[net-next 0/9][pull request] 40GbE Intel Wired LAN Driver Updates 2018-05-22

[net-next 0/9][pull request] 40GbE Intel Wired LAN Driver Updates 2018-05-22

[Jeff Kirsher]

This series contains updates to i40e only.

Jake provides all the changes in this series starting with making it
consistent in how we approach the bit lock.  Fixed the reporting of the
VEB statistics and the queue statistics to always return every queue
even if it is not currently in use.  Use WARN_ONCE() so that the first
time we end up with an incorrect size we will dump a stack trace and a
message to help highlight the issue early in testing.  Folded the fixed
string prefix into the stat string definition.  Instead of using a
separate char *p pointer when copying strings, use the data pointer
directly.  Added code comments for several of the statistic functions to
better explain the number and ordering of statistics.

The following are changes since commit e3bb946cd922b773fdc03252aefbf2472d1d530c:
  Merge branch 'TI-Ethernet-driver-warnings-fixes'
and are available in the git repository at:
  git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/next-queue 40GbE

Jacob Keller (9):
  i40e: free skb after clearing lock in ptp_stop
  i40e: always return VEB stat strings
  i40e: always return all queue stat strings
  i40e: split i40e_get_strings() into smaller functions
  i40e: use WARN_ONCE to replace the commented BUG_ON size check
  i40e: fold prefix strings directly into stat names
  i40e: update data pointer directly when copying to the buffer
  i40e: add function doc headers for ethtool stats functions
  i40e: use the more traditional 'i' loop variable

 .../net/ethernet/intel/i40e/i40e_ethtool.c    | 459 ++++++++++--------
 drivers/net/ethernet/intel/i40e/i40e_ptp.c    |   4 +-
 2 files changed, 264 insertions(+), 199 deletions(-)

-- 
2.17.0

[net-next 1/9] i40e: free skb after clearing lock in ptp_stop

[Jeff Kirsher]

From: Jacob Keller <jacob.e.keller@intel.com>

Use the same logic to free the skb after clearing the Tx timestamp bit
lock in i40e_ptp_stop as we use in the other locations. It is not as
important here since we are not racing against a future Tx timestamp
request (as we are disabling PTP at this point). However it is good to
be consistent in how we approach the bit lock so that future callers
don't copy the old anti-pattern.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e_ptp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ptp.c b/drivers/net/ethernet/intel/i40e/i40e_ptp.c
index d50d84927e6b..35f2866b38c6 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ptp.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ptp.c
@@ -799,9 +799,11 @@ void i40e_ptp_stop(struct i40e_pf *pf)
 	pf->ptp_rx = false;
 
 	if (pf->ptp_tx_skb) {
-		dev_kfree_skb_any(pf->ptp_tx_skb);
+		struct sk_buff *skb = pf->ptp_tx_skb;
+
 		pf->ptp_tx_skb = NULL;
 		clear_bit_unlock(__I40E_PTP_TX_IN_PROGRESS, pf->state);
+		dev_kfree_skb_any(skb);
 	}
 
 	if (pf->ptp_clock) {
-- 
2.17.0

[net-next 2/9] i40e: always return VEB stat strings

[Jeff Kirsher]

From: Jacob Keller <jacob.e.keller@intel.com>

The ethtool API for obtaining device statistics is not intended to allow
runtime changes in the number of statistics reported. It may *appear*
this way, as there is an ability to request the number of stats using
ethtool_get_set_count(). However, it is expected that this must always
return the same value for invocations of the same device.

If we don't satisfy this contract, and allow the number of stats to
change during run time, we could cause invalid memory accesses or report
the stat strings incorrectly. This is because the API for obtaining
stats is to (1) get the size, (2) get the strings and finally (3) get
the stats. Since these are each separate ethtool op commands, it is not
possible to maintain consistency by holding the RTNL lock over the whole
operation. This results in the potential for a race condition to occur
where the size changed between any of the 3 calls.

Avoid this issue by requiring that we always return the same value for
a given device. We can check any values which remain constant for the
life of the device, but must not report different sizes depending on
runtime attributes.

This patch specifically fixes the VEB statistics strings to always be
reported. Other issues will be fixed in future patches.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 .../net/ethernet/intel/i40e/i40e_ethtool.c    | 52 ++++++++-----------
 1 file changed, 23 insertions(+), 29 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index 329e59eae4a1..de5dad7ff340 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -1661,15 +1661,10 @@ static int i40e_get_stats_count(struct net_device *netdev)
 	struct i40e_vsi *vsi = np->vsi;
 	struct i40e_pf *pf = vsi->back;
 
-	if (vsi == pf->vsi[pf->lan_vsi] && pf->hw.partition_id == 1) {
-		if (pf->lan_veb != I40E_NO_VEB &&
-		    pf->flags & I40E_FLAG_VEB_STATS_ENABLED)
-			return I40E_PF_STATS_LEN(netdev) + I40E_VEB_STATS_TOTAL;
-		else
-			return I40E_PF_STATS_LEN(netdev);
-	} else {
+	if (vsi == pf->vsi[pf->lan_vsi] && pf->hw.partition_id == 1)
+		return I40E_PF_STATS_LEN(netdev) + I40E_VEB_STATS_TOTAL;
+	else
 		return I40E_VSI_STATS_LEN(netdev);
-	}
 }
 
 static int i40e_get_sset_count(struct net_device *netdev, int sset)
@@ -1760,6 +1755,8 @@ static void i40e_get_ethtool_stats(struct net_device *netdev,
 			data[i++] = veb->tc_stats.tc_rx_packets[j];
 			data[i++] = veb->tc_stats.tc_rx_bytes[j];
 		}
+	} else {
+		i += I40E_VEB_STATS_TOTAL;
 	}
 	for (j = 0; j < I40E_GLOBAL_STATS_LEN; j++) {
 		p = (char *)pf + i40e_gstrings_stats[j].stat_offset;
@@ -1816,27 +1813,24 @@ static void i40e_get_strings(struct net_device *netdev, u32 stringset,
 		if (vsi != pf->vsi[pf->lan_vsi] || pf->hw.partition_id != 1)
 			return;
 
-		if ((pf->lan_veb != I40E_NO_VEB) &&
-		    (pf->flags & I40E_FLAG_VEB_STATS_ENABLED)) {
-			for (i = 0; i < I40E_VEB_STATS_LEN; i++) {
-				snprintf(p, ETH_GSTRING_LEN, "veb.%s",
-					i40e_gstrings_veb_stats[i].stat_string);
-				p += ETH_GSTRING_LEN;
-			}
-			for (i = 0; i < I40E_MAX_TRAFFIC_CLASS; i++) {
-				snprintf(p, ETH_GSTRING_LEN,
-					 "veb.tc_%d_tx_packets", i);
-				p += ETH_GSTRING_LEN;
-				snprintf(p, ETH_GSTRING_LEN,
-					 "veb.tc_%d_tx_bytes", i);
-				p += ETH_GSTRING_LEN;
-				snprintf(p, ETH_GSTRING_LEN,
-					 "veb.tc_%d_rx_packets", i);
-				p += ETH_GSTRING_LEN;
-				snprintf(p, ETH_GSTRING_LEN,
-					 "veb.tc_%d_rx_bytes", i);
-				p += ETH_GSTRING_LEN;
-			}
+		for (i = 0; i < I40E_VEB_STATS_LEN; i++) {
+			snprintf(p, ETH_GSTRING_LEN, "veb.%s",
+				 i40e_gstrings_veb_stats[i].stat_string);
+			p += ETH_GSTRING_LEN;
+		}
+		for (i = 0; i < I40E_MAX_TRAFFIC_CLASS; i++) {
+			snprintf(p, ETH_GSTRING_LEN,
+				 "veb.tc_%u_tx_packets", i);
+			p += ETH_GSTRING_LEN;
+			snprintf(p, ETH_GSTRING_LEN,
+				 "veb.tc_%u_tx_bytes", i);
+			p += ETH_GSTRING_LEN;
+			snprintf(p, ETH_GSTRING_LEN,
+				 "veb.tc_%u_rx_packets", i);
+			p += ETH_GSTRING_LEN;
+			snprintf(p, ETH_GSTRING_LEN,
+				 "veb.tc_%u_rx_bytes", i);
+			p += ETH_GSTRING_LEN;
 		}
 		for (i = 0; i < I40E_GLOBAL_STATS_LEN; i++) {
 			snprintf(p, ETH_GSTRING_LEN, "port.%s",
-- 
2.17.0

