vhost-user: factor out msg head and payload
split header and payload into separate structures, to enable easier handling of alignment issues. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin
parent
ab20bbd297
commit
24e34754eb
@ -112,7 +112,7 @@ static VhostUserConfig c __attribute__ ((unused));
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+ sizeof(c.size) \
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+ sizeof(c.flags))
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typedef struct VhostUserMsg {
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typedef struct {
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VhostUserRequest request;
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#define VHOST_USER_VERSION_MASK (0x3)
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@ -120,7 +120,9 @@ typedef struct VhostUserMsg {
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#define VHOST_USER_NEED_REPLY_MASK (0x1 << 3)
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uint32_t flags;
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uint32_t size; /* the following payload size */
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union {
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} QEMU_PACKED VhostUserHeader;
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typedef union {
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#define VHOST_USER_VRING_IDX_MASK (0xff)
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#define VHOST_USER_VRING_NOFD_MASK (0x1<<8)
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uint64_t u64;
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@ -130,15 +132,17 @@ typedef struct VhostUserMsg {
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VhostUserLog log;
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struct vhost_iotlb_msg iotlb;
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VhostUserConfig config;
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} payload;
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} VhostUserPayload;
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typedef struct VhostUserMsg {
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VhostUserHeader hdr;
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VhostUserPayload payload;
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} QEMU_PACKED VhostUserMsg;
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static VhostUserMsg m __attribute__ ((unused));
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#define VHOST_USER_HDR_SIZE (sizeof(m.request) \
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+ sizeof(m.flags) \
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+ sizeof(m.size))
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#define VHOST_USER_HDR_SIZE (sizeof(VhostUserHeader))
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#define VHOST_USER_PAYLOAD_SIZE (sizeof(m) - VHOST_USER_HDR_SIZE)
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#define VHOST_USER_PAYLOAD_SIZE (sizeof(VhostUserPayload))
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/* The version of the protocol we support */
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#define VHOST_USER_VERSION (0x1)
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@ -163,33 +167,33 @@ static int vhost_user_read(struct vhost_dev *dev, VhostUserMsg *msg)
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r = qemu_chr_fe_read_all(chr, p, size);
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if (r != size) {
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error_report("Failed to read msg header. Read %d instead of %d."
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" Original request %d.", r, size, msg->request);
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" Original request %d.", r, size, msg->hdr.request);
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goto fail;
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}
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/* validate received flags */
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if (msg->flags != (VHOST_USER_REPLY_MASK | VHOST_USER_VERSION)) {
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if (msg->hdr.flags != (VHOST_USER_REPLY_MASK | VHOST_USER_VERSION)) {
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error_report("Failed to read msg header."
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" Flags 0x%x instead of 0x%x.", msg->flags,
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" Flags 0x%x instead of 0x%x.", msg->hdr.flags,
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VHOST_USER_REPLY_MASK | VHOST_USER_VERSION);
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goto fail;
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}
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/* validate message size is sane */
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if (msg->size > VHOST_USER_PAYLOAD_SIZE) {
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if (msg->hdr.size > VHOST_USER_PAYLOAD_SIZE) {
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error_report("Failed to read msg header."
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" Size %d exceeds the maximum %zu.", msg->size,
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" Size %d exceeds the maximum %zu.", msg->hdr.size,
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VHOST_USER_PAYLOAD_SIZE);
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goto fail;
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}
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if (msg->size) {
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if (msg->hdr.size) {
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p += VHOST_USER_HDR_SIZE;
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size = msg->size;
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size = msg->hdr.size;
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r = qemu_chr_fe_read_all(chr, p, size);
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if (r != size) {
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error_report("Failed to read msg payload."
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" Read %d instead of %d.", r, msg->size);
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" Read %d instead of %d.", r, msg->hdr.size);
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goto fail;
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}
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}
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@ -205,7 +209,7 @@ static int process_message_reply(struct vhost_dev *dev,
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{
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VhostUserMsg msg_reply;
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if ((msg->flags & VHOST_USER_NEED_REPLY_MASK) == 0) {
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if ((msg->hdr.flags & VHOST_USER_NEED_REPLY_MASK) == 0) {
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return 0;
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}
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@ -213,10 +217,10 @@ static int process_message_reply(struct vhost_dev *dev,
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return -1;
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}
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if (msg_reply.request != msg->request) {
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if (msg_reply.hdr.request != msg->hdr.request) {
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error_report("Received unexpected msg type."
