sfc: Log all unexpected MCDI errors

Split each of efx_mcdi_rpc, efx_mcdi_rpc_finish, and efx_mcdi_rpc_async into
a normal and a _quiet version; made the former log MCDI errors with
netif_err (and include the raw MCDI error code), and the latter never log
them at all.  Changed various callers; any where some errors are expected
(but others are not) call the _quiet version and then if necessary log the
MCDI error themselves.  Said logging is done by new efx_mcdi_display_error.

Callers of efx_mcdi_rpc*_quiet functions which may want to log the error
need to ensure that their outbuf is big enough to hold an MCDI error; to
this end, they now use MCDI_DECLARE_BUF_OUT_OR_ERR, which always allocates
at least 8 bytes.
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>

drivers/net/ethernet/sfc/ef10.c

@@ -278,11 +278,17 @@ static int efx_ef10_probe(struct efx_nic *efx)
 
 static int efx_ef10_free_vis(struct efx_nic *efx)
 {
-	int rc = efx_mcdi_rpc(efx, MC_CMD_FREE_VIS, NULL, 0, NULL, 0, NULL);
+	MCDI_DECLARE_BUF_OUT_OR_ERR(outbuf, 0);
+	size_t outlen;
+	int rc = efx_mcdi_rpc_quiet(efx, MC_CMD_FREE_VIS, NULL, 0,
+				    outbuf, sizeof(outbuf), &outlen);
 
 	/* -EALREADY means nothing to free, so ignore */
 	if (rc == -EALREADY)
 		rc = 0;
+	if (rc)
+		efx_mcdi_display_error(efx, MC_CMD_FREE_VIS, 0, outbuf, outlen,
+				       rc);
 	return rc;
 }
 
@@ -1244,7 +1250,6 @@ static void efx_ef10_tx_init(struct efx_tx_queue *tx_queue)
 
 fail:
 	WARN_ON(true);
-	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
 }
 
 static void efx_ef10_tx_fini(struct efx_tx_queue *tx_queue)
@@ -1258,7 +1263,7 @@ static void efx_ef10_tx_fini(struct efx_tx_queue *tx_queue)
 	MCDI_SET_DWORD(inbuf, FINI_TXQ_IN_INSTANCE,
 		       tx_queue->queue);
 
-	rc = efx_mcdi_rpc(efx, MC_CMD_FINI_TXQ, inbuf, sizeof(inbuf),
+	rc = efx_mcdi_rpc_quiet(efx, MC_CMD_FINI_TXQ, inbuf, sizeof(inbuf),
 			  outbuf, sizeof(outbuf), &outlen);
 
 	if (rc && rc != -EALREADY)
@@ -1267,7 +1272,8 @@ static void efx_ef10_tx_fini(struct efx_tx_queue *tx_queue)
 	return;
 
 fail:
-	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
+	efx_mcdi_display_error(efx, MC_CMD_FINI_TXQ, MC_CMD_FINI_TXQ_IN_LEN,
+			       outbuf, outlen, rc);
 }
 
 static void efx_ef10_tx_remove(struct efx_tx_queue *tx_queue)
@@ -1482,14 +1488,9 @@ static void efx_ef10_rx_init(struct efx_rx_queue *rx_queue)
 
 	rc = efx_mcdi_rpc(efx, MC_CMD_INIT_RXQ, inbuf, inlen,
 			  outbuf, sizeof(outbuf), &outlen);
-	if (rc)
-		goto fail;
+	WARN_ON(rc);
 
 	return;
-
-fail:
-	WARN_ON(true);
-	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
 }
 
 static void efx_ef10_rx_fini(struct efx_rx_queue *rx_queue)
@@ -1503,7 +1504,7 @@ static void efx_ef10_rx_fini(struct efx_rx_queue *rx_queue)
 	MCDI_SET_DWORD(inbuf, FINI_RXQ_IN_INSTANCE,
 		       efx_rx_queue_index(rx_queue));
 
