Hi Ferruh,

Thank you for your reply,

On the potential confusion for users of the DPDK memif PMD : when
defaulting to abstract sockets was added in [0] (v20.10 release)
it did change the existing behavior, so reverting it would restore the old
behavior.
Also abstract sockets are quite a unusual feature in linux (a 0byte
prefixed string...), so I'm expecting most users of memif to just use
regular sockets because they're way easier to handle.

Also my guess is it will probably bug people if the way to use regular
sockets is to pass `abstract-socket=false` to the PMD config.
What do you think ?

Cheers
-Nathan

[0] 2f865ed07b

Le mer. 7 déc. 2022 à 16:14, Ferruh Yigit <ferruh.yigit@amd.com> a écrit :

> On 10/17/2022 1:12 PM, Nathan Skrzypczak wrote:
> > This patch changes the default value of the memif abstract
> > socket flag to false. The implementation of memif with
> > abstract sockets made abstract-socket=yes the
> > default in [0] which might confuse users.
> >
>
> Hi Nathan,
>
> OK to update logs to clarify nature of the socket,
>
> but why do you think making abstract socket default socket type confuses
> the users?
>
> > This patches makes 'socket-abstract=no' the new default,
> > and adds warnings mentioning the nature of the socket
> > concerned in an attempt to avoid future foot-gunning.
> >
> > [0] commit 2f865ed07bb6 ("net/memif: use abstract socket address")
> >
> > Signed-off-by: Nathan Skrzypczak <nathan.skrzypczak@gmail.com>
> > ---
> >  doc/guides/nics/memif.rst         | 2 +-
> >  drivers/net/memif/memif_socket.c  | 7 +++++--
> >  drivers/net/memif/rte_eth_memif.c | 3 ---
> >  3 files changed, 6 insertions(+), 6 deletions(-)
> >
> > diff --git a/doc/guides/nics/memif.rst b/doc/guides/nics/memif.rst
> > index aca843640b..43d1cd1b38 100644
> > --- a/doc/guides/nics/memif.rst
> > +++ b/doc/guides/nics/memif.rst
> > @@ -43,7 +43,7 @@ client.
> >     "bsize=1024", "Size of single packet buffer", "2048", "uint16_t"
> >     "rsize=11", "Log2 of ring size. If rsize is 10, actual ring size is
> 1024", "10", "1-14"
> >     "socket=/tmp/memif.sock", "Socket filename", "/tmp/memif.sock",
> "string len 108"
> > -   "socket-abstract=no", "Set usage of abstract socket address", "yes",
> "yes|no"
> > +   "socket-abstract=no", "Is the socket an abstract socket", "no",
> "yes|no"
> >     "mac=01:23:45:ab:cd:ef", "Mac address", "01:ab:23:cd:45:ef", ""
> >     "secret=abc123", "Secret is an optional security option, which if
> specified, must be matched by peer", "", "string len 24"
> >     "zero-copy=yes", "Enable/disable zero-copy client mode. Only
> relevant to client, requires '--single-file-segments' eal argument", "no",
> "yes|no"
> > diff --git a/drivers/net/memif/memif_socket.c
> b/drivers/net/memif/memif_socket.c
> > index 4700ce2e77..5344e60147 100644
> > --- a/drivers/net/memif/memif_socket.c
> > +++ b/drivers/net/memif/memif_socket.c
> > @@ -939,7 +939,8 @@ memif_socket_create(char *key, uint8_t listener,
> bool is_abstract)
> >               if (ret < 0)
> >                       goto error;
> >
> > -             MIF_LOG(DEBUG, "Memif listener socket %s created.",
> sock->filename);
> > +             MIF_LOG(DEBUG, "Memif listener %s socket %s created.",
> > +                     is_abstract ? "abstract" : "", sock->filename);
> >
> >               /* Allocate interrupt instance */
> >               sock->intr_handle =
> > @@ -1139,7 +1140,9 @@ memif_connect_client(struct rte_eth_dev *dev)
> >
> >       ret = connect(sockfd, (struct sockaddr *)&sun, sunlen);
> >       if (ret < 0) {
> > -             MIF_LOG(ERR, "Failed to connect socket: %s.",
> pmd->socket_filename);
> > +             MIF_LOG(ERR, "Failed to connect %s socket: %s.",
> > +                 pmd->flags & ETH_MEMIF_FLAG_SOCKET_ABSTRACT ?
> "abstract" : "",
> > +                 pmd->socket_filename);
> >               goto error;
> >       }
> >
> > diff --git a/drivers/net/memif/rte_eth_memif.c
> b/drivers/net/memif/rte_eth_memif.c
> > index 5b5cae34ea..81e502ccaf 100644
> > --- a/drivers/net/memif/rte_eth_memif.c
> > +++ b/drivers/net/memif/rte_eth_memif.c
> > @@ -1823,9 +1823,6 @@ rte_pmd_memif_probe(struct rte_vdev_device *vdev)
> >               MIF_LOG(WARNING, "Failed to register mp action callback:
> %s",
> >                       strerror(rte_errno));
> >
> > -     /* use abstract address by default */
> > -     flags |= ETH_MEMIF_FLAG_SOCKET_ABSTRACT;
> > -
> >       kvlist = rte_kvargs_parse(rte_vdev_device_args(vdev),
> valid_arguments);
> >
> >       /* parse parameters */
>
>