Merge tag 'net-next-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next

Pull networking updates from Jakub Kicinski:

 - Add redirect_neigh() BPF packet redirect helper, allowing to limit
   stack traversal in common container configs and improving TCP
   back-pressure.

   Daniel reports ~10Gbps => ~15Gbps single stream TCP performance gain.

 - Expand netlink policy support and improve policy export to user
   space. (Ge)netlink core performs request validation according to
   declared policies. Expand the expressiveness of those policies
   (min/max length and bitmasks). Allow dumping policies for particular
   commands. This is used for feature discovery by user space (instead
   of kernel version parsing or trial and error).

 - Support IGMPv3/MLDv2 multicast listener discovery protocols in
   bridge.

 - Allow more than 255 IPv4 multicast interfaces.

 - Add support for Type of Service (ToS) reflection in SYN/SYN-ACK
   packets of TCPv6.

 - In Multi-patch TCP (MPTCP) support concurrent transmission of data on
   multiple subflows in a load balancing scenario. Enhance advertising
   addresses via the RM_ADDR/ADD_ADDR options.

 - Support SMC-Dv2 version of SMC, which enables multi-subnet
   deployments.

 - Allow more calls to same peer in RxRPC.

 - Support two new Controller Area Network (CAN) protocols - CAN-FD and
   ISO 15765-2:2016.

 - Add xfrm/IPsec compat layer, solving the 32bit user space on 64bit
   kernel problem.

 - Add TC actions for implementing MPLS L2 VPNs.

 - Improve nexthop code - e.g. handle various corner cases when nexthop
   objects are removed from groups better, skip unnecessary
   notifications and make it easier to offload nexthops into HW by
   converting to a blocking notifier.

 - Support adding and consuming TCP header options by BPF programs,
   opening the doors for easy experimental and deployment-specific TCP
   option use.

 - Reorganize TCP congestion control (CC) initialization to simplify
   life of TCP CC implemented in BPF.

 - Add support for shipping BPF programs with the kernel and loading
   them early on boot via the User Mode Driver mechanism, hence reusing
   all the user space infra we have.

 - Support sleepable BPF programs, initially targeting LSM and tracing.

 - Add bpf_d_path() helper for returning full path for given 'struct
   path'.

 - Make bpf_tail_call compatible with bpf-to-bpf calls.

 - Allow BPF programs to call map_update_elem on sockmaps.

 - Add BPF Type Format (BTF) support for type and enum discovery, as
   well as support for using BTF within the kernel itself (current use
   is for pretty printing structures).

 - Support listing and getting information about bpf_links via the bpf
   syscall.

 - Enhance kernel interfaces around NIC firmware update. Allow
   specifying overwrite mask to control if settings etc. are reset
   during update; report expected max time operation may take to users;
   support firmware activation without machine reboot incl. limits of
   how much impact reset may have (e.g. dropping link or not).

 - Extend ethtool configuration interface to report IEEE-standard
   counters, to limit the need for per-vendor logic in user space.

 - Adopt or extend devlink use for debug, monitoring, fw update in many
   drivers (dsa loop, ice, ionic, sja1105, qed, mlxsw, mv88e6xxx,
   dpaa2-eth).

 - In mlxsw expose critical and emergency SFP module temperature alarms.
   Refactor port buffer handling to make the defaults more suitable and
   support setting these values explicitly via the DCBNL interface.

 - Add XDP support for Intel's igb driver.

 - Support offloading TC flower classification and filtering rules to
   mscc_ocelot switches.

 - Add PTP support for Marvell Octeontx2 and PP2.2 hardware, as well as
   fixed interval period pulse generator and one-step timestamping in
   dpaa-eth.

 - Add support for various auth offloads in WiFi APs, e.g. SAE (WPA3)
   offload.

 - Add Lynx PHY/PCS MDIO module, and convert various drivers which have
   this HW to use it. Convert mvpp2 to split PCS.

