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Date: Wed, 4 Sep 2013 17:33:03 +0000
From: KY Srinivasan <kys@...rosoft.com>
To: Olaf Hering <olaf@...fle.de>
CC: "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/1] Drivers: hv: util: Fix a bug in version negotiation
code for util services
> -----Original Message-----
> From: Olaf Hering [mailto:olaf@...fle.de]
> Sent: Wednesday, September 04, 2013 8:07 AM
> To: KY Srinivasan
> Cc: gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH 1/1] Drivers: hv: util: Fix a bug in version negotiation code for
> util services
>
> On Wed, Sep 04, Olaf Hering wrote:
>
> > I suggest to let callers deal with error handling. Also as a cleanup,
> > vmbus_prep_negotiate_resp does not make use of the negop passed to it.
> > So that arg can be removed.
>
> Simplify vmbus_prep_negotiate_resp. If we take the optimistic approach
> that negotiation will not fail for any of the callers of
> vmbus_prep_negotiate_resp this patch on top of yours should fix 2008 and
> 2012r2.
Thanks Olaf. I would prefer that we explicitly fail the negotiations than assume that it will succeed.
Essentially, I want the same behavior as what we had before but only for the final version being
negotiated. If it is ok with you, I can spin up the patch and send it out.
Regards,
K. Y
>
> Olaf
>
> ---
> drivers/hv/channel_mgmt.c | 22 +++++++++-------------
> drivers/hv/hv_kvp.c | 8 ++++----
> drivers/hv/hv_snapshot.c | 3 +--
> drivers/hv/hv_util.c | 7 +++----
> include/linux/hyperv.h | 4 +---
> 5 files changed, 18 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
> index 12ec8c8..dcaad3e 100644
> --- a/drivers/hv/channel_mgmt.c
> +++ b/drivers/hv/channel_mgmt.c
> @@ -41,7 +41,6 @@ struct vmbus_channel_message_table_entry {
> /**
> * vmbus_prep_negotiate_resp() - Create default response for Hyper-V
> Negotiate message
> * @icmsghdrp: Pointer to msg header structure
> - * @icmsg_negotiate: Pointer to negotiate message structure
> * @buf: Raw buffer channel data
> *
> * @icmsghdrp is of type &struct icmsg_hdr.
> @@ -54,10 +53,10 @@ struct vmbus_channel_message_table_entry {
> *
> * Mainly used by Hyper-V drivers.
> */
> -bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp,
> - struct icmsg_negotiate *negop, u8 *buf,
> +bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, u8 *buf,
> int fw_version, int srv_version)
> {
> + struct icmsg_negotiate *negop;
> int icframe_major, icframe_minor;
> int icmsg_major, icmsg_minor;
> int fw_major, fw_minor;
> @@ -65,7 +64,6 @@ bool vmbus_prep_negotiate_resp(struct icmsg_hdr
> *icmsghdrp,
> int i;
> bool found_match = false;
>
> - icmsghdrp->icmsgsize = 0x10;
> fw_major = (fw_version >> 16);
> fw_minor = (fw_version & 0xFFFF);
>
> @@ -116,19 +114,17 @@ bool vmbus_prep_negotiate_resp(struct icmsg_hdr
> *icmsghdrp,
> * version numbers we can support.
> */
>
> -fw_error:
> - if (!found_match) {
> - negop->icframe_vercnt = 0;
> - negop->icmsg_vercnt = 0;
> - } else {
> + if (found_match) {
> + icmsghdrp->icmsgsize = 0x10;
> negop->icframe_vercnt = 1;
> negop->icmsg_vercnt = 1;
> + negop->icversion_data[0].major = icframe_major;
> + negop->icversion_data[0].minor = icframe_minor;
> + negop->icversion_data[1].major = icmsg_major;
> + negop->icversion_data[1].minor = icmsg_minor;
> }
>
> - negop->icversion_data[0].major = icframe_major;
> - negop->icversion_data[0].minor = icframe_minor;
> - negop->icversion_data[1].major = icmsg_major;
> - negop->icversion_data[1].minor = icmsg_minor;
> +fw_error:
> return found_match;
> }
>
> diff --git a/drivers/hv/hv_kvp.c b/drivers/hv/hv_kvp.c
> index 5312720..31e338a 100644
> --- a/drivers/hv/hv_kvp.c
> +++ b/drivers/hv/hv_kvp.c
> @@ -584,7 +584,6 @@ void hv_kvp_onchannelcallback(void *context)
> struct hv_kvp_msg *kvp_msg;
>
> struct icmsg_hdr *icmsghdrp;
> - struct icmsg_negotiate *negop = NULL;
>
> if (kvp_transaction.active) {
> /*
> @@ -607,14 +606,15 @@ void hv_kvp_onchannelcallback(void *context)
> * We start with win8 version and if the host cannot
> * support that we use the previous version.
