* [PATCH net-next] net/packet: Add getsockopt support for PACKET_COPY_THRESH
@ 2024-03-08 11:23 Juntong Deng
2024-03-08 11:43 ` Willem de Bruijn
0 siblings, 1 reply; 5+ messages in thread
From: Juntong Deng @ 2024-03-08 11:23 UTC (permalink / raw)
To: willemdebruijn.kernel, davem, edumazet, kuba, pabeni; +Cc: netdev, linux-kernel
Currently getsockopt does not support PACKET_COPY_THRESH,
and we are unable to get the value of PACKET_COPY_THRESH
socket option through getsockopt.
This patch adds getsockopt support for PACKET_COPY_THRESH.
Signed-off-by: Juntong Deng <juntong.deng@outlook.com>
---
net/packet/af_packet.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 0db31ca4982d..65042edd1a97 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -4090,6 +4090,9 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
case PACKET_VNET_HDR_SZ:
val = READ_ONCE(po->vnet_hdr_sz);
break;
+ case PACKET_COPY_THRESH:
+ val = pkt_sk(sk)->copy_thresh;
+ break;
case PACKET_VERSION:
val = po->tp_version;
break;
--
2.39.2
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH net-next] net/packet: Add getsockopt support for PACKET_COPY_THRESH
2024-03-08 11:23 [PATCH net-next] net/packet: Add getsockopt support for PACKET_COPY_THRESH Juntong Deng
@ 2024-03-08 11:43 ` Willem de Bruijn
2024-03-08 12:08 ` Juntong Deng
2024-03-08 13:06 ` Jason Xing
0 siblings, 2 replies; 5+ messages in thread
From: Willem de Bruijn @ 2024-03-08 11:43 UTC (permalink / raw)
To: Juntong Deng, willemdebruijn.kernel, davem, edumazet, kuba, pabeni
Cc: netdev, linux-kernel
Juntong Deng wrote:
> Currently getsockopt does not support PACKET_COPY_THRESH,
> and we are unable to get the value of PACKET_COPY_THRESH
> socket option through getsockopt.
>
> This patch adds getsockopt support for PACKET_COPY_THRESH.
>
> Signed-off-by: Juntong Deng <juntong.deng@outlook.com>
> ---
> net/packet/af_packet.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
> index 0db31ca4982d..65042edd1a97 100644
> --- a/net/packet/af_packet.c
> +++ b/net/packet/af_packet.c
> @@ -4090,6 +4090,9 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
> case PACKET_VNET_HDR_SZ:
> val = READ_ONCE(po->vnet_hdr_sz);
> break;
> + case PACKET_COPY_THRESH:
> + val = pkt_sk(sk)->copy_thresh;
> + break;
This is probably a good opportunity to use READ_ONCE/WRITE_ONCE for
this variable that can be modified and read concurrently.
Alternatively I can fix up all three locations in a follow-on patch.
No concerns with adding the getsockopt itself.
> case PACKET_VERSION:
> val = po->tp_version;
> break;
> --
> 2.39.2
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH net-next] net/packet: Add getsockopt support for PACKET_COPY_THRESH
2024-03-08 11:43 ` Willem de Bruijn
@ 2024-03-08 12:08 ` Juntong Deng
2024-03-08 12:24 ` Willem de Bruijn
2024-03-08 13:06 ` Jason Xing
1 sibling, 1 reply; 5+ messages in thread
From: Juntong Deng @ 2024-03-08 12:08 UTC (permalink / raw)
To: Willem de Bruijn, davem, edumazet, kuba, pabeni; +Cc: netdev, linux-kernel
On 2024/3/8 19:43, Willem de Bruijn wrote:
> Juntong Deng wrote:
>> Currently getsockopt does not support PACKET_COPY_THRESH,
>> and we are unable to get the value of PACKET_COPY_THRESH
>> socket option through getsockopt.
>>
>> This patch adds getsockopt support for PACKET_COPY_THRESH.
