linux.git/arch/parisc/include/uapi, branch master

net: add SO_DEVMEM_DONTNEED setsockopt to release RX frags

2024-09-12T03:44:32+00:00

Add an interface for the user to notify the kernel that it is done
reading the devmem dmabuf frags returned as cmsg. The kernel will
drop the reference on the frags to make them available for reuse.

Signed-off-by: Willem de Bruijn 
Signed-off-by: Kaiyuan Zhang 
Signed-off-by: Mina Almasry 
Reviewed-by: Pavel Begunkov 
Reviewed-by: Eric Dumazet 
Link: https://patch.msgid.link/20240910171458.219195-11-almasrymina@google.com
Signed-off-by: Jakub Kicinski

tcp: RX path for devmem TCP

2024-09-12T03:44:32+00:00

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 cmsg to the user indicating the number of bytes
returned in the linear buffer.

tcp_recvmsg_devmem() then loops over the unaccessible devmem skb frags,
and returns to the user a cmsg_devmem indicating the location of the
data in the dmabuf device memory. cmsg_devmem contains this information:

1. the offset into the dmabuf where the payload starts. 'frag_offset'.
2. the size of the frag. 'frag_size'.
3. an opaque token 'frag_token' to return to the kernel when the buffer
is to be released.

The pages awaiting freeing are stored in the newly added
sk->sk_user_frags, and each page passed to userspace is get_page()'d.
This reference is dropped once the userspace indicates that it is
done reading this page.  All pages are released when the socket is
destroyed.

Signed-off-by: Willem de Bruijn 
Signed-off-by: Kaiyuan Zhang 
Signed-off-by: Mina Almasry 
Reviewed-by: Pavel Begunkov 
Reviewed-by: Eric Dumazet 
Link: https://patch.msgid.link/20240910171458.219195-10-almasrymina@google.com
Signed-off-by: Jakub Kicinski

parisc: Define sigset_t in parisc uapi header

2024-04-29T11:02:31+00:00

The util-linux debian package fails to build on parisc, because
sigset_t isn't defined in asm/signal.h when included from userspace.
Move the sigset_t type from internal header to the uapi header to fix the
build.

Link: https://buildd.debian.org/status/fetch.php?pkg=util-linux&arch=hppa&ver=2.40-7&stamp=1714163443&raw=0
Signed-off-by: Helge Deller 
Cc: stable@vger.kernel.org # v6.0+

parisc: Drop the HP-UX ENOSYM and EREMOTERELEASE error codes

2023-11-25T08:43:18+00:00

Those return codes are only defined for the parisc architecture and
are leftovers from when we wanted to be HP-UX compatible.

They are not returned by any Linux kernel syscall but do trigger
problems with the glibc strerrorname_np() and strerror() functions as
reported in glibc issue #31080.

There is no need to keep them, so simply remove them.

Signed-off-by: Helge Deller 
Reported-by: Bruno Haible 
Closes: https://sourceware.org/bugzilla/show_bug.cgi?id=31080
Cc: stable@vger.kernel.org

parisc/pdc: Add width field to struct pdc_model

2023-10-30T13:54:41+00:00

PDC2.0 specifies the additional PSW-bit field.

Signed-off-by: Helge Deller 
Cc: stable@vger.kernel.org

parisc: Add some missing PDC functions and constants

2023-10-30T13:54:40+00:00

Signed-off-by: Helge Deller

parisc: Add cacheflush() syscall

2023-06-30T15:14:13+00:00

Signed-off-by: Helge Deller

net: core: add getsockopt SO_PEERPIDFD

2023-06-12T09:45:50+00:00

Add SO_PEERPIDFD which allows to get pidfd of peer socket holder pidfd.
This thing is direct analog of SO_PEERCRED which allows to get plain PID.

Cc: "David S. Miller" 
Cc: Eric Dumazet 
Cc: Jakub Kicinski 
Cc: Paolo Abeni 
Cc: Leon Romanovsky 
Cc: David Ahern 
Cc: Arnd Bergmann 
Cc: Kees Cook 
Cc: Christian Brauner 
Cc: Kuniyuki Iwashima 
Cc: Lennart Poettering 
Cc: Luca Boccassi 
Cc: Daniel Borkmann 
Cc: Stanislav Fomichev 
Cc: bpf@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Reviewed-by: Christian Brauner 
Acked-by: Stanislav Fomichev 
Tested-by: Luca Boccassi 
Signed-off-by: Alexander Mikhalitsyn 
Reviewed-by: Eric Dumazet 
Signed-off-by: David S. Miller

scm: add SO_PASSPIDFD and SCM_PIDFD

2023-06-12T09:45:49+00:00

Implement SCM_PIDFD, a new type of CMSG type analogical to SCM_CREDENTIALS,
but it contains pidfd instead of plain pid, which allows programmers not
to care about PID reuse problem.

We mask SO_PASSPIDFD feature if CONFIG_UNIX is not builtin because
it depends on a pidfd_prepare() API which is not exported to the kernel
modules.

Idea comes from UAPI kernel group:
https://uapi-group.org/kernel-features/

Big thanks to Christian Brauner and Lennart Poettering for productive
discussions about this.

Cc: "David S. Miller" 
Cc: Eric Dumazet 
Cc: Jakub Kicinski 
Cc: Paolo Abeni 
Cc: Leon Romanovsky 
Cc: David Ahern 
Cc: Arnd Bergmann 
Cc: Kees Cook 
Cc: Christian Brauner 
Cc: Kuniyuki Iwashima 
Cc: Lennart Poettering 
Cc: Luca Boccassi 
Cc: linux-kernel@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Tested-by: Luca Boccassi 
Reviewed-by: Kuniyuki Iwashima 
Reviewed-by: Christian Brauner 
Signed-off-by: Alexander Mikhalitsyn 
Reviewed-by: Eric Dumazet 
Signed-off-by: David S. Miller

parisc: Align parisc MADV_XXX constants with all other architectures

2022-12-17T22:19:39+00:00

Adjust some MADV_XXX constants to be in sync what their values are on
all other platforms. There is currently no reason to have an own
numbering on parisc, but it requires workarounds in many userspace
sources (e.g. glibc, qemu, ...) - which are often forgotten and thus
introduce bugs and different behaviour on parisc.

A wrapper avoids an ABI breakage for existing userspace applications by
translating any old values to the new ones, so this change allows us to
move over all programs to the new ABI over time.

Signed-off-by: Helge Deller