsigned *array;
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struct io_uring_sqe *sqes;
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unsigned sqe_head;
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unsigned sqe_tail;
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size_t ring_sz;
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};
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struct io_uring_cq {
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unsigned *khead;
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unsigned *ktail;
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unsigned *kring_mask;
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unsigned *kring_entries;
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unsigned *koverflow;
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struct io_uring_cqe *cqes;
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size_t ring_sz;
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};
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struct io_uring {
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struct io_uring_sq sq;
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struct io_uring_cq cq;
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int ring_fd;
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};
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#ifdef __alpha__
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# ifndef __NR_io_uring_setup
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# define __NR_io_uring_setup 535
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# endif
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# ifndef __NR_io_uring_enter
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# define __NR_io_uring_enter 536
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# endif
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# ifndef __NR_io_uring_register
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# define __NR_io_uring_register 537
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# endif
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#else /* !__alpha__ */
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# ifndef __NR_io_uring_setup
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# define __NR_io_uring_setup 425
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# endif
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# ifndef __NR_io_uring_enter
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# define __NR_io_uring_enter 426
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# endif
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# ifndef __NR_io_uring_register
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# define __NR_io_uring_register 427
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# endif
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#endif
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#if defined(__x86_64) || defined(__i386__)
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#define read_barrier() __asm__ __volatile__("":::"memory")
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#define write_barrier() __asm__ __volatile__("":::"memory")
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#else
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#define read_barrier() __sync_synchronize()
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#define write_barrier() __sync_synchronize()
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#endif
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static int io_uring_setup(unsigned int entries, struct io_uring_params *p)
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{
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return syscall(__NR_io_uring_setup, entries, p);
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}
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static int io_uring_enter(int fd, unsigned int to_submit,
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unsigned int min_complete,
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unsigned int flags, sigset_t *sig)
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{
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return syscall(__NR_io_uring_enter, fd, to_submit, min_complete,
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flags, sig, _NSIG / 8);
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}
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static int io_uring_register_buffers(struct io_uring *ring,
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const struct iovec *iovecs,
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unsigned nr_iovecs)
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{
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int ret;
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ret = syscall(__NR_io_uring_register, ring->ring_fd,
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IORING_REGISTER_BUFFERS, iovecs, nr_iovecs);
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return (ret < 0) ? -errno : ret;
