[PATCH v8 00/15] common linkstatus functions

[PATCH v8 00/15] common linkstatus functions

[Stephen Hemminger]

While writing hyper-v driver, noticed a lot of unnecessary
duplication of code in drivers for handling the eth_dev link status
information. While consolidating this, it also became obvious that
some drivers behave differently for no good reason.

It also was a good chance to introduce atomic exchange primitives
in EAL because there are other places using cmpset where not
necessary (such as bonding).

Mostly only compile tested only, don't have all of the hardware
available (except ixgbe and virtio) to test.

v8
  - fix typo in 32bit exchange
  - fix build of dpaa2
  - go back to same return value as original code
  - reduce number of lines changed

v7
  - add exchange functions for PPC64
  - move linkstatus helpers to rte_ethdev_driver
  - rebase to 18.02

Stephen Hemminger (15):
  eal: introduce atomic exchange operation
  ethdev: add linkstatus get/set helper functions
  net/virtio: use eth_linkstatus_set
  net/vmxnet3: use rte_eth_linkstatus_set
  net/dpaa2: use rte_eth_linkstatus_set
  net/nfp: use rte_eth_linkstatus functions
  net/e1000: use rte_eth_linkstatus helpers
  net/ixgbe: use rte_eth_linkstatus functions
  net/sfc: use new rte_eth_linkstatus functions
  net/i40e: use rte_eth_linkstatus functions
  net/liquidio: use rte_eth_linkstatus_set
  net/thunderx: use rte_eth_linkstatus_set
  net/szedata: use _rte_eth_linkstatus_set
  net/octeontx: use rte_eth_linkstatus_set
  net/enic: use rte_eth_linkstatus_set

 drivers/net/dpaa2/dpaa2_ethdev.c                   | 78 +++----------------
 drivers/net/e1000/em_ethdev.c                      | 70 ++---------------
 drivers/net/e1000/igb_ethdev.c                     | 71 ++---------------
 drivers/net/enic/enic_ethdev.c                     |  5 +-
 drivers/net/enic/enic_main.c                       | 16 ++--
 drivers/net/i40e/i40e_ethdev.c                     | 46 ++---------
 drivers/net/i40e/i40e_ethdev_vf.c                  | 19 +----
 drivers/net/ixgbe/ixgbe_ethdev.c                   | 90 ++++------------------
 drivers/net/liquidio/lio_ethdev.c                  | 44 +----------
 drivers/net/nfp/nfp_net.c                          | 72 ++---------------
 drivers/net/octeontx/octeontx_ethdev.c             | 16 +---
 drivers/net/sfc/sfc_ethdev.c                       | 24 ++----
 drivers/net/sfc/sfc_ev.c                           | 20 +----
 drivers/net/szedata2/rte_eth_szedata2.c            | 11 +--
 drivers/net/thunderx/nicvf_ethdev.c                | 45 +++++------
 drivers/net/virtio/virtio_ethdev.c                 | 52 ++-----------
 drivers/net/vmxnet3/vmxnet3_ethdev.c               | 63 +--------------
 .../common/include/arch/ppc_64/rte_atomic.h        | 21 ++++-
 .../common/include/arch/x86/rte_atomic.h           | 24 ++++++
 .../common/include/arch/x86/rte_atomic_32.h        | 12 +++
 .../common/include/arch/x86/rte_atomic_64.h        | 12 +++
 lib/librte_eal/common/include/generic/rte_atomic.h | 78 +++++++++++++++++++
 lib/librte_ether/rte_ethdev.c                      | 22 +-----
 lib/librte_ether/rte_ethdev_driver.h               | 63 +++++++++++++++
 24 files changed, 313 insertions(+), 661 deletions(-)

-- 
2.15.1

[PATCH v8 01/15] eal: introduce atomic exchange operation

[Stephen Hemminger]

To handle atomic update of link status (64 bit), every driver
was doing its own version using cmpset.
Atomic exchange is a useful primitive in its own right;
therefore make it a EAL routine.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 .../common/include/arch/ppc_64/rte_atomic.h        | 21 +++++-
 .../common/include/arch/x86/rte_atomic.h           | 24 +++++++
 .../common/include/arch/x86/rte_atomic_32.h        | 12 ++++
 .../common/include/arch/x86/rte_atomic_64.h        | 12 ++++
 lib/librte_eal/common/include/generic/rte_atomic.h | 78 ++++++++++++++++++++++
 5 files changed, 146 insertions(+), 1 deletion(-)

diff --git a/lib/librte_eal/common/include/arch/ppc_64/rte_atomic.h b/lib/librte_eal/common/include/arch/ppc_64/rte_atomic.h
index 150810cdb365..11fa1117a255 100644
--- a/lib/librte_eal/common/include/arch/ppc_64/rte_atomic.h
+++ b/lib/librte_eal/common/include/arch/ppc_64/rte_atomic.h
@@ -132,6 +132,12 @@ static inline int rte_atomic16_dec_and_test(rte_atomic16_t *v)
 	return __atomic_sub_fetch(&v->cnt, 1, __ATOMIC_ACQUIRE) == 0;
 }
 
+static inline uint16_t
+rte_atomic16_exchange(volatile uint16_t *dst, uint16_t val)
+{
+	return __atomic_exchange_2(dst, val, __ATOMIC_SEQ_CST);
+}
+
 /*------------------------- 32 bit atomic operations -------------------------*/
 
 static inline int
@@ -233,6 +239,13 @@ static inline int rte_atomic32_dec_and_test(rte_atomic32_t *v)
 
 	return ret == 0;
 }
+
+static inline uint32_t
+rte_atomic32_exchange(volatile uint32_t *dst, uint32_t val)
+{
+	return __atomic_exchange_4(dst, val, __ATOMIC_SEQ_CST);
+}
+
 /*------------------------- 64 bit atomic operations -------------------------*/
 
 static inline int
@@ -427,7 +440,6 @@ static inline int rte_atomic64_test_and_set(rte_atomic64_t *v)
 {
 	return rte_atomic64_cmpset((volatile uint64_t *)&v->cnt, 0, 1);
 }
-
 /**
  * Atomically set a 64-bit counter to 0.
  *
@@ -438,6 +450,13 @@ static inline void rte_atomic64_clear(rte_atomic64_t *v)
 {
 	v->cnt = 0;
 }
+
+static inline uint64_t
+rte_atomic64_exchange(volatile uint64_t *dst, uint64_t val)
+{
+	return __atomic_exchange_4(dst, val, __ATOMIC_SEQ_CST);
+}
+
 #endif
 
 #ifdef __cplusplus
diff --git a/lib/librte_eal/common/include/arch/x86/rte_atomic.h b/lib/librte_eal/common/include/arch/x86/rte_atomic.h
index 36cfabc38f09..55bfc3903cdc 100644
--- a/lib/librte_eal/common/include/arch/x86/rte_atomic.h
+++ b/lib/librte_eal/common/include/arch/x86/rte_atomic.h
@@ -60,6 +60,18 @@ rte_atomic16_cmpset(volatile uint16_t *dst, uint16_t exp, uint16_t src)
 	return res;
 }
 
+static inline uint16_t
+rte_atomic16_exchange(volatile uint16_t *dst, uint16_t val)
+{
+	asm volatile(
+			MPLOCKED
+			"xchgw %0, %1;"
+			: "=r" (val), "=m" (*dst)
+			: "0" (val),  "m" (*dst)
+			: "memory");         /* no-clobber list */
+	return val;
+}
+
 static inline int rte_atomic16_test_and_set(rte_atomic16_t *v)
 {
 	return rte_atomic16_cmpset((volatile uint16_t *)&v->cnt, 0, 1);
@@ -134,6 +146,18 @@ rte_atomic32_cmpset(volatile uint32_t *dst, uint32_t exp, uint32_t src)
 	return res;
 }
 
+static inline uint32_t
+rte_atomic32_exchange(volatile uint32_t *dst, uint32_t val)
+{
+	asm volatile(
+			MPLOCKED
+			"xchgl %0, %1;"
+			: "=r" (val), "=m" (*dst)
+			: "0" (val),  "m" (*dst)
+			: "memory");         /* no-clobber list */
+	return val;
+}
+
 static inline int rte_atomic32_test_and_set(rte_atomic32_t *v)
 {
 	return rte_atomic32_cmpset((volatile uint32_t *)&v->cnt, 0, 1);
diff --git a/lib/librte_eal/common/include/arch/x86/rte_atomic_32.h b/lib/librte_eal/common/include/arch/x86/rte_atomic_32.h
index fb3abf187998..8d711b6f685d 100644
--- a/lib/librte_eal/common/include/arch/x86/rte_atomic_32.h
+++ b/lib/librte_eal/common/include/arch/x86/rte_atomic_32.h
@@ -98,6 +98,18 @@ rte_atomic64_cmpset(volatile uint64_t *dst, uint64_t exp, uint64_t src)
 	return res;
 }
 
+static inline uint64_t
+rte_atomic64_exchange(volatile uint64_t *dest, uint64_t val)
+{
+	uint64_t old;
+
+	do {
+		old = *dest;
+	} while (rte_atomic64_cmpset(dest, old, val));
+
+	return old;
+}
+
 static inline void
 rte_atomic64_init(rte_atomic64_t *v)
 {
diff --git a/lib/librte_eal/common/include/arch/x86/rte_atomic_64.h b/lib/librte_eal/common/include/arch/x86/rte_atomic_64.h
index 1a53a766bd72..fd2ec9c53796 100644
--- a/lib/librte_eal/common/include/arch/x86/rte_atomic_64.h
+++ b/lib/librte_eal/common/include/arch/x86/rte_atomic_64.h
@@ -71,6 +71,18 @@ rte_atomic64_cmpset(volatile uint64_t *dst, uint64_t exp, uint64_t src)
 	return res;
 }
 
+static inline uint64_t
+rte_atomic64_exchange(volatile uint64_t *dst, uint64_t val)
+{
+	asm volatile(
+			MPLOCKED
+			"xchgq %0, %1;"
+			: "=r" (val), "=m" (*dst)
+			: "0" (val),  "m" (*dst)
+			: "memory");         /* no-clobber list */
+	return val;
+}
+
 static inline void
 rte_atomic64_init(rte_atomic64_t *v)
 {
diff --git a/lib/librte_eal/common/include/generic/rte_atomic.h b/lib/librte_eal/common/include/generic/rte_atomic.h
index 3ba7245a3e17..bf12162d02f4 100644
--- a/lib/librte_eal/common/include/generic/rte_atomic.h
+++ b/lib/librte_eal/common/include/generic/rte_atomic.h
@@ -139,6 +139,32 @@ rte_atomic16_cmpset(volatile uint16_t *dst, uint16_t exp, uint16_t src)
 }
 #endif
 
+/**
+ * Atomic exchange.
+ *
+ * (atomic) equivalent to:
+ *   ret = *dst
+ *   *dst = val;
+ *   return ret;
+ *
+ * @param dst
+ *   The destination location into which the value will be written.
+ * @param val
+ *   The new value.
+ * @return
+ *   The original value at that location
+ */
+static inline uint16_t
+rte_atomic16_exchange(volatile uint16_t *dst, uint16_t val);
+
+#ifdef RTE_FORCE_INTRINSICS
+static inline uint16_t
+rte_atomic16_exchange(volatile uint16_t *dst, uint16_t val)
+{
+	return __atomic_exchange_2(dst, val, __ATOMIC_SEQ_CST);
+}
+#endif
+
 /**
  * The atomic counter structure.
  */
@@ -392,6 +418,32 @@ rte_atomic32_cmpset(volatile uint32_t *dst, uint32_t exp, uint32_t src)
 }
 #endif
 
