* [PATCH v2 bpf-next 1/2] bpf: Allow bpf_map_lookup_elem() on an xskmap @ 2019-05-30 18:57 Jonathan Lemon 2019-05-30 18:57 ` [PATCH v2 bpf-next 2/2] libbpf: remove qidconf and better support external bpf programs Jonathan Lemon 2019-05-31 11:49 ` [PATCH v2 bpf-next 1/2] bpf: Allow bpf_map_lookup_elem() on an xskmap Björn Töpel 0 siblings, 2 replies; 7+ messages in thread From: Jonathan Lemon @ 2019-05-30 18:57 UTC (permalink / raw) To: netdev, bjorn.topel, magnus.karlsson; +Cc: kernel-team Currently, the AF_XDP code uses a separate map in order to determine if an xsk is bound to a queue. Instead of doing this, have bpf_map_lookup_elem() return the queue_id, as a way of indicating that there is a valid entry at the map index. Rearrange some xdp_sock members to eliminate structure holes. Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com> --- include/net/xdp_sock.h | 6 +++--- kernel/bpf/verifier.c | 6 +++++- kernel/bpf/xskmap.c | 4 +++- .../selftests/bpf/verifier/prevent_map_lookup.c | 15 --------------- 4 files changed, 11 insertions(+), 20 deletions(-) diff --git a/include/net/xdp_sock.h b/include/net/xdp_sock.h index d074b6d60f8a..7d84b1da43d2 100644 --- a/include/net/xdp_sock.h +++ b/include/net/xdp_sock.h @@ -57,12 +57,12 @@ struct xdp_sock { struct net_device *dev; struct xdp_umem *umem; struct list_head flush_node; - u16 queue_id; - struct xsk_queue *tx ____cacheline_aligned_in_smp; - struct list_head list; + u32 queue_id; bool zc; /* Protects multiple processes in the control path */ struct mutex mutex; + struct xsk_queue *tx ____cacheline_aligned_in_smp; + struct list_head list; /* Mutual exclusion of NAPI TX thread and sendmsg error paths * in the SKB destructor callback. */ diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 2778417e6e0c..91c730f85e92 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -2905,10 +2905,14 @@ static int check_map_func_compatibility(struct bpf_verifier_env *env, * appear. */ case BPF_MAP_TYPE_CPUMAP: - case BPF_MAP_TYPE_XSKMAP: if (func_id != BPF_FUNC_redirect_map) goto error; break; + case BPF_MAP_TYPE_XSKMAP: + if (func_id != BPF_FUNC_redirect_map && + func_id != BPF_FUNC_map_lookup_elem) + goto error; + break; case BPF_MAP_TYPE_ARRAY_OF_MAPS: case BPF_MAP_TYPE_HASH_OF_MAPS: if (func_id != BPF_FUNC_map_lookup_elem) diff --git a/kernel/bpf/xskmap.c b/kernel/bpf/xskmap.c index 686d244e798d..249b22089014 100644 --- a/kernel/bpf/xskmap.c +++ b/kernel/bpf/xskmap.c @@ -154,7 +154,9 @@ void __xsk_map_flush(struct bpf_map *map) static void *xsk_map_lookup_elem(struct bpf_map *map, void *key) { - return ERR_PTR(-EOPNOTSUPP); + struct xdp_sock *xs = __xsk_map_lookup_elem(map, *(u32 *)key); + + return xs ? &xs->queue_id : NULL; } static int xsk_map_update_elem(struct bpf_map *map, void *key, void *value, diff --git a/tools/testing/selftests/bpf/verifier/prevent_map_lookup.c b/tools/testing/selftests/bpf/verifier/prevent_map_lookup.c index bbdba990fefb..da7a4b37cb98 100644 --- a/tools/testing/selftests/bpf/verifier/prevent_map_lookup.c +++ b/tools/testing/selftests/bpf/verifier/prevent_map_lookup.c @@ -28,21 +28,6 @@ .errstr = "cannot pass map_type 18 into func bpf_map_lookup_elem", .prog_type = BPF_PROG_TYPE_SOCK_OPS, }, -{ - "prevent map lookup in xskmap", - .insns = { - BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0), - BPF_MOV64_REG(BPF_REG_2, BPF_REG_10), - BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8), - BPF_LD_MAP_FD(BPF_REG_1, 0), - BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem), - BPF_EXIT_INSN(), - }, - .fixup_map_xskmap = { 3 }, - .result = REJECT, - .errstr = "cannot pass map_type 17 into func bpf_map_lookup_elem", - .prog_type = BPF_PROG_TYPE_XDP, -}, { "prevent map lookup in stack trace", .insns = { -- 2.17.1 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* [PATCH v2 bpf-next 2/2] libbpf: remove qidconf and better support external bpf programs. 