[net-next 3/9] i40e: always return all queue stat strings

[Jeff Kirsher]

From: Jacob Keller <jacob.e.keller@intel.com>

The ethtool API for obtaining device statistics is not intended to allow
runtime changes in the number of statistics reported. It may *appear*
this way, as there is an ability to request the number of stats using
ethtool_get_set_count(). However, it is expected that this must always
return the same value for invocations of the same device.

If we don't satisfy this contract, and allow the number of stats to
change during run time, we could cause invalid memory accesses or report
the stat strings incorrectly. This is because the API for obtaining
stats is to (1) get the size, (2) get the strings and finally (3) get
the stats. Since these are each separate ethtool op commands, it is not
possible to maintain consistency by holding the RTNL lock over the whole
operation. This results in the potential for a race condition to occur
where the size changed between any of the 3 calls.

Avoid this issue by requiring that we always return the same value for
a given device. We can check any values which remain constant for the
life of the device, but must not report different sizes depending on
runtime attributes.

This patch specifically fixes the queue statistics to always return
every queue even if it's not currently in use.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 .../net/ethernet/intel/i40e/i40e_ethtool.c    | 22 ++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index de5dad7ff340..bacb01b63727 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -140,8 +140,12 @@ static const struct i40e_stats i40e_gstrings_stats[] = {
 	I40E_PF_STAT("rx_lpi_count", stats.rx_lpi_count),
 };
 
-#define I40E_QUEUE_STATS_LEN(n) \
-	(((struct i40e_netdev_priv *)netdev_priv((n)))->vsi->num_queue_pairs \
+/* We use num_tx_queues here as a proxy for the maximum number of queues
+ * available because we always allocate queues symmetrically.
+ */
+#define I40E_MAX_NUM_QUEUES(n) ((n)->num_tx_queues)
+#define I40E_QUEUE_STATS_LEN(n)                                              \
+	   (I40E_MAX_NUM_QUEUES(n)                                           \
 	    * 2 /* Tx and Rx together */                                     \
 	    * (sizeof(struct i40e_queue_stats) / sizeof(u64)))
 #define I40E_GLOBAL_STATS_LEN	ARRAY_SIZE(i40e_gstrings_stats)
@@ -1712,11 +1716,19 @@ static void i40e_get_ethtool_stats(struct net_device *netdev,
 			    sizeof(u64)) ? *(u64 *)p : *(u32 *)p;
 	}
 	rcu_read_lock();
-	for (j = 0; j < vsi->num_queue_pairs; j++) {
+	for (j = 0; j < I40E_MAX_NUM_QUEUES(netdev) ; j++) {
 		tx_ring = READ_ONCE(vsi->tx_rings[j]);
 
-		if (!tx_ring)
+		if (!tx_ring) {
+			/* Bump the stat counter to skip these stats, and make
+			 * sure the memory is zero'd
+			 */
+			data[i++] = 0;
+			data[i++] = 0;
+			data[i++] = 0;
+			data[i++] = 0;
 			continue;
+		}
 
 		/* process Tx ring statistics */
 		do {
@@ -1800,7 +1812,7 @@ static void i40e_get_strings(struct net_device *netdev, u32 stringset,
 				 i40e_gstrings_misc_stats[i].stat_string);
 			p += ETH_GSTRING_LEN;
 		}
-		for (i = 0; i < vsi->num_queue_pairs; i++) {
+		for (i = 0; i < I40E_MAX_NUM_QUEUES(netdev); i++) {
 			snprintf(p, ETH_GSTRING_LEN, "tx-%d.tx_packets", i);
 			p += ETH_GSTRING_LEN;
 			snprintf(p, ETH_GSTRING_LEN, "tx-%d.tx_bytes", i);
-- 
2.17.0

[net-next 4/9] i40e: split i40e_get_strings() into smaller functions

[Jeff Kirsher]

From: Jacob Keller <jacob.e.keller@intel.com>

Split the statistic strings and private flags strings into their own
separate functions to aid code readability.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 .../net/ethernet/intel/i40e/i40e_ethtool.c    | 183 ++++++++++--------
 1 file changed, 100 insertions(+), 83 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index bacb01b63727..c50ed2d391e1 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -1787,8 +1787,7 @@ static void i40e_get_ethtool_stats(struct net_device *netdev,
 		data[i++] = pf->stats.priority_xon_2_xoff[j];
 }
 
-static void i40e_get_strings(struct net_device *netdev, u32 stringset,
-			     u8 *data)
+static void i40e_get_stat_strings(struct net_device *netdev, u8 *data)
 {
 	struct i40e_netdev_priv *np = netdev_priv(netdev);
 	struct i40e_vsi *vsi = np->vsi;
@@ -1796,95 +1795,113 @@ static void i40e_get_strings(struct net_device *netdev, u32 stringset,
 	char *p = (char *)data;
 	unsigned int i;
 
