| // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) |
| |
| /* |
| * AF_XDP user-space access library. |
| * |
| * Copyright(c) 2018 - 2019 Intel Corporation. |
| * |
| * Author(s): Magnus Karlsson <magnus.karlsson@intel.com> |
| */ |
| |
| #include <errno.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <arpa/inet.h> |
| #include <asm/barrier.h> |
| #include <linux/compiler.h> |
| #include <linux/ethtool.h> |
| #include <linux/filter.h> |
| #include <linux/if_ether.h> |
| #include <linux/if_packet.h> |
| #include <linux/if_xdp.h> |
| #include <linux/sockios.h> |
| #include <net/if.h> |
| #include <sys/ioctl.h> |
| #include <sys/mman.h> |
| #include <sys/socket.h> |
| #include <sys/types.h> |
| |
| #include "bpf.h" |
| #include "libbpf.h" |
| #include "libbpf_internal.h" |
| #include "xsk.h" |
| |
| #ifndef SOL_XDP |
| #define SOL_XDP 283 |
| #endif |
| |
| #ifndef AF_XDP |
| #define AF_XDP 44 |
| #endif |
| |
| #ifndef PF_XDP |
| #define PF_XDP AF_XDP |
| #endif |
| |
| struct xsk_umem { |
| struct xsk_ring_prod *fill; |
| struct xsk_ring_cons *comp; |
| char *umem_area; |
| struct xsk_umem_config config; |
| int fd; |
| int refcount; |
| }; |
| |
| struct xsk_socket { |
| struct xsk_ring_cons *rx; |
| struct xsk_ring_prod *tx; |
| __u64 outstanding_tx; |
| struct xsk_umem *umem; |
| struct xsk_socket_config config; |
| int fd; |
| int ifindex; |
| int prog_fd; |
| int xsks_map_fd; |
| __u32 queue_id; |
| char ifname[IFNAMSIZ]; |
| }; |
| |
| struct xsk_nl_info { |
| bool xdp_prog_attached; |
| int ifindex; |
| int fd; |
| }; |
| |
| /* Up until and including Linux 5.3 */ |
| struct xdp_ring_offset_v1 { |
| __u64 producer; |
| __u64 consumer; |
| __u64 desc; |
| }; |
| |
| /* Up until and including Linux 5.3 */ |
| struct xdp_mmap_offsets_v1 { |
| struct xdp_ring_offset_v1 rx; |
| struct xdp_ring_offset_v1 tx; |
| struct xdp_ring_offset_v1 fr; |
| struct xdp_ring_offset_v1 cr; |
| }; |
| |
| int xsk_umem__fd(const struct xsk_umem *umem) |
| { |
| return umem ? umem->fd : -EINVAL; |
| } |
| |
| int xsk_socket__fd(const struct xsk_socket *xsk) |
| { |
| return xsk ? xsk->fd : -EINVAL; |
| } |
| |
| static bool xsk_page_aligned(void *buffer) |
| { |
| unsigned long addr = (unsigned long)buffer; |
| |
| return !(addr & (getpagesize() - 1)); |
| } |
| |
| static void xsk_set_umem_config(struct xsk_umem_config *cfg, |
| const struct xsk_umem_config *usr_cfg) |
| { |
| if (!usr_cfg) { |
| cfg->fill_size = XSK_RING_PROD__DEFAULT_NUM_DESCS; |
| cfg->comp_size = XSK_RING_CONS__DEFAULT_NUM_DESCS; |
| cfg->frame_size = XSK_UMEM__DEFAULT_FRAME_SIZE; |
| cfg->frame_headroom = XSK_UMEM__DEFAULT_FRAME_HEADROOM; |
| cfg->flags = XSK_UMEM__DEFAULT_FLAGS; |
| return; |
| } |
| |
| cfg->fill_size = usr_cfg->fill_size; |
| cfg->comp_size = usr_cfg->comp_size; |
