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nvmf/vfio-user: only kick controller when in interrupt mode

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There is a race condition if we call this function in the
polling mode when running with multi-cores, same as other
places where the function is called, we only kick controller
in interrupt mode, also in `vfio_user_ctrlr_intr`,
`ctrlr->sqs[0]` may be set to NULL after the controller
poll call, so return earlier for this case.

Change-Id: I03a7b74a39c966a2b8be610bca0e492d902f6b08
Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/13696
Community-CI: Mellanox Build Bot
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Dong Yi <dongx.yi@intel.com>
This commit is contained in:
Changpeng Liu 2022-07-18 12:04:07 +08:00 committed by Jim Harris
parent 6212597bda
commit 91eb10b4be
1 changed files with 16 additions and 8 deletions
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24
lib/nvmf/vfio_user.c
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@ -2918,6 +2918,13 @@ struct ctrlr_quiesce_ctx {
static void ctrlr_quiesce(struct nvmf_vfio_user_ctrlr *vu_ctrlr);
static inline bool
in_interrupt_mode(struct nvmf_vfio_user_transport *vu_transport)
{
return spdk_interrupt_mode_is_enabled() &&
vu_transport->intr_mode_supported;
}
static void
_vfio_user_endpoint_resume_done_msg(void *ctx)
{
@ -2938,7 +2945,9 @@ _vfio_user_endpoint_resume_done_msg(void *ctx)
* kick ourselves so we'll definitely check again while in
* VFIO_USER_CTRLR_RUNNING state.
*/
ctrlr_kick(vu_ctrlr);
if (in_interrupt_mode(endpoint->transport)) {
ctrlr_kick(vu_ctrlr);
}
return;
}
@ -4549,13 +4558,6 @@ nvmf_vfio_user_poll_group_create(struct spdk_nvmf_transport *transport,
return &vu_group->group;
}
static bool
in_interrupt_mode(struct nvmf_vfio_user_transport *vu_transport)
{
return spdk_interrupt_mode_is_enabled() &&
vu_transport->intr_mode_supported;
}
static struct spdk_nvmf_transport_poll_group *
nvmf_vfio_user_get_optimal_poll_group(struct spdk_nvmf_qpair *qpair)
{
@ -4765,6 +4767,12 @@ vfio_user_ctrlr_intr(void *ctx)
* Poll vfio-user for this controller.
*/
ret = vfio_user_poll_vfu_ctx(ctrlr);
/* `sqs[0]` could be set to NULL in vfio_user_poll_vfu_ctx() context, just return
* for this case.
*/
if (ctrlr->sqs[0] == NULL) {
return ret;
}
vu_group = ctrlr_to_poll_group(ctrlr);