cxgb4: Add debugfs entry to dump channel rate

Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h b/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
index d84c945..2e70228 100644 (file)
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
@@ -1366,6 +1366,7 @@ void t4_load_mtus(struct adapter *adap, const unsigned short *mtus,
 
 void t4_ulprx_read_la(struct adapter *adap, u32 *la_buf);
 
+void t4_get_chan_txrate(struct adapter *adap, u64 *nic_rate, u64 *ofld_rate);
 void t4_mk_filtdelwr(unsigned int ftid, struct fw_filter_wr *wr, int qid);
 
 void t4_wol_magic_enable(struct adapter *adap, unsigned int port,

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
index eb39564..484eb8c 100644 (file)
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
@@ -752,6 +752,39 @@ static const struct file_operations pm_stats_debugfs_fops = {
        .write   = pm_stats_clear
 };
 
+static int tx_rate_show(struct seq_file *seq, void *v)
+{
+       u64 nrate[NCHAN], orate[NCHAN];
+       struct adapter *adap = seq->private;
+
+       t4_get_chan_txrate(adap, nrate, orate);
+       if (adap->params.arch.nchan == NCHAN) {
+               seq_puts(seq, "              channel 0   channel 1   "
+                        "channel 2   channel 3\n");
+               seq_printf(seq, "NIC B/s:     %10llu  %10llu  %10llu  %10llu\n",
+                          (unsigned long long)nrate[0],
+                          (unsigned long long)nrate[1],
+                          (unsigned long long)nrate[2],
+                          (unsigned long long)nrate[3]);
+               seq_printf(seq, "Offload B/s: %10llu  %10llu  %10llu  %10llu\n",
+                          (unsigned long long)orate[0],
+                          (unsigned long long)orate[1],
+                          (unsigned long long)orate[2],
+                          (unsigned long long)orate[3]);
+       } else {
+               seq_puts(seq, "              channel 0   channel 1\n");
+               seq_printf(seq, "NIC B/s:     %10llu  %10llu\n",
+                          (unsigned long long)nrate[0],
+                          (unsigned long long)nrate[1]);
+               seq_printf(seq, "Offload B/s: %10llu  %10llu\n",
+                          (unsigned long long)orate[0],
+                          (unsigned long long)orate[1]);
+       }
+       return 0;
+}
+
+DEFINE_SIMPLE_DEBUGFS_FILE(tx_rate);
+
 static int cctrl_tbl_show(struct seq_file *seq, void *v)
 {
        static const char * const dec_fac[] = {
@@ -2254,6 +2287,7 @@ int t4_setup_debugfs(struct adapter *adap)
                { "ulprx_la", &ulprx_la_fops, S_IRUSR, 0 },
                { "sensors", &sensors_debugfs_fops, S_IRUSR, 0 },
                { "pm_stats", &pm_stats_debugfs_fops, S_IRUSR, 0 },
+               { "tx_rate", &tx_rate_debugfs_fops, S_IRUSR, 0 },
                { "cctrl", &cctrl_tbl_debugfs_fops, S_IRUSR, 0 },
 #if IS_ENABLED(CONFIG_IPV6)
                { "clip_tbl", &clip_tbl_debugfs_fops, S_IRUSR, 0 },

diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
index c967b24..9d93f4c 100644 (file)
--- a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
@@ -4191,6 +4191,52 @@ void t4_load_mtus(struct adapter *adap, const unsigned short *mtus,
        }
 }
 
+/* Calculates a rate in bytes/s given the number of 256-byte units per 4K core
+ * clocks.  The formula is
+ *
+ * bytes/s = bytes256 * 256 * ClkFreq / 4096
+ *
+ * which is equivalent to
+ *
+ * bytes/s = 62.5 * bytes256 * ClkFreq_ms
+ */
+static u64 chan_rate(struct adapter *adap, unsigned int bytes256)
+{
+       u64 v = bytes256 * adap->params.vpd.cclk;
+
+       return v * 62 + v / 2;
+}
+
+/**
+ *     t4_get_chan_txrate - get the current per channel Tx rates
+ *     @adap: the adapter
+ *     @nic_rate: rates for NIC traffic
+ *     @ofld_rate: rates for offloaded traffic
+ *
+ *     Return the current Tx rates in bytes/s for NIC and offloaded traffic
+ *     for each channel.
+ */
+void t4_get_chan_txrate(struct adapter *adap, u64 *nic_rate, u64 *ofld_rate)
+{
+       u32 v;
+
+       v = t4_read_reg(adap, TP_TX_TRATE_A);
+       nic_rate[0] = chan_rate(adap, TNLRATE0_G(v));
+       nic_rate[1] = chan_rate(adap, TNLRATE1_G(v));
+       if (adap->params.arch.nchan == NCHAN) {
+               nic_rate[2] = chan_rate(adap, TNLRATE2_G(v));
+               nic_rate[3] = chan_rate(adap, TNLRATE3_G(v));
+       }
+
+       v = t4_read_reg(adap, TP_TX_ORATE_A);
+       ofld_rate[0] = chan_rate(adap, OFDRATE0_G(v));
+       ofld_rate[1] = chan_rate(adap, OFDRATE1_G(v));
+       if (adap->params.arch.nchan == NCHAN) {
+               ofld_rate[2] = chan_rate(adap, OFDRATE2_G(v));
+               ofld_rate[3] = chan_rate(adap, OFDRATE3_G(v));
+       }
+}
+
 /**
  *     t4_pmtx_get_stats - returns the HW stats from PMTX
  *     @adap: the adapter

diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h b/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h
index 525d06e..375a825 100644 (file)
--- a/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h
@@ -1361,6 +1361,42 @@
 #define FLMTXFLSTEMPTY_V(x) ((x) << FLMTXFLSTEMPTY_S)
 #define FLMTXFLSTEMPTY_F    FLMTXFLSTEMPTY_V(1U)
 
+#define TP_TX_ORATE_A 0x7ebc
+
+#define OFDRATE3_S    24
+#define OFDRATE3_M    0xffU
+#define OFDRATE3_G(x) (((x) >> OFDRATE3_S) & OFDRATE3_M)
+
+#define OFDRATE2_S    16
+#define OFDRATE2_M    0xffU
+#define OFDRATE2_G(x) (((x) >> OFDRATE2_S) & OFDRATE2_M)
+
+#define OFDRATE1_S    8
+#define OFDRATE1_M    0xffU
+#define OFDRATE1_G(x) (((x) >> OFDRATE1_S) & OFDRATE1_M)
+
+#define OFDRATE0_S    0
+#define OFDRATE0_M    0xffU
+#define OFDRATE0_G(x) (((x) >> OFDRATE0_S) & OFDRATE0_M)
+
+#define TP_TX_TRATE_A 0x7ed0
+
+#define TNLRATE3_S    24
+#define TNLRATE3_M    0xffU
+#define TNLRATE3_G(x) (((x) >> TNLRATE3_S) & TNLRATE3_M)
+
+#define TNLRATE2_S    16
+#define TNLRATE2_M    0xffU
+#define TNLRATE2_G(x) (((x) >> TNLRATE2_S) & TNLRATE2_M)
+
+#define TNLRATE1_S    8
+#define TNLRATE1_M    0xffU
+#define TNLRATE1_G(x) (((x) >> TNLRATE1_S) & TNLRATE1_M)
+
+#define TNLRATE0_S    0
+#define TNLRATE0_M    0xffU
+#define TNLRATE0_G(x) (((x) >> TNLRATE0_S) & TNLRATE0_M)
+
 #define TP_VLAN_PRI_MAP_A 0x140
 
 #define FRAGMENTATION_S    9