These changes are the raw update to linux-4.4.6-rt14. Kernel sources

are taken from kernel.org, and rt patch from the rt wiki download page.

During the rebasing, the following patch collided:

Force tick interrupt and get rid of softirq magic(I70131fb85).

Collisions have been removed because its logic was found on the
source already.

Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>

1 files changed, 27 insertions, 64 deletions

diff --git a/kernel/drivers/net/ethernet/cisco/enic/vnic_rq.h b/kernel/drivers/net/ethernet/cisco/enic/vnic_rq.h
index 8111d5202..b9c82f143 100644
--- a/kernel/drivers/net/ethernet/cisco/enic/vnic_rq.h
+++ b/kernel/drivers/net/ethernet/cisco/enic/vnic_rq.h
@@ -21,6 +21,7 @@
 #define _VNIC_RQ_H_
 
 #include <linux/pci.h>
+#include <linux/netdevice.h>
 
 #include "vnic_dev.h"
 #include "vnic_cq.h"
@@ -75,6 +76,12 @@ struct vnic_rq_buf {
 	uint64_t wr_id;
 };
 
+enum enic_poll_state {
+	ENIC_POLL_STATE_IDLE,
+	ENIC_POLL_STATE_NAPI,
+	ENIC_POLL_STATE_POLL
+};
+
 struct vnic_rq {
 	unsigned int index;
 	struct vnic_dev *vdev;
@@ -86,19 +93,7 @@ struct vnic_rq {
 	void *os_buf_head;
 	unsigned int pkts_outstanding;
 #ifdef CONFIG_NET_RX_BUSY_POLL
-#define ENIC_POLL_STATE_IDLE		0
-#define ENIC_POLL_STATE_NAPI		(1 << 0) /* NAPI owns this poll */
-#define ENIC_POLL_STATE_POLL		(1 << 1) /* poll owns this poll */
-#define ENIC_POLL_STATE_NAPI_YIELD	(1 << 2) /* NAPI yielded this poll */
-#define ENIC_POLL_STATE_POLL_YIELD	(1 << 3) /* poll yielded this poll */
-#define ENIC_POLL_YIELD			(ENIC_POLL_STATE_NAPI_YIELD |	\
-					 ENIC_POLL_STATE_POLL_YIELD)
-#define ENIC_POLL_LOCKED		(ENIC_POLL_STATE_NAPI |		\
-					 ENIC_POLL_STATE_POLL)
-#define ENIC_POLL_USER_PEND		(ENIC_POLL_STATE_POLL |		\
-					 ENIC_POLL_STATE_POLL_YIELD)
-	unsigned int bpoll_state;
-	spinlock_t bpoll_lock;
+	atomic_t bpoll_state;
 #endif /* CONFIG_NET_RX_BUSY_POLL */
 };
 
@@ -215,76 +210,43 @@ static inline int vnic_rq_fill(struct vnic_rq *rq,
 #ifdef CONFIG_NET_RX_BUSY_POLL
 static inline void enic_busy_poll_init_lock(struct vnic_rq *rq)
 {
-	spin_lock_init(&rq->bpoll_lock);
-	rq->bpoll_state = ENIC_POLL_STATE_IDLE;
+	atomic_set(&rq->bpoll_state, ENIC_POLL_STATE_IDLE);
 }
 
 static inline bool enic_poll_lock_napi(struct vnic_rq *rq)
 {
-	bool rc = true;
-
-	spin_lock(&rq->bpoll_lock);
-	if (rq->bpoll_state & ENIC_POLL_LOCKED) {
-		WARN_ON(rq->bpoll_state & ENIC_POLL_STATE_NAPI);
-		rq->bpoll_state |= ENIC_POLL_STATE_NAPI_YIELD;
-		rc = false;
-	} else {
-		rq->bpoll_state = ENIC_POLL_STATE_NAPI;
-	}
-	spin_unlock(&rq->bpoll_lock);
+	int rc = atomic_cmpxchg(&rq->bpoll_state, ENIC_POLL_STATE_IDLE,
+				ENIC_POLL_STATE_NAPI);
 
-	return rc;
+	return (rc == ENIC_POLL_STATE_IDLE);
 }
 
-static inline bool enic_poll_unlock_napi(struct vnic_rq *rq)
+static inline void enic_poll_unlock_napi(struct vnic_rq *rq,
+					 struct napi_struct *napi)
 {
-	bool rc = false;
-
-	spin_lock(&rq->bpoll_lock);
-	WARN_ON(rq->bpoll_state &
-		(ENIC_POLL_STATE_POLL | ENIC_POLL_STATE_NAPI_YIELD));
-	if (rq->bpoll_state & ENIC_POLL_STATE_POLL_YIELD)
-		rc = true;
-	rq->bpoll_state = ENIC_POLL_STATE_IDLE;
-	spin_unlock(&rq->bpoll_lock);
-
-	return rc;
+	WARN_ON(atomic_read(&rq->bpoll_state) != ENIC_POLL_STATE_NAPI);
+	napi_gro_flush(napi, false);
+	atomic_set(&rq->bpoll_state, ENIC_POLL_STATE_IDLE);
 }
 
 static inline bool enic_poll_lock_poll(struct vnic_rq *rq)
 {
-	bool rc = true;
-
-	spin_lock_bh(&rq->bpoll_lock);
-	if (rq->bpoll_state & ENIC_POLL_LOCKED) {
-		rq->bpoll_state |= ENIC_POLL_STATE_POLL_YIELD;
-		rc = false;
-	} else {
-		rq->bpoll_state |= ENIC_POLL_STATE_POLL;
-	}
-	spin_unlock_bh(&rq->bpoll_lock);
+	int rc = atomic_cmpxchg(&rq->bpoll_state, ENIC_POLL_STATE_IDLE,
+				ENIC_POLL_STATE_POLL);
 
-	return rc;
+	return (rc == ENIC_POLL_STATE_IDLE);
 }
 
-static inline bool enic_poll_unlock_poll(struct vnic_rq *rq)
-{
-	bool rc = false;
 
-	spin_lock_bh(&rq->bpoll_lock);
-	WARN_ON(rq->bpoll_state & ENIC_POLL_STATE_NAPI);
-	if (rq->bpoll_state & ENIC_POLL_STATE_POLL_YIELD)
-		rc = true;
-	rq->bpoll_state = ENIC_POLL_STATE_IDLE;
-	spin_unlock_bh(&rq->bpoll_lock);
-
-	return rc;
+static inline void enic_poll_unlock_poll(struct vnic_rq *rq)
+{
+	WARN_ON(atomic_read(&rq->bpoll_state) != ENIC_POLL_STATE_POLL);
+	atomic_set(&rq->bpoll_state, ENIC_POLL_STATE_IDLE);
 }
 
 static inline bool enic_poll_busy_polling(struct vnic_rq *rq)
 {
-	WARN_ON(!(rq->bpoll_state & ENIC_POLL_LOCKED));
-	return rq->bpoll_state & ENIC_POLL_USER_PEND;
+	return atomic_read(&rq->bpoll_state) & ENIC_POLL_STATE_POLL;
 }
 
 #else
@@ -298,7 +260,8 @@ static inline bool enic_poll_lock_napi(struct vnic_rq *rq)
 	return true;
 }
 
-static inline bool enic_poll_unlock_napi(struct vnic_rq *rq)
+static inline bool enic_poll_unlock_napi(struct vnic_rq *rq,
+					 struct napi_struct *napi)
 {
 	return false;
 }