+	for (i = 0; i < I40E_NETDEV_STATS_LEN; i++) {
+		snprintf(p, ETH_GSTRING_LEN, "%s",
+			 i40e_gstrings_net_stats[i].stat_string);
+		p += ETH_GSTRING_LEN;
+	}
+	for (i = 0; i < I40E_MISC_STATS_LEN; i++) {
+		snprintf(p, ETH_GSTRING_LEN, "%s",
+			 i40e_gstrings_misc_stats[i].stat_string);
+		p += ETH_GSTRING_LEN;
+	}
+	for (i = 0; i < I40E_MAX_NUM_QUEUES(netdev); i++) {
+		snprintf(p, ETH_GSTRING_LEN, "tx-%u.tx_packets", i);
+		p += ETH_GSTRING_LEN;
+		snprintf(p, ETH_GSTRING_LEN, "tx-%u.tx_bytes", i);
+		p += ETH_GSTRING_LEN;
+		snprintf(p, ETH_GSTRING_LEN, "rx-%u.rx_packets", i);
+		p += ETH_GSTRING_LEN;
+		snprintf(p, ETH_GSTRING_LEN, "rx-%u.rx_bytes", i);
+		p += ETH_GSTRING_LEN;
+	}
+	if (vsi != pf->vsi[pf->lan_vsi] || pf->hw.partition_id != 1)
+		return;
+
+	for (i = 0; i < I40E_VEB_STATS_LEN; i++) {
+		snprintf(p, ETH_GSTRING_LEN, "veb.%s",
+			 i40e_gstrings_veb_stats[i].stat_string);
+		p += ETH_GSTRING_LEN;
+	}
+	for (i = 0; i < I40E_MAX_TRAFFIC_CLASS; i++) {
+		snprintf(p, ETH_GSTRING_LEN,
+			 "veb.tc_%u_tx_packets", i);
+		p += ETH_GSTRING_LEN;
+		snprintf(p, ETH_GSTRING_LEN,
+			 "veb.tc_%u_tx_bytes", i);
+		p += ETH_GSTRING_LEN;
+		snprintf(p, ETH_GSTRING_LEN,
+			 "veb.tc_%u_rx_packets", i);
+		p += ETH_GSTRING_LEN;
+		snprintf(p, ETH_GSTRING_LEN,
+			 "veb.tc_%u_rx_bytes", i);
+		p += ETH_GSTRING_LEN;
+	}
+
+	for (i = 0; i < I40E_GLOBAL_STATS_LEN; i++) {
+		snprintf(p, ETH_GSTRING_LEN, "port.%s",
+			 i40e_gstrings_stats[i].stat_string);
+		p += ETH_GSTRING_LEN;
+	}
+	for (i = 0; i < I40E_MAX_USER_PRIORITY; i++) {
+		snprintf(p, ETH_GSTRING_LEN,
+			 "port.tx_priority_%u_xon", i);
+		p += ETH_GSTRING_LEN;
+		snprintf(p, ETH_GSTRING_LEN,
+			 "port.tx_priority_%u_xoff", i);
+		p += ETH_GSTRING_LEN;
+	}
+	for (i = 0; i < I40E_MAX_USER_PRIORITY; i++) {
+		snprintf(p, ETH_GSTRING_LEN,
+			 "port.rx_priority_%u_xon", i);
+		p += ETH_GSTRING_LEN;
+		snprintf(p, ETH_GSTRING_LEN,
+			 "port.rx_priority_%u_xoff", i);
+		p += ETH_GSTRING_LEN;
+	}
+	for (i = 0; i < I40E_MAX_USER_PRIORITY; i++) {
+		snprintf(p, ETH_GSTRING_LEN,
+			 "port.rx_priority_%u_xon_2_xoff", i);
+		p += ETH_GSTRING_LEN;
+	}
+	/* BUG_ON(p - data != I40E_STATS_LEN * ETH_GSTRING_LEN); */
+}
+
+static void i40e_get_priv_flag_strings(struct net_device *netdev, u8 *data)
+{
+	struct i40e_netdev_priv *np = netdev_priv(netdev);
+	struct i40e_vsi *vsi = np->vsi;
+	struct i40e_pf *pf = vsi->back;
+	char *p = (char *)data;
+	unsigned int i;
+
+	for (i = 0; i < I40E_PRIV_FLAGS_STR_LEN; i++) {
+		snprintf(p, ETH_GSTRING_LEN, "%s",
+			 i40e_gstrings_priv_flags[i].flag_string);
+		p += ETH_GSTRING_LEN;
+	}
+	if (pf->hw.pf_id != 0)
+		return;
+	for (i = 0; i < I40E_GL_PRIV_FLAGS_STR_LEN; i++) {
+		snprintf(p, ETH_GSTRING_LEN, "%s",
+			 i40e_gl_gstrings_priv_flags[i].flag_string);
+		p += ETH_GSTRING_LEN;
+	}
+}
+
+static void i40e_get_strings(struct net_device *netdev, u32 stringset,
+			     u8 *data)
+{
 	switch (stringset) {
 	case ETH_SS_TEST:
 		memcpy(data, i40e_gstrings_test,
 		       I40E_TEST_LEN * ETH_GSTRING_LEN);
 		break;
 	case ETH_SS_STATS:
-		for (i = 0; i < I40E_NETDEV_STATS_LEN; i++) {
-			snprintf(p, ETH_GSTRING_LEN, "%s",
-				 i40e_gstrings_net_stats[i].stat_string);
-			p += ETH_GSTRING_LEN;
-		}
-		for (i = 0; i < I40E_MISC_STATS_LEN; i++) {
-			snprintf(p, ETH_GSTRING_LEN, "%s",
-				 i40e_gstrings_misc_stats[i].stat_string);
-			p += ETH_GSTRING_LEN;
-		}
-		for (i = 0; i < I40E_MAX_NUM_QUEUES(netdev); i++) {
-			snprintf(p, ETH_GSTRING_LEN, "tx-%d.tx_packets", i);
-			p += ETH_GSTRING_LEN;
-			snprintf(p, ETH_GSTRING_LEN, "tx-%d.tx_bytes", i);
-			p += ETH_GSTRING_LEN;
-			snprintf(p, ETH_GSTRING_LEN, "rx-%d.rx_packets", i);
-			p += ETH_GSTRING_LEN;
-			snprintf(p, ETH_GSTRING_LEN, "rx-%d.rx_bytes", i);
-			p += ETH_GSTRING_LEN;
-		}
-		if (vsi != pf->vsi[pf->lan_vsi] || pf->hw.partition_id != 1)
-			return;
-
-		for (i = 0; i < I40E_VEB_STATS_LEN; i++) {
-			snprintf(p, ETH_GSTRING_LEN, "veb.%s",
-				 i40e_gstrings_veb_stats[i].stat_string);
-			p += ETH_GSTRING_LEN;
-		}
-		for (i = 0; i < I40E_MAX_TRAFFIC_CLASS; i++) {
-			snprintf(p, ETH_GSTRING_LEN,
-				 "veb.tc_%u_tx_packets", i);
-			p += ETH_GSTRING_LEN;
-			snprintf(p, ETH_GSTRING_LEN,
-				 "veb.tc_%u_tx_bytes", i);
-			p += ETH_GSTRING_LEN;
-			snprintf(p, ETH_GSTRING_LEN,
-				 "veb.tc_%u_rx_packets", i);
-			p += ETH_GSTRING_LEN;
-			snprintf(p, ETH_GSTRING_LEN,
-				 "veb.tc_%u_rx_bytes", i);
-			p += ETH_GSTRING_LEN;
-		}
-		for (i = 0; i < I40E_GLOBAL_STATS_LEN; i++) {
-			snprintf(p, ETH_GSTRING_LEN, "port.%s",
-				 i40e_gstrings_stats[i].stat_string);
-			p += ETH_GSTRING_LEN;
-		}
-		for (i = 0; i < I40E_MAX_USER_PRIORITY; i++) {
-			snprintf(p, ETH_GSTRING_LEN,
-				 "port.tx_priority_%d_xon", i);
-			p += ETH_GSTRING_LEN;
-			snprintf(p, ETH_GSTRING_LEN,
-				 "port.tx_priority_%d_xoff", i);
-			p += ETH_GSTRING_LEN;
-		}
-		for (i = 0; i < I40E_MAX_USER_PRIORITY; i++) {
-			snprintf(p, ETH_GSTRING_LEN,
-				 "port.rx_priority_%d_xon", i);
-			p += ETH_GSTRING_LEN;
-			snprintf(p, ETH_GSTRING_LEN,
-				 "port.rx_priority_%d_xoff", i);
-			p += ETH_GSTRING_LEN;
-		}
-		for (i = 0; i < I40E_MAX_USER_PRIORITY; i++) {
-			snprintf(p, ETH_GSTRING_LEN,
-				 "port.rx_priority_%d_xon_2_xoff", i);
-			p += ETH_GSTRING_LEN;
-		}
-		/* BUG_ON(p - data != I40E_STATS_LEN * ETH_GSTRING_LEN); */
+		i40e_get_stat_strings(netdev, data);
 		break;
 	case ETH_SS_PRIV_FLAGS:
-		for (i = 0; i < I40E_PRIV_FLAGS_STR_LEN; i++) {
-			snprintf(p, ETH_GSTRING_LEN, "%s",
-				 i40e_gstrings_priv_flags[i].flag_string);
-			p += ETH_GSTRING_LEN;
-		}
-		if (pf->hw.pf_id != 0)
-			break;
-		for (i = 0; i < I40E_GL_PRIV_FLAGS_STR_LEN; i++) {
-			snprintf(p, ETH_GSTRING_LEN, "%s",
-				 i40e_gl_gstrings_priv_flags[i].flag_string);
-			p += ETH_GSTRING_LEN;
-		}
+		i40e_get_priv_flag_strings(netdev, data);
 		break;
 	default:
 		break;
-- 
2.17.0

[net-next 5/9] i40e: use WARN_ONCE to replace the commented BUG_ON size check

[Jeff Kirsher]

From: Jacob Keller <jacob.e.keller@intel.com>

We don't really want to use BUG_ON here since that would completely
crash the kernel, thus the reason we commented it out. We *can't* use
BUILD_BUG_ON because at least now (a) the sizes aren't constant (we are
fixing this) and (b) not all compilers are smart enough to understand
that "p - data" is a constant.