 - Support Marvell Prestera 98DX3255 24-port switch ASICs, as well as
   7-port Mediatek MT7531 IP.

 - Add initial support for QCA6390 and IPQ6018 in ath11k WiFi driver,
   and wcn3680 support in wcn36xx.

 - Improve performance for packets which don't require much offloads on
   recent Mellanox NICs by 20% by making multiple packets share a
   descriptor entry.

 - Move chelsio inline crypto drivers (for TLS and IPsec) from the
   crypto subtree to drivers/net. Move MDIO drivers out of the phy
   directory.

 - Clean up a lot of W=1 warnings, reportedly the actively developed
   subsections of networking drivers should now build W=1 warning free.

 - Make sure drivers don't use in_interrupt() to dynamically adapt their
   code. Convert tasklets to use new tasklet_setup API (sadly this
   conversion is not yet complete).

* tag 'net-next-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (2583 commits)
  Revert "bpfilter: Fix build error with CONFIG_BPFILTER_UMH"
  net, sockmap: Don't call bpf_prog_put() on NULL pointer
  bpf, selftest: Fix flaky tcp_hdr_options test when adding addr to lo
  bpf, sockmap: Add locking annotations to iterator
  netfilter: nftables: allow re-computing sctp CRC-32C in 'payload' statements
  net: fix pos incrementment in ipv6_route_seq_next
  net/smc: fix invalid return code in smcd_new_buf_create()
  net/smc: fix valid DMBE buffer sizes
  net/smc: fix use-after-free of delayed events
  bpfilter: Fix build error with CONFIG_BPFILTER_UMH
  cxgb4/ch_ipsec: Replace the module name to ch_ipsec from chcr
  net: sched: Fix suspicious RCU usage while accessing tcf_tunnel_info
  bpf: Fix register equivalence tracking.
  rxrpc: Fix loss of final ack on shutdown
  rxrpc: Fix bundle counting for exclusive connections
  netfilter: restore NF_INET_NUMHOOKS
  ibmveth: Identify ingress large send packets.
  ibmveth: Switch order of ibmveth_helper calls.
  cxgb4: handle 4-tuple PEDIT to NAT mode translation
  selftests: Add VRF route leaking tests
  ...

7 files changed, 91 insertions, 61 deletions

diff --git a/drivers/net/ethernet/intel/igc/igc.h b/drivers/net/ethernet/intel/igc/igc.h
index 2d566f3c827b..35baae900c1f 100644
--- a/drivers/net/ethernet/intel/igc/igc.h
+++ b/drivers/net/ethernet/intel/igc/igc.h
@@ -215,6 +215,8 @@ struct igc_adapter {
 	spinlock_t tmreg_lock;
 	struct cyclecounter cc;
 	struct timecounter tc;
+	struct timespec64 prev_ptp_time; /* Pre-reset PTP clock */
+	ktime_t ptp_reset_start; /* Reset time in clock mono */
 };
 
 void igc_up(struct igc_adapter *adapter);
@@ -548,6 +550,7 @@ void igc_ptp_rx_pktstamp(struct igc_q_vector *q_vector, void *va,
 int igc_ptp_set_ts_config(struct net_device *netdev, struct ifreq *ifr);
 int igc_ptp_get_ts_config(struct net_device *netdev, struct ifreq *ifr);
 void igc_ptp_tx_hang(struct igc_adapter *adapter);
+void igc_ptp_read(struct igc_adapter *adapter, struct timespec64 *ts);
 
