virtio-9p: pdu processing support.
Add helpers to process the PDUs. [kiran@linux.vnet.ibm.com: malloc to qemu_malloc coversion] Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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Anthony Liguori
parent
9f10751365
commit
405a549a16
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@ -0,0 +1,7 @@
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#ifndef _QEMU_VIRTIO_9P_DEBUG_H
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#define _QEMU_VIRTIO_9P_DEBUG_H
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extern int dotu;
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void pprint_pdu(V9fsPDU *pdu);
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#endif
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243
hw/virtio-9p.c
243
hw/virtio-9p.c
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@ -71,6 +71,248 @@ size_t pdu_packunpack(void *addr, struct iovec *sg, int sg_count,
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return copied;
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}
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static size_t pdu_unpack(void *dst, V9fsPDU *pdu, size_t offset, size_t size)
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{
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return pdu_packunpack(dst, pdu->elem.out_sg, pdu->elem.out_num,
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offset, size, 0);
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}
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static size_t pdu_pack(V9fsPDU *pdu, size_t offset, const void *src,
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size_t size)
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{
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return pdu_packunpack((void *)src, pdu->elem.in_sg, pdu->elem.in_num,
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offset, size, 1);
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}
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static int pdu_copy_sg(V9fsPDU *pdu, size_t offset, int rx, struct iovec *sg)
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{
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size_t pos = 0;
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int i, j;
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struct iovec *src_sg;
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unsigned int num;
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if (rx) {
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src_sg = pdu->elem.in_sg;
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num = pdu->elem.in_num;
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} else {
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src_sg = pdu->elem.out_sg;
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num = pdu->elem.out_num;
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}
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j = 0;
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for (i = 0; i < num; i++) {
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if (offset <= pos) {
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sg[j].iov_base = src_sg[i].iov_base;
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sg[j].iov_len = src_sg[i].iov_len;
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j++;
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} else if (offset < (src_sg[i].iov_len + pos)) {
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sg[j].iov_base = src_sg[i].iov_base;
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sg[j].iov_len = src_sg[i].iov_len;
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sg[j].iov_base += (offset - pos);
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sg[j].iov_len -= (offset - pos);
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j++;
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}
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pos += src_sg[i].iov_len;
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}
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return j;
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}
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static size_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
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{
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size_t old_offset = offset;
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va_list ap;
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int i;
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va_start(ap, fmt);
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for (i = 0; fmt[i]; i++) {
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switch (fmt[i]) {
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case 'b': {
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uint8_t *valp = va_arg(ap, uint8_t *);
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offset += pdu_unpack(valp, pdu, offset, sizeof(*valp));
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break;
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}
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case 'w': {
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uint16_t val, *valp;
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valp = va_arg(ap, uint16_t *);
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val = le16_to_cpupu(valp);
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offset += pdu_unpack(&val, pdu, offset, sizeof(val));
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*valp = val;
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break;
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}
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case 'd': {
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uint32_t val, *valp;
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valp = va_arg(ap, uint32_t *);
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val = le32_to_cpupu(valp);
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offset += pdu_unpack(&val, pdu, offset, sizeof(val));
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*valp = val;
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break;
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}
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case 'q': {
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uint64_t val, *valp;
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valp = va_arg(ap, uint64_t *);
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val = le64_to_cpup(valp);
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offset += pdu_unpack(&val, pdu, offset, sizeof(val));
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*valp = val;
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break;
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}
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case 'v': {
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struct iovec *iov = va_arg(ap, struct iovec *);
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int *iovcnt = va_arg(ap, int *);
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*iovcnt = pdu_copy_sg(pdu, offset, 0, iov);
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break;
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}
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case 's': {
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V9fsString *str = va_arg(ap, V9fsString *);
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offset += pdu_unmarshal(pdu, offset, "w", &str->size);
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/* FIXME: sanity check str->size */
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str->data = qemu_malloc(str->size + 1);
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offset += pdu_unpack(str->data, pdu, offset, str->size);
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str->data[str->size] = 0;
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break;
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}
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case 'Q': {
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V9fsQID *qidp = va_arg(ap, V9fsQID *);
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offset += pdu_unmarshal(pdu, offset, "bdq",
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&qidp->type, &qidp->version, &qidp->path);
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break;
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}
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case 'S': {
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V9fsStat *statp = va_arg(ap, V9fsStat *);
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offset += pdu_unmarshal(pdu, offset, "wwdQdddqsssssddd",
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&statp->size, &statp->type, &statp->dev,
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&statp->qid, &statp->mode, &statp->atime,
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&statp->mtime, &statp->length,
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&statp->name, &statp->uid, &statp->gid,
