netdev - [PATCH net-next] cxgb4: display number of rx and tx pages free

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Date:   Wed, 18 Jul 2018 17:36:12 +0530
From:   Ganesh Goudar <ganeshgr@...lsio.com>
To:     netdev@...r.kernel.org, davem@...emloft.net
Cc:     nirranjan@...lsio.com, indranil@...lsio.com,
        Ganesh Goudar <ganeshgr@...lsio.com>,
        Casey Leedom <leedom@...lsio.com>
Subject: [PATCH net-next] cxgb4: display number of rx and tx pages free

display free rx and tx page count in the meminfo of
an adapter.

Signed-off-by: Casey Leedom <leedom@...lsio.com>
Signed-off-by: Ganesh Goudar <ganeshgr@...lsio.com>
---
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c | 22 +++++++++++++++-------
 drivers/net/ethernet/chelsio/cxgb4/t4_regs.h       | 14 ++++++++++++++
 2 files changed, 29 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
index 511606f..631b78b 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
@@ -2858,6 +2858,7 @@ static int meminfo_show(struct seq_file *seq, void *v)
 {
 	static const char * const memory[] = { "EDC0:", "EDC1:", "MC:",
 					       "MC0:", "MC1:", "HMA:"};
+	unsigned int free_rx_cnt, free_tx_cnt;
 	struct adapter *adap = seq->private;
 	struct cudbg_meminfo meminfo;
 	int i, rc;
@@ -2889,13 +2890,20 @@ static int meminfo_show(struct seq_file *seq, void *v)
 	mem_region_show(seq, "uP Extmem2:", meminfo.up_extmem2_lo,
 			meminfo.up_extmem2_hi);
 
-	seq_printf(seq, "\n%u Rx pages of size %uKiB for %u channels\n",
-		   meminfo.rx_pages_data[0], meminfo.rx_pages_data[1],
-		   meminfo.rx_pages_data[2]);
-
-	seq_printf(seq, "%u Tx pages of size %u%ciB for %u channels\n",
-		   meminfo.tx_pages_data[0], meminfo.tx_pages_data[1],
-		   meminfo.tx_pages_data[2], meminfo.tx_pages_data[3]);
+	for (i = 0, free_rx_cnt = 0; i < 2; i++)
+		free_rx_cnt += FREERXPAGECOUNT_G
+				      (t4_read_reg(adap, TP_FLM_FREE_RX_CNT_A));
+	seq_printf(seq, "\n%u Rx pages (%u free) of size %uKiB for %u channels\n",
+		   meminfo.rx_pages_data[0], free_rx_cnt,
+		   meminfo.rx_pages_data[1], meminfo.rx_pages_data[2]);
+
+	for (i = 0, free_tx_cnt = 0; i < 4; i++)
+		free_tx_cnt += FREETXPAGECOUNT_G
+				      (t4_read_reg(adap, TP_FLM_FREE_TX_CNT_A));
+	seq_printf(seq, "%u Tx pages (%u free) of size %u%ciB for %u channels\n",
+		   meminfo.tx_pages_data[0], free_tx_cnt,
+		   meminfo.tx_pages_data[1], meminfo.tx_pages_data[2],
+		   meminfo.tx_pages_data[3]);
 
 	seq_printf(seq, "%u p-structs\n\n", meminfo.p_structs);
 
diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h b/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h
index 446aaff..da88588 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h
@@ -1502,6 +1502,20 @@
 #define TP_MIB_DATA_A	0x7e54
 #define TP_INT_CAUSE_A	0x7e74
 
+#define TP_FLM_FREE_RX_CNT_A 0x7e84
+
+#define FREERXPAGECOUNT_S    0
+#define FREERXPAGECOUNT_M    0x1fffffU
+#define FREERXPAGECOUNT_V(x) ((x) << FREERXPAGECOUNT_S)
+#define FREERXPAGECOUNT_G(x) (((x) >> FREERXPAGECOUNT_S) & FREERXPAGECOUNT_M)
+
+#define TP_FLM_FREE_TX_CNT_A 0x7e88
+
+#define FREETXPAGECOUNT_S    0
+#define FREETXPAGECOUNT_M    0x1fffffU
+#define FREETXPAGECOUNT_V(x) ((x) << FREETXPAGECOUNT_S)
+#define FREETXPAGECOUNT_G(x) (((x) >> FREETXPAGECOUNT_S) & FREETXPAGECOUNT_M)
+
 #define FLMTXFLSTEMPTY_S    30
 #define FLMTXFLSTEMPTY_V(x) ((x) << FLMTXFLSTEMPTY_S)
 #define FLMTXFLSTEMPTY_F    FLMTXFLSTEMPTY_V(1U)
-- 
2.1.0