| cfg->frame_size = usr_cfg->frame_size; |
| cfg->frame_headroom = usr_cfg->frame_headroom; |
| cfg->flags = usr_cfg->flags; |
| } |
| |
| static int xsk_set_xdp_socket_config(struct xsk_socket_config *cfg, |
| const struct xsk_socket_config *usr_cfg) |
| { |
| if (!usr_cfg) { |
| cfg->rx_size = XSK_RING_CONS__DEFAULT_NUM_DESCS; |
| cfg->tx_size = XSK_RING_PROD__DEFAULT_NUM_DESCS; |
| cfg->libbpf_flags = 0; |
| cfg->xdp_flags = 0; |
| cfg->bind_flags = 0; |
| return 0; |
| } |
| |
| if (usr_cfg->libbpf_flags & ~XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD) |
| return -EINVAL; |
| |
| cfg->rx_size = usr_cfg->rx_size; |
| cfg->tx_size = usr_cfg->tx_size; |
| cfg->libbpf_flags = usr_cfg->libbpf_flags; |
| cfg->xdp_flags = usr_cfg->xdp_flags; |
| cfg->bind_flags = usr_cfg->bind_flags; |
| |
| return 0; |
| } |
| |
| static void xsk_mmap_offsets_v1(struct xdp_mmap_offsets *off) |
| { |
| struct xdp_mmap_offsets_v1 off_v1; |
| |
| /* getsockopt on a kernel <= 5.3 has no flags fields. |
| * Copy over the offsets to the correct places in the >=5.4 format |
| * and put the flags where they would have been on that kernel. |
| */ |
| memcpy(&off_v1, off, sizeof(off_v1)); |
| |
| off->rx.producer = off_v1.rx.producer; |
| off->rx.consumer = off_v1.rx.consumer; |
| off->rx.desc = off_v1.rx.desc; |
| off->rx.flags = off_v1.rx.consumer + sizeof(__u32); |
| |
| off->tx.producer = off_v1.tx.producer; |
| off->tx.consumer = off_v1.tx.consumer; |
| off->tx.desc = off_v1.tx.desc; |
| off->tx.flags = off_v1.tx.consumer + sizeof(__u32); |
| |
| off->fr.producer = off_v1.fr.producer; |
| off->fr.consumer = off_v1.fr.consumer; |
| off->fr.desc = off_v1.fr.desc; |
| off->fr.flags = off_v1.fr.consumer + sizeof(__u32); |
| |
| off->cr.producer = off_v1.cr.producer; |
| off->cr.consumer = off_v1.cr.consumer; |
| off->cr.desc = off_v1.cr.desc; |
| off->cr.flags = off_v1.cr.consumer + sizeof(__u32); |
| } |
| |
| static int xsk_get_mmap_offsets(int fd, struct xdp_mmap_offsets *off) |
| { |
| socklen_t optlen; |
| int err; |
| |
| optlen = sizeof(*off); |
| err = getsockopt(fd, SOL_XDP, XDP_MMAP_OFFSETS, off, &optlen); |
| if (err) |
| return err; |
| |
| if (optlen == sizeof(*off)) |
| return 0; |
| |
| if (optlen == sizeof(struct xdp_mmap_offsets_v1)) { |
| xsk_mmap_offsets_v1(off); |
| return 0; |
| } |
| |
| return -EINVAL; |
| } |
| |
| int xsk_umem__create_v0_0_4(struct xsk_umem **umem_ptr, void *umem_area, |
| __u64 size, struct xsk_ring_prod *fill, |
| struct xsk_ring_cons *comp, |
| const struct xsk_umem_config *usr_config) |
| { |
| struct xdp_mmap_offsets off; |
| struct xdp_umem_reg mr; |
| struct xsk_umem *umem; |
| void *map; |
| int err; |
| |
| if (!umem_area || !umem_ptr || !fill || !comp) |
| return -EFAULT; |
| if (!size && !xsk_page_aligned(umem_area)) |