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"Expected %d received %d",
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msg->request, msg_reply.request);
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msg->hdr.request, msg_reply.hdr.request);
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return -1;
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}
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@ -243,15 +247,15 @@ static int vhost_user_write(struct vhost_dev *dev, VhostUserMsg *msg,
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{
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struct vhost_user *u = dev->opaque;
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CharBackend *chr = u->chr;
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int ret, size = VHOST_USER_HDR_SIZE + msg->size;
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int ret, size = VHOST_USER_HDR_SIZE + msg->hdr.size;
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/*
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* For non-vring specific requests, like VHOST_USER_SET_MEM_TABLE,
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* we just need send it once in the first time. For later such
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* request, we just ignore it.
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*/
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if (vhost_user_one_time_request(msg->request) && dev->vq_index != 0) {
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msg->flags &= ~VHOST_USER_NEED_REPLY_MASK;
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if (vhost_user_one_time_request(msg->hdr.request) && dev->vq_index != 0) {
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msg->hdr.flags &= ~VHOST_USER_NEED_REPLY_MASK;
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return 0;
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}
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@ -278,11 +282,11 @@ static int vhost_user_set_log_base(struct vhost_dev *dev, uint64_t base,
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bool shmfd = virtio_has_feature(dev->protocol_features,
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VHOST_USER_PROTOCOL_F_LOG_SHMFD);
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VhostUserMsg msg = {
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.request = VHOST_USER_SET_LOG_BASE,
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.flags = VHOST_USER_VERSION,
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.hdr.request = VHOST_USER_SET_LOG_BASE,
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.hdr.flags = VHOST_USER_VERSION,
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.payload.log.mmap_size = log->size * sizeof(*(log->log)),
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.payload.log.mmap_offset = 0,
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.size = sizeof(msg.payload.log),
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.hdr.size = sizeof(msg.payload.log),
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};
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if (shmfd && log->fd != -1) {
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@ -294,15 +298,15 @@ static int vhost_user_set_log_base(struct vhost_dev *dev, uint64_t base,
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}
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if (shmfd) {
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msg.size = 0;
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msg.hdr.size = 0;
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if (vhost_user_read(dev, &msg) < 0) {
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return -1;
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}
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if (msg.request != VHOST_USER_SET_LOG_BASE) {
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if (msg.hdr.request != VHOST_USER_SET_LOG_BASE) {
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error_report("Received unexpected msg type. "
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"Expected %d received %d",
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VHOST_USER_SET_LOG_BASE, msg.request);
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VHOST_USER_SET_LOG_BASE, msg.hdr.request);
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return -1;
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}
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}
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@ -320,12 +324,12 @@ static int vhost_user_set_mem_table(struct vhost_dev *dev,
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VHOST_USER_PROTOCOL_F_REPLY_ACK);
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VhostUserMsg msg = {
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.request = VHOST_USER_SET_MEM_TABLE,
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.flags = VHOST_USER_VERSION,
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.hdr.request = VHOST_USER_SET_MEM_TABLE,
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.hdr.flags = VHOST_USER_VERSION,
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};
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if (reply_supported) {
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msg.flags |= VHOST_USER_NEED_REPLY_MASK;
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msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK;
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}
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for (i = 0; i < dev->mem->nregions; ++i) {
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@ -355,9 +359,9 @@ static int vhost_user_set_mem_table(struct vhost_dev *dev,
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return -1;
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}
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msg.size = sizeof(msg.payload.memory.nregions);
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msg.size += sizeof(msg.payload.memory.padding);
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msg.size += fd_num * sizeof(VhostUserMemoryRegion);
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msg.hdr.size = sizeof(msg.payload.memory.nregions);
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msg.hdr.size += sizeof(msg.payload.memory.padding);
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msg.hdr.size += fd_num * sizeof(VhostUserMemoryRegion);
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if (vhost_user_write(dev, &msg, fds, fd_num) < 0) {
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return -1;
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@ -374,10 +378,10 @@ static int vhost_user_set_vring_addr(struct vhost_dev *dev,
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struct vhost_vring_addr *addr)
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{
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VhostUserMsg msg = {
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.request = VHOST_USER_SET_VRING_ADDR,
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.flags = VHOST_USER_VERSION,
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.hdr.request = VHOST_USER_SET_VRING_ADDR,
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.hdr.flags = VHOST_USER_VERSION,
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.payload.addr = *addr,
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.size = sizeof(msg.payload.addr),
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.hdr.size = sizeof(msg.payload.addr),
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};
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if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
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@ -393,10 +397,10 @@ static int vhost_user_set_vring_endian(struct vhost_dev *dev,
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bool cross_endian = virtio_has_feature(dev->protocol_features,
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VHOST_USER_PROTOCOL_F_CROSS_ENDIAN);
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VhostUserMsg msg = {
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.request = VHOST_USER_SET_VRING_ENDIAN,
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.flags = VHOST_USER_VERSION,
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.hdr.request = VHOST_USER_SET_VRING_ENDIAN,
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.hdr.flags = VHOST_USER_VERSION,
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.payload.state = *ring,
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.size = sizeof(msg.payload.state),
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.hdr.size = sizeof(msg.payload.state),
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};
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if (!cross_endian) {
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@ -416,10 +420,10 @@ static int vhost_set_vring(struct vhost_dev *dev,
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struct vhost_vring_state *ring)
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{
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VhostUserMsg msg = {
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.request = request,
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.flags = VHOST_USER_VERSION,
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.hdr.request = request,
