qlcnic: Use shared interrupt vector for Tx and Rx

o VF will use shared MSI-X interrupt vector for Tx and Rx.
o When QLCNIC_INTR_SHARED flag is set Tx and Rx will
  share MSI-X interrupt vector. Tx will use a separate
  MSI-X interrupt vector from Rx otherwise.
Signed-off-by: Rajesh Borundia <rajesh.borundia@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qlcnic/qlcnic.h

@@ -897,6 +897,7 @@ struct qlcnic_ipaddr {
 #define QLCNIC_FW_RESET_OWNER		0x2000
 #define QLCNIC_FW_HANG			0x4000
 #define QLCNIC_FW_LRO_MSS_CAP		0x8000
+#define QLCNIC_TX_INTR_SHARED		0x10000
 #define QLCNIC_IS_MSI_FAMILY(adapter) \
 	((adapter)->flags & (QLCNIC_MSI_ENABLED | QLCNIC_MSIX_ENABLED))
 

drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c

@@ -410,7 +410,10 @@ int qlcnic_83xx_setup_intr(struct qlcnic_adapter *adapter, u8 num_intr)
 					      num_intr));
 	/* account for AEN interrupt MSI-X based interrupts */
 	num_msix += 1;
-	num_msix += adapter->max_drv_tx_rings;
+
+	if (!(adapter->flags & QLCNIC_TX_INTR_SHARED))
+		num_msix += adapter->max_drv_tx_rings;
+
 	err = qlcnic_enable_msix(adapter, num_msix);
 	if (err == -ENOMEM)
 		return err;
@@ -1243,6 +1246,7 @@ int qlcnic_83xx_create_tx_ctx(struct qlcnic_adapter *adapter,
 	struct qlcnic_tx_mbx mbx;
 	struct qlcnic_tx_mbx_out *mbx_out;
 	struct qlcnic_hardware_context *ahw = adapter->ahw;
+	u32 msix_vector;
 
 	/* Reset host resources */
 	tx->producer = 0;
@@ -1257,10 +1261,16 @@ int qlcnic_83xx_create_tx_ctx(struct qlcnic_adapter *adapter,
 	mbx.cnsmr_index_low = LSD(tx->hw_cons_phys_addr);
 	mbx.cnsmr_index_high = MSD(tx->hw_cons_phys_addr);
 	mbx.size = tx->num_desc;
-	if (adapter->flags & QLCNIC_MSIX_ENABLED)
-		msix_id = ahw->intr_tbl[adapter->max_sds_rings + ring].id;
-	else
+	if (adapter->flags & QLCNIC_MSIX_ENABLED) {
+		if (!(adapter->flags & QLCNIC_TX_INTR_SHARED))
+			msix_vector = adapter->max_sds_rings + ring;
+		else
+			msix_vector = adapter->max_sds_rings - 1;
+		msix_id = ahw->intr_tbl[msix_vector].id;
+	} else {
 		msix_id = QLCRDX(ahw, QLCNIC_DEF_INT_ID);
+	}
+
 	if (adapter->ahw->diag_test != QLCNIC_LOOPBACK_TEST)
 		mbx.intr_id = msix_id;
 	else
@@ -1282,7 +1292,8 @@ int qlcnic_83xx_create_tx_ctx(struct qlcnic_adapter *adapter,
 	mbx_out = (struct qlcnic_tx_mbx_out *)&cmd.rsp.arg[2];
 	tx->crb_cmd_producer = ahw->pci_base0 + mbx_out->host_prod;
 	tx->ctx_id = mbx_out->ctx_id;
-	if (adapter->flags & QLCNIC_MSIX_ENABLED) {
+	if ((adapter->flags & QLCNIC_MSIX_ENABLED) &&
+	    !(adapter->flags & QLCNIC_TX_INTR_SHARED)) {
 		intr_mask = ahw->intr_tbl[adapter->max_sds_rings + ring].src;
 		tx->crb_intr_mask = ahw->pci_base0 + intr_mask;
 	}

drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c

@@ -1691,6 +1691,29 @@ static int qlcnic_83xx_process_rcv_ring(struct qlcnic_host_sds_ring *sds_ring,
 	return count;
 }
 
