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Date:   Tue, 26 May 2020 19:36:34 +0530
From:   Rohit Maheshwari <rohitm@...lsio.com>
To:     netdev@...r.kernel.org, davem@...emloft.net
Cc:     kuba@...nel.org, secdev@...lsio.com,
        Rohit Maheshwari <rohitm@...lsio.com>
Subject: [PATCH net v2] cxgb4/chcr: Enable ktls settings at run time

Current design enables ktls setting from start, which is not
efficient. Now the feature will be enabled when user demands
TLS offload on any interface.

v1->v2:
- taking ULD module refcount till any single connection exists.
- taking rtnl_lock() before clearing tls_devops.

Signed-off-by: Rohit Maheshwari <rohitm@...lsio.com>
---
 drivers/crypto/chelsio/chcr_core.c            |  1 +
 drivers/crypto/chelsio/chcr_ktls.c            | 20 +++++-
 drivers/net/ethernet/chelsio/cxgb4/cxgb4.h    |  4 ++
 .../ethernet/chelsio/cxgb4/cxgb4_debugfs.c    |  2 +
 .../net/ethernet/chelsio/cxgb4/cxgb4_main.c   | 19 ++++-
 .../net/ethernet/chelsio/cxgb4/cxgb4_uld.c    | 72 ++++++++++++++-----
 .../net/ethernet/chelsio/cxgb4/cxgb4_uld.h    |  5 ++
 drivers/net/ethernet/chelsio/cxgb4/t4fw_api.h | 10 ++-
 8 files changed, 110 insertions(+), 23 deletions(-)

diff --git a/drivers/crypto/chelsio/chcr_core.c b/drivers/crypto/chelsio/chcr_core.c
index ffd4ec0c7374..49edc1f46504 100644
--- a/drivers/crypto/chelsio/chcr_core.c
+++ b/drivers/crypto/chelsio/chcr_core.c
@@ -46,6 +46,7 @@ static chcr_handler_func work_handlers[NUM_CPL_CMDS] = {
 };
 
 static struct cxgb4_uld_info chcr_uld_info = {
+	.owner = THIS_MODULE,
 	.name = DRV_MODULE_NAME,
 	.nrxq = MAX_ULD_QSETS,
 	/* Max ntxq will be derived from fw config file*/
diff --git a/drivers/crypto/chelsio/chcr_ktls.c b/drivers/crypto/chelsio/chcr_ktls.c
index 43d9e2420110..1c0f4bbb498e 100644
--- a/drivers/crypto/chelsio/chcr_ktls.c
+++ b/drivers/crypto/chelsio/chcr_ktls.c
@@ -409,6 +409,10 @@ static void chcr_ktls_dev_del(struct net_device *netdev,
 	}
 
 	atomic64_inc(&tx_info->adap->chcr_stats.ktls_tx_connection_close);
+	/* check if ktls settings are no more required. */
+	cxgb4_set_ktls_feature(tx_info->adap,
+			       FW_PARAMS_PARAM_DEV_KTLS_HW_DISABLE);
+
 	kvfree(tx_info);
 	tx_ctx->chcr_info = NULL;
 }
@@ -529,6 +533,9 @@ static int chcr_ktls_dev_add(struct net_device *netdev, struct sock *sk,
 		goto out2;
 
 	atomic64_inc(&adap->chcr_stats.ktls_tx_connection_open);
+
+	cxgb4_set_ktls_feature(tx_info->adap,
+			       FW_PARAMS_PARAM_DEV_KTLS_HW_ENABLE);
 	return 0;
 out2:
 	kvfree(tx_info);
@@ -550,11 +557,17 @@ void chcr_enable_ktls(struct adapter *adap)
 	struct net_device *netdev;
 	int i;
 
