On Tue, Nov 17, 2020 at 12:50:31PM -0600, Tyrel Datwyler wrote:
> The vfcFrame correlation field is 64bit handle that is intended to trace
> I/O operations through both the client stack and VIOS stack when the
> underlying physical FC adapter supports tagging.
>
> Tag vfcFrames with the associated ibmvfc_event pointer handle.
>
> Signed-off-by: Tyrel Datwyler <tyreld@xxxxxxxxxxxxx>
> ---
> drivers/scsi/ibmvscsi/ibmvfc.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
> index 0cab4b852b48..3922441a117d 100644
> --- a/drivers/scsi/ibmvscsi/ibmvfc.c
> +++ b/drivers/scsi/ibmvscsi/ibmvfc.c
> @@ -1693,6 +1693,8 @@ static int ibmvfc_queuecommand_lck(struct scsi_cmnd *cmnd,
> vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
> }
>
> + vfc_cmd->correlation = cpu_to_be64(evt);
> +
> if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
> return ibmvfc_send_event(evt, vhost, 0);
>
> @@ -2370,6 +2372,8 @@ static int ibmvfc_abort_task_set(struct scsi_device *sdev)
> tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
> evt->sync_iu = &rsp_iu;
>
> + tmf->correlation = cpu_to_be64(evt);
> +
> init_completion(&evt->comp);
> rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
> }
> --
> 2.27.0
>
This patch introduces a clang warning, is this intentional behavior?
$ make -skj"$(nproc)" ARCH=powerpc CROSS_COMPILE=powerpc64le-linux-gnu- LLVM=1 O=out distclean ppc64le_defconfig drivers/scsi/ibmvscsi/ibmvfc.o
Using ../arch/powerpc/configs/ppc64_defconfig as base
Merging ../arch/powerpc/configs/le.config
#
# merged configuration written to .config (needs make)
#
../drivers/scsi/ibmvscsi/ibmvfc.c:1747:25: warning: incompatible pointer to integer conversion passing 'struct ibmvfc_event *' to parameter of type '__u64' (aka 'unsigned long long') [-Wint-conversion]
vfc_cmd->correlation = cpu_to_be64(evt);
^~~~~~~~~~~~~~~~
../include/linux/byteorder/generic.h:92:21: note: expanded from macro 'cpu_to_be64'
#define cpu_to_be64 __cpu_to_be64
^
../include/uapi/linux/byteorder/little_endian.h:37:52: note: expanded from macro '__cpu_to_be64'
#define __cpu_to_be64(x) ((__force __be64)__swab64((x)))
~~~~~~~~~^~~~
../include/uapi/linux/swab.h:133:12: note: expanded from macro '__swab64'
__fswab64(x))
^
../include/uapi/linux/swab.h:66:57: note: passing argument to parameter 'val' here
static inline __attribute_const__ __u64 __fswab64(__u64 val)
^
../drivers/scsi/ibmvscsi/ibmvfc.c:2421:22: warning: incompatible pointer to integer conversion passing 'struct ibmvfc_event *' to parameter of type '__u64' (aka 'unsigned long long') [-Wint-conversion]
tmf->correlation = cpu_to_be64(evt);
^~~~~~~~~~~~~~~~
../include/linux/byteorder/generic.h:92:21: note: expanded from macro 'cpu_to_be64'
#define cpu_to_be64 __cpu_to_be64
^
../include/uapi/linux/byteorder/little_endian.h:37:52: note: expanded from macro '__cpu_to_be64'
#define __cpu_to_be64(x) ((__force __be64)__swab64((x)))
~~~~~~~~~^~~~
../include/uapi/linux/swab.h:133:12: note: expanded from macro '__swab64'
__fswab64(x))
^
../include/uapi/linux/swab.h:66:57: note: passing argument to parameter 'val' here
static inline __attribute_const__ __u64 __fswab64(__u64 val)
^
2 warnings generated.
Cheers,
Nathan