> */
> - if (vmbus_prep_negotiate_resp(icmsghdrp, negop,
> + if (vmbus_prep_negotiate_resp(icmsghdrp,
> recv_buffer, UTIL_FW_MAJOR_MINOR,
> WIN8_SRV_MAJOR_MINOR))
> goto done;
>
> - vmbus_prep_negotiate_resp(icmsghdrp, negop,
> + if (vmbus_prep_negotiate_resp(icmsghdrp,
> recv_buffer, UTIL_FW_MAJOR_MINOR,
> - WIN7_SRV_MAJOR_MINOR);
> + WIN7_SRV_MAJOR_MINOR))
> + goto done;
>
> } else {
> kvp_msg = (struct hv_kvp_msg *)&recv_buffer[
> diff --git a/drivers/hv/hv_snapshot.c b/drivers/hv/hv_snapshot.c
> index e4572f3..51e8203 100644
> --- a/drivers/hv/hv_snapshot.c
> +++ b/drivers/hv/hv_snapshot.c
> @@ -170,7 +170,6 @@ void hv_vss_onchannelcallback(void *context)
>
>
> struct icmsg_hdr *icmsghdrp;
> - struct icmsg_negotiate *negop = NULL;
>
> if (vss_transaction.active) {
> /*
> @@ -189,7 +188,7 @@ void hv_vss_onchannelcallback(void *context)
> sizeof(struct vmbuspipe_hdr)];
>
> if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
> - vmbus_prep_negotiate_resp(icmsghdrp, negop,
> + vmbus_prep_negotiate_resp(icmsghdrp,
> recv_buffer, UTIL_FW_MAJOR_MINOR,
> VSS_MAJOR_MINOR);
> } else {
> diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c
> index c16164d..01d7b17 100644
> --- a/drivers/hv/hv_util.c
> +++ b/drivers/hv/hv_util.c
> @@ -88,7 +88,6 @@ static void shutdown_onchannelcallback(void *context)
> struct shutdown_msg_data *shutdown_msg;
>
> struct icmsg_hdr *icmsghdrp;
> - struct icmsg_negotiate *negop = NULL;
>
> vmbus_recvpacket(channel, shut_txf_buf,
> PAGE_SIZE, &recvlen, &requestid);
> @@ -98,7 +97,7 @@ static void shutdown_onchannelcallback(void *context)
> sizeof(struct vmbuspipe_hdr)];
>
> if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
> - vmbus_prep_negotiate_resp(icmsghdrp, negop,
> + vmbus_prep_negotiate_resp(icmsghdrp,
> shut_txf_buf, UTIL_FW_MAJOR_MINOR,
> SHUTDOWN_MAJOR_MINOR);
> } else {
> @@ -225,7 +224,7 @@ static void timesync_onchannelcallback(void *context)
> sizeof(struct vmbuspipe_hdr)];
>
> if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
> - vmbus_prep_negotiate_resp(icmsghdrp, NULL,
> time_txf_buf,
> + vmbus_prep_negotiate_resp(icmsghdrp, time_txf_buf,
> UTIL_FW_MAJOR_MINOR,
> TIMESYNCH_MAJOR_MINOR);
> } else {
> @@ -266,7 +265,7 @@ static void heartbeat_onchannelcallback(void *context)
> sizeof(struct vmbuspipe_hdr)];
>
> if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
> - vmbus_prep_negotiate_resp(icmsghdrp, NULL,
> + vmbus_prep_negotiate_resp(icmsghdrp,
> hbeat_txf_buf, UTIL_FW_MAJOR_MINOR,
> HEARTBEAT_MAJOR_MINOR);
> } else {
> diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
> index 4994907..084a858 100644
> --- a/include/linux/hyperv.h
> +++ b/include/linux/hyperv.h
> @@ -1502,9 +1502,7 @@ struct hyperv_service_callback {
> };
>
> #define MAX_SRV_VER 0x7ffffff
> -extern bool vmbus_prep_negotiate_resp(struct icmsg_hdr *,
> - struct icmsg_negotiate *, u8 *, int,
> - int);
> +extern bool vmbus_prep_negotiate_resp(struct icmsg_hdr *, u8 *, int, int);
>
> int hv_kvp_init(struct hv_util_service *);
> void hv_kvp_deinit(void);
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