netdev - [PATCH v1 3/4] net: sock: extend SO

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Date:   Tue, 27 Sep 2022 21:06:55 +0800
From:   Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@...el.com>
To:     intel-wired-lan@...osl.org
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        edumazet@...gle.com, muhammad.husaini.zulkifli@...el.com,
        vinicius.gomes@...el.com, aravindhan.gunasekaran@...el.com,
        noor.azura.ahmad.tarmizi@...el.com
Subject: [PATCH v1 3/4] net: sock: extend SO_TIMESTAMPING for DMA Fetch

This patch is to extend SO_TIMESTAMPING API to support the DMA Time
Stamp by adding a new flag SOF_TIMESTAMPING_TX_HARDWARE_DMA_FETCH.
User space application can configure this flag into hwtstamp_config flag
if require to use the DMA Time Stamp for that socket application.

Suggested-by: Vinicius Costa Gomes <vinicius.gomes@...el.com>
Signed-off-by: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@...el.com>
---
 include/linux/skbuff.h          | 3 +++
 include/uapi/linux/net_tstamp.h | 6 ++++--
 net/ethtool/common.c            | 1 +
 net/socket.c                    | 3 +++
 4 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index f15d5b62539b..7a79ffa7799d 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -485,6 +485,9 @@ enum {
 
 	/* generate software time stamp when entering packet scheduling */
 	SKBTX_SCHED_TSTAMP = 1 << 6,
+
+	/* generate hardware DMA time stamp */
+	SKBTX_HW_DMA_TSTAMP = 1 << 7,
 };
 
 #define SKBTX_ANY_SW_TSTAMP	(SKBTX_SW_TSTAMP    | \
diff --git a/include/uapi/linux/net_tstamp.h b/include/uapi/linux/net_tstamp.h
index 4966d5ca521f..c9e113cea883 100644
--- a/include/uapi/linux/net_tstamp.h
+++ b/include/uapi/linux/net_tstamp.h
@@ -31,8 +31,9 @@ enum {
 	SOF_TIMESTAMPING_OPT_PKTINFO = (1<<13),
 	SOF_TIMESTAMPING_OPT_TX_SWHW = (1<<14),
 	SOF_TIMESTAMPING_BIND_PHC = (1 << 15),
+	SOF_TIMESTAMPING_TX_HARDWARE_DMA_FETCH = (1 << 16),
 
-	SOF_TIMESTAMPING_LAST = SOF_TIMESTAMPING_BIND_PHC,
+	SOF_TIMESTAMPING_LAST = SOF_TIMESTAMPING_TX_HARDWARE_DMA_FETCH,
 	SOF_TIMESTAMPING_MASK = (SOF_TIMESTAMPING_LAST - 1) |
 				 SOF_TIMESTAMPING_LAST
 };
@@ -45,7 +46,8 @@ enum {
 #define SOF_TIMESTAMPING_TX_RECORD_MASK	(SOF_TIMESTAMPING_TX_HARDWARE | \
 					 SOF_TIMESTAMPING_TX_SOFTWARE | \
 					 SOF_TIMESTAMPING_TX_SCHED | \
-					 SOF_TIMESTAMPING_TX_ACK)
+					 SOF_TIMESTAMPING_TX_ACK | \
+					 SOF_TIMESTAMPING_TX_HARDWARE_DMA_FETCH)
 
 /**
  * struct so_timestamping - SO_TIMESTAMPING parameter
diff --git a/net/ethtool/common.c b/net/ethtool/common.c
index f2a178d162ef..24f8e7f9b4a5 100644
--- a/net/ethtool/common.c
+++ b/net/ethtool/common.c
@@ -403,6 +403,7 @@ const char sof_timestamping_names[][ETH_GSTRING_LEN] = {
 	[const_ilog2(SOF_TIMESTAMPING_OPT_PKTINFO)]  = "option-pktinfo",
 	[const_ilog2(SOF_TIMESTAMPING_OPT_TX_SWHW)]  = "option-tx-swhw",
 	[const_ilog2(SOF_TIMESTAMPING_BIND_PHC)]     = "bind-phc",
+	[const_ilog2(SOF_TIMESTAMPING_TX_HARDWARE_DMA_FETCH)]	= "hardware-dma-transmit",
 };
 static_assert(ARRAY_SIZE(sof_timestamping_names) == __SOF_TIMESTAMPING_CNT);
 
diff --git a/net/socket.c b/net/socket.c
index 34ddb5d6889e..dfb9fa693a11 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -695,6 +695,9 @@ void __sock_tx_timestamp(__u32 tsflags, __u8 *tx_flags)
 			flags |= SKBTX_HW_TSTAMP_USE_CYCLES;
 	}
 
+	if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE_DMA_FETCH)
+		flags |= SKBTX_HW_DMA_TSTAMP;
+
 	if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE)
 		flags |= SKBTX_SW_TSTAMP;
 
-- 
2.17.1