[PATCH net-next v2 0/3] net: qualcomm: rmnet: Updates 2018-05-14

[PATCH net-next v2 0/3] net: qualcomm: rmnet: Updates 2018-05-14

[Subash Abhinov Kasiviswanathan]

Patch 1 adds tx_drops counter to more places.
Patch 2 adds ethtool private stats support to make it easy to debug
the checksum offload path.
Patch 3 is a cleanup in command packet processing path.

v1->v2: Fix the incorrect if / else statement in
rmnet_map_checksum_downlink_packet() and define rmnet_ethtool_ops
as static as mentioned by kbuild test robot.

Subash Abhinov Kasiviswanathan (3):
  net: qualcomm: rmnet: Capture all drops in transmit path
  net: qualcomm: rmnet: Add support for ethtool private stats
  net: qualcomm: rmnet: Remove redundant command check

 drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h | 13 +++++
 .../net/ethernet/qualcomm/rmnet/rmnet_handlers.c   | 21 ++++---
 .../ethernet/qualcomm/rmnet/rmnet_map_command.c    | 14 +----
 .../net/ethernet/qualcomm/rmnet/rmnet_map_data.c   | 64 ++++++++++++++++------
 drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c    | 51 +++++++++++++++++
 5 files changed, 125 insertions(+), 38 deletions(-)

-- 
1.9.1

[PATCH net-next v2 1/3] net: qualcomm: rmnet: Capture all drops in transmit path

[Subash Abhinov Kasiviswanathan]

Packets in transmit path could potentially be dropped if there were
errors while adding the MAP header or the checksum header.
Increment the tx_drops stats in these cases.

Additionally, refactor the code to free the packet and increment
the tx_drops stat under a single label.

Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
---
 .../net/ethernet/qualcomm/rmnet/rmnet_handlers.c    | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
index 6fcd586..7fd86d4 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
@@ -148,7 +148,7 @@ static int rmnet_map_egress_handler(struct sk_buff *skb,
 
 	if (skb_headroom(skb) < required_headroom) {
 		if (pskb_expand_head(skb, required_headroom, 0, GFP_KERNEL))
-			goto fail;
+			return -ENOMEM;
 	}
 
 	if (port->data_format & RMNET_FLAGS_EGRESS_MAP_CKSUMV4)
@@ -156,17 +156,13 @@ static int rmnet_map_egress_handler(struct sk_buff *skb,
 
 	map_header = rmnet_map_add_map_header(skb, additional_header_len, 0);
 	if (!map_header)
-		goto fail;
+		return -ENOMEM;
 
 	map_header->mux_id = mux_id;
 
 	skb->protocol = htons(ETH_P_MAP);
 
 	return 0;
-
-fail:
-	kfree_skb(skb);
-	return -ENOMEM;
 }
 
 static void
@@ -228,15 +224,18 @@ void rmnet_egress_handler(struct sk_buff *skb)
 	mux_id = priv->mux_id;
 
 	port = rmnet_get_port(skb->dev);
-	if (!port) {
-		kfree_skb(skb);
-		return;
-	}
+	if (!port)
+		goto drop;
 
 	if (rmnet_map_egress_handler(skb, port, mux_id, orig_dev))
-		return;
+		goto drop;
 
 	rmnet_vnd_tx_fixup(skb, orig_dev);
 
 	dev_queue_xmit(skb);
+	return;
+
+drop:
+	this_cpu_inc(priv->pcpu_stats->stats.tx_drops);
+	kfree_skb(skb);
 }
-- 
1.9.1

[PATCH net-next v2 2/3] net: qualcomm: rmnet: Add support for ethtool private stats

[Subash Abhinov Kasiviswanathan]

Add ethtool private stats handler to debug the handling of packets
with checksum offload header / trailer. This allows to keep track of
the number of packets for which hardware computes the checksum and
counts and reasons where checksum computation was skipped in hardware
and was done in the network stack.

Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
---
 drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h | 13 +++++
 .../net/ethernet/qualcomm/rmnet/rmnet_map_data.c   | 64 ++++++++++++++++------
 drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c    | 51 +++++++++++++++++
 3 files changed, 112 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h
index 0b5b5da..34ac45a 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h
@@ -54,11 +54,24 @@ struct rmnet_pcpu_stats {
 	struct u64_stats_sync syncp;
 };
 
+struct rmnet_priv_stats {
+	u64 csum_ok;
+	u64 csum_valid_unset;
+	u64 csum_validation_failed;
+	u64 csum_err_bad_buffer;
+	u64 csum_err_invalid_ip_version;
+	u64 csum_err_invalid_transport;
+	u64 csum_fragmented_pkt;
+	u64 csum_skipped;
+	u64 csum_sw;
+};
+
 struct rmnet_priv {
 	u8 mux_id;
 	struct net_device *real_dev;
 	struct rmnet_pcpu_stats __percpu *pcpu_stats;
 	struct gro_cells gro_cells;
+	struct rmnet_priv_stats stats;
 };
 
 struct rmnet_port *rmnet_get_port(struct net_device *real_dev);
diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
index a6ea094..57a9c31 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
@@ -48,7 +48,8 @@ static __sum16 *rmnet_map_get_csum_field(unsigned char protocol,
 
 static int
 rmnet_map_ipv4_dl_csum_trailer(struct sk_buff *skb,
-			       struct rmnet_map_dl_csum_trailer *csum_trailer)
+			       struct rmnet_map_dl_csum_trailer *csum_trailer,
+			       struct rmnet_priv *priv)
 {
 	__sum16 *csum_field, csum_temp, pseudo_csum, hdr_csum, ip_payload_csum;
 	u16 csum_value, csum_value_final;
@@ -58,19 +59,25 @@ static __sum16 *rmnet_map_get_csum_field(unsigned char protocol,
 
 	ip4h = (struct iphdr *)(skb->data);
 	if ((ntohs(ip4h->frag_off) & IP_MF) ||
-	    ((ntohs(ip4h->frag_off) & IP_OFFSET) > 0))
+	    ((ntohs(ip4h->frag_off) & IP_OFFSET) > 0)) {
+		priv->stats.csum_fragmented_pkt++;
 		return -EOPNOTSUPP;
+	}
 
 	txporthdr = skb->data + ip4h->ihl * 4;
 
 	csum_field = rmnet_map_get_csum_field(ip4h->protocol, txporthdr);
 
-	if (!csum_field)
+	if (!csum_field) {
+		priv->stats.csum_err_invalid_transport++;
 		return -EPROTONOSUPPORT;
+	}
 
 	/* RFC 768 - Skip IPv4 UDP packets where sender checksum field is 0 */
-	if (*csum_field == 0 && ip4h->protocol == IPPROTO_UDP)
+	if (*csum_field == 0 && ip4h->protocol == IPPROTO_UDP) {
+		priv->stats.csum_skipped++;
 		return 0;
+	}
 
 	csum_value = ~ntohs(csum_trailer->csum_value);
 	hdr_csum = ~ip_fast_csum(ip4h, (int)ip4h->ihl);
@@ -102,16 +109,20 @@ static __sum16 *rmnet_map_get_csum_field(unsigned char protocol,
 		}
 	}
 
-	if (csum_value_final == ntohs((__force __be16)*csum_field))
+	if (csum_value_final == ntohs((__force __be16)*csum_field)) {
+		priv->stats.csum_ok++;
 		return 0;
-	else
+	} else {
+		priv->stats.csum_validation_failed++;
 		return -EINVAL;
+	}
 }
 
 #if IS_ENABLED(CONFIG_IPV6)
 static int
 rmnet_map_ipv6_dl_csum_trailer(struct sk_buff *skb,
-			       struct rmnet_map_dl_csum_trailer *csum_trailer)
+			       struct rmnet_map_dl_csum_trailer *csum_trailer,
+			       struct rmnet_priv *priv)
 {
 	__sum16 *csum_field, ip6_payload_csum, pseudo_csum, csum_temp;
 	u16 csum_value, csum_value_final;
@@ -125,8 +136,10 @@ static __sum16 *rmnet_map_get_csum_field(unsigned char protocol,
 	txporthdr = skb->data + sizeof(struct ipv6hdr);
 	csum_field = rmnet_map_get_csum_field(ip6h->nexthdr, txporthdr);
 