>>
>> Signed-off-by: Juntong Deng <juntong.deng@outlook.com>
>> ---
>> net/packet/af_packet.c | 3 +++
>> 1 file changed, 3 insertions(+)
>>
>> diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
>> index 0db31ca4982d..65042edd1a97 100644
>> --- a/net/packet/af_packet.c
>> +++ b/net/packet/af_packet.c
>> @@ -4090,6 +4090,9 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
>> case PACKET_VNET_HDR_SZ:
>> val = READ_ONCE(po->vnet_hdr_sz);
>> break;
>> + case PACKET_COPY_THRESH:
>> + val = pkt_sk(sk)->copy_thresh;
>> + break;
>
> This is probably a good opportunity to use READ_ONCE/WRITE_ONCE for
> this variable that can be modified and read concurrently.
>
> Alternatively I can fix up all three locations in a follow-on patch.
>
> No concerns with adding the getsockopt itself.
>
>> case PACKET_VERSION:
>> val = po->tp_version;
>> break;
>> --
>> 2.39.2
>>
>
>
Thanks for reviewing.
So, do I need to send PATCH V2 to add READ_ONCE?
Or do you want you to use a follow-on patch to fix all three locations
at once?
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH net-next] net/packet: Add getsockopt support for PACKET_COPY_THRESH
2024-03-08 12:08 ` Juntong Deng
@ 2024-03-08 12:24 ` Willem de Bruijn
0 siblings, 0 replies; 5+ messages in thread
From: Willem de Bruijn @ 2024-03-08 12:24 UTC (permalink / raw)
To: Juntong Deng, Willem de Bruijn, davem, edumazet, kuba, pabeni
Cc: netdev, linux-kernel
Juntong Deng wrote:
> On 2024/3/8 19:43, Willem de Bruijn wrote:
> > Juntong Deng wrote:
> >> Currently getsockopt does not support PACKET_COPY_THRESH,
> >> and we are unable to get the value of PACKET_COPY_THRESH
> >> socket option through getsockopt.
> >>
> >> This patch adds getsockopt support for PACKET_COPY_THRESH.
> >>
> >> Signed-off-by: Juntong Deng <juntong.deng@outlook.com>
> >> ---
> >> net/packet/af_packet.c | 3 +++
> >> 1 file changed, 3 insertions(+)
> >>
> >> diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
> >> index 0db31ca4982d..65042edd1a97 100644
> >> --- a/net/packet/af_packet.c
> >> +++ b/net/packet/af_packet.c
> >> @@ -4090,6 +4090,9 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
> >> case PACKET_VNET_HDR_SZ:
> >> val = READ_ONCE(po->vnet_hdr_sz);
> >> break;
> >> + case PACKET_COPY_THRESH:
> >> + val = pkt_sk(sk)->copy_thresh;
> >> + break;
> >
> > This is probably a good opportunity to use READ_ONCE/WRITE_ONCE for
> > this variable that can be modified and read concurrently.
> >
> > Alternatively I can fix up all three locations in a follow-on patch.
> >
> > No concerns with adding the getsockopt itself.
> >
> >> case PACKET_VERSION:
> >> val = po->tp_version;
> >> break;
> >> --
> >> 2.39.2
> >>
> >
> >
>
> Thanks for reviewing.
>
> So, do I need to send PATCH V2 to add READ_ONCE?
>
> Or do you want you to use a follow-on patch to fix all three locations
> at once?