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}
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static int io_uring_mmap(int fd, struct io_uring_params *p,
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struct io_uring_sq *sq, struct io_uring_cq *cq)
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{
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size_t size;
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void *ptr;
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int ret;
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sq->ring_sz = p->sq_off.array + p->sq_entries * sizeof(unsigned);
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ptr = mmap(0, sq->ring_sz, PROT_READ | PROT_WRITE,
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MAP_SHARED | MAP_POPULATE, fd, IORING_OFF_SQ_RING);
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if (ptr == MAP_FAILED)
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return -errno;
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sq->khead = ptr + p->sq_off.head;
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sq->ktail = ptr + p->sq_off.tail;
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sq->kring_mask = ptr + p->sq_off.ring_mask;
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sq->kring_entries = ptr + p->sq_off.ring_entries;
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sq->kflags = ptr + p->sq_off.flags;
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sq->kdropped = ptr + p->sq_off.dropped;
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sq->array = ptr + p->sq_off.array;
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size = p->sq_entries * sizeof(struct io_uring_sqe);
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sq->sqes = mmap(0, size, PROT_READ | PROT_WRITE,
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MAP_SHARED | MAP_POPULATE, fd, IORING_OFF_SQES);
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if (sq->sqes == MAP_FAILED) {
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ret = -errno;
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err:
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munmap(sq->khead, sq->ring_sz);
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return ret;
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}
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cq->ring_sz = p->cq_off.cqes + p->cq_entries * sizeof(struct io_uring_cqe);
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ptr = mmap(0, cq->ring_sz, PROT_READ | PROT_WRITE,
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MAP_SHARED | MAP_POPULATE, fd, IORING_OFF_CQ_RING);
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if (ptr == MAP_FAILED) {
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ret = -errno;
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munmap(sq->sqes, p->sq_entries * sizeof(struct io_uring_sqe));
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goto err;
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}
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cq->khead = ptr + p->cq_off.head;
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cq->ktail = ptr + p->cq_off.tail;
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cq->kring_mask = ptr + p->cq_off.ring_mask;
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cq->kring_entries = ptr + p->cq_off.ring_entries;
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cq->koverflow = ptr + p->cq_off.overflow;
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cq->cqes = ptr + p->cq_off.cqes;
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return 0;
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}
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static int io_uring_queue_init(unsigned entries, struct io_uring *ring,
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unsigned flags)
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{
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struct io_uring_params p;
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int fd, ret;
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memset(ring, 0, sizeof(*ring));
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memset(&p, 0, sizeof(p));
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p.flags = flags;
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fd = io_uring_setup(entries, &p);
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if (fd < 0)
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return fd;
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ret = io_uring_mmap(fd, &p, &ring->sq, &ring->cq);
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if (!ret)
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ring->ring_fd = fd;
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else
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close(fd);
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return ret;
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}
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static int io_uring_submit(struct io_uring *ring)
