Re: [PATCH v2 07/13] scsi: fnic: Modify ISRs to support multiqueue(MQ)
From: Hannes Reinecke
Date: Thu Nov 02 2023 - 03:46:09 EST
On 10/27/23 20:02, Karan Tilak Kumar wrote:
Modify interrupt service routines for INTx, MSI, and MSI-x
to support multiqueue.
Modify parameter list of fnic_wq_copy_cmpl_handler
to take cq_index.
Modify fnic_cleanup function to use the new
function call of fnic_wq_copy_cmpl_handler.
Refactor code to set
interrupt mode to MSI-x to a new function.
Add a new stat for intx_dummy.
Changes between v1 and v2:
Suppress warning from kernel test bot.
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202310251847.4T8BVZAZ-lkp@xxxxxxxxx/
Reviewed-by: Sesidhar Baddela <sebaddel@xxxxxxxxx>
Reviewed-by: Arulprabhu Ponnusamy <arulponn@xxxxxxxxx>
Signed-off-by: Karan Tilak Kumar <kartilak@xxxxxxxxx>
---
drivers/scsi/fnic/fnic.h | 3 +-
drivers/scsi/fnic/fnic_isr.c | 164 ++++++++++++++++++++++++---------
drivers/scsi/fnic/fnic_main.c | 4 +-
drivers/scsi/fnic/fnic_scsi.c | 38 +++-----
drivers/scsi/fnic/fnic_stats.h | 1 +
5 files changed, 140 insertions(+), 70 deletions(-)
diff --git a/drivers/scsi/fnic/fnic.h b/drivers/scsi/fnic/fnic.h
index f4390fc96323..9e104468b0d4 100644
--- a/drivers/scsi/fnic/fnic.h
+++ b/drivers/scsi/fnic/fnic.h
@@ -343,6 +343,7 @@ extern const struct attribute_group *fnic_host_groups[];
void fnic_clear_intr_mode(struct fnic *fnic);
int fnic_set_intr_mode(struct fnic *fnic);
+int fnic_set_intr_mode_msix(struct fnic *fnic);
void fnic_free_intr(struct fnic *fnic);
int fnic_request_intr(struct fnic *fnic);
@@ -369,7 +370,7 @@ void fnic_scsi_cleanup(struct fc_lport *);
void fnic_scsi_abort_io(struct fc_lport *);
void fnic_empty_scsi_cleanup(struct fc_lport *);
void fnic_exch_mgr_reset(struct fc_lport *, u32, u32);
-int fnic_wq_copy_cmpl_handler(struct fnic *fnic, int);
+int fnic_wq_copy_cmpl_handler(struct fnic *fnic, int copy_work_to_do, unsigned int cq_index);
int fnic_wq_cmpl_handler(struct fnic *fnic, int);
int fnic_flogi_reg_handler(struct fnic *fnic, u32);
void fnic_wq_copy_cleanup_handler(struct vnic_wq_copy *wq,
diff --git a/drivers/scsi/fnic/fnic_isr.c b/drivers/scsi/fnic/fnic_isr.c
index dff9689023e4..82e4e3e8ec4b 100644
--- a/drivers/scsi/fnic/fnic_isr.c
+++ b/drivers/scsi/fnic/fnic_isr.c
@@ -38,8 +38,13 @@ static irqreturn_t fnic_isr_legacy(int irq, void *data)
fnic_log_q_error(fnic);
}
+ if (pba & (1 << FNIC_INTX_DUMMY)) {
+ atomic64_inc(&fnic->fnic_stats.misc_stats.intx_dummy);
+ vnic_intr_return_all_credits(&fnic->intr[FNIC_INTX_DUMMY]);
+ }
+
