netdev - [PATCH net-next 3/4] net/smc: Pass on DMBE bit mask in IRQ handler

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Date:   Mon, 25 Jul 2022 16:09:59 +0200
From:   Wenjia Zhang <wenjia@...ux.ibm.com>
To:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, linux-s390@...r.kernel.org,
        Heiko Carstens <hca@...ux.ibm.com>,
        Karsten Graul <kgraul@...ux.ibm.com>,
        Alexandra Winter <wintera@...ux.ibm.com>,
        Stefan Raspl <raspl@...ux.ibm.com>,
        Wenjia Zhang <wenjia@...ux.ibm.com>
Subject: [PATCH net-next 3/4] net/smc: Pass on DMBE bit mask in IRQ handler

From: Stefan Raspl <raspl@...ux.ibm.com>

Make the DMBE bits, which are passed on individually in ism_move() as
parameter idx, available to the receiver.

Signed-off-by: Stefan Raspl <raspl@...ux.ibm.com>
Signed-off-by: Wenjia Zhang < wenjia@...ux.ibm.com>
---
 drivers/s390/net/ism_drv.c | 4 +++-
 include/net/smc.h          | 2 +-
 net/smc/smc_ism.c          | 6 +++---
 3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/s390/net/ism_drv.c b/drivers/s390/net/ism_drv.c
index 4665e9a0e048..d34bb6ec1490 100644
--- a/drivers/s390/net/ism_drv.c
+++ b/drivers/s390/net/ism_drv.c
@@ -443,6 +443,7 @@ static irqreturn_t ism_handle_irq(int irq, void *data)
 	struct ism_dev *ism = data;
 	unsigned long bit, end;
 	unsigned long *bv;
+	u16 dmbemask;
 
 	bv = (void *) &ism->sba->dmb_bits[ISM_DMB_WORD_OFFSET];
 	end = sizeof(ism->sba->dmb_bits) * BITS_PER_BYTE - ISM_DMB_BIT_OFFSET;
@@ -456,9 +457,10 @@ static irqreturn_t ism_handle_irq(int irq, void *data)
 			break;
 
 		clear_bit_inv(bit, bv);
+		dmbemask = ism->sba->dmbe_mask[bit + ISM_DMB_BIT_OFFSET];
 		ism->sba->dmbe_mask[bit + ISM_DMB_BIT_OFFSET] = 0;
 		barrier();
-		smcd_handle_irq(ism->smcd, bit + ISM_DMB_BIT_OFFSET);
+		smcd_handle_irq(ism->smcd, bit + ISM_DMB_BIT_OFFSET, dmbemask);
 	}
 
 	if (ism->sba->e) {
diff --git a/include/net/smc.h b/include/net/smc.h
index 1868a5014dea..c926d3313e05 100644
--- a/include/net/smc.h
+++ b/include/net/smc.h
@@ -101,5 +101,5 @@ int smcd_register_dev(struct smcd_dev *smcd);
 void smcd_unregister_dev(struct smcd_dev *smcd);
 void smcd_free_dev(struct smcd_dev *smcd);
 void smcd_handle_event(struct smcd_dev *dev, struct smcd_event *event);
-void smcd_handle_irq(struct smcd_dev *dev, unsigned int bit);
+void smcd_handle_irq(struct smcd_dev *dev, unsigned int bit, u16 dmbemask);
 #endif	/* _SMC_H */
diff --git a/net/smc/smc_ism.c b/net/smc/smc_ism.c
index e51c0cdff8e0..911fe08bc54b 100644
--- a/net/smc/smc_ism.c
+++ b/net/smc/smc_ism.c
@@ -508,13 +508,13 @@ void smcd_handle_event(struct smcd_dev *smcd, struct smcd_event *event)
 EXPORT_SYMBOL_GPL(smcd_handle_event);
 
 /* SMCD Device interrupt handler. Called from ISM device interrupt handler.
- * Parameters are smcd device pointer and DMB number. Find the connection and
- * schedule the tasklet for this connection.
+ * Parameters are smcd device pointer, DMB number, and the DMBE bitmask.
+ * Find the connection and schedule the tasklet for this connection.
  *
  * Context:
  * - Function called in IRQ context from ISM device driver IRQ handler.
  */
-void smcd_handle_irq(struct smcd_dev *smcd, unsigned int dmbno)
+void smcd_handle_irq(struct smcd_dev *smcd, unsigned int dmbno, u16 dmbemask)
 {
 	struct smc_connection *conn = NULL;
 	unsigned long flags;
-- 
2.35.2