ehea: NAPI multi queue TX/RX path for SMP

This patch provides a functionality that allows parallel
RX processing on multiple RX queues by using dummy netdevices.

Signed-off-by: Jan-Bernd Themann <themann@de.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

3 files changed, 169 insertions, 129 deletions

diff --git a/drivers/net/ehea/ehea.h b/drivers/net/ehea/ehea.h
index e595d6b38e7..d593513f82d 100644
--- a/drivers/net/ehea/ehea.h
+++ b/drivers/net/ehea/ehea.h
@@ -39,7 +39,7 @@
 #include <asm/io.h>
 
 #define DRV_NAME	"ehea"
-#define DRV_VERSION	"EHEA_0048"
+#define DRV_VERSION	"EHEA_0052"
 
 #define EHEA_MSG_DEFAULT (NETIF_MSG_LINK | NETIF_MSG_TIMER \
 	| NETIF_MSG_RX_ERR | NETIF_MSG_TX_ERR)
@@ -78,8 +78,6 @@
 #define EHEA_RQ2_PKT_SIZE       1522
 #define EHEA_L_PKT_SIZE         256	/* low latency */
 
-#define EHEA_POLL_MAX_RWQE      1000
-
 /* Send completion signaling */
 #define EHEA_SIG_IV_LONG           1
 
@@ -357,8 +355,8 @@ struct ehea_port_res {
 	struct ehea_qp *qp;
 	struct ehea_cq *send_cq;
 	struct ehea_cq *recv_cq;
-	struct ehea_eq *send_eq;
-	struct ehea_eq *recv_eq;
+	struct ehea_eq *eq;
+	struct net_device *d_netdev;
 	spinlock_t send_lock;
 	struct ehea_q_skb_arr rq1_skba;
 	struct ehea_q_skb_arr rq2_skba;
@@ -372,7 +370,6 @@ struct ehea_port_res {
 	int swqe_count;
 	u32 swqe_id_counter;
 	u64 tx_packets;
-	struct tasklet_struct send_comp_task;
 	spinlock_t recv_lock;
 	struct port_state p_state;
 	u64 rx_packets;
@@ -416,7 +413,9 @@ struct ehea_port {
 	char int_aff_name[EHEA_IRQ_NAME_SIZE];
 	int allmulti;			 /* Indicates IFF_ALLMULTI state */
 	int promisc;		 	 /* Indicates IFF_PROMISC state */
+	int num_tx_qps;
 	int num_add_tx_qps;
+	int num_mcs;
 	int resets;
 	u64 mac_addr;
 	u32 logical_port_id;
diff --git a/drivers/net/ehea/ehea_main.c b/drivers/net/ehea/ehea_main.c
index 3527b391214..8d65eb772b2 100644
--- a/drivers/net/ehea/ehea_main.c
+++ b/drivers/net/ehea/ehea_main.c
@@ -51,13 +51,18 @@ static int rq1_entries = EHEA_DEF_ENTRIES_RQ1;
 static int rq2_entries = EHEA_DEF_ENTRIES_RQ2;
 static int rq3_entries = EHEA_DEF_ENTRIES_RQ3;
 static int sq_entries = EHEA_DEF_ENTRIES_SQ;
+static int use_mcs = 0;
+static int num_tx_qps = EHEA_NUM_TX_QP;
 
 module_param(msg_level, int, 0);
 module_param(rq1_entries, int, 0);
 module_param(rq2_entries, int, 0);
 module_param(rq3_entries, int, 0);
 module_param(sq_entries, int, 0);
+module_param(use_mcs, int, 0);
+module_param(num_tx_qps, int, 0);
 