-	rc = efx_mcdi_rpc(efx, MC_CMD_FINI_RXQ, inbuf, sizeof(inbuf),
+	rc = efx_mcdi_rpc_quiet(efx, MC_CMD_FINI_RXQ, inbuf, sizeof(inbuf),
 			  outbuf, sizeof(outbuf), &outlen);
 
 	if (rc && rc != -EALREADY)
@@ -1512,7 +1513,8 @@ static void efx_ef10_rx_fini(struct efx_rx_queue *rx_queue)
 	return;
 
 fail:
-	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
+	efx_mcdi_display_error(efx, MC_CMD_FINI_RXQ, MC_CMD_FINI_RXQ_IN_LEN,
+			       outbuf, outlen, rc);
 }
 
 static void efx_ef10_rx_remove(struct efx_rx_queue *rx_queue)
@@ -1649,15 +1651,7 @@ static int efx_ef10_ev_init(struct efx_channel *channel)
 
 	rc = efx_mcdi_rpc(efx, MC_CMD_INIT_EVQ, inbuf, inlen,
 			  outbuf, sizeof(outbuf), &outlen);
-	if (rc)
-		goto fail;
-
 	/* IRQ return is ignored */
-
-	return 0;
-
-fail:
-	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
 	return rc;
 }
 
@@ -1671,7 +1665,7 @@ static void efx_ef10_ev_fini(struct efx_channel *channel)
 
 	MCDI_SET_DWORD(inbuf, FINI_EVQ_IN_INSTANCE, channel->channel);
 
-	rc = efx_mcdi_rpc(efx, MC_CMD_FINI_EVQ, inbuf, sizeof(inbuf),
+	rc = efx_mcdi_rpc_quiet(efx, MC_CMD_FINI_EVQ, inbuf, sizeof(inbuf),
 			  outbuf, sizeof(outbuf), &outlen);
 
 	if (rc && rc != -EALREADY)
@@ -1680,7 +1674,8 @@ static void efx_ef10_ev_fini(struct efx_channel *channel)
 	return;
 
 fail:
-	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
+	efx_mcdi_display_error(efx, MC_CMD_FINI_EVQ, MC_CMD_FINI_EVQ_IN_LEN,
+			       outbuf, outlen, rc);
 }
 
 static void efx_ef10_ev_remove(struct efx_channel *channel)

drivers/net/ethernet/sfc/mcdi.h

@@ -116,12 +116,19 @@ void efx_mcdi_fini(struct efx_nic *efx);
 int efx_mcdi_rpc(struct efx_nic *efx, unsigned cmd, const efx_dword_t *inbuf,
 		 size_t inlen, efx_dword_t *outbuf, size_t outlen,
 		 size_t *outlen_actual);
+int efx_mcdi_rpc_quiet(struct efx_nic *efx, unsigned cmd,
+		       const efx_dword_t *inbuf, size_t inlen,
+		       efx_dword_t *outbuf, size_t outlen,
+		       size_t *outlen_actual);
 
 int efx_mcdi_rpc_start(struct efx_nic *efx, unsigned cmd,
 		       const efx_dword_t *inbuf, size_t inlen);
 int efx_mcdi_rpc_finish(struct efx_nic *efx, unsigned cmd, size_t inlen,
 			efx_dword_t *outbuf, size_t outlen,
 			size_t *outlen_actual);
+int efx_mcdi_rpc_finish_quiet(struct efx_nic *efx, unsigned cmd,
+			      size_t inlen, efx_dword_t *outbuf,
+			      size_t outlen, size_t *outlen_actual);
 
 typedef void efx_mcdi_async_completer(struct efx_nic *efx,
 				      unsigned long cookie, int rc,
@@ -131,6 +138,15 @@ int efx_mcdi_rpc_async(struct efx_nic *efx, unsigned int cmd,
 		       const efx_dword_t *inbuf, size_t inlen, size_t outlen,
 		       efx_mcdi_async_completer *complete,
 		       unsigned long cookie);
+int efx_mcdi_rpc_async_quiet(struct efx_nic *efx, unsigned int cmd,
+			     const efx_dword_t *inbuf, size_t inlen,
+			     size_t outlen,
+			     efx_mcdi_async_completer *complete,
+			     unsigned long cookie);
+
+void efx_mcdi_display_error(struct efx_nic *efx, unsigned cmd,
+			    size_t inlen, efx_dword_t *outbuf,
+			    size_t outlen, int rc);
 