Instead, just use a WARN_ONCE so that the first time we end up with an
incorrect size we will dump a stack trace and a message, hopefully
highlighting the issues early in testing.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e_ethtool.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index c50ed2d391e1..32bcb6a2a590 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -1792,8 +1792,8 @@ static void i40e_get_stat_strings(struct net_device *netdev, u8 *data)
 	struct i40e_netdev_priv *np = netdev_priv(netdev);
 	struct i40e_vsi *vsi = np->vsi;
 	struct i40e_pf *pf = vsi->back;
-	char *p = (char *)data;
 	unsigned int i;
+	u8 *p = data;
 
 	for (i = 0; i < I40E_NETDEV_STATS_LEN; i++) {
 		snprintf(p, ETH_GSTRING_LEN, "%s",
@@ -1864,7 +1864,9 @@ static void i40e_get_stat_strings(struct net_device *netdev, u8 *data)
 			 "port.rx_priority_%u_xon_2_xoff", i);
 		p += ETH_GSTRING_LEN;
 	}
-	/* BUG_ON(p - data != I40E_STATS_LEN * ETH_GSTRING_LEN); */
+
+	WARN_ONCE(p - data != i40e_get_stats_count(netdev) * ETH_GSTRING_LEN,
+		  "stat strings count mismatch!");
 }
 
 static void i40e_get_priv_flag_strings(struct net_device *netdev, u8 *data)
-- 
2.17.0

[net-next 6/9] i40e: fold prefix strings directly into stat names

[Jeff Kirsher]

From: Jacob Keller <jacob.e.keller@intel.com>

We always prefix these stats with a fixed string, so just fold this
prefix into the stat string definition. This preparatory work will make
it easier to implement a helper function to copy stats and strings into
the supplied buffers in a future patch.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 .../net/ethernet/intel/i40e/i40e_ethtool.c    | 137 +++++++++---------
 1 file changed, 69 insertions(+), 68 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index 32bcb6a2a590..6b34845d251c 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -42,18 +42,18 @@ static const struct i40e_stats i40e_gstrings_net_stats[] = {
 };
 
 static const struct i40e_stats i40e_gstrings_veb_stats[] = {
-	I40E_VEB_STAT("rx_bytes", stats.rx_bytes),
-	I40E_VEB_STAT("tx_bytes", stats.tx_bytes),
-	I40E_VEB_STAT("rx_unicast", stats.rx_unicast),
-	I40E_VEB_STAT("tx_unicast", stats.tx_unicast),
-	I40E_VEB_STAT("rx_multicast", stats.rx_multicast),
-	I40E_VEB_STAT("tx_multicast", stats.tx_multicast),
-	I40E_VEB_STAT("rx_broadcast", stats.rx_broadcast),
-	I40E_VEB_STAT("tx_broadcast", stats.tx_broadcast),
-	I40E_VEB_STAT("rx_discards", stats.rx_discards),
-	I40E_VEB_STAT("tx_discards", stats.tx_discards),
-	I40E_VEB_STAT("tx_errors", stats.tx_errors),
-	I40E_VEB_STAT("rx_unknown_protocol", stats.rx_unknown_protocol),
+	I40E_VEB_STAT("veb.rx_bytes", stats.rx_bytes),
+	I40E_VEB_STAT("veb.tx_bytes", stats.tx_bytes),
+	I40E_VEB_STAT("veb.rx_unicast", stats.rx_unicast),
+	I40E_VEB_STAT("veb.tx_unicast", stats.tx_unicast),
+	I40E_VEB_STAT("veb.rx_multicast", stats.rx_multicast),
+	I40E_VEB_STAT("veb.tx_multicast", stats.tx_multicast),
+	I40E_VEB_STAT("veb.rx_broadcast", stats.rx_broadcast),
+	I40E_VEB_STAT("veb.tx_broadcast", stats.tx_broadcast),
+	I40E_VEB_STAT("veb.rx_discards", stats.rx_discards),
+	I40E_VEB_STAT("veb.tx_discards", stats.tx_discards),
+	I40E_VEB_STAT("veb.tx_errors", stats.tx_errors),
+	I40E_VEB_STAT("veb.rx_unknown_protocol", stats.rx_unknown_protocol),
 };
 