-	if (!csum_field)
+	if (!csum_field) {
+		priv->stats.csum_err_invalid_transport++;
 		return -EPROTONOSUPPORT;
+	}
 
 	csum_value = ~ntohs(csum_trailer->csum_value);
 	ip6_hdr_csum = (__force __be16)
@@ -164,10 +177,13 @@ static __sum16 *rmnet_map_get_csum_field(unsigned char protocol,
 		}
 	}
 
-	if (csum_value_final == ntohs((__force __be16)*csum_field))
+	if (csum_value_final == ntohs((__force __be16)*csum_field)) {
+		priv->stats.csum_ok++;
 		return 0;
-	else
+	} else {
+		priv->stats.csum_validation_failed++;
 		return -EINVAL;
+	}
 }
 #endif
 
@@ -339,24 +355,34 @@ struct sk_buff *rmnet_map_deaggregate(struct sk_buff *skb,
  */
 int rmnet_map_checksum_downlink_packet(struct sk_buff *skb, u16 len)
 {
+	struct rmnet_priv *priv = netdev_priv(skb->dev);
 	struct rmnet_map_dl_csum_trailer *csum_trailer;
 
-	if (unlikely(!(skb->dev->features & NETIF_F_RXCSUM)))
+	if (unlikely(!(skb->dev->features & NETIF_F_RXCSUM))) {
+		priv->stats.csum_sw++;
 		return -EOPNOTSUPP;
+	}
 
 	csum_trailer = (struct rmnet_map_dl_csum_trailer *)(skb->data + len);
 
-	if (!csum_trailer->valid)
+	if (!csum_trailer->valid) {
+		priv->stats.csum_valid_unset++;
 		return -EINVAL;
+	}
 
-	if (skb->protocol == htons(ETH_P_IP))
-		return rmnet_map_ipv4_dl_csum_trailer(skb, csum_trailer);
-	else if (skb->protocol == htons(ETH_P_IPV6))
+	if (skb->protocol == htons(ETH_P_IP)) {
+		return rmnet_map_ipv4_dl_csum_trailer(skb, csum_trailer, priv);
+	} else if (skb->protocol == htons(ETH_P_IPV6)) {
 #if IS_ENABLED(CONFIG_IPV6)
-		return rmnet_map_ipv6_dl_csum_trailer(skb, csum_trailer);
+		return rmnet_map_ipv6_dl_csum_trailer(skb, csum_trailer, priv);
 #else
+		priv->stats.csum_err_invalid_ip_version++;
 		return -EPROTONOSUPPORT;
 #endif
+	} else {
+		priv->stats.csum_err_invalid_ip_version++;
+		return -EPROTONOSUPPORT;
+	}
 
 	return 0;
 }
@@ -367,6 +393,7 @@ int rmnet_map_checksum_downlink_packet(struct sk_buff *skb, u16 len)
 void rmnet_map_checksum_uplink_packet(struct sk_buff *skb,
 				      struct net_device *orig_dev)
 {
+	struct rmnet_priv *priv = netdev_priv(orig_dev);
 	struct rmnet_map_ul_csum_header *ul_header;
 	void *iphdr;
 
@@ -389,8 +416,11 @@ void rmnet_map_checksum_uplink_packet(struct sk_buff *skb,
 			rmnet_map_ipv6_ul_csum_header(iphdr, ul_header, skb);
 			return;
 #else
+			priv->stats.csum_err_invalid_ip_version++;
 			goto sw_csum;
 #endif
+		} else {
+			priv->stats.csum_err_invalid_ip_version++;
 		}
 	}
 
@@ -399,4 +429,6 @@ void rmnet_map_checksum_uplink_packet(struct sk_buff *skb,
 	ul_header->csum_insert_offset = 0;
 	ul_header->csum_enabled = 0;
 	ul_header->udp_ip4_ind = 0;
+
+	priv->stats.csum_sw++;
 }
diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c
index 2ea16a0..cb02e1a 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c
@@ -152,6 +152,56 @@ static void rmnet_get_stats64(struct net_device *dev,
 	.ndo_get_stats64 = rmnet_get_stats64,
 };
 
