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Message-ID: <Zh01zlwo0H1BmMug@hog>
Date: Mon, 15 Apr 2024 16:12:30 +0200
From: Sabrina Dubroca <sd@...asysnail.net>
To: Steffen Klassert <steffen.klassert@...unet.com>
Cc: netdev@...r.kernel.org, devel@...ux-ipsec.org,
Paul Wouters <paul@...ats.ca>,
Antony Antony <antony.antony@...unet.com>,
Tobias Brunner <tobias@...ongswan.org>, Daniel Xu <dxu@...uu.xyz>
Subject: Re: [PATCH ipsec-next 1/3] xfrm: Add support for per cpu xfrm state
handling.
2024-04-12, 08:05:51 +0200, Steffen Klassert wrote:
> diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
> index 0c306473a79d..b41b5dd72d8e 100644
> --- a/net/xfrm/xfrm_state.c
> +++ b/net/xfrm/xfrm_state.c
[...]
> @@ -1096,6 +1098,9 @@ static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
> struct xfrm_state **best, int *acq_in_progress,
> int *error)
> {
> + unsigned int pcpu_id = get_cpu();
> + put_cpu();
That looks really strange to me. Is it safe? If it is, I guess you
could just use smp_processor_id(), since you don't get anything out of
the extra preempt_disable/enable pair.
(same in xfrm_state_find)
[...]
> @@ -2458,6 +2478,8 @@ static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct
> err = xfrm_if_id_put(skb, x->if_id);
> if (err)
> goto out_cancel;
> + if (x->pcpu_num != UINT_MAX)
> + err = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
Missing the corresponding change to xfrm_aevent_msgsize?
[...]
> @@ -3049,6 +3078,7 @@ const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
> [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 },
> [XFRMA_IF_ID] = { .type = NLA_U32 },
> [XFRMA_MTIMER_THRESH] = { .type = NLA_U32 },
> + [XFRMA_SA_PCPU] = { .type = NLA_U32 },
What about xfrm_compat? Don't we need to add XFRMA_SA_PCPU to
compat_policy, and then some changes to the translators?
[...]
> @@ -3216,6 +3246,11 @@ static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct
> err = xfrm_if_id_put(skb, x->if_id);
> if (err)
> return err;
> + if (x->pcpu_num != UINT_MAX) {
> + err = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
Missing the corresponding change to xfrm_expire_msgsize?
[...]
> @@ -3453,6 +3490,8 @@ static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
> err = xfrm_if_id_put(skb, xp->if_id);
> if (!err && xp->xdo.dev)
> err = copy_user_offload(&xp->xdo, skb);
> + if (!err && x->pcpu_num != UINT_MAX)
> + err = nla_put_u32(skb, XFRMA_SA_PCPU, x->pcpu_num);
Missing the corresponding change to xfrm_acquire_msgsize?
--
Sabrina
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