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author | Dr. David Alan Gilbert <dgilbert@redhat.com> | 2017-02-20 18:50:17 +0000 |
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committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2017-04-29 18:44:16 +0200 |
commit | 5f6007a17c57519d6dcf7149193d164350878e3d (patch) | |
tree | 009b6bdea5aad3671685ec32ac23f4664caac953 | |
parent | 4a6e737a16e9ecefee0885975fc642c4dea56c7a (diff) | |
download | slirp-5f6007a17c57519d6dcf7149193d164350878e3d.zip slirp-5f6007a17c57519d6dcf7149193d164350878e3d.tar.gz slirp-5f6007a17c57519d6dcf7149193d164350878e3d.tar.bz2 |
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>
-rw-r--r-- | sbuf.h | 4 | ||||
-rw-r--r-- | slirp.c | 113 |
2 files changed, 75 insertions, 42 deletions
@@ -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 @@ -1181,19 +1181,69 @@ static const VMStateDescription vmstate_slirp_tcp = { VMSTATE_END_OF_LIST() } }; -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 = 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) { - uint32_t off; - - 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); + 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); @@ -1221,8 +1271,9 @@ 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); } @@ -1259,31 +1310,9 @@ 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; @@ -1320,11 +1349,15 @@ 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) |