2019-05-30 18:57 [PATCH v2 bpf-next 1/2] bpf: Allow bpf_map_lookup_elem() on an xskmap Jonathan Lemon @ 2019-05-30 18:57 ` Jonathan Lemon 2019-05-31 11:55 ` Björn Töpel 2019-05-31 11:49 ` [PATCH v2 bpf-next 1/2] bpf: Allow bpf_map_lookup_elem() on an xskmap Björn Töpel 1 sibling, 1 reply; 7+ messages in thread From: Jonathan Lemon @ 2019-05-30 18:57 UTC (permalink / raw) To: netdev, bjorn.topel, magnus.karlsson; +Cc: kernel-team Use the recent change to XSKMAP bpf_map_lookup_elem() to test if there is a xsk present in the map instead of duplicating the work with qidconf. Fix things so callers using XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD bypass any internal bpf maps, so xsk_socket__{create|delete} works properly. Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com> --- tools/lib/bpf/xsk.c | 79 +++++++++------------------------------------ 1 file changed, 16 insertions(+), 63 deletions(-) diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c index 38667b62f1fe..a150493d51ec 100644 --- a/tools/lib/bpf/xsk.c +++ b/tools/lib/bpf/xsk.c @@ -60,10 +60,8 @@ struct xsk_socket { struct xsk_umem *umem; struct xsk_socket_config config; int fd; - int xsks_map; int ifindex; int prog_fd; - int qidconf_map_fd; int xsks_map_fd; __u32 queue_id; char ifname[IFNAMSIZ]; @@ -265,15 +263,11 @@ static int xsk_load_xdp_prog(struct xsk_socket *xsk) /* This is the C-program: * SEC("xdp_sock") int xdp_sock_prog(struct xdp_md *ctx) * { - * int *qidconf, index = ctx->rx_queue_index; + * 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. - * qidconf = bpf_map_lookup_elem(&qidconf_map, &index); - * if (!qidconf) - * return XDP_ABORTED; - * - * if (*qidconf) + * if (bpf_map_lookup_elem(&xsks_map, &index)) * return bpf_redirect_map(&xsks_map, index, 0); * * return XDP_PASS; @@ -286,15 +280,10 @@ static int xsk_load_xdp_prog(struct xsk_socket *xsk) 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->qidconf_map_fd), + 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, 0), - /* if r1 == 0 goto +8 */ - BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 8), BPF_MOV32_IMM(BPF_REG_0, 2), - /* r1 = *(u32 *)(r1 + 0) */ - BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_1, 0), /* if r1 == 0 goto +5 */ BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 5), /* r2 = *(u32 *)(r10 - 4) */ @@ -366,18 +355,11 @@ static int xsk_create_bpf_maps(struct xsk_socket *xsk) if (max_queues < 0) return max_queues; - fd = bpf_create_map_name(BPF_MAP_TYPE_ARRAY, "qidconf_map", + fd = bpf_create_map_name(BPF_MAP_TYPE_ARRAY, "xsks_map", sizeof(int), sizeof(int), max_queues, 0); if (fd < 0) return fd; - xsk->qidconf_map_fd = fd; - fd = bpf_create_map_name(BPF_MAP_TYPE_XSKMAP, "xsks_map", - sizeof(int), sizeof(int), max_queues, 0); - if (fd < 0) { - close(xsk->qidconf_map_fd); - return fd; - } xsk->xsks_map_fd = fd; return 0; @@ -385,10 +367,8 @@ static int xsk_create_bpf_maps(struct xsk_socket *xsk) static void