if (pba & (1 << FNIC_INTX_WQ_RQ_COPYWQ)) {
- work_done += fnic_wq_copy_cmpl_handler(fnic, io_completions);
+ work_done += fnic_wq_copy_cmpl_handler(fnic, io_completions, FNIC_MQ_CQ_INDEX);
work_done += fnic_wq_cmpl_handler(fnic, -1);
work_done += fnic_rq_cmpl_handler(fnic, -1);
@@ -60,7 +65,7 @@ static irqreturn_t fnic_isr_msi(int irq, void *data)
fnic->fnic_stats.misc_stats.last_isr_time = jiffies;
atomic64_inc(&fnic->fnic_stats.misc_stats.isr_count);
- work_done += fnic_wq_copy_cmpl_handler(fnic, io_completions);
+ work_done += fnic_wq_copy_cmpl_handler(fnic, io_completions, FNIC_MQ_CQ_INDEX);
work_done += fnic_wq_cmpl_handler(fnic, -1);
work_done += fnic_rq_cmpl_handler(fnic, -1);
@@ -109,12 +114,22 @@ static irqreturn_t fnic_isr_msix_wq_copy(int irq, void *data)
{
struct fnic *fnic = data;
unsigned long wq_copy_work_done = 0;
+ int i;
fnic->fnic_stats.misc_stats.last_isr_time = jiffies;
atomic64_inc(&fnic->fnic_stats.misc_stats.isr_count);
- wq_copy_work_done = fnic_wq_copy_cmpl_handler(fnic, io_completions);
- vnic_intr_return_credits(&fnic->intr[FNIC_MSIX_WQ_COPY],
+ i = irq - fnic->msix[0].irq_num;
+ if (i >= fnic->wq_copy_count + fnic->cpy_wq_base ||
+ i < 0 || fnic->msix[i].irq_num != irq) {
+ for (i = fnic->cpy_wq_base; i < fnic->wq_copy_count + fnic->cpy_wq_base ; i++) {
+ if (fnic->msix[i].irq_num == irq)
+ break;
+ }
+ }
+
+ wq_copy_work_done = fnic_wq_copy_cmpl_handler(fnic, io_completions, i);
+ vnic_intr_return_credits(&fnic->intr[i],
wq_copy_work_done,
1 /* unmask intr */,
1 /* reset intr timer */);
@@ -128,7 +143,7 @@ static irqreturn_t fnic_isr_msix_err_notify(int irq, void *data)
fnic->fnic_stats.misc_stats.last_isr_time = jiffies;
atomic64_inc(&fnic->fnic_stats.misc_stats.isr_count);
- vnic_intr_return_all_credits(&fnic->intr[FNIC_MSIX_ERR_NOTIFY]);
+ vnic_intr_return_all_credits(&fnic->intr[fnic->err_intr_offset]);
fnic_log_q_error(fnic);
fnic_handle_link_event(fnic);
@@ -186,26 +201,30 @@ int fnic_request_intr(struct fnic *fnic)
fnic->msix[FNIC_MSIX_WQ].isr = fnic_isr_msix_wq;
fnic->msix[FNIC_MSIX_WQ].devid = fnic;
- sprintf(fnic->msix[FNIC_MSIX_WQ_COPY].devname,
- "%.11s-scsi-wq", fnic->name);
- fnic->msix[FNIC_MSIX_WQ_COPY].isr = fnic_isr_msix_wq_copy;
- fnic->msix[FNIC_MSIX_WQ_COPY].devid = fnic;
+ for (i = fnic->cpy_wq_base; i < fnic->wq_copy_count + fnic->cpy_wq_base; i++) {
+ sprintf(fnic->msix[i].devname,
+ "%.11s-scsi-wq-%d", fnic->name, i-FNIC_MSIX_WQ_COPY);
+ fnic->msix[i].isr = fnic_isr_msix_wq_copy;
+ fnic->msix[i].devid = fnic;
+ }
