From nobody Sun Feb 8 17:47:55 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1491240023182895.7610580170617; Mon, 3 Apr 2017 10:20:23 -0700 (PDT) Received: from localhost ([::1]:60394 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cv5eP-0001KT-Pe for importer@patchew.org; Mon, 03 Apr 2017 13:20:21 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54981) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cv5cx-0000QC-Sc for qemu-devel@nongnu.org; Mon, 03 Apr 2017 13:18:53 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cv5cw-0003jr-6v for qemu-devel@nongnu.org; Mon, 03 Apr 2017 13:18:51 -0400 Received: from mx1.redhat.com ([209.132.183.28]:51894) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cv5cv-0003jM-UY for qemu-devel@nongnu.org; Mon, 03 Apr 2017 13:18:50 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D37F61556C; Mon, 3 Apr 2017 17:18:48 +0000 (UTC) Received: from dgilbert-t530.redhat.com (ovpn-117-210.ams2.redhat.com [10.36.117.210]) by smtp.corp.redhat.com (Postfix) with ESMTP id A14ADA0A34; Mon, 3 Apr 2017 17:18:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com D37F61556C Authentication-Results: ext-mx05.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx05.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=dgilbert@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com D37F61556C From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, samuel.thibault@gnu.org, jan.kiszka@siemens.com Date: Mon, 3 Apr 2017 18:18:40 +0100 Message-Id: <20170403171843.3363-3-dgilbert@redhat.com> In-Reply-To: <20170403171843.3363-1-dgilbert@redhat.com> References: <20170403171843.3363-1-dgilbert@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Mon, 03 Apr 2017 17:18:49 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v5 2/5] slirp: VMStatify sbuf X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: quintela@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: "Dr. David Alan Gilbert" Convert the sbuf structure to a VMStateDescription. Note this uses the VMSTATE_WITH_TMP mechanism to calculate and reload the offsets based on the pointers. Signed-off-by: Dr. David Alan Gilbert Reviewed-by: David Gibson Reviewed-by: Juan Quintela Acked-by: Samuel Thibault --- slirp/sbuf.h | 4 +- slirp/slirp.c | 116 ++++++++++++++++++++++++++++++++++++++----------------= ---- 2 files changed, 78 insertions(+), 42 deletions(-) diff --git a/slirp/sbuf.h b/slirp/sbuf.h index efcec39..a722ecb 100644 --- a/slirp/sbuf.h +++ b/slirp/sbuf.h @@ -12,8 +12,8 @@ #define sbspace(sb) ((sb)->sb_datalen - (sb)->sb_cc) =20 struct sbuf { - u_int sb_cc; /* actual chars in buffer */ - u_int sb_datalen; /* Length of data */ + uint32_t sb_cc; /* actual chars in buffer */ + uint32_t sb_datalen; /* Length of data */ char *sb_wptr; /* write pointer. points to where the next * bytes should be written in the sbuf */ char *sb_rptr; /* read pointer. points to where the next diff --git a/slirp/slirp.c b/slirp/slirp.c index 86eefc3..2b834af 100644 --- a/slirp/slirp.c +++ b/slirp/slirp.c @@ -1185,19 +1185,72 @@ static const VMStateDescription vmstate_slirp_tcp = =3D { } }; =20 -static void slirp_sbuf_save(QEMUFile *f, struct sbuf *sbuf) +/* The sbuf has a pair of pointers that are migrated as offsets; + * we calculate the offsets and restore the pointers using + * pre_save/post_load on a tmp structure. + */ +struct sbuf_tmp { + struct sbuf *parent; + uint32_t roff, woff; +}; + +static void sbuf_tmp_pre_save(void *opaque) +{ + struct sbuf_tmp *tmp =3D opaque; + tmp->woff =3D tmp->parent->sb_wptr - tmp->parent->sb_data; + tmp->roff =3D tmp->parent->sb_rptr - tmp->parent->sb_data; +} + +static int sbuf_tmp_post_load(void *opaque, int version) { - uint32_t off; - - qemu_put_be32(f, sbuf->sb_cc); - qemu_put_be32(f, sbuf->sb_datalen); - off =3D (uint32_t)(sbuf->sb_wptr - sbuf->sb_data); - qemu_put_sbe32(f, off); - off =3D (uint32_t)(sbuf->sb_rptr - sbuf->sb_data); - qemu_put_sbe32(f, off); - qemu_put_buffer(f, (unsigned char*)sbuf->sb_data, sbuf->sb_datalen); + struct sbuf_tmp *tmp =3D opaque; + uint32_t requested_len =3D tmp->parent->sb_datalen; + + /* Allocate the buffer space used by the field after the tmp */ + sbreserve(tmp->parent, tmp->parent->sb_datalen); + + if (tmp->parent->sb_datalen !