sfc: add extra RX drop counters for nodesc_trunc and noskb_drop

Added a counter rx_noskb_drop for failure to allocate an skb.
Summed the per-channel rx_nodesc_trunc counters earlier so that they can
 be included in rx_dropped.

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/ef10.c

@@ -755,6 +755,8 @@ static int efx_ef10_reset(struct efx_nic *efx, enum reset_type reset_type)
 	{ NULL, 64, 8 * MC_CMD_MAC_ ## mcdi_name }
 #define EF10_OTHER_STAT(ext_name)				\
 	[EF10_STAT_ ## ext_name] = { #ext_name, 0, 0 }
+#define GENERIC_SW_STAT(ext_name)				\
+	[GENERIC_STAT_ ## ext_name] = { #ext_name, 0, 0 }
 
 static const struct efx_hw_stat_desc efx_ef10_stat_desc[EF10_STAT_COUNT] = {
 	EF10_DMA_STAT(tx_bytes, TX_BYTES),
@@ -798,6 +800,8 @@ static const struct efx_hw_stat_desc efx_ef10_stat_desc[EF10_STAT_COUNT] = {
 	EF10_DMA_STAT(rx_align_error, RX_ALIGN_ERROR_PKTS),
 	EF10_DMA_STAT(rx_length_error, RX_LENGTH_ERROR_PKTS),
 	EF10_DMA_STAT(rx_nodesc_drops, RX_NODESC_DROPS),
+	GENERIC_SW_STAT(rx_nodesc_trunc),
+	GENERIC_SW_STAT(rx_noskb_drops),
 	EF10_DMA_STAT(rx_pm_trunc_bb_overflow, PM_TRUNC_BB_OVERFLOW),
 	EF10_DMA_STAT(rx_pm_discard_bb_overflow, PM_DISCARD_BB_OVERFLOW),
 	EF10_DMA_STAT(rx_pm_trunc_vfifo_full, PM_TRUNC_VFIFO_FULL),
@@ -841,7 +845,9 @@ static const struct efx_hw_stat_desc efx_ef10_stat_desc[EF10_STAT_COUNT] = {
 			       (1ULL << EF10_STAT_rx_gtjumbo) |		\
 			       (1ULL << EF10_STAT_rx_bad_gtjumbo) |	\
 			       (1ULL << EF10_STAT_rx_overflow) |	\
-			       (1ULL << EF10_STAT_rx_nodesc_drops))
+			       (1ULL << EF10_STAT_rx_nodesc_drops) |	\
+			       (1ULL << GENERIC_STAT_rx_nodesc_trunc) |	\
+			       (1ULL << GENERIC_STAT_rx_noskb_drops))
 
 /* These statistics are only provided by the 10G MAC.  For a 10G/40G
  * switchable port we do not expose these because they might not
@@ -951,7 +957,7 @@ static int efx_ef10_try_update_nic_stats(struct efx_nic *efx)
 		stats[EF10_STAT_rx_bytes_minus_good_bytes];
 	efx_update_diff_stat(&stats[EF10_STAT_rx_bad_bytes],
 			     stats[EF10_STAT_rx_bytes_minus_good_bytes]);
-
+	efx_update_sw_stats(efx, stats);
 	return 0;
 }
 
@@ -990,7 +996,9 @@ static size_t efx_ef10_update_stats(struct efx_nic *efx, u64 *full_stats,
 		core_stats->tx_packets = stats[EF10_STAT_tx_packets];
 		core_stats->rx_bytes = stats[EF10_STAT_rx_bytes];
 		core_stats->tx_bytes = stats[EF10_STAT_tx_bytes];
-		core_stats->rx_dropped = stats[EF10_STAT_rx_nodesc_drops];
+		core_stats->rx_dropped = stats[EF10_STAT_rx_nodesc_drops] +
+					 stats[GENERIC_STAT_rx_nodesc_trunc] +
+					 stats[GENERIC_STAT_rx_noskb_drops];
 		core_stats->multicast = stats[EF10_STAT_rx_multicast];
 		core_stats->rx_length_errors =
 			stats[EF10_STAT_rx_gtjumbo] +

drivers/net/ethernet/sfc/efx.c

@@ -2724,6 +2724,17 @@ static void efx_fini_struct(struct efx_nic *efx)
 	}
 }
 
+void efx_update_sw_stats(struct efx_nic *efx, u64 *stats)
+{
+	u64 n_rx_nodesc_trunc = 0;
+	struct efx_channel *channel;
+
+	efx_for_each_channel(channel, efx)
+		n_rx_nodesc_trunc += channel->n_rx_nodesc_trunc;
+	stats[GENERIC_STAT_rx_nodesc_trunc] = n_rx_nodesc_trunc;
+	stats[GENERIC_STAT_rx_noskb_drops] = atomic_read(&efx->n_rx_noskb_drops);
+}
+
 /**************************************************************************
  *
  * PCI interface

drivers/net/ethernet/sfc/efx.h

@@ -199,6 +199,9 @@ void efx_get_irq_moderation(struct efx_nic *efx, unsigned int *tx_usecs,
 int efx_port_dummy_op_int(struct efx_nic *efx);
 void efx_port_dummy_op_void(struct efx_nic *efx);
 
