On 11/6/23 22:55, Willem de Bruijn wrote:
On Mon, Nov 6, 2023 at 2:34 PM Stanislav Fomichev wrote:
On 11/06, Willem de Bruijn wrote:
IMHO, we need a better UAPI to receive the tokens and give them back to
the kernel. CMSG + setsockopt(SO_DEVMEM_DONTNEED) get the job done,
but look dated and
On 11/9/23 16:07, Edward Cree wrote:
On 09/11/2023 02:39, Mina Almasry wrote:
On Wed, Nov 8, 2023 at 7:36 AM Edward Cree wrote:
If not then surely the way to return a memory area
in an io_uring idiom is just to post a new read sqe ('RX descriptor')
pointing into it, rather than
On 11/6/23 22:34, Stanislav Fomichev wrote:
On 11/06, Willem de Bruijn wrote:
IMHO, we need a better UAPI to receive the tokens and give them back to
the kernel. CMSG + setsockopt(SO_DEVMEM_DONTNEED) get the job done,
but look dated and hacky :-(
We should either do some kind of user/kernel
On Sun, 5 Nov 2023 18:44:09 -0800 Mina Almasry wrote:
> + if (!skb_frags_not_readable(skb)) {
nit: maybe call the helper skb_frags_readable() and flip
the polarity, avoid double negatives.
On Thu, 09 Nov 2023 12:05:37 +0100 Paolo Abeni wrote:
> > I suppose we just disagree on the elegance of the API.
>
> FWIW, I think sockopt +cmsg is the right API.
FWIW it's fine by me as well.
On 09/11/2023 02:39, Mina Almasry wrote:
> On Wed, Nov 8, 2023 at 7:36 AM Edward Cree wrote:
>> If not then surely the way to return a memory area
>> in an io_uring idiom is just to post a new read sqe ('RX descriptor')
>> pointing into it, rather than explicitly returning it with setsockopt.
On Mon, 2023-11-06 at 14:55 -0800, Willem de Bruijn wrote:
> On Mon, Nov 6, 2023 at 2:34 PM Stanislav Fomichev wrote:
> >
> > On 11/06, Willem de Bruijn wrote:
> > > > > IMHO, we need a better UAPI to receive the tokens and give them back
> > > > > to
> > > > > the kernel. CMSG +
On Sun, 2023-11-05 at 18:44 -0800, Mina Almasry wrote:
[...]
> +/* On error, returns the -errno. On success, returns number of bytes sent to
> the
> + * user. May not consume all of @remaining_len.
> + */
> +static int tcp_recvmsg_devmem(const struct sock *sk, const struct sk_buff
> *skb,
> +
On Tue, Nov 7, 2023 at 4:01 PM David Ahern wrote:
>
> On 11/7/23 4:55 PM, Mina Almasry wrote:
> > On Mon, Nov 6, 2023 at 4:03 PM Willem de Bruijn
> > wrote:
> >>
> >> On Mon, Nov 6, 2023 at 3:55 PM David Ahern wrote:
> >>>
> >>> On 11/6/23 4:32 PM, Stanislav Fomichev wrote:
> > The concise
On 06/11/2023 21:17, Stanislav Fomichev wrote:
> I guess I'm just wondering whether other people have any suggestions
> here. Not sure Jonathan's way was better, but we fundamentally
> have two queues between the kernel and the userspace:
> - userspace receiving tokens (recvmsg + magical flag)
> -
On 11/7/23 4:55 PM, Mina Almasry wrote:
> On Mon, Nov 6, 2023 at 4:03 PM Willem de Bruijn
> wrote:
>>
>> On Mon, Nov 6, 2023 at 3:55 PM David Ahern wrote:
>>>
>>> On 11/6/23 4:32 PM, Stanislav Fomichev wrote:
> The concise notification API returns tokens as a range for
> compression,
On Mon, Nov 6, 2023 at 4:03 PM Willem de Bruijn
wrote:
>
> On Mon, Nov 6, 2023 at 3:55 PM David Ahern wrote:
> >
> > On 11/6/23 4:32 PM, Stanislav Fomichev wrote:
> > >> The concise notification API returns tokens as a range for
> > >> compression, encoding as two 32-bit unsigned integers start
On Mon, Nov 6, 2023 at 3:55 PM David Ahern wrote:
>
> On 11/6/23 4:32 PM, Stanislav Fomichev wrote:
> >> The concise notification API returns tokens as a range for
> >> compression, encoding as two 32-bit unsigned integers start + length.
> >> It allows for even further batching by returning
On 11/6/23 4:32 PM, Stanislav Fomichev wrote:
>> The concise notification API returns tokens as a range for
>> compression, encoding as two 32-bit unsigned integers start + length.
>> It allows for even further batching by returning multiple such ranges
>> in a single call.
>
> Tangential: should
On Mon, Nov 6, 2023 at 2:56 PM Willem de Bruijn
wrote:
>
> On Mon, Nov 6, 2023 at 2:34 PM Stanislav Fomichev wrote:
> >
> > On 11/06, Willem de Bruijn wrote:
> > > > > IMHO, we need a better UAPI to receive the tokens and give them back
> > > > > to
> > > > > the kernel. CMSG +
On Mon, Nov 6, 2023 at 2:34 PM Stanislav Fomichev wrote:
>
> On 11/06, Willem de Bruijn wrote:
> > > > IMHO, we need a better UAPI to receive the tokens and give them back to
> > > > the kernel. CMSG + setsockopt(SO_DEVMEM_DONTNEED) get the job done,
> > > > but look dated and hacky :-(
> > > >
>
On 11/06, Willem de Bruijn wrote:
> > > IMHO, we need a better UAPI to receive the tokens and give them back to
> > > the kernel. CMSG + setsockopt(SO_DEVMEM_DONTNEED) get the job done,
> > > but look dated and hacky :-(
> > >
> > > We should either do some kind of user/kernel shared memory queue
On 11/06, Mina Almasry wrote:
> On Mon, Nov 6, 2023 at 10:44 AM Stanislav Fomichev wrote:
> >
> > On 11/05, Mina Almasry wrote:
> > > In tcp_recvmsg_locked(), detect if the skb being received by the user
> > > is a devmem skb. In this case - if the user provided the MSG_SOCK_DEVMEM
> > > flag -
> > IMHO, we need a better UAPI to receive the tokens and give them back to
> > the kernel. CMSG + setsockopt(SO_DEVMEM_DONTNEED) get the job done,
> > but look dated and hacky :-(
> >
> > We should either do some kind of user/kernel shared memory queue to
> > receive/return the tokens (similar to
On Mon, Nov 6, 2023 at 10:44 AM Stanislav Fomichev wrote:
>
> On 11/05, Mina Almasry wrote:
> > In tcp_recvmsg_locked(), detect if the skb being received by the user
> > is a devmem skb. In this case - if the user provided the MSG_SOCK_DEVMEM
> > flag - pass it to tcp_recvmsg_devmem() for custom
On 11/05, Mina Almasry wrote:
> In tcp_recvmsg_locked(), detect if the skb being received by the user
> is a devmem skb. In this case - if the user provided the MSG_SOCK_DEVMEM
> flag - pass it to tcp_recvmsg_devmem() for custom handling.
>
> tcp_recvmsg_devmem() copies any data in the skb header
In tcp_recvmsg_locked(), detect if the skb being received by the user
is a devmem skb. In this case - if the user provided the MSG_SOCK_DEVMEM
flag - pass it to tcp_recvmsg_devmem() for custom handling.
tcp_recvmsg_devmem() copies any data in the skb header to the linear
buffer, and returns a
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