soc/fsl/qbman: Add an argument to signal if NAPI processing is required.

dpaa_eth_napi_schedule() and caam_qi_napi_schedule() schedule NAPI if
invoked from:

 - Hard interrupt context
 - Any context which is not serving soft interrupts

Any context which is not serving soft interrupts includes hard interrupts
so the in_irq() check is redundant. caam_qi_napi_schedule() has a comment
about this:

        /*
         * In case of threaded ISR, for RT kernels in_irq() does not return
         * appropriate value, so use in_serving_softirq to distinguish between
         * softirq and irq contexts.
         */
         if (in_irq() || !in_serving_softirq())

This has nothing to do with RT. Even on a non RT kernel force threaded
interrupts run obviously in thread context and therefore in_irq() returns
false when invoked from the handler.

The extension of the in_irq() check with !in_serving_softirq() was there
when the drivers were added, but in the out of tree FSL BSP the original
condition was in_irq() which got extended due to failures on RT.

The usage of in_xxx() in drivers is phased out and Linus clearly requested
that code which changes behaviour depending on context should either be
separated or the context be conveyed in an argument passed by the caller,
which usually knows the context. Right he is, the above construct is
clearly showing why.

The following callchains have been analyzed to end up in
dpaa_eth_napi_schedule():

qman_p_poll_dqrr()
  __poll_portal_fast()
    fq->cb.dqrr()
       dpaa_eth_napi_schedule()

portal_isr()
  __poll_portal_fast()
    fq->cb.dqrr()
       dpaa_eth_napi_schedule()

Both need to schedule NAPI.
The crypto part has another code path leading up to this:
  kill_fq()
     empty_retired_fq()
       qman_p_poll_dqrr()
         __poll_portal_fast()
            fq->cb.dqrr()
               dpaa_eth_napi_schedule()

kill_fq() is called from task context and ends up scheduling NAPI, but
that's pointless and an unintended side effect of the !in_serving_softirq()
check.

The code path:
  caam_qi_poll() -> qman_p_poll_dqrr()

is invoked from NAPI and I *assume* from crypto's NAPI device and not
from qbman's NAPI device. I *guess* it is okay to skip scheduling NAPI
(because this is what happens now) but could be changed if it is wrong
due to `budget' handling.

Add an argument to __poll_portal_fast() which is true if NAPI needs to be
scheduled. This requires propagating the value to the caller including
`qman_cb_dqrr' typedef which is used by the dpaa and the crypto driver.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Aymen Sghaier <aymen.sghaier@nxp.com>
Cc: Herbert XS <herbert@gondor.apana.org.au>
Cc: Li Yang <leoyang.li@nxp.com>
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Madalin Bucur <madalin.bucur@oss.nxp.com>
Tested-by: Camelia Groza <camelia.groza@nxp.com>

3 files changed, 14 insertions, 10 deletions

diff --git a/drivers/soc/fsl/qbman/qman.c b/drivers/soc/fsl/qbman/qman.c
index 9888a7061873..101def7dc73d 100644
--- a/drivers/soc/fsl/qbman/qman.c
+++ b/drivers/soc/fsl/qbman/qman.c
@@ -1159,7 +1159,7 @@ static u32 fq_to_tag(struct qman_fq *fq)
 
 static u32 __poll_portal_slow(struct qman_portal *p, u32 is);
 static inline unsigned int __poll_portal_fast(struct qman_portal *p,
-					unsigned int poll_limit);
+					unsigned int poll_limit, bool sched_napi);
 static void qm_congestion_task(struct work_struct *work);
 static void qm_mr_process_task(struct work_struct *work);
 
@@ -1174,7 +1174,7 @@ static irqreturn_t portal_isr(int irq, void *ptr)
 
