[dpdk-dev] [PATCH v2 1/2] net/nfp: improve PF probing logic

[dpdk-dev] [PATCH v2 1/2] net/nfp: improve PF probing logic

[Heinrich Kuhn]

When using rte_eth_dev_pci_generic_probe() during probing a
rte_eth_dev will be created with the name field corresponding to the PCI
address of the device. NFP4000/6000 devices only have a single PF (but
potentially multiple physical ports). This means that in a simple two
port example the rte_eth_devices[] array will be populated with two
devices: 0000:02:00.0 and 0000:02:00.0_port1. This is inconsistent and
not ideal. It will also cause issues when a secondary process tries to
attach to these ports.

This patch removes the use of rte_eth_dev_pci_generic_probe() and
allocates eth_dev's for each physical port during PF initialization,
giving them more consistent names.

Fixes: 5e15e799d697 ("net/nfp: create separate entity for PF device")

Signed-off-by: Heinrich Kuhn <heinrich.kuhn@netronome.com>
Signed-off-by: Simon Horman <simon.horman@corigine.com>
---
 drivers/net/nfp/nfp_net.c     | 31 ++++++++-----------------------
 drivers/net/nfp/nfp_net_pmd.h |  3 ---
 2 files changed, 8 insertions(+), 26 deletions(-)

diff --git a/drivers/net/nfp/nfp_net.c b/drivers/net/nfp/nfp_net.c
index 2ee88fbfc7..d94c8dc727 100644
--- a/drivers/net/nfp/nfp_net.c
+++ b/drivers/net/nfp/nfp_net.c
@@ -58,7 +58,7 @@ static int nfp_net_dev_mtu_set(struct rte_eth_dev *dev, uint16_t mtu);
 static int nfp_net_infos_get(struct rte_eth_dev *dev,
 			     struct rte_eth_dev_info *dev_info);
 static int nfp_net_init(struct rte_eth_dev *eth_dev);
-static int nfp_pf_init(struct rte_eth_dev *eth_dev);
+static int nfp_pf_init(struct rte_pci_device *pci_dev);
 static int nfp_pci_uninit(struct rte_eth_dev *eth_dev);
 static int nfp_init_phyports(struct nfp_pf_dev *pf_dev);
 static int nfp_net_link_update(struct rte_eth_dev *dev, int wait_to_complete);
@@ -3530,20 +3530,14 @@ static int nfp_init_phyports(struct nfp_pf_dev *pf_dev)
 			goto nfp_net_init;
 		}
 
-		/* First port has already been initialized */
-		if (i == 0) {
-			eth_dev = pf_dev->eth_dev;
-			goto skip_dev_alloc;
-		}
-
-		/* Allocate a eth_dev for remaining ports */
+		/* Allocate a eth_dev for this phyport */
 		eth_dev = rte_eth_dev_allocate(port_name);
 		if (!eth_dev) {
 			ret = -ENODEV;
 			goto port_cleanup;
 		}
 
-		/* Allocate memory for remaining ports */
+		/* Allocate memory for this phyport */
 		eth_dev->data->dev_private =
 			rte_zmalloc_socket(port_name, sizeof(struct nfp_net_hw),
 					   RTE_CACHE_LINE_SIZE, numa_node);
@@ -3553,7 +3547,6 @@ static int nfp_init_phyports(struct nfp_pf_dev *pf_dev)
 			goto port_cleanup;
 		}
 
-skip_dev_alloc:
 		hw = NFP_NET_DEV_PRIVATE_TO_HW(eth_dev->data->dev_private);
 
 		/* Add this device to the PF's array of physical ports */
@@ -3600,24 +3593,20 @@ static int nfp_init_phyports(struct nfp_pf_dev *pf_dev)
 	return ret;
 }
 