+/**
+ * Atomic exchange.
+ *
+ * (atomic) equivalent to:
+ *   ret = *dst
+ *   *dst = val;
+ *   return ret;
+ *
+ * @param dst
+ *   The destination location into which the value will be written.
+ * @param val
+ *   The new value.
+ * @return
+ *   The original value at that location
+ */
+static inline uint32_t
+rte_atomic32_exchange(volatile uint32_t *dst, uint32_t val);
+
+#ifdef RTE_FORCE_INTRINSICS
+static inline uint32_t
+rte_atomic32_exchange(volatile uint32_t *dst, uint32_t val)
+{
+	return __atomic_exchange_4(dst, val, __ATOMIC_SEQ_CST);
+}
+#endif
+
 /**
  * The atomic counter structure.
  */
@@ -644,6 +696,32 @@ rte_atomic64_cmpset(volatile uint64_t *dst, uint64_t exp, uint64_t src)
 }
 #endif
 
+/**
+ * Atomic exchange.
+ *
+ * (atomic) equivalent to:
+ *   ret = *dst
+ *   *dst = val;
+ *   return ret;
+ *
+ * @param dst
+ *   The destination location into which the value will be written.
+ * @param val
+ *   The new value.
+ * @return
+ *   The original value at that location
+ */
+static inline uint64_t
+rte_atomic64_exchange(volatile uint64_t *dst, uint64_t val);
+
+#ifdef RTE_FORCE_INTRINSICS
+static inline uint64_t
+rte_atomic64_exchange(volatile uint64_t *dst, uint64_t val)
+{
+	return __atomic_exchange_8(dst, val, __ATOMIC_SEQ_CST);
+}
+#endif
+
 /**
  * The atomic counter structure.
  */
-- 
2.15.1

[PATCH v8 02/15] ethdev: add linkstatus get/set helper functions

[Stephen Hemminger]

Many drivers are all doing copy/paste of the same code to atomically
update the link status. Reduce duplication, and allow for future
changes by having common function for this.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 lib/librte_ether/rte_ethdev.c        | 22 +++----------
 lib/librte_ether/rte_ethdev_driver.h | 63 ++++++++++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+), 18 deletions(-)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index f285ba278967..344397101abd 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1578,20 +1578,6 @@ rte_eth_allmulticast_get(uint16_t port_id)
 	return dev->data->all_multicast;
 }
 
-static inline int
-rte_eth_dev_atomic_read_link_status(struct rte_eth_dev *dev,
-				struct rte_eth_link *link)
-{
-	struct rte_eth_link *dst = link;
-	struct rte_eth_link *src = &(dev->data->dev_link);
-
-	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
-					*(uint64_t *)src) == 0)
-		return -1;
-
-	return 0;
-}
-
 void
 rte_eth_link_get(uint16_t port_id, struct rte_eth_link *eth_link)
 {
@@ -1600,8 +1586,8 @@ rte_eth_link_get(uint16_t port_id, struct rte_eth_link *eth_link)
 	RTE_ETH_VALID_PORTID_OR_RET(port_id);
 	dev = &rte_eth_devices[port_id];
 
-	if (dev->data->dev_conf.intr_conf.lsc != 0)
-		rte_eth_dev_atomic_read_link_status(dev, eth_link);
+	if (dev->data->dev_conf.intr_conf.lsc)
+		rte_eth_linkstatus_get(dev, eth_link);
 	else {
 		RTE_FUNC_PTR_OR_RET(*dev->dev_ops->link_update);
 		(*dev->dev_ops->link_update)(dev, 1);
@@ -1617,8 +1603,8 @@ rte_eth_link_get_nowait(uint16_t port_id, struct rte_eth_link *eth_link)
 	RTE_ETH_VALID_PORTID_OR_RET(port_id);
 	dev = &rte_eth_devices[port_id];
 
-	if (dev->data->dev_conf.intr_conf.lsc != 0)
-		rte_eth_dev_atomic_read_link_status(dev, eth_link);
+	if (dev->data->dev_conf.intr_conf.lsc)
+		rte_eth_linkstatus_get(dev, eth_link);
 	else {
 		RTE_FUNC_PTR_OR_RET(*dev->dev_ops->link_update);
 		(*dev->dev_ops->link_update)(dev, 0);
diff --git a/lib/librte_ether/rte_ethdev_driver.h b/lib/librte_ether/rte_ethdev_driver.h
index 45f08c65ec1e..fd3e1c0bd21f 100644
--- a/lib/librte_ether/rte_ethdev_driver.h
+++ b/lib/librte_ether/rte_ethdev_driver.h
@@ -68,6 +68,69 @@ struct rte_eth_dev *rte_eth_dev_attach_secondary(const char *name);
  */
 int rte_eth_dev_release_port(struct rte_eth_dev *eth_dev);
 
+/**
+ * @internal
+ * Atomically set the link status for the specific device.
+ * It is for use by DPDK device driver use only.
+ * User applications should not call it
+ *
+ * @param dev
+ *  Pointer to struct rte_eth_dev.
+ * @param link
+ *  New link status value.
+ * @return
+ *  Same convention as eth_link_update operation.
+ *  0   if link up status has changed
+ *  -1  if link up status was unchanged
+ */
+static inline int
+rte_eth_linkstatus_set(struct rte_eth_dev *dev,
+		       const struct rte_eth_link *new_link)
+{
+	volatile uint64_t *dev_link
+		 = (volatile uint64_t *)&(dev->data->dev_link);
+	union {
+		uint64_t val64;
+		struct rte_eth_link link;
+	} orig;
+
+	RTE_BUILD_BUG_ON(sizeof(*new_link) != sizeof(uint64_t));
+
+	orig.val64 = rte_atomic64_exchange(dev_link,
+					   *(const uint64_t *)new_link);
+
+	return (orig.link.link_status == new_link->link_status) ? -1 : 0;
+}
+
+/**
+ * @internal
+ * Atomically get the link speed and status.
+ *
+ * @param dev
+ *  Pointer to struct rte_eth_dev.
+ * @param link
+ *  link status value.
+ */
+static inline void
+rte_eth_linkstatus_get(const struct rte_eth_dev *dev,
+		       struct rte_eth_link *link)
+{
+	volatile uint64_t *src = (uint64_t *)&(dev->data->dev_link);
+	uint64_t *dst = (uint64_t *)link;
+
+	RTE_BUILD_BUG_ON(sizeof(*link) != sizeof(uint64_t));
+
+#ifdef __LP64__
+	/* if cpu arch has 64 bit unsigned lon then implicitly atomic */
+	*dst = *src;
+#else
+	/* can't use rte_atomic64_read because it returns signed int */
+	do {
+		*dst = *src;
+	} while (!rte_atomic64_cmpset(src, *dst, *dst));
+#endif
+}
+
 /**
  * @internal
  * Release device queues and clear its configuration to force the user
-- 
2.15.1

[PATCH v8 03/15] net/virtio: use eth_linkstatus_set

[Stephen Hemminger]

Use the new comon code in ethdev to handle link status update.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/virtio/virtio_ethdev.c | 52 ++++----------------------------------
 1 file changed, 5 insertions(+), 47 deletions(-)

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 65cb71fa65cc..fbba2db594fe 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -14,7 +14,6 @@
 #include <rte_string_fns.h>
 #include <rte_memzone.h>
 #include <rte_malloc.h>
-#include <rte_atomic.h>
 #include <rte_branch_prediction.h>
 #include <rte_pci.h>
 #include <rte_bus_pci.h>
@@ -785,46 +784,6 @@ static const struct eth_dev_ops virtio_eth_dev_ops = {
 	.mac_addr_set            = virtio_mac_addr_set,
 };
 
-static inline int
-virtio_dev_atomic_read_link_status(struct rte_eth_dev *dev,
-				struct rte_eth_link *link)
-{
-	struct rte_eth_link *dst = link;
-	struct rte_eth_link *src = &(dev->data->dev_link);
-
-	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
-			*(uint64_t *)src) == 0)
-		return -1;
-
-	return 0;
-}
-
-/**
- * Atomically writes the link status information into global
- * structure rte_eth_dev.
- *
- * @param dev
- *   - Pointer to the structure rte_eth_dev to read from.
- *   - Pointer to the buffer to be saved with the link status.
- *
- * @return
- *   - On success, zero.
- *   - On failure, negative value.
- */
-static inline int
-virtio_dev_atomic_write_link_status(struct rte_eth_dev *dev,
-		struct rte_eth_link *link)
-{
-	struct rte_eth_link *dst = &(dev->data->dev_link);
-	struct rte_eth_link *src = link;
-
-	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
-					*(uint64_t *)src) == 0)
-		return -1;
-
-	return 0;
-}
-
 static void
 virtio_update_stats(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
 {
@@ -2034,21 +1993,21 @@ virtio_dev_stop(struct rte_eth_dev *dev)
 
 	hw->started = 0;
 	memset(&link, 0, sizeof(link));
-	virtio_dev_atomic_write_link_status(dev, &link);
+	rte_eth_linkstatus_set(dev, &link);
 	rte_spinlock_unlock(&hw->state_lock);
 }
 
 static int
 virtio_dev_link_update(struct rte_eth_dev *dev, __rte_unused int wait_to_complete)
 {
-	struct rte_eth_link link, old;
+	struct rte_eth_link link;
 	uint16_t status;
 	struct virtio_hw *hw = dev->data->dev_private;
+
 	memset(&link, 0, sizeof(link));
-	virtio_dev_atomic_read_link_status(dev, &link);
-	old = link;
 	link.link_duplex = ETH_LINK_FULL_DUPLEX;
 	link.link_speed  = ETH_SPEED_NUM_10G;
+	link.link_autoneg = ETH_LINK_SPEED_FIXED;
 
 	if (hw->started == 0) {
 		link.link_status = ETH_LINK_DOWN;
@@ -2069,9 +2028,8 @@ virtio_dev_link_update(struct rte_eth_dev *dev, __rte_unused int wait_to_complet
 	} else {
 		link.link_status = ETH_LINK_UP;
 	}
-	virtio_dev_atomic_write_link_status(dev, &link);
 
-	return (old.link_status == link.link_status) ? -1 : 0;
+	return rte_eth_linkstatus_set(dev, &link);
 }
 
 static int
-- 
2.15.1

[PATCH v8 04/15] net/vmxnet3: use rte_eth_linkstatus_set

[Stephen Hemminger]

Use new rte_eth_link_update helper.
Also remove no longer necessary include of rte_atomic.h

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/vmxnet3/vmxnet3_ethdev.c | 63 ++----------------------------------
 1 file changed, 3 insertions(+), 60 deletions(-)

diff --git a/drivers/net/vmxnet3/vmxnet3_ethdev.c b/drivers/net/vmxnet3/vmxnet3_ethdev.c
index a2fb93cc984c..598dc344047d 100644
--- a/drivers/net/vmxnet3/vmxnet3_ethdev.c
+++ b/drivers/net/vmxnet3/vmxnet3_ethdev.c
@@ -20,7 +20,6 @@
 #include <rte_debug.h>
 #include <rte_pci.h>
 #include <rte_bus_pci.h>
-#include <rte_atomic.h>
 #include <rte_branch_prediction.h>
 #include <rte_memory.h>
 #include <rte_memzone.h>
@@ -160,59 +159,6 @@ gpa_zone_reserve(struct rte_eth_dev *dev, uint32_t size,
 	return rte_memzone_reserve_aligned(z_name, size, socket_id, 0, align);
 }
 
