Date:   Tue, 28 Aug 2018 18:51:35 -0700
From:   Felix Manlunas <felix.manlunas@...ium.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, raghu.vatsavayi@...ium.com,
        derek.chickles@...ium.com, satananda.burla@...ium.com,
        felix.manlunas@...ium.com, weilin.chang@...ium.com
Subject: [PATCH net-next 2/4] liquidio: make soft command calls synchronous

1. Add wait_for_sc_completion_timeout() for waiting the response and
   handling common response errors
2. Send sc's synchronously: remove unused callback function,
   and context structure; use wait_for_sc_completion_timeout() to wait
   its response.

Signed-off-by: Weilin Chang <weilin.chang@...ium.com>
Signed-off-by: Felix Manlunas <felix.manlunas@...ium.com>
---
 drivers/net/ethernet/cavium/liquidio/lio_core.c    | 134 ++++++---------------
 drivers/net/ethernet/cavium/liquidio/lio_main.c    |  42 ++-----
 drivers/net/ethernet/cavium/liquidio/lio_vf_rep.c  |  42 ++-----
 drivers/net/ethernet/cavium/liquidio/octeon_main.h |  66 ++++++++++
 .../net/ethernet/cavium/liquidio/octeon_network.h  |   6 -
 5 files changed, 129 insertions(+), 161 deletions(-)

diff --git a/drivers/net/ethernet/cavium/liquidio/lio_core.c b/drivers/net/ethernet/cavium/liquidio/lio_core.c
index 8093c5e..822ce0f 100644
--- a/drivers/net/ethernet/cavium/liquidio/lio_core.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_core.c
@@ -1333,8 +1333,6 @@ octnet_nic_stats_callback(struct octeon_device *oct_dev,
 	struct octeon_soft_command *sc = (struct octeon_soft_command *)ptr;
 	struct oct_nic_stats_resp *resp =
 	    (struct oct_nic_stats_resp *)sc->virtrptr;
-	struct oct_nic_stats_ctrl *ctrl =
-	    (struct oct_nic_stats_ctrl *)sc->ctxptr;
 	struct nic_rx_stats *rsp_rstats = &resp->stats.fromwire;
 	struct nic_tx_stats *rsp_tstats = &resp->stats.fromhost;
 	struct nic_rx_stats *rstats = &oct_dev->link_stats.fromwire;
@@ -1424,7 +1422,6 @@ octnet_nic_stats_callback(struct octeon_device *oct_dev,
 	} else {
 		resp->status = -1;
 	}
-	complete(&ctrl->complete);
 }
 
 int octnet_get_link_stats(struct net_device *netdev)
@@ -1432,7 +1429,6 @@ int octnet_get_link_stats(struct net_device *netdev)
 	struct lio *lio = GET_LIO(netdev);
 	struct octeon_device *oct_dev = lio->oct_dev;
 	struct octeon_soft_command *sc;
-	struct oct_nic_stats_ctrl *ctrl;
 	struct oct_nic_stats_resp *resp;
 	int retval;
 
@@ -1441,7 +1437,7 @@ int octnet_get_link_stats(struct net_device *netdev)
 		octeon_alloc_soft_command(oct_dev,
 					  0,
 					  sizeof(struct oct_nic_stats_resp),
-					  sizeof(struct octnic_ctrl_pkt));
+					  0);
 
 	if (!sc)
 		return -ENOMEM;
@@ -1449,66 +1445,39 @@ int octnet_get_link_stats(struct net_device *netdev)
 	resp = (struct oct_nic_stats_resp *)sc->virtrptr;
 	memset(resp, 0, sizeof(struct oct_nic_stats_resp));
 
-	ctrl = (struct oct_nic_stats_ctrl *)sc->ctxptr;
-	memset(ctrl, 0, sizeof(struct oct_nic_stats_ctrl));
-	ctrl->netdev = netdev;
-	init_completion(&ctrl->complete);
+	init_completion(&sc->complete);
+	sc->sc_status = OCTEON_REQUEST_PENDING;
 
 	sc->iq_no = lio->linfo.txpciq[0].s.q_no;
 
 	octeon_prepare_soft_command(oct_dev, sc, OPCODE_NIC,
 				    OPCODE_NIC_PORT_STATS, 0, 0, 0);
 
