From: Magnus Karlsson Date: Fri, 28 Aug 2020 08:26:27 +0000 (+0200) Subject: libbpf: Support shared umems between queues and devices X-Git-Tag: baikal/aarch64/sdk6.1~8144^2~394^2~6 X-Git-Url: https://git.baikalelectronics.ru/sdk/?a=commitdiff_plain;h=d31988fd4fb856f8935cf970a4c54588b6d45021;p=kernel.git libbpf: Support shared umems between queues and devices Add support for shared umems between hardware queues and devices to the AF_XDP part of libbpf. This so that zero-copy can be achieved in applications that want to send and receive packets between HW queues on one device or between different devices/netdevs. In order to create sockets that share a umem between hardware queues and devices, a new function has been added called xsk_socket__create_shared(). It takes the same arguments as xsk_socket_create() plus references to a fill ring and a completion ring. So for every socket that share a umem, you need to have one more set of fill and completion rings. This in order to maintain the single-producer single-consumer semantics of the rings. You can create all the sockets via the new xsk_socket__create_shared() call, or create the first one with xsk_socket__create() and the rest with xsk_socket__create_shared(). Both methods work. Signed-off-by: Magnus Karlsson Signed-off-by: Daniel Borkmann Acked-by: Björn Töpel Link: https://lore.kernel.org/bpf/1598603189-32145-14-git-send-email-magnus.karlsson@intel.com --- diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map index 66a6286d0716a..3fedcdc4ae2f4 100644 --- a/tools/lib/bpf/libbpf.map +++ b/tools/lib/bpf/libbpf.map @@ -306,4 +306,5 @@ LIBBPF_0.2.0 { perf_buffer__buffer_fd; perf_buffer__epoll_fd; perf_buffer__consume_buffer; + xsk_socket__create_shared; } LIBBPF_0.1.0; diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c index a9b02103767b8..49c3245947922 100644 --- a/tools/lib/bpf/xsk.c +++ b/tools/lib/bpf/xsk.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include #include @@ -45,26 +46,35 @@ #endif struct xsk_umem { - struct xsk_ring_prod *fill; - struct xsk_ring_cons *comp; + struct xsk_ring_prod *fill_save; + struct xsk_ring_cons *comp_save; char *umem_area; struct xsk_umem_config config; int fd; int refcount; + struct list_head ctx_list; +}; + +struct xsk_ctx { + struct xsk_ring_prod *fill; + struct xsk_ring_cons *comp; + __u32 queue_id; + struct xsk_umem *umem; + int refcount; + int ifindex; + struct list_head list; + int prog_fd; + int xsks_map_fd; + char ifname[IFNAMSIZ]; }; struct xsk_socket { struct xsk_ring_cons *rx; struct xsk_ring_prod *tx; __u64 outstanding_tx; - struct xsk_umem *umem; + struct xsk_ctx *ctx; 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 { @@ -200,15 +210,73 @@ static int xsk_get_mmap_offsets(int fd, struct xdp_mmap_offsets *off) return -EINVAL; } +static int xsk_create_umem_rings(struct xsk_umem *umem, int fd, + struct xsk_ring_prod *fill, + struct xsk_ring_cons *comp) +{ + struct xdp_mmap_offsets off; + void *map; + int err; + + err = setsockopt(fd, SOL_XDP, XDP_UMEM_FILL_RING, + &umem->config.fill_size, + sizeof(umem->config.fill_size)); + if (err) + return -errno; + + err = setsockopt(fd, SOL_XDP, XDP_UMEM_COMPLETION_RING, + &umem->config.comp_size, + sizeof(umem->config.comp_size)); + if (err) + return -errno; + + err = xsk_get_mmap_offsets(fd, &off); + if (err) + return -errno; + + map = mmap(NULL, off.fr.desc + umem->config.fill_size * sizeof(__u64), + PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, fd, + XDP_UMEM_PGOFF_FILL_RING); + if (map == MAP_FAILED) + return -errno; + + 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, fd, + XDP_UMEM_PGOFF_COMPLETION_RING); + if (map == MAP_FAILED) { + err = -errno; + goto out_mmap; + } + + 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; + + return 0; + +out_mmap: + munmap(map, off.fr.desc + umem->config.fill_size * sizeof(__u64)); + return err; +} + 