 static const struct i40e_stats i40e_gstrings_misc_stats[] = {
@@ -82,62 +82,63 @@ static const struct i40e_stats i40e_gstrings_misc_stats[] = {
  * is queried on the base PF netdev, not on the VMDq or FCoE netdev.
  */
 static const struct i40e_stats i40e_gstrings_stats[] = {
-	I40E_PF_STAT("rx_bytes", stats.eth.rx_bytes),
-	I40E_PF_STAT("tx_bytes", stats.eth.tx_bytes),
-	I40E_PF_STAT("rx_unicast", stats.eth.rx_unicast),
-	I40E_PF_STAT("tx_unicast", stats.eth.tx_unicast),
-	I40E_PF_STAT("rx_multicast", stats.eth.rx_multicast),
-	I40E_PF_STAT("tx_multicast", stats.eth.tx_multicast),
-	I40E_PF_STAT("rx_broadcast", stats.eth.rx_broadcast),
-	I40E_PF_STAT("tx_broadcast", stats.eth.tx_broadcast),
-	I40E_PF_STAT("tx_errors", stats.eth.tx_errors),
-	I40E_PF_STAT("rx_dropped", stats.eth.rx_discards),
-	I40E_PF_STAT("tx_dropped_link_down", stats.tx_dropped_link_down),
-	I40E_PF_STAT("rx_crc_errors", stats.crc_errors),
-	I40E_PF_STAT("illegal_bytes", stats.illegal_bytes),
-	I40E_PF_STAT("mac_local_faults", stats.mac_local_faults),
-	I40E_PF_STAT("mac_remote_faults", stats.mac_remote_faults),
-	I40E_PF_STAT("tx_timeout", tx_timeout_count),
-	I40E_PF_STAT("rx_csum_bad", hw_csum_rx_error),
-	I40E_PF_STAT("rx_length_errors", stats.rx_length_errors),
-	I40E_PF_STAT("link_xon_rx", stats.link_xon_rx),
-	I40E_PF_STAT("link_xoff_rx", stats.link_xoff_rx),
-	I40E_PF_STAT("link_xon_tx", stats.link_xon_tx),
-	I40E_PF_STAT("link_xoff_tx", stats.link_xoff_tx),
-	I40E_PF_STAT("rx_size_64", stats.rx_size_64),
-	I40E_PF_STAT("rx_size_127", stats.rx_size_127),
-	I40E_PF_STAT("rx_size_255", stats.rx_size_255),
-	I40E_PF_STAT("rx_size_511", stats.rx_size_511),
-	I40E_PF_STAT("rx_size_1023", stats.rx_size_1023),
-	I40E_PF_STAT("rx_size_1522", stats.rx_size_1522),
-	I40E_PF_STAT("rx_size_big", stats.rx_size_big),
-	I40E_PF_STAT("tx_size_64", stats.tx_size_64),
-	I40E_PF_STAT("tx_size_127", stats.tx_size_127),
-	I40E_PF_STAT("tx_size_255", stats.tx_size_255),
-	I40E_PF_STAT("tx_size_511", stats.tx_size_511),
-	I40E_PF_STAT("tx_size_1023", stats.tx_size_1023),
-	I40E_PF_STAT("tx_size_1522", stats.tx_size_1522),
-	I40E_PF_STAT("tx_size_big", stats.tx_size_big),
-	I40E_PF_STAT("rx_undersize", stats.rx_undersize),
-	I40E_PF_STAT("rx_fragments", stats.rx_fragments),
-	I40E_PF_STAT("rx_oversize", stats.rx_oversize),
-	I40E_PF_STAT("rx_jabber", stats.rx_jabber),
-	I40E_PF_STAT("VF_admin_queue_requests", vf_aq_requests),
-	I40E_PF_STAT("arq_overflows", arq_overflows),
-	I40E_PF_STAT("rx_hwtstamp_cleared", rx_hwtstamp_cleared),
-	I40E_PF_STAT("tx_hwtstamp_skipped", tx_hwtstamp_skipped),
-	I40E_PF_STAT("fdir_flush_cnt", fd_flush_cnt),
-	I40E_PF_STAT("fdir_atr_match", stats.fd_atr_match),
-	I40E_PF_STAT("fdir_atr_tunnel_match", stats.fd_atr_tunnel_match),
-	I40E_PF_STAT("fdir_atr_status", stats.fd_atr_status),
-	I40E_PF_STAT("fdir_sb_match", stats.fd_sb_match),
-	I40E_PF_STAT("fdir_sb_status", stats.fd_sb_status),
+	I40E_PF_STAT("port.rx_bytes", stats.eth.rx_bytes),
+	I40E_PF_STAT("port.tx_bytes", stats.eth.tx_bytes),
+	I40E_PF_STAT("port.rx_unicast", stats.eth.rx_unicast),
+	I40E_PF_STAT("port.tx_unicast", stats.eth.tx_unicast),
+	I40E_PF_STAT("port.rx_multicast", stats.eth.rx_multicast),
+	I40E_PF_STAT("port.tx_multicast", stats.eth.tx_multicast),
+	I40E_PF_STAT("port.rx_broadcast", stats.eth.rx_broadcast),
+	I40E_PF_STAT("port.tx_broadcast", stats.eth.tx_broadcast),
+	I40E_PF_STAT("port.tx_errors", stats.eth.tx_errors),
+	I40E_PF_STAT("port.rx_dropped", stats.eth.rx_discards),
+	I40E_PF_STAT("port.tx_dropped_link_down", stats.tx_dropped_link_down),
+	I40E_PF_STAT("port.rx_crc_errors", stats.crc_errors),
+	I40E_PF_STAT("port.illegal_bytes", stats.illegal_bytes),
+	I40E_PF_STAT("port.mac_local_faults", stats.mac_local_faults),
+	I40E_PF_STAT("port.mac_remote_faults", stats.mac_remote_faults),
+	I40E_PF_STAT("port.tx_timeout", tx_timeout_count),
+	I40E_PF_STAT("port.rx_csum_bad", hw_csum_rx_error),
+	I40E_PF_STAT("port.rx_length_errors", stats.rx_length_errors),
+	I40E_PF_STAT("port.link_xon_rx", stats.link_xon_rx),
+	I40E_PF_STAT("port.link_xoff_rx", stats.link_xoff_rx),
+	I40E_PF_STAT("port.link_xon_tx", stats.link_xon_tx),
+	I40E_PF_STAT("port.link_xoff_tx", stats.link_xoff_tx),
+	I40E_PF_STAT("port.rx_size_64", stats.rx_size_64),
+	I40E_PF_STAT("port.rx_size_127", stats.rx_size_127),
+	I40E_PF_STAT("port.rx_size_255", stats.rx_size_255),
+	I40E_PF_STAT("port.rx_size_511", stats.rx_size_511),
+	I40E_PF_STAT("port.rx_size_1023", stats.rx_size_1023),
+	I40E_PF_STAT("port.rx_size_1522", stats.rx_size_1522),
+	I40E_PF_STAT("port.rx_size_big", stats.rx_size_big),
+	I40E_PF_STAT("port.tx_size_64", stats.tx_size_64),
+	I40E_PF_STAT("port.tx_size_127", stats.tx_size_127),
+	I40E_PF_STAT("port.tx_size_255", stats.tx_size_255),
+	I40E_PF_STAT("port.tx_size_511", stats.tx_size_511),
+	I40E_PF_STAT("port.tx_size_1023", stats.tx_size_1023),
+	I40E_PF_STAT("port.tx_size_1522", stats.tx_size_1522),
+	I40E_PF_STAT("port.tx_size_big", stats.tx_size_big),
+	I40E_PF_STAT("port.rx_undersize", stats.rx_undersize),
+	I40E_PF_STAT("port.rx_fragments", stats.rx_fragments),
+	I40E_PF_STAT("port.rx_oversize", stats.rx_oversize),
+	I40E_PF_STAT("port.rx_jabber", stats.rx_jabber),
+	I40E_PF_STAT("port.VF_admin_queue_requests", vf_aq_requests),
+	I40E_PF_STAT("port.arq_overflows", arq_overflows),
+	I40E_PF_STAT("port.tx_hwtstamp_timeouts", tx_hwtstamp_timeouts),
+	I40E_PF_STAT("port.rx_hwtstamp_cleared", rx_hwtstamp_cleared),
+	I40E_PF_STAT("port.tx_hwtstamp_skipped", tx_hwtstamp_skipped),
+	I40E_PF_STAT("port.fdir_flush_cnt", fd_flush_cnt),
+	I40E_PF_STAT("port.fdir_atr_match", stats.fd_atr_match),
+	I40E_PF_STAT("port.fdir_atr_tunnel_match", stats.fd_atr_tunnel_match),
+	I40E_PF_STAT("port.fdir_atr_status", stats.fd_atr_status),
+	I40E_PF_STAT("port.fdir_sb_match", stats.fd_sb_match),
+	I40E_PF_STAT("port.fdir_sb_status", stats.fd_sb_status),
 
 	/* LPI stats */
-	I40E_PF_STAT("tx_lpi_status", stats.tx_lpi_status),
-	I40E_PF_STAT("rx_lpi_status", stats.rx_lpi_status),
-	I40E_PF_STAT("tx_lpi_count", stats.tx_lpi_count),
-	I40E_PF_STAT("rx_lpi_count", stats.rx_lpi_count),
+	I40E_PF_STAT("port.tx_lpi_status", stats.tx_lpi_status),
+	I40E_PF_STAT("port.rx_lpi_status", stats.rx_lpi_status),
+	I40E_PF_STAT("port.tx_lpi_count", stats.tx_lpi_count),
+	I40E_PF_STAT("port.rx_lpi_count", stats.rx_lpi_count),
 };
 
 /* We use num_tx_queues here as a proxy for the maximum number of queues
@@ -1819,7 +1820,7 @@ static void i40e_get_stat_strings(struct net_device *netdev, u8 *data)
 		return;
 
 	for (i = 0; i < I40E_VEB_STATS_LEN; i++) {
-		snprintf(p, ETH_GSTRING_LEN, "veb.%s",
+		snprintf(p, ETH_GSTRING_LEN, "%s",
 			 i40e_gstrings_veb_stats[i].stat_string);
 		p += ETH_GSTRING_LEN;
 	}
@@ -1839,7 +1840,7 @@ static void i40e_get_stat_strings(struct net_device *netdev, u8 *data)
 	}
 
 	for (i = 0; i < I40E_GLOBAL_STATS_LEN; i++) {
-		snprintf(p, ETH_GSTRING_LEN, "port.%s",
+		snprintf(p, ETH_GSTRING_LEN, "%s",
 			 i40e_gstrings_stats[i].stat_string);
 		p += ETH_GSTRING_LEN;
 	}
-- 
2.17.0

[net-next 7/9] i40e: update data pointer directly when copying to the buffer

[Jeff Kirsher]

From: Jacob Keller <jacob.e.keller@intel.com>

A future patch is going to add a helper function i40e_add_ethtool_stats
that will help lower the amount of boiler plate code in the
i40e_get_ethtool_stats function.