-/**
- * Atomically reads the link status information from global
- * structure rte_eth_dev.
- *
- * @param dev
- *   - Pointer to the structure rte_eth_dev to read from.
- *   - Pointer to the buffer to be saved with the link status.
- *
- * @return
- *   - On success, zero.
- *   - On failure, negative value.
- */
-
-static int
-vmxnet3_dev_atomic_read_link_status(struct rte_eth_dev *dev,
-				    struct rte_eth_link *link)
-{
-	struct rte_eth_link *dst = link;
-	struct rte_eth_link *src = &(dev->data->dev_link);
-
-	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
-				*(uint64_t *)src) == 0)
-		return -1;
-
-	return 0;
-}
-
-/**
- * Atomically writes the link status information into global
- * structure rte_eth_dev.
- *
- * @param dev
- *   - Pointer to the structure rte_eth_dev to write to.
- *   - Pointer to the buffer to be saved with the link status.
- *
- * @return
- *   - On success, zero.
- *   - On failure, negative value.
- */
-static int
-vmxnet3_dev_atomic_write_link_status(struct rte_eth_dev *dev,
-				     struct rte_eth_link *link)
-{
-	struct rte_eth_link *dst = &(dev->data->dev_link);
-	struct rte_eth_link *src = link;
-
-	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
-				*(uint64_t *)src) == 0)
-		return -1;
-
-	return 0;
-}
-
 /*
  * This function is based on vmxnet3_disable_intr()
  */
@@ -853,7 +799,7 @@ vmxnet3_dev_stop(struct rte_eth_dev *dev)
 
 	/* Clear recorded link status */
 	memset(&link, 0, sizeof(link));
-	vmxnet3_dev_atomic_write_link_status(dev, &link);
+	rte_eth_linkstatus_set(dev, &link);
 }
 
 /*
@@ -1132,11 +1078,10 @@ __vmxnet3_dev_link_update(struct rte_eth_dev *dev,
 			  __rte_unused int wait_to_complete)
 {
 	struct vmxnet3_hw *hw = dev->data->dev_private;
-	struct rte_eth_link old = { 0 }, link;
+	struct rte_eth_link link;
 	uint32_t ret;
 
 	memset(&link, 0, sizeof(link));
-	vmxnet3_dev_atomic_read_link_status(dev, &old);
 
 	VMXNET3_WRITE_BAR1_REG(hw, VMXNET3_REG_CMD, VMXNET3_CMD_GET_LINK);
 	ret = VMXNET3_READ_BAR1_REG(hw, VMXNET3_REG_CMD);
@@ -1148,9 +1093,7 @@ __vmxnet3_dev_link_update(struct rte_eth_dev *dev,
 		link.link_autoneg = ETH_LINK_AUTONEG;
 	}
 
-	vmxnet3_dev_atomic_write_link_status(dev, &link);
-
-	return (old.link_status == link.link_status) ? -1 : 0;
+	return rte_eth_linkstatus_set(dev, &link);
 }
 
 static int
-- 
2.15.1

[PATCH v8 05/15] net/dpaa2: use rte_eth_linkstatus_set

[Stephen Hemminger]

Use new helper function to update the link status.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/dpaa2/dpaa2_ethdev.c | 78 ++++++----------------------------------
 1 file changed, 10 insertions(+), 68 deletions(-)

diff --git a/drivers/net/dpaa2/dpaa2_ethdev.c b/drivers/net/dpaa2/dpaa2_ethdev.c
index 09a11d65af93..6778fc97fdd6 100644
--- a/drivers/net/dpaa2/dpaa2_ethdev.c
+++ b/drivers/net/dpaa2/dpaa2_ethdev.c
@@ -57,58 +57,6 @@ static int dpaa2_dev_set_link_up(struct rte_eth_dev *dev);
 static int dpaa2_dev_set_link_down(struct rte_eth_dev *dev);
 static int dpaa2_dev_mtu_set(struct rte_eth_dev *dev, uint16_t mtu);
 
-/**
- * Atomically reads the link status information from global
- * structure rte_eth_dev.
- *
- * @param dev
- *   - Pointer to the structure rte_eth_dev to read from.
- *   - Pointer to the buffer to be saved with the link status.
- *
- * @return
- *   - On success, zero.
- *   - On failure, negative value.
- */
-static inline int
-dpaa2_dev_atomic_read_link_status(struct rte_eth_dev *dev,
-				  struct rte_eth_link *link)
-{
-	struct rte_eth_link *dst = link;
-	struct rte_eth_link *src = &dev->data->dev_link;
-
-	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
-				*(uint64_t *)src) == 0)
-		return -1;
-
-	return 0;
-}
-
-/**
- * Atomically writes the link status information into global
- * structure rte_eth_dev.
- *
- * @param dev
- *   - Pointer to the structure rte_eth_dev to read from.
- *   - Pointer to the buffer to be saved with the link status.
- *
- * @return
- *   - On success, zero.
- *   - On failure, negative value.
- */
-static inline int
-dpaa2_dev_atomic_write_link_status(struct rte_eth_dev *dev,
-				   struct rte_eth_link *link)
-{
-	struct rte_eth_link *dst = &dev->data->dev_link;
-	struct rte_eth_link *src = link;
-
-	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
-				*(uint64_t *)src) == 0)
-		return -1;
-
-	return 0;
-}
-
 static int
 dpaa2_vlan_filter_set(struct rte_eth_dev *dev, uint16_t vlan_id, int on)
 {
@@ -852,7 +800,7 @@ dpaa2_dev_stop(struct rte_eth_dev *dev)
 
 	/* clear the recorded link status */
 	memset(&link, 0, sizeof(link));
-	dpaa2_dev_atomic_write_link_status(dev, &link);
+	rte_eth_linkstatus_set(dev, &link);
 }
 
 static void
@@ -884,7 +832,7 @@ dpaa2_dev_close(struct rte_eth_dev *dev)
 	}
 
 	memset(&link, 0, sizeof(link));
-	dpaa2_dev_atomic_write_link_status(dev, &link);
+	rte_eth_linkstatus_set(dev, &link);
 }
 
 static void
@@ -1335,15 +1283,13 @@ dpaa2_dev_link_update(struct rte_eth_dev *dev,
 	int ret;
 	struct dpaa2_dev_priv *priv = dev->data->dev_private;
 	struct fsl_mc_io *dpni = (struct fsl_mc_io *)priv->hw;
-	struct rte_eth_link link, old;
+	struct rte_eth_link link;
 	struct dpni_link_state state = {0};
 
 	if (dpni == NULL) {
 		RTE_LOG(ERR, PMD, "dpni is NULL\n");
 		return 0;
 	}
-	memset(&old, 0, sizeof(old));
-	dpaa2_dev_atomic_read_link_status(dev, &old);
 
 	ret = dpni_get_link_state(dpni, CMD_PRI_LOW, priv->token, &state);
 	if (ret < 0) {
@@ -1351,11 +1297,6 @@ dpaa2_dev_link_update(struct rte_eth_dev *dev,
 		return -1;
 	}
 
-	if ((old.link_status == state.up) && (old.link_speed == state.rate)) {
-		RTE_LOG(DEBUG, PMD, "No change in status\n");
-		return -1;
-	}
-
 	memset(&link, 0, sizeof(struct rte_eth_link));
 	link.link_status = state.up;
 	link.link_speed = state.rate;
@@ -1365,13 +1306,14 @@ dpaa2_dev_link_update(struct rte_eth_dev *dev,
 	else
 		link.link_duplex = ETH_LINK_FULL_DUPLEX;
 
-	dpaa2_dev_atomic_write_link_status(dev, &link);
-
-	if (link.link_status)
-		PMD_DRV_LOG(INFO, "Port %d Link is Up\n", dev->data->port_id);
+	ret = rte_eth_linkstatus_set(dev, &link);
+	if (ret == -1)
+		RTE_LOG(DEBUG, PMD, "No change in status\n");
 	else
-		PMD_DRV_LOG(INFO, "Port %d Link is Down", dev->data->port_id);
-	return 0;
+		PMD_DRV_LOG(INFO, "Port %d Link is %s\n", dev->data->port_id,
+			    link.link_status ? "Up" : "Down");
+
+	return ret;
 }
 
 /**
-- 
2.15.1

[PATCH v8 06/15] net/nfp: use rte_eth_linkstatus functions

[Stephen Hemminger]

Use new rte_eth_linkstatus_get/set helper function.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/nfp/nfp_net.c | 72 +++++------------------------------------------
 1 file changed, 7 insertions(+), 65 deletions(-)

diff --git a/drivers/net/nfp/nfp_net.c b/drivers/net/nfp/nfp_net.c
index 0044699237ac..d1ba1a117409 100644
--- a/drivers/net/nfp/nfp_net.c
+++ b/drivers/net/nfp/nfp_net.c
@@ -213,57 +213,6 @@ nn_cfg_writeq(struct nfp_net_hw *hw, int off, uint64_t val)
 	nn_writeq(rte_cpu_to_le_64(val), hw->ctrl_bar + off);
 }
 
-/*
- * Atomically reads link status information from global structure rte_eth_dev.
- *
- * @param dev
- *   - Pointer to the structure rte_eth_dev to read from.
- *   - Pointer to the buffer to be saved with the link status.
- *
- * @return
- *   - On success, zero.
- *   - On failure, negative value.
- */
-static inline int
-nfp_net_dev_atomic_read_link_status(struct rte_eth_dev *dev,
-				    struct rte_eth_link *link)
-{
-	struct rte_eth_link *dst = link;
-	struct rte_eth_link *src = &dev->data->dev_link;
-
-	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
-				*(uint64_t *)src) == 0)
-		return -1;
-
-	return 0;
-}
-
-/*
- * Atomically writes the link status information into global
- * structure rte_eth_dev.
- *
- * @param dev
- *   - Pointer to the structure rte_eth_dev to read from.
- *   - Pointer to the buffer to be saved with the link status.
- *
- * @return
- *   - On success, zero.
- *   - On failure, negative value.
- */
-static inline int
-nfp_net_dev_atomic_write_link_status(struct rte_eth_dev *dev,
-				     struct rte_eth_link *link)
-{
-	struct rte_eth_link *dst = &dev->data->dev_link;
-	struct rte_eth_link *src = link;
-
-	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
-				*(uint64_t *)src) == 0)
-		return -1;
-
-	return 0;
-}
-
 static void
 nfp_net_rx_queue_release_mbufs(struct nfp_net_rxq *rxq)
 {
@@ -999,8 +948,9 @@ static int
 nfp_net_link_update(struct rte_eth_dev *dev, __rte_unused int wait_to_complete)
 {
 	struct nfp_net_hw *hw;
-	struct rte_eth_link link, old;
+	struct rte_eth_link link;
 	uint32_t nn_link_status;
+	int ret;
 
 	static const uint32_t ls_to_ethtool[] = {
 		[NFP_NET_CFG_STS_LINK_RATE_UNSUPPORTED] = ETH_SPEED_NUM_NONE,
@@ -1017,9 +967,6 @@ nfp_net_link_update(struct rte_eth_dev *dev, __rte_unused int wait_to_complete)
 
 	hw = NFP_NET_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 
-	memset(&old, 0, sizeof(old));
-	nfp_net_dev_atomic_read_link_status(dev, &old);
-
 	nn_link_status = nn_cfg_readl(hw, NFP_NET_CFG_STS);
 
 	memset(&link, 0, sizeof(struct rte_eth_link));
@@ -1037,16 +984,14 @@ nfp_net_link_update(struct rte_eth_dev *dev, __rte_unused int wait_to_complete)
 	else
 		link.link_speed = ls_to_ethtool[nn_link_status];
 
-	if (old.link_status != link.link_status) {
-		nfp_net_dev_atomic_write_link_status(dev, &link);
+	ret = rte_eth_linkstatus_set(dev, &link);
+	if (ret == 0) {
 		if (link.link_status)
 			PMD_DRV_LOG(INFO, "NIC Link is Up\n");
 		else
 			PMD_DRV_LOG(INFO, "NIC Link is Down\n");
-		return 0;
 	}
-
-	return -1;
+	return ret;
 }
 
 static int
@@ -1376,8 +1321,7 @@ nfp_net_dev_link_status_print(struct rte_eth_dev *dev)
 	struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(dev);
 	struct rte_eth_link link;
 
-	memset(&link, 0, sizeof(link));
-	nfp_net_dev_atomic_read_link_status(dev, &link);
+	rte_eth_linkstatus_get(dev, &link);
 	if (link.link_status)
 		RTE_LOG(INFO, PMD, "Port %d: Link Up - speed %u Mbps - %s\n",
 			dev->data->port_id, link.link_speed,
@@ -1430,9 +1374,7 @@ nfp_net_dev_interrupt_handler(void *param)
 
 	PMD_DRV_LOG(DEBUG, "We got a LSC interrupt!!!\n");
 
-	/* get the link status */
-	memset(&link, 0, sizeof(link));
-	nfp_net_dev_atomic_read_link_status(dev, &link);
+	rte_eth_linkstatus_get(dev, &link);
 
 	nfp_net_link_update(dev, 0);
 
-- 
2.15.1

[PATCH v8 07/15] net/e1000: use rte_eth_linkstatus helpers

[Stephen Hemminger]

Use new rte_eth_linkstatus_get/set API.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/e1000/em_ethdev.c  | 70 +++--------------------------------------
 drivers/net/e1000/igb_ethdev.c | 71 +++---------------------------------------
 2 files changed, 10 insertions(+), 131 deletions(-)

diff --git a/drivers/net/e1000/em_ethdev.c b/drivers/net/e1000/em_ethdev.c
index 07ee25f84f09..3a53846e14b5 100644
--- a/drivers/net/e1000/em_ethdev.c
+++ b/drivers/net/e1000/em_ethdev.c
@@ -20,7 +20,6 @@
 #include <rte_ethdev_pci.h>
 #include <rte_memory.h>
 #include <rte_eal.h>
-#include <rte_atomic.h>
 #include <rte_malloc.h>
 #include <rte_dev.h>
 
@@ -197,57 +196,6 @@ static const struct eth_dev_ops eth_em_ops = {
 	.txq_info_get         = em_txq_info_get,
 };
 
-/**
- * Atomically reads the link status information from global
- * structure rte_eth_dev.
- *
- * @param dev
- *   - Pointer to the structure rte_eth_dev to read from.
- *   - Pointer to the buffer to be saved with the link status.
- *
- * @return
- *   - On success, zero.
- *   - On failure, negative value.
- */
-static inline int
-rte_em_dev_atomic_read_link_status(struct rte_eth_dev *dev,
-				struct rte_eth_link *link)
-{
-	struct rte_eth_link *dst = link;
-	struct rte_eth_link *src = &(dev->data->dev_link);
-
-	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
-					*(uint64_t *)src) == 0)
-		return -1;
-
-	return 0;
-}
-
-/**
- * Atomically writes the link status information into global
- * structure rte_eth_dev.
- *
- * @param dev
- *   - Pointer to the structure rte_eth_dev to read from.
- *   - Pointer to the buffer to be saved with the link status.
- *
- * @return
- *   - On success, zero.
- *   - On failure, negative value.
- */
-static inline int
-rte_em_dev_atomic_write_link_status(struct rte_eth_dev *dev,
-				struct rte_eth_link *link)
-{
-	struct rte_eth_link *dst = &(dev->data->dev_link);
-	struct rte_eth_link *src = link;
-
-	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
-					*(uint64_t *)src) == 0)
-		return -1;
-
-	return 0;
-}
 
 /**
  *  eth_em_dev_is_ich8 - Check for ICH8 device
@@ -802,7 +750,7 @@ eth_em_stop(struct rte_eth_dev *dev)
 
 	/* clear the recorded link status */
 	memset(&link, 0, sizeof(link));
-	rte_em_dev_atomic_write_link_status(dev, &link);
+	rte_eth_linkstatus_set(dev, &link);
 
 	if (!rte_intr_allow_others(intr_handle))
 		/* resume to the default handler */
@@ -1160,7 +1108,7 @@ eth_em_link_update(struct rte_eth_dev *dev, int wait_to_complete)
 {
 	struct e1000_hw *hw =
 		E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
-	struct rte_eth_link link, old;
+	struct rte_eth_link link;
 	int link_check, count;
 
 	link_check = 0;
@@ -1195,8 +1143,6 @@ eth_em_link_update(struct rte_eth_dev *dev, int wait_to_complete)
 		rte_delay_ms(EM_LINK_UPDATE_CHECK_INTERVAL);
 	}
 	memset(&link, 0, sizeof(link));
-	rte_em_dev_atomic_read_link_status(dev, &link);
-	old = link;
 
 	/* Now we check if a transition has happened */
 	if (link_check && (link.link_status == ETH_LINK_DOWN)) {
@@ -1215,14 +1161,8 @@ eth_em_link_update(struct rte_eth_dev *dev, int wait_to_complete)
 		link.link_status = ETH_LINK_DOWN;
 		link.link_autoneg = ETH_LINK_FIXED;
 	}
-	rte_em_dev_atomic_write_link_status(dev, &link);
-
-	/* not changed */
-	if (old.link_status == link.link_status)
-		return -1;
 
-	/* changed */
-	return 0;
+	return rte_eth_linkstatus_set(dev, &link);
 }
 
 /*
@@ -1631,8 +1571,8 @@ eth_em_interrupt_action(struct rte_eth_dev *dev,
 	if (ret < 0)
 		return 0;
 
-	memset(&link, 0, sizeof(link));
-	rte_em_dev_atomic_read_link_status(dev, &link);
+	rte_eth_linkstatus_get(dev, &link);
+
 	if (link.link_status) {
 		PMD_INIT_LOG(INFO, " Port %d: Link Up - speed %u Mbps - %s",
 			     dev->data->port_id, link.link_speed,
diff --git a/drivers/net/e1000/igb_ethdev.c b/drivers/net/e1000/igb_ethdev.c
index 53b8ffa45fda..5998febd54f5 100644
--- a/drivers/net/e1000/igb_ethdev.c
+++ b/drivers/net/e1000/igb_ethdev.c
@@ -20,7 +20,6 @@
 #include <rte_ethdev_pci.h>
 #include <rte_memory.h>
 #include <rte_eal.h>
-#include <rte_atomic.h>
 #include <rte_malloc.h>
 #include <rte_dev.h>
 
@@ -522,57 +521,6 @@ static const struct rte_igb_xstats_name_off rte_igbvf_stats_strings[] = {
 #define IGBVF_NB_XSTATS (sizeof(rte_igbvf_stats_strings) / \
 		sizeof(rte_igbvf_stats_strings[0]))
 
-/**
- * Atomically reads the link status information from global
- * structure rte_eth_dev.
- *
- * @param dev
- *   - Pointer to the structure rte_eth_dev to read from.
- *   - Pointer to the buffer to be saved with the link status.
- *
- * @return
- *   - On success, zero.
- *   - On failure, negative value.
- */
-static inline int
-rte_igb_dev_atomic_read_link_status(struct rte_eth_dev *dev,
-				struct rte_eth_link *link)
-{
-	struct rte_eth_link *dst = link;
-	struct rte_eth_link *src = &(dev->data->dev_link);
-
-	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
-					*(uint64_t *)src) == 0)
-		return -1;
-
-	return 0;
-}
-
-/**
- * Atomically writes the link status information into global
- * structure rte_eth_dev.
- *
- * @param dev
- *   - Pointer to the structure rte_eth_dev to read from.
- *   - Pointer to the buffer to be saved with the link status.
- *
- * @return
- *   - On success, zero.
- *   - On failure, negative value.
- */
-static inline int
-rte_igb_dev_atomic_write_link_status(struct rte_eth_dev *dev,
-				struct rte_eth_link *link)
-{
-	struct rte_eth_link *dst = &(dev->data->dev_link);
-	struct rte_eth_link *src = link;
-
-	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
-					*(uint64_t *)src) == 0)
-		return -1;
-
-	return 0;
-}
 
 static inline void
 igb_intr_enable(struct rte_eth_dev *dev)
@@ -1559,7 +1507,7 @@ eth_igb_stop(struct rte_eth_dev *dev)
 
 	/* clear the recorded link status */
 	memset(&link, 0, sizeof(link));
-	rte_igb_dev_atomic_write_link_status(dev, &link);
+	rte_eth_linkstatus_set(dev, &link);
 
 	if (!rte_intr_allow_others(intr_handle))
 		/* resume to the default handler */
@@ -1635,7 +1583,7 @@ eth_igb_close(struct rte_eth_dev *dev)
 	}
 
 	memset(&link, 0, sizeof(link));
-	rte_igb_dev_atomic_write_link_status(dev, &link);
+	rte_eth_linkstatus_set(dev, &link);
 }
 
 static int
@@ -2382,7 +2330,7 @@ eth_igb_link_update(struct rte_eth_dev *dev, int wait_to_complete)
 {
 	struct e1000_hw *hw =
 		E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
-	struct rte_eth_link link, old;
+	struct rte_eth_link link;
 	int link_check, count;
 
 	link_check = 0;
@@ -2423,8 +2371,6 @@ eth_igb_link_update(struct rte_eth_dev *dev, int wait_to_complete)
 		rte_delay_ms(IGB_LINK_UPDATE_CHECK_INTERVAL);
 	}
 	memset(&link, 0, sizeof(link));
-	rte_igb_dev_atomic_read_link_status(dev, &link);
-	old = link;
 
 	/* Now we check if a transition has happened */
 	if (link_check) {
@@ -2443,14 +2389,8 @@ eth_igb_link_update(struct rte_eth_dev *dev, int wait_to_complete)
 		link.link_status = ETH_LINK_DOWN;
 		link.link_autoneg = ETH_LINK_FIXED;
 	}
-	rte_igb_dev_atomic_write_link_status(dev, &link);
 
-	/* not changed */
-	if (old.link_status == link.link_status)
-		return -1;
-
-	/* changed */
-	return 0;
+	return rte_eth_linkstatus_set(dev, &link);
 }
 
 /*
@@ -2887,8 +2827,7 @@ eth_igb_interrupt_action(struct rte_eth_dev *dev,
 		if (ret < 0)
 			return 0;
 
-		memset(&link, 0, sizeof(link));
-		rte_igb_dev_atomic_read_link_status(dev, &link);
+		rte_eth_linkstatus_get(dev, &link);
 		if (link.link_status) {
 			PMD_INIT_LOG(INFO,
 				     " Port %d: Link Up - speed %u Mbps - %s",
-- 
2.15.1

[PATCH v8 08/15] net/ixgbe: use rte_eth_linkstatus functions

[Stephen Hemminger]

Use the new helper functions from eth_dev for
handling atomic link_info update.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/ixgbe/ixgbe_ethdev.c | 90 ++++++----------------------------------
 1 file changed, 13 insertions(+), 77 deletions(-)

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 58217680c29c..231a29185e08 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -20,7 +20,6 @@
 #include <rte_debug.h>
 #include <rte_pci.h>
 #include <rte_bus_pci.h>
-#include <rte_atomic.h>
 #include <rte_branch_prediction.h>
 #include <rte_memory.h>
 #include <rte_eal.h>
@@ -787,58 +786,6 @@ static const struct rte_ixgbe_xstats_name_off rte_ixgbevf_stats_strings[] = {
 #define IXGBEVF_NB_XSTATS (sizeof(rte_ixgbevf_stats_strings) /	\
 		sizeof(rte_ixgbevf_stats_strings[0]))
 
-/**
- * Atomically reads the link status information from global
- * structure rte_eth_dev.
- *
- * @param dev
- *   - Pointer to the structure rte_eth_dev to read from.
- *   - Pointer to the buffer to be saved with the link status.
- *
- * @return
- *   - On success, zero.
- *   - On failure, negative value.
- */
-static inline int
-rte_ixgbe_dev_atomic_read_link_status(struct rte_eth_dev *dev,
-				struct rte_eth_link *link)
-{
-	struct rte_eth_link *dst = link;
-	struct rte_eth_link *src = &(dev->data->dev_link);
-
-	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
-					*(uint64_t *)src) == 0)
-		return -1;
-
-	return 0;
-}
-
-/**
- * Atomically writes the link status information into global
- * structure rte_eth_dev.
- *
- * @param dev
- *   - Pointer to the structure rte_eth_dev to read from.
- *   - Pointer to the buffer to be saved with the link status.
- *
- * @return
- *   - On success, zero.
- *   - On failure, negative value.
- */
-static inline int
-rte_ixgbe_dev_atomic_write_link_status(struct rte_eth_dev *dev,
-				struct rte_eth_link *link)
-{
-	struct rte_eth_link *dst = &(dev->data->dev_link);
-	struct rte_eth_link *src = link;
-
-	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
-					*(uint64_t *)src) == 0)
-		return -1;
-
-	return 0;
-}
-
 /*
  * This function is the same as ixgbe_is_sfp() in base/ixgbe.h.
  */
@@ -2758,7 +2705,7 @@ ixgbe_dev_stop(struct rte_eth_dev *dev)
 
 	/* Clear recorded link status */
 	memset(&link, 0, sizeof(link));
-	rte_ixgbe_dev_atomic_write_link_status(dev, &link);
+	rte_eth_linkstatus_set(dev, &link);
 
 	if (!rte_intr_allow_others(intr_handle))
 		/* resume to the default handler */
@@ -3943,7 +3890,7 @@ ixgbe_dev_link_update_share(struct rte_eth_dev *dev,
 			    int wait_to_complete, int vf)
 {
 	struct ixgbe_hw *hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
-	struct rte_eth_link link, old;
+	struct rte_eth_link link;
 	ixgbe_link_speed link_speed = IXGBE_LINK_SPEED_UNKNOWN;
 	struct ixgbe_interrupt *intr =
 		IXGBE_DEV_PRIVATE_TO_INTR(dev->data->dev_private);
@@ -3953,12 +3900,11 @@ ixgbe_dev_link_update_share(struct rte_eth_dev *dev,
 	int wait = 1;
 	bool autoneg = false;
 
+	memset(&link, 0, sizeof(link));
 	link.link_status = ETH_LINK_DOWN;
 	link.link_speed = 0;
 	link.link_duplex = ETH_LINK_HALF_DUPLEX;
 	link.link_autoneg = ETH_LINK_AUTONEG;
-	memset(&old, 0, sizeof(old));
-	rte_ixgbe_dev_atomic_read_link_status(dev, &old);
 
 	hw->mac.get_link_status = true;
 
@@ -3982,19 +3928,14 @@ ixgbe_dev_link_update_share(struct rte_eth_dev *dev,
 	if (diag != 0) {
 		link.link_speed = ETH_SPEED_NUM_100M;
 		link.link_duplex = ETH_LINK_FULL_DUPLEX;
-		rte_ixgbe_dev_atomic_write_link_status(dev, &link);
-		if (link.link_status == old.link_status)
-			return -1;
-		return 0;
+		return rte_eth_linkstatus_set(dev, &link);
 	}
 
 	if (link_up == 0) {
-		rte_ixgbe_dev_atomic_write_link_status(dev, &link);
 		intr->flags |= IXGBE_FLAG_NEED_LINK_CONFIG;
-		if (link.link_status == old.link_status)
-			return -1;
-		return 0;
+		return rte_eth_linkstatus_set(dev, &link);
 	}
+
 	intr->flags &= ~IXGBE_FLAG_NEED_LINK_CONFIG;
 	link.link_status = ETH_LINK_UP;
 	link.link_duplex = ETH_LINK_FULL_DUPLEX;
@@ -4026,12 +3967,8 @@ ixgbe_dev_link_update_share(struct rte_eth_dev *dev,
 		link.link_speed = ETH_SPEED_NUM_10G;
 		break;
 	}
-	rte_ixgbe_dev_atomic_write_link_status(dev, &link);
 
-	if (link.link_status == old.link_status)
-		return -1;
-
-	return 0;
+	return rte_eth_linkstatus_set(dev, &link);
 }
 
 static int
@@ -4230,8 +4167,8 @@ ixgbe_dev_link_status_print(struct rte_eth_dev *dev)
 	struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(dev);
 	struct rte_eth_link link;
 
-	memset(&link, 0, sizeof(link));
-	rte_ixgbe_dev_atomic_read_link_status(dev, &link);
+	rte_eth_linkstatus_get(dev, &link);
+
 	if (link.link_status) {
 		PMD_INIT_LOG(INFO, "Port %d: Link Up - speed %u Mbps - %s",
 					(int)(dev->data->port_id),
@@ -4266,7 +4203,6 @@ ixgbe_dev_interrupt_action(struct rte_eth_dev *dev,
 	struct ixgbe_interrupt *intr =
 		IXGBE_DEV_PRIVATE_TO_INTR(dev->data->dev_private);
 	int64_t timeout;
-	struct rte_eth_link link;
 	struct ixgbe_hw *hw =
 		IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 
@@ -4283,9 +4219,10 @@ ixgbe_dev_interrupt_action(struct rte_eth_dev *dev,
 	}
 
 	if (intr->flags & IXGBE_FLAG_NEED_LINK_UPDATE) {
+		struct rte_eth_link link;
+
 		/* get the link status before link update, for predicting later */
-		memset(&link, 0, sizeof(link));
-		rte_ixgbe_dev_atomic_read_link_status(dev, &link);
+		rte_eth_linkstatus_get(dev, &link);
 
 		ixgbe_dev_link_update(dev, 0);
 
@@ -6804,9 +6741,8 @@ ixgbe_start_timecounters(struct rte_eth_dev *dev)
 	uint32_t shift = 0;
 
 	/* Get current link speed. */
-	memset(&link, 0, sizeof(link));
 	ixgbe_dev_link_update(dev, 1);
-	rte_ixgbe_dev_atomic_read_link_status(dev, &link);
+	rte_eth_linkstatus_get(dev, &link);
 
 	switch (link.link_speed) {
 	case ETH_SPEED_NUM_100M:
-- 
2.15.1

[PATCH v8 09/15] net/sfc: use new rte_eth_linkstatus functions

[Stephen Hemminger]

Use the new API rte_eth_linkstatus_set to handle link status update.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/sfc/sfc_ethdev.c | 24 +++++-------------------
 drivers/net/sfc/sfc_ev.c     | 20 ++------------------
 2 files changed, 7 insertions(+), 37 deletions(-)

diff --git a/drivers/net/sfc/sfc_ethdev.c b/drivers/net/sfc/sfc_ethdev.c
index 89a452907621..7d51db979a03 100644
--- a/drivers/net/sfc/sfc_ethdev.c
+++ b/drivers/net/sfc/sfc_ethdev.c
@@ -236,22 +236,13 @@ static int
 sfc_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete)
 {
 	struct sfc_adapter *sa = dev->data->dev_private;
-	struct rte_eth_link *dev_link = &dev->data->dev_link;
-	struct rte_eth_link old_link;
 	struct rte_eth_link current_link;
+	int ret;
 
 	sfc_log_init(sa, "entry");
 
-retry:
-	EFX_STATIC_ASSERT(sizeof(*dev_link) == sizeof(rte_atomic64_t));
-	*(int64_t *)&old_link = rte_atomic64_read((rte_atomic64_t *)dev_link);
-
 	if (sa->state != SFC_ADAPTER_STARTED) {
 		sfc_port_link_mode_to_info(EFX_LINK_UNKNOWN, &current_link);
-		if (!rte_atomic64_cmpset((volatile uint64_t *)dev_link,
-					 *(uint64_t *)&old_link,
-					 *(uint64_t *)&current_link))
-			goto retry;
 	} else if (wait_to_complete) {
 		efx_link_mode_t link_mode;
 
@@ -259,21 +250,16 @@ sfc_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete)
 			link_mode = EFX_LINK_UNKNOWN;
 		sfc_port_link_mode_to_info(link_mode, &current_link);
 
-		if (!rte_atomic64_cmpset((volatile uint64_t *)dev_link,
-					 *(uint64_t *)&old_link,
-					 *(uint64_t *)&current_link))
-			goto retry;
 	} else {
 		sfc_ev_mgmt_qpoll(sa);
-		*(int64_t *)&current_link =
-			rte_atomic64_read((rte_atomic64_t *)dev_link);
+		rte_eth_linkstatus_get(dev, &current_link);
 	}
 
-	if (old_link.link_status != current_link.link_status)
+	ret = rte_eth_linkstatus_set(dev, &current_link);
+	if (ret == 0)
 		sfc_info(sa, "Link status is %s",
 			 current_link.link_status ? "UP" : "DOWN");
-
-	return old_link.link_status == current_link.link_status ? 0 : -1;
+	return ret;
 }
 
 static void
diff --git a/drivers/net/sfc/sfc_ev.c b/drivers/net/sfc/sfc_ev.c
index 7abe61ae5ff1..273a92ccb222 100644
--- a/drivers/net/sfc/sfc_ev.c
+++ b/drivers/net/sfc/sfc_ev.c
@@ -382,27 +382,11 @@ sfc_ev_link_change(void *arg, efx_link_mode_t link_mode)
 {
 	struct sfc_evq *evq = arg;
 	struct sfc_adapter *sa = evq->sa;
-	struct rte_eth_link *dev_link = &sa->eth_dev->data->dev_link;
 	struct rte_eth_link new_link;
-	uint64_t new_link_u64;
-	uint64_t old_link_u64;
-
-	EFX_STATIC_ASSERT(sizeof(*dev_link) == sizeof(rte_atomic64_t));
 
 	sfc_port_link_mode_to_info(link_mode, &new_link);
-
-	new_link_u64 = *(uint64_t *)&new_link;
-	do {
-		old_link_u64 = rte_atomic64_read((rte_atomic64_t *)dev_link);
-		if (old_link_u64 == new_link_u64)
-			break;
-
-		if (rte_atomic64_cmpset((volatile uint64_t *)dev_link,
-					old_link_u64, new_link_u64)) {
-			evq->sa->port.lsc_seq++;
-			break;
-		}
-	} while (B_TRUE);
+	if (rte_eth_linkstatus_set(sa->eth_dev, &new_link))
+		evq->sa->port.lsc_seq++;
 
 	return B_FALSE;
 }
-- 
2.15.1

[PATCH v8 10/15] net/i40e: use rte_eth_linkstatus functions

[Stephen Hemminger]

Use new rte_linkstatus update API

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/i40e/i40e_ethdev.c    | 46 ++++++---------------------------------
 drivers/net/i40e/i40e_ethdev_vf.c | 19 ++--------------
 2 files changed, 9 insertions(+), 56 deletions(-)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index c4df65df0cf6..85c02e82d7db 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -628,34 +628,6 @@ static struct rte_pci_driver rte_i40e_pmd = {
 	.remove = eth_i40e_pci_remove,
 };
 
-static inline int
-rte_i40e_dev_atomic_read_link_status(struct rte_eth_dev *dev,
-				     struct rte_eth_link *link)
-{
-	struct rte_eth_link *dst = link;
-	struct rte_eth_link *src = &(dev->data->dev_link);
-
-	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
-					*(uint64_t *)src) == 0)
-		return -1;
-
-	return 0;
-}
-
-static inline int
-rte_i40e_dev_atomic_write_link_status(struct rte_eth_dev *dev,
-				      struct rte_eth_link *link)
-{
-	struct rte_eth_link *dst = &(dev->data->dev_link);
-	struct rte_eth_link *src = link;
-
-	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
-					*(uint64_t *)src) == 0)
-		return -1;
-
-	return 0;
-}
-
 RTE_PMD_REGISTER_PCI(net_i40e, rte_i40e_pmd);
 RTE_PMD_REGISTER_PCI_TABLE(net_i40e, pci_id_i40e_map);
 RTE_PMD_REGISTER_KMOD_DEP(net_i40e, "* igb_uio | uio_pci_generic | vfio-pci");
@@ -2347,17 +2319,17 @@ i40e_dev_link_update(struct rte_eth_dev *dev,
 #define MAX_REPEAT_TIME 10  /* 1s (10 * 100ms) in total */
 	struct i40e_hw *hw = I40E_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 	struct i40e_link_status link_status;
-	struct rte_eth_link link, old;
+	struct rte_eth_link link;
 	int status;
 	unsigned rep_cnt = MAX_REPEAT_TIME;
 	bool enable_lse = dev->data->dev_conf.intr_conf.lsc ? true : false;
+	int ret;
 
 	memset(&link, 0, sizeof(link));
-	memset(&old, 0, sizeof(old));
-	memset(&link_status, 0, sizeof(link_status));
-	rte_i40e_dev_atomic_read_link_status(dev, &old);
 
 	do {
+		memset(&link_status, 0, sizeof(link_status));
+
 		/* Get link status information from hardware */
 		status = i40e_aq_get_link_info(hw, enable_lse,
 						&link_status, NULL);
@@ -2410,13 +2382,10 @@ i40e_dev_link_update(struct rte_eth_dev *dev,
 			ETH_LINK_SPEED_FIXED);
 
 out:
-	rte_i40e_dev_atomic_write_link_status(dev, &link);
-	if (link.link_status == old.link_status)
-		return -1;
-
+	ret = rte_eth_linkstatus_set(dev, &link);
 	i40e_notify_all_vfs_link_status(dev);
 
-	return 0;
+	return ret;
 }
 
 /* Get all the statistics of a VSI */
@@ -10034,9 +10003,8 @@ i40e_start_timecounters(struct rte_eth_dev *dev)
 	uint32_t tsync_inc_h;
 
 	/* Get current link speed. */
-	memset(&link, 0, sizeof(link));
 	i40e_dev_link_update(dev, 1);
-	rte_i40e_dev_atomic_read_link_status(dev, &link);
+	rte_eth_linkstatus_get(dev, &link);
 
 	switch (link.link_speed) {
 	case ETH_SPEED_NUM_40G:
diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index 6ac3f8c04a50..800915386501 100644
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -1036,20 +1036,6 @@ static const struct rte_pci_id pci_id_i40evf_map[] = {
 	{ .vendor_id = 0, /* sentinel */ },
 };
 
-static inline int
-i40evf_dev_atomic_write_link_status(struct rte_eth_dev *dev,
-				    struct rte_eth_link *link)
-{
-	struct rte_eth_link *dst = &(dev->data->dev_link);
-	struct rte_eth_link *src = link;
-
-	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
-					*(uint64_t *)src) == 0)
-		return -1;
-
-	return 0;
-}
-
 /* Disable IRQ0 */
 static inline void
 i40evf_disable_irq0(struct i40e_hw *hw)
@@ -2077,6 +2063,7 @@ i40evf_dev_link_update(struct rte_eth_dev *dev,
 	 * while Linux driver does not
 	 */
 
+	memset(&new_link, 0, sizeof(new_link));
 	/* Linux driver PF host */
 	switch (vf->link_speed) {
 	case I40E_LINK_SPEED_100MB:
@@ -2108,9 +2095,7 @@ i40evf_dev_link_update(struct rte_eth_dev *dev,
 	new_link.link_autoneg =
 		dev->data->dev_conf.link_speeds & ETH_LINK_SPEED_FIXED;
 
-	i40evf_dev_atomic_write_link_status(dev, &new_link);
-
-	return 0;
+	return rte_eth_linkstatus_set(dev, &new_link);
 }
 
 static void
-- 
2.15.1

[PATCH v8 11/15] net/liquidio: use rte_eth_linkstatus_set

[Stephen Hemminger]

Use the new link update API, and cleanup the logic in the the
link update routine.

Tested-by: Shijith Thotton <shijith.thotton@caviumnetworks.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/liquidio/lio_ethdev.c | 44 ++++-----------------------------------
 1 file changed, 4 insertions(+), 40 deletions(-)

diff --git a/drivers/net/liquidio/lio_ethdev.c b/drivers/net/liquidio/lio_ethdev.c
index 843d023383f7..f44e5a952cbf 100644
--- a/drivers/net/liquidio/lio_ethdev.c
+++ b/drivers/net/liquidio/lio_ethdev.c
@@ -904,32 +904,6 @@ lio_dev_vlan_filter_set(struct rte_eth_dev *eth_dev, uint16_t vlan_id, int on)
 	return 0;
 }
 
-/**
- * Atomically writes the link status information into global
- * structure rte_eth_dev.
- *
- * @param eth_dev
- *   - Pointer to the structure rte_eth_dev to read from.
- *   - Pointer to the buffer to be saved with the link status.
- *
- * @return
- *   - On success, zero.
- *   - On failure, negative value.
- */
-static inline int
-lio_dev_atomic_write_link_status(struct rte_eth_dev *eth_dev,
-				 struct rte_eth_link *link)
-{
-	struct rte_eth_link *dst = &eth_dev->data->dev_link;
-	struct rte_eth_link *src = link;
-
-	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
-				*(uint64_t *)src) == 0)
-		return -1;
-
-	return 0;
-}
-
 static uint64_t
 lio_hweight64(uint64_t w)
 {
@@ -949,23 +923,19 @@ lio_dev_link_update(struct rte_eth_dev *eth_dev,
 		    int wait_to_complete __rte_unused)
 {
 	struct lio_device *lio_dev = LIO_DEV(eth_dev);
-	struct rte_eth_link link, old;
+	struct rte_eth_link link;
 
 	/* Initialize */
+	memset(&link, 0, sizeof(link));
 	link.link_status = ETH_LINK_DOWN;
 	link.link_speed = ETH_SPEED_NUM_NONE;
 	link.link_duplex = ETH_LINK_HALF_DUPLEX;
 	link.link_autoneg = ETH_LINK_AUTONEG;
-	memset(&old, 0, sizeof(old));
 
 	/* Return what we found */
 	if (lio_dev->linfo.link.s.link_up == 0) {
 		/* Interface is down */
-		if (lio_dev_atomic_write_link_status(eth_dev, &link))
-			return -1;
-		if (link.link_status == old.link_status)
-			return -1;
-		return 0;
+		return rte_eth_linkstatus_set(eth_dev, &link);
 	}
 
 	link.link_status = ETH_LINK_UP; /* Interface is up */
@@ -982,13 +952,7 @@ lio_dev_link_update(struct rte_eth_dev *eth_dev,
 		link.link_duplex = ETH_LINK_HALF_DUPLEX;
 	}
 
-	if (lio_dev_atomic_write_link_status(eth_dev, &link))
-		return -1;
-
-	if (link.link_status == old.link_status)
-		return -1;
-
-	return 0;
+	return rte_eth_linkstatus_set(eth_dev, &link);
 }
 
 /**
-- 
2.15.1

[PATCH v8 12/15] net/thunderx: use rte_eth_linkstatus_set

[Stephen Hemminger]

Use new helper function.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/thunderx/nicvf_ethdev.c | 45 +++++++++++++++----------------------
 1 file changed, 18 insertions(+), 27 deletions(-)

diff --git a/drivers/net/thunderx/nicvf_ethdev.c b/drivers/net/thunderx/nicvf_ethdev.c
index d34938c64b1d..fc5c9a486937 100644
--- a/drivers/net/thunderx/nicvf_ethdev.c
+++ b/drivers/net/thunderx/nicvf_ethdev.c
@@ -15,7 +15,6 @@
 #include <sys/queue.h>
 
 #include <rte_alarm.h>
-#include <rte_atomic.h>
 #include <rte_branch_prediction.h>
 #include <rte_byteorder.h>
 #include <rte_common.h>
@@ -69,25 +68,14 @@ nicvf_init_log(void)
 		rte_log_set_level(nicvf_logtype_driver, RTE_LOG_NOTICE);
 }
 
-static inline int
-nicvf_atomic_write_link_status(struct rte_eth_dev *dev,
-			       struct rte_eth_link *link)
+static void
+nicvf_link_status_update(struct nicvf *nic,
+			 struct rte_eth_link *link)
 {
-	struct rte_eth_link *dst = &dev->data->dev_link;
-	struct rte_eth_link *src = link;
-
-	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
-		*(uint64_t *)src) == 0)
-		return -1;
+	memset(link, 0, sizeof(*link));
 
-	return 0;
-}
+	link->link_status = nic->link_up ? ETH_LINK_UP : ETH_LINK_DOWN;
 
-static inline void
-nicvf_set_eth_link_status(struct nicvf *nic, struct rte_eth_link *link)
-{
-	link->link_status = nic->link_up;
-	link->link_duplex = ETH_LINK_AUTONEG;
 	if (nic->duplex == NICVF_HALF_DUPLEX)
 		link->link_duplex = ETH_LINK_HALF_DUPLEX;
 	else if (nic->duplex == NICVF_FULL_DUPLEX)
@@ -101,12 +89,16 @@ nicvf_interrupt(void *arg)
 {
 	struct rte_eth_dev *dev = arg;
 	struct nicvf *nic = nicvf_pmd_priv(dev);
+	struct rte_eth_link link;
 
 	if (nicvf_reg_poll_interrupts(nic) == NIC_MBOX_MSG_BGX_LINK_CHANGE) {
-		if (dev->data->dev_conf.intr_conf.lsc)
-			nicvf_set_eth_link_status(nic, &dev->data->dev_link);
-		_rte_eth_dev_callback_process(dev, RTE_ETH_EVENT_INTR_LSC,
-					      NULL);
+		if (dev->data->dev_conf.intr_conf.lsc) {
+			nicvf_link_status_update(nic, &link);
+			rte_eth_linkstatus_set(dev, &link);
+
+			_rte_eth_dev_callback_process(dev, RTE_ETH_EVENT_INTR_LSC,
+						      NULL);
+		}
 	}
 
 	rte_eal_alarm_set(NICVF_INTR_POLL_INTERVAL_MS * 1000,
@@ -153,17 +145,16 @@ nicvf_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete)
 	if (wait_to_complete) {
 		/* rte_eth_link_get() might need to wait up to 9 seconds */
 		for (i = 0; i < MAX_CHECK_TIME; i++) {
-			memset(&link, 0, sizeof(link));
-			nicvf_set_eth_link_status(nic, &link);
-			if (link.link_status)
+			nicvf_link_status_update(nic, &link);
+			if (link.link_status == ETH_LINK_UP)
 				break;
 			rte_delay_ms(CHECK_INTERVAL);
 		}
 	} else {
-		memset(&link, 0, sizeof(link));
-		nicvf_set_eth_link_status(nic, &link);
+		nicvf_link_status_update(nic, &link);
 	}
-	return nicvf_atomic_write_link_status(dev, &link);
+
+	return rte_eth_linkstatus_set(dev, &link);
 }
 
 static int
-- 
2.15.1

[PATCH v8 13/15] net/szedata: use _rte_eth_linkstatus_set

[Stephen Hemminger]

Yet another driver which was not returing correct value on
link change.

Since this driver can't be built on x86 could not even
do a compile test.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/szedata2/rte_eth_szedata2.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/net/szedata2/rte_eth_szedata2.c b/drivers/net/szedata2/rte_eth_szedata2.c
index e53c738db546..133a20197b02 100644
--- a/drivers/net/szedata2/rte_eth_szedata2.c
+++ b/drivers/net/szedata2/rte_eth_szedata2.c
@@ -50,7 +50,6 @@
 #include <rte_memcpy.h>
 #include <rte_kvargs.h>
 #include <rte_dev.h>
-#include <rte_atomic.h>
 
 #include "rte_eth_szedata2.h"
 #include "szedata2_iobuf.h"
@@ -1174,14 +1173,14 @@ eth_link_update(struct rte_eth_dev *dev,
 		int wait_to_complete __rte_unused)
 {
 	struct rte_eth_link link;
-	struct rte_eth_link *link_ptr = &link;
-	struct rte_eth_link *dev_link = &dev->data->dev_link;
 	struct pmd_internals *internals = (struct pmd_internals *)
 		dev->data->dev_private;
 	const volatile struct szedata2_ibuf *ibuf;
 	uint32_t i;
 	bool link_is_up = false;
 
+	memset(&link, 0, sizeof(link));
+	
 	switch (get_link_speed(internals)) {
 	case SZEDATA2_LINK_SPEED_10G:
 		link.link_speed = ETH_SPEED_NUM_10G;
@@ -1212,13 +1211,11 @@ eth_link_update(struct rte_eth_dev *dev,
 		}
 	}
 
-	link.link_status = (link_is_up) ? ETH_LINK_UP : ETH_LINK_DOWN;
+	link.link_status = link_is_up ? ETH_LINK_UP : ETH_LINK_DOWN;
 
 	link.link_autoneg = ETH_LINK_FIXED;
 
-	rte_atomic64_cmpset((uint64_t *)dev_link, *(uint64_t *)dev_link,
-			*(uint64_t *)link_ptr);
-
+	rte_eth_linkstatus_set(dev, &link);
 	return 0;
 }
 
-- 
2.15.1

[PATCH v8 14/15] net/octeontx: use rte_eth_linkstatus_set

[Stephen Hemminger]

Common function matches this drivers usage.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/octeontx/octeontx_ethdev.c | 16 +---------------
 1 file changed, 1 insertion(+), 15 deletions(-)

diff --git a/drivers/net/octeontx/octeontx_ethdev.c b/drivers/net/octeontx/octeontx_ethdev.c
index adca3435e4af..68a617051d0b 100644
--- a/drivers/net/octeontx/octeontx_ethdev.c
+++ b/drivers/net/octeontx/octeontx_ethdev.c
@@ -487,20 +487,6 @@ octeontx_dev_promisc_disable(struct rte_eth_dev *dev)
 	octeontx_port_promisc_set(nic, 0);
 }
 
-static inline int
-octeontx_atomic_write_link_status(struct rte_eth_dev *dev,
-				  struct rte_eth_link *link)
-{
-	struct rte_eth_link *dst = &dev->data->dev_link;
-	struct rte_eth_link *src = link;
-
-	if (rte_atomic64_cmpset((uint64_t *)dst, *(uint64_t *)dst,
-		*(uint64_t *)src) == 0)
-		return -1;
-
-	return 0;
-}
-
 static int
 octeontx_port_link_status(struct octeontx_nic *nic)
 {
@@ -572,7 +558,7 @@ octeontx_dev_link_update(struct rte_eth_dev *dev,
 	link.link_duplex = ETH_LINK_FULL_DUPLEX;
 	link.link_autoneg = ETH_LINK_AUTONEG;
 
-	return octeontx_atomic_write_link_status(dev, &link);
+	return rte_eth_linkstatus_set(dev, &link);
 }
 
 static int
-- 
2.15.1

[PATCH v8 15/15] net/enic: use rte_eth_linkstatus_set

[Stephen Hemminger]

This driver was not doing atomic update of link status information.
And the return value was different than others.
The hardware also does not do autonegotiation (at least on Linux).

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/enic/enic_ethdev.c |  5 ++---
 drivers/net/enic/enic_main.c   | 16 +++++++---------
 2 files changed, 9 insertions(+), 12 deletions(-)

diff --git a/drivers/net/enic/enic_ethdev.c b/drivers/net/enic/enic_ethdev.c
index e1ff9dcbd713..7d10b70a341a 100644
--- a/drivers/net/enic/enic_ethdev.c
+++ b/drivers/net/enic/enic_ethdev.c
@@ -426,10 +426,9 @@ static void enicpmd_dev_stop(struct rte_eth_dev *eth_dev)
 
 	ENICPMD_FUNC_TRACE();
 	enic_disable(enic);
+
 	memset(&link, 0, sizeof(link));
-	rte_atomic64_cmpset((uint64_t *)&eth_dev->data->dev_link,
-		*(uint64_t *)&eth_dev->data->dev_link,
-		*(uint64_t *)&link);
+	rte_eth_linkstatus_set(eth_dev, &link);
 }
 
 /*
diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c
index 9274defd998e..b26d18296c8a 100644
--- a/drivers/net/enic/enic_main.c
+++ b/drivers/net/enic/enic_main.c
@@ -379,16 +379,14 @@ enic_free_consistent(void *priv,
 int enic_link_update(struct enic *enic)
 {
 	struct rte_eth_dev *eth_dev = enic->rte_dev;
-	int ret;
-	int link_status = 0;
+	struct rte_eth_link link;
 
-	link_status = enic_get_link_status(enic);
-	ret = (link_status == enic->link_status);
-	enic->link_status = link_status;
-	eth_dev->data->dev_link.link_status = link_status;
-	eth_dev->data->dev_link.link_duplex = ETH_LINK_FULL_DUPLEX;
-	eth_dev->data->dev_link.link_speed = vnic_dev_port_speed(enic->vdev);
-	return ret;
+	memset(&link, 0, sizeof(link));
+	link.link_status = enic_get_link_status(enic);
+	link.link_duplex = ETH_LINK_FULL_DUPLEX;
+	link.link_speed = vnic_dev_port_speed(enic->vdev);
+
+	return rte_eth_linkstatus_set(eth_dev, &link);
 }
 
 static void
-- 
2.15.1

Re: [PATCH v8 09/15] net/sfc: use new rte_eth_linkstatus functions

[Andrew Rybchenko]

On 01/26/2018 05:01 AM, Stephen Hemminger wrote:
> Use the new API rte_eth_linkstatus_set to handle link status update.
>
> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> ---
>   drivers/net/sfc/sfc_ethdev.c | 24 +++++-------------------
>   drivers/net/sfc/sfc_ev.c     | 20 ++------------------
>   2 files changed, 7 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/net/sfc/sfc_ethdev.c b/drivers/net/sfc/sfc_ethdev.c
> index 89a452907621..7d51db979a03 100644
> --- a/drivers/net/sfc/sfc_ethdev.c
> +++ b/drivers/net/sfc/sfc_ethdev.c
> @@ -236,22 +236,13 @@ static int
>   sfc_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete)
>   {
>   	struct sfc_adapter *sa = dev->data->dev_private;
> -	struct rte_eth_link *dev_link = &dev->data->dev_link;
> -	struct rte_eth_link old_link;
>   	struct rte_eth_link current_link;
> +	int ret;
>   
>   	sfc_log_init(sa, "entry");
>   
> -retry:
> -	EFX_STATIC_ASSERT(sizeof(*dev_link) == sizeof(rte_atomic64_t));
> -	*(int64_t *)&old_link = rte_atomic64_read((rte_atomic64_t *)dev_link);
> -
>   	if (sa->state != SFC_ADAPTER_STARTED) {
>   		sfc_port_link_mode_to_info(EFX_LINK_UNKNOWN, &current_link);
> -		if (!rte_atomic64_cmpset((volatile uint64_t *)dev_link,
> -					 *(uint64_t *)&old_link,
> -					 *(uint64_t *)&current_link))
> -			goto retry;
>   	} else if (wait_to_complete) {
>   		efx_link_mode_t link_mode;
>   
> @@ -259,21 +250,16 @@ sfc_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete)
>   			link_mode = EFX_LINK_UNKNOWN;
>   		sfc_port_link_mode_to_info(link_mode, &current_link);
>   
> -		if (!rte_atomic64_cmpset((volatile uint64_t *)dev_link,
> -					 *(uint64_t *)&old_link,
> -					 *(uint64_t *)&current_link))
> -			goto retry;
>   	} else {
>   		sfc_ev_mgmt_qpoll(sa);
> -		*(int64_t *)&current_link =
> -			rte_atomic64_read((rte_atomic64_t *)dev_link);
> +		rte_eth_linkstatus_get(dev, &current_link);
>   	}
>   
> -	if (old_link.link_status != current_link.link_status)
> +	ret = rte_eth_linkstatus_set(dev, &current_link);
> +	if (ret == 0)
>   		sfc_info(sa, "Link status is %s",
>   			 current_link.link_status ? "UP" : "DOWN");
> -
> -	return old_link.link_status == current_link.link_status ? 0 : -1;
> +	return ret;
>   }
>   
>   static void

These changes are OK.

> diff --git a/drivers/net/sfc/sfc_ev.c b/drivers/net/sfc/sfc_ev.c
> index 7abe61ae5ff1..273a92ccb222 100644
> --- a/drivers/net/sfc/sfc_ev.c
> +++ b/drivers/net/sfc/sfc_ev.c
> @@ -382,27 +382,11 @@ sfc_ev_link_change(void *arg, efx_link_mode_t link_mode)
>   {
>   	struct sfc_evq *evq = arg;
>   	struct sfc_adapter *sa = evq->sa;
> -	struct rte_eth_link *dev_link = &sa->eth_dev->data->dev_link;
>   	struct rte_eth_link new_link;
> -	uint64_t new_link_u64;
> -	uint64_t old_link_u64;
> -
> -	EFX_STATIC_ASSERT(sizeof(*dev_link) == sizeof(rte_atomic64_t));
>   
>   	sfc_port_link_mode_to_info(link_mode, &new_link);
> -
> -	new_link_u64 = *(uint64_t *)&new_link;
> -	do {
> -		old_link_u64 = rte_atomic64_read((rte_atomic64_t *)dev_link);
> -		if (old_link_u64 == new_link_u64)
> -			break;
> -
> -		if (rte_atomic64_cmpset((volatile uint64_t *)dev_link,
> -					old_link_u64, new_link_u64)) {
> -			evq->sa->port.lsc_seq++;
> -			break;
> -		}
> -	} while (B_TRUE);
> +	if (rte_eth_linkstatus_set(sa->eth_dev, &new_link))
> +		evq->sa->port.lsc_seq++;
>   
>   	return B_FALSE;
>   }

Let me repeat part of my review notes for v4:
 >>
lsc_seq should be incremented in the case of any changes in link,
not up/down changes only and it should be preserved.
<<
and I'd like to keep it here. Thanks to rte_atomic64_exchange()
the function can be simplified to:
  - convert link mode to link info (as now)
  - do exchange
  - compare old and new value as uint64_t and increment lsc_seq
    if different

Thanks.

Re: [PATCH v8 01/15] eal: introduce atomic exchange operation

[Thomas Monjalon]

26/01/2018 03:01, Stephen Hemminger:
> To handle atomic update of link status (64 bit), every driver
> was doing its own version using cmpset.
> Atomic exchange is a useful primitive in its own right;
> therefore make it a EAL routine.
> 
> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> ---
>  .../common/include/arch/ppc_64/rte_atomic.h        | 21 +++++-
>  .../common/include/arch/x86/rte_atomic.h           | 24 +++++++
>  .../common/include/arch/x86/rte_atomic_32.h        | 12 ++++
>  .../common/include/arch/x86/rte_atomic_64.h        | 12 ++++
>  lib/librte_eal/common/include/generic/rte_atomic.h | 78 ++++++++++++++++++++++
>  5 files changed, 146 insertions(+), 1 deletion(-)

Looks good, thanks.

It probably deserves a review by PPC experts.
Adding Chao, maintainer of this part.
+ Bruce and Konstantin for x86 part.

Re: [PATCH v8 01/15] eal: introduce atomic exchange operation

[Bruce Richardson]

On Fri, Jan 26, 2018 at 06:14:01PM +0100, Thomas Monjalon wrote:
> 26/01/2018 03:01, Stephen Hemminger:
> > To handle atomic update of link status (64 bit), every driver was
> > doing its own version using cmpset.  Atomic exchange is a useful
> > primitive in its own right; therefore make it a EAL routine.
> > 
> > Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> ---
> > .../common/include/arch/ppc_64/rte_atomic.h        | 21 +++++-
> > .../common/include/arch/x86/rte_atomic.h           | 24 +++++++
> > .../common/include/arch/x86/rte_atomic_32.h        | 12 ++++
> > .../common/include/arch/x86/rte_atomic_64.h        | 12 ++++
> > lib/librte_eal/common/include/generic/rte_atomic.h | 78
> > ++++++++++++++++++++++ 5 files changed, 146 insertions(+), 1
> > deletion(-)
> 
> Looks good, thanks.
> 
> It probably deserves a review by PPC experts.  Adding Chao, maintainer
> of this part.  + Bruce and Konstantin for x86 part.
> 
Would it not be simpler to use __sync_bool_compare_and_swap compiler
built-in on all supported platforms? Do we really need the per-platform
optimization of this?

/Bruce

Re: [PATCH v8 01/15] eal: introduce atomic exchange operation

[Ananyev, Konstantin]

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Stephen Hemminger
> Sent: Friday, January 26, 2018 2:02 AM
> To: dev@dpdk.org
> Cc: Stephen Hemminger <stephen@networkplumber.org>
> Subject: [dpdk-dev] [PATCH v8 01/15] eal: introduce atomic exchange operation
> 
> To handle atomic update of link status (64 bit), every driver
> was doing its own version using cmpset.
> Atomic exchange is a useful primitive in its own right;
> therefore make it a EAL routine.
> 
> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> ---
>  .../common/include/arch/ppc_64/rte_atomic.h        | 21 +++++-
>  .../common/include/arch/x86/rte_atomic.h           | 24 +++++++
>  .../common/include/arch/x86/rte_atomic_32.h        | 12 ++++
>  .../common/include/arch/x86/rte_atomic_64.h        | 12 ++++
>  lib/librte_eal/common/include/generic/rte_atomic.h | 78 ++++++++++++++++++++++

Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>

Re: [PATCH v8 01/15] eal: introduce atomic exchange operation

[Stephen Hemminger]

On Fri, 26 Jan 2018 17:24:40 +0000
Bruce Richardson <bruce.richardson@intel.com> wrote:

> On Fri, Jan 26, 2018 at 06:14:01PM +0100, Thomas Monjalon wrote:
> > 26/01/2018 03:01, Stephen Hemminger:  
> > > To handle atomic update of link status (64 bit), every driver was
> > > doing its own version using cmpset.  Atomic exchange is a useful
> > > primitive in its own right; therefore make it a EAL routine.
> > > 
> > > Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> ---
> > > .../common/include/arch/ppc_64/rte_atomic.h        | 21 +++++-
> > > .../common/include/arch/x86/rte_atomic.h           | 24 +++++++
> > > .../common/include/arch/x86/rte_atomic_32.h        | 12 ++++
> > > .../common/include/arch/x86/rte_atomic_64.h        | 12 ++++
> > > lib/librte_eal/common/include/generic/rte_atomic.h | 78
> > > ++++++++++++++++++++++ 5 files changed, 146 insertions(+), 1
> > > deletion(-)  
> > 
> > Looks good, thanks.
> > 
> > It probably deserves a review by PPC experts.  Adding Chao, maintainer
> > of this part.  + Bruce and Konstantin for x86 part.
> >   
> Would it not be simpler to use __sync_bool_compare_and_swap compiler
> built-in on all supported platforms? Do we really need the per-platform
> optimization of this?
> 
> /Bruce

Exchange is different than compare and swap. The is nice atomic intrinsic
in GCC. The x86 part is in Linux and BSD already.

Re: [PATCH v8 01/15] eal: introduce atomic exchange operation

[Bruce Richardson]

On Fri, Jan 26, 2018 at 01:54:23PM -0800, Stephen Hemminger wrote:
> On Fri, 26 Jan 2018 17:24:40 +0000
> Bruce Richardson <bruce.richardson@intel.com> wrote:
> 
> > On Fri, Jan 26, 2018 at 06:14:01PM +0100, Thomas Monjalon wrote:
> > > 26/01/2018 03:01, Stephen Hemminger:  
> > > > To handle atomic update of link status (64 bit), every driver was
> > > > doing its own version using cmpset.  Atomic exchange is a useful
> > > > primitive in its own right; therefore make it a EAL routine.
> > > > 
> > > > Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> ---
> > > > .../common/include/arch/ppc_64/rte_atomic.h        | 21 +++++-
> > > > .../common/include/arch/x86/rte_atomic.h           | 24 +++++++
> > > > .../common/include/arch/x86/rte_atomic_32.h        | 12 ++++
> > > > .../common/include/arch/x86/rte_atomic_64.h        | 12 ++++
> > > > lib/librte_eal/common/include/generic/rte_atomic.h | 78
> > > > ++++++++++++++++++++++ 5 files changed, 146 insertions(+), 1
> > > > deletion(-)  
> > > 
> > > Looks good, thanks.
> > > 
> > > It probably deserves a review by PPC experts.  Adding Chao, maintainer
> > > of this part.  + Bruce and Konstantin for x86 part.
> > >   
> > Would it not be simpler to use __sync_bool_compare_and_swap compiler
> > built-in on all supported platforms? Do we really need the per-platform
> > optimization of this?
> > 
> > /Bruce
> 
> Exchange is different than compare and swap. The is nice atomic intrinsic
> in GCC. The x86 part is in Linux and BSD already.

Yes, sorry, I picked the wrong builtin. I should have referenced
instead "__sync_lock_test_and_set", which is an xchg op according to the
docs [https://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/Atomic-Builtins.html].

Re: [PATCH v8 00/15] common linkstatus functions

[Ferruh Yigit]

On 1/26/2018 2:01 AM, Stephen Hemminger wrote:
> While writing hyper-v driver, noticed a lot of unnecessary
> duplication of code in drivers for handling the eth_dev link status
> information. While consolidating this, it also became obvious that
> some drivers behave differently for no good reason.
> 
> It also was a good chance to introduce atomic exchange primitives
> in EAL because there are other places using cmpset where not
> necessary (such as bonding).
> 
> Mostly only compile tested only, don't have all of the hardware
> available (except ixgbe and virtio) to test.
> 
> v8
>   - fix typo in 32bit exchange
>   - fix build of dpaa2
>   - go back to same return value as original code
>   - reduce number of lines changed
> 
> v7
>   - add exchange functions for PPC64
>   - move linkstatus helpers to rte_ethdev_driver
>   - rebase to 18.02
> 
> Stephen Hemminger (15):
>   eal: introduce atomic exchange operation
>   ethdev: add linkstatus get/set helper functions
>   net/virtio: use eth_linkstatus_set
>   net/vmxnet3: use rte_eth_linkstatus_set
>   net/dpaa2: use rte_eth_linkstatus_set
>   net/nfp: use rte_eth_linkstatus functions
>   net/e1000: use rte_eth_linkstatus helpers
>   net/ixgbe: use rte_eth_linkstatus functions
>   net/sfc: use new rte_eth_linkstatus functions
>   net/i40e: use rte_eth_linkstatus functions
>   net/liquidio: use rte_eth_linkstatus_set
>   net/thunderx: use rte_eth_linkstatus_set
>   net/szedata: use _rte_eth_linkstatus_set
>   net/octeontx: use rte_eth_linkstatus_set
>   net/enic: use rte_eth_linkstatus_set

For series
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

Re: [PATCH v8 00/15] common linkstatus functions

[Ferruh Yigit]

On 3/15/2018 5:38 PM, Ferruh Yigit wrote:
> On 1/26/2018 2:01 AM, Stephen Hemminger wrote:
>> While writing hyper-v driver, noticed a lot of unnecessary
>> duplication of code in drivers for handling the eth_dev link status
>> information. While consolidating this, it also became obvious that
>> some drivers behave differently for no good reason.
>>
>> It also was a good chance to introduce atomic exchange primitives
>> in EAL because there are other places using cmpset where not
>> necessary (such as bonding).
>>
>> Mostly only compile tested only, don't have all of the hardware
>> available (except ixgbe and virtio) to test.
>>
>> v8
>>   - fix typo in 32bit exchange
>>   - fix build of dpaa2
>>   - go back to same return value as original code
>>   - reduce number of lines changed
>>
>> v7
>>   - add exchange functions for PPC64
>>   - move linkstatus helpers to rte_ethdev_driver
>>   - rebase to 18.02
>>
>> Stephen Hemminger (15):
>>   eal: introduce atomic exchange operation
>>   ethdev: add linkstatus get/set helper functions
>>   net/virtio: use eth_linkstatus_set
>>   net/vmxnet3: use rte_eth_linkstatus_set
>>   net/dpaa2: use rte_eth_linkstatus_set
>>   net/nfp: use rte_eth_linkstatus functions
>>   net/e1000: use rte_eth_linkstatus helpers
>>   net/ixgbe: use rte_eth_linkstatus functions
>>   net/sfc: use new rte_eth_linkstatus functions
>>   net/i40e: use rte_eth_linkstatus functions
>>   net/liquidio: use rte_eth_linkstatus_set
>>   net/thunderx: use rte_eth_linkstatus_set
>>   net/szedata: use _rte_eth_linkstatus_set
>>   net/octeontx: use rte_eth_linkstatus_set
>>   net/enic: use rte_eth_linkstatus_set
> 
> For series
> Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

Series applied to dpdk-next-net/master, thanks.

(Need to resolve some conflicts, specially in i40e and vmxnet3, please verify
final patches.)