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) @@ -227,6 +295,7 @@ int xsk_umem__create_v0_0_4(struct xsk_umem **umem_ptr, void *umem_area, } umem->umem_area = umem_area; + INIT_LIST_HEAD(&umem->ctx_list); xsk_set_umem_config(&umem->config, usr_config); memset(&mr, 0, sizeof(mr)); @@ -241,71 +310,16 @@ int xsk_umem__create_v0_0_4(struct xsk_umem **umem_ptr, void *umem_area, 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; + err = xsk_create_umem_rings(umem, umem->fd, fill, comp); + if (err) 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->fill_save = fill; + umem->comp_save = comp; *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: @@ -339,6 +353,7 @@ 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; + struct xsk_ctx *ctx = xsk->ctx; char log_buf[log_buf_size]; int err, prog_fd; @@ -366,7 +381,7 @@ static int xsk_load_xdp_prog(struct xsk_socket *xsk) /* *(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), + BPF_LD_MAP_FD(BPF_REG_1, ctx->xsks_map_fd), /* r3 = XDP_PASS */ BPF_MOV64_IMM(BPF_REG_3, 2), /* call bpf_redirect_map */ @@ -378,7 +393,7 @@ static int xsk_load_xdp_prog(struct xsk_socket *xsk) /* r2 += -4 */ BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4), /* r1 = xskmap[] */ - BPF_LD_MAP_FD(BPF_REG_1, xsk->xsks_map_fd), + BPF_LD_MAP_FD(BPF_REG_1, ctx->xsks_map_fd), /* call bpf_map_lookup_elem */ BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem), /* r1 = r0 */ @@ -390,7 +405,7 @@ static int xsk_load_xdp_prog(struct xsk_socket *xsk) /* 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), + BPF_LD_MAP_FD(BPF_REG_1, ctx->xsks_map_fd), /* r3 = 0 */ BPF_MOV64_IMM(BPF_REG_3, 0), /* call bpf_redirect_map */ @@ -408,19 +423,21 @@ static int xsk_load_xdp_prog(struct xsk_socket *xsk) return prog_fd; } - err = bpf_set_link_xdp_fd(xsk->ifindex, prog_fd, xsk->config.xdp_flags); + err = bpf_set_link_xdp_fd(xsk->ctx->ifindex, prog_fd, + xsk->config.xdp_flags); if (err) { close(prog_fd); return err; } - xsk->prog_fd = prog_fd; + ctx->prog_fd = prog_fd; return 0; } static int xsk_get_max_queues(struct xsk_socket *xsk) { struct ethtool_channels channels = { .cmd = ETHTOOL_GCHANNELS }; + struct xsk_ctx *ctx = xsk->ctx; struct ifreq ifr = {}; int fd, err, ret; @@ -429,7 +446,7 @@ static int xsk_get_max_queues(struct xsk_socket *xsk) return -errno; ifr.ifr_data = (void *)&channels; - memcpy(ifr.ifr_name, xsk->ifname, IFNAMSIZ - 1); + memcpy(ifr.ifr_name, ctx->ifname, IFNAMSIZ - 1); ifr.ifr_name[IFNAMSIZ - 1] = '\0'; err = ioctl(fd, SIOCETHTOOL, &ifr); if (err && errno != EOPNOTSUPP) { @@ -457,6 +474,7 @@ out: static int xsk_create_bpf_maps(struct xsk_socket *xsk) { + struct xsk_ctx *ctx = xsk->ctx; int max_queues; int fd; @@ -469,15 +487,17 @@ static int xsk_create_bpf_maps(struct xsk_socket *xsk) if (fd < 0) return fd; - xsk->xsks_map_fd = fd; + ctx->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); + struct xsk_ctx *ctx = xsk->ctx; + + bpf_map_delete_elem(ctx->xsks_map_fd, &ctx->queue_id); + close(ctx->xsks_map_fd); } static int xsk_lookup_bpf_maps(struct xsk_socket *xsk) @@ -485,10 +505,11 @@ 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 xsk_ctx *ctx = xsk->ctx; struct bpf_map_info map_info; int fd, err; - err = bpf_obj_get_info_by_fd(xsk->prog_fd, &prog_info, &prog_len); + err = bpf_obj_get_info_by_fd(ctx->prog_fd, &prog_info, &prog_len); if (err) return err; @@ -502,11 +523,11 @@ static int xsk_lookup_bpf_maps(struct xsk_socket *xsk) 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); + err = bpf_obj_get_info_by_fd(ctx->prog_fd, &prog_info, &prog_len); if (err) goto out_map_ids; - xsk->xsks_map_fd = -1; + ctx->xsks_map_fd = -1; for (i = 0; i < prog_info.nr_map_ids; i++) { fd = bpf_map_get_fd_by_id(map_ids[i]); @@ -520,7 +541,7 @@ static int xsk_lookup_bpf_maps(struct xsk_socket *xsk) } if (!strcmp(map_info.name, "xsks_map")) { - xsk->xsks_map_fd = fd; + ctx->xsks_map_fd = fd; continue; } @@ -528,7 +549,7 @@ static int xsk_lookup_bpf_maps(struct xsk_socket *xsk) } err = 0; - if (xsk->xsks_map_fd == -1) + if (ctx->xsks_map_fd == -1) err = -ENOENT; out_map_ids: @@ -538,16 +559,19 @@ out_map_ids: static int xsk_set_bpf_maps(struct xsk_socket *xsk) { - return bpf_map_update_elem(xsk->xsks_map_fd, &xsk->queue_id, + struct xsk_ctx *ctx = xsk->ctx; + + return bpf_map_update_elem(ctx->xsks_map_fd, &ctx->queue_id, &xsk->fd, 0); } static int xsk_setup_xdp_prog(struct xsk_socket *xsk) { + struct xsk_ctx *ctx = xsk->ctx; __u32 prog_id = 0; int err; - err = bpf_get_link_xdp_id(xsk->ifindex, &prog_id, + err = bpf_get_link_xdp_id(ctx->ifindex, &prog_id, xsk->config.xdp_flags); if (err) return err; @@ -563,12 +587,12 @@ static int xsk_setup_xdp_prog(struct xsk_socket *xsk) return err; } } else { - xsk->prog_fd = bpf_prog_get_fd_by_id(prog_id); - if (xsk->prog_fd < 0) + ctx->prog_fd = bpf_prog_get_fd_by_id(prog_id); + if (ctx->prog_fd < 0) return -errno; err = xsk_lookup_bpf_maps(xsk); if (err) { - close(xsk->prog_fd); + close(ctx->prog_fd); return err; } } @@ -577,25 +601,110 @@ static int xsk_setup_xdp_prog(struct xsk_socket *xsk) err = xsk_set_bpf_maps(xsk); if (err) { xsk_delete_bpf_maps(xsk); - close(xsk->prog_fd); + close(ctx->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) +static struct xsk_ctx *xsk_get_ctx(struct xsk_umem *umem, int ifindex, + __u32 queue_id) +{ + struct xsk_ctx *ctx; + + if (list_empty(&umem->ctx_list)) + return NULL; + + list_for_each_entry(ctx, &umem->ctx_list, list) { + if (ctx->ifindex == ifindex && ctx->queue_id == queue_id) { + ctx->refcount++; + return ctx; + } + } + + return NULL; +} + +static void xsk_put_ctx(struct xsk_ctx *ctx) +{ + struct xsk_umem *umem = ctx->umem; + struct xdp_mmap_offsets off; + int err; + + if (--ctx->refcount == 0) { + err = xsk_get_mmap_offsets(umem->fd, &off); + if (!err) { + munmap(ctx->fill->ring - off.fr.desc, + off.fr.desc + umem->config.fill_size * + sizeof(__u64)); + munmap(ctx->comp->ring - off.cr.desc, + off.cr.desc + umem->config.comp_size * + sizeof(__u64)); + } + + list_del(&ctx->list); + free(ctx); + } +} + +static struct xsk_ctx *xsk_create_ctx(struct xsk_socket *xsk, + struct xsk_umem *umem, int ifindex, + const char *ifname, __u32 queue_id, + struct xsk_ring_prod *fill, + struct xsk_ring_cons *comp) +{ + struct xsk_ctx *ctx; + int err; + + ctx = calloc(1, sizeof(*ctx)); + if (!ctx) + return NULL; + + if (!umem->fill_save) { + err = xsk_create_umem_rings(umem, xsk->fd, fill, comp); + if (err) { + free(ctx); + return NULL; + } + } else if (umem->fill_save != fill || umem->comp_save != comp) { + /* Copy over rings to new structs. */ + memcpy(fill, umem->fill_save, sizeof(*fill)); + memcpy(comp, umem->comp_save, sizeof(*comp)); + } + + ctx->ifindex = ifindex; + ctx->refcount = 1; + ctx->umem = umem; + ctx->queue_id = queue_id; + memcpy(ctx->ifname, ifname, IFNAMSIZ - 1); + ctx->ifname[IFNAMSIZ - 1] = '\0'; + + umem->fill_save = NULL; + umem->comp_save = NULL; + ctx->fill = fill; + ctx->comp = comp; + list_add(&ctx->list, &umem->ctx_list); + return ctx; +} + +int xsk_socket__create_shared(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, + struct xsk_ring_prod *fill, + struct xsk_ring_cons *comp, + 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; + struct xsk_ctx *ctx; + int err, ifindex; - if (!umem || !xsk_ptr || !(rx || tx)) + if (!umem || !xsk_ptr || !