ionic: carry idev in ionic_cq struct

Remove the idev field from ionic_queue, which saves us a
bit of space, and add it into ionic_cq where there's room
within some cacheline padding.  Use this pointer rather
than doing a multi level reference from lif->ionic.
Suggested-by: Neel Patel <npatel2@amd.com>
Reviewed-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/pensando/ionic/ionic_dev.c

@@ -629,6 +629,7 @@ int ionic_cq_init(struct ionic_lif *lif, struct ionic_cq *cq,
 	cq->desc_size = desc_size;
 	cq->tail_idx = 0;
 	cq->done_color = 1;
+	cq->idev = &lif->ionic->idev;
 
 	return 0;
 }
@@ -673,7 +674,6 @@ int ionic_q_init(struct ionic_lif *lif, struct ionic_dev *idev,
 		return -EINVAL;
 
 	q->lif = lif;
-	q->idev = idev;
 	q->index = index;
 	q->num_descs = num_descs;
 	q->desc_size = desc_size;

drivers/net/ethernet/pensando/ionic/ionic_dev.h

@@ -240,7 +240,6 @@ struct ionic_queue {
 	unsigned int max_sg_elems;
 	u64 features;
 	u64 drop;
-	struct ionic_dev *idev;
 	unsigned int type;
 	unsigned int hw_index;
 	unsigned int hw_type;
@@ -296,6 +295,7 @@ struct ionic_cq {
 	unsigned int desc_size;
 	void *base;
 	dma_addr_t base_pa;
+	struct ionic_dev *idev;
 } ____cacheline_aligned_in_smp;
 
 struct ionic;

drivers/net/ethernet/pensando/ionic/ionic_txrx.c

@@ -948,14 +948,9 @@ int ionic_tx_napi(struct napi_struct *napi, int budget)
 {
 	struct ionic_qcq *qcq = napi_to_qcq(napi);
 	struct ionic_cq *cq = napi_to_cq(napi);
-	struct ionic_dev *idev;
-	struct ionic_lif *lif;
 	u32 work_done = 0;
 	u32 flags = 0;
 
-	lif = cq->bound_q->lif;
-	idev = &lif->ionic->idev;
-
 	work_done = ionic_tx_cq_service(cq, budget);
 
 	if (unlikely(!budget))
@@ -969,7 +964,7 @@ int ionic_tx_napi(struct napi_struct *napi, int budget)
 
 	if (work_done || flags) {
 		flags |= IONIC_INTR_CRED_RESET_COALESCE;
-		ionic_intr_credits(idev->intr_ctrl,
+		ionic_intr_credits(cq->idev->intr_ctrl,
 				   cq->bound_intr->index,
 				   work_done, flags);
 	}
@@ -992,17 +987,12 @@ int ionic_rx_napi(struct napi_struct *napi, int budget)
 {
 	struct ionic_qcq *qcq = napi_to_qcq(napi);
 	struct ionic_cq *cq = napi_to_cq(napi);
-	struct ionic_dev *idev;
-	struct ionic_lif *lif;
 	u32 work_done = 0;
 	u32 flags = 0;
 
 	if (unlikely(!budget))
 		return budget;
 
-	lif = cq->bound_q->lif;
-	idev = &lif->ionic->idev;
-
 	work_done = ionic_cq_service(cq, budget,
 				     ionic_rx_service, NULL, NULL);
 
@@ -1017,7 +1007,7 @@ int ionic_rx_napi(struct napi_struct *napi, int budget)
 
 	if (work_done || flags) {
 		flags |= IONIC_INTR_CRED_RESET_COALESCE;
-		ionic_intr_credits(idev->intr_ctrl,
+		ionic_intr_credits(cq->idev->intr_ctrl,
 				   cq->bound_intr->index,
 				   work_done, flags);
 	}
@@ -1034,7 +1024,6 @@ int ionic_txrx_napi(struct napi_struct *napi, int budget)
 	struct ionic_cq *rxcq = napi_to_cq(napi);
 	unsigned int qi = rxcq->bound_q->index;
 	struct ionic_qcq *txqcq;
-	struct ionic_dev *idev;
 	struct ionic_lif *lif;
 	struct ionic_cq *txcq;
 	bool resched = false;
@@ -1043,7 +1032,6 @@ int ionic_txrx_napi(struct napi_struct *napi, int budget)
 	u32 flags = 0;
 
 	lif = rxcq->bound_q->lif;
-	idev = &lif->ionic->idev;
 	txqcq = lif->txqcqs[qi];
 	txcq = &lif->txqcqs[qi]->cq;
 
@@ -1066,7 +1054,7 @@ int ionic_txrx_napi(struct napi_struct *napi, int budget)
 
 	if (rx_work_done || flags) {
 		flags |= IONIC_INTR_CRED_RESET_COALESCE;
-		ionic_intr_credits(idev->intr_ctrl, rxcq->bound_intr->index,
+		ionic_intr_credits(rxcq->idev->intr_ctrl, rxcq->bound_intr->index,
 				   tx_work_done + rx_work_done, flags);
 	}
 
@@ -1310,12 +1298,11 @@ unsigned int ionic_tx_cq_service(struct ionic_cq *cq, unsigned int work_to_do)
 
 void ionic_tx_flush(struct ionic_cq *cq)
 {
-	struct ionic_dev *idev = &cq->lif->ionic->idev;
 	u32 work_done;
 
 	work_done = ionic_tx_cq_service(cq, cq->num_descs);
 	if (work_done)
-		ionic_intr_credits(idev->intr_ctrl, cq->bound_intr->index,
+		ionic_intr_credits(cq->idev->intr_ctrl, cq->bound_intr->index,
 				   work_done, IONIC_INTR_CRED_RESET_COALESCE);
 }