+static int qlcnic_83xx_msix_sriov_vf_poll(struct napi_struct *napi, int budget)
+{
+	int tx_complete;
+	int work_done;
+	struct qlcnic_host_sds_ring *sds_ring;
+	struct qlcnic_adapter *adapter;
+	struct qlcnic_host_tx_ring *tx_ring;
+
+	sds_ring = container_of(napi, struct qlcnic_host_sds_ring, napi);
+	adapter = sds_ring->adapter;
+	/* tx ring count = 1 */
+	tx_ring = adapter->tx_ring;
+
+	tx_complete = qlcnic_process_cmd_ring(adapter, tx_ring, budget);
+	work_done = qlcnic_83xx_process_rcv_ring(sds_ring, budget);
+	if ((work_done < budget) && tx_complete) {
+		napi_complete(&sds_ring->napi);
+		qlcnic_83xx_enable_intr(adapter, sds_ring);
+	}
+
+	return work_done;
+}
+
 static int qlcnic_83xx_poll(struct napi_struct *napi, int budget)
 {
 	int tx_complete;
@@ -1768,7 +1791,8 @@ void qlcnic_83xx_napi_enable(struct qlcnic_adapter *adapter)
 			qlcnic_83xx_enable_intr(adapter, sds_ring);
 	}
 
-	if (adapter->flags & QLCNIC_MSIX_ENABLED) {
+	if ((adapter->flags & QLCNIC_MSIX_ENABLED) &&
+	    !(adapter->flags & QLCNIC_TX_INTR_SHARED)) {
 		for (ring = 0; ring < adapter->max_drv_tx_rings; ring++) {
 			tx_ring = &adapter->tx_ring[ring];
 			napi_enable(&tx_ring->napi);
@@ -1795,7 +1819,8 @@ void qlcnic_83xx_napi_disable(struct qlcnic_adapter *adapter)
 		napi_disable(&sds_ring->napi);
 	}
 
-	if (adapter->flags & QLCNIC_MSIX_ENABLED) {
+	if ((adapter->flags & QLCNIC_MSIX_ENABLED) &&
+	    !(adapter->flags & QLCNIC_TX_INTR_SHARED)) {
 		for (ring = 0; ring < adapter->max_drv_tx_rings; ring++) {
 			tx_ring = &adapter->tx_ring[ring];
 			qlcnic_83xx_disable_tx_intr(adapter, tx_ring);
@@ -1808,7 +1833,7 @@ void qlcnic_83xx_napi_disable(struct qlcnic_adapter *adapter)
 int qlcnic_83xx_napi_add(struct qlcnic_adapter *adapter,
 			 struct net_device *netdev)
 {
-	int ring, max_sds_rings;
+	int ring, max_sds_rings, temp;
 	struct qlcnic_host_sds_ring *sds_ring;
 	struct qlcnic_host_tx_ring *tx_ring;
 	struct qlcnic_recv_context *recv_ctx = adapter->recv_ctx;
@@ -1819,14 +1844,23 @@ int qlcnic_83xx_napi_add(struct qlcnic_adapter *adapter,
 	max_sds_rings = adapter->max_sds_rings;
 	for (ring = 0; ring < adapter->max_sds_rings; ring++) {
 		sds_ring = &recv_ctx->sds_rings[ring];
-		if (adapter->flags & QLCNIC_MSIX_ENABLED)
-			netif_napi_add(netdev, &sds_ring->napi,
-				       qlcnic_83xx_rx_poll,
-				       QLCNIC_NETDEV_WEIGHT * 2);
-		else
+		if (adapter->flags & QLCNIC_MSIX_ENABLED) {
+			if (!(adapter->flags & QLCNIC_TX_INTR_SHARED)) {
+				netif_napi_add(netdev, &sds_ring->napi,
+					       qlcnic_83xx_rx_poll,
+					       QLCNIC_NETDEV_WEIGHT * 2);
+			} else {
+				temp = QLCNIC_NETDEV_WEIGHT / max_sds_rings;
+				netif_napi_add(netdev, &sds_ring->napi,
+					       qlcnic_83xx_msix_sriov_vf_poll,
+					       temp);
+			}
+
+		} else {
 			netif_napi_add(netdev, &sds_ring->napi,
 				       qlcnic_83xx_poll,
 				       QLCNIC_NETDEV_WEIGHT / max_sds_rings);
+		}
 	}
 
 	if (qlcnic_alloc_tx_rings(adapter, netdev)) {
@@ -1834,7 +1868,8 @@ int qlcnic_83xx_napi_add(struct qlcnic_adapter *adapter,
 		return -ENOMEM;
 	}
 