+MODULE_PARM_DESC(num_tx_qps, "Number of TX-QPS");
 MODULE_PARM_DESC(msg_level, "msg_level");
 MODULE_PARM_DESC(rq3_entries, "Number of entries for Receive Queue 3 "
 		 "[2^x - 1], x = [6..14]. Default = "
@@ -71,6 +76,7 @@ MODULE_PARM_DESC(rq1_entries, "Number of entries for Receive Queue 1 "
 MODULE_PARM_DESC(sq_entries, " Number of entries for the Send Queue  "
 		 "[2^x - 1], x = [6..14]. Default = "
 		 __MODULE_STRING(EHEA_DEF_ENTRIES_SQ) ")");
+MODULE_PARM_DESC(use_mcs, " 0:NAPI, 1:Multiple receive queues, Default = 1 ");
 
 void ehea_dump(void *adr, int len, char *msg) {
 	int x;
@@ -197,7 +203,7 @@ static int ehea_refill_rq_def(struct ehea_port_res *pr,
 		struct sk_buff *skb = netdev_alloc_skb(dev, packet_size);
 		if (!skb) {
 			ehea_error("%s: no mem for skb/%d wqes filled",
-				   dev->name, i);
+				   pr->port->netdev->name, i);
 			q_skba->os_skbs = fill_wqes - i;
 			ret = -ENOMEM;
 			break;
@@ -345,10 +351,11 @@ static int ehea_treat_poll_error(struct ehea_port_res *pr, int rq,
 	return 0;
 }
 
-static int ehea_poll(struct net_device *dev, int *budget)
+static struct ehea_cqe *ehea_proc_rwqes(struct net_device *dev,
+					struct ehea_port_res *pr,
+					int *budget)
 {
-	struct ehea_port *port = netdev_priv(dev);
-	struct ehea_port_res *pr = &port->port_res[0];
+	struct ehea_port *port = pr->port;
 	struct ehea_qp *qp = pr->qp;
 	struct ehea_cqe *cqe;
 	struct sk_buff *skb;
@@ -359,14 +366,12 @@ static int ehea_poll(struct net_device *dev, int *budget)
 	int skb_arr_rq2_len = pr->rq2_skba.len;
 	int skb_arr_rq3_len = pr->rq3_skba.len;
 	int processed, processed_rq1, processed_rq2, processed_rq3;
-	int wqe_index, last_wqe_index, rq, intreq, my_quota, port_reset;
+	int wqe_index, last_wqe_index, rq, my_quota, port_reset;
 
 	processed = processed_rq1 = processed_rq2 = processed_rq3 = 0;
 	last_wqe_index = 0;
 	my_quota = min(*budget, dev->quota);
-	my_quota = min(my_quota, EHEA_POLL_MAX_RWQE);
 
-	/* rq0 is low latency RQ */
 	cqe = ehea_poll_rq1(qp, &wqe_index);
 	while ((my_quota > 0) && cqe) {
 		ehea_inc_rq1(qp);
@@ -386,7 +391,8 @@ static int ehea_poll(struct net_device *dev, int *budget)
 				if (unlikely(!skb)) {
 					if (netif_msg_rx_err(port))
 						ehea_error("LL rq1: skb=NULL");
-					skb = netdev_alloc_skb(dev,
+
+					skb = netdev_alloc_skb(port->netdev,
 							       EHEA_L_PKT_SIZE);
 					if (!skb)
 						break;
@@ -402,7 +408,7 @@ static int ehea_poll(struct net_device *dev, int *budget)
 						ehea_error("rq2: skb=NULL");
 					break;
 				}
-				ehea_fill_skb(dev, skb, cqe);
+				ehea_fill_skb(port->netdev, skb, cqe);
 				processed_rq2++;
 			} else {  /* RQ3 */
 				skb = get_skb_by_index(skb_arr_rq3,
@@ -412,7 +418,7 @@ static int ehea_poll(struct net_device *dev, int *budget)
 						ehea_error("rq3: skb=NULL");
 					break;
 				}
-				ehea_fill_skb(dev, skb, cqe);
+				ehea_fill_skb(port->netdev, skb, cqe);
 				processed_rq3++;
 			}
 
@@ -421,8 +427,7 @@ static int ehea_poll(struct net_device *dev, int *budget)
 							 cqe->vlan_tag);
 			else
 				netif_receive_skb(skb);
-
-		} else { /* Error occured */
+		} else {
 			pr->p_state.poll_receive_errors++;
 			port_reset = ehea_treat_poll_error(pr, rq, cqe,
 							   &processed_rq2,
@@ -433,32 +438,18 @@ static int ehea_poll(struct net_device *dev, int *budget)
 		cqe = ehea_poll_rq1(qp, &wqe_index);
 	}
 
-	dev->quota -= processed;
-	*budget -= processed;
-
-	pr->p_state.ehea_poll += 1;
 	pr->rx_packets += processed;
+	*budget -= processed;
 
 	ehea_refill_rq1(pr, last_wqe_index, processed_rq1);
 	ehea_refill_rq2(pr, processed_rq2);
 	ehea_refill_rq3(pr, processed_rq3);
 
-	intreq = ((pr->p_state.ehea_poll & 0xF) == 0xF);
-
-	if (!cqe || intreq) {
-		netif_rx_complete(dev);
-		ehea_reset_cq_ep(pr->recv_cq);
-		ehea_reset_cq_n1(pr->recv_cq);
-		cqe = hw_qeit_get_valid(&qp->hw_rqueue1);
-		if (!cqe || intreq)
-			return 0;
-		if (!netif_rx_reschedule(dev, my_quota))
-			return 0;
-	}
-	return 1;
+	cqe = ehea_poll_rq1(qp, &wqe_index);
+	return cqe;
 }
 
-void free_sent_skbs(struct ehea_cqe *cqe, struct ehea_port_res *pr)
+static void ehea_free_sent_skbs(struct ehea_cqe *cqe, struct ehea_port_res *pr)
 {
 	struct sk_buff *skb;
 	int index, max_index_mask, i;
@@ -479,26 +470,19 @@ void free_sent_skbs(struct ehea_cqe *cqe, struct ehea_port_res *pr)
 	}
 }
 
-#define MAX_SENDCOMP_QUOTA 400
-void ehea_send_irq_tasklet(unsigned long data)
+static struct ehea_cqe *ehea_proc_cqes(struct ehea_port_res *pr, int my_quota)
 {
-	struct ehea_port_res *pr = (struct ehea_port_res*)data;
 	struct ehea_cq *send_cq = pr->send_cq;
 	struct ehea_cqe *cqe;
-	int quota = MAX_SENDCOMP_QUOTA;
+	int quota = my_quota;
 	int cqe_counter = 0;
 	int swqe_av = 0;
 	unsigned long flags;
 
-	do {
-		cqe = ehea_poll_cq(send_cq);
-		if (!cqe) {
-			ehea_reset_cq_ep(send_cq);
-			ehea_reset_cq_n1(send_cq);
-			cqe = ehea_poll_cq(send_cq);
-			if (!cqe)
-				break;
-		}
+	cqe = ehea_poll_cq(send_cq);
+	while(cqe && (quota > 0)) {
+		ehea_inc_cq(send_cq);
+
 		cqe_counter++;
 		rmb();
 		if (cqe->status & EHEA_CQE_STAT_ERR_MASK) {
@@ -515,16 +499,19 @@ void ehea_send_irq_tasklet(unsigned long data)
 
 		if (likely(EHEA_BMASK_GET(EHEA_WR_ID_TYPE, cqe->wr_id)
 			   == EHEA_SWQE2_TYPE))
-			free_sent_skbs(cqe, pr);
+			ehea_free_sent_skbs(cqe, pr);
 
 		swqe_av += EHEA_BMASK_GET(EHEA_WR_ID_REFILL, cqe->wr_id);
 		quota--;
-	} while (quota > 0);
+
+		cqe = ehea_poll_cq(send_cq);
+	};
 
 	ehea_update_feca(send_cq, cqe_counter);
 	atomic_add(swqe_av, &pr->swqe_avail);
 
 	spin_lock_irqsave(&pr->netif_queue, flags);
+
 	if (pr->queue_stopped && (atomic_read(&pr->swqe_avail)
 				  >= pr->swqe_refill_th)) {
 		netif_wake_queue(pr->port->netdev);
@@ -532,22 +519,55 @@ void ehea_send_irq_tasklet(unsigned long data)
 	}
 	spin_unlock_irqrestore(&pr->netif_queue, flags);
 
-	if (unlikely(cqe))
-		tasklet_hi_schedule(&pr->send_comp_task);
+	return cqe;
 }
 