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.hdr.flags = VHOST_USER_VERSION,
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.payload.state = *ring,
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.size = sizeof(msg.payload.state),
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.hdr.size = sizeof(msg.payload.state),
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};
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if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
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@ -465,10 +469,10 @@ static int vhost_user_get_vring_base(struct vhost_dev *dev,
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struct vhost_vring_state *ring)
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{
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VhostUserMsg msg = {
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.request = VHOST_USER_GET_VRING_BASE,
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.flags = VHOST_USER_VERSION,
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.hdr.request = VHOST_USER_GET_VRING_BASE,
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.hdr.flags = VHOST_USER_VERSION,
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.payload.state = *ring,
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.size = sizeof(msg.payload.state),
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.hdr.size = sizeof(msg.payload.state),
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};
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if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
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@ -479,13 +483,13 @@ static int vhost_user_get_vring_base(struct vhost_dev *dev,
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return -1;
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}
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if (msg.request != VHOST_USER_GET_VRING_BASE) {
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if (msg.hdr.request != VHOST_USER_GET_VRING_BASE) {
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error_report("Received unexpected msg type. Expected %d received %d",
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VHOST_USER_GET_VRING_BASE, msg.request);
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VHOST_USER_GET_VRING_BASE, msg.hdr.request);
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return -1;
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}
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if (msg.size != sizeof(msg.payload.state)) {
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if (msg.hdr.size != sizeof(msg.payload.state)) {
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error_report("Received bad msg size.");
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return -1;
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}
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@ -502,10 +506,10 @@ static int vhost_set_vring_file(struct vhost_dev *dev,
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int fds[VHOST_MEMORY_MAX_NREGIONS];
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size_t fd_num = 0;
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VhostUserMsg msg = {
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.request = request,
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.flags = VHOST_USER_VERSION,
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.hdr.request = request,
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.hdr.flags = VHOST_USER_VERSION,
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.payload.u64 = file->index & VHOST_USER_VRING_IDX_MASK,
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.size = sizeof(msg.payload.u64),
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.hdr.size = sizeof(msg.payload.u64),
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};
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if (ioeventfd_enabled() && file->fd > 0) {
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@ -536,10 +540,10 @@ static int vhost_user_set_vring_call(struct vhost_dev *dev,
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static int vhost_user_set_u64(struct vhost_dev *dev, int request, uint64_t u64)
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{
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VhostUserMsg msg = {
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.request = request,
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.flags = VHOST_USER_VERSION,
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.hdr.request = request,
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.hdr.flags = VHOST_USER_VERSION,
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.payload.u64 = u64,
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.size = sizeof(msg.payload.u64),
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.hdr.size = sizeof(msg.payload.u64),
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};
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if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
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@ -564,8 +568,8 @@ static int vhost_user_set_protocol_features(struct vhost_dev *dev,
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static int vhost_user_get_u64(struct vhost_dev *dev, int request, uint64_t *u64)
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{
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VhostUserMsg msg = {
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.request = request,
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.flags = VHOST_USER_VERSION,
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.hdr.request = request,
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.hdr.flags = VHOST_USER_VERSION,
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};
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if (vhost_user_one_time_request(request) && dev->vq_index != 0) {
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@ -580,13 +584,13 @@ static int vhost_user_get_u64(struct vhost_dev *dev, int request, uint64_t *u64)
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return -1;
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}
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if (msg.request != request) {
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if (msg.hdr.request != request) {
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error_report("Received unexpected msg type. Expected %d received %d",
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request, msg.request);
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request, msg.hdr.request);
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return -1;
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}
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if (msg.size != sizeof(msg.payload.u64)) {
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if (msg.hdr.size != sizeof(msg.payload.u64)) {
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error_report("Received bad msg size.");
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return -1;
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}
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@ -604,8 +608,8 @@ static int vhost_user_get_features(struct vhost_dev *dev, uint64_t *features)
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static int vhost_user_set_owner(struct vhost_dev *dev)
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{
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VhostUserMsg msg = {
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.request = VHOST_USER_SET_OWNER,
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.flags = VHOST_USER_VERSION,
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.hdr.request = VHOST_USER_SET_OWNER,
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.hdr.flags = VHOST_USER_VERSION,
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};
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if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
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@ -618,8 +622,8 @@ static int vhost_user_set_owner(struct vhost_dev *dev)
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static int vhost_user_reset_device(struct vhost_dev *dev)
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{
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VhostUserMsg msg = {
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.request = VHOST_USER_RESET_OWNER,
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.flags = VHOST_USER_VERSION,
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.hdr.request = VHOST_USER_RESET_OWNER,
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.hdr.flags = VHOST_USER_VERSION,
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};
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if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
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@ -658,21 +662,21 @@ static void slave_read(void *opaque)
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goto err;
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}
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if (msg.size > VHOST_USER_PAYLOAD_SIZE) {
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if (msg.hdr.size > VHOST_USER_PAYLOAD_SIZE) {
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error_report("Failed to read msg header."