-	if (adapter->flags & QLCNIC_MSIX_ENABLED) {
+	if ((adapter->flags & QLCNIC_MSIX_ENABLED) &&
+	    !(adapter->flags & QLCNIC_TX_INTR_SHARED)) {
 		for (ring = 0; ring < adapter->max_drv_tx_rings; ring++) {
 			tx_ring = &adapter->tx_ring[ring];
 			netif_napi_add(netdev, &tx_ring->napi,
@@ -1860,7 +1895,8 @@ void qlcnic_83xx_napi_del(struct qlcnic_adapter *adapter)
 
 	qlcnic_free_sds_rings(adapter->recv_ctx);
 
-	if ((adapter->flags & QLCNIC_MSIX_ENABLED)) {
+	if ((adapter->flags & QLCNIC_MSIX_ENABLED) &&
+	    !(adapter->flags & QLCNIC_TX_INTR_SHARED)) {
 		for (ring = 0; ring < adapter->max_drv_tx_rings; ring++) {
 			tx_ring = &adapter->tx_ring[ring];
 			netif_napi_del(&tx_ring->napi);

drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c

@@ -400,7 +400,15 @@ int qlcnic_enable_msix(struct qlcnic_adapter *adapter, u32 num_msix)
 {
 	struct pci_dev *pdev = adapter->pdev;
 	int err = -1, i;
-	int max_tx_rings;
+	int max_tx_rings, tx_vector;
+
+	if (adapter->flags & QLCNIC_TX_INTR_SHARED) {
+		max_tx_rings = 0;
+		tx_vector = 0;
+	} else {
+		max_tx_rings = adapter->max_drv_tx_rings;
+		tx_vector = 1;
+	}
 
 	if (!adapter->msix_entries) {
 		adapter->msix_entries = kcalloc(num_msix,
@@ -423,7 +431,6 @@ int qlcnic_enable_msix(struct qlcnic_adapter *adapter, u32 num_msix)
 			if (qlcnic_83xx_check(adapter)) {
 				adapter->ahw->num_msix = num_msix;
 				/* subtract mail box and tx ring vectors */
-				max_tx_rings = adapter->max_drv_tx_rings;
 				adapter->max_sds_rings = num_msix -
 							 max_tx_rings - 1;
 			} else {
@@ -436,11 +443,11 @@ int qlcnic_enable_msix(struct qlcnic_adapter *adapter, u32 num_msix)
 				 "Unable to allocate %d MSI-X interrupt vectors\n",
 				 num_msix);
 			if (qlcnic_83xx_check(adapter)) {
-				if (err < QLC_83XX_MINIMUM_VECTOR)
+				if (err < (QLC_83XX_MINIMUM_VECTOR - tx_vector))
 					return err;
-				err -= (adapter->max_drv_tx_rings + 1);
+				err -= (max_tx_rings + 1);
 				num_msix = rounddown_pow_of_two(err);
-				num_msix += (adapter->max_drv_tx_rings + 1);
+				num_msix += (max_tx_rings + 1);
 			} else {
 				num_msix = rounddown_pow_of_two(err);
 			}
@@ -1285,7 +1292,8 @@ qlcnic_request_irq(struct qlcnic_adapter *adapter)
 			}
 		}
 		if (qlcnic_83xx_check(adapter) &&
-		    (adapter->flags & QLCNIC_MSIX_ENABLED)) {
+		    (adapter->flags & QLCNIC_MSIX_ENABLED) &&
+		    !(adapter->flags & QLCNIC_TX_INTR_SHARED)) {
 			handler = qlcnic_msix_tx_intr;
 			for (ring = 0; ring < adapter->max_drv_tx_rings;
 			     ring++) {
@@ -1321,7 +1329,8 @@ qlcnic_free_irq(struct qlcnic_adapter *adapter)
 				free_irq(sds_ring->irq, sds_ring);
 			}
 		}
-		if (qlcnic_83xx_check(adapter)) {
+		if (qlcnic_83xx_check(adapter) &&
+		    !(adapter->flags & QLCNIC_TX_INTR_SHARED)) {
 			for (ring = 0; ring < adapter->max_drv_tx_rings;
 			     ring++) {
 				tx_ring = &adapter->tx_ring[ring];

drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_common.c

@@ -137,6 +137,7 @@ int qlcnic_sriov_vf_init(struct qlcnic_adapter *adapter, int pci_using_dac)
 	spin_lock_init(&ahw->mbx_lock);
 	set_bit(QLC_83XX_MBX_READY, &adapter->ahw->idc.status);
 	ahw->msix_supported = 1;
+	adapter->flags |= QLCNIC_TX_INTR_SHARED;
 
 	if (qlcnic_sriov_setup_vf(adapter, pci_using_dac))
 		return -EIO;