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&statp->muid, &statp->extension,
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&statp->n_uid, &statp->n_gid,
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&statp->n_muid);
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break;
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}
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default:
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break;
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}
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}
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va_end(ap);
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return offset - old_offset;
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}
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static size_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
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{
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size_t old_offset = offset;
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va_list ap;
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int i;
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va_start(ap, fmt);
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for (i = 0; fmt[i]; i++) {
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switch (fmt[i]) {
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case 'b': {
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uint8_t val = va_arg(ap, int);
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offset += pdu_pack(pdu, offset, &val, sizeof(val));
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break;
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}
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case 'w': {
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uint16_t val;
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cpu_to_le16w(&val, va_arg(ap, int));
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offset += pdu_pack(pdu, offset, &val, sizeof(val));
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break;
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}
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case 'd': {
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uint32_t val;
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cpu_to_le32w(&val, va_arg(ap, uint32_t));
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offset += pdu_pack(pdu, offset, &val, sizeof(val));
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break;
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}
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case 'q': {
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uint64_t val;
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cpu_to_le64w(&val, va_arg(ap, uint64_t));
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offset += pdu_pack(pdu, offset, &val, sizeof(val));
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break;
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}
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case 'v': {
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struct iovec *iov = va_arg(ap, struct iovec *);
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int *iovcnt = va_arg(ap, int *);
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*iovcnt = pdu_copy_sg(pdu, offset, 1, iov);
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break;
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}
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case 's': {
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V9fsString *str = va_arg(ap, V9fsString *);
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offset += pdu_marshal(pdu, offset, "w", str->size);
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offset += pdu_pack(pdu, offset, str->data, str->size);
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break;
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}
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case 'Q': {
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V9fsQID *qidp = va_arg(ap, V9fsQID *);
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offset += pdu_marshal(pdu, offset, "bdq",
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qidp->type, qidp->version, qidp->path);
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break;
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}
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case 'S': {
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V9fsStat *statp = va_arg(ap, V9fsStat *);
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offset += pdu_marshal(pdu, offset, "wwdQdddqsssssddd",
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statp->size, statp->type, statp->dev,
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&statp->qid, statp->mode, statp->atime,
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statp->mtime, statp->length, &statp->name,
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&statp->uid, &statp->gid, &statp->muid,
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&statp->extension, statp->n_uid,
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statp->n_gid, statp->n_muid);
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break;
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}
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default:
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break;
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}
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}
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va_end(ap);
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return offset - old_offset;
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}
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static void complete_pdu(V9fsState *s, V9fsPDU *pdu, ssize_t len)
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{
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int8_t id = pdu->id + 1; /* Response */
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if (len < 0) {
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V9fsString str;
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int err = -len;
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str.data = strerror(err);
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str.size = strlen(str.data);
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len = 7;
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len += pdu_marshal(pdu, len, "s", &str);
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if (dotu) {
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len += pdu_marshal(pdu, len, "d", err);
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}
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id = P9_RERROR;
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}
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/* fill out the header */
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pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag);
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/* keep these in sync */
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pdu->size = len;
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pdu->id = id;
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/* push onto queue and notify */
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virtqueue_push(s->vq, &pdu->elem, len);
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/* FIXME: we should batch these completions */
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virtio_notify(&s->vdev, s->vq);
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free_pdu(s, pdu);
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}
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static void v9fs_dummy(V9fsState *s, V9fsPDU *pdu)
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{
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/* Note: The following have been added to prevent GCC from complaining
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* They will be removed in the subsequent patches */
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(void)pdu_unmarshal;
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(void) complete_pdu;
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}
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static void v9fs_version(V9fsState *s, V9fsPDU *pdu)
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{
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if (debug_9p_pdu) {
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@ -135,6 +377,7 @@ static void v9fs_create(V9fsState *s, V9fsPDU *pdu)
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static void v9fs_flush(V9fsState *s, V9fsPDU *pdu)
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{
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v9fs_dummy(s, pdu);
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if (debug_9p_pdu) {
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pprint_pdu(pdu);
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}
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