ionic: refactor use of ionic_rx_fill()

The same pre-work code is used before each call to
ionic_rx_fill(), so bring it in and make it a part of
the routine.
Signed-off-by: NNeel Patel <neel@pensando.io>
Signed-off-by: NShannon Nelson <snelson@pensando.io>
Signed-off-by: NJakub Kicinski <kuba@kernel.org>

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

@@ -348,16 +348,25 @@ void ionic_rx_fill(struct ionic_queue *q)
 	struct ionic_rxq_sg_desc *sg_desc;
 	struct ionic_rxq_sg_elem *sg_elem;
 	struct ionic_buf_info *buf_info;
+	unsigned int fill_threshold;
 	struct ionic_rxq_desc *desc;
 	unsigned int remain_len;
 	unsigned int frag_len;
 	unsigned int nfrags;
+	unsigned int n_fill;
 	unsigned int i, j;
 	unsigned int len;
 
+	n_fill = ionic_q_space_avail(q);
+
+	fill_threshold = min_t(unsigned int, IONIC_RX_FILL_THRESHOLD,
+			       q->num_descs / IONIC_RX_FILL_DIV);
+	if (n_fill < fill_threshold)
+		return;
+
 	len = netdev->mtu + ETH_HLEN + VLAN_HLEN;
 
-	for (i = ionic_q_space_avail(q); i; i--) {
+	for (i = n_fill; i; i--) {
 		nfrags = 0;
 		remain_len = len;
 		desc_info = &q->info[q->head_idx];
@@ -511,7 +520,6 @@ int ionic_rx_napi(struct napi_struct *napi, int budget)
 	struct ionic_cq *cq = napi_to_cq(napi);
 	struct ionic_dev *idev;
 	struct ionic_lif *lif;
-	u16 rx_fill_threshold;
 	u32 work_done = 0;
 	u32 flags = 0;
 
@@ -521,9 +529,6 @@ int ionic_rx_napi(struct napi_struct *napi, int budget)
 	work_done = ionic_cq_service(cq, budget,
 				     ionic_rx_service, NULL, NULL);
 
-	rx_fill_threshold = min_t(u16, IONIC_RX_FILL_THRESHOLD,
-				  cq->num_descs / IONIC_RX_FILL_DIV);
-	if (work_done && ionic_q_space_avail(cq->bound_q) >= rx_fill_threshold)
 	ionic_rx_fill(cq->bound_q);
 
 	if (work_done < budget && napi_complete_done(napi, work_done)) {
@@ -550,7 +555,6 @@ int ionic_txrx_napi(struct napi_struct *napi, int budget)
 	struct ionic_dev *idev;
 	struct ionic_lif *lif;
 	struct ionic_cq *txcq;
-	u16 rx_fill_threshold;
 	u32 rx_work_done = 0;
 	u32 tx_work_done = 0;
 	u32 flags = 0;
@@ -565,9 +569,6 @@ int ionic_txrx_napi(struct napi_struct *napi, int budget)
 	rx_work_done = ionic_cq_service(rxcq, budget,
 					ionic_rx_service, NULL, NULL);
 
-	rx_fill_threshold = min_t(u16, IONIC_RX_FILL_THRESHOLD,
-				  rxcq->num_descs / IONIC_RX_FILL_DIV);
-	if (rx_work_done && ionic_q_space_avail(rxcq->bound_q) >= rx_fill_threshold)
 	ionic_rx_fill(rxcq->bound_q);
 
 	if (rx_work_done < budget && napi_complete_done(napi, rx_work_done)) {