-static int nfp_pf_init(struct rte_eth_dev *eth_dev)
+static int nfp_pf_init(struct rte_pci_device *pci_dev)
 {
-	struct rte_pci_device *pci_dev;
-	struct nfp_net_hw *hw = NULL;
 	struct nfp_pf_dev *pf_dev = NULL;
 	struct nfp_cpp *cpp;
 	struct nfp_hwinfo *hwinfo;
 	struct nfp_rtsym_table *sym_tbl;
 	struct nfp_eth_table *nfp_eth_table = NULL;
 	struct rte_service_spec service;
+	uint32_t *nfp_cpp_service_id = NULL;
 	char name[RTE_ETH_NAME_MAX_LEN];
 	int total_ports;
 	int ret = -ENODEV;
 	int err;
 
-	pci_dev = RTE_ETH_DEV_TO_PCI(eth_dev);
-	hw = NFP_NET_DEV_PRIVATE_TO_HW(eth_dev);
-
 	if (!pci_dev)
 		return ret;
 
@@ -3685,7 +3674,7 @@ static int nfp_pf_init(struct rte_eth_dev *eth_dev)
 		goto sym_tbl_cleanup;
 	}
 	/* Allocate memory for the PF "device" */
-	snprintf(name, sizeof(name), "nfp_pf%d", eth_dev->data->port_id);
+	snprintf(name, sizeof(name), "nfp_pf%d", 0);
 	pf_dev = rte_zmalloc(name, sizeof(*pf_dev), 0);
 	if (!pf_dev) {
 		ret = -ENOMEM;
@@ -3703,9 +3692,6 @@ static int nfp_pf_init(struct rte_eth_dev *eth_dev)
 
 	pf_dev->pci_dev = pci_dev;
 
-	/* The first eth_dev is part of the PF struct */
-	pf_dev->eth_dev = eth_dev;
-
 	/* Map the symbol table */
 	pf_dev->ctrl_bar = nfp_rtsym_map(pf_dev->sym_tbl, "_pf0_net_bar0",
 				     pf_dev->total_phyports * 32768,
@@ -3754,7 +3740,7 @@ static int nfp_pf_init(struct rte_eth_dev *eth_dev)
 	service.callback_userdata = (void *)cpp;
 
 	if (rte_service_component_register(&service,
-					   &hw->nfp_cpp_service_id))
+					   nfp_cpp_service_id))
 		RTE_LOG(ERR, PMD, "NFP CPP bridge service register() failed");
 	else
 		RTE_LOG(DEBUG, PMD, "NFP CPP bridge service registered");
@@ -3780,8 +3766,7 @@ static int nfp_pf_init(struct rte_eth_dev *eth_dev)
 static int nfp_pf_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
 			    struct rte_pci_device *dev)
 {
-	return rte_eth_dev_pci_generic_probe(dev,
-		sizeof(struct nfp_net_hw), nfp_pf_init);
+	return nfp_pf_init(dev);
 }
 
 static const struct rte_pci_id pci_id_nfp_pf_net_map[] = {
diff --git a/drivers/net/nfp/nfp_net_pmd.h b/drivers/net/nfp/nfp_net_pmd.h
index b1303b13f5..212f9ef162 100644
--- a/drivers/net/nfp/nfp_net_pmd.h
+++ b/drivers/net/nfp/nfp_net_pmd.h
@@ -389,9 +389,6 @@ struct nfp_pf_dev {
 	/* Backpointer to associated pci device */
 	struct rte_pci_device *pci_dev;
 
-	/* First physical port's eth device */
-	struct rte_eth_dev *eth_dev;
-
 	/* Array of physical ports belonging to this PF */
 	struct nfp_net_hw *ports[NFP_MAX_PHYPORTS];
 
-- 
2.30.1 (Apple Git-130)

[dpdk-dev] [PATCH v2 2/2] net/nfp: fix PF secondary process probing

[Heinrich Kuhn]

This patch creates a new function for handling PF probing of a secondary
process. A CPP handle is obtained for the CPP bridge service and the
service itself is also registered during secondary process
initialization. DPDK services aren't shared between processes so it is
not enough to only have the primary register the service if it is also
needed in a secondary process. This implies that both the primary and
secondary will have their own copy of the bridge service.

