diff options
Diffstat (limited to 'tools/lib/bpf/xsk.c')
| -rw-r--r-- | tools/lib/bpf/xsk.c | 812 |
1 files changed, 0 insertions, 812 deletions
diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c deleted file mode 100644 index f7f4efb70a4c..000000000000 --- a/tools/lib/bpf/xsk.c +++ /dev/null @@ -1,812 +0,0 @@ -// 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" - -/* make sure libbpf doesn't use kernel-only integer typedefs */ -#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64 - -#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_prod = *fill->producer; - /* cached_cons is "size" bigger than the real consumer pointer - * See xsk_prod_nb_free - */ - fill->cached_cons = *fill->consumer + 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; - comp->cached_prod = *comp->producer; - comp->cached_cons = *comp->consumer; - - *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 ret, index = ctx->rx_queue_index; - * - * // A set entry here means that the correspnding queue_id - * // has an active AF_XDP socket bound to it. - * ret = bpf_redirect_map(&xsks_map, index, XDP_PASS); - * if (ret > 0) - * return ret; - * - * // Fallback for pre-5.3 kernels, not supporting default - * // action in the flags parameter. - * if (bpf_map_lookup_elem(&xsks_map, &index)) - * return bpf_redirect_map(&xsks_map, index, 0); - * return XDP_PASS; - * } - */ - struct bpf_insn prog[] = { - /* r2 = *(u32 *)(r1 + 16) */ - BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1, 16), - /* *(u32 *)(r10 - 4) = r2 */ - BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_2, -4), - /* r1 = xskmap[] */ - BPF_LD_MAP_FD(BPF_REG_1, xsk->xsks_map_fd), - /* r3 = XDP_PASS */ - BPF_MOV64_IMM(BPF_REG_3, 2), - /* call bpf_redirect_map */ - BPF_EMIT_CALL(BPF_FUNC_redirect_map), - /* if w0 != 0 goto pc+13 */ - BPF_JMP32_IMM(BPF_JSGT, BPF_REG_0, 0, 13), - /* r2 = r10 */ - BPF_MOV64_REG(BPF_REG_2, BPF_REG_10), - /* r2 += -4 */ - BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4), - /* r1 = xskmap[] */ - BPF_LD_MAP_FD(BPF_REG_1, xsk->xsks_map_fd), - /* call bpf_map_lookup_elem */ - BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem), - /* r1 = r0 */ - BPF_MOV64_REG(BPF_REG_1, BPF_REG_0), - /* r0 = XDP_PASS */ - BPF_MOV64_IMM(BPF_REG_0, 2), - /* if r1 == 0 goto pc+5 */ - BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 5), - /* r2 = *(u32 *)(r10 - 4) */ - BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_10, -4), - /* r1 = xskmap[] */ - BPF_LD_MAP_FD(BPF_REG_1, xsk->xsks_map_fd), - /* r3 = 0 */ - BPF_MOV64_IMM(BPF_REG_3, 0), - /* call bpf_redirect_map */ - 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_warn("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; - } - } - - if (xsk->rx) - 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; - - xsk = calloc(1, sizeof(*xsk)); - if (!xsk) - return -ENOMEM; - - err = xsk_set_xdp_socket_config(&xsk->config, usr_config); - if (err) - goto out_xsk_alloc; - - if (umem->refcount && - !(xsk->config.libbpf_flags & XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD)) { - pr_warn("Error: shared umems not supported by libbpf supplied XDP program.\n"); - err = -EBUSY; - goto out_xsk_alloc; - } - - 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'; - - 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; - rx->cached_prod = *rx->producer; - rx->cached_cons = *rx->consumer; - } - 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_prod = *tx->producer; - /* cached_cons is r->size bigger than the real consumer pointer - * See xsk_prod_nb_free - */ - tx->cached_cons = *tx->consumer + xsk->config.tx_size; - } - xsk->tx = tx; - - sxdp.sxdp_family = PF_XDP; - sxdp.sxdp_ifindex = xsk->ifindex; - sxdp.sxdp_queue_id = xsk->queue_id; - if (umem->refcount > 1) { - sxdp.sxdp_flags = XDP_SHARED_UMEM; - sxdp.sxdp_shared_umem_fd = umem->fd; - } else { - 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); -} |