-	sc->callback = octnet_nic_stats_callback;
-	sc->callback_arg = sc;
-	sc->wait_time = 500;	/*in milli seconds*/
-
 	retval = octeon_send_soft_command(oct_dev, sc);
 	if (retval == IQ_SEND_FAILED) {
 		octeon_free_soft_command(oct_dev, sc);
 		return -EINVAL;
 	}
 
-	wait_for_completion_timeout(&ctrl->complete, msecs_to_jiffies(1000));
-
-	if (resp->status != 1) {
-		octeon_free_soft_command(oct_dev, sc);
-
-		return -EINVAL;
+	retval = wait_for_sc_completion_timeout(oct_dev, sc,
+						(2 * LIO_SC_MAX_TMO_MS));
+	if (retval)  {
+		dev_err(&oct_dev->pci_dev->dev, "sc OPCODE_NIC_PORT_STATS command failed\n");
+		return retval;
 	}
 
-	octeon_free_soft_command(oct_dev, sc);
+	octnet_nic_stats_callback(oct_dev, sc->sc_status, sc);
+	WRITE_ONCE(sc->caller_is_done, true);
 
 	return 0;
 }
 
-static void liquidio_nic_seapi_ctl_callback(struct octeon_device *oct,
-					    u32 status,
-					    void *buf)
-{
-	struct liquidio_nic_seapi_ctl_context *ctx;
-	struct octeon_soft_command *sc = buf;
-
-	ctx = sc->ctxptr;
-
-	oct = lio_get_device(ctx->octeon_id);
-	if (status) {
-		dev_err(&oct->pci_dev->dev, "%s: instruction failed. Status: %llx\n",
-			__func__,
-			CVM_CAST64(status));
-	}
-	ctx->status = status;
-	complete(&ctx->complete);
-}
-
 int liquidio_set_speed(struct lio *lio, int speed)
 {
-	struct liquidio_nic_seapi_ctl_context *ctx;
 	struct octeon_device *oct = lio->oct_dev;
 	struct oct_nic_seapi_resp *resp;
 	struct octeon_soft_command *sc;
 	union octnet_cmd *ncmd;
-	u32 ctx_size;
 	int retval;
 	u32 var;
 
@@ -1521,21 +1490,18 @@ int liquidio_set_speed(struct lio *lio, int speed)
 		return -EOPNOTSUPP;
 	}
 
-	ctx_size = sizeof(struct liquidio_nic_seapi_ctl_context);
 	sc = octeon_alloc_soft_command(oct, OCTNET_CMD_SIZE,
 				       sizeof(struct oct_nic_seapi_resp),
-				       ctx_size);
+				       0);
 	if (!sc)
 		return -ENOMEM;
 
 	ncmd = sc->virtdptr;
-	ctx  = sc->ctxptr;
 	resp = sc->virtrptr;
 	memset(resp, 0, sizeof(struct oct_nic_seapi_resp));
 
-	ctx->octeon_id = lio_get_device_id(oct);
-	ctx->status = 0;
-	init_completion(&ctx->complete);
+	init_completion(&sc->complete);
+	sc->sc_status = OCTEON_REQUEST_PENDING;
 
 	ncmd->u64 = 0;
 	ncmd->s.cmd = SEAPI_CMD_SPEED_SET;
@@ -1548,30 +1514,24 @@ int liquidio_set_speed(struct lio *lio, int speed)
 	octeon_prepare_soft_command(oct, sc, OPCODE_NIC,
 				    OPCODE_NIC_UBOOT_CTL, 0, 0, 0);
 