Fixes: 5e15e799d697 ("net/nfp: create separate entity for PF device")

Signed-off-by: Heinrich Kuhn <heinrich.kuhn@netronome.com>
Signed-off-by: Simon Horman <simon.horman@corigine.com>
---
 drivers/net/nfp/nfp_net.c | 147 +++++++++++++++++++++++++++-----------
 1 file changed, 105 insertions(+), 42 deletions(-)

diff --git a/drivers/net/nfp/nfp_net.c b/drivers/net/nfp/nfp_net.c
index d94c8dc727..b18edd8c7b 100644
--- a/drivers/net/nfp/nfp_net.c
+++ b/drivers/net/nfp/nfp_net.c
@@ -59,6 +59,7 @@ static int nfp_net_infos_get(struct rte_eth_dev *dev,
 			     struct rte_eth_dev_info *dev_info);
 static int nfp_net_init(struct rte_eth_dev *eth_dev);
 static int nfp_pf_init(struct rte_pci_device *pci_dev);
+static int nfp_pf_secondary_init(struct rte_pci_device *pci_dev);
 static int nfp_pci_uninit(struct rte_eth_dev *eth_dev);
 static int nfp_init_phyports(struct nfp_pf_dev *pf_dev);
 static int nfp_net_link_update(struct rte_eth_dev *dev, int wait_to_complete);
@@ -98,6 +99,7 @@ static int nfp_net_rss_hash_write(struct rte_eth_dev *dev,
 static int nfp_set_mac_addr(struct rte_eth_dev *dev,
 			     struct rte_ether_addr *mac_addr);
 static int32_t nfp_cpp_bridge_service_func(void *args);
+static void nfp_register_cpp_service(struct nfp_cpp *cpp);
 static int nfp_fw_setup(struct rte_pci_device *dev,
 			struct nfp_cpp *cpp,
 			struct nfp_eth_table *nfp_eth_table,
@@ -3516,20 +3518,6 @@ static int nfp_init_phyports(struct nfp_pf_dev *pf_dev)
 		snprintf(port_name, sizeof(port_name), "%s_port%d",
 			 pf_dev->pci_dev->device.name, i);
 
-		if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
-			eth_dev = rte_eth_dev_attach_secondary(port_name);
-			if (!eth_dev) {
-				RTE_LOG(ERR, EAL,
-				"secondary process attach failed, "
-				"ethdev doesn't exist");
-				ret = -ENODEV;
-				goto error;
-			}
-
-			eth_dev->process_private = pf_dev->cpp;
-			goto nfp_net_init;
-		}
-
 		/* Allocate a eth_dev for this phyport */
 		eth_dev = rte_eth_dev_allocate(port_name);
 		if (!eth_dev) {
@@ -3559,7 +3547,6 @@ static int nfp_init_phyports(struct nfp_pf_dev *pf_dev)
 		hw->nfp_idx = nfp_eth_table->ports[i].index;
 		hw->is_phyport = true;
 
-nfp_net_init:
 		eth_dev->device = &pf_dev->pci_dev->device;
 
 		/* ctrl/tx/rx BAR mappings and remaining init happens in
@@ -3593,6 +3580,23 @@ static int nfp_init_phyports(struct nfp_pf_dev *pf_dev)
 	return ret;
 }
 
+static void nfp_register_cpp_service(struct nfp_cpp *cpp)
+{
+	uint32_t *cpp_service_id = NULL;
+	struct rte_service_spec service;
+
+	memset(&service, 0, sizeof(struct rte_service_spec));
+	snprintf(service.name, sizeof(service.name), "nfp_cpp_service");
+	service.callback = nfp_cpp_bridge_service_func;
+	service.callback_userdata = (void *)cpp;
+
+	if (rte_service_component_register(&service,
+					   cpp_service_id))
+		RTE_LOG(WARNING, PMD, "NFP CPP bridge service register() failed");
+	else
+		RTE_LOG(DEBUG, PMD, "NFP CPP bridge service registered");
+}
+
 static int nfp_pf_init(struct rte_pci_device *pci_dev)
 {
 	struct nfp_pf_dev *pf_dev = NULL;
@@ -3600,8 +3604,6 @@ static int nfp_pf_init(struct rte_pci_device *pci_dev)
 	struct nfp_hwinfo *hwinfo;
 	struct nfp_rtsym_table *sym_tbl;
 	struct nfp_eth_table *nfp_eth_table = NULL;
-	struct rte_service_spec service;
-	uint32_t *nfp_cpp_service_id = NULL;
 	char name[RTE_ETH_NAME_MAX_LEN];
 	int total_ports;
 	int ret = -ENODEV;
@@ -3642,12 +3644,10 @@ static int nfp_pf_init(struct rte_pci_device *pci_dev)
 		goto hwinfo_cleanup;
 	}
 