(rx || tx) || !fill || !comp) return -EFAULT; xsk = calloc(1, sizeof(*xsk)); @@ -606,10 +715,10 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname, 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; + xsk->outstanding_tx = 0; + ifindex = if_nametoindex(ifname); + if (!ifindex) { + err = -errno; goto out_xsk_alloc; } @@ -623,16 +732,16 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname, 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; + ctx = xsk_get_ctx(umem, ifindex, queue_id); + if (!ctx) { + ctx = xsk_create_ctx(xsk, umem, ifindex, ifname, queue_id, + fill, comp); + if (!ctx) { + err = -ENOMEM; + goto out_socket; + } } - memcpy(xsk->ifname, ifname, IFNAMSIZ - 1); - xsk->ifname[IFNAMSIZ - 1] = '\0'; + xsk->ctx = ctx; if (rx) { err = setsockopt(xsk->fd, SOL_XDP, XDP_RX_RING, @@ -640,7 +749,7 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname, sizeof(xsk->config.rx_size)); if (err) { err = -errno; - goto out_socket; + goto out_put_ctx; } } if (tx) { @@ -649,14 +758,14 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname, sizeof(xsk->config.tx_size)); if (err) { err = -errno; - goto out_socket; + goto out_put_ctx; } } err = xsk_get_mmap_offsets(xsk->fd, &off); if (err) { err = -errno; - goto out_socket; + goto out_put_ctx; } if (rx) { @@ -666,7 +775,7 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname, xsk->fd, XDP_PGOFF_RX_RING); if (rx_map == MAP_FAILED) { err = -errno; - goto out_socket; + goto out_put_ctx; } rx->mask = xsk->config.rx_size - 1; @@ -705,10 +814,10 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname, xsk->tx = tx; sxdp.sxdp_family = PF_XDP; - sxdp.sxdp_ifindex = xsk->ifindex; - sxdp.sxdp_queue_id = xsk->queue_id; + sxdp.sxdp_ifindex = ctx->ifindex; + sxdp.sxdp_queue_id = ctx->queue_id; if (umem->refcount > 1) { - sxdp.sxdp_flags = XDP_SHARED_UMEM; + sxdp.sxdp_flags |= XDP_SHARED_UMEM; sxdp.sxdp_shared_umem_fd = umem->fd; } else { sxdp.sxdp_flags = xsk->config.bind_flags; @@ -720,7 +829,7 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname, goto out_mmap_tx; } - xsk->prog_fd = -1; + ctx->prog_fd = -1; if (!(xsk->config.libbpf_flags & XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD)) { err = xsk_setup_xdp_prog(xsk); @@ -739,6 +848,8 @@ out_mmap_rx: if (rx) munmap(rx_map, off.rx.desc + xsk->config.rx_size * sizeof(struct xdp_desc)); +out_put_ctx: + xsk_put_ctx(ctx); out_socket: if (--umem->refcount) close(xsk->fd); @@ -747,25 +858,24 @@ out_xsk_alloc: return err; } -int xsk_umem__delete(struct xsk_umem *umem) +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) { - struct xdp_mmap_offsets off; - int err; + return xsk_socket__create_shared(xsk_ptr, ifname, queue_id, umem, + rx, tx, umem->fill_save, + umem->comp_save, usr_config); +} +int xsk_umem__delete(struct xsk_umem *umem) +{ 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); @@ -775,15 +885,16 @@ int xsk_umem__delete(struct xsk_umem *umem) void xsk_socket__delete(struct xsk_socket *xsk) { size_t desc_sz = sizeof(struct xdp_desc); + struct xsk_ctx *ctx = xsk->ctx; struct xdp_mmap_offsets off; int err; if (!xsk) return; - if (xsk->prog_fd != -1) { + if (ctx->prog_fd != -1) { xsk_delete_bpf_maps(xsk); - close(xsk->prog_fd); + close(ctx->prog_fd); } err = xsk_get_mmap_offsets(xsk->fd, &off); @@ -796,14 +907,15 @@ void xsk_socket__delete(struct xsk_socket *xsk) munmap(xsk->tx->ring - off.tx.desc, off.tx.desc + xsk->config.tx_size * desc_sz); } - } - xsk->umem->refcount--; + xsk_put_ctx(ctx); + + ctx->umem->refcount--; /* Do not close an fd that also has an associated umem connected * to it. */ - if (xsk->fd != xsk->umem->fd) + if (xsk->fd != ctx->umem->fd) close(xsk->fd); free(xsk); } diff --git a/tools/lib/bpf/xsk.h b/tools/lib/bpf/xsk.h index 584f6820a6397..1069c46364ffb 100644 --- a/tools/lib/bpf/xsk.h +++ b/tools/lib/bpf/xsk.h @@ -234,6 +234,15 @@ LIBBPF_API int xsk_socket__create(struct xsk_socket **xsk, struct xsk_ring_cons *rx, struct xsk_ring_prod *tx, const struct xsk_socket_config *config); +LIBBPF_API int +xsk_socket__create_shared(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, + struct xsk_ring_prod *fill, + struct xsk_ring_cons *comp, + const struct xsk_socket_config *config); /* Returns 0 for success and -EBUSY if the umem is still in use. */ LIBBPF_API int xsk_umem__delete(struct xsk_umem *umem);