 #define igc_rx_pg_size(_ring) (PAGE_SIZE << igc_rx_pg_order(_ring))
 
diff --git a/drivers/net/ethernet/intel/igc/igc_base.c b/drivers/net/ethernet/intel/igc/igc_base.c
index cc5a6cf531c7..fd37d2c203af 100644
--- a/drivers/net/ethernet/intel/igc/igc_base.c
+++ b/drivers/net/ethernet/intel/igc/igc_base.c
@@ -215,6 +215,11 @@ static s32 igc_get_invariants_base(struct igc_hw *hw)
 	case IGC_DEV_ID_I225_K2:
 	case IGC_DEV_ID_I225_LMVP:
 	case IGC_DEV_ID_I225_IT:
+	case IGC_DEV_ID_I226_LM:
+	case IGC_DEV_ID_I226_V:
+	case IGC_DEV_ID_I226_IT:
+	case IGC_DEV_ID_I221_V:
+	case IGC_DEV_ID_I226_BLANK_NVM:
 	case IGC_DEV_ID_I225_BLANK_NVM:
 		mac->type = igc_i225;
 		break;
diff --git a/drivers/net/ethernet/intel/igc/igc_defines.h b/drivers/net/ethernet/intel/igc/igc_defines.h
index f1f464967f87..32f5fd684139 100644
--- a/drivers/net/ethernet/intel/igc/igc_defines.h
+++ b/drivers/net/ethernet/intel/igc/igc_defines.h
@@ -324,22 +324,10 @@
 /* Advanced Receive Descriptor bit definitions */
 #define IGC_RXDADV_STAT_TSIP	0x08000 /* timestamp in packet */
 
-#define IGC_RXDEXT_STATERR_CE		0x01000000
-#define IGC_RXDEXT_STATERR_SE		0x02000000
-#define IGC_RXDEXT_STATERR_SEQ		0x04000000
-#define IGC_RXDEXT_STATERR_CXE		0x10000000
-#define IGC_RXDEXT_STATERR_TCPE		0x20000000
+#define IGC_RXDEXT_STATERR_L4E		0x20000000
 #define IGC_RXDEXT_STATERR_IPE		0x40000000
 #define IGC_RXDEXT_STATERR_RXE		0x80000000
 
-/* Same mask, but for extended and packet split descriptors */
-#define IGC_RXDEXT_ERR_FRAME_ERR_MASK ( \
-	IGC_RXDEXT_STATERR_CE  |	\
-	IGC_RXDEXT_STATERR_SE  |	\
-	IGC_RXDEXT_STATERR_SEQ |	\
-	IGC_RXDEXT_STATERR_CXE |	\
-	IGC_RXDEXT_STATERR_RXE)
-
 #define IGC_MRQC_RSS_FIELD_IPV4_TCP	0x00010000
 #define IGC_MRQC_RSS_FIELD_IPV4		0x00020000
 #define IGC_MRQC_RSS_FIELD_IPV6_TCP_EX	0x00040000
@@ -409,7 +397,7 @@
 #define IGC_IMIREXT_SIZE_BP	0x00001000  /* Packet size bypass */
 
 /* Time Sync Transmit Control bit definitions */
-#define IGC_TSYNCTXCTL_VALID			0x00000001  /* Tx timestamp valid */
+#define IGC_TSYNCTXCTL_TXTT_0			0x00000001  /* Tx timestamp reg 0 valid */
 #define IGC_TSYNCTXCTL_ENABLED			0x00000010  /* enable Tx timestamping */
 #define IGC_TSYNCTXCTL_MAX_ALLOWED_DLY_MASK	0x0000F000  /* max delay */
 #define IGC_TSYNCTXCTL_SYNC_COMP_ERR		0x20000000  /* sync err */
diff --git a/drivers/net/ethernet/intel/igc/igc_ethtool.c b/drivers/net/ethernet/intel/igc/igc_ethtool.c
index 44410c2265d6..61d331ce38cd 100644
--- a/drivers/net/ethernet/intel/igc/igc_ethtool.c
+++ b/drivers/net/ethernet/intel/igc/igc_ethtool.c
@@ -321,6 +321,9 @@ static void igc_ethtool_get_regs(struct net_device *netdev,
 
 	for (i = 0; i < 8; i++)
 		regs_buff[205 + i] = rd32(IGC_ETQF(i));
+
+	regs_buff[213] = adapter->stats.tlpic;
+	regs_buff[214] = adapter->stats.rlpic;
 }
 