-	if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
-		if (nfp_fw_setup(pci_dev, cpp, nfp_eth_table, hwinfo)) {
-			PMD_INIT_LOG(ERR, "Error when uploading firmware");
-			ret = -EIO;
-			goto eth_table_cleanup;
-		}
+	if (nfp_fw_setup(pci_dev, cpp, nfp_eth_table, hwinfo)) {
+		PMD_INIT_LOG(ERR, "Error when uploading firmware");
+		ret = -EIO;
+		goto eth_table_cleanup;
 	}
 
 	/* Now the symbol table should be there */
@@ -3726,24 +3726,8 @@ static int nfp_pf_init(struct rte_pci_device *pci_dev)
 		goto hwqueues_cleanup;
 	}
 
-	/*
-	 * The rte_service needs to be created just once per PMD.
-	 * And the cpp handler needs to be linked to the service.
-	 * Secondary processes will be used for debugging DPDK apps
-	 * when requiring to use the CPP interface for accessing NFP
-	 * components. And the cpp handler for secondary processes is
-	 * available at this point.
-	 */
-	memset(&service, 0, sizeof(struct rte_service_spec));
-	snprintf(service.name, sizeof(service.name), "nfp_cpp_service");
-	service.callback = nfp_cpp_bridge_service_func;
-	service.callback_userdata = (void *)cpp;
-
-	if (rte_service_component_register(&service,
-					   nfp_cpp_service_id))
-		RTE_LOG(ERR, PMD, "NFP CPP bridge service register() failed");
-	else
-		RTE_LOG(DEBUG, PMD, "NFP CPP bridge service registered");
+	/* register the CPP bridge service here for primary use */
+	nfp_register_cpp_service(pf_dev->cpp);
 
 	return 0;
 
@@ -3763,10 +3747,89 @@ static int nfp_pf_init(struct rte_pci_device *pci_dev)
 	return ret;
 }
 