This conversion will take place over many patches, and the helper
function will work by directly updating a reference to the data pointer.

Since this would not work combined with the current method of accessing
data like an array, update all the code that copies stats into the data
buffer to use direct updates to the pointer instead of array accesses.

This will prevent incorrect stat updates for patches in between the
conversion.

Similarly, when copying strings, we used a separate char *p pointer.
Instead, use the data pointer directly as it's already a (u8 *) type
which is the same size.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 .../net/ethernet/intel/i40e/i40e_ethtool.c    | 117 +++++++++---------
 1 file changed, 58 insertions(+), 59 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index 6b34845d251c..44a2803cb1ec 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -1699,7 +1699,6 @@ static void i40e_get_ethtool_stats(struct net_device *netdev,
 	struct i40e_vsi *vsi = np->vsi;
 	struct i40e_pf *pf = vsi->back;
 	unsigned int j;
-	int i = 0;
 	char *p;
 	struct rtnl_link_stats64 *net_stats = i40e_get_vsi_stats_struct(vsi);
 	unsigned int start;
@@ -1708,12 +1707,12 @@ static void i40e_get_ethtool_stats(struct net_device *netdev,
 
 	for (j = 0; j < I40E_NETDEV_STATS_LEN; j++) {
 		p = (char *)net_stats + i40e_gstrings_net_stats[j].stat_offset;
-		data[i++] = (i40e_gstrings_net_stats[j].sizeof_stat ==
+		*(data++) = (i40e_gstrings_net_stats[j].sizeof_stat ==
 			sizeof(u64)) ? *(u64 *)p : *(u32 *)p;
 	}
 	for (j = 0; j < I40E_MISC_STATS_LEN; j++) {
 		p = (char *)vsi + i40e_gstrings_misc_stats[j].stat_offset;
-		data[i++] = (i40e_gstrings_misc_stats[j].sizeof_stat ==
+		*(data++) = (i40e_gstrings_misc_stats[j].sizeof_stat ==
 			    sizeof(u64)) ? *(u64 *)p : *(u32 *)p;
 	}
 	rcu_read_lock();
@@ -1724,29 +1723,29 @@ static void i40e_get_ethtool_stats(struct net_device *netdev,
 			/* Bump the stat counter to skip these stats, and make
 			 * sure the memory is zero'd
 			 */
-			data[i++] = 0;
-			data[i++] = 0;
-			data[i++] = 0;
-			data[i++] = 0;
+			*(data++) = 0;
+			*(data++) = 0;
+			*(data++) = 0;
+			*(data++) = 0;
 			continue;
 		}
 
 		/* process Tx ring statistics */
 		do {
 			start = u64_stats_fetch_begin_irq(&tx_ring->syncp);
-			data[i] = tx_ring->stats.packets;
-			data[i + 1] = tx_ring->stats.bytes;
+			data[0] = tx_ring->stats.packets;
+			data[1] = tx_ring->stats.bytes;
 		} while (u64_stats_fetch_retry_irq(&tx_ring->syncp, start));
-		i += 2;
+		data += 2;
 
 		/* Rx ring is the 2nd half of the queue pair */
 		rx_ring = &tx_ring[1];
 		do {
 			start = u64_stats_fetch_begin_irq(&rx_ring->syncp);
-			data[i] = rx_ring->stats.packets;
-			data[i + 1] = rx_ring->stats.bytes;
+			data[0] = rx_ring->stats.packets;
+			data[1] = rx_ring->stats.bytes;
 		} while (u64_stats_fetch_retry_irq(&rx_ring->syncp, start));
-		i += 2;
+		data += 2;
 	}
 	rcu_read_unlock();
 	if (vsi != pf->vsi[pf->lan_vsi] || pf->hw.partition_id != 1)
@@ -1759,33 +1758,33 @@ static void i40e_get_ethtool_stats(struct net_device *netdev,
 		for (j = 0; j < I40E_VEB_STATS_LEN; j++) {
 			p = (char *)veb;
 			p += i40e_gstrings_veb_stats[j].stat_offset;
-			data[i++] = (i40e_gstrings_veb_stats[j].sizeof_stat ==
+			*(data++) = (i40e_gstrings_veb_stats[j].sizeof_stat ==
 				     sizeof(u64)) ? *(u64 *)p : *(u32 *)p;
 		}
 		for (j = 0; j < I40E_MAX_TRAFFIC_CLASS; j++) {
-			data[i++] = veb->tc_stats.tc_tx_packets[j];
-			data[i++] = veb->tc_stats.tc_tx_bytes[j];
-			data[i++] = veb->tc_stats.tc_rx_packets[j];
-			data[i++] = veb->tc_stats.tc_rx_bytes[j];
+			*(data++) = veb->tc_stats.tc_tx_packets[j];
+			*(data++) = veb->tc_stats.tc_tx_bytes[j];
+			*(data++) = veb->tc_stats.tc_rx_packets[j];
+			*(data++) = veb->tc_stats.tc_rx_bytes[j];
 		}
 	} else {
-		i += I40E_VEB_STATS_TOTAL;
+		data += I40E_VEB_STATS_TOTAL;
 	}
 	for (j = 0; j < I40E_GLOBAL_STATS_LEN; j++) {
 		p = (char *)pf + i40e_gstrings_stats[j].stat_offset;
-		data[i++] = (i40e_gstrings_stats[j].sizeof_stat ==
+		*(data++) = (i40e_gstrings_stats[j].sizeof_stat ==
 			     sizeof(u64)) ? *(u64 *)p : *(u32 *)p;
 	}
 	for (j = 0; j < I40E_MAX_USER_PRIORITY; j++) {
-		data[i++] = pf->stats.priority_xon_tx[j];
-		data[i++] = pf->stats.priority_xoff_tx[j];
+		*(data++) = pf->stats.priority_xon_tx[j];
+		*(data++) = pf->stats.priority_xoff_tx[j];
 	}
 	for (j = 0; j < I40E_MAX_USER_PRIORITY; j++) {
-		data[i++] = pf->stats.priority_xon_rx[j];
-		data[i++] = pf->stats.priority_xoff_rx[j];
+		*(data++) = pf->stats.priority_xon_rx[j];
+		*(data++) = pf->stats.priority_xoff_rx[j];
 	}
 	for (j = 0; j < I40E_MAX_USER_PRIORITY; j++)
-		data[i++] = pf->stats.priority_xon_2_xoff[j];
+		*(data++) = pf->stats.priority_xon_2_xoff[j];
 }
 
 static void i40e_get_stat_strings(struct net_device *netdev, u8 *data)
@@ -1797,73 +1796,73 @@ static void i40e_get_stat_strings(struct net_device *netdev, u8 *data)
 	u8 *p = data;
 