Please use READ_ONCE and convert the existing accesses to copy_thresh
in the same patch to READ_ONCE/WRITE_ONCE. That's simplest.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH net-next] net/packet: Add getsockopt support for PACKET_COPY_THRESH
2024-03-08 11:43 ` Willem de Bruijn
2024-03-08 12:08 ` Juntong Deng
@ 2024-03-08 13:06 ` Jason Xing
1 sibling, 0 replies; 5+ messages in thread
From: Jason Xing @ 2024-03-08 13:06 UTC (permalink / raw)
To: Willem de Bruijn
Cc: Juntong Deng, davem, edumazet, kuba, pabeni, netdev, linux-kernel
On Fri, Mar 8, 2024 at 7:43 PM Willem de Bruijn
<willemdebruijn.kernel@gmail.com> wrote:
>
> Juntong Deng wrote:
> > Currently getsockopt does not support PACKET_COPY_THRESH,
> > and we are unable to get the value of PACKET_COPY_THRESH
> > socket option through getsockopt.
> >
> > This patch adds getsockopt support for PACKET_COPY_THRESH.
> >
> > Signed-off-by: Juntong Deng <juntong.deng@outlook.com>
> > ---
> > net/packet/af_packet.c | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
> > index 0db31ca4982d..65042edd1a97 100644
> > --- a/net/packet/af_packet.c
> > +++ b/net/packet/af_packet.c
> > @@ -4090,6 +4090,9 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
> > case PACKET_VNET_HDR_SZ:
> > val = READ_ONCE(po->vnet_hdr_sz);
> > break;
> > + case PACKET_COPY_THRESH:
> > + val = pkt_sk(sk)->copy_thresh;
> > + break;
>
> This is probably a good opportunity to use READ_ONCE/WRITE_ONCE for
> this variable that can be modified and read concurrently.
>
> Alternatively I can fix up all three locations in a follow-on patch.
Yes, variables which can be set through setsockopt related functions
have a chance to be modified when another process does read it.
The patch you mentioned goes like this, I think:
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 0db31ca4982d..b598dcafe441 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -2318,7 +2318,7 @@ static int tpacket_rcv(struct sk_buff *skb,
struct net_device *dev,
}
if (po->tp_version <= TPACKET_V2) {
if (macoff + snaplen > po->rx_ring.frame_size) {
- if (po->copy_thresh &&
+ if (READ_ONCE(po->copy_thresh) &&
atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
if (skb_shared(skb)) {
copy_skb = skb_clone(skb, GFP_ATOMIC);
@@ -3836,7 +3836,7 @@ packet_setsockopt(struct socket *sock, int
level, int optname, sockptr_t optval,
if (copy_from_sockptr(&val, optval, sizeof(val)))
return -EFAULT;
- pkt_sk(sk)->copy_thresh = val;
+ WRITE_ONCE(pkt_sk(sk)->copy_thresh, val);
return 0;
}
case PACKET_VERSION:
diff --git a/net/packet/diag.c b/net/packet/diag.c
index b3bd2f6c2bf7..47f69f3dbf73 100644
--- a/net/packet/diag.c
+++ b/net/packet/diag.c
@@ -17,7 +17,7 @@ static int pdiag_put_info(const struct packet_sock
*po, struct sk_buff *nlskb)
pinfo.pdi_index = po->ifindex;
pinfo.pdi_version = po->tp_version;
pinfo.pdi_reserve = po->tp_reserve;
- pinfo.pdi_copy_thresh = po->copy_thresh;
+ pinfo.pdi_copy_thresh = READ_ONCE(po->copy_thresh);
pinfo.pdi_tstamp = READ_ONCE(po->tp_tstamp);
pinfo.pdi_flags = 0;
Thanks,
Jason
>
> No concerns with adding the getsockopt itself.
>
> > case PACKET_VERSION:
> > val = po->tp_version;
> > break;
> > --
> > 2.39.2
> >
>
>
>
^ permalink raw reply related [flat|nested] 5+ messages in thread
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2024-03-08 11:23 [PATCH net-next] net/packet: Add getsockopt support for PACKET_COPY_THRESH Juntong Deng
2024-03-08 11:43 ` Willem de Bruijn
2024-03-08 12:08 ` Juntong Deng
2024-03-08 12:24 ` Willem de Bruijn
2024-03-08 13:06 ` Jason Xing
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