Patch "ionic: Fix dim work handling in split interrupt mode" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    ionic: Fix dim work handling in split interrupt mode

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     ionic-fix-dim-work-handling-in-split-interrupt-mode.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit e956c5f160cc5799903f2332c8482451a46a3a90
Author: Brett Creeley <brett.creeley@xxxxxxx>
Date:   Mon Dec 4 11:22:34 2023 -0800

    ionic: Fix dim work handling in split interrupt mode
    
    [ Upstream commit 4115ba677c35f694b62298e55f0e04ce84eed469 ]
    
    Currently ionic_dim_work() is incorrect when in
    split interrupt mode. This is because the interrupt
    rate is only being changed for the Rx side even for
    dim running on Tx. Fix this by using the qcq from
    the container_of macro. Also, introduce some local
    variables for a bit of cleanup.
    
    Fixes: a6ff85e0a2d9 ("ionic: remove intr coalesce update from napi")
    Signed-off-by: Brett Creeley <brett.creeley@xxxxxxx>
    Signed-off-by: Shannon Nelson <shannon.nelson@xxxxxxx>
    Reviewed-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
    Link: https://lore.kernel.org/r/20231204192234.21017-3-shannon.nelson@xxxxxxx
    Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index 2cc126d378353..63181866809fd 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -44,24 +44,24 @@ static void ionic_lif_queue_identify(struct ionic_lif *lif);
 static void ionic_dim_work(struct work_struct *work)
 {
 	struct dim *dim = container_of(work, struct dim, work);
+	struct ionic_intr_info *intr;
 	struct dim_cq_moder cur_moder;
 	struct ionic_qcq *qcq;
+	struct ionic_lif *lif;
 	u32 new_coal;
 
 	cur_moder = net_dim_get_rx_moderation(dim->mode, dim->profile_ix);
 	qcq = container_of(dim, struct ionic_qcq, dim);
-	new_coal = ionic_coal_usec_to_hw(qcq->q.lif->ionic, cur_moder.usec);
+	lif = qcq->q.lif;
+	new_coal = ionic_coal_usec_to_hw(lif->ionic, cur_moder.usec);
 	new_coal = new_coal ? new_coal : 1;
 
-	if (qcq->intr.dim_coal_hw != new_coal) {
-		unsigned int qi = qcq->cq.bound_q->index;
-		struct ionic_lif *lif = qcq->q.lif;
-
-		qcq->intr.dim_coal_hw = new_coal;
+	intr = &qcq->intr;
+	if (intr->dim_coal_hw != new_coal) {
+		intr->dim_coal_hw = new_coal;
 
 		ionic_intr_coal_init(lif->ionic->idev.intr_ctrl,
-				     lif->rxqcqs[qi]->intr.index,
-				     qcq->intr.dim_coal_hw);
+				     intr->index, intr->dim_coal_hw);
 	}
 
 	dim->state = DIM_START_MEASURE;