 int efx_mcdi_poll_reboot(struct efx_nic *efx);
 void efx_mcdi_mode_poll(struct efx_nic *efx);
@@ -147,6 +163,8 @@ void efx_mcdi_sensor_event(struct efx_nic *efx, efx_qword_t *ev);
  */
 #define MCDI_DECLARE_BUF(_name, _len)					\
 	efx_dword_t _name[DIV_ROUND_UP(_len, 4)]
+#define MCDI_DECLARE_BUF_OUT_OR_ERR(_name, _len)			\
+	MCDI_DECLARE_BUF(_name, max_t(size_t, _len, 8))
 #define _MCDI_PTR(_buf, _offset)					\
 	((u8 *)(_buf) + (_offset))
 #define MCDI_PTR(_buf, _field)						\

drivers/net/ethernet/sfc/mcdi_port.c

@@ -90,13 +90,6 @@ static int efx_mcdi_set_link(struct efx_nic *efx, u32 capabilities,
 
 	rc = efx_mcdi_rpc(efx, MC_CMD_SET_LINK, inbuf, sizeof(inbuf),
 			  NULL, 0, NULL);
-	if (rc)
-		goto fail;
-
-	return 0;
-
-fail:
-	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
 	return rc;
 }
 
@@ -143,17 +136,13 @@ static int efx_mcdi_mdio_read(struct net_device *net_dev,
 	rc = efx_mcdi_rpc(efx, MC_CMD_MDIO_READ, inbuf, sizeof(inbuf),
 			  outbuf, sizeof(outbuf), &outlen);
 	if (rc)
-		goto fail;
+		return rc;
 
 	if (MCDI_DWORD(outbuf, MDIO_READ_OUT_STATUS) !=
 	    MC_CMD_MDIO_STATUS_GOOD)
 		return -EIO;
 
 	return (u16)MCDI_DWORD(outbuf, MDIO_READ_OUT_VALUE);
-
-fail:
-	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
-	return rc;
 }
 
 static int efx_mcdi_mdio_write(struct net_device *net_dev,
@@ -174,17 +163,13 @@ static int efx_mcdi_mdio_write(struct net_device *net_dev,
 	rc = efx_mcdi_rpc(efx, MC_CMD_MDIO_WRITE, inbuf, sizeof(inbuf),
 			  outbuf, sizeof(outbuf), &outlen);
 	if (rc)
-		goto fail;
+		return rc;
 
 	if (MCDI_DWORD(outbuf, MDIO_WRITE_OUT_STATUS) !=
 	    MC_CMD_MDIO_STATUS_GOOD)
 		return -EIO;
 
 	return 0;
-
-fail:
-	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
-	return rc;
 }
 
 static u32 mcdi_to_ethtool_cap(u32 media, u32 cap)
@@ -487,17 +472,14 @@ static bool efx_mcdi_phy_poll(struct efx_nic *efx)
 
 	rc = efx_mcdi_rpc(efx, MC_CMD_GET_LINK, NULL, 0,
 			  outbuf, sizeof(outbuf), NULL);
-	if (rc) {
-		netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n",
-			  __func__, rc);
+	if (rc)
 		efx->link_state.up = false;
-	} else {
+	else
 		efx_mcdi_phy_decode_link(
 			efx, &efx->link_state,
 			MCDI_DWORD(outbuf, GET_LINK_OUT_LINK_SPEED),
 			MCDI_DWORD(outbuf, GET_LINK_OUT_FLAGS),
 			MCDI_DWORD(outbuf, GET_LINK_OUT_FCNTL));
-	}
 