 static void igc_ethtool_get_wol(struct net_device *netdev,
diff --git a/drivers/net/ethernet/intel/igc/igc_hw.h b/drivers/net/ethernet/intel/igc/igc_hw.h
index b9fe51b91c47..55dae7c4703f 100644
--- a/drivers/net/ethernet/intel/igc/igc_hw.h
+++ b/drivers/net/ethernet/intel/igc/igc_hw.h
@@ -24,6 +24,11 @@
 #define IGC_DEV_ID_I225_K2			0x3101
 #define IGC_DEV_ID_I225_LMVP			0x5502
 #define IGC_DEV_ID_I225_IT			0x0D9F
+#define IGC_DEV_ID_I226_LM			0x125B
+#define IGC_DEV_ID_I226_V			0x125C
+#define IGC_DEV_ID_I226_IT			0x125D
+#define IGC_DEV_ID_I221_V			0x125E
+#define IGC_DEV_ID_I226_BLANK_NVM		0x125F
 #define IGC_DEV_ID_I225_BLANK_NVM		0x15FD
 
 /* Function pointers for the MAC. */
@@ -125,9 +130,6 @@ struct igc_nvm_info {
 	struct igc_nvm_operations ops;
 	enum igc_nvm_type type;
 
-	u32 flash_bank_size;
-	u32 flash_base_addr;
-
 	u16 word_size;
 	u16 delay_usec;
 	u16 address_bits;
@@ -153,7 +155,6 @@ struct igc_phy_info {
 	u8 mdix;
 
 	bool is_mdix;
-	bool reset_disable;
 	bool speed_downgraded;
 	bool autoneg_wait_to_complete;
 };
@@ -239,6 +240,8 @@ struct igc_hw_stats {
 	u64 prc511;
 	u64 prc1023;
 	u64 prc1522;
+	u64 tlpic;
+	u64 rlpic;
 	u64 gprc;
 	u64 bprc;
 	u64 mprc;
diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index 9593aa4eea36..9112dff075cf 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -47,6 +47,11 @@ static const struct pci_device_id igc_pci_tbl[] = {
 	{ PCI_VDEVICE(INTEL, IGC_DEV_ID_I225_K2), board_base },
 	{ PCI_VDEVICE(INTEL, IGC_DEV_ID_I225_LMVP), board_base },
 	{ PCI_VDEVICE(INTEL, IGC_DEV_ID_I225_IT), board_base },
+	{ PCI_VDEVICE(INTEL, IGC_DEV_ID_I226_LM), board_base },
+	{ PCI_VDEVICE(INTEL, IGC_DEV_ID_I226_V), board_base },
+	{ PCI_VDEVICE(INTEL, IGC_DEV_ID_I226_IT), board_base },
+	{ PCI_VDEVICE(INTEL, IGC_DEV_ID_I221_V), board_base },
+	{ PCI_VDEVICE(INTEL, IGC_DEV_ID_I226_BLANK_NVM), board_base },
 	{ PCI_VDEVICE(INTEL, IGC_DEV_ID_I225_BLANK_NVM), board_base },
 	/* required last entry */
 	{0, }
@@ -1428,7 +1433,7 @@ static void igc_rx_checksum(struct igc_ring *ring,
 
 	/* TCP/UDP checksum error bit is set */
 	if (igc_test_staterr(rx_desc,
-			     IGC_RXDEXT_STATERR_TCPE |
+			     IGC_RXDEXT_STATERR_L4E |
 			     IGC_RXDEXT_STATERR_IPE)) {
 		/* work around errata with sctp packets where the TCPE aka
 		 * L4E bit is set incorrectly on 64 byte (60 byte w/o crc)
@@ -1550,10 +1555,7 @@ static struct sk_buff *igc_build_skb(struct igc_ring *rx_ring,
 	struct sk_buff *skb;
 