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{
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struct io_uring_sq *sq = &ring->sq;
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const unsigned mask = *sq->kring_mask;
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unsigned ktail, submitted, to_submit;
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int ret;
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read_barrier();
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if (*sq->khead != *sq->ktail) {
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submitted = *sq->kring_entries;
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goto submit;
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}
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if (sq->sqe_head == sq->sqe_tail)
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return 0;
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ktail = *sq->ktail;
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to_submit = sq->sqe_tail - sq->sqe_head;
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for (submitted = 0; submitted < to_submit; submitted++) {
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read_barrier();
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sq->array[ktail++ & mask] = sq->sqe_head++ & mask;
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}
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if (!submitted)
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return 0;
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if (*sq->ktail != ktail) {
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write_barrier();
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*sq->ktail = ktail;
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write_barrier();
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}
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submit:
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ret = io_uring_enter(ring->ring_fd, submitted, 0,
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IORING_ENTER_GETEVENTS, NULL);
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return ret < 0 ? -errno : ret;
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}
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static inline void io_uring_prep_send(struct io_uring_sqe *sqe, int sockfd,
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const void *buf, size_t len, int flags)
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{
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memset(sqe, 0, sizeof(*sqe));
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sqe->opcode = (__u8) IORING_OP_SEND;
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sqe->fd = sockfd;
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sqe->addr = (unsigned long) buf;
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sqe->len = len;
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sqe->msg_flags = (__u32) flags;
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}
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static inline void io_uring_prep_sendzc(struct io_uring_sqe *sqe, int sockfd,
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const void *buf, size_t len, int flags,
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unsigned zc_flags)
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{
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io_uring_prep_send(sqe, sockfd, buf, len, flags);
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sqe->opcode = (__u8) IORING_OP_SEND_ZC;
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sqe->ioprio = zc_flags;
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}
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static struct io_uring_sqe *io_uring_get_sqe(struct io_uring *ring)
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{
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struct io_uring_sq *sq = &ring->sq;
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if (sq->sqe_tail + 1 - sq->sqe_head > *sq->kring_entries)
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return NULL;
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return &sq->sqes[sq->sqe_tail++ & *sq->kring_mask];
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}
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static int io_uring_wait_cqe(struct io_uring *ring, struct io_uring_cqe **cqe_ptr)
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{
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struct io_uring_cq *cq = &ring->cq;
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const unsigned mask = *cq->kring_mask;
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unsigned head = *cq->khead;
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int ret;
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*cqe_ptr = NULL;
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do {
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read_barrier();
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if (head != *cq->ktail) {
