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nvmf/vfio-user: refactor set_ctrlr_intr_mode()

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This function is really about re-arming all SQs for a poll group;
refactor to reflect this.

This is necessary ground-work before we can support multiple reactors in
vfio_user.c in interrupt mode.

Signed-off-by: John Levon <john.levon@nutanix.com>
Change-Id: I170fae2076fc80e742926cf448973671ac9e3bd9
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/12664
Community-CI: Broadcom CI <spdk-ci.pdl@broadcom.com>
Community-CI: Mellanox Build Bot
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
John Levon 2022-04-28 16:11:22 +00:00 committed by Jim Harris
parent a985a3ae01
commit fa4ddd2d8c
1 changed files with 44 additions and 35 deletions
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71
lib/nvmf/vfio_user.c
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@ -577,6 +577,15 @@ io_q_exists(struct nvmf_vfio_user_ctrlr *vu_ctrlr, const uint16_t qid, const boo
vu_ctrlr->sqs[qid]->sq_state != VFIO_USER_SQ_UNUSED);
}
/* Return the poll group for the admin queue of the controller. */
static inline struct nvmf_vfio_user_poll_group *
ctrlr_to_poll_group(struct nvmf_vfio_user_ctrlr *vu_ctrlr)
{
return SPDK_CONTAINEROF(vu_ctrlr->sqs[0]->group,
struct nvmf_vfio_user_poll_group,
group);
}
static inline size_t
vfio_user_migr_data_len(void)
{
@ -1419,15 +1428,13 @@ nvmf_vfio_user_sq_poll(struct nvmf_vfio_user_sq *sq);
* processed some SQ entries.
*/
static int
set_sq_intr_mode(struct nvmf_vfio_user_ctrlr *ctrlr,
vfio_user_sq_rearm(struct nvmf_vfio_user_ctrlr *ctrlr,
struct nvmf_vfio_user_sq *sq)
{
int count = 0;
size_t i;
if (!sq->need_rearm) {
return 0;
}
assert(sq->need_rearm);
for (i = 0; i < NVMF_VFIO_USER_SET_EVENTIDX_MAX_ATTEMPTS; i++) {
int ret;
@ -1480,30 +1487,19 @@ set_sq_intr_mode(struct nvmf_vfio_user_ctrlr *ctrlr,
* Returns non-zero if we processed something.
*/
static int
set_ctrlr_intr_mode(struct nvmf_vfio_user_ctrlr *ctrlr)
vfio_user_poll_group_rearm(struct nvmf_vfio_user_poll_group *vu_group)
{
struct nvmf_vfio_user_sq *sq;
int count = 0;
assert(ctrlr != NULL);
if (ctrlr->sdbl == NULL) {
return 0;
}
/*
* The admin queue (qid: 0) doesn't use the shadow doorbell buffer, so
* skip it.
*/
for (size_t i = 1; i < NVMF_VFIO_USER_DEFAULT_MAX_QPAIRS_PER_CTRLR; ++i) {
struct nvmf_vfio_user_sq *sq = ctrlr->sqs[i];
if (sq == NULL ||
sq->sq_state != VFIO_USER_SQ_ACTIVE ||
!sq->size) {
TAILQ_FOREACH(sq, &vu_group->sqs, link) {
if (spdk_unlikely(sq->sq_state != VFIO_USER_SQ_ACTIVE || !sq->size)) {
continue;
}
count += set_sq_intr_mode(ctrlr, ctrlr->sqs[i]);
if (sq->need_rearm) {
count += vfio_user_sq_rearm(sq->ctrlr, sq);
}
}
return count;
@ -2280,7 +2276,7 @@ handle_doorbell_buffer_config(struct nvmf_vfio_user_ctrlr *ctrlr, struct spdk_nv
vfio_user_ctrlr_switch_doorbells(ctrlr, true);
/* Update event index buffer and poll queues if necessary. */
set_ctrlr_intr_mode(ctrlr);
vfio_user_poll_group_rearm(ctrlr_to_poll_group(ctrlr));
sc = SPDK_NVME_SC_SUCCESS;
@ -2382,11 +2378,13 @@ handle_sq_tdbl_write(struct nvmf_vfio_user_ctrlr *ctrlr, const uint32_t new_tail
assert(ctrlr != NULL);
assert(sq != NULL);
if (ctrlr->sdbl != NULL) {
/*
* Submission queue index has moved past the event index, so it needs to
* be re-armed before we go to sleep.
* Submission queue index has moved past the event index, so it
* needs to be re-armed before we go to sleep.
*/
sq->need_rearm = true;
}
queue = q_addr(&sq->mapping);
while (*sq_headp(sq) != new_tail) {
@ -4579,11 +4577,16 @@ _post_completion_msg(void *ctx)
static int nvmf_vfio_user_poll_group_poll(struct spdk_nvmf_transport_poll_group *group);
static int set_ctrlr_intr_mode(struct nvmf_vfio_user_ctrlr *ctrlr);
static int vfio_user_poll_group_rearm(struct nvmf_vfio_user_poll_group *vu_group);
/*
* Handle an interrupt for the given controller: we must poll the vfu_ctx, and
* the SQs assigned to our poll group.
*/
static int
vfio_user_ctrlr_intr(void *ctx)
{
struct nvmf_vfio_user_poll_group *vu_group;
struct nvmf_vfio_user_ctrlr *ctrlr = ctx;
int ret = 0;
@ -4596,7 +4599,9 @@ vfio_user_ctrlr_intr(void *ctx)
/*
* Poll vfio-user for this controller.
*/
vfio_user_poll_vfu_ctx(ctrlr);
ret = vfio_user_poll_vfu_ctx(ctrlr);
vu_group = ctrlr_to_poll_group(ctrlr);
/*
* See nvmf_vfio_user_get_optimal_poll_group() for why it's OK to only
@ -4606,10 +4611,13 @@ vfio_user_ctrlr_intr(void *ctx)
* (since a single poll group can have SQs from multiple separate
* controllers).
*/
ret |= nvmf_vfio_user_poll_group_poll(ctrlr->sqs[0]->group);
ret |= nvmf_vfio_user_poll_group_poll(&vu_group->group);
/* Re-arm the event indexes. */
ret |= set_ctrlr_intr_mode(ctrlr);
/*
* Re-arm the event indexes. NB: this also could rearm other
* controller's SQs.
*/
ret |= vfio_user_poll_group_rearm(vu_group);
return ret != 0 ? SPDK_POLLER_BUSY : SPDK_POLLER_IDLE;
}
@ -4630,7 +4638,8 @@ vfio_user_set_intr_mode(struct spdk_poller *poller, void *arg,
* it in the endpoint instead.
*/
ctrlr->endpoint->interrupt_mode = interrupt_mode;
set_ctrlr_intr_mode(ctrlr);
vfio_user_poll_group_rearm(ctrlr_to_poll_group(ctrlr));
}
static int