+/* Update the generic software stats in the passed stats array */
+void efx_update_sw_stats(struct efx_nic *efx, u64 *stats);
+
 /* MTD */
 #ifdef CONFIG_SFC_MTD
 int efx_mtd_add(struct efx_nic *efx, struct efx_mtd_partition *parts,

drivers/net/ethernet/sfc/ethtool.c

@@ -77,7 +77,6 @@ static const struct efx_sw_stat_desc efx_sw_stat_desc[] = {
 	EFX_ETHTOOL_UINT_CHANNEL_STAT(rx_tcp_udp_chksum_err),
 	EFX_ETHTOOL_UINT_CHANNEL_STAT(rx_mcast_mismatch),
 	EFX_ETHTOOL_UINT_CHANNEL_STAT(rx_frm_trunc),
-	EFX_ETHTOOL_UINT_CHANNEL_STAT(rx_nodesc_trunc),
 	EFX_ETHTOOL_UINT_CHANNEL_STAT(rx_merge_events),
 	EFX_ETHTOOL_UINT_CHANNEL_STAT(rx_merge_packets),
 };

drivers/net/ethernet/sfc/falcon.c

@@ -142,6 +142,8 @@
 	  hw_name ## _ ## offset }
 #define FALCON_OTHER_STAT(ext_name)					\
 	[FALCON_STAT_ ## ext_name] = { #ext_name, 0, 0 }
+#define GENERIC_SW_STAT(ext_name)				\
+	[GENERIC_STAT_ ## ext_name] = { #ext_name, 0, 0 }
 
 static const struct efx_hw_stat_desc falcon_stat_desc[FALCON_STAT_COUNT] = {
 	FALCON_DMA_STAT(tx_bytes, XgTxOctets),
@@ -191,6 +193,8 @@ static const struct efx_hw_stat_desc falcon_stat_desc[FALCON_STAT_COUNT] = {
 	FALCON_DMA_STAT(rx_length_error, XgRxLengthError),
 	FALCON_DMA_STAT(rx_internal_error, XgRxInternalMACError),
 	FALCON_OTHER_STAT(rx_nodesc_drop_cnt),
+	GENERIC_SW_STAT(rx_nodesc_trunc),
+	GENERIC_SW_STAT(rx_noskb_drops),
 };
 static const unsigned long falcon_stat_mask[] = {
 	[0 ... BITS_TO_LONGS(FALCON_STAT_COUNT) - 1] = ~0UL,
@@ -2574,6 +2578,7 @@ static size_t falcon_update_nic_stats(struct efx_nic *efx, u64 *full_stats,
 				     stats[FALCON_STAT_rx_bytes] -
 				     stats[FALCON_STAT_rx_good_bytes] -
 				     stats[FALCON_STAT_rx_control] * 64);
+		efx_update_sw_stats(efx, stats);
 	}
 
 	if (full_stats)
@@ -2584,7 +2589,9 @@ static size_t falcon_update_nic_stats(struct efx_nic *efx, u64 *full_stats,
 		core_stats->tx_packets = stats[FALCON_STAT_tx_packets];
 		core_stats->rx_bytes = stats[FALCON_STAT_rx_bytes];
 		core_stats->tx_bytes = stats[FALCON_STAT_tx_bytes];
-		core_stats->rx_dropped = stats[FALCON_STAT_rx_nodesc_drop_cnt];
+		core_stats->rx_dropped = stats[FALCON_STAT_rx_nodesc_drop_cnt] +
+					 stats[GENERIC_STAT_rx_nodesc_trunc] +
+					 stats[GENERIC_STAT_rx_noskb_drops];
 		core_stats->multicast = stats[FALCON_STAT_rx_multicast];
 		core_stats->rx_length_errors =
 			stats[FALCON_STAT_rx_gtjumbo] +

drivers/net/ethernet/sfc/net_driver.h

@@ -777,6 +777,7 @@ struct vfdi_status;
  *	interrupt has occurred.
  * @stats_lock: Statistics update lock. Must be held when calling
  *	efx_nic_type::{update,start,stop}_stats.
+ * @n_rx_noskb_drops: Count of RX packets dropped due to failure to allocate an skb
  *
  * This is stored in the private area of the &struct net_device.
  */
@@ -930,6 +931,7 @@ struct efx_nic {
 	spinlock_t biu_lock;
 	int last_irq_cpu;
 	spinlock_t stats_lock;
+	atomic_t n_rx_noskb_drops;
 };
 
 static inline int efx_dev_registered(struct efx_nic *efx)

drivers/net/ethernet/sfc/nic.h

@@ -135,6 +135,13 @@ enum {
 /* Size and alignment of buffer table entries (same) */
 #define EFX_BUF_SIZE	EFX_PAGE_SIZE
 