-static irqreturn_t ehea_send_irq_handler(int irq, void *param)
+#define EHEA_NAPI_POLL_NUM_BEFORE_IRQ 16
+
+static int ehea_poll(struct net_device *dev, int *budget)
 {
-	struct ehea_port_res *pr = param;
-	tasklet_hi_schedule(&pr->send_comp_task);
-	return IRQ_HANDLED;
+	struct ehea_port_res *pr = dev->priv;
+	struct ehea_cqe *cqe;
+	struct ehea_cqe *cqe_skb = NULL;
+	int force_irq, wqe_index;
+
+	cqe = ehea_poll_rq1(pr->qp, &wqe_index);
+	cqe_skb = ehea_poll_cq(pr->send_cq);
+
+	force_irq = (pr->poll_counter > EHEA_NAPI_POLL_NUM_BEFORE_IRQ);
+
+	if ((!cqe && !cqe_skb) || force_irq) {
+		pr->poll_counter = 0;
+		netif_rx_complete(dev);
+		ehea_reset_cq_ep(pr->recv_cq);
+		ehea_reset_cq_ep(pr->send_cq);
+		ehea_reset_cq_n1(pr->recv_cq);
+		ehea_reset_cq_n1(pr->send_cq);
+		cqe = ehea_poll_rq1(pr->qp, &wqe_index);
+		cqe_skb = ehea_poll_cq(pr->send_cq);
+
+		if (!cqe && !cqe_skb) 
+			return 0;
+
+		if (!netif_rx_reschedule(dev, dev->quota)) 
+			return 0;
+	}
+	
+	cqe = ehea_proc_rwqes(dev, pr, budget);
+	cqe_skb = ehea_proc_cqes(pr, 300);
+
+	if (cqe || cqe_skb)
+		pr->poll_counter++;
+       
+	return 1;
 }
 
 static irqreturn_t ehea_recv_irq_handler(int irq, void *param)
 {
 	struct ehea_port_res *pr = param;
-	struct ehea_port *port = pr->port;
-	netif_rx_schedule(port->netdev);
+
+	netif_rx_schedule(pr->d_netdev);
+
 	return IRQ_HANDLED;
 }
 
@@ -650,19 +670,25 @@ int ehea_sense_port_attr(struct ehea_port *port)
 	}
 
 	port->autoneg = 1;
+	port->num_mcs = cb0->num_default_qps;
 
 	/* Number of default QPs */
-	port->num_def_qps = cb0->num_default_qps;
+	if (use_mcs)
+		port->num_def_qps = cb0->num_default_qps;
+	else
+		port->num_def_qps = 1;
 
 	if (!port->num_def_qps) {
 		ret = -EINVAL;
 		goto out_free;
 	}
 
-	if (port->num_def_qps >= EHEA_NUM_TX_QP)
+	port->num_tx_qps = num_tx_qps;
+
+	if (port->num_def_qps >= port->num_tx_qps)
 		port->num_add_tx_qps = 0;
 	else
-		port->num_add_tx_qps = EHEA_NUM_TX_QP - port->num_def_qps;
+		port->num_add_tx_qps = port->num_tx_qps - port->num_def_qps;
 
 	ret = 0;
 out_free:
@@ -882,23 +908,6 @@ static int ehea_reg_interrupts(struct net_device *dev)
 	struct ehea_port_res *pr;
 	int i, ret;
 
-	for (i = 0; i < port->num_def_qps; i++) {
-		pr = &port->port_res[i];
-		snprintf(pr->int_recv_name, EHEA_IRQ_NAME_SIZE - 1
-			 , "%s-recv%d", dev->name, i);
-		ret = ibmebus_request_irq(NULL, pr->recv_eq->attr.ist1,
-					  ehea_recv_irq_handler,
-					  IRQF_DISABLED, pr->int_recv_name, pr);
-		if (ret) {
-			ehea_error("failed registering irq for ehea_recv_int:"
-				   "port_res_nr:%d, ist=%X", i,
-				   pr->recv_eq->attr.ist1);
-			goto out_free_seq;
-		}
-		if (netif_msg_ifup(port))
-			ehea_info("irq_handle 0x%X for funct ehea_recv_int %d "
-				  "registered", pr->recv_eq->attr.ist1, i);
-	}
 
 	snprintf(port->int_aff_name, EHEA_IRQ_NAME_SIZE - 1, "%s-aff",
 		 dev->name);
@@ -916,41 +925,41 @@ static int ehea_reg_interrupts(struct net_device *dev)
 		ehea_info("irq_handle 0x%X for function qp_aff_irq_handler "
 			  "registered", port->qp_eq->attr.ist1);
 