 	/* prefetch first cache line of first page */
-	prefetch(va);
-#if L1_CACHE_BYTES < 128
-	prefetch(va + L1_CACHE_BYTES);
-#endif
+	net_prefetch(va);
 
 	/* build an skb around the page buffer */
 	skb = build_skb(va - IGC_SKB_PAD, truesize);
@@ -1589,10 +1591,7 @@ static struct sk_buff *igc_construct_skb(struct igc_ring *rx_ring,
 	struct sk_buff *skb;
 
 	/* prefetch first cache line of first page */
-	prefetch(va);
-#if L1_CACHE_BYTES < 128
-	prefetch(va + L1_CACHE_BYTES);
-#endif
+	net_prefetch(va);
 
 	/* allocate a skb to store the frags */
 	skb = napi_alloc_skb(&rx_ring->q_vector->napi, IGC_RX_HDR_LEN);
@@ -1743,8 +1742,7 @@ static bool igc_cleanup_headers(struct igc_ring *rx_ring,
 				union igc_adv_rx_desc *rx_desc,
 				struct sk_buff *skb)
 {
-	if (unlikely((igc_test_staterr(rx_desc,
-				       IGC_RXDEXT_ERR_FRAME_ERR_MASK)))) {
+	if (unlikely(igc_test_staterr(rx_desc, IGC_RXDEXT_STATERR_RXE))) {
 		struct net_device *netdev = rx_ring->netdev;
 
 		if (!(netdev->features & NETIF_F_RXALL)) {
@@ -3685,6 +3683,8 @@ void igc_update_stats(struct igc_adapter *adapter)
 	adapter->stats.prc511 += rd32(IGC_PRC511);
 	adapter->stats.prc1023 += rd32(IGC_PRC1023);
 	adapter->stats.prc1522 += rd32(IGC_PRC1522);
+	adapter->stats.tlpic += rd32(IGC_TLPIC);
+	adapter->stats.rlpic += rd32(IGC_RLPIC);
 
 	mpc = rd32(IGC_MPC);
 	adapter->stats.mpc += mpc;
@@ -3778,6 +3778,8 @@ void igc_down(struct igc_adapter *adapter)
 
 	set_bit(__IGC_DOWN, &adapter->state);
 
+	igc_ptp_suspend(adapter);
+
 	/* disable receives in the hardware */
 	rctl = rd32(IGC_RCTL);
 	wr32(IGC_RCTL, rctl & ~IGC_RCTL_EN);
@@ -3831,7 +3833,6 @@ void igc_down(struct igc_adapter *adapter)
 
 void igc_reinit_locked(struct igc_adapter *adapter)
 {
-	WARN_ON(in_interrupt());
 	while (test_and_set_bit(__IGC_RESETTING, &adapter->state))
 		usleep_range(1000, 2000);
 	igc_down(adapter);
@@ -4659,7 +4660,7 @@ int igc_close(struct net_device *netdev)
 /**
  * igc_ioctl - Access the hwtstamp interface
  * @netdev: network interface device structure
- * @ifreq: interface request data
+ * @ifr: interface request data
  * @cmd: ioctl command
  **/
 static int igc_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
@@ -4700,14 +4701,35 @@ static int igc_save_launchtime_params(struct igc_adapter *adapter, int queue,
 	return 0;
 }
 
-static bool validate_schedule(const struct tc_taprio_qopt_offload *qopt)
+static bool is_base_time_past(ktime_t base_time, const struct timespec64 *now)
+{
+	struct timespec64 b;
+
+	b = ktime_to_timespec64(base_time);
+
+	return timespec64_compare(now, &b) > 0;
+}
+
+static bool validate_schedule(struct igc_adapter *adapter,
+			      const struct tc_taprio_qopt_offload *qopt)
 {
 	int queue_uses[IGC_MAX_TX_QUEUES] = { };
+	struct timespec64 now;
 	size_t n;
 
 	if (qopt->cycle_time_extension)
 		return false;
 
