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Date: Tue, 13 Jul 2021 23:57:45 +0300 From: Vasily Averin <vvs@...tuozzo.com> To: "David S. Miller" <davem@...emloft.net>, Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>, David Ahern <dsahern@...nel.org>, Jakub Kicinski <kuba@...nel.org>, Eric Dumazet <eric.dumazet@...il.com> Cc: netdev@...r.kernel.org, Joerg Reuter <jreuter@...na.de>, Ralf Baechle <ralf@...ux-mips.org>, linux-hams@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, Martin KaFai Lau <kafai@...com>, Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>, KP Singh <kpsingh@...nel.org>, bpf@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH NET v2 0/7] skbuff: introduce skb_expand_head() currently if skb does not have enough headroom skb_realloc_headrom is called. It is not optimal because it creates new skb. Unlike skb_realloc_headroom, new helper skb_учзфтв_head does not allocate a new skb if possible; copies skb->sk on new skb when as needed and frees original skb in case of failures. This helps to simplify ip[6]_finish_output2(), ip6_xmit() and a few other functions in vrf, ax25 and bpf. There are few other cases where this helper can be used but they require an additional investigations. v2 changes: - helper's name was changed to skb_expand_head - fixed few mistakes inside skb_expand_head(): skb_set_owner_w should set sk on nskb kfree was replaced by kfree_skb() improved warning message - added minor refactoring in changed functions in vrf and bpf patches - removed kfree_skb() in ax25_rt_build_path caller ax25_ip_xmit NB: patch "ipv6: use skb_expand_head in ip6_finish_output2" depends on patch "ipv6: allocate enough headroom in ip6_finish_output2()" submitted separately https://lkml.org/lkml/2021/7/12/732 Vasily Averin (7): skbuff: introduce skb_expand_head() ipv6: use skb_expand_head in ip6_finish_output2 ipv6: use skb_expand_head in ip6_xmit refactoring ipv4: use skb_expand_head in ip_finish_output2 vrf: use skb_expand_head in vrf_finish_output ax25: use skb_expand_head bpf: use skb_expand_head in bpf_out_neigh_v4/6 drivers/net/vrf.c | 21 +++++--------- include/linux/skbuff.h | 1 + net/ax25/ax25_out.c | 12 ++------ net/ax25/ax25_route.c | 13 ++------- net/core/filter.c | 27 ++++------------- net/core/skbuff.c | 42 +++++++++++++++++++++++++++ net/ipv4/ip_output.c | 13 ++------- net/ipv6/ip6_output.c | 78 +++++++++++++++++--------------------------------- 8 files changed, 90 insertions(+), 117 deletions(-) -- 1.8.3.1
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