| return -EINVAL; |
| |
| umem = calloc(1, sizeof(*umem)); |
| if (!umem) |
| return -ENOMEM; |
| |
| umem->fd = socket(AF_XDP, SOCK_RAW, 0); |
| if (umem->fd < 0) { |
| err = -errno; |
| goto out_umem_alloc; |
| } |
| |
| umem->umem_area = umem_area; |
| xsk_set_umem_config(&umem->config, usr_config); |
| |
| memset(&mr, 0, sizeof(mr)); |
| mr.addr = (uintptr_t)umem_area; |
| mr.len = size; |
| mr.chunk_size = umem->config.frame_size; |
| mr.headroom = umem->config.frame_headroom; |
| mr.flags = umem->config.flags; |
| |
| err = setsockopt(umem->fd, SOL_XDP, XDP_UMEM_REG, &mr, sizeof(mr)); |
| if (err) { |
| err = -errno; |
| goto out_socket; |
| } |
| err = setsockopt(umem->fd, SOL_XDP, XDP_UMEM_FILL_RING, |
| &umem->config.fill_size, |
| sizeof(umem->config.fill_size)); |
| if (err) { |
| err = -errno; |
| goto out_socket; |
| } |
| err = setsockopt(umem->fd, SOL_XDP, XDP_UMEM_COMPLETION_RING, |
| &umem->config.comp_size, |
| sizeof(umem->config.comp_size)); |
| if (err) { |
| err = -errno; |
| goto out_socket; |
| } |
| |
| err = xsk_get_mmap_offsets(umem->fd, &off); |
| if (err) { |
| err = -errno; |
| goto out_socket; |
| } |
| |
| map = mmap(NULL, off.fr.desc + umem->config.fill_size * sizeof(__u64), |
| PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, umem->fd, |
| XDP_UMEM_PGOFF_FILL_RING); |
| if (map == MAP_FAILED) { |
| err = -errno; |
| goto out_socket; |
| } |
| |
| umem->fill = fill; |
| fill->mask = umem->config.fill_size - 1; |
| fill->size = umem->config.fill_size; |
| fill->producer = map + off.fr.producer; |
| fill->consumer = map + off.fr.consumer; |
| fill->flags = map + off.fr.flags; |
| fill->ring = map + off.fr.desc; |
| fill->cached_cons = umem->config.fill_size; |
| |
| map = mmap(NULL, off.cr.desc + umem->config.comp_size * sizeof(__u64), |
| PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, umem->fd, |
| XDP_UMEM_PGOFF_COMPLETION_RING); |
| if (map == MAP_FAILED) { |
| err = -errno; |
| goto out_mmap; |
| } |
| |
| umem->comp = comp; |
| comp->mask = umem->config.comp_size - 1; |
| comp->size = umem->config.comp_size; |
| comp->producer = map + off.cr.producer; |
| comp->consumer = map + off.cr.consumer; |
| comp->flags = map + off.cr.flags; |
| comp->ring = map + off.cr.desc; |
| |
| *umem_ptr = umem; |
| return 0; |
| |
| out_mmap: |
| munmap(map, off.fr.desc + umem->config.fill_size * sizeof(__u64)); |
| out_socket: |
| close(umem->fd); |
| out_umem_alloc: |
| free(umem); |
| return err; |
| } |
| |
| struct xsk_umem_config_v1 { |
| __u32 fill_size; |
| __u32 comp_size; |
| __u32 frame_size; |
| __u32 frame_headroom; |
| }; |
| |
| int xsk_umem__create_v0_0_2(struct xsk_umem **umem_ptr, void *umem_area, |
| __u64 size, struct xsk_ring_prod *fill, |
| struct xsk_ring_cons *comp, |
