nfp: add shared buffