From: Stephen Hemminger <stephen@networkplumber.org>
To: dev@dpdk.org
Cc: Stephen Hemminger <stephen@networkplumber.org>,
Stephen Hemminger <sthemmin@microsoft.com>
Subject: [dpdk-dev] [RFC 01/14] ethdev: add link status read/write functions
Date: Fri, 14 Jul 2017 11:30:14 -0700 [thread overview]
Message-ID: <20170714183027.16021-2-stephen@networkplumber.org> (raw)
In-Reply-To: <20170714183027.16021-1-stephen@networkplumber.org>
Many drivers are all doing copy/paste of the same code to atomicly
update the link status. Reduce duplication, and allow for future
changes by having common function for this.
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
---
lib/librte_ether/rte_ethdev.c | 36 ++++++++++++++++++++++++++++++++++++
lib/librte_ether/rte_ethdev.h | 28 ++++++++++++++++++++++++++++
2 files changed, 64 insertions(+)
diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index a1b744704f3a..7532fc6b65f0 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1332,6 +1332,42 @@ rte_eth_link_get_nowait(uint8_t port_id, struct rte_eth_link *eth_link)
}
int
+_rte_eth_link_update(struct rte_eth_dev *dev,
+ const struct rte_eth_link *link)
+{
+ volatile struct rte_eth_link *dev_link = &(dev->data->dev_link);
+ struct rte_eth_link old;
+
+ RTE_BUILD_BUG_ON(sizeof(*link) != sizeof(uint64_t));
+
+ old = *dev_link;
+
+ /* Only reason we use cmpset rather than set is
+ * that on some architecture may use sign bit as a flag value.
+ */
+ while (rte_atomic64_cmpset((volatile uint64_t *)dev_link,
+ *(volatile uint64_t *)dev_link,
+ *(const uint64_t *)link) == 0)
+ continue;
+
+ return (old.link_status == link->link_status) ? -1 : 0;
+}
+
+void _rte_eth_link_read(struct rte_eth_dev *dev,
+ struct rte_eth_link *link)
+{
+ const uint64_t *src = (const uint64_t *)&(dev->data->dev_link);
+ volatile uint64_t *dst = (uint64_t *)link;
+
+ RTE_BUILD_BUG_ON(sizeof(*link) != sizeof(uint64_t));
+
+ /* Note: this should never fail since both destination and expected
+ * values are the same and are a pointer from caller.
+ */
+ rte_atomic64_cmpset(dst, *dst, *src);
+}
+
+int
rte_eth_stats_get(uint8_t port_id, struct rte_eth_stats *stats)
{
struct rte_eth_dev *dev;
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index f6837278521c..974657933f23 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -2219,6 +2219,34 @@ void rte_eth_link_get(uint8_t port_id, struct rte_eth_link *link);
*/
void rte_eth_link_get_nowait(uint8_t port_id, struct rte_eth_link *link);
+
+/**
+ * @internal
+ * Atomically write 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
+ * -1 if link state has changed, 0 if the same.
+ */
+int _rte_eth_link_update(struct rte_eth_dev *dev,
+ const struct rte_eth_link *link);
+
+/**
+ * @internal
+ * Atomically read the link speed and status.
+ * @param dev
+ * Pointer to struct rte_eth_dev.
+ * @param link
+ * link status value.
+ */
+void _rte_eth_link_read(struct rte_eth_dev *dev,
+ struct rte_eth_link *link);
+
/**
* Retrieve the general I/O statistics of an Ethernet device.
*
--
2.11.0
next prev parent reply other threads:[~2017-07-14 18:30 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-14 18:30 [dpdk-dev] [RFC 00/14] link status API improvement and bugfixes Stephen Hemminger
2017-07-14 18:30 ` Stephen Hemminger [this message]
2017-07-16 13:26 ` [dpdk-dev] [RFC 01/14] ethdev: add link status read/write functions Andrew Rybchenko
2017-07-17 15:58 ` Stephen Hemminger
2017-07-17 16:12 ` Andrew Rybchenko
2017-07-17 16:21 ` Stephen Hemminger
2017-07-17 16:31 ` Andrew Rybchenko
2017-10-11 8:32 ` Yang, Qiming
2017-10-13 15:12 ` Stephen Hemminger
2018-01-05 14:24 ` Thomas Monjalon
2018-01-05 20:15 ` Stephen Hemminger
2017-07-14 18:30 ` [dpdk-dev] [RFC 02/14] virtio: use eth_link_read/write (and bug fix) Stephen Hemminger
2017-07-16 12:33 ` Andrew Rybchenko
2017-07-17 16:01 ` Stephen Hemminger
2017-07-17 16:14 ` [dpdk-dev] ***Spam*** " Andrew Rybchenko
2017-07-17 16:28 ` [dpdk-dev] " Stephen Hemminger
2018-01-05 15:04 ` Thomas Monjalon
2017-07-14 18:30 ` [dpdk-dev] [RFC 03/14] bnxt: use rte_link_update Stephen Hemminger
2017-07-14 18:30 ` [dpdk-dev] [RFC 04/14] vmxnet3: use rte_eth_link_update Stephen Hemminger
2017-07-14 18:30 ` [dpdk-dev] [RFC 05/14] dpaa2: " Stephen Hemminger
2017-07-14 18:30 ` [dpdk-dev] [RFC 06/14] nfp: " Stephen Hemminger
2017-07-14 18:30 ` [dpdk-dev] [RFC 07/14] e1000: " Stephen Hemminger
2017-07-14 18:30 ` [dpdk-dev] [RFC 08/14] ixgbe: " Stephen Hemminger
2017-07-14 18:30 ` [dpdk-dev] [RFC 09/14] sfc: use new rte_eth_link helpers Stephen Hemminger
2017-07-16 13:48 ` Andrew Rybchenko
2017-07-17 16:02 ` Stephen Hemminger
2017-07-17 16:19 ` Andrew Rybchenko
2017-07-14 18:30 ` [dpdk-dev] [RFC 10/14] i40e: use rte_eth_link_update (and bug fix) Stephen Hemminger
2017-07-14 18:30 ` [dpdk-dev] [RFC 11/14] liquidio: use _rte_eth_link_update Stephen Hemminger
2017-07-18 10:17 ` Shijith Thotton
2017-07-14 18:30 ` [dpdk-dev] [RFC 12/14] thunderx: " Stephen Hemminger
2017-07-14 18:30 ` [dpdk-dev] [RFC 13/14] szedata: " Stephen Hemminger
2017-07-16 12:46 ` Andrew Rybchenko
2017-07-14 18:30 ` [dpdk-dev] [RFC 14/14] enic: " Stephen Hemminger
2017-07-16 13:55 ` [dpdk-dev] [RFC 00/14] link status API improvement and bugfixes Andrew Rybchenko
2018-01-05 14:29 ` Thomas Monjalon
2018-01-05 20:18 ` Stephen Hemminger
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