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" Size %d exceeds the maximum %zu.", msg.size,
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" Size %d exceeds the maximum %zu.", msg.hdr.size,
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VHOST_USER_PAYLOAD_SIZE);
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goto err;
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}
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/* Read payload */
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size = read(u->slave_fd, &msg.payload, msg.size);
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if (size != msg.size) {
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size = read(u->slave_fd, &msg.payload, msg.hdr.size);
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if (size != msg.hdr.size) {
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error_report("Failed to read payload from slave.");
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goto err;
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}
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switch (msg.request) {
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switch (msg.hdr.request) {
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case VHOST_USER_SLAVE_IOTLB_MSG:
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ret = vhost_backend_handle_iotlb_msg(dev, &msg.payload.iotlb);
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break;
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@ -688,15 +692,15 @@ static void slave_read(void *opaque)
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* REPLY_ACK feature handling. Other reply types has to be managed
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* directly in their request handlers.
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*/
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if (msg.flags & VHOST_USER_NEED_REPLY_MASK) {
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msg.flags &= ~VHOST_USER_NEED_REPLY_MASK;
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msg.flags |= VHOST_USER_REPLY_MASK;
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if (msg.hdr.flags & VHOST_USER_NEED_REPLY_MASK) {
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msg.hdr.flags &= ~VHOST_USER_NEED_REPLY_MASK;
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msg.hdr.flags |= VHOST_USER_REPLY_MASK;
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msg.payload.u64 = !!ret;
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msg.size = sizeof(msg.payload.u64);
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msg.hdr.size = sizeof(msg.payload.u64);
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size = write(u->slave_fd, &msg, VHOST_USER_HDR_SIZE + msg.size);
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if (size != VHOST_USER_HDR_SIZE + msg.size) {
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size = write(u->slave_fd, &msg, VHOST_USER_HDR_SIZE + msg.hdr.size);
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if (size != VHOST_USER_HDR_SIZE + msg.hdr.size) {
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error_report("Failed to send msg reply to slave.");
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goto err;
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}
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@ -714,8 +718,8 @@ err:
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static int vhost_setup_slave_channel(struct vhost_dev *dev)
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{
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VhostUserMsg msg = {
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.request = VHOST_USER_SET_SLAVE_REQ_FD,
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.flags = VHOST_USER_VERSION,
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.hdr.request = VHOST_USER_SET_SLAVE_REQ_FD,
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.hdr.flags = VHOST_USER_VERSION,
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};
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struct vhost_user *u = dev->opaque;
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int sv[2], ret = 0;
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@ -736,7 +740,7 @@ static int vhost_setup_slave_channel(struct vhost_dev *dev)