 	for (i = 0; i < I40E_NETDEV_STATS_LEN; i++) {
-		snprintf(p, ETH_GSTRING_LEN, "%s",
+		snprintf(data, ETH_GSTRING_LEN, "%s",
 			 i40e_gstrings_net_stats[i].stat_string);
-		p += ETH_GSTRING_LEN;
+		data += ETH_GSTRING_LEN;
 	}
 	for (i = 0; i < I40E_MISC_STATS_LEN; i++) {
-		snprintf(p, ETH_GSTRING_LEN, "%s",
+		snprintf(data, ETH_GSTRING_LEN, "%s",
 			 i40e_gstrings_misc_stats[i].stat_string);
-		p += ETH_GSTRING_LEN;
+		data += ETH_GSTRING_LEN;
 	}
 	for (i = 0; i < I40E_MAX_NUM_QUEUES(netdev); i++) {
-		snprintf(p, ETH_GSTRING_LEN, "tx-%u.tx_packets", i);
-		p += ETH_GSTRING_LEN;
-		snprintf(p, ETH_GSTRING_LEN, "tx-%u.tx_bytes", i);
-		p += ETH_GSTRING_LEN;
-		snprintf(p, ETH_GSTRING_LEN, "rx-%u.rx_packets", i);
-		p += ETH_GSTRING_LEN;
-		snprintf(p, ETH_GSTRING_LEN, "rx-%u.rx_bytes", i);
-		p += ETH_GSTRING_LEN;
+		snprintf(data, ETH_GSTRING_LEN, "tx-%u.tx_packets", i);
+		data += ETH_GSTRING_LEN;
+		snprintf(data, ETH_GSTRING_LEN, "tx-%u.tx_bytes", i);
+		data += ETH_GSTRING_LEN;
+		snprintf(data, ETH_GSTRING_LEN, "rx-%u.rx_packets", i);
+		data += ETH_GSTRING_LEN;
+		snprintf(data, ETH_GSTRING_LEN, "rx-%u.rx_bytes", i);
+		data += ETH_GSTRING_LEN;
 	}
 	if (vsi != pf->vsi[pf->lan_vsi] || pf->hw.partition_id != 1)
 		return;
 
 	for (i = 0; i < I40E_VEB_STATS_LEN; i++) {
-		snprintf(p, ETH_GSTRING_LEN, "%s",
+		snprintf(data, ETH_GSTRING_LEN, "%s",
 			 i40e_gstrings_veb_stats[i].stat_string);
-		p += ETH_GSTRING_LEN;
+		data += ETH_GSTRING_LEN;
 	}
 	for (i = 0; i < I40E_MAX_TRAFFIC_CLASS; i++) {
-		snprintf(p, ETH_GSTRING_LEN,
+		snprintf(data, ETH_GSTRING_LEN,
 			 "veb.tc_%u_tx_packets", i);
-		p += ETH_GSTRING_LEN;
-		snprintf(p, ETH_GSTRING_LEN,
+		data += ETH_GSTRING_LEN;
+		snprintf(data, ETH_GSTRING_LEN,
 			 "veb.tc_%u_tx_bytes", i);
-		p += ETH_GSTRING_LEN;
-		snprintf(p, ETH_GSTRING_LEN,
+		data += ETH_GSTRING_LEN;
+		snprintf(data, ETH_GSTRING_LEN,
 			 "veb.tc_%u_rx_packets", i);
-		p += ETH_GSTRING_LEN;
-		snprintf(p, ETH_GSTRING_LEN,
+		data += ETH_GSTRING_LEN;
+		snprintf(data, ETH_GSTRING_LEN,
 			 "veb.tc_%u_rx_bytes", i);
-		p += ETH_GSTRING_LEN;
+		data += ETH_GSTRING_LEN;
 	}
 
 	for (i = 0; i < I40E_GLOBAL_STATS_LEN; i++) {
-		snprintf(p, ETH_GSTRING_LEN, "%s",
+		snprintf(data, ETH_GSTRING_LEN, "%s",
 			 i40e_gstrings_stats[i].stat_string);
-		p += ETH_GSTRING_LEN;
+		data += ETH_GSTRING_LEN;
 	}
 	for (i = 0; i < I40E_MAX_USER_PRIORITY; i++) {
-		snprintf(p, ETH_GSTRING_LEN,
+		snprintf(data, ETH_GSTRING_LEN,
 			 "port.tx_priority_%u_xon", i);
-		p += ETH_GSTRING_LEN;
-		snprintf(p, ETH_GSTRING_LEN,
+		data += ETH_GSTRING_LEN;
+		snprintf(data, ETH_GSTRING_LEN,
 			 "port.tx_priority_%u_xoff", i);
-		p += ETH_GSTRING_LEN;
+		data += ETH_GSTRING_LEN;
 	}
 	for (i = 0; i < I40E_MAX_USER_PRIORITY; i++) {
-		snprintf(p, ETH_GSTRING_LEN,
+		snprintf(data, ETH_GSTRING_LEN,
 			 "port.rx_priority_%u_xon", i);
-		p += ETH_GSTRING_LEN;
-		snprintf(p, ETH_GSTRING_LEN,
+		data += ETH_GSTRING_LEN;
+		snprintf(data, ETH_GSTRING_LEN,
 			 "port.rx_priority_%u_xoff", i);
-		p += ETH_GSTRING_LEN;
+		data += ETH_GSTRING_LEN;
 	}
 	for (i = 0; i < I40E_MAX_USER_PRIORITY; i++) {
-		snprintf(p, ETH_GSTRING_LEN,
+		snprintf(data, ETH_GSTRING_LEN,
 			 "port.rx_priority_%u_xon_2_xoff", i);
-		p += ETH_GSTRING_LEN;
+		data += ETH_GSTRING_LEN;
 	}
 
 	WARN_ONCE(p - data != i40e_get_stats_count(netdev) * ETH_GSTRING_LEN,
-- 
2.17.0

[net-next 8/9] i40e: add function doc headers for ethtool stats functions

[Jeff Kirsher]

From: Jacob Keller <jacob.e.keller@intel.com>

Add documentation for the i40e_get_stats_count, i40e_get_stat_strings
and i40e_get_ethtool_stats explaining that the number and ordering of
statistics must remain constant for a given netdevice.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 .../net/ethernet/intel/i40e/i40e_ethtool.c    | 38 +++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index 44a2803cb1ec..4b5ecba0148c 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -1660,6 +1660,20 @@ static int i40e_set_ringparam(struct net_device *netdev,
 	return err;
 }
 
+/**
+ * i40e_get_stats_count - return the stats count for a device
+ * @netdev: the netdev to return the count for
+ *
+ * Returns the total number of statistics for this netdev. Note that even
+ * though this is a function, it is required that the count for a specific
+ * netdev must never change. Basing the count on static values such as the
+ * maximum number of queues or the device type is ok. However, the API for
+ * obtaining stats is *not* safe against changes based on non-static
+ * values such as the *current* number of queues, or runtime flags.
+ *
+ * If a statistic is not always enabled, return it as part of the count
+ * anyways, always return its string, and report its value as zero.
+ **/
 static int i40e_get_stats_count(struct net_device *netdev)
 {
 	struct i40e_netdev_priv *np = netdev_priv(netdev);
@@ -1691,6 +1705,20 @@ static int i40e_get_sset_count(struct net_device *netdev, int sset)
 	}
 }
 
+/**
+ * i40e_get_ethtool_stats - copy stat values into supplied buffer
+ * @netdev: the netdev to collect stats for
+ * @stats: ethtool stats command structure
+ * @data: ethtool supplied buffer
+ *
+ * Copy the stats values for this netdev into the buffer. Expects data to be
+ * pre-allocated to the size returned by i40e_get_stats_count.. Note that all
+ * statistics must be copied in a static order, and the count must not change
+ * for a given netdev. See i40e_get_stats_count for more details.
+ *
+ * If a statistic is not currently valid (such as a disabled queue), this
+ * function reports its value as zero.
+ **/
 static void i40e_get_ethtool_stats(struct net_device *netdev,
 				   struct ethtool_stats *stats, u64 *data)
 {
@@ -1787,6 +1815,16 @@ static void i40e_get_ethtool_stats(struct net_device *netdev,
 		*(data++) = pf->stats.priority_xon_2_xoff[j];
 }
 
