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slirp: VMStatify sbuf 

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 <dgilbert@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
This commit is contained in:
Dr. David Alan Gilbert 2017-02-20 18:50:17 +00:00 committed by Samuel Thibault
parent e3ec38ffd6
commit 2a7cab9e17
2 changed files with 78 additions and 42 deletions
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4
slirp/sbuf.h
View File

@ -12,8 +12,8 @@
#define sbspace(sb) ((sb)->sb_datalen - (sb)->sb_cc)
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

116
slirp/slirp.c
View File

@ -1189,19 +1189,72 @@ static const VMStateDescription vmstate_slirp_tcp = {
}
};
static void slirp_sbuf_save(QEMUFile *f, struct sbuf *sbuf)
{
uint32_t off;
/* 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;
};
qemu_put_be32(f, sbuf->sb_cc);
qemu_put_be32(f, sbuf->sb_datalen);
off = (uint32_t)(sbuf->sb_wptr - sbuf->sb_data);
qemu_put_sbe32(f, off);
off = (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);
static void sbuf_tmp_pre_save(void *opaque)
{
struct sbuf_tmp *tmp = opaque;
tmp->woff = tmp->parent->sb_wptr - tmp->parent->sb_data;
tmp->roff = tmp->parent->sb_rptr - tmp->parent->sb_data;
}
static int sbuf_tmp_post_load(void *opaque, int version)
{
struct sbuf_tmp *tmp = opaque;
uint32_t requested_len = 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 != requested_len) {
return -ENOMEM;
}
if (tmp->woff >= requested_len ||
tmp->roff >= requested_len) {
error_report("invalid sbuf offsets r/w=%u/%u len=%u",
tmp->roff, tmp->woff, requested_len);
return -EINVAL;
}
tmp->parent->sb_wptr = tmp->parent->sb_data + tmp->woff;
tmp->parent->sb_rptr = tmp->parent->sb_data + tmp->roff;
return 0;
}
static const VMStateDescription vmstate_slirp_sbuf_tmp = {
.name = "slirp-sbuf-tmp",
.post_load = sbuf_tmp_post_load,
.pre_save = sbuf_tmp_pre_save,
.version_id = 0,
.fields = (VMStateField[]) {
VMSTATE_UINT32(woff, struct sbuf_tmp),
VMSTATE_UINT32(roff, struct sbuf_tmp),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_slirp_sbuf = {
.name = "slirp-sbuf",
.version_id = 0,
.fields = (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);
@ -1229,8 +1282,9 @@ static void slirp_socket_save(QEMUFile *f, struct socket *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);
}
@ -1267,31 +1321,9 @@ static void slirp_state_save(QEMUFile *f, void *opaque)
slirp_bootp_save(f, slirp);
}
static int slirp_sbuf_load(QEMUFile *f, struct sbuf *sbuf)
{
uint32_t off, sb_cc, sb_datalen;
sb_cc = qemu_get_be32(f);
sb_datalen = qemu_get_be32(f);
sbreserve(sbuf, sb_datalen);
if (sbuf->sb_datalen != sb_datalen)
return -ENOMEM;
sbuf->sb_cc = sb_cc;
off = qemu_get_sbe32(f);
sbuf->sb_wptr = sbuf->sb_data + off;
off = qemu_get_sbe32(f);
sbuf->sb_rptr = 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_id)
{
int ret = 0;
if (tcp_attach(so) < 0)
return -ENOMEM;
@ -1328,11 +1360,15 @@ static int slirp_socket_load(QEMUFile *f, struct socket *so, int version_id)
so->so_emu = qemu_get_byte(f);
so->so_type = qemu_get_byte(f);
so->so_state = 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 = vmstate_load_state(f, &vmstate_slirp_sbuf, &so->so_rcv, 0);
if (!ret) {
ret = vmstate_load_state(f, &vmstate_slirp_sbuf, &so->so_snd, 0);
}
if (!ret) {
ret = vmstate_load_state(f, &vmstate_slirp_tcp, so->so_tcpcb, 0);
}
return ret;
}
static void slirp_bootp_load(QEMUFile *f, Slirp *slirp)