+	/* clear refcount */
+	refcount_set(&adap->chcr_ktls.ktls_refcount, 0);
+
 	for_each_port(adap, i) {
 		netdev = adap->port[i];
-		netdev->features |= NETIF_F_HW_TLS_TX;
+		rtnl_lock();
 		netdev->hw_features |= NETIF_F_HW_TLS_TX;
 		netdev->tlsdev_ops = &chcr_ktls_ops;
+
+		netdev_update_features(netdev);
+		rtnl_unlock();
 	}
 }
 
@@ -568,9 +581,12 @@ void chcr_disable_ktls(struct adapter *adap)
 
 	for_each_port(adap, i) {
 		netdev = adap->port[i];
-		netdev->features &= ~NETIF_F_HW_TLS_TX;
+
+		rtnl_lock();
 		netdev->hw_features &= ~NETIF_F_HW_TLS_TX;
 		netdev->tlsdev_ops = NULL;
+		netdev_update_features(netdev);
+		rtnl_unlock();
 	}
 }
 
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h b/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
index 5a41801acb6a..cf69c6edcfec 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
@@ -1099,6 +1099,7 @@ struct adapter {
 
 	/* TC u32 offload */
 	struct cxgb4_tc_u32_table *tc_u32;
+	struct chcr_ktls chcr_ktls;
 	struct chcr_stats_debug chcr_stats;
 
 	/* TC flower offload */
@@ -2060,4 +2061,7 @@ int cxgb_open(struct net_device *dev);
 int cxgb_close(struct net_device *dev);
 void cxgb4_enable_rx(struct adapter *adap, struct sge_rspq *q);
 void cxgb4_quiesce_rx(struct sge_rspq *q);
+#ifdef CONFIG_CHELSIO_TLS_DEVICE
+int cxgb4_set_ktls_feature(struct adapter *adap, bool enable);
+#endif
 #endif /* __CXGB4_H__ */
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
index c3dd50b45c48..41315712deb8 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
@@ -3491,6 +3491,8 @@ static int chcr_stats_show(struct seq_file *seq, void *v)
 		   atomic_read(&adap->chcr_stats.tls_key));
 #ifdef CONFIG_CHELSIO_TLS_DEVICE
 	seq_puts(seq, "\nChelsio KTLS Crypto Accelerator Stats\n");
+	seq_printf(seq, "Tx TLS offload refcount:          %20u\n",
+		   refcount_read(&adap->chcr_ktls.ktls_refcount));
 	seq_printf(seq, "Tx HW offload contexts added:     %20llu\n",
 		   atomic64_read(&adap->chcr_stats.ktls_tx_ctx));
 	seq_printf(seq, "Tx connection created:            %20llu\n",
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
index 7a0414f379be..b80891e8d352 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
@@ -1256,10 +1256,27 @@ int cxgb4_set_rspq_intr_params(struct sge_rspq *q,
 
 static int cxgb_set_features(struct net_device *dev, netdev_features_t features)
 {
-	const struct port_info *pi = netdev_priv(dev);
 	netdev_features_t changed = dev->features ^ features;
+	const struct port_info *pi = netdev_priv(dev);
+#ifdef CONFIG_CHELSIO_TLS_DEVICE
+	bool enable;
+#endif
 	int err;
 
+#ifdef CONFIG_CHELSIO_TLS_DEVICE
+	/* tls offload will be enabled runtime on user request only, we are
+	 * going to inform the same to FW.
+	 */
+	enable = !!((features & NETIF_F_HW_TLS_TX) & dev->hw_features);
+
+	if ((changed & NETIF_F_HW_TLS_TX) &&
+	    (pi->adapter->params.crypto & FW_CAPS_CONFIG_TLS_HW)) {
+		err = cxgb4_set_ktls_feature(pi->adapter, enable);
+		if (err)
+			return err;
+	}
+#endif
+
 	if (!(changed & NETIF_F_HW_VLAN_CTAG_RX))
 		return 0;
 