-	sc->callback = liquidio_nic_seapi_ctl_callback;
-	sc->callback_arg = sc;
-	sc->wait_time = 5000;
-
 	retval = octeon_send_soft_command(oct, sc);
 	if (retval == IQ_SEND_FAILED) {
 		dev_info(&oct->pci_dev->dev, "Failed to send soft command\n");
+		octeon_free_soft_command(oct, sc);
 		retval = -EBUSY;
 	} else {
 		/* Wait for response or timeout */
-		if (wait_for_completion_timeout(&ctx->complete,
-						msecs_to_jiffies(10000)) == 0) {
-			dev_err(&oct->pci_dev->dev, "%s: sc timeout\n",
-				__func__);
-			octeon_free_soft_command(oct, sc);
-			return -EINTR;
-		}
+		retval = wait_for_sc_completion_timeout(oct, sc, 0);
+		if (retval)
+			return retval;
 
 		retval = resp->status;
 
 		if (retval) {
 			dev_err(&oct->pci_dev->dev, "%s failed, retval=%d\n",
 				__func__, retval);
-			octeon_free_soft_command(oct, sc);
+			WRITE_ONCE(sc->caller_is_done, true);
+
 			return -EIO;
 		}
 
@@ -1583,38 +1543,32 @@ int liquidio_set_speed(struct lio *lio, int speed)
 		}
 
 		oct->speed_setting = var;
+		WRITE_ONCE(sc->caller_is_done, true);
 	}
 
-	octeon_free_soft_command(oct, sc);
-
 	return retval;
 }
 
 int liquidio_get_speed(struct lio *lio)
 {
-	struct liquidio_nic_seapi_ctl_context *ctx;
 	struct octeon_device *oct = lio->oct_dev;
 	struct oct_nic_seapi_resp *resp;
 	struct octeon_soft_command *sc;
 	union octnet_cmd *ncmd;
-	u32 ctx_size;
 	int retval;
 
-	ctx_size = sizeof(struct liquidio_nic_seapi_ctl_context);
 	sc = octeon_alloc_soft_command(oct, OCTNET_CMD_SIZE,
 				       sizeof(struct oct_nic_seapi_resp),
-				       ctx_size);
+				       0);
 	if (!sc)
 		return -ENOMEM;
 
 	ncmd = sc->virtdptr;
-	ctx  = sc->ctxptr;
 	resp = sc->virtrptr;
 	memset(resp, 0, sizeof(struct oct_nic_seapi_resp));
 
-	ctx->octeon_id = lio_get_device_id(oct);
-	ctx->status = 0;
-	init_completion(&ctx->complete);
+	init_completion(&sc->complete);
+	sc->sc_status = OCTEON_REQUEST_PENDING;
 
 	ncmd->u64 = 0;
 	ncmd->s.cmd = SEAPI_CMD_SPEED_GET;
@@ -1626,37 +1580,20 @@ int liquidio_get_speed(struct lio *lio)
 	octeon_prepare_soft_command(oct, sc, OPCODE_NIC,
 				    OPCODE_NIC_UBOOT_CTL, 0, 0, 0);
 
-	sc->callback = liquidio_nic_seapi_ctl_callback;
-	sc->callback_arg = sc;
-	sc->wait_time = 5000;
-
 	retval = octeon_send_soft_command(oct, sc);
 	if (retval == IQ_SEND_FAILED) {
 		dev_info(&oct->pci_dev->dev, "Failed to send soft command\n");
-		oct->no_speed_setting = 1;
-		oct->speed_setting = 25;
-
-		retval = -EBUSY;
+		octeon_free_soft_command(oct, sc);
+		retval = -EIO;
 	} else {
-		if (wait_for_completion_timeout(&ctx->complete,
-						msecs_to_jiffies(10000)) == 0) {
-			dev_err(&oct->pci_dev->dev, "%s: sc timeout\n",
-				__func__);
-
-			oct->speed_setting = 25;
-			oct->no_speed_setting = 1;
+		retval = wait_for_sc_completion_timeout(oct, sc, 0);
+		if (retval)
+			return retval;
 
