From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 67215375 for ; Thu, 18 Jan 2024 14:36:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705588574; cv=none; b=kKctGxYMAo7qQNaKeLnpQnkPD+RRzdshy+vJjyj0psGJkU4glTRTTMidZrqPuPeM+TsWay7CAk5qWJrjmv6uWyIR7ZF/AvoypUAlQ0BMZmps1su1+KloPqzd3y0gLaOJA753UgxwdlRDQDRsY20TEaIjC/YfwZ2JI6Ftw8zFT8Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705588574; c=relaxed/simple; bh=cfIC/09YpHRI08ILoRoIcxJ2hDWWrec3+FYlNERkg0s=; h=Received:DKIM-Signature:Message-ID:Subject:From:To:Cc:Date: In-Reply-To:References:Autocrypt:Content-Type: Content-Transfer-Encoding:User-Agent:MIME-Version; b=Bx5ukm1pW4+agRhUKQrHxbT9XyEVjDUPwVNx498UBzY5ak0k9wfhnDaw5VJiBe193QVEKja8NZ/GDaLTsVy/FOr1eSICKy9emlyq/ShOcgES6TCkgQ5U1jcl4mBrCqpqNejATkAYarv0jJFTXuaVb86dp0eY4pzk7TMCNMAg25g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=JuVF0BFA; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="JuVF0BFA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 65DB3C43390; Thu, 18 Jan 2024 14:36:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1705588573; bh=cfIC/09YpHRI08ILoRoIcxJ2hDWWrec3+FYlNERkg0s=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=JuVF0BFAJFEWdf+Nrg0nhSU0TNRROw5UnTyz7BcNRIT7egGuGRbgI8NOonoIol5qZ EvKX+3bPkBLSPjPpC4KumAGtpnOZRJQ7BVbnh+WeAon0p+r4GU0BnuidtTBRsKiShD hyMIr1M0lqUnddrVO4gDWa9ewmPIBvB4V3aM/25i0YwWtb5qvnZ9IkgMYGuyA3WtwL Jm/ZNeZlyv1Go1Nbs/zM/LELL6R8+6eBcr/LhNWkgsNkX4hSuR2/wW9c3XY34yNuHZ HVZ7332CPRmO9lNPIYqx1aR+aWO5bOojTGHFrs3W87oFeL/WV7dtpa6esrhkfGA0+X 2mfgHD/pxjs5g== Message-ID: <5e63fddf849ad639ffd6e8ad2caea3f5b6e4cb7a.camel@kernel.org> Subject: Re: [PATCH v4 3/3] libceph: just wait for more data to be available on the socket From: Jeff Layton To: xiubli@redhat.com, ceph-devel@vger.kernel.org Cc: idryomov@gmail.com, vshankar@redhat.com, mchangir@redhat.com Date: Thu, 18 Jan 2024 09:36:12 -0500 In-Reply-To: <20240118105047.792879-4-xiubli@redhat.com> References: <20240118105047.792879-1-xiubli@redhat.com> <20240118105047.792879-4-xiubli@redhat.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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 kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.3 (3.50.3-1.fc39) Precedence: bulk X-Mailing-List: ceph-devel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2024-01-18 at 18:50 +0800, xiubli@redhat.com wrote: > From: Xiubo Li >=20 > The messages from ceph maybe split into multiple socket packages > and we just need to wait for all the data to be availiable on the > sokcet. > > This will add 'sr_total_resid' to record the total length for all > data items for sparse-read message and 'sr_resid_elen' to record > the current extent total length. >=20 It's been a while since I was in the ceph messenger code, and my v1 memory is especially fuzzy. I really don't quite understand how tracking yet another length field solves the stated problem. I'd really appreciate a description of the problem that you saw and how this solves it. The ceph bug is not very straightforward. I get that we need to wait for a certain amount of data to be available on the socket before we drive the sparse_read op, but I don't quite see how that's being achieved here. Also, why is this not a problem on messenger v2? > URL: https://tracker.ceph.com/issues/63586 > Signed-off-by: Xiubo Li > --- > include/linux/ceph/messenger.h | 1 + > net/ceph/messenger_v1.c | 32 +++++++++++++++++++++----------- > 2 files changed, 22 insertions(+), 11 deletions(-) >=20 > diff --git a/include/linux/ceph/messenger.h b/include/linux/ceph/messenge= r.h > index 2eaaabbe98cb..ca6f82abed62 100644 > --- a/include/linux/ceph/messenger.h > +++ b/include/linux/ceph/messenger.h > @@ -231,6 +231,7 @@ struct ceph_msg_data { > =20 > struct ceph_msg_data_cursor { > size_t total_resid; /* across all data items */ > + size_t sr_total_resid; /* across all data items for sparse-read */ > =20 > struct ceph_msg_data *data; /* current data item */ > size_t resid; /* bytes not yet consumed */ > diff --git a/net/ceph/messenger_v1.c b/net/ceph/messenger_v1.c > index 4cb60bacf5f5..2733da891688 100644 > --- a/net/ceph/messenger_v1.c > +++ b/net/ceph/messenger_v1.c > @@ -160,7 +160,9 @@ static size_t sizeof_footer(struct ceph_connection *c= on) > static void prepare_message_data(struct ceph_msg *msg, u32 data_len) > { > /* Initialize data cursor if it's not a sparse read */ > - if (!msg->sparse_read) > + if (msg->sparse_read) > + msg->cursor.sr_total_resid =3D data_len; > + else > ceph_msg_data_cursor_init(&msg->cursor, msg, data_len); > } > =20 > @@ -1032,35 +1034,43 @@ static int read_partial_sparse_msg_data(struct ce= ph_connection *con) > bool do_datacrc =3D !ceph_test_opt(from_msgr(con->msgr), NOCRC); > u32 crc =3D 0; > int ret =3D 1; > + int len; > =20 > if (do_datacrc) > crc =3D con->in_data_crc; > =20 > - do { > - if (con->v1.in_sr_kvec.iov_base) > + while (cursor->sr_total_resid) { > + len =3D 0; > + if (con->v1.in_sr_kvec.iov_base) { > + len =3D con->v1.in_sr_kvec.iov_len; > ret =3D read_partial_message_chunk(con, > &con->v1.in_sr_kvec, > con->v1.in_sr_len, > &crc); > - else if (cursor->sr_resid > 0) > + len =3D con->v1.in_sr_kvec.iov_len - len; > + } else if (cursor->sr_resid > 0) { > + len =3D cursor->sr_resid; > ret =3D read_partial_sparse_msg_extent(con, &crc); > - > - if (ret <=3D 0) { > - if (do_datacrc) > - con->in_data_crc =3D crc; > - return ret; > + len -=3D cursor->sr_resid; > } > + cursor->sr_total_resid -=3D len; > + if (ret <=3D 0) > + break; > =20 > memset(&con->v1.in_sr_kvec, 0, sizeof(con->v1.in_sr_kvec)); > ret =3D con->ops->sparse_read(con, cursor, > (char **)&con->v1.in_sr_kvec.iov_base); > + if (ret <=3D 0) { > + ret =3D ret ? : 1; /* must return > 0 to indicate success */ The above is a gcc-ism that we probably shouldn't be using. Can this be: ret =3D ret ? ret : 1; ? > + break; > + } > con->v1.in_sr_len =3D ret; > - } while (ret > 0); > + } > =20 > if (do_datacrc) > con->in_data_crc =3D crc; > =20 > - return ret < 0 ? ret : 1; /* must return > 0 to indicate success */ > + return ret; > } > =20 > static int read_partial_msg_data(struct ceph_connection *con) --=20 Jeff Layton