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c
index 6b1d3df4b9ba..3402f41cae1f 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c
@@ -662,23 +662,72 @@ static int uld_attach(struct adapter *adap, unsigned int uld)
 	return 0;
 }
 
+static bool cxgb4_uld_in_use(struct adapter *adap)
+{
+	const struct tid_info *t = &adap->tids;
+
+	return (atomic_read(&t->conns_in_use) || t->stids_in_use);
+}
+
 #ifdef CONFIG_CHELSIO_TLS_DEVICE
 /* cxgb4_set_ktls_feature: request FW to enable/disable ktls settings.
  * @adap: adapter info
  * @enable: 1 to enable / 0 to disable ktls settings.
  */
-static void cxgb4_set_ktls_feature(struct adapter *adap, bool enable)
+int cxgb4_set_ktls_feature(struct adapter *adap, bool enable)
 {
-	u32 params = (FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_DEV) |
-		      FW_PARAMS_PARAM_X_V(FW_PARAMS_PARAM_DEV_KTLS_TX_HW) |
-		      FW_PARAMS_PARAM_Y_V(enable));
-	int ret = 0;
+	u32 params;
+	int ret;
+
+	params = FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_DEV) |
+		 FW_PARAMS_PARAM_X_V(FW_PARAMS_PARAM_DEV_KTLS_HW) |
+		 FW_PARAMS_PARAM_Y_V(enable) |
+		 FW_PARAMS_PARAM_Z_V(FW_PARAMS_PARAM_DEV_KTLS_HW_USER_ENABLE);
+
+	if (enable) {
+		if (!refcount_read(&adap->chcr_ktls.ktls_refcount)) {
+			/* At this moment if ULD connection are up means, other
+			 * ULD is/are already active, return failure.
+			 */
+			if (cxgb4_uld_in_use(adap)) {
+				dev_warn(adap->pdev_dev,
+					 "ULD connections (tid/stid) active. Can't enable kTLS\n");
+				return -EINVAL;
+			}
+			refcount_set(&adap->chcr_ktls.ktls_refcount, 1);
+			pr_info("kTLS has been enabled. Restrictions placed on ULD support\n");
+		} else {
+			/* ktls settings already up, just increment refcount. */
+			refcount_inc(&adap->chcr_ktls.ktls_refcount);
+			return 0;
+		}
+		/* we shouldn't remove CRYPTO ULD driver until any single
+		 * connection exists. Get ULD module's ref-count.
+		 */
+		try_module_get(adap->uld[CXGB4_ULD_CRYPTO].owner);
+	} else {
+		/* return failure if refcount is already 0. */
+		if (!refcount_read(&adap->chcr_ktls.ktls_refcount))
+			return -EINVAL;
+		/* decrement refcount and test, if 0, disable ktls feature,
+		 * else return command success.
+		 */
+		if (refcount_dec_and_test(&adap->chcr_ktls.ktls_refcount))
+			pr_info("kTLS is disabled. Restrictions on ULD support removed\n");
+		else
+			return 0;
+		/* no more connecton exists, clear module ref count */
+		module_put(adap->uld[CXGB4_ULD_CRYPTO].owner);
+	}
 
 	ret = t4_set_params(adap, adap->mbox, adap->pf, 0, 1, &params, &params);
 	/* if fw returns failure, clear the ktls flag */
 	if (ret)
 		adap->params.crypto &= ~ULP_CRYPTO_KTLS_INLINE;
+
+	return ret;
 }
+EXPORT_SYMBOL(cxgb4_set_ktls_feature);
 #endif
 