-			octeon_free_soft_command(oct, sc);
-
-			return -EINTR;
-		}
 		retval = resp->status;
 		if (retval) {
 			dev_err(&oct->pci_dev->dev,
 				"%s failed retval=%d\n", __func__, retval);
-			oct->no_speed_setting = 1;
-			oct->speed_setting = 25;
-			octeon_free_soft_command(oct, sc);
 			retval = -EIO;
 		} else {
 			u32 var;
@@ -1664,16 +1601,23 @@ int liquidio_get_speed(struct lio *lio)
 			var = be32_to_cpu((__force __be32)resp->speed);
 			oct->speed_setting = var;
 			if (var == 0xffff) {
-				oct->no_speed_setting = 1;
 				/* unable to access boot variables
 				 * get the default value based on the NIC type
 				 */
-				oct->speed_setting = 25;
+				if (oct->subsystem_id ==
+						OCTEON_CN2350_25GB_SUBSYS_ID ||
+				    oct->subsystem_id ==
+						OCTEON_CN2360_25GB_SUBSYS_ID) {
+					oct->no_speed_setting = 1;
+					oct->speed_setting = 25;
+				} else {
+					oct->speed_setting = 10;
+				}
 			}
+
 		}
+		WRITE_ONCE(sc->caller_is_done, true);
 	}
 
-	octeon_free_soft_command(oct, sc);
-
 	return retval;
 }
diff --git a/drivers/net/ethernet/cavium/liquidio/lio_main.c b/drivers/net/ethernet/cavium/liquidio/lio_main.c
index 6663749..8ddc191 100644
--- a/drivers/net/ethernet/cavium/liquidio/lio_main.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_main.c
@@ -2969,30 +2969,15 @@ static int liquidio_get_vf_config(struct net_device *netdev, int vfidx,
 	return 0;
 }
 
-static void trusted_vf_callback(struct octeon_device *oct_dev,
-				u32 status, void *ptr)
-{
-	struct octeon_soft_command *sc = (struct octeon_soft_command *)ptr;
-	struct lio_trusted_vf_ctx *ctx;
-
-	ctx = (struct lio_trusted_vf_ctx *)sc->ctxptr;
-	ctx->status = status;
-
-	complete(&ctx->complete);
-}
-
 static int liquidio_send_vf_trust_cmd(struct lio *lio, int vfidx, bool trusted)
 {
 	struct octeon_device *oct = lio->oct_dev;
-	struct lio_trusted_vf_ctx *ctx;
 	struct octeon_soft_command *sc;
-	int ctx_size, retval;
-
-	ctx_size = sizeof(struct lio_trusted_vf_ctx);
-	sc = octeon_alloc_soft_command(oct, 0, 0, ctx_size);
+	int retval;
 
-	ctx  = (struct lio_trusted_vf_ctx *)sc->ctxptr;
-	init_completion(&ctx->complete);
+	sc = octeon_alloc_soft_command(oct, 0, 16, 0);
+	if (!sc)
+		return -ENOMEM;
 
 	sc->iq_no = lio->linfo.txpciq[0].s.q_no;
 
@@ -3001,23 +2986,21 @@ static int liquidio_send_vf_trust_cmd(struct lio *lio, int vfidx, bool trusted)
 				    OPCODE_NIC_SET_TRUSTED_VF, 0, vfidx + 1,
 				    trusted);
 
-	sc->callback = trusted_vf_callback;
-	sc->callback_arg = sc;
-	sc->wait_time = 1000;
+	init_completion(&sc->complete);
+	sc->sc_status = OCTEON_REQUEST_PENDING;
 
 	retval = octeon_send_soft_command(oct, sc);
 	if (retval == IQ_SEND_FAILED) {
+		octeon_free_soft_command(oct, sc);
 		retval = -1;
 	} else {
 		/* Wait for response or timeout */
-		if (wait_for_completion_timeout(&ctx->complete,
-						msecs_to_jiffies(2000)))
-			retval = ctx->status;
-		else
-			retval = -1;
-	}
+		retval = wait_for_sc_completion_timeout(oct, sc, 0);
+		if (retval)
+			return (retval);
 