+static const char rmnet_gstrings_stats[][ETH_GSTRING_LEN] = {
+	"Checksum ok",
+	"Checksum valid bit not set",
+	"Checksum validation failed",
+	"Checksum error bad buffer",
+	"Checksum error bad ip version",
+	"Checksum error bad transport",
+	"Checksum skipped on ip fragment",
+	"Checksum skipped",
+	"Checksum computed in software",
+};
+
+static void rmnet_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
+{
+	switch (stringset) {
+	case ETH_SS_STATS:
+		memcpy(buf, &rmnet_gstrings_stats,
+		       sizeof(rmnet_gstrings_stats));
+		break;
+	}
+}
+
+static int rmnet_get_sset_count(struct net_device *dev, int sset)
+{
+	switch (sset) {
+	case ETH_SS_STATS:
+		return ARRAY_SIZE(rmnet_gstrings_stats);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static void rmnet_get_ethtool_stats(struct net_device *dev,
+				    struct ethtool_stats *stats, u64 *data)
+{
+	struct rmnet_priv *priv = netdev_priv(dev);
+	struct rmnet_priv_stats *st = &priv->stats;
+
+	if (!data)
+		return;
+
+	memcpy(data, st, ARRAY_SIZE(rmnet_gstrings_stats) * sizeof(u64));
+}
+
+static const struct ethtool_ops rmnet_ethtool_ops = {
+	.get_ethtool_stats = rmnet_get_ethtool_stats,
+	.get_strings = rmnet_get_strings,
+	.get_sset_count = rmnet_get_sset_count,
+};
+
 /* Called by kernel whenever a new rmnet<n> device is created. Sets MTU,
  * flags, ARP type, needed headroom, etc...
  */
@@ -170,6 +220,7 @@ void rmnet_vnd_setup(struct net_device *rmnet_dev)
 	rmnet_dev->flags &= ~(IFF_BROADCAST | IFF_MULTICAST);
 
 	rmnet_dev->needs_free_netdev = true;
+	rmnet_dev->ethtool_ops = &rmnet_ethtool_ops;
 }
 
 /* Exposed API */
-- 
1.9.1

[PATCH net-next v2 3/3] net: qualcomm: rmnet: Remove redundant command check

[Subash Abhinov Kasiviswanathan]

The command packet size is already checked once in
rmnet_map_deaggregate() for the header, packet and trailer size, so
this additional check is not needed.

Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
---
 drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c
index 78fdad0..56a93df 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c
@@ -69,17 +69,9 @@ static void rmnet_map_send_ack(struct sk_buff *skb,
 	struct rmnet_map_control_command *cmd;
 	int xmit_status;
 
-	if (port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV4) {
-		if (skb->len < sizeof(struct rmnet_map_header) +
-		    RMNET_MAP_GET_LENGTH(skb) +
-		    sizeof(struct rmnet_map_dl_csum_trailer)) {
-			kfree_skb(skb);
-			return;
-		}
-
-		skb_trim(skb, skb->len -
-			 sizeof(struct rmnet_map_dl_csum_trailer));
-	}
+	if (port->data_format & RMNET_FLAGS_INGRESS_MAP_CKSUMV4)
+		skb_trim(skb,
+			 skb->len - sizeof(struct rmnet_map_dl_csum_trailer));
 
 	skb->protocol = htons(ETH_P_MAP);
 
-- 
1.9.1

Re: [PATCH net-next v2 0/3] net: qualcomm: rmnet: Updates 2018-05-14

[David Miller]

From: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Date: Tue, 15 May 2018 18:51:59 -0600

> Patch 1 adds tx_drops counter to more places.
> Patch 2 adds ethtool private stats support to make it easy to debug
> the checksum offload path.
> Patch 3 is a cleanup in command packet processing path.
> 
> v1->v2: Fix the incorrect if / else statement in
> rmnet_map_checksum_downlink_packet() and define rmnet_ethtool_ops
> as static as mentioned by kbuild test robot.

Series applied, thank you.