 static void cxgb4_uld_alloc_resources(struct adapter *adap,
@@ -705,12 +754,6 @@ static void cxgb4_uld_alloc_resources(struct adapter *adap,
 	}
 	if (adap->flags & CXGB4_FULL_INIT_DONE)
 		enable_rx_uld(adap, type);
-#ifdef CONFIG_CHELSIO_TLS_DEVICE
-	/* send mbox to enable ktls related settings. */
-	if (type == CXGB4_ULD_CRYPTO &&
-	    (adap->params.crypto & FW_CAPS_CONFIG_TX_TLS_HW))
-		cxgb4_set_ktls_feature(adap, 1);
-#endif
 	if (adap->uld[type].add)
 		goto free_irq;
 	ret = setup_sge_txq_uld(adap, type, p);
@@ -804,13 +847,6 @@ int cxgb4_unregister_uld(enum cxgb4_uld type)
 			continue;
 
 		cxgb4_shutdown_uld_adapter(adap, type);
-
-#ifdef CONFIG_CHELSIO_TLS_DEVICE
-		/* send mbox to disable ktls related settings. */
-		if (type == CXGB4_ULD_CRYPTO &&
-		    (adap->params.crypto & FW_CAPS_CONFIG_TX_TLS_HW))
-			cxgb4_set_ktls_feature(adap, 0);
-#endif
 	}
 
 	list_for_each_entry_safe(uld_entry, tmp, &uld_list, list_node) {
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.h b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.h
index 085fa1424f9a..8af6ba12fe57 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.h
@@ -268,6 +268,10 @@ struct filter_ctx {
 	u32 tid;			/* to store tid */
 };
 
+struct chcr_ktls {
+	refcount_t ktls_refcount;
+};
+
 struct ch_filter_specification;
 
 int cxgb4_get_free_ftid(struct net_device *dev, u8 family, bool hash_en,
@@ -446,6 +450,7 @@ struct cxgb4_lld_info {
 };
 
 struct cxgb4_uld_info {
+	struct module *owner;
 	char name[IFNAMSIZ];
 	void *handle;
 	unsigned int nrxq;
diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4fw_api.h b/drivers/net/ethernet/chelsio/cxgb4/t4fw_api.h
index 68fe734b9b37..0a326c054707 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/t4fw_api.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4fw_api.h
@@ -1205,7 +1205,7 @@ enum fw_caps_config_crypto {
 	FW_CAPS_CONFIG_CRYPTO_LOOKASIDE = 0x00000001,
 	FW_CAPS_CONFIG_TLS_INLINE = 0x00000002,
 	FW_CAPS_CONFIG_IPSEC_INLINE = 0x00000004,
-	FW_CAPS_CONFIG_TX_TLS_HW = 0x00000008,
+	FW_CAPS_CONFIG_TLS_HW = 0x00000008,
 };
 
 enum fw_caps_config_fcoe {
@@ -1329,7 +1329,7 @@ enum fw_params_param_dev {
 	FW_PARAMS_PARAM_DEV_DBQ_TIMERTICK = 0x2A,
 	FW_PARAMS_PARAM_DEV_NUM_TM_CLASS = 0x2B,
 	FW_PARAMS_PARAM_DEV_FILTER = 0x2E,
-	FW_PARAMS_PARAM_DEV_KTLS_TX_HW = 0x31,
+	FW_PARAMS_PARAM_DEV_KTLS_HW = 0x31,
 };
 
 /*
@@ -1412,6 +1412,12 @@ enum fw_params_param_dmaq {
 	FW_PARAMS_PARAM_DMAQ_CONM_CTXT = 0x20,
 };
 
+enum fw_params_param_dev_ktls_hw {
+	FW_PARAMS_PARAM_DEV_KTLS_HW_DISABLE      = 0x00,
+	FW_PARAMS_PARAM_DEV_KTLS_HW_ENABLE       = 0x01,
+	FW_PARAMS_PARAM_DEV_KTLS_HW_USER_ENABLE  = 0x01,
+};
+
 enum fw_params_param_dev_phyfw {
 	FW_PARAMS_PARAM_DEV_PHYFW_DOWNLOAD = 0x00,
 	FW_PARAMS_PARAM_DEV_PHYFW_VERSION = 0x01,
-- 
2.18.1

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