- sprintf(fnic->msix[FNIC_MSIX_ERR_NOTIFY].devname,
+ sprintf(fnic->msix[fnic->err_intr_offset].devname,
"%.11s-err-notify", fnic->name);
- fnic->msix[FNIC_MSIX_ERR_NOTIFY].isr =
+ fnic->msix[fnic->err_intr_offset].isr =
fnic_isr_msix_err_notify;
- fnic->msix[FNIC_MSIX_ERR_NOTIFY].devid = fnic;
+ fnic->msix[fnic->err_intr_offset].devid = fnic;
+
+ for (i = 0; i < fnic->intr_count; i++) {
+ fnic->msix[i].irq_num = pci_irq_vector(fnic->pdev, i);
- for (i = 0; i < ARRAY_SIZE(fnic->msix); i++) {
- err = request_irq(pci_irq_vector(fnic->pdev, i),
- fnic->msix[i].isr, 0,
- fnic->msix[i].devname,
- fnic->msix[i].devid);
+ err = request_irq(fnic->msix[i].irq_num,
+ fnic->msix[i].isr, 0,
+ fnic->msix[i].devname,
+ fnic->msix[i].devid);
if (err) {
- shost_printk(KERN_ERR, fnic->lport->host,
- "MSIX: request_irq"
- " failed %d\n", err);
+ FNIC_ISR_DBG(KERN_ERR, fnic->lport->host,
+ "fnic<%d>: %s: %d request_irq failed with error: %d\n",
+ fnic->fnic_num, __func__, __LINE__, err);
fnic_free_intr(fnic);
break;
}
@@ -220,44 +239,101 @@ int fnic_request_intr(struct fnic *fnic)
return err;
}
-int fnic_set_intr_mode(struct fnic *fnic)
+int fnic_set_intr_mode_msix(struct fnic *fnic)
{
unsigned int n = ARRAY_SIZE(fnic->rq);
unsigned int m = ARRAY_SIZE(fnic->wq);
unsigned int o = ARRAY_SIZE(fnic->hw_copy_wq);
+ unsigned int min_irqs = n + m + 1 + 1; /*rq, raw wq, wq, err*/
/*
- * Set interrupt mode (INTx, MSI, MSI-X) depending
- * system capabilities.
- *
- * Try MSI-X first
- *
* We need n RQs, m WQs, o Copy WQs, n+m+o CQs, and n+m+o+1 INTRs
* (last INTR is used for WQ/RQ errors and notification area)
*/
- if (fnic->rq_count >= n &&
- fnic->raw_wq_count >= m &&
- fnic->wq_copy_count >= o &&
- fnic->cq_count >= n + m + o) {
- int vecs = n + m + o + 1;
-
- if (pci_alloc_irq_vectors(fnic->pdev, vecs, vecs,
- PCI_IRQ_MSIX) == vecs) {
+ FNIC_ISR_DBG(KERN_INFO, fnic->lport->host,
+ "fnic<%d>: %s: %d: rq-array size: %d wq-array size: %d copy-wq array size: %d\n",
+ fnic->fnic_num, __func__, __LINE__, n, m, o);
+ FNIC_ISR_DBG(KERN_INFO, fnic->lport->host,
+ "fnic<%d>: %s: %d: rq_count: %d raw_wq_count: %d wq_copy_count: %d cq_count: %d\n",
+ fnic->fnic_num, __func__, __LINE__, fnic->rq_count, fnic->raw_wq_count,
+ fnic->wq_copy_count, fnic->cq_count);
+
+ if (fnic->rq_count <= n && fnic->raw_wq_count <= m &&
+ fnic->wq_copy_count <= o) {
+ int vec_count = 0;
+ int vecs = fnic->rq_count + fnic->raw_wq_count + fnic->wq_copy_count + 1;
+
+ vec_count = pci_alloc_irq_vectors(fnic->pdev, min_irqs, vecs,
+ PCI_IRQ_MSIX | PCI_IRQ_AFFINITY);