+/* NIC-generic software stats */
+enum {
+	GENERIC_STAT_rx_noskb_drops,
+	GENERIC_STAT_rx_nodesc_trunc,
+	GENERIC_STAT_COUNT
+};
+
 /**
  * struct falcon_board_type - board operations and type information
  * @id: Board type id, as found in NVRAM
@@ -205,7 +212,7 @@ static inline bool falcon_spi_present(const struct falcon_spi_device *spi)
 }
 
 enum {
-	FALCON_STAT_tx_bytes,
+	FALCON_STAT_tx_bytes = GENERIC_STAT_COUNT,
 	FALCON_STAT_tx_packets,
 	FALCON_STAT_tx_pause,
 	FALCON_STAT_tx_control,
@@ -290,7 +297,7 @@ static inline struct falcon_board *falcon_board(struct efx_nic *efx)
 }
 
 enum {
-	SIENA_STAT_tx_bytes,
+	SIENA_STAT_tx_bytes = GENERIC_STAT_COUNT,
 	SIENA_STAT_tx_good_bytes,
 	SIENA_STAT_tx_bad_bytes,
 	SIENA_STAT_tx_packets,
@@ -361,7 +368,7 @@ struct siena_nic_data {
 };
 
 enum {
-	EF10_STAT_tx_bytes,
+	EF10_STAT_tx_bytes = GENERIC_STAT_COUNT,
 	EF10_STAT_tx_packets,
 	EF10_STAT_tx_pause,
 	EF10_STAT_tx_control,

drivers/net/ethernet/sfc/rx.c

@@ -480,8 +480,10 @@ static struct sk_buff *efx_rx_mk_skb(struct efx_channel *channel,
 	skb = netdev_alloc_skb(efx->net_dev,
 			       efx->rx_ip_align + efx->rx_prefix_size +
 			       hdr_len);
-	if (unlikely(skb == NULL))
+	if (unlikely(skb == NULL)) {
+		atomic_inc(&efx->n_rx_noskb_drops);
 		return NULL;
+	}
 
 	EFX_BUG_ON_PARANOID(rx_buf->len < hdr_len);
 

drivers/net/ethernet/sfc/siena.c

@@ -424,6 +424,8 @@ static void siena_remove_nic(struct efx_nic *efx)
 	{ #ext_name, 64, 8 * MC_CMD_MAC_ ## mcdi_name }
 #define SIENA_OTHER_STAT(ext_name)				\
 	[SIENA_STAT_ ## ext_name] = { #ext_name, 0, 0 }
+#define GENERIC_SW_STAT(ext_name)				\
+	[GENERIC_STAT_ ## ext_name] = { #ext_name, 0, 0 }
 
 static const struct efx_hw_stat_desc siena_stat_desc[SIENA_STAT_COUNT] = {
 	SIENA_DMA_STAT(tx_bytes, TX_BYTES),
@@ -483,6 +485,8 @@ static const struct efx_hw_stat_desc siena_stat_desc[SIENA_STAT_COUNT] = {
 	SIENA_DMA_STAT(rx_length_error, RX_LENGTH_ERROR_PKTS),
 	SIENA_DMA_STAT(rx_internal_error, RX_INTERNAL_ERROR_PKTS),
 	SIENA_DMA_STAT(rx_nodesc_drop_cnt, RX_NODESC_DROPS),
+	GENERIC_SW_STAT(rx_nodesc_trunc),
+	GENERIC_SW_STAT(rx_noskb_drops),
 };
 static const unsigned long siena_stat_mask[] = {
 	[0 ... BITS_TO_LONGS(SIENA_STAT_COUNT) - 1] = ~0UL,
@@ -528,6 +532,7 @@ static int siena_try_update_nic_stats(struct efx_nic *efx)
 	efx_update_diff_stat(&stats[SIENA_STAT_rx_good_bytes],
 			     stats[SIENA_STAT_rx_bytes] -
 			     stats[SIENA_STAT_rx_bad_bytes]);
+	efx_update_sw_stats(efx, stats);
 	return 0;
 }
 
@@ -554,7 +559,9 @@ static size_t siena_update_nic_stats(struct efx_nic *efx, u64 *full_stats,
 		core_stats->tx_packets = stats[SIENA_STAT_tx_packets];
 		core_stats->rx_bytes = stats[SIENA_STAT_rx_bytes];
 		core_stats->tx_bytes = stats[SIENA_STAT_tx_bytes];
-		core_stats->rx_dropped = stats[SIENA_STAT_rx_nodesc_drop_cnt];
+		core_stats->rx_dropped = stats[SIENA_STAT_rx_nodesc_drop_cnt] +
+					 stats[GENERIC_STAT_rx_nodesc_trunc] +
+					 stats[GENERIC_STAT_rx_noskb_drops];
 		core_stats->multicast = stats[SIENA_STAT_rx_multicast];
 		core_stats->collisions = stats[SIENA_STAT_tx_collision];
 		core_stats->rx_length_errors =