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qemu_set_fd_handler(u->slave_fd, slave_read, NULL, dev);
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if (reply_supported) {
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msg.flags |= VHOST_USER_NEED_REPLY_MASK;
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msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK;
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}
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ret = vhost_user_write(dev, &msg, &sv[1], 1);
|
||||
@ -881,10 +885,10 @@ static int vhost_user_migration_done(struct vhost_dev *dev, char* mac_addr)
|
||||
/* if backend supports VHOST_USER_PROTOCOL_F_RARP ask it to send the RARP */
|
||||
if (virtio_has_feature(dev->protocol_features,
|
||||
VHOST_USER_PROTOCOL_F_RARP)) {
|
||||
msg.request = VHOST_USER_SEND_RARP;
|
||||
msg.flags = VHOST_USER_VERSION;
|
||||
msg.hdr.request = VHOST_USER_SEND_RARP;
|
||||
msg.hdr.flags = VHOST_USER_VERSION;
|
||||
memcpy((char *)&msg.payload.u64, mac_addr, 6);
|
||||
msg.size = sizeof(msg.payload.u64);
|
||||
msg.hdr.size = sizeof(msg.payload.u64);
|
||||
|
||||
return vhost_user_write(dev, &msg, NULL, 0);
|
||||
}
|
||||
@ -918,12 +922,12 @@ static int vhost_user_net_set_mtu(struct vhost_dev *dev, uint16_t mtu)
|
||||
return 0;
|
||||
}
|
||||
|
||||
msg.request = VHOST_USER_NET_SET_MTU;
|
||||
msg.hdr.request = VHOST_USER_NET_SET_MTU;
|
||||
msg.payload.u64 = mtu;
|
||||
msg.size = sizeof(msg.payload.u64);
|
||||
msg.flags = VHOST_USER_VERSION;
|
||||
msg.hdr.size = sizeof(msg.payload.u64);
|
||||
msg.hdr.flags = VHOST_USER_VERSION;
|
||||
if (reply_supported) {
|
||||
msg.flags |= VHOST_USER_NEED_REPLY_MASK;
|
||||
msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK;
|
||||
}
|
||||
|
||||
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
|
||||
@ -942,9 +946,9 @@ static int vhost_user_send_device_iotlb_msg(struct vhost_dev *dev,
|
||||
struct vhost_iotlb_msg *imsg)
|
||||
{
|
||||
VhostUserMsg msg = {
|
||||
.request = VHOST_USER_IOTLB_MSG,
|
||||
.size = sizeof(msg.payload.iotlb),
|
||||
.flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY_MASK,
|
||||
.hdr.request = VHOST_USER_IOTLB_MSG,
|
||||
.hdr.size = sizeof(msg.payload.iotlb),
|
||||
.hdr.flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY_MASK,
|
||||
.payload.iotlb = *imsg,
|
||||
};
|
||||
|
||||
@ -965,9 +969,9 @@ static int vhost_user_get_config(struct vhost_dev *dev, uint8_t *config,
|
||||
uint32_t config_len)
|
||||
{
|
||||
VhostUserMsg msg = {
|
||||
msg.request = VHOST_USER_GET_CONFIG,
|
||||
msg.flags = VHOST_USER_VERSION,
|
||||
msg.size = VHOST_USER_CONFIG_HDR_SIZE + config_len,
|
||||
.hdr.request = VHOST_USER_GET_CONFIG,
|
||||
.hdr.flags = VHOST_USER_VERSION,
|
||||
.hdr.size = VHOST_USER_CONFIG_HDR_SIZE + config_len,
|
||||
};
|
||||
|
||||
if (config_len > VHOST_USER_MAX_CONFIG_SIZE) {
|
||||
@ -984,13 +988,13 @@ static int vhost_user_get_config(struct vhost_dev *dev, uint8_t *config,
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (msg.request != VHOST_USER_GET_CONFIG) {
|
||||
if (msg.hdr.request != VHOST_USER_GET_CONFIG) {
|
||||
error_report("Received unexpected msg type. Expected %d received %d",
|
||||
VHOST_USER_GET_CONFIG, msg.request);
|
||||
VHOST_USER_GET_CONFIG, msg.hdr.request);
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (msg.size != VHOST_USER_CONFIG_HDR_SIZE + config_len) {
|
||||
if (msg.hdr.size != VHOST_USER_CONFIG_HDR_SIZE + config_len) {
|
||||
error_report("Received bad msg size.");
|
||||
return -1;
|
||||
}
|
||||
@ -1008,13 +1012,13 @@ static int vhost_user_set_config(struct vhost_dev *dev, const uint8_t *data,
|
||||
VHOST_USER_PROTOCOL_F_REPLY_ACK);
|
||||
|
||||
VhostUserMsg msg = {
|
||||
msg.request = VHOST_USER_SET_CONFIG,
|
||||
msg.flags = VHOST_USER_VERSION,
|
||||
msg.size = VHOST_USER_CONFIG_HDR_SIZE + size,
|
||||
.hdr.request = VHOST_USER_SET_CONFIG,
|
||||
.hdr.flags = VHOST_USER_VERSION,
|
||||
.hdr.size = VHOST_USER_CONFIG_HDR_SIZE + size,
|
||||
};
|
||||
|
||||
if (reply_supported) {
|
||||
msg.flags |= VHOST_USER_NEED_REPLY_MASK;
|
||||
msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK;
|
||||
}
|
||||
|
||||
if (size > VHOST_USER_MAX_CONFIG_SIZE) {
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user