-	octeon_free_soft_command(oct, sc);
+		WRITE_ONCE(sc->caller_is_done, true);
+	}
 
 	return retval;
 }
@@ -3733,7 +3716,6 @@ static int setup_nic_devices(struct octeon_device *octeon_dev)
 			octeon_dev->speed_setting = 10;
 		}
 		octeon_dev->speed_boot = octeon_dev->speed_setting;
-
 	}
 
 	devlink = devlink_alloc(&liquidio_devlink_ops,
diff --git a/drivers/net/ethernet/cavium/liquidio/lio_vf_rep.c b/drivers/net/ethernet/cavium/liquidio/lio_vf_rep.c
index ddd7431..dfd4d10 100644
--- a/drivers/net/ethernet/cavium/liquidio/lio_vf_rep.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_vf_rep.c
@@ -49,44 +49,25 @@ static const struct net_device_ops lio_vf_rep_ndev_ops = {
 	.ndo_change_mtu = lio_vf_rep_change_mtu,
 };
 
-static void
-lio_vf_rep_send_sc_complete(struct octeon_device *oct,
-			    u32 status, void *ptr)
-{
-	struct octeon_soft_command *sc = (struct octeon_soft_command *)ptr;
-	struct lio_vf_rep_sc_ctx *ctx =
-		(struct lio_vf_rep_sc_ctx *)sc->ctxptr;
-	struct lio_vf_rep_resp *resp =
-		(struct lio_vf_rep_resp *)sc->virtrptr;
-
-	if (status != OCTEON_REQUEST_TIMEOUT && READ_ONCE(resp->status))
-		WRITE_ONCE(resp->status, 0);
-
-	complete(&ctx->complete);
-}
-
 static int
 lio_vf_rep_send_soft_command(struct octeon_device *oct,
 			     void *req, int req_size,
 			     void *resp, int resp_size)
 {
 	int tot_resp_size = sizeof(struct lio_vf_rep_resp) + resp_size;
-	int ctx_size = sizeof(struct lio_vf_rep_sc_ctx);
 	struct octeon_soft_command *sc = NULL;
 	struct lio_vf_rep_resp *rep_resp;
-	struct lio_vf_rep_sc_ctx *ctx;
 	void *sc_req;
 	int err;
 
 	sc = (struct octeon_soft_command *)
 		octeon_alloc_soft_command(oct, req_size,
-					  tot_resp_size, ctx_size);
+					  tot_resp_size, 0);
 	if (!sc)
 		return -ENOMEM;
 
-	ctx = (struct lio_vf_rep_sc_ctx *)sc->ctxptr;
-	memset(ctx, 0, ctx_size);
-	init_completion(&ctx->complete);
+	init_completion(&sc->complete);
+	sc->sc_status = OCTEON_REQUEST_PENDING;
 
 	sc_req = (struct lio_vf_rep_req *)sc->virtdptr;
 	memcpy(sc_req, req, req_size);
@@ -98,23 +79,24 @@ lio_vf_rep_send_soft_command(struct octeon_device *oct,
 	sc->iq_no = 0;
 	octeon_prepare_soft_command(oct, sc, OPCODE_NIC,
 				    OPCODE_NIC_VF_REP_CMD, 0, 0, 0);
-	sc->callback = lio_vf_rep_send_sc_complete;
-	sc->callback_arg = sc;
-	sc->wait_time = LIO_VF_REP_REQ_TMO_MS;
 
 	err = octeon_send_soft_command(oct, sc);
 	if (err == IQ_SEND_FAILED)
 		goto free_buff;
 
-	wait_for_completion_timeout(&ctx->complete,
-				    msecs_to_jiffies
-				    (2 * LIO_VF_REP_REQ_TMO_MS));
+	err = wait_for_sc_completion_timeout(oct, sc, 0);
+	if (err)
+		return err;
+
 	err = READ_ONCE(rep_resp->status) ? -EBUSY : 0;
 	if (err)
 		dev_err(&oct->pci_dev->dev, "VF rep send config failed\n");
-
-	if (resp)
+	else if (resp)
 		memcpy(resp, (rep_resp + 1), resp_size);
+
+	WRITE_ONCE(sc->caller_is_done, true);
+	return err;
+
 free_buff:
 	octeon_free_soft_command(oct, sc);
 
diff --git a/drivers/net/ethernet/cavium/liquidio/octeon_main.h b/drivers/net/ethernet/cavium/liquidio/octeon_main.h
index c846eec..de2a229 100644
--- a/drivers/net/ethernet/cavium/liquidio/octeon_main.h
+++ b/drivers/net/ethernet/cavium/liquidio/octeon_main.h
@@ -188,6 +188,72 @@ sleep_timeout_cond(wait_queue_head_t *wait_queue,
 	remove_wait_queue(wait_queue, &we);
 }
 