 	/* DQRR-handling if it's interrupt-driven */
 	if (is & QM_PIRQ_DQRI) {
-		__poll_portal_fast(p, QMAN_POLL_LIMIT);
+		__poll_portal_fast(p, QMAN_POLL_LIMIT, true);
 		clear = QM_DQAVAIL_MASK | QM_PIRQ_DQRI;
 	}
 	/* Handling of anything else that's interrupt-driven */
@@ -1602,7 +1602,7 @@ static noinline void clear_vdqcr(struct qman_portal *p, struct qman_fq *fq)
  * user callbacks to call into any QMan API.
  */
 static inline unsigned int __poll_portal_fast(struct qman_portal *p,
-					unsigned int poll_limit)
+					unsigned int poll_limit, bool sched_napi)
 {
 	const struct qm_dqrr_entry *dq;
 	struct qman_fq *fq;
@@ -1636,7 +1636,7 @@ static inline unsigned int __poll_portal_fast(struct qman_portal *p,
 			 * and we don't want multiple if()s in the critical
 			 * path (SDQCR).
 			 */
-			res = fq->cb.dqrr(p, fq, dq);
+			res = fq->cb.dqrr(p, fq, dq, sched_napi);
 			if (res == qman_cb_dqrr_stop)
 				break;
 			/* Check for VDQCR completion */
@@ -1646,7 +1646,7 @@ static inline unsigned int __poll_portal_fast(struct qman_portal *p,
 			/* SDQCR: context_b points to the FQ */
 			fq = tag_to_fq(be32_to_cpu(dq->context_b));
 			/* Now let the callback do its stuff */
-			res = fq->cb.dqrr(p, fq, dq);
+			res = fq->cb.dqrr(p, fq, dq, sched_napi);
 			/*
 			 * The callback can request that we exit without
 			 * consuming this entry nor advancing;
@@ -1753,7 +1753,7 @@ EXPORT_SYMBOL(qman_start_using_portal);
 
 int qman_p_poll_dqrr(struct qman_portal *p, unsigned int limit)
 {
-	return __poll_portal_fast(p, limit);
+	return __poll_portal_fast(p, limit, false);
 }
 EXPORT_SYMBOL(qman_p_poll_dqrr);
 
diff --git a/drivers/soc/fsl/qbman/qman_test_api.c b/drivers/soc/fsl/qbman/qman_test_api.c
index 7066b2f1467c..28fbddc3c204 100644
--- a/drivers/soc/fsl/qbman/qman_test_api.c
+++ b/drivers/soc/fsl/qbman/qman_test_api.c
@@ -45,7 +45,8 @@
 
 static enum qman_cb_dqrr_result cb_dqrr(struct qman_portal *,
 					struct qman_fq *,
-					const struct qm_dqrr_entry *);
+					const struct qm_dqrr_entry *,
+					bool sched_napi);
 static void cb_ern(struct qman_portal *, struct qman_fq *,
 		   const union qm_mr_entry *);
 static void cb_fqs(struct qman_portal *, struct qman_fq *,
@@ -208,7 +209,8 @@ failed:
 
 static enum qman_cb_dqrr_result cb_dqrr(struct qman_portal *p,
 					struct qman_fq *fq,
-					const struct qm_dqrr_entry *dq)
+					const struct qm_dqrr_entry *dq,
+					bool sched_napi)
 {
 	if (WARN_ON(fd_neq(&fd_dq, &dq->fd))) {
 		pr_err("BADNESS: dequeued frame doesn't match;\n");
diff --git a/drivers/soc/fsl/qbman/qman_test_stash.c b/drivers/soc/fsl/qbman/qman_test_stash.c
index e87b65403b67..b7e8e5ec884c 100644
--- a/drivers/soc/fsl/qbman/qman_test_stash.c
+++ b/drivers/soc/fsl/qbman/qman_test_stash.c
@@ -275,7 +275,8 @@ static inline int process_frame_data(struct hp_handler *handler,
 
 static enum qman_cb_dqrr_result normal_dqrr(struct qman_portal *portal,
 					    struct qman_fq *fq,
-					    const struct qm_dqrr_entry *dqrr)
+					    const struct qm_dqrr_entry *dqrr,
+					    bool sched_napi)
 {
 	struct hp_handler *handler = (struct hp_handler *)fq;
 
@@ -293,7 +294,8 @@ skip:
 
 static enum qman_cb_dqrr_result special_dqrr(struct qman_portal *portal,
 					     struct qman_fq *fq,
-					     const struct qm_dqrr_entry *dqrr)
+					     const struct qm_dqrr_entry *dqrr,
+					     bool sched_napi)
 {
 	struct hp_handler *handler = (struct hp_handler *)fq;