[PATCH 5/9] net: ethernet: ti: cpts: add return value to tx and rx timestamp funcitons

[Grygorii Strashko]

From: WingMan Kwok <w-kw...@ti.com>

Added return values in tx and rx timestamp funcitons facilitate the
possibililies of timestamping by CPSW modules other than CPTS, such as
packet accelerator on Keystone 2 devices.

Signed-off-by: WingMan Kwok <w-kw...@ti.com>
Signed-off-by: Grygorii Strashko <grygorii.stras...@ti.com>
---
 drivers/net/ethernet/ti/cpts.c | 16 ++++++++++------
 drivers/net/ethernet/ti/cpts.h | 11 +++++++----
 2 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/ti/cpts.c b/drivers/net/ethernet/ti/cpts.c
index 1ee64c6..970d4e2 100644
--- a/drivers/net/ethernet/ti/cpts.c
+++ b/drivers/net/ethernet/ti/cpts.c
@@ -302,34 +302,38 @@ static u64 cpts_find_ts(struct cpts *cpts, struct sk_buff 
*skb, int ev_type)
        return ns;
 }
 
-void cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb)
+int cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb)
 {
        u64 ns;
        struct skb_shared_hwtstamps *ssh;
 
        if (!cpts || !cpts->rx_enable)
-               return;
+               return -EPERM;
        ns = cpts_find_ts(cpts, skb, CPTS_EV_RX);
        if (!ns)
-               return;
+               return -ENOENT;
        ssh = skb_hwtstamps(skb);
        memset(ssh, 0, sizeof(*ssh));
        ssh->hwtstamp = ns_to_ktime(ns);
+
+       return 0;
 }
 
-void cpts_tx_timestamp(struct cpts *cpts, struct sk_buff *skb)
+int cpts_tx_timestamp(struct cpts *cpts, struct sk_buff *skb)
 {
        u64 ns;
        struct skb_shared_hwtstamps ssh;
 
        if (!cpts || !(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS))
-               return;
+               return -EPERM;
        ns = cpts_find_ts(cpts, skb, CPTS_EV_TX);
        if (!ns)
-               return;
+               return -ENOENT;
        memset(&ssh, 0, sizeof(ssh));
        ssh.hwtstamp = ns_to_ktime(ns);
        skb_tstamp_tx(skb, &ssh);
+
+       return 0;
 }
 
 int cpts_register(struct cpts *cpts)
diff --git a/drivers/net/ethernet/ti/cpts.h b/drivers/net/ethernet/ti/cpts.h
index a865193..47026ec 100644
--- a/drivers/net/ethernet/ti/cpts.h
+++ b/drivers/net/ethernet/ti/cpts.h
@@ -129,8 +129,8 @@ struct cpts {
        struct cpts_event pool_data[CPTS_MAX_EVENTS];
 };
 
-void cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb);
-void cpts_tx_timestamp(struct cpts *cpts, struct sk_buff *skb);
+int cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb);
+int cpts_tx_timestamp(struct cpts *cpts, struct sk_buff *skb);
 int cpts_register(struct cpts *cpts);
 void cpts_unregister(struct cpts *cpts);
 struct cpts *cpts_create(struct device *dev, void __iomem *regs,
@@ -162,11 +162,14 @@ static inline bool cpts_is_tx_enabled(struct cpts *cpts)
 #else
 struct cpts;
 
-static inline void cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb)
+static inline int cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb)
 {
+       return -EOPNOTSUPP;
 }
-static inline void cpts_tx_timestamp(struct cpts *cpts, struct sk_buff *skb)
+
+static inline int cpts_tx_timestamp(struct cpts *cpts, struct sk_buff *skb)
 {
+       return -EOPNOTSUPP;
 }
 
 static inline
-- 
2.9.3