+	igc_ptp_read(adapter, &now);
+
+	/* If we program the controller's BASET registers with a time
+	 * in the future, it will hold all the packets until that
+	 * time, causing a lot of TX Hangs, so to avoid that, we
+	 * reject schedules that would start in the future.
+	 */
+	if (!is_base_time_past(qopt->base_time, &now))
+		return false;
+
 	for (n = 0; n < qopt->num_entries; n++) {
 		const struct tc_taprio_sched_entry *e;
 		int i;
@@ -4762,7 +4784,7 @@ static int igc_save_qbv_schedule(struct igc_adapter *adapter,
 	if (adapter->base_time)
 		return -EALREADY;
 
-	if (!validate_schedule(qopt))
+	if (!validate_schedule(adapter, qopt))
 		return -EINVAL;
 
 	adapter->cycle_time = qopt->cycle_time;
diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c b/drivers/net/ethernet/intel/igc/igc_ptp.c
index 6a9b5102aa55..ac0b9c85da7c 100644
--- a/drivers/net/ethernet/intel/igc/igc_ptp.c
+++ b/drivers/net/ethernet/intel/igc/igc_ptp.c
@@ -8,6 +8,7 @@
 #include <linux/pci.h>
 #include <linux/ptp_classify.h>
 #include <linux/clocksource.h>
+#include <linux/ktime.h>
 
 #define INCVALUE_MASK		0x7fffffff
 #define ISGN			0x80000000
@@ -16,17 +17,12 @@
 #define IGC_PTP_TX_TIMEOUT		(HZ * 15)
 
 /* SYSTIM read access for I225 */
-static void igc_ptp_read_i225(struct igc_adapter *adapter,
-			      struct timespec64 *ts)
+void igc_ptp_read(struct igc_adapter *adapter, struct timespec64 *ts)
 {
 	struct igc_hw *hw = &adapter->hw;
 	u32 sec, nsec;
 
-	/* The timestamp latches on lowest register read. For I210/I211, the
-	 * lowest register is SYSTIMR. Since we only need to provide nanosecond
-	 * resolution, we can ignore it.
-	 */
-	rd32(IGC_SYSTIMR);
+	/* The timestamp is latched when SYSTIML is read. */
 	nsec = rd32(IGC_SYSTIML);
 	sec = rd32(IGC_SYSTIMH);
 
@@ -39,9 +35,6 @@ static void igc_ptp_write_i225(struct igc_adapter *adapter,
 {
 	struct igc_hw *hw = &adapter->hw;
 
-	/* Writing the SYSTIMR register is not necessary as it only
-	 * provides sub-nanosecond resolution.
-	 */
 	wr32(IGC_SYSTIML, ts->tv_nsec);
 	wr32(IGC_SYSTIMH, ts->tv_sec);
 }
@@ -81,7 +74,7 @@ static int igc_ptp_adjtime_i225(struct ptp_clock_info *ptp, s64 delta)
 
 	spin_lock_irqsave(&igc->tmreg_lock, flags);
 
-	igc_ptp_read_i225(igc, &now);
+	igc_ptp_read(igc, &now);
 	now = timespec64_add(now, then);
 	igc_ptp_write_i225(igc, (const struct timespec64 *)&now);
 
@@ -102,10 +95,9 @@ static int igc_ptp_gettimex64_i225(struct ptp_clock_info *ptp,
 	spin_lock_irqsave(&igc->tmreg_lock, flags);
 
 	ptp_read_system_prets(sts);
-	rd32(IGC_SYSTIMR);
-	ptp_read_system_postts(sts);
 	ts->tv_nsec = rd32(IGC_SYSTIML);
 	ts->tv_sec = rd32(IGC_SYSTIMH);
+	ptp_read_system_postts(sts);
 
 	spin_unlock_irqrestore(&igc->tmreg_lock, flags);
 
@@ -422,24 +414,17 @@ static void igc_ptp_tx_work(struct work_struct *work)
 	if (!test_bit(__IGC_PTP_TX_IN_PROGRESS, &adapter->state))
 		return;
 