+
 	for (i = 0; i < port->num_def_qps + port->num_add_tx_qps; i++) {
 		pr = &port->port_res[i];
 		snprintf(pr->int_send_name, EHEA_IRQ_NAME_SIZE - 1,
-			 "%s-send%d", dev->name, i);
-		ret = ibmebus_request_irq(NULL, pr->send_eq->attr.ist1,
-					  ehea_send_irq_handler,
+			 "%s-queue%d", dev->name, i);
+		ret = ibmebus_request_irq(NULL, pr->eq->attr.ist1,
+					  ehea_recv_irq_handler,
 					  IRQF_DISABLED, pr->int_send_name,
 					  pr);
 		if (ret) {
-			ehea_error("failed registering irq for ehea_send "
+			ehea_error("failed registering irq for ehea_queue "
 				   "port_res_nr:%d, ist=%X", i,
-				   pr->send_eq->attr.ist1);
+				   pr->eq->attr.ist1);
 			goto out_free_req;
 		}
 		if (netif_msg_ifup(port))
-			ehea_info("irq_handle 0x%X for function ehea_send_int "
-				  "%d registered", pr->send_eq->attr.ist1, i);
+			ehea_info("irq_handle 0x%X for function ehea_queue_int "
+				  "%d registered", pr->eq->attr.ist1, i);
 	}
 out:
 	return ret;
 
+
 out_free_req:
 	while (--i >= 0) {
-		u32 ist = port->port_res[i].send_eq->attr.ist1;
+		u32 ist = port->port_res[i].eq->attr.ist1;
 		ibmebus_free_irq(NULL, ist, &port->port_res[i]);
 	}
+
 out_free_qpeq:
 	ibmebus_free_irq(NULL, port->qp_eq->attr.ist1, port);
 	i = port->num_def_qps;
-out_free_seq:
-	while (--i >= 0) {
-		u32 ist = port->port_res[i].recv_eq->attr.ist1;
-		ibmebus_free_irq(NULL, ist, &port->port_res[i]);
-	}
+
 	goto out;
+
 }
 
 static void ehea_free_interrupts(struct net_device *dev)
@@ -960,21 +969,13 @@ static void ehea_free_interrupts(struct net_device *dev)
 	int i;
 
 	/* send */
+
 	for (i = 0; i < port->num_def_qps + port->num_add_tx_qps; i++) {
 		pr = &port->port_res[i];
-		ibmebus_free_irq(NULL, pr->send_eq->attr.ist1, pr);
+		ibmebus_free_irq(NULL, pr->eq->attr.ist1, pr);
 		if (netif_msg_intr(port))
 			ehea_info("free send irq for res %d with handle 0x%X",
-				  i, pr->send_eq->attr.ist1);
-	}
-
-	/* receive */
-	for (i = 0; i < port->num_def_qps; i++) {
-		pr = &port->port_res[i];
-		ibmebus_free_irq(NULL, pr->recv_eq->attr.ist1, pr);
-		if (netif_msg_intr(port))
-			ehea_info("free recv irq for res %d with handle 0x%X",
-				  i, pr->recv_eq->attr.ist1);
+				  i, pr->eq->attr.ist1);
 	}
 
 	/* associated events */
@@ -1003,9 +1004,14 @@ static int ehea_configure_port(struct ehea_port *port)
 				      PXLY_RC_VLAN_FILTER)
 		     | EHEA_BMASK_SET(PXLY_RC_JUMBO_FRAME, 1);
 
-	for (i = 0; i < port->num_def_qps; i++)
-		cb0->default_qpn_arr[i] = port->port_res[0].qp->init_attr.qp_nr;
-
+	for (i = 0; i < port->num_mcs; i++)
+		if (use_mcs)
+			cb0->default_qpn_arr[i] =
+				port->port_res[i].qp->init_attr.qp_nr;
+		else
+			cb0->default_qpn_arr[i] =
+				port->port_res[0].qp->init_attr.qp_nr;
+	
 	if (netif_msg_ifup(port))
 		ehea_dump(cb0, sizeof(*cb0), "ehea_configure_port");
 