| const struct xsk_umem_config *usr_config) |
| { |
| struct xsk_umem_config config; |
| |
| memcpy(&config, usr_config, sizeof(struct xsk_umem_config_v1)); |
| config.flags = 0; |
| |
| return xsk_umem__create_v0_0_4(umem_ptr, umem_area, size, fill, comp, |
| &config); |
| } |
| COMPAT_VERSION(xsk_umem__create_v0_0_2, xsk_umem__create, LIBBPF_0.0.2) |
| DEFAULT_VERSION(xsk_umem__create_v0_0_4, xsk_umem__create, LIBBPF_0.0.4) |
| |
| static int xsk_load_xdp_prog(struct xsk_socket *xsk) |
| { |
| static const int log_buf_size = 16 * 1024; |
| char log_buf[log_buf_size]; |
| int err, prog_fd; |
| |
| /* This is the C-program: |
| * SEC("xdp_sock") int xdp_sock_prog(struct xdp_md *ctx) |
| * { |
| * int index = ctx->rx_queue_index; |
| * |
| * // A set entry here means that the correspnding queue_id |
| * // has an active AF_XDP socket bound to it. |
| * if (bpf_map_lookup_elem(&xsks_map, &index)) |
| * return bpf_redirect_map(&xsks_map, index, 0); |
| * |
| * return XDP_PASS; |
| * } |
| */ |
| struct bpf_insn prog[] = { |
| /* r1 = *(u32 *)(r1 + 16) */ |
| BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_1, 16), |
| /* *(u32 *)(r10 - 4) = r1 */ |
| BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_1, -4), |
| BPF_MOV64_REG(BPF_REG_2, BPF_REG_10), |
| BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4), |
| BPF_LD_MAP_FD(BPF_REG_1, xsk->xsks_map_fd), |
| BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem), |
| BPF_MOV64_REG(BPF_REG_1, BPF_REG_0), |
| BPF_MOV32_IMM(BPF_REG_0, 2), |
| /* if r1 == 0 goto +5 */ |
| BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 5), |
| /* r2 = *(u32 *)(r10 - 4) */ |
| BPF_LD_MAP_FD(BPF_REG_1, xsk->xsks_map_fd), |
| BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_10, -4), |
| BPF_MOV32_IMM(BPF_REG_3, 0), |
| BPF_EMIT_CALL(BPF_FUNC_redirect_map), |
| /* The jumps are to this instruction */ |
| BPF_EXIT_INSN(), |
| }; |
| size_t insns_cnt = sizeof(prog) / sizeof(struct bpf_insn); |
| |
| prog_fd = bpf_load_program(BPF_PROG_TYPE_XDP, prog, insns_cnt, |
| "LGPL-2.1 or BSD-2-Clause", 0, log_buf, |
| log_buf_size); |
| if (prog_fd < 0) { |
| pr_warning("BPF log buffer:\n%s", log_buf); |
| return prog_fd; |
| } |
| |
| err = bpf_set_link_xdp_fd(xsk->ifindex, prog_fd, xsk->config.xdp_flags); |
| if (err) { |
| close(prog_fd); |
| return err; |
| } |
| |
| xsk->prog_fd = prog_fd; |
| return 0; |
| } |
| |
| static int xsk_get_max_queues(struct xsk_socket *xsk) |
| { |
| struct ethtool_channels channels = { .cmd = ETHTOOL_GCHANNELS }; |
| struct ifreq ifr = {}; |
| int fd, err, ret; |
| |
| fd = socket(AF_INET, SOCK_DGRAM, 0); |
| if (fd < 0) |
| return -errno; |
| |
| ifr.ifr_data = (void *)&channels; |
| memcpy(ifr.ifr_name, xsk->ifname, IFNAMSIZ - 1); |
| ifr.ifr_name[IFNAMSIZ - 1] = '\0'; |