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*cqe_ptr = &cq->cqes[head & mask];
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break;
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}
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ret = io_uring_enter(ring->ring_fd, 0, 1,
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IORING_ENTER_GETEVENTS, NULL);
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if (ret < 0)
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return -errno;
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} while (1);
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return 0;
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}
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static inline void io_uring_cqe_seen(struct io_uring *ring)
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{
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*(&ring->cq)->khead += 1;
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write_barrier();
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}
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static unsigned long gettimeofday_ms(void)
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
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}
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static void do_setsockopt(int fd, int level, int optname, int val)
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{
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if (setsockopt(fd, level, optname, &val, sizeof(val)))
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error(1, errno, "setsockopt %d.%d: %d", level, optname, val);
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}
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static int do_setup_tx(int domain, int type, int protocol)
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{
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int fd;
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fd = socket(domain, type, protocol);
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if (fd == -1)
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error(1, errno, "socket t");
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do_setsockopt(fd, SOL_SOCKET, SO_SNDBUF, 1 << 21);
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if (connect(fd, (void *) &cfg_dst_addr, cfg_alen))
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error(1, errno, "connect");
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return fd;
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}
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static void do_tx(int domain, int type, int protocol)
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{
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struct io_uring_sqe *sqe;
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struct io_uring_cqe *cqe;
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unsigned long packets = 0, bytes = 0;
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struct io_uring ring;
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struct iovec iov;
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uint64_t tstop;
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int i, fd, ret;
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int compl_cqes = 0;
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fd = do_setup_tx(domain, type, protocol);
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ret = io_uring_queue_init(512, &ring, 0);
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if (ret)
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||
|
|
error(1, ret, "io_uring: queue init");
|
||
|
|
|
||
|
|
iov.iov_base = payload;
|
||
|
|
iov.iov_len = cfg_payload_len;
|
||
|
|
|
||
|
|
ret = io_uring_register_buffers(&ring, &iov, 1);
|
||
|
|
if (ret)
|
||
|
|
error(1, ret, "io_uring: buffer registration");
|
||
|
|
|
||
|
|
tstop = gettimeofday_ms() + cfg_runtime_ms;
|
||
|
|
do {
|
||
|
|
if (cfg_cork)
|
||
|
|
do_setsockopt(fd, IPPROTO_UDP, UDP_CORK, 1);
|
||
|
|
|
||
|
|
for (i = 0; i < cfg_nr_reqs; i++) {
|
||
|
|
unsigned zc_flags = 0;
|
||
|
|
unsigned buf_idx = 0;
|
||
|
|
unsigned mode = cfg_mode;
|
||
|
|
unsigned msg_flags = MSG_WAITALL;
|
||
|
|
|
||
|
|
if (cfg_mode == MODE_MIXED)
|
||
|
|
mode = rand() % 3;
|
||
|
|
|
||
|
|
sqe = io_uring_get_sqe(&ring);
|
||
|
|
|
||
|
|
if (mode == MODE_NONZC) {
|
||
|
|
io_uring_prep_send(sqe, fd, payload,
|
||
|
|
cfg_payload_len, msg_flags);
|
||
|
|
sqe->user_data = NONZC_TAG;
|
||
|
|
} else {
|
||
|
|
io_uring_prep_sendzc(sqe, fd, payload,
|
||
|
|
cfg_payload_len,
|
||
|
|
msg_flags, zc_flags);
|
||
|
|
if (mode == MODE_ZC_FIXED) {
|
||
|
|
sqe->ioprio |= IORING_RECVSEND_FIXED_BUF;
|
||
|
|
sqe->buf_index = buf_idx;
|
||
|
|
}
|
||
|
|
sqe->user_data = ZC_TAG;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = io_uring_submit(&ring);
|
||
|
|
if (ret != cfg_nr_reqs)
|
||
|
|
error(1, ret, "submit");
|
||
|
|
|
||
|
|
if (cfg_cork)
|
||
|
|
do_setsockopt(fd, IPPROTO_UDP, UDP_CORK, 0);
|
||
|
|
for (i = 0; i < cfg_nr_reqs; i++) {
|
||
|
|