@@ -1108,20 +1114,14 @@ static int ehea_init_port_res(struct ehea_port *port, struct ehea_port_res *pr,
 	spin_lock_init(&pr->xmit_lock);
 	spin_lock_init(&pr->netif_queue);
 
-	pr->recv_eq = ehea_create_eq(adapter, eq_type, EHEA_MAX_ENTRIES_EQ, 0);
-	if (!pr->recv_eq) {
-		ehea_error("create_eq failed (recv_eq)");
-		goto out_free;
-	}
-
-	pr->send_eq = ehea_create_eq(adapter, eq_type, EHEA_MAX_ENTRIES_EQ, 0);
-	if (!pr->send_eq) {
-		ehea_error("create_eq failed (send_eq)");
+	pr->eq = ehea_create_eq(adapter, eq_type, EHEA_MAX_ENTRIES_EQ, 0);
+	if (!pr->eq) {
+		ehea_error("create_eq failed (eq)");
 		goto out_free;
 	}
 
 	pr->recv_cq = ehea_create_cq(adapter, pr_cfg->max_entries_rcq,
-				     pr->recv_eq->fw_handle,
+				     pr->eq->fw_handle,
 				     port->logical_port_id);
 	if (!pr->recv_cq) {
 		ehea_error("create_cq failed (cq_recv)");
@@ -1129,7 +1129,7 @@ static int ehea_init_port_res(struct ehea_port *port, struct ehea_port_res *pr,
 	}
 
 	pr->send_cq = ehea_create_cq(adapter, pr_cfg->max_entries_scq,
-				     pr->send_eq->fw_handle,
+				     pr->eq->fw_handle,
 				     port->logical_port_id);
 	if (!pr->send_cq) {
 		ehea_error("create_cq failed (cq_send)");
@@ -1194,11 +1194,20 @@ static int ehea_init_port_res(struct ehea_port *port, struct ehea_port_res *pr,
 		ret = -EIO;
 		goto out_free;
 	}
-	tasklet_init(&pr->send_comp_task, ehea_send_irq_tasklet,
-		     (unsigned long)pr);
+
 	atomic_set(&pr->swqe_avail, init_attr->act_nr_send_wqes - 1);
 
 	kfree(init_attr);
+
+	pr->d_netdev = alloc_netdev(0, "", ether_setup);
+	if (!pr->d_netdev)
+		goto out_free;
+	pr->d_netdev->priv = pr;
+	pr->d_netdev->weight = 64;
+	pr->d_netdev->poll = ehea_poll;
+	set_bit(__LINK_STATE_START, &pr->d_netdev->state);
+	strcpy(pr->d_netdev->name, port->netdev->name);
+
 	ret = 0;
 	goto out;
 
@@ -1211,8 +1220,7 @@ out_free:
 	ehea_destroy_qp(pr->qp);
 	ehea_destroy_cq(pr->send_cq);
 	ehea_destroy_cq(pr->recv_cq);
-	ehea_destroy_eq(pr->send_eq);
-	ehea_destroy_eq(pr->recv_eq);
+	ehea_destroy_eq(pr->eq);
 out:
 	return ret;
 }
@@ -1221,13 +1229,14 @@ static int ehea_clean_portres(struct ehea_port *port, struct ehea_port_res *pr)
 {
 	int ret, i;
 
+	free_netdev(pr->d_netdev);
+
 	ret = ehea_destroy_qp(pr->qp);
 
 	if (!ret) {
 		ehea_destroy_cq(pr->send_cq);
 		ehea_destroy_cq(pr->recv_cq);
-		ehea_destroy_eq(pr->send_eq);
-		ehea_destroy_eq(pr->recv_eq);
+		ehea_destroy_eq(pr->eq);
 
 		for (i = 0; i < pr->rq1_skba.len; i++)
 			if (pr->rq1_skba.arr[i])
@@ -1792,6 +1801,22 @@ static void ehea_xmit3(struct sk_buff *skb, struct net_device *dev,
 	dev_kfree_skb(skb);
 }
 