| err = ioctl(fd, SIOCETHTOOL, &ifr); |
| if (err && errno != EOPNOTSUPP) { |
| ret = -errno; |
| goto out; |
| } |
| |
| if (err) { |
| /* If the device says it has no channels, then all traffic |
| * is sent to a single stream, so max queues = 1. |
| */ |
| ret = 1; |
| } else { |
| /* Take the max of rx, tx, combined. Drivers return |
| * the number of channels in different ways. |
| */ |
| ret = max(channels.max_rx, channels.max_tx); |
| ret = max(ret, (int)channels.max_combined); |
| } |
| |
| out: |
| close(fd); |
| return ret; |
| } |
| |
| static int xsk_create_bpf_maps(struct xsk_socket *xsk) |
| { |
| int max_queues; |
| int fd; |
| |
| max_queues = xsk_get_max_queues(xsk); |
| if (max_queues < 0) |
| return max_queues; |
| |
| fd = bpf_create_map_name(BPF_MAP_TYPE_XSKMAP, "xsks_map", |
| sizeof(int), sizeof(int), max_queues, 0); |
| if (fd < 0) |
| return fd; |
| |
| xsk->xsks_map_fd = fd; |
| |
| return 0; |
| } |
| |
| static void xsk_delete_bpf_maps(struct xsk_socket *xsk) |
| { |
| bpf_map_delete_elem(xsk->xsks_map_fd, &xsk->queue_id); |
| close(xsk->xsks_map_fd); |
| } |
| |
| static int xsk_lookup_bpf_maps(struct xsk_socket *xsk) |
| { |
| __u32 i, *map_ids, num_maps, prog_len = sizeof(struct bpf_prog_info); |
| __u32 map_len = sizeof(struct bpf_map_info); |
| struct bpf_prog_info prog_info = {}; |
| struct bpf_map_info map_info; |
| int fd, err; |
| |
| err = bpf_obj_get_info_by_fd(xsk->prog_fd, &prog_info, &prog_len); |
| if (err) |
| return err; |
| |
| num_maps = prog_info.nr_map_ids; |
| |
| map_ids = calloc(prog_info.nr_map_ids, sizeof(*map_ids)); |
| if (!map_ids) |
| return -ENOMEM; |
| |
| memset(&prog_info, 0, prog_len); |
| prog_info.nr_map_ids = num_maps; |
| prog_info.map_ids = (__u64)(unsigned long)map_ids; |
| |
| err = bpf_obj_get_info_by_fd(xsk->prog_fd, &prog_info, &prog_len); |
| if (err) |
| goto out_map_ids; |
| |
| xsk->xsks_map_fd = -1; |
| |
| for (i = 0; i < prog_info.nr_map_ids; i++) { |
| fd = bpf_map_get_fd_by_id(map_ids[i]); |
| if (fd < 0) |
| continue; |
| |
| err = bpf_obj_get_info_by_fd(fd, &map_info, &map_len); |
| if (err) { |
| close(fd); |
| continue; |
| } |
| |
| if (!strcmp(map_info.name, "xsks_map")) { |
| xsk->xsks_map_fd = fd; |
| continue; |
| } |
| |
| close(fd); |
| } |
| |
| err = 0; |
| if (xsk->xsks_map_fd == -1) |
| err = -ENOENT; |
| |
| out_map_ids: |
| free(map_ids); |
| return err; |
| } |
| |
| static int xsk_set_bpf_maps(struct xsk_socket *xsk) |
| { |
| return bpf_map_update_elem(xsk->xsks_map_fd, &xsk->queue_id, |
| &xsk->fd, 0); |
| } |
| |
| static int xsk_setup_xdp_prog(struct xsk_socket *xsk) |
| { |
| __u32 prog_id = 0; |
| int err; |
| |
| err = bpf_get_link_xdp_id(xsk->ifindex, &prog_id, |
| xsk->config.xdp_flags); |
| if (err) |
| return err; |
| |