=3D requested_len) { + return -ENOMEM; + } + if (tmp->woff >=3D requested_len || + tmp->roff >=3D requested_len) { + error_report("invalid sbuf offsets r/w=3D%u/%u len=3D%u", + tmp->roff, tmp->woff, requested_len); + return -EINVAL; + } + + tmp->parent->sb_wptr =3D tmp->parent->sb_data + tmp->woff; + tmp->parent->sb_rptr =3D tmp->parent->sb_data + tmp->roff; + + return 0; } =20 + +static const VMStateDescription vmstate_slirp_sbuf_tmp =3D { + .name =3D "slirp-sbuf-tmp", + .post_load =3D sbuf_tmp_post_load, + .pre_save =3D sbuf_tmp_pre_save, + .version_id =3D 0, + .fields =3D (VMStateField[]) { + VMSTATE_UINT32(woff, struct sbuf_tmp), + VMSTATE_UINT32(roff, struct sbuf_tmp), + VMSTATE_END_OF_LIST() + } +}; + +static const VMStateDescription vmstate_slirp_sbuf =3D { + .name =3D "slirp-sbuf", + .version_id =3D 0, + .fields =3D (VMStateField[]) { + VMSTATE_UINT32(sb_cc, struct sbuf), + VMSTATE_UINT32(sb_datalen, struct sbuf), + VMSTATE_WITH_TMP(struct sbuf, struct sbuf_tmp, vmstate_slirp_sbuf_= tmp), + VMSTATE_VBUFFER_UINT32(sb_data, struct sbuf, 0, NULL, sb_datalen), + VMSTATE_END_OF_LIST() + } +}; + + static void slirp_socket_save(QEMUFile *f, struct socket *so) { qemu_put_be32(f, so->so_urgc); @@ -1225,8 +1278,9 @@ static void slirp_socket_save(QEMUFile *f, struct soc= ket *so) qemu_put_byte(f, so->so_emu); qemu_put_byte(f, so->so_type); qemu_put_be32(f, so->so_state); - slirp_sbuf_save(f, &so->so_rcv); - slirp_sbuf_save(f, &so->so_snd); + /* TODO: Build vmstate at this level */ + vmstate_save_state(f, &vmstate_slirp_sbuf, &so->so_rcv, 0); + vmstate_save_state(f, &vmstate_slirp_sbuf, &so->so_snd, 0); vmstate_save_state(f, &vmstate_slirp_tcp, so->so_tcpcb, 0); } =20 @@ -1263,31 +1317,9 @@ static void slirp_state_save(QEMUFile *f, void *opaq= ue) slirp_bootp_save(f, slirp); } =20 -static int slirp_sbuf_load(QEMUFile *f, struct sbuf *sbuf) -{ - uint32_t off, sb_cc, sb_datalen; - - sb_cc =3D qemu_get_be32(f); - sb_datalen =3D qemu_get_be32(f); - - sbreserve(sbuf, sb_datalen); - - if (sbuf->sb_datalen !=3D sb_datalen) - return -ENOMEM; - - sbuf->sb_cc =3D sb_cc; - - off =3D qemu_get_sbe32(f); - sbuf->sb_wptr =3D sbuf->sb_data + off; - off =3D qemu_get_sbe32(f); - sbuf->sb_rptr =3D sbuf->sb_data + off; - qemu_get_buffer(f, (unsigned char*)sbuf->sb_data, sbuf->sb_datalen); - - return 0; -} - static int slirp_socket_load(QEMUFile *f, struct socket *so, int version_i= d) { + int ret =3D 0; if (tcp_attach(so) < 0) return -ENOMEM; =20 @@ -1324,11 +1356,15 @@ static int slirp_socket_load(QEMUFile *f, struct so= cket *so, int version_id) so->so_emu =3D qemu_get_byte(f); so->so_type =3D qemu_get_byte(f); so->so_state =3D qemu_get_be32(f); - if (slirp_sbuf_load(f, &so->so_rcv) < 0) - return -ENOMEM; - if (slirp_sbuf_load(f, &so->so_snd) < 0) - return -ENOMEM; - return vmstate_load_state(f, &vmstate_slirp_tcp, so->so_tcpcb, 0); + /* TODO: VMState at this level */ + ret =3D vmstate_load_state(f, &vmstate_slirp_sbuf, &so->so_rcv, 0); + if (!ret) { + ret =3D vmstate_load_state(f, &vmstate_slirp_sbuf, &so->so_snd, 0); + } + if (!ret) { + ret =3D vmstate_load_state(f, &vmstate_slirp_tcp, so->so_tcpcb, 0); + } + return ret; } =20 static void slirp_bootp_load(QEMUFile *f, Slirp *slirp) --=20 2.9.3