+/**
+ * i40e_get_stat_strings - copy stat strings into supplied buffer
+ * @netdev: the netdev to collect strings for
+ * @data: supplied buffer to copy strings into
+ *
+ * Copy the strings related to stats for this netdev. Expects data to be
+ * pre-allocated with the size reported by i40e_get_stats_count. Note that the
+ * strings must be copied in a static order and the total count must not
+ * change for a given netdev. See i40e_get_stats_count for more details.
+ **/
 static void i40e_get_stat_strings(struct net_device *netdev, u8 *data)
 {
 	struct i40e_netdev_priv *np = netdev_priv(netdev);
-- 
2.17.0

[net-next 9/9] i40e: use the more traditional 'i' loop variable

[Jeff Kirsher]

From: Jacob Keller <jacob.e.keller@intel.com>

Since we no longer use i as an array index for the data variable,
replace the use of 'j' with 'i' so that we match the general loop
variable name.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 .../net/ethernet/intel/i40e/i40e_ethtool.c    | 56 +++++++++----------
 1 file changed, 28 insertions(+), 28 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index 4b5ecba0148c..6947a2a571cb 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -1726,26 +1726,26 @@ static void i40e_get_ethtool_stats(struct net_device *netdev,
 	struct i40e_ring *tx_ring, *rx_ring;
 	struct i40e_vsi *vsi = np->vsi;
 	struct i40e_pf *pf = vsi->back;
-	unsigned int j;
+	unsigned int i;
 	char *p;
 	struct rtnl_link_stats64 *net_stats = i40e_get_vsi_stats_struct(vsi);
 	unsigned int start;
 
 	i40e_update_stats(vsi);
 
-	for (j = 0; j < I40E_NETDEV_STATS_LEN; j++) {
-		p = (char *)net_stats + i40e_gstrings_net_stats[j].stat_offset;
-		*(data++) = (i40e_gstrings_net_stats[j].sizeof_stat ==
+	for (i = 0; i < I40E_NETDEV_STATS_LEN; i++) {
+		p = (char *)net_stats + i40e_gstrings_net_stats[i].stat_offset;
+		*(data++) = (i40e_gstrings_net_stats[i].sizeof_stat ==
 			sizeof(u64)) ? *(u64 *)p : *(u32 *)p;
 	}
-	for (j = 0; j < I40E_MISC_STATS_LEN; j++) {
-		p = (char *)vsi + i40e_gstrings_misc_stats[j].stat_offset;
-		*(data++) = (i40e_gstrings_misc_stats[j].sizeof_stat ==
+	for (i = 0; i < I40E_MISC_STATS_LEN; i++) {
+		p = (char *)vsi + i40e_gstrings_misc_stats[i].stat_offset;
+		*(data++) = (i40e_gstrings_misc_stats[i].sizeof_stat ==
 			    sizeof(u64)) ? *(u64 *)p : *(u32 *)p;
 	}
 	rcu_read_lock();
-	for (j = 0; j < I40E_MAX_NUM_QUEUES(netdev) ; j++) {
-		tx_ring = READ_ONCE(vsi->tx_rings[j]);
+	for (i = 0; i < I40E_MAX_NUM_QUEUES(netdev) ; i++) {
+		tx_ring = READ_ONCE(vsi->tx_rings[i]);
 
 		if (!tx_ring) {
 			/* Bump the stat counter to skip these stats, and make
@@ -1783,36 +1783,36 @@ static void i40e_get_ethtool_stats(struct net_device *netdev,
 	    (pf->flags & I40E_FLAG_VEB_STATS_ENABLED)) {
 		struct i40e_veb *veb = pf->veb[pf->lan_veb];
 
-		for (j = 0; j < I40E_VEB_STATS_LEN; j++) {
+		for (i = 0; i < I40E_VEB_STATS_LEN; i++) {
 			p = (char *)veb;
-			p += i40e_gstrings_veb_stats[j].stat_offset;
-			*(data++) = (i40e_gstrings_veb_stats[j].sizeof_stat ==
+			p += i40e_gstrings_veb_stats[i].stat_offset;
+			*(data++) = (i40e_gstrings_veb_stats[i].sizeof_stat ==
 				     sizeof(u64)) ? *(u64 *)p : *(u32 *)p;
 		}
-		for (j = 0; j < I40E_MAX_TRAFFIC_CLASS; j++) {
-			*(data++) = veb->tc_stats.tc_tx_packets[j];
-			*(data++) = veb->tc_stats.tc_tx_bytes[j];
-			*(data++) = veb->tc_stats.tc_rx_packets[j];
-			*(data++) = veb->tc_stats.tc_rx_bytes[j];
+		for (i = 0; i < I40E_MAX_TRAFFIC_CLASS; i++) {
+			*(data++) = veb->tc_stats.tc_tx_packets[i];
+			*(data++) = veb->tc_stats.tc_tx_bytes[i];
+			*(data++) = veb->tc_stats.tc_rx_packets[i];
+			*(data++) = veb->tc_stats.tc_rx_bytes[i];
 		}
 	} else {
 		data += I40E_VEB_STATS_TOTAL;
 	}
-	for (j = 0; j < I40E_GLOBAL_STATS_LEN; j++) {
-		p = (char *)pf + i40e_gstrings_stats[j].stat_offset;
-		*(data++) = (i40e_gstrings_stats[j].sizeof_stat ==
+	for (i = 0; i < I40E_GLOBAL_STATS_LEN; i++) {
+		p = (char *)pf + i40e_gstrings_stats[i].stat_offset;
+		*(data++) = (i40e_gstrings_stats[i].sizeof_stat ==
 			     sizeof(u64)) ? *(u64 *)p : *(u32 *)p;
 	}
-	for (j = 0; j < I40E_MAX_USER_PRIORITY; j++) {
-		*(data++) = pf->stats.priority_xon_tx[j];
-		*(data++) = pf->stats.priority_xoff_tx[j];
+	for (i = 0; i < I40E_MAX_USER_PRIORITY; i++) {
+		*(data++) = pf->stats.priority_xon_tx[i];
+		*(data++) = pf->stats.priority_xoff_tx[i];
 	}
-	for (j = 0; j < I40E_MAX_USER_PRIORITY; j++) {
-		*(data++) = pf->stats.priority_xon_rx[j];
-		*(data++) = pf->stats.priority_xoff_rx[j];
+	for (i = 0; i < I40E_MAX_USER_PRIORITY; i++) {
+		*(data++) = pf->stats.priority_xon_rx[i];
+		*(data++) = pf->stats.priority_xoff_rx[i];
 	}
-	for (j = 0; j < I40E_MAX_USER_PRIORITY; j++)
-		*(data++) = pf->stats.priority_xon_2_xoff[j];
+	for (i = 0; i < I40E_MAX_USER_PRIORITY; i++)
+		*(data++) = pf->stats.priority_xon_2_xoff[i];
 }
 
 /**
-- 
2.17.0

Re: [net-next 0/9][pull request] 40GbE Intel Wired LAN Driver Updates 2018-05-22

[David Miller]

From: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Date: Tue, 22 May 2018 10:45:18 -0700

> This series contains updates to i40e only.
> 
> Jake provides all the changes in this series starting with making it
> consistent in how we approach the bit lock.  Fixed the reporting of the
> VEB statistics and the queue statistics to always return every queue
> even if it is not currently in use.  Use WARN_ONCE() so that the first
> time we end up with an incorrect size we will dump a stack trace and a
> message to help highlight the issue early in testing.  Folded the fixed
> string prefix into the stat string definition.  Instead of using a
> separate char *p pointer when copying strings, use the data pointer
> directly.  Added code comments for several of the statistic functions to
> better explain the number and ordering of statistics.

Pulled, thanks Jeff.