* [PATCH bpf-next] net: veth: account total xdp_frame len running ndo_xdp_xmit
@ 2022-02-01 10:46 Lorenzo Bianconi
2022-02-08 2:39 ` Alexei Starovoitov
0 siblings, 1 reply; 3+ messages in thread
From: Lorenzo Bianconi @ 2022-02-01 10:46 UTC (permalink / raw)
To: bpf
Cc: netdev, lorenzo.bianconi, davem, kuba, ast, daniel, brouer, toke,
andrii, pabeni, toshiaki.makita1
Introduce xdp_get_frame_len utility routine to get the xdp_frame full
length and account total frame size running XDP_REDIRECT of a
non-linear xdp frame into a veth device.
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
drivers/net/veth.c | 4 ++--
include/net/xdp.h | 14 ++++++++++++++
2 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 354a963075c5..22ecaf8b8f98 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -493,7 +493,7 @@ static int veth_xdp_xmit(struct net_device *dev, int n,
struct xdp_frame *frame = frames[i];
void *ptr = veth_xdp_to_ptr(frame);
- if (unlikely(frame->len > max_len ||
+ if (unlikely(xdp_get_frame_len(frame) > max_len ||
__ptr_ring_produce(&rq->xdp_ring, ptr)))
break;
nxmit++;
@@ -854,7 +854,7 @@ static int veth_xdp_rcv(struct veth_rq *rq, int budget,
/* ndo_xdp_xmit */
struct xdp_frame *frame = veth_ptr_to_xdp(ptr);
- stats->xdp_bytes += frame->len;
+ stats->xdp_bytes += xdp_get_frame_len(frame);
frame = veth_xdp_rcv_one(rq, frame, bq, stats);
if (frame) {
/* XDP_PASS */
diff --git a/include/net/xdp.h b/include/net/xdp.h
index b7721c3e4d1f..04c852c7a77f 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -343,6 +343,20 @@ static inline void xdp_release_frame(struct xdp_frame *xdpf)
__xdp_release_frame(xdpf->data, mem);
}
+static __always_inline unsigned int xdp_get_frame_len(struct xdp_frame *xdpf)
+{
+ struct skb_shared_info *sinfo;
+ unsigned int len = xdpf->len;
+
+ if (likely(!xdp_frame_has_frags(xdpf)))
+ goto out;
+
+ sinfo = xdp_get_shared_info_from_frame(xdpf);
+ len += sinfo->xdp_frags_size;
+out:
+ return len;
+}
+
int __xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq,
struct net_device *dev, u32 queue_index,
unsigned int napi_id, u32 frag_size);
--
2.34.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH bpf-next] net: veth: account total xdp_frame len running ndo_xdp_xmit
2022-02-01 10:46 [PATCH bpf-next] net: veth: account total xdp_frame len running ndo_xdp_xmit Lorenzo Bianconi
@ 2022-02-08 2:39 ` Alexei Starovoitov
2022-02-10 17:34 ` Lorenzo Bianconi
0 siblings, 1 reply; 3+ messages in thread
From: Alexei Starovoitov @ 2022-02-08 2:39 UTC (permalink / raw)
To: Lorenzo Bianconi
Cc: bpf, Network Development, Lorenzo Bianconi, David S. Miller,
Jakub Kicinski, Alexei Starovoitov, Daniel Borkmann,
Jesper Dangaard Brouer, Toke Høiland-Jørgensen,
Andrii Nakryiko, Paolo Abeni, Toshiaki Makita
On Tue, Feb 1, 2022 at 2:46 AM Lorenzo Bianconi <lorenzo@kernel.org> wrote:
>
> Introduce xdp_get_frame_len utility routine to get the xdp_frame full
> length and account total frame size running XDP_REDIRECT of a
> non-linear xdp frame into a veth device.
>
> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
> ---
> drivers/net/veth.c | 4 ++--
> include/net/xdp.h | 14 ++++++++++++++
> 2 files changed, 16 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/veth.c b/drivers/net/veth.c
> index 354a963075c5..22ecaf8b8f98 100644
> --- a/drivers/net/veth.c
> +++ b/drivers/net/veth.c
> @@ -493,7 +493,7 @@ static int veth_xdp_xmit(struct net_device *dev, int n,
> struct xdp_frame *frame = frames[i];
> void *ptr = veth_xdp_to_ptr(frame);
>
> - if (unlikely(frame->len > max_len ||
> + if (unlikely(xdp_get_frame_len(frame) > max_len ||
> __ptr_ring_produce(&rq->xdp_ring, ptr)))
> break;
Looks correct, but could you explain what happens without this fix?
Any other drivers might have the same issue?
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH bpf-next] net: veth: account total xdp_frame len running ndo_xdp_xmit
2022-02-08 2:39 ` Alexei Starovoitov
@ 2022-02-10 17:34 ` Lorenzo Bianconi
0 siblings, 0 replies; 3+ messages in thread
From: Lorenzo Bianconi @ 2022-02-10 17:34 UTC (permalink / raw)
To: Alexei Starovoitov
Cc: bpf, Network Development, Lorenzo Bianconi, David S. Miller,
Jakub Kicinski, Alexei Starovoitov, Daniel Borkmann,
Jesper Dangaard Brouer, Toke Høiland-Jørgensen,
Andrii Nakryiko, Paolo Abeni, Toshiaki Makita
[-- Attachment #1: Type: text/plain, Size: 1753 bytes --]
> On Tue, Feb 1, 2022 at 2:46 AM Lorenzo Bianconi <lorenzo@kernel.org> wrote:
> >
> > Introduce xdp_get_frame_len utility routine to get the xdp_frame full
> > length and account total frame size running XDP_REDIRECT of a
> > non-linear xdp frame into a veth device.
> >
> > Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
> > ---
> > drivers/net/veth.c | 4 ++--
> > include/net/xdp.h | 14 ++++++++++++++
> > 2 files changed, 16 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/net/veth.c b/drivers/net/veth.c
> > index 354a963075c5..22ecaf8b8f98 100644
> > --- a/drivers/net/veth.c
> > +++ b/drivers/net/veth.c
> > @@ -493,7 +493,7 @@ static int veth_xdp_xmit(struct net_device *dev, int n,
> > struct xdp_frame *frame = frames[i];
> > void *ptr = veth_xdp_to_ptr(frame);
> >
> > - if (unlikely(frame->len > max_len ||
> > + if (unlikely(xdp_get_frame_len(frame) > max_len ||
> > __ptr_ring_produce(&rq->xdp_ring, ptr)))
> > break;
>
> Looks correct, but could you explain what happens without this fix?
I guess this is just a theoretical issue, since at the moment we can't perform
a XDP_REDIRECT with a non-linear xdp buffer, but without this patch we will fail
to account peer max packet size since we take care of just the linear part of
the xdp_buff.
I am working on adding xdp multi-buff support to veth driver so I will repost this
patch into the series.
>
> Any other drivers might have the same issue?
I do not think so since other drivers are not able to map multi-frags yet (veth
already support it since we run __xdp_build_skb_from_frame()).
Regards,
Lorenzo
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-02-01 10:46 [PATCH bpf-next] net: veth: account total xdp_frame len running ndo_xdp_xmit Lorenzo Bianconi
2022-02-08 2:39 ` Alexei Starovoitov
2022-02-10 17:34 ` Lorenzo Bianconi
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