[dpdk-dev] [PATCH v3 6/6] net/sfc: add dynamic log level for MCDI messages

[Andrew Rybchenko <arybchenko@solarflare.com>]

From: Ivan Malov <ivan.malov@oktetlabs.ru>

Signed-off-by: Ivan Malov <ivan.malov@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
Reviewed-by: Andy Moreton <amoreton@solarflare.com>
---
 doc/guides/nics/sfc_efx.rst  | 12 ++++++------
 drivers/net/sfc/sfc.h        |  2 +-
 drivers/net/sfc/sfc_ethdev.c |  3 +--
 drivers/net/sfc/sfc_kvargs.c |  1 -
 drivers/net/sfc/sfc_kvargs.h |  2 --
 drivers/net/sfc/sfc_log.h    | 15 +++++++++++++++
 drivers/net/sfc/sfc_mcdi.c   | 25 +++++++++++++------------
 7 files changed, 36 insertions(+), 24 deletions(-)

diff --git a/doc/guides/nics/sfc_efx.rst b/doc/guides/nics/sfc_efx.rst
index c0b52d3..2e4c3d8 100644
--- a/doc/guides/nics/sfc_efx.rst
+++ b/doc/guides/nics/sfc_efx.rst
@@ -321,12 +321,6 @@ boolean parameters value.
   **auto** allows NIC firmware to make a choice based on
   installed licences and firmware variant configured using **sfboot**.
 
-- ``mcdi_logging`` [bool] (default **n**)
-
-  Enable extra logging of the communication with the NIC's management CPU.
-  The logging is done using RTE_LOG() with INFO level and PMD type.
-  The format is consumed by the Solarflare netlogdecode cross-platform tool.
-
 - ``stats_update_period_ms`` [long] (default **1000**)
 
   Adjust period in milliseconds to update port hardware statistics.
@@ -360,3 +354,9 @@ SFC EFX PMD provides the following log types available for control:
   Matches a subset of per-port log types registered during runtime.
   A full name for a particular type may be obtained by appending a
   dot and a PCI device identifier (``XXXX:XX:XX.X``) to the prefix.
+
+- ``pmd.net.sfc.mcdi`` (default level is **6** - ``RTE_LOG_NOTICE``)
+
+  Extra logging of the communication with the NIC's management CPU.
+  The format of the log is consumed by the Solarflare netlogdecode
+  cross-platform tool. May be managed per-port, as explained above.
diff --git a/drivers/net/sfc/sfc.h b/drivers/net/sfc/sfc.h
index 378c675..65a4df2 100644
--- a/drivers/net/sfc/sfc.h
+++ b/drivers/net/sfc/sfc.h
@@ -104,7 +104,7 @@ struct sfc_mcdi {
 	efsys_mem_t			mem;
 	enum sfc_mcdi_state		state;
 	efx_mcdi_transport_t		transport;
-	bool				logging;
+	uint32_t			logtype;
 	uint32_t			proxy_handle;
 	efx_rc_t			proxy_result;
 };
diff --git a/drivers/net/sfc/sfc_ethdev.c b/drivers/net/sfc/sfc_ethdev.c
index ebd0a23..f16d520 100644
--- a/drivers/net/sfc/sfc_ethdev.c
+++ b/drivers/net/sfc/sfc_ethdev.c
@@ -2065,8 +2065,7 @@ RTE_PMD_REGISTER_PARAM_STRING(net_sfc_efx,
 	SFC_KVARG_RX_DATAPATH "=" SFC_KVARG_VALUES_RX_DATAPATH " "
 	SFC_KVARG_TX_DATAPATH "=" SFC_KVARG_VALUES_TX_DATAPATH " "
 	SFC_KVARG_PERF_PROFILE "=" SFC_KVARG_VALUES_PERF_PROFILE " "
-	SFC_KVARG_STATS_UPDATE_PERIOD_MS "=<long> "
-	SFC_KVARG_MCDI_LOGGING "=" SFC_KVARG_VALUES_BOOL);
+	SFC_KVARG_STATS_UPDATE_PERIOD_MS "=<long>");
 
 RTE_INIT(sfc_driver_register_logtype);
 static void
diff --git a/drivers/net/sfc/sfc_kvargs.c b/drivers/net/sfc/sfc_kvargs.c
index 860adeb..9c08bff 100644
--- a/drivers/net/sfc/sfc_kvargs.c
+++ b/drivers/net/sfc/sfc_kvargs.c
@@ -23,7 +23,6 @@ sfc_kvargs_parse(struct sfc_adapter *sa)
 	struct rte_devargs *devargs = eth_dev->device->devargs;
 	const char **params = (const char *[]){
 		SFC_KVARG_STATS_UPDATE_PERIOD_MS,
-		SFC_KVARG_MCDI_LOGGING,
 		SFC_KVARG_PERF_PROFILE,
 		SFC_KVARG_RX_DATAPATH,
 		SFC_KVARG_TX_DATAPATH,
diff --git a/drivers/net/sfc/sfc_kvargs.h b/drivers/net/sfc/sfc_kvargs.h
index 2c7aaaf..a84dc6b 100644
--- a/drivers/net/sfc/sfc_kvargs.h
+++ b/drivers/net/sfc/sfc_kvargs.h
@@ -18,8 +18,6 @@ extern "C" {
 