+/*
+ * When attaching to the NFP4000/6000 PF on a secondary process there
+ * is no need to initialize the PF again. Only minimal work is required
+ * here
+ */
+static int nfp_pf_secondary_init(struct rte_pci_device *pci_dev)
+{
+	struct nfp_cpp *cpp;
+	struct nfp_rtsym_table *sym_tbl;
+	int total_ports;
+	int i;
+	int err;
+
+	if (!pci_dev)
+		return -ENODEV;
+
+	/*
+	 * When device bound to UIO, the device could be used, by mistake,
+	 * by two DPDK apps, and the UIO driver does not avoid it. This
+	 * could lead to a serious problem when configuring the NFP CPP
+	 * interface. Here we avoid this telling to the CPP init code to
+	 * use a lock file if UIO is being used.
+	 */
+	if (pci_dev->kdrv == RTE_PCI_KDRV_VFIO)
+		cpp = nfp_cpp_from_device_name(pci_dev, 0);
+	else
+		cpp = nfp_cpp_from_device_name(pci_dev, 1);
+
+	if (!cpp) {
+		PMD_INIT_LOG(ERR, "A CPP handle can not be obtained");
+		return -EIO;
+	}
+
+	/*
+	 * We don't have access to the PF created in the primary process
+	 * here so we have to read the number of ports from firmware
+	 */
+	sym_tbl = nfp_rtsym_table_read(cpp);
+	if (!sym_tbl) {
+		PMD_INIT_LOG(ERR, "Something is wrong with the firmware"
+				" symbol table");
+		return -EIO;
+	}
+
+	total_ports = nfp_rtsym_read_le(sym_tbl, "nfd_cfg_pf0_num_ports", &err);
+
+	for (i = 0; i < total_ports; i++) {
+		struct rte_eth_dev *eth_dev;
+		char port_name[RTE_ETH_NAME_MAX_LEN];
+
+		snprintf(port_name, sizeof(port_name), "%s_port%d",
+			 pci_dev->device.name, i);
+
+		PMD_DRV_LOG(DEBUG, "Secondary attaching to port %s",
+		    port_name);
+		eth_dev = rte_eth_dev_attach_secondary(port_name);
+		if (!eth_dev) {
+			RTE_LOG(ERR, EAL,
+			"secondary process attach failed, "
+			"ethdev doesn't exist");
+			return -ENODEV;
+		}
+		eth_dev->process_private = cpp;
+		eth_dev->dev_ops = &nfp_net_eth_dev_ops;
+		eth_dev->rx_queue_count = nfp_net_rx_queue_count;
+		eth_dev->rx_pkt_burst = &nfp_net_recv_pkts;
+		eth_dev->tx_pkt_burst = &nfp_net_xmit_pkts;
+		rte_eth_dev_probing_finish(eth_dev);
+	}
+
+	/* Register the CPP bridge service for the secondary too */
+	nfp_register_cpp_service(cpp);
+
+	return 0;
+}
+
 static int nfp_pf_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
 			    struct rte_pci_device *dev)
 {
-	return nfp_pf_init(dev);
+	if (rte_eal_process_type() == RTE_PROC_PRIMARY)
+		return nfp_pf_init(dev);
+	else
+		return nfp_pf_secondary_init(dev);
 }
 
 static const struct rte_pci_id pci_id_nfp_pf_net_map[] = {
-- 
2.30.1 (Apple Git-130)

Re: [dpdk-dev] [PATCH v2 2/2] net/nfp: fix PF secondary process probing

[Andrew Rybchenko]

On 6/9/21 5:08 PM, Heinrich Kuhn wrote:
> This patch creates a new function for handling PF probing of a secondary
> process. A CPP handle is obtained for the CPP bridge service and the
> service itself is also registered during secondary process
> initialization. DPDK services aren't shared between processes so it is
> not enough to only have the primary register the service if it is also
> needed in a secondary process. This implies that both the primary and
> secondary will have their own copy of the bridge service.
> 
> Fixes: 5e15e799d697 ("net/nfp: create separate entity for PF device")
> 
> Signed-off-by: Heinrich Kuhn <heinrich.kuhn@netronome.com>
> Signed-off-by: Simon Horman <simon.horman@corigine.com>

Cc: stable@dpdk.org

Applied, thanks

Re: [dpdk-dev] [PATCH v2 1/2] net/nfp: improve PF probing logic

[Andrew Rybchenko]

On 6/9/21 5:08 PM, Heinrich Kuhn wrote:
> When using rte_eth_dev_pci_generic_probe() during probing a
> rte_eth_dev will be created with the name field corresponding to the PCI
> address of the device. NFP4000/6000 devices only have a single PF (but
> potentially multiple physical ports). This means that in a simple two
> port example the rte_eth_devices[] array will be populated with two
> devices: 0000:02:00.0 and 0000:02:00.0_port1. This is inconsistent and
> not ideal. It will also cause issues when a secondary process tries to
> attach to these ports.
> 
> This patch removes the use of rte_eth_dev_pci_generic_probe() and
> allocates eth_dev's for each physical port during PF initialization,
> giving them more consistent names.
> 
> Fixes: 5e15e799d697 ("net/nfp: create separate entity for PF device")
> 
> Signed-off-by: Heinrich Kuhn <heinrich.kuhn@netronome.com>
> Signed-off-by: Simon Horman <simon.horman@corigine.com>

Cc: stable@dpdk.org

Applied, thanks