+ FNIC_ISR_DBG(KERN_INFO, fnic->lport->host,
+ "fnic<%d>: %s: %d: allocated %d MSI-X vectors\n",
+ fnic->fnic_num, __func__, __LINE__, vec_count);
+
+ if (vec_count > 0) {
+ if (vec_count < vecs) {
+ FNIC_ISR_DBG(KERN_ERR, fnic->lport->host,
+ "fnic<%d>: %s: %d: interrupts number mismatch: vec_count: %d vecs: %d\n",
+ fnic->fnic_num, __func__, __LINE__, vec_count, vecs);
+ if (vec_count < min_irqs) {
+ FNIC_ISR_DBG(KERN_ERR, fnic->lport->host,
+ "fnic<%d>: %s: %d: no interrupts for copy wq\n",
+ fnic->fnic_num, __func__, __LINE__);
+ return 1;
+ }
+ }
+
fnic->rq_count = n;
fnic->raw_wq_count = m;
- fnic->wq_copy_count = o;
- fnic->wq_count = m + o;
- fnic->cq_count = n + m + o;
- fnic->intr_count = vecs;
- fnic->err_intr_offset = FNIC_MSIX_ERR_NOTIFY;
-
- FNIC_ISR_DBG(KERN_DEBUG, fnic->lport->host,
- "Using MSI-X Interrupts\n");
- vnic_dev_set_intr_mode(fnic->vdev,
- VNIC_DEV_INTR_MODE_MSIX);
+ fnic->cpy_wq_base = fnic->rq_count + fnic->raw_wq_count;
+ fnic->wq_copy_count = vec_count - n - m - 1;
+ fnic->wq_count = fnic->raw_wq_count + fnic->wq_copy_count;
+ if (fnic->cq_count != vec_count - 1) {
+ FNIC_ISR_DBG(KERN_ERR, fnic->lport->host,
+ "fnic<%d>: %s: %d: CQ count: %d does not match MSI-X vector count: %d\n",
+ fnic->fnic_num, __func__, __LINE__, fnic->cq_count, vec_count);
+ fnic->cq_count = vec_count - 1;
+ }
+ fnic->intr_count = vec_count;
+ fnic->err_intr_offset = fnic->rq_count + fnic->wq_count;
+
+ FNIC_ISR_DBG(KERN_INFO, fnic->lport->host,
+ "fnic<%d>: %s: %d: rq_count: %d raw_wq_count: %d cpy_wq_base: %d\n",
+ fnic->fnic_num, __func__, __LINE__, fnic->rq_count,
+ fnic->raw_wq_count, fnic->cpy_wq_base);
+
+ FNIC_ISR_DBG(KERN_INFO, fnic->lport->host,
+ "fnic<%d>: %s: %d: wq_copy_count: %d wq_count: %d cq_count: %d\n",
+ fnic->fnic_num, __func__, __LINE__, fnic->wq_copy_count,
+ fnic->wq_count, fnic->cq_count);
+
+ FNIC_ISR_DBG(KERN_INFO, fnic->lport->host,
+ "fnic<%d>: %s: %d: intr_count: %d err_intr_offset: %u",
+ fnic->fnic_num, __func__, __LINE__, fnic->intr_count,
+ fnic->err_intr_offset);
+
+ vnic_dev_set_intr_mode(fnic->vdev, VNIC_DEV_INTR_MODE_MSIX);
+ FNIC_ISR_DBG(KERN_INFO, fnic->lport->host,
+ "fnic<%d>: %s: %d: fnic using MSI-X\n", fnic->fnic_num,
+ __func__, __LINE__);
return 0;
}
}
+ return 1;
+} //fnic_set_intr_mode_msix
Please avoid C99 style comments.
[ .. ]
Otherwise:
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>
Cheers,
Hannes
--
Dr. Hannes Reinecke Kernel Storage Architect
hare@xxxxxxx +49 911 74053 688
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