 	return !efx_link_state_equal(&efx->link_state, &old_state);
 }
@@ -531,11 +513,8 @@ static void efx_mcdi_phy_get_settings(struct efx_nic *efx, struct ethtool_cmd *e
 	BUILD_BUG_ON(MC_CMD_GET_LINK_IN_LEN != 0);
 	rc = efx_mcdi_rpc(efx, MC_CMD_GET_LINK, NULL, 0,
 			  outbuf, sizeof(outbuf), NULL);
-	if (rc) {
-		netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n",
-			  __func__, rc);
+	if (rc)
 		return;
-	}
 	ecmd->lp_advertising =
 		mcdi_to_ethtool_cap(phy_cfg->media,
 				    MCDI_DWORD(outbuf, GET_LINK_OUT_LP_CAP));
@@ -918,11 +897,8 @@ bool efx_mcdi_mac_check_fault(struct efx_nic *efx)
 
 	rc = efx_mcdi_rpc(efx, MC_CMD_GET_LINK, NULL, 0,
 			  outbuf, sizeof(outbuf), &outlength);
-	if (rc) {
-		netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n",
-			  __func__, rc);
+	if (rc)
 		return true;
-	}
 
 	return MCDI_DWORD(outbuf, GET_LINK_OUT_MAC_FAULT) != 0;
 }
@@ -960,14 +936,6 @@ static int efx_mcdi_mac_stats(struct efx_nic *efx,
 
 	rc = efx_mcdi_rpc(efx, MC_CMD_MAC_STATS, inbuf, sizeof(inbuf),
 			  NULL, 0, NULL);
-	if (rc)
-		goto fail;
-
-	return 0;
-
-fail:
-	netif_err(efx, hw, efx->net_dev, "%s: action %d failed rc=%d\n",
-		  __func__, action, rc);
 	return rc;
 }
 

drivers/net/ethernet/sfc/ptp.c

@@ -313,6 +313,8 @@ static int efx_phc_enable(struct ptp_clock_info *ptp,
 static int efx_ptp_enable(struct efx_nic *efx)
 {
 	MCDI_DECLARE_BUF(inbuf, MC_CMD_PTP_IN_ENABLE_LEN);
+	MCDI_DECLARE_BUF_OUT_OR_ERR(outbuf, 0);
+	int rc;
 
 	MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_ENABLE);
 	MCDI_SET_DWORD(inbuf, PTP_IN_PERIPH_ID, 0);
@@ -320,8 +322,14 @@ static int efx_ptp_enable(struct efx_nic *efx)
 		       efx->ptp_data->channel->channel);
 	MCDI_SET_DWORD(inbuf, PTP_IN_ENABLE_MODE, efx->ptp_data->mode);
 
-	return efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, sizeof(inbuf),
-			    NULL, 0, NULL);
+	rc = efx_mcdi_rpc_quiet(efx, MC_CMD_PTP, inbuf, sizeof(inbuf),
+				outbuf, sizeof(outbuf), NULL);
+	rc = (rc == -EALREADY) ? 0 : rc;
+	if (rc)
+		efx_mcdi_display_error(efx, MC_CMD_PTP,
+				       MC_CMD_PTP_IN_ENABLE_LEN,
+				       outbuf, sizeof(outbuf), rc);
+	return rc;
 }
 
 /* Disable MCDI PTP support.
@@ -332,11 +340,19 @@ static int efx_ptp_enable(struct efx_nic *efx)
 static int efx_ptp_disable(struct efx_nic *efx)
 {
 	MCDI_DECLARE_BUF(inbuf, MC_CMD_PTP_IN_DISABLE_LEN);
+	MCDI_DECLARE_BUF_OUT_OR_ERR(outbuf, 0);
+	int rc;
 
 	MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_DISABLE);
 	MCDI_SET_DWORD(inbuf, PTP_IN_PERIPH_ID, 0);
-	return efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, sizeof(inbuf),
-			    NULL, 0, NULL);
+	rc = efx_mcdi_rpc_quiet(efx, MC_CMD_PTP, inbuf, sizeof(inbuf),
+				outbuf, sizeof(outbuf), NULL);
+	rc = (rc == -EALREADY) ? 0 : rc;
+	if (rc)
+		efx_mcdi_display_error(efx, MC_CMD_PTP,
+				       MC_CMD_PTP_IN_DISABLE_LEN,
+				       outbuf, sizeof(outbuf), rc);
+	return rc;
 }
 
 static void efx_ptp_deliver_rx_queue(struct sk_buff_head *q)