diff options
Diffstat (limited to 'drivers/hv/channel_mgmt.c')
-rw-r--r-- | drivers/hv/channel_mgmt.c | 73 |
1 files changed, 47 insertions, 26 deletions
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c index 9ffbfc575a0..2b8b8d4558d 100644 --- a/drivers/hv/channel_mgmt.c +++ b/drivers/hv/channel_mgmt.c @@ -46,40 +46,61 @@ struct vmbus_channel_message_table_entry { * * @icmsghdrp is of type &struct icmsg_hdr. * @negop is of type &struct icmsg_negotiate. - * Set up and fill in default negotiate response message. This response can - * come from both the vmbus driver and the hv_utils driver. The current api - * will respond properly to both Windows 2008 and Windows 2008-R2 operating - * systems. + * Set up and fill in default negotiate response message. + * + * The max_fw_version specifies the maximum framework version that + * we can support and max _srv_version specifies the maximum service + * version we can support. A special value MAX_SRV_VER can be + * specified to indicate that we can handle the maximum version + * exposed by the host. * * Mainly used by Hyper-V drivers. */ void vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, - struct icmsg_negotiate *negop, u8 *buf) + struct icmsg_negotiate *negop, u8 *buf, + int max_fw_version, int max_srv_version) { - if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) { - icmsghdrp->icmsgsize = 0x10; - - negop = (struct icmsg_negotiate *)&buf[ - sizeof(struct vmbuspipe_hdr) + - sizeof(struct icmsg_hdr)]; - - if (negop->icframe_vercnt == 2 && - negop->icversion_data[1].major == 3) { - negop->icversion_data[0].major = 3; - negop->icversion_data[0].minor = 0; - negop->icversion_data[1].major = 3; - negop->icversion_data[1].minor = 0; - } else { - negop->icversion_data[0].major = 1; - negop->icversion_data[0].minor = 0; - negop->icversion_data[1].major = 1; - negop->icversion_data[1].minor = 0; - } + int icframe_vercnt; + int icmsg_vercnt; + int i; + + icmsghdrp->icmsgsize = 0x10; + + negop = (struct icmsg_negotiate *)&buf[ + sizeof(struct vmbuspipe_hdr) + + sizeof(struct icmsg_hdr)]; + + icframe_vercnt = negop->icframe_vercnt; + icmsg_vercnt = negop->icmsg_vercnt; + + /* + * Select the framework version number we will + * support. + */ + + for (i = 0; i < negop->icframe_vercnt; i++) { + if (negop->icversion_data[i].major <= max_fw_version) + icframe_vercnt = negop->icversion_data[i].major; + } - negop->icframe_vercnt = 1; - negop->icmsg_vercnt = 1; + for (i = negop->icframe_vercnt; + (i < negop->icframe_vercnt + negop->icmsg_vercnt); i++) { + if (negop->icversion_data[i].major <= max_srv_version) + icmsg_vercnt = negop->icversion_data[i].major; } + + /* + * Respond with the maximum framework and service + * version numbers we can support. + */ + negop->icframe_vercnt = 1; + negop->icmsg_vercnt = 1; + negop->icversion_data[0].major = icframe_vercnt; + negop->icversion_data[0].minor = 0; + negop->icversion_data[1].major = icmsg_vercnt; + negop->icversion_data[1].minor = 0; } + EXPORT_SYMBOL_GPL(vmbus_prep_negotiate_resp); /* |