| if (!prog_id) { |
| err = xsk_create_bpf_maps(xsk); |
| if (err) |
| return err; |
| |
| err = xsk_load_xdp_prog(xsk); |
| if (err) { |
| xsk_delete_bpf_maps(xsk); |
| return err; |
| } |
| } else { |
| xsk->prog_fd = bpf_prog_get_fd_by_id(prog_id); |
| if (xsk->prog_fd < 0) |
| return -errno; |
| err = xsk_lookup_bpf_maps(xsk); |
| if (err) { |
| close(xsk->prog_fd); |
| return err; |
| } |
| } |
| |
| err = xsk_set_bpf_maps(xsk); |
| if (err) { |
| xsk_delete_bpf_maps(xsk); |
| close(xsk->prog_fd); |
| return err; |
| } |
| |
| return 0; |
| } |
| |
| int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname, |
| __u32 queue_id, struct xsk_umem *umem, |
| struct xsk_ring_cons *rx, struct xsk_ring_prod *tx, |
| const struct xsk_socket_config *usr_config) |
| { |
| void *rx_map = NULL, *tx_map = NULL; |
| struct sockaddr_xdp sxdp = {}; |
| struct xdp_mmap_offsets off; |
| struct xsk_socket *xsk; |
| int err; |
| |
| if (!umem || !xsk_ptr || !rx || !tx) |
| return -EFAULT; |
| |
| if (umem->refcount) { |
| pr_warning("Error: shared umems not supported by libbpf.\n"); |
| return -EBUSY; |
| } |
| |
| xsk = calloc(1, sizeof(*xsk)); |
| if (!xsk) |
| return -ENOMEM; |
| |
| if (umem->refcount++ > 0) { |
| xsk->fd = socket(AF_XDP, SOCK_RAW, 0); |
| if (xsk->fd < 0) { |
| err = -errno; |
| goto out_xsk_alloc; |
| } |
| } else { |
| xsk->fd = umem->fd; |
| } |
| |
| xsk->outstanding_tx = 0; |
| xsk->queue_id = queue_id; |
| xsk->umem = umem; |
| xsk->ifindex = if_nametoindex(ifname); |
| if (!xsk->ifindex) { |
| err = -errno; |
| goto out_socket; |
| } |
| memcpy(xsk->ifname, ifname, IFNAMSIZ - 1); |
| xsk->ifname[IFNAMSIZ - 1] = '\0'; |
| |
| err = xsk_set_xdp_socket_config(&xsk->config, usr_config); |
| if (err) |
| goto out_socket; |
| |
| if (rx) { |
| err = setsockopt(xsk->fd, SOL_XDP, XDP_RX_RING, |
| &xsk->config.rx_size, |
| sizeof(xsk->config.rx_size)); |
| if (err) { |
| err = -errno; |
| goto out_socket; |
| } |
| } |
| if (tx) { |
| err = setsockopt(xsk->fd, SOL_XDP, XDP_TX_RING, |
| &xsk->config.tx_size, |
| sizeof(xsk->config.tx_size)); |
| if (err) { |
| err = -errno; |
| goto out_socket; |
| } |
| } |
| |
| err = xsk_get_mmap_offsets(xsk->fd, &off); |
| if (err) { |
| err = -errno; |
| goto out_socket; |
| } |
| |
| if (rx) { |
| rx_map = mmap(NULL, off.rx.desc + |
| xsk->config.rx_size * sizeof(struct xdp_desc), |
| PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, |
| xsk->fd, XDP_PGOFF_RX_RING); |
| if (rx_map == MAP_FAILED) { |
| err = -errno; |
| goto out_socket; |
| } |
| |
| rx->mask = xsk->config.rx_size - 1; |
| rx->size = xsk->config.rx_size; |
| rx->producer = rx_map + off.rx.producer; |
| rx->consumer = rx_map + off.rx.consumer; |
| rx->flags = rx_map + off.rx.flags; |
| rx->ring = rx_map + off.rx.desc; |
| } |