-	if (time_is_before_jiffies(adapter->ptp_tx_start +
-				   IGC_PTP_TX_TIMEOUT)) {
-		igc_ptp_tx_timeout(adapter);
+	tsynctxctl = rd32(IGC_TSYNCTXCTL);
+	if (WARN_ON_ONCE(!(tsynctxctl & IGC_TSYNCTXCTL_TXTT_0)))
 		return;
-	}
 
-	tsynctxctl = rd32(IGC_TSYNCTXCTL);
-	if (tsynctxctl & IGC_TSYNCTXCTL_VALID)
-		igc_ptp_tx_hwtstamp(adapter);
-	else
-		/* reschedule to check later */
-		schedule_work(&adapter->ptp_tx_work);
+	igc_ptp_tx_hwtstamp(adapter);
 }
 
 /**
  * igc_ptp_set_ts_config - set hardware time stamping config
  * @netdev: network interface device structure
- * @ifreq: interface request data
+ * @ifr: interface request data
  *
  **/
 int igc_ptp_set_ts_config(struct net_device *netdev, struct ifreq *ifr)
@@ -466,7 +451,7 @@ int igc_ptp_set_ts_config(struct net_device *netdev, struct ifreq *ifr)
 /**
  * igc_ptp_get_ts_config - get hardware time stamping config
  * @netdev: network interface device structure
- * @ifreq: interface request data
+ * @ifr: interface request data
  *
  * Get the hwtstamp_config settings to return to the user. Rather than attempt
  * to deconstruct the settings from the registers, just return a shadow copy
@@ -515,6 +500,9 @@ void igc_ptp_init(struct igc_adapter *adapter)
 	adapter->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
 	adapter->tstamp_config.tx_type = HWTSTAMP_TX_OFF;
 
+	adapter->prev_ptp_time = ktime_to_timespec64(ktime_get_real());
+	adapter->ptp_reset_start = ktime_get();
+
 	adapter->ptp_clock = ptp_clock_register(&adapter->ptp_caps,
 						&adapter->pdev->dev);
 	if (IS_ERR(adapter->ptp_clock)) {
@@ -526,6 +514,24 @@ void igc_ptp_init(struct igc_adapter *adapter)
 	}
 }
 
+static void igc_ptp_time_save(struct igc_adapter *adapter)
+{
+	igc_ptp_read(adapter, &adapter->prev_ptp_time);
+	adapter->ptp_reset_start = ktime_get();
+}
+
+static void igc_ptp_time_restore(struct igc_adapter *adapter)
+{
+	struct timespec64 ts = adapter->prev_ptp_time;
+	ktime_t delta;
+
+	delta = ktime_sub(ktime_get(), adapter->ptp_reset_start);
+
+	timespec64_add_ns(&ts, ktime_to_ns(delta));
+
+	igc_ptp_write_i225(adapter, &ts);
+}
+
 /**
  * igc_ptp_suspend - Disable PTP work items and prepare for suspend
  * @adapter: Board private structure
@@ -542,6 +548,8 @@ void igc_ptp_suspend(struct igc_adapter *adapter)
 	dev_kfree_skb_any(adapter->ptp_tx_skb);
 	adapter->ptp_tx_skb = NULL;
 	clear_bit_unlock(__IGC_PTP_TX_IN_PROGRESS, &adapter->state);
+
+	igc_ptp_time_save(adapter);
 }
 
 /**
@@ -591,9 +599,7 @@ void igc_ptp_reset(struct igc_adapter *adapter)
 
 	/* Re-initialize the timer. */
 	if (hw->mac.type == igc_i225) {
-		struct timespec64 ts64 = ktime_to_timespec64(ktime_get_real());
-
-		igc_ptp_write_i225(adapter, &ts64);
+		igc_ptp_time_restore(adapter);
 	} else {
 		timecounter_init(&adapter->tc, &adapter->cc,
 				 ktime_to_ns(ktime_get_real()));