xsk_delete_bpf_maps(struct xsk_socket *xsk) { - close(xsk->qidconf_map_fd); + bpf_map_delete_elem(xsk->xsks_map_fd, &xsk->queue_id); close(xsk->xsks_map_fd); - xsk->qidconf_map_fd = -1; - xsk->xsks_map_fd = -1; } static int xsk_lookup_bpf_maps(struct xsk_socket *xsk) @@ -417,10 +397,9 @@ static int xsk_lookup_bpf_maps(struct xsk_socket *xsk) if (err) goto out_map_ids; - for (i = 0; i < prog_info.nr_map_ids; i++) { - if (xsk->qidconf_map_fd != -1 && xsk->xsks_map_fd != -1) - break; + 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; @@ -431,11 +410,6 @@ static int xsk_lookup_bpf_maps(struct xsk_socket *xsk) continue; } - if (!strcmp(map_info.name, "qidconf_map")) { - xsk->qidconf_map_fd = fd; - continue; - } - if (!strcmp(map_info.name, "xsks_map")) { xsk->xsks_map_fd = fd; continue; @@ -445,40 +419,18 @@ static int xsk_lookup_bpf_maps(struct xsk_socket *xsk) } err = 0; - if (xsk->qidconf_map_fd < 0 || xsk->xsks_map_fd < 0) { + if (xsk->xsks_map_fd == -1) err = -ENOENT; - xsk_delete_bpf_maps(xsk); - } out_map_ids: free(map_ids); return err; } -static void xsk_clear_bpf_maps(struct xsk_socket *xsk) -{ - int qid = false; - - bpf_map_update_elem(xsk->qidconf_map_fd, &xsk->queue_id, &qid, 0); - bpf_map_delete_elem(xsk->xsks_map_fd, &xsk->queue_id); -} - static int xsk_set_bpf_maps(struct xsk_socket *xsk) { - int qid = true, fd = xsk->fd, err; - - err = bpf_map_update_elem(xsk->qidconf_map_fd, &xsk->queue_id, &qid, 0); - if (err) - goto out; - - err = bpf_map_update_elem(xsk->xsks_map_fd, &xsk->queue_id, &fd, 0); - if (err) - goto out; - - return 0; -out: - xsk_clear_bpf_maps(xsk); - return err; + 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) @@ -514,6 +466,7 @@ static int xsk_setup_xdp_prog(struct xsk_socket *xsk) out_load: close(xsk->prog_fd); + xsk->prog_fd = -1; out_maps: xsk_delete_bpf_maps(xsk); return err; @@ -643,9 +596,7 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname, goto out_mmap_tx; } - xsk->qidconf_map_fd = -1; - xsk->xsks_map_fd = -1; - + xsk->prog_fd = -1; if (!(xsk->config.libbpf_flags & XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD)) { err = xsk_setup_xdp_prog(xsk); if (err) @@ -708,8 +659,10 @@ void xsk_socket__delete(struct xsk_socket *xsk) if (!xsk) return; - xsk_clear_bpf_maps(xsk); - xsk_delete_bpf_maps(xsk); + if (xsk->prog_fd != -1) { + xsk_delete_bpf_maps(xsk); + close(xsk->prog_fd); + } optlen = sizeof(off); err = getsockopt(xsk->fd, SOL_XDP, XDP_MMAP_OFFSETS, &off, &optlen); -- 2.17.1 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH v2 bpf-next 2/2] libbpf: remove qidconf and better support external bpf programs. 2019-05-30 18:57 ` [PATCH v2 bpf-next 2/2] libbpf: remove qidconf and better support external bpf programs Jonathan Lemon @ 2019-05-31 11:55 ` Björn Töpel 2019-05-31 16:30 ` Jonathan Lemon 0 siblings, 1 reply; 7+ messages in thread From: Björn Töpel @ 2019-05-31 11:55 UTC (permalink / raw) To: Jonathan Lemon, netdev, magnus.karlsson; +Cc: kernel-team, bpf On 2019-05-30 20:57, Jonathan Lemon wrote: > Use the recent change to XSKMAP bpf_map_lookup_elem() to test if > there is a xsk present in the map instead of duplicating the work > with qidconf. > > Fix things so callers using XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD > bypass any internal bpf maps, so xsk_socket__{create|delete} works > properly. > > Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com> > --- > tools/lib/bpf/xsk.c | 79 +++++++++------------------------------------ > 1 file changed, 16 insertions(+), 63 deletions(-) > > diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c > index 38667b62f1fe..a150493d51ec 100644 > --- a/tools/lib/bpf/xsk.c > +++ b/tools/lib/bpf/xsk.c > @@ -60,10 +60,8 @@ struct xsk_socket { > struct xsk_umem *umem; > struct xsk_socket_config config; > int fd; > - int xsks_map; > int ifindex; > int prog_fd; > - int qidconf_map_fd; > int xsks_map_fd; > __u32 queue_id; > char ifname[IFNAMSIZ]; > @@ -265,15 +263,11 @@ static int xsk_load_xdp_prog(struct xsk_socket *xsk) > /* This is the C-program: > * SEC("xdp_sock") int xdp_sock_prog(struct xdp_md *ctx) > * { > - * int *qidconf, index = ctx->rx_queue_index; > + * 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. > - * qidconf = bpf_map_lookup_elem(&qidconf_map, &index); > - * if (!qidconf) > - * return XDP_ABORTED; > - * > - * if (*qidconf) > + * if (bpf_map_lookup_elem(&xsks_map, &index)) > * return bpf_redirect_map(&xsks_map, index, 0); > * > * return XDP_PASS; > @@ -286,15 +280,10 @@ static int xsk_load_xdp_prog(struct xsk_socket *xsk) > 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->qidconf_map_fd), > + 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, 0), > - /* if r1 == 0 goto +8 */ > - BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 8), > BPF_MOV32_IMM(BPF_REG_0, 2), > - /* r1 = *(u32 *)(r1 + 0) */ > - BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_1, 0), > /* if r1 == 0 goto +5 */ > BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 5), > /* r2 = *(u32 *)(r10 - 4) */ > @@ -366,18 +355,11 @@ static int xsk_create_bpf_maps(struct xsk_socket *xsk) > if (max_queues < 0) > return max_queues; > > - fd = bpf_create_map_name(BPF_MAP_TYPE_ARRAY, "qidconf_map", > + fd = bpf_create_map_name(BPF_MAP_TYPE_ARRAY, "xsks_map", > sizeof(int), sizeof(int), max_queues, 0); > if (fd < 0) > return fd; > - xsk->qidconf_map_fd = fd; > > - fd = bpf_create_map_name(BPF_MAP_TYPE_XSKMAP, "xsks_map", > - sizeof(int), sizeof(int), max_queues, 0); > - if (fd < 0) { > - close(xsk->qidconf_map_fd); > - return fd; > - } Uhm, you're removing the XSKMAP here, replacing it with an ARRAY. Have you run this? Björn > xsk->xsks_map_fd = fd; > > return 0; > @@ -385,10 +367,8 @@ static int xsk_create_bpf_maps(struct xsk_socket *xsk) > > static void xsk_delete_bpf_maps(struct xsk_socket *xsk) > { > - close(xsk->qidconf_map_fd); > + bpf_map_delete_elem(xsk->xsks_map_fd, &xsk->queue_id); > close(xsk->xsks_map_fd); > - xsk->qidconf_map_fd = -1; > - xsk->xsks_map_fd = -1; > } > > static int xsk_lookup_bpf_maps(struct xsk_socket *xsk) > @@ -417,10 +397,9 @@ static int xsk_lookup_bpf_maps(struct xsk_socket *xsk) > if (err) > goto out_map_ids; > > - for (i = 0; i < prog_info.nr_map_ids; i++) { > - if (xsk->qidconf_map_fd != -1 && xsk->xsks_map_fd != -1) > - break; > + 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; > @@ -431,11 +410,6 @@ static int xsk_lookup_bpf_maps(struct xsk_socket *xsk) > continue; > } > > - if (!strcmp(map_info.name, "qidconf_map")) { > - xsk->qidconf_map_fd = fd; > - continue; > - } > - > if (!strcmp(map_info.name, "xsks_map")) { > xsk->xsks_map_fd = fd; > continue; > @@ -445,40 +419,18 @@ static int xsk_lookup_bpf_maps(struct xsk_socket *xsk) > } > > err = 0; > - if (xsk->qidconf_map_fd < 0 || xsk->xsks_map_fd < 0) { > + if (xsk->xsks_map_fd == -1) > err = -ENOENT; > - xsk_delete_bpf_maps(xsk); > - } > > out_map_ids: > free(map_ids); > return err; > } > > -static void xsk_clear_bpf_maps(struct xsk_socket *xsk) > -{ > - int qid = false; > - > - bpf_map_update_elem(xsk->qidconf_map_fd, &xsk->queue_id, &qid, 0); > - bpf_map_delete_elem(xsk->xsks_map_fd, &xsk->queue_id); > -} > - > static int xsk_set_bpf_maps(struct xsk_socket *xsk) > { > - int qid = true, fd = xsk->fd, err; > - > - err = bpf_map_update_elem(xsk->qidconf_map_fd, &xsk->queue_id, &qid, 0); > - if (err) > - goto out; > - > - err = bpf_map_update_elem(xsk->xsks_map_fd, &xsk->queue_id, &fd, 0); > - if (err) > - goto out; > - > - return 0; > -out: > - xsk_clear_bpf_maps(xsk); > - return err; > + 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) > @@ -514,6 +466,7 @@ static int xsk_setup_xdp_prog(struct xsk_socket *xsk) > > out_load: > close(xsk->prog_fd); > + xsk->prog_fd = -1; > out_maps: > xsk_delete_bpf_maps(xsk); > return err; > @@ -643,9 +596,7 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname, > goto out_mmap_tx; > } > > - xsk->qidconf_map_fd = -1; > - xsk->xsks_map_fd = -1; > - > + xsk->prog_fd = -1; > if (!(xsk->config.libbpf_flags & XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD)) { > err = xsk_setup_xdp_prog(xsk); > if (err) > @@ -708,8 +659,10 @@ void xsk_socket__delete(struct xsk_socket *xsk) > if (!xsk) > return; > > - xsk_clear_bpf_maps(xsk); > - xsk_delete_bpf_maps(xsk); > + if (xsk->prog_fd != -1) { > + xsk_delete_bpf_maps(xsk); > + close(xsk->prog_fd); > + } > > optlen = sizeof(off); > err = getsockopt(xsk->fd, SOL_XDP, XDP_MMAP_OFFSETS, &off, &optlen); > ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH v2 bpf-next 2/2] libbpf: remove qidconf and better support external bpf programs. 2019-05-31 11:55 ` Björn Töpel @ 2019-05-31 16:30 ` Jonathan Lemon 0 siblings, 0 replies; 7+ messages in thread From: Jonathan Lemon @ 2019-05-31 16:30 UTC (permalink / raw) To: Björn Töpel; +Cc: netdev, magnus.karlsson, kernel-team, bpf On 31 May 2019, at 4:55, Björn Töpel wrote: > On 2019-05-30 20:57, Jonathan Lemon wrote: >> Use the recent change to XSKMAP bpf_map_lookup_elem() to test if >> there is a xsk present in the map instead of duplicating the work >> with qidconf. >> >> Fix things so callers using XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD >> bypass any internal bpf maps, so xsk_socket__{create|delete} works >> properly. >> >> Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com> >> --- >> tools/lib/bpf/xsk.c | 79 >> +++++++++------------------------------------ >> 1 file changed, 16 insertions(+), 63 deletions(-) >> >> diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c >> index 38667b62f1fe..a150493d51ec 100644 >> --- a/tools/lib/bpf/xsk.c >> +++ b/tools/lib/bpf/xsk.c >> @@ -60,10 +60,8 @@ struct xsk_socket { >> struct xsk_umem *umem; >> struct xsk_socket_config config; >> int fd; >> - int xsks_map; >> int ifindex; >> int prog_fd; >> - int qidconf_map_fd; >> int xsks_map_fd; >> __u32 queue_id; >> char ifname[IFNAMSIZ]; >> @@ -265,15 +263,11 @@ static int xsk_load_xdp_prog(struct xsk_socket >> *xsk) >> /* This is the C-program: >> * SEC("xdp_sock") int xdp_sock_prog(struct xdp_md *ctx) >> * { >> - * int *qidconf, index = ctx->rx_queue_index; >> + * 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. >> - * qidconf = bpf_map_lookup_elem(&qidconf_map, &index); >> - * if (!qidconf) >> - * return XDP_ABORTED; >> - * >> - * if (*qidconf) >> + * if (bpf_map_lookup_elem(&xsks_map, &index)) >> * return bpf_redirect_map(&xsks_map, index, 0); >> * >> * return XDP_PASS; >> @@ -286,15 +280,10 @@ static int xsk_load_xdp_prog(struct xsk_socket >> *xsk) >> 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->qidconf_map_fd), >> + 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, 0), >> - /* if r1 == 0 goto +8 */ >> - BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 8), >> BPF_MOV32_IMM(BPF_REG_0, 2), >> - /* r1 = *(u32 *)(r1 + 0) */ >> - BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_1, 0), >> /* if r1 == 0 goto +5 */ >> BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 5), >> /* r2 = *(u32 *)(r10 - 4) */ >> @@ -366,18 +355,11 @@ static int xsk_create_bpf_maps(struct >> xsk_socket *xsk) >> if (max_queues < 0) >> return max_queues; >> - fd = bpf_create_map_name(BPF_MAP_TYPE_ARRAY, "qidconf_map", >> + fd = bpf_create_map_name(BPF_MAP_TYPE_ARRAY, "xsks_map", >> sizeof(int), sizeof(int), max_queues, 0); >> if (fd < 0) >> return fd; >> - xsk->qidconf_map_fd = fd; >> - fd = bpf_create_map_name(BPF_MAP_TYPE_XSKMAP, "xsks_map", >> - sizeof(int), sizeof(int), max_queues, 0); >> - if (fd < 0) { >> - close(xsk->qidconf_map_fd); >> - return fd; >> - } > > Uhm, you're removing the XSKMAP here, replacing it with an ARRAY. Have > you run this? Err... I've been running the code, but this version is wrong. Let me respin this. -- Jonathan ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH v2 bpf-next 1/2] bpf: Allow bpf_map_lookup_elem() on an xskmap 2019-05-30 18:57 [PATCH v2 bpf-next 1/2] bpf: Allow bpf_map_lookup_elem() on an xskmap Jonathan Lemon 2019-05-30 18:57 ` [PATCH v2 bpf-next 2/2] libbpf: remove qidconf and better support external bpf programs Jonathan Lemon @ 2019-05-31 11:49 ` Björn Töpel 2019-05-31 16:27 ` Jonathan Lemon 1 sibling, 1 reply; 7+ messages in thread From: Björn Töpel @ 2019-05-31 11:49 UTC (permalink / raw) To: Jonathan Lemon, netdev, magnus.karlsson; +Cc: kernel-team, bpf On 2019-05-30 20:57, Jonathan Lemon wrote: > Currently, the AF_XDP code uses a separate map in order to > determine if an xsk is bound to a queue. Instead of doing this, > have bpf_map_lookup_elem() return the queue_id, as a way of > indicating that there is a valid entry at the map index. > > Rearrange some xdp_sock members to eliminate structure holes. > > Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com> > --- > include/net/xdp_sock.h | 6 +++--- > kernel/bpf/verifier.c | 6 +++++- > kernel/bpf/xskmap.c | 4 +++- > .../selftests/bpf/verifier/prevent_map_lookup.c | 15 --------------- > 4 files changed, 11 insertions(+), 20 deletions(-) > > diff --git a/include/net/xdp_sock.h b/include/net/xdp_sock.h > index d074b6d60f8a..7d84b1da43d2 100644 > --- a/include/net/xdp_sock.h > +++ b/include/net/xdp_sock.h > @@ -57,12 +57,12 @@ struct xdp_sock { > struct net_device *dev; > struct xdp_umem *umem; > struct list_head flush_node; > - u16 queue_id; > - struct xsk_queue *tx ____cacheline_aligned_in_smp; > - struct list_head list; > + u32 queue_id; Why the increase of size? > bool zc; > /* Protects multiple processes in the control path */ > struct mutex mutex; > + struct xsk_queue *tx ____cacheline_aligned_in_smp; > + struct list_head list; > /* Mutual exclusion of NAPI TX thread and sendmsg error paths > * in the SKB destructor callback. > */ > diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c > index 