| xsk->rx = rx; |
| |
| if (tx) { |
| tx_map = mmap(NULL, off.tx.desc + |
| xsk->config.tx_size * sizeof(struct xdp_desc), |
| PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, |
| xsk->fd, XDP_PGOFF_TX_RING); |
| if (tx_map == MAP_FAILED) { |
| err = -errno; |
| goto out_mmap_rx; |
| } |
| |
| tx->mask = xsk->config.tx_size - 1; |
| tx->size = xsk->config.tx_size; |
| tx->producer = tx_map + off.tx.producer; |
| tx->consumer = tx_map + off.tx.consumer; |
| tx->flags = tx_map + off.tx.flags; |
| tx->ring = tx_map + off.tx.desc; |
| tx->cached_cons = xsk->config.tx_size; |
| } |
| xsk->tx = tx; |
| |
| sxdp.sxdp_family = PF_XDP; |
| sxdp.sxdp_ifindex = xsk->ifindex; |
| sxdp.sxdp_queue_id = xsk->queue_id; |
| sxdp.sxdp_flags = xsk->config.bind_flags; |
| |
| err = bind(xsk->fd, (struct sockaddr *)&sxdp, sizeof(sxdp)); |
| if (err) { |
| err = -errno; |
| goto out_mmap_tx; |
| } |
| |
| xsk->prog_fd = -1; |
| |
| if (!(xsk->config.libbpf_flags & XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD)) { |
| err = xsk_setup_xdp_prog(xsk); |
| if (err) |
| goto out_mmap_tx; |
| } |
| |
| *xsk_ptr = xsk; |
| return 0; |
| |
| out_mmap_tx: |
| if (tx) |
| munmap(tx_map, off.tx.desc + |
| xsk->config.tx_size * sizeof(struct xdp_desc)); |
| out_mmap_rx: |
| if (rx) |
| munmap(rx_map, off.rx.desc + |
| xsk->config.rx_size * sizeof(struct xdp_desc)); |
| out_socket: |
| if (--umem->refcount) |
| close(xsk->fd); |
| out_xsk_alloc: |
| free(xsk); |
| return err; |
| } |
| |
| int xsk_umem__delete(struct xsk_umem *umem) |
| { |
| struct xdp_mmap_offsets off; |
| int err; |
| |
| if (!umem) |
| return 0; |
| |
| if (umem->refcount) |
| return -EBUSY; |
| |
| err = xsk_get_mmap_offsets(umem->fd, &off); |
| if (!err) { |
| munmap(umem->fill->ring - off.fr.desc, |
| off.fr.desc + umem->config.fill_size * sizeof(__u64)); |
| munmap(umem->comp->ring - off.cr.desc, |
| off.cr.desc + umem->config.comp_size * sizeof(__u64)); |
| } |
| |
| close(umem->fd); |
| free(umem); |
| |
| return 0; |
| } |
| |
| void xsk_socket__delete(struct xsk_socket *xsk) |
| { |
| size_t desc_sz = sizeof(struct xdp_desc); |
| struct xdp_mmap_offsets off; |
| int err; |
| |
| if (!xsk) |
| return; |
| |
| if (xsk->prog_fd != -1) { |
| xsk_delete_bpf_maps(xsk); |
| close(xsk->prog_fd); |
| } |
| |
| err = xsk_get_mmap_offsets(xsk->fd, &off); |
| if (!err) { |
| if (xsk->rx) { |
| munmap(xsk->rx->ring - off.rx.desc, |
| off.rx.desc + xsk->config.rx_size * desc_sz); |
| } |
| if (xsk->tx) { |
| munmap(xsk->tx->ring - off.tx.desc, |
| off.tx.desc + xsk->config.tx_size * desc_sz); |
| } |
| |
| } |
| |
| xsk->umem->refcount--; |
| /* Do not close an fd that also has an associated umem connected |
| * to it. |
| */ |
| if (xsk->fd != xsk->umem->fd) |
| close(xsk->fd); |
| free(xsk); |
| } |