 #define SFC_KVARG_VALUES_BOOL		"[1|y|yes|on|0|n|no|off]"
 
-#define SFC_KVARG_MCDI_LOGGING		"mcdi_logging"
-
 #define SFC_KVARG_PERF_PROFILE		"perf_profile"
 
 #define SFC_KVARG_PERF_PROFILE_AUTO		"auto"
diff --git a/drivers/net/sfc/sfc_log.h b/drivers/net/sfc/sfc_log.h
index 6daab1c..d6f3435 100644
--- a/drivers/net/sfc/sfc_log.h
+++ b/drivers/net/sfc/sfc_log.h
@@ -25,6 +25,12 @@ extern uint32_t sfc_logtype_driver;
 /** Name prefix for the per-device log type used to report basic information */
 #define SFC_LOGTYPE_MAIN_STR	SFC_LOGTYPE_PREFIX "main"
 
+/** Device MCDI log type name prefix */
+#define SFC_LOGTYPE_MCDI_STR	SFC_LOGTYPE_PREFIX "mcdi"
+
+/** Level value used by MCDI log statements */
+#define SFC_LOG_LEVEL_MCDI	RTE_LOG_INFO
+
 /* Log PMD message, automatically add prefix and \n */
 #define SFC_LOG(sa, level, type, ...) \
 	do {								\
@@ -84,4 +90,13 @@ extern uint32_t sfc_logtype_driver;
 				RTE_FMT_TAIL(__VA_ARGS__ ,)));		\
 	} while (0)
 
+#define sfc_log_mcdi(sa, ...) \
+	do {								\
+		const struct sfc_adapter *_sa = (sa);			\
+									\
+		SFC_LOG(_sa, SFC_LOG_LEVEL_MCDI, _sa->mcdi.logtype,	\
+			__VA_ARGS__);					\
+	} while (0)
+
+
 #endif /* _SFC_LOG_H_ */
diff --git a/drivers/net/sfc/sfc_mcdi.c b/drivers/net/sfc/sfc_mcdi.c
index 895c2f5..007506b 100644
--- a/drivers/net/sfc/sfc_mcdi.c
+++ b/drivers/net/sfc/sfc_mcdi.c
@@ -15,7 +15,6 @@
 
 #include "sfc.h"
 #include "sfc_log.h"
-#include "sfc_kvargs.h"
 #include "sfc_ev.h"
 
 #define SFC_MCDI_POLL_INTERVAL_MIN_US	10		/* 10us in 1us units */
@@ -176,7 +175,7 @@ sfc_mcdi_do_log(const struct sfc_adapter *sa,
 			 * at the end which is required by netlogdecode.
 			 */
 			buffer[position] = '\0';
-			sfc_notice(sa, "%s \\", buffer);
+			sfc_log_mcdi(sa, "%s \\", buffer);
 			/* Preserve prefix for the next log message */
 			position = pfxsize;
 		}
@@ -198,10 +197,17 @@ sfc_mcdi_logger(void *arg, efx_log_msg_t type,
 	size_t pfxsize;
 	size_t start;
 
-	if (!sa->mcdi.logging)
+	/*
+	 * Unlike the other cases, MCDI logging implies more onerous work
+	 * needed to produce a message. If the dynamic log level prevents
+	 * the end result from being printed, the CPU time will be wasted.
+	 *
+	 * To avoid wasting time, the actual level is examined in advance.
+	 */
+	if (rte_log_get_level(sa->mcdi.logtype) < (int)SFC_LOG_LEVEL_MCDI)
 		return;
 
-	/* The format including prefix added by sfc_notice() is the format
+	/* The format including prefix added by sfc_log_mcdi() is the format
 	 * consumed by the Solarflare netlogdecode tool.
 	 */
 	pfxsize = snprintf(buffer, sizeof(buffer), "MCDI RPC %s:",
@@ -212,7 +218,7 @@ sfc_mcdi_logger(void *arg, efx_log_msg_t type,
 	start = sfc_mcdi_do_log(sa, buffer, data, data_size, pfxsize, start);
 	if (start != pfxsize) {
 		buffer[start] = '\0';
-		sfc_notice(sa, "%s", buffer);
+		sfc_log_mcdi(sa, "%s", buffer);
 	}
 }
 
@@ -250,11 +256,8 @@ sfc_mcdi_init(struct sfc_adapter *sa)
 	if (rc != 0)
 		goto fail_dma_alloc;
 
-	/* Convert negative error to positive used in the driver */
-	rc = sfc_kvargs_process(sa, SFC_KVARG_MCDI_LOGGING,
-				sfc_kvarg_bool_handler, &mcdi->logging);
-	if (rc != 0)
-		goto fail_kvargs_process;
+	mcdi->logtype = sfc_register_logtype(sa, SFC_LOGTYPE_MCDI_STR,
+					     RTE_LOG_NOTICE);
 
 	emtp = &mcdi->transport;
 	emtp->emt_context = sa;
@@ -274,8 +277,6 @@ sfc_mcdi_init(struct sfc_adapter *sa)
 
 fail_mcdi_init:
 	memset(emtp, 0, sizeof(*emtp));
-
-fail_kvargs_process:
 	sfc_dma_free(sa, &mcdi->mem);
 
 fail_dma_alloc:
-- 
2.7.4