Commit c2f2cdbe authored by Lorenzo Bianconi's avatar Lorenzo Bianconi Committed by Alexei Starovoitov
Browse files

bpf: introduce BPF_F_XDP_HAS_FRAGS flag in prog_flags loading the ebpf program 



Introduce BPF_F_XDP_HAS_FRAGS and the related field in bpf_prog_aux
in order to notify the driver the loaded program support xdp frags.

Acked-by: default avatarToke Hoiland-Jorgensen <toke@redhat.com>
Acked-by: default avatarJohn Fastabend <john.fastabend@gmail.com>
Signed-off-by: default avatarLorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/db2e8075b7032a356003f407d1b0deb99adaa0ed.1642758637.git.lorenzo@kernel.org


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent c41ced02

include/linux/bpf.h

+1 −0
Original line number Diff line number Diff line
@@ -933,6 +933,7 @@ struct bpf_prog_aux { 
	bool func_proto_unreliable;

	bool sleepable;

	bool tail_call_reachable;

	bool xdp_has_frags;

	struct hlist_node tramp_hlist;

	/* BTF_KIND_FUNC_PROTO for valid attach_btf_id */

	const struct btf_type *attach_func_proto;

include/uapi/linux/bpf.h

+5 −0
Original line number Diff line number Diff line
@@ -1113,6 +1113,11 @@ enum bpf_link_type { 
 */

#define BPF_F_SLEEPABLE		(1U << 4)



/* If BPF_F_XDP_HAS_FRAGS is used in BPF_PROG_LOAD command, the loaded program

 * fully support xdp frags.

 */

#define BPF_F_XDP_HAS_FRAGS	(1U << 5)



/* When BPF ldimm64's insn[0].src_reg != 0 then this can have

 * the following extensions:

 *

kernel/bpf/syscall.c

+3 −1
Original line number Diff line number Diff line
@@ -2217,7 +2217,8 @@ static int bpf_prog_load(union bpf_attr *attr, bpfptr_t uattr) 
				 BPF_F_ANY_ALIGNMENT |

				 BPF_F_TEST_STATE_FREQ |

				 BPF_F_SLEEPABLE |

				 BPF_F_TEST_RND_HI32))

				 BPF_F_TEST_RND_HI32 |

				 BPF_F_XDP_HAS_FRAGS))

		return -EINVAL;



	if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
@@ -2303,6 +2304,7 @@ static int bpf_prog_load(union bpf_attr *attr, bpfptr_t uattr) 
	prog->aux->dst_prog = dst_prog;

	prog->aux->offload_requested = !!attr->prog_ifindex;

	prog->aux->sleepable = attr->prog_flags & BPF_F_SLEEPABLE;

	prog->aux->xdp_has_frags = attr->prog_flags & BPF_F_XDP_HAS_FRAGS;



	err = security_bpf_prog_alloc(prog->aux);

	if (err)

tools/include/uapi/linux/bpf.h

+5 −0
Original line number Diff line number Diff line
@@ -1113,6 +1113,11 @@ enum bpf_link_type { 
 */

#define BPF_F_SLEEPABLE		(1U << 4)



/* If BPF_F_XDP_HAS_FRAGS is used in BPF_PROG_LOAD command, the loaded program

 * fully support xdp frags.

 */

#define BPF_F_XDP_HAS_FRAGS	(1U << 5)



/* When BPF ldimm64's insn[0].src_reg != 0 then this can have

 * the following extensions:

 *