+/* input parameter:
+ * sc: pointer to a soft request
+ * timeout: milli sec which an application wants to wait for the
+	    response of the request.
+ *          0: the request will wait until its response gets back
+ *	       from the firmware within LIO_SC_MAX_TMO_MS milli sec.
+ *	       It the response does not return within
+ *	       LIO_SC_MAX_TMO_MS milli sec, lio_process_ordered_list()
+ *	       will move the request to zombie response list.
+ *
+ * return value:
+ * 0: got the response from firmware for the sc request.
+ * errno -EINTR: user abort the command.
+ * errno -ETIME: user spefified timeout value has been expired.
+ * errno -EBUSY: the response of the request does not return in
+ *               resonable time (LIO_SC_MAX_TMO_MS).
+ *               the sc wll be move to zombie response list by
+ *               lio_process_ordered_list()
+ *
+ * A request with non-zero return value, the sc->caller_is_done
+ *  will be marked 1.
+ * When getting a request with zero return value, the requestor
+ *  should mark sc->caller_is_done with 1 after examing the
+ *  response of sc.
+ * lio_process_ordered_list() will free the soft command on behalf
+ * of the soft command requestor.
+ * This is to fix the possible race condition of both timeout process
+ * and lio_process_ordered_list()/callback function to free a
+ * sc strucutre.
+ */
+static inline int
+wait_for_sc_completion_timeout(struct octeon_device *oct_dev,
+			       struct octeon_soft_command *sc,
+			       unsigned long timeout)
+{
+	int errno = 0;
+	long timeout_jiff;
+
+	if (timeout)
+		timeout_jiff = msecs_to_jiffies(timeout);
+	else
+		timeout_jiff = MAX_SCHEDULE_TIMEOUT;
+
+	timeout_jiff =
+		wait_for_completion_interruptible_timeout(&sc->complete,
+							  timeout_jiff);
+	if (timeout_jiff == 0) {
+		dev_err(&oct_dev->pci_dev->dev, "%s: sc is timeout\n",
+			__func__);
+		WRITE_ONCE(sc->caller_is_done, true);
+		errno = -ETIME;
+	} else if (timeout_jiff == -ERESTARTSYS) {
+		dev_err(&oct_dev->pci_dev->dev, "%s: sc is interrupted\n",
+			__func__);
+		WRITE_ONCE(sc->caller_is_done, true);
+		errno = -EINTR;
+	} else  if (sc->sc_status == OCTEON_REQUEST_TIMEOUT) {
+		dev_err(&oct_dev->pci_dev->dev, "%s: sc has fatal timeout\n",
+			__func__);
+		WRITE_ONCE(sc->caller_is_done, true);
+		errno = -EBUSY;
+	}
+
+	return errno;
+}
+
 #ifndef ROUNDUP4
 #define ROUNDUP4(val) (((val) + 3) & 0xfffffffc)
 #endif
diff --git a/drivers/net/ethernet/cavium/liquidio/octeon_network.h b/drivers/net/ethernet/cavium/liquidio/octeon_network.h
index d7a3916..a62826a 100644
--- a/drivers/net/ethernet/cavium/liquidio/octeon_network.h
+++ b/drivers/net/ethernet/cavium/liquidio/octeon_network.h
@@ -87,12 +87,6 @@ struct oct_nic_seapi_resp {
 	u64 status;
 };
 
-struct liquidio_nic_seapi_ctl_context {
-	int octeon_id;
-	u32 status;
-	struct completion complete;
-};
-
 /** LiquidIO per-interface network private data */
 struct lio {
 	/** State of the interface. Rx/Tx happens only in the RUNNING state.  */
-- 
2.9.0

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