ret = io_uring_wait_cqe(&ring, &cqe);
|
||
|
|
if (ret)
|
||
|
|
error(1, ret, "wait cqe");
|
||
|
|
|
||
|
|
if (cqe->user_data != NONZC_TAG &&
|
||
|
|
cqe->user_data != ZC_TAG)
|
||
|
|
error(1, -EINVAL, "invalid cqe->user_data");
|
||
|
|
|
||
|
|
if (cqe->flags & IORING_CQE_F_NOTIF) {
|
||
|
|
if (cqe->flags & IORING_CQE_F_MORE)
|
||
|
|
error(1, -EINVAL, "invalid notif flags");
|
||
|
|
if (compl_cqes <= 0)
|
||
|
|
error(1, -EINVAL, "notification mismatch");
|
||
|
|
compl_cqes--;
|
||
|
|
i--;
|
||
|
|
io_uring_cqe_seen(&ring);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
if (cqe->flags & IORING_CQE_F_MORE) {
|
||
|
|
if (cqe->user_data != ZC_TAG)
|
||
|
|
error(1, cqe->res, "unexpected F_MORE");
|
||
|
|
compl_cqes++;
|
||
|
|
}
|
||
|
|
if (cqe->res >= 0) {
|
||
|
|
packets++;
|
||
|
|
bytes += cqe->res;
|
||
|
|
} else if (cqe->res != -EAGAIN) {
|
||
|
|
error(1, cqe->res, "send failed");
|
||
|
|
}
|
||
|
|
io_uring_cqe_seen(&ring);
|
||
|
|
}
|
||
|
|
} while (gettimeofday_ms() < tstop);
|
||
|
|
|
||
|
|
while (compl_cqes) {
|
||
|
|
ret = io_uring_wait_cqe(&ring, &cqe);
|
||
|
|
if (ret)
|
||
|
|
error(1, ret, "wait cqe");
|
||
|
|
if (cqe->flags & IORING_CQE_F_MORE)
|
||
|
|
error(1, -EINVAL, "invalid notif flags");
|
||
|
|
if (!(cqe->flags & IORING_CQE_F_NOTIF))
|
||
|
|
error(1, -EINVAL, "missing notif flag");
|
||
|
|
|
||
|
|
io_uring_cqe_seen(&ring);
|
||
|
|
compl_cqes--;
|
||
|
|
}
|
||
|
|
|
||
|
|
fprintf(stderr, "tx=%lu (MB=%lu), tx/s=%lu (MB/s=%lu)\n",
|
||
|
|
packets, bytes >> 20,
|
||
|
|
packets / (cfg_runtime_ms / 1000),
|
||
|
|
(bytes >> 20) / (cfg_runtime_ms / 1000));
|
||
|
|
|
||
|
|
if (close(fd))
|
||
|
|
error(1, errno, "close");
|
||
|
|
}
|
||
|
|
|
||
|
|
static void do_test(int domain, int type, int protocol)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = 0; i < IP_MAXPACKET; i++)
|
||
|
|
payload[i] = 'a' + (i % 26);
|
||
|
|
do_tx(domain, type, protocol);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void usage(const char *filepath)
|
||
|
|
{
|
||
|
|
error(1, 0, "Usage: %s (-4|-6) (udp|tcp) -D<dst_ip> [-s<payload size>] "
|
||
|
|
"[-t<time s>] [-n<batch>] [-p<port>] [-m<mode>]", filepath);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void parse_opts(int argc, char **argv)
|
||
|
|
{
|
||
|
|
const int max_payload_len = sizeof(payload) -
|
||
|
|
sizeof(struct ipv6hdr) -
|
||
|
|
sizeof(struct tcphdr) -
|
||
|
|
40 /* max tcp options */;
|
||
|
|
struct sockaddr_in6 *addr6 = (void *) &cfg_dst_addr;
|
||
|
|
struct sockaddr_in *addr4 = (void *) &cfg_dst_addr;
|
||
|
|
char *daddr = NULL;
|
||
|
|
int c;
|
||
|
|
|
||
|
|
if (argc <= 1)
|
||
|
|
usage(argv[0]);
|
||
|
|
cfg_payload_len = max_payload_len;
|
||
|
|
|
||
|
|
while ((c = getopt(argc, argv, "46D:p:s:t:n:c:m:")) != -1) {
|
||
|
|
switch (c) {
|
||
|
|
case '4':
|
||
|
|
if (cfg_family != PF_UNSPEC)
|
||
|
|
error(1, 0, "Pass one of -4 or -6");
|
||
|
|
cfg_family = PF_INET;
|
||
|
|
cfg_alen = sizeof(struct sockaddr_in);
|
||
|
|
break;
|
||
|
|
case '6':
|
||
|
|
if (cfg_family != PF_UNSPEC)
|
||
|
|
error(1, 0, "Pass one of -4 or -6");
|
||
|
|
cfg_family = PF_INET6;
|
||
|
|
cfg_alen = sizeof(struct sockaddr_in6);
|
||
|
|
break;
|
||
|
|
case 'D':
|
||
|
|
daddr = optarg;
|
||
|
|
break;
|
||
|
|
case 'p':
|
||
|
|
cfg_port = strtoul(optarg, NULL, 0);
|
||
|
|
break;
|
||
|
|
case 's':
|
||
|
|
cfg_payload_len = strtoul(optarg, NULL, 0);
|
||
|
|
break;
|
||
|
|
case 't':
|
||
|
|
cfg_runtime_ms = 200 + strtoul(optarg, NULL, 10) * 1000;
|
||
|
|
break;
|
||
|
|
case 'n':
|
||
|
|
cfg_nr_reqs = strtoul(optarg, NULL, 0);
|
||
|
|
break;
|
||
|
|
case 'c':
|
||
|
|
cfg_cork = strtol(optarg, NULL, 0);
|
||
|
|
break;
|
||
|
|
case 'm':
|
||
|
|
cfg_mode = strtol(optarg, NULL, 0);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
switch (cfg_family) {
|
||
|
|
case PF_INET:
|
||
|
|
memset(addr4, 0, sizeof(*addr4));
|
||
|
|
addr4->sin_family = AF_INET;
|
||
|
|
addr4->sin_port = htons(cfg_port);
|
||
|
|
if (daddr &&
|
||
|
|
inet_pton(AF_INET, daddr, &(addr4->sin_addr)) != 1)
|
||
|
|
error(1, 0, "ipv4 parse error: %s", daddr);
|
||
|
|
break;
|
||
|
|
case PF_INET6:
|
||
|
|
memset(addr6, 0, sizeof(*addr6));
|
||
|
|
addr6->sin6_family = AF_INET6;
|
||
|
|
addr6->sin6_port = htons(cfg_port);
|
||
|
|
if (daddr &&
|
||
|
|
inet_pton(AF_INET6, daddr, &(addr6->sin6_addr)) != 1)
|
||
|
|
error(1, 0, "ipv6 parse error: %s", daddr);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
error(1, 0, "illegal domain");
|
||
|
|
}
|
||
|
|
|
||
|
|
if (cfg_payload_len > max_payload_len)
|
||
|
|
error(1, 0, "-s: payload exceeds max (%d)", max_payload_len);
|
||
|
|
if (optind != argc - 1)
|
||
|
|
usage(argv[0]);
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char **argv)
|
||
|
|
{
|
||
|
|
const char *cfg_test = argv[argc - 1];
|
||
|
|
|
||
|
|
parse_opts(argc, argv);
|
||
|
|
|
||
|
|
if (!strcmp(cfg_test, "tcp"))
|
||
|
|
do_test(cfg_family, SOCK_STREAM, 0);
|
||
|
|
else if (!strcmp(cfg_test, "udp"))
|
||
|
|
do_test(cfg_family, SOCK_DGRAM, 0);
|
||
|
|
else
|
||
|
|
error(1, 0, "unknown cfg_test %s", cfg_test);
|
||
|
|
return 0;
|
||
|
|
}
|