cxgb4: Added support in debugfs to dump different timer and clock values of the adapter
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_debugfs.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
index df90c78..47c0869 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
@@ -380,6 +380,68 @@
.write = pm_stats_clear
};
+/* Format a value in a unit that differs from the value's native unit by the
+ * given factor.
+ */
+static char *unit_conv(char *buf, size_t len, unsigned int val,
+ unsigned int factor)
+{
+ unsigned int rem = val % factor;
+
+ if (rem == 0) {
+ snprintf(buf, len, "%u", val / factor);
+ } else {
+ while (rem % 10 == 0)
+ rem /= 10;
+ snprintf(buf, len, "%u.%u", val / factor, rem);
+ }
+ return buf;
+}
+
+static int clk_show(struct seq_file *seq, void *v)
+{
+ char buf[32];
+ struct adapter *adap = seq->private;
+ unsigned int cclk_ps = 1000000000 / adap->params.vpd.cclk; /* in ps */
+ u32 res = t4_read_reg(adap, TP_TIMER_RESOLUTION_A);
+ unsigned int tre = TIMERRESOLUTION_G(res);
+ unsigned int dack_re = DELAYEDACKRESOLUTION_G(res);
+ unsigned long long tp_tick_us = (cclk_ps << tre) / 1000000; /* in us */
+
+ seq_printf(seq, "Core clock period: %s ns\n",
+ unit_conv(buf, sizeof(buf), cclk_ps, 1000));
+ seq_printf(seq, "TP timer tick: %s us\n",
+ unit_conv(buf, sizeof(buf), (cclk_ps << tre), 1000000));
+ seq_printf(seq, "TCP timestamp tick: %s us\n",
+ unit_conv(buf, sizeof(buf),
+ (cclk_ps << TIMESTAMPRESOLUTION_G(res)), 1000000));
+ seq_printf(seq, "DACK tick: %s us\n",
+ unit_conv(buf, sizeof(buf), (cclk_ps << dack_re), 1000000));
+ seq_printf(seq, "DACK timer: %u us\n",
+ ((cclk_ps << dack_re) / 1000000) *
+ t4_read_reg(adap, TP_DACK_TIMER_A));
+ seq_printf(seq, "Retransmit min: %llu us\n",
+ tp_tick_us * t4_read_reg(adap, TP_RXT_MIN_A));
+ seq_printf(seq, "Retransmit max: %llu us\n",
+ tp_tick_us * t4_read_reg(adap, TP_RXT_MAX_A));
+ seq_printf(seq, "Persist timer min: %llu us\n",
+ tp_tick_us * t4_read_reg(adap, TP_PERS_MIN_A));
+ seq_printf(seq, "Persist timer max: %llu us\n",
+ tp_tick_us * t4_read_reg(adap, TP_PERS_MAX_A));
+ seq_printf(seq, "Keepalive idle timer: %llu us\n",
+ tp_tick_us * t4_read_reg(adap, TP_KEEP_IDLE_A));
+ seq_printf(seq, "Keepalive interval: %llu us\n",
+ tp_tick_us * t4_read_reg(adap, TP_KEEP_INTVL_A));
+ seq_printf(seq, "Initial SRTT: %llu us\n",
+ tp_tick_us * INITSRTT_G(t4_read_reg(adap, TP_INIT_SRTT_A)));
+ seq_printf(seq, "FINWAIT2 timer: %llu us\n",
+ tp_tick_us * t4_read_reg(adap, TP_FINWAIT2_TIMER_A));
+
+ return 0;
+}
+
+DEFINE_SIMPLE_DEBUGFS_FILE(clk);
+
/* Firmware Device Log dump. */
static const char * const devlog_level_strings[] = {
[FW_DEVLOG_LEVEL_EMERG] = "EMERG",
@@ -1478,6 +1540,7 @@
static struct t4_debugfs_entry t4_debugfs_files[] = {
{ "cim_la", &cim_la_fops, S_IRUSR, 0 },
{ "cim_qcfg", &cim_qcfg_fops, S_IRUSR, 0 },
+ { "clk", &clk_debugfs_fops, S_IRUSR, 0 },
{ "devlog", &devlog_fops, S_IRUSR, 0 },
{ "l2t", &t4_l2t_fops, S_IRUSR, 0},
{ "mps_tcam", &mps_tcam_debugfs_fops, S_IRUSR, 0 },