+static inline int ehea_hash_skb(struct sk_buff *skb, int num_qps)
+{
+	struct tcphdr *tcp;
+	u32 tmp;
+
+	if ((skb->protocol == htons(ETH_P_IP)) &&
+	    (skb->nh.iph->protocol == IPPROTO_TCP)) {
+		tcp = (struct tcphdr*)(skb->nh.raw + (skb->nh.iph->ihl * 4));
+		tmp = (tcp->source + (tcp->dest << 16)) % 31;
+		tmp += skb->nh.iph->daddr % 31;
+		return tmp % num_qps;
+	}
+	else
+		return 0;
+}
+
 static int ehea_start_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	struct ehea_port *port = netdev_priv(dev);
@@ -1799,9 +1824,18 @@ static int ehea_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	unsigned long flags;
 	u32 lkey;
 	int swqe_index;
-	struct ehea_port_res *pr = &port->port_res[0];
+	struct ehea_port_res *pr;
+
+	pr = &port->port_res[ehea_hash_skb(skb, port->num_tx_qps)];
+
 
-	spin_lock(&pr->xmit_lock);
+	if (!spin_trylock(&pr->xmit_lock))
+		return NETDEV_TX_BUSY;
+
+	if (pr->queue_stopped) {
+		spin_unlock(&pr->xmit_lock);
+		return NETDEV_TX_BUSY;
+	}
 
 	swqe = ehea_get_swqe(pr->qp, &swqe_index);
 	memset(swqe, 0, SWQE_HEADER_SIZE);
@@ -2060,7 +2094,7 @@ static int ehea_port_res_setup(struct ehea_port *port, int def_qps,
 	}
 
 	pr_cfg.max_entries_rcq = rq1_entries + rq2_entries + rq3_entries;
-	pr_cfg.max_entries_scq = sq_entries;
+	pr_cfg.max_entries_scq = sq_entries * 2;
 	pr_cfg.max_entries_sq = sq_entries;
 	pr_cfg.max_entries_rq1 = rq1_entries;
 	pr_cfg.max_entries_rq2 = rq2_entries;
@@ -2208,8 +2242,10 @@ static int ehea_down(struct net_device *dev)
 	ehea_drop_multicast_list(dev);
 	ehea_free_interrupts(dev);
 
-	for (i = 0; i < port->num_def_qps + port->num_add_tx_qps; i++)
-		tasklet_kill(&port->port_res[i].send_comp_task);
+	for (i = 0; i < port->num_def_qps; i++)
+		while (test_bit(__LINK_STATE_RX_SCHED, 
+				&port->port_res[i].d_netdev->state))
+			msleep(1);
 
 	ehea_broadcast_reg_helper(port, H_DEREG_BCMC);
 	ret = ehea_clean_all_portres(port);
diff --git a/drivers/net/ehea/ehea_qmr.h b/drivers/net/ehea/ehea_qmr.h
index 1ff60983504..99d6b70a087 100644
--- a/drivers/net/ehea/ehea_qmr.h
+++ b/drivers/net/ehea/ehea_qmr.h
@@ -320,6 +320,11 @@ static inline struct ehea_cqe *ehea_poll_rq1(struct ehea_qp *qp, int *wqe_index)
 	return hw_qeit_get_valid(queue);
 }
 
+static inline void ehea_inc_cq(struct ehea_cq *cq)
+{
+	hw_qeit_inc(&cq->hw_queue);
+}
+
 static inline void ehea_inc_rq1(struct ehea_qp *qp)
 {
 	hw_qeit_inc(&qp->hw_rqueue1);
@@ -327,7 +332,7 @@ static inline void ehea_inc_rq1(struct ehea_qp *qp)
 
 static inline struct ehea_cqe *ehea_poll_cq(struct ehea_cq *my_cq)
 {
-	return hw_qeit_get_inc_valid(&my_cq->hw_queue);
+	return hw_qeit_get_valid(&my_cq->hw_queue);
 }
 
 #define EHEA_CQ_REGISTER_ORIG 0