2778417e6e0c..91c730f85e92 100644 > --- a/kernel/bpf/verifier.c > +++ b/kernel/bpf/verifier.c > @@ -2905,10 +2905,14 @@ static int check_map_func_compatibility(struct bpf_verifier_env *env, > * appear. > */ > case BPF_MAP_TYPE_CPUMAP: > - case BPF_MAP_TYPE_XSKMAP: > if (func_id != BPF_FUNC_redirect_map) > goto error; > break; > + case BPF_MAP_TYPE_XSKMAP: > + if (func_id != BPF_FUNC_redirect_map && > + func_id != BPF_FUNC_map_lookup_elem) > + goto error; > + break; > case BPF_MAP_TYPE_ARRAY_OF_MAPS: > case BPF_MAP_TYPE_HASH_OF_MAPS: > if (func_id != BPF_FUNC_map_lookup_elem) > diff --git a/kernel/bpf/xskmap.c b/kernel/bpf/xskmap.c > index 686d244e798d..249b22089014 100644 > --- a/kernel/bpf/xskmap.c > +++ b/kernel/bpf/xskmap.c > @@ -154,7 +154,9 @@ void __xsk_map_flush(struct bpf_map *map) > > static void *xsk_map_lookup_elem(struct bpf_map *map, void *key) > { > - return ERR_PTR(-EOPNOTSUPP); > + struct xdp_sock *xs = __xsk_map_lookup_elem(map, *(u32 *)key); > + > + return xs ? &xs->queue_id : NULL; I like this! I haven't taken it for a spin, but still: Acked-by: Björn Töpel <bjorn.topel@intel.com> > } > > static int xsk_map_update_elem(struct bpf_map *map, void *key, void *value, > diff --git a/tools/testing/selftests/bpf/verifier/prevent_map_lookup.c b/tools/testing/selftests/bpf/verifier/prevent_map_lookup.c > index bbdba990fefb..da7a4b37cb98 100644 > --- a/tools/testing/selftests/bpf/verifier/prevent_map_lookup.c > +++ b/tools/testing/selftests/bpf/verifier/prevent_map_lookup.c > @@ -28,21 +28,6 @@ > .errstr = "cannot pass map_type 18 into func bpf_map_lookup_elem", > .prog_type = BPF_PROG_TYPE_SOCK_OPS, > }, > -{ > - "prevent map lookup in xskmap", > - .insns = { > - BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0), > - BPF_MOV64_REG(BPF_REG_2, BPF_REG_10), > - BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8), > - BPF_LD_MAP_FD(BPF_REG_1, 0), > - BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem), > - BPF_EXIT_INSN(), > - }, > - .fixup_map_xskmap = { 3 }, > - .result = REJECT, > - .errstr = "cannot pass map_type 17 into func bpf_map_lookup_elem", > - .prog_type = BPF_PROG_TYPE_XDP, > -}, > { > "prevent map lookup in stack trace", > .insns = { > ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH v2 bpf-next 1/2] bpf: Allow bpf_map_lookup_elem() on an xskmap 2019-05-31 11:49 ` [PATCH v2 bpf-next 1/2] bpf: Allow bpf_map_lookup_elem() on an xskmap Björn Töpel @ 2019-05-31 16:27 ` Jonathan Lemon 2019-05-31 17:13 ` Björn Töpel 0 siblings, 1 reply; 7+ messages in thread From: Jonathan Lemon @ 2019-05-31 16:27 UTC (permalink / raw) To: Björn Töpel; +Cc: netdev, magnus.karlsson, kernel-team, bpf On 31 May 2019, at 4:49, Björn Töpel wrote: > On 2019-05-30 20:57, Jonathan Lemon wrote: >> Currently, the AF_XDP code uses a separate map in order to >> determine if an xsk is bound to a queue. Instead of doing this, >> have bpf_map_lookup_elem() return the queue_id, as a way of >> indicating that there is a valid entry at the map index. >> >> Rearrange some xdp_sock members to eliminate structure holes. >> >> Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com> >> --- >> include/net/xdp_sock.h | 6 +++--- >> kernel/bpf/verifier.c | 6 +++++- >> kernel/bpf/xskmap.c | 4 +++- >> .../selftests/bpf/verifier/prevent_map_lookup.c | 15 --------------- >> 4 files changed, 11 insertions(+), 20 deletions(-) >> >> diff --git a/include/net/xdp_sock.h b/include/net/xdp_sock.h >> index d074b6d60f8a..7d84b1da43d2 100644 >> --- a/include/net/xdp_sock.h >> +++ b/include/net/xdp_sock.h >> @@ -57,12 +57,12 @@ struct xdp_sock { >> struct net_device *dev; >> struct xdp_umem *umem; >> struct list_head flush_node; >> - u16 queue_id; >> - struct xsk_queue *tx ____cacheline_aligned_in_smp; >> - struct list_head list; >> + u32 queue_id; > > Why the increase of size? Currently xskmaps are defined as size=4, so the returned pointer for bpf must have that many bytes. I was kicking around the idea of using a union and returning { qid, zc }, but Alexei pointed out that doesn't make a good API. Besides, queue_index in struct xdp_rxq_info is already a u32. -- Jonathan ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH v2 bpf-next 1/2] bpf: Allow bpf_map_lookup_elem() on an xskmap 2019-05-31 16:27 ` Jonathan Lemon @ 2019-05-31 17:13 ` Björn Töpel 0 siblings, 0 replies; 7+ messages in thread From: Björn Töpel @ 2019-05-31 17:13 UTC (permalink / raw) To: Jonathan Lemon Cc: Björn Töpel, Netdev, Karlsson, Magnus, Kernel Team, bpf On Fri, 31 May 2019 at 18:27, Jonathan Lemon <jonathan.lemon@gmail.com> wrote: > > On 31 May 2019, at 4:49, Björn Töpel wrote: > > > On 2019-05-30 20:57, Jonathan Lemon wrote: > >> Currently, the AF_XDP code uses a separate map in order to > >> determine if an xsk is bound to a queue. Instead of doing this, > >> have bpf_map_lookup_elem() return the queue_id, as a way of > >> indicating that there is a valid entry at the map index. > >> > >> Rearrange some xdp_sock members to eliminate structure holes. > >> > >> Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com> > >> --- > >> include/net/xdp_sock.h | 6 +++--- > >> kernel/bpf/verifier.c | 6 +++++- > >> kernel/bpf/xskmap.c | 4 +++- > >> .../selftests/bpf/verifier/prevent_map_lookup.c | 15 --------------- > >> 4 files changed, 11 insertions(+), 20 deletions(-) > >> > >> diff --git a/include/net/xdp_sock.h b/include/net/xdp_sock.h > >> index d074b6d60f8a..7d84b1da43d2 100644 > >> --- a/include/net/xdp_sock.h > >> +++ b/include/net/xdp_sock.h > >> @@ -57,12 +57,12 @@ struct xdp_sock { > >> struct net_device *dev; > >> struct xdp_umem *umem; > >> struct list_head flush_node; > >> - u16 queue_id; > >> - struct xsk_queue *tx ____cacheline_aligned_in_smp; > >> - struct list_head list; > >> + u32 queue_id; > > > > Why the increase of size? > > Currently xskmaps are defined as size=4, so the returned pointer for > bpf must have that many bytes. I was kicking around the idea of using > a union and returning { qid, zc }, but Alexei pointed out that doesn't > make a good API. > > Besides, queue_index in struct xdp_rxq_info is already a u32. (Resending w/o HTML from mobile client.) Makes sense. Thanks for clarifying! Björn > -- > Jonathan > ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2019-05-31 17:13 UTC | newest] Thread overview: 7+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2019-05-30 18:57 [PATCH v2 bpf-next 1/2] bpf: Allow bpf_map_lookup_elem() on an xskmap Jonathan Lemon 2019-05-30 18:57 ` [PATCH v2 bpf-next 2/2] libbpf: remove qidconf and better support external bpf programs Jonathan Lemon 2019-05-31 11:55 ` Björn Töpel 2019-05-31 16:30 ` Jonathan Lemon 2019-05-31 11:49 ` [PATCH v2 bpf-next 1/2] bpf: Allow bpf_map_lookup_elem() on an xskmap Björn Töpel 2019-05-31 16:27 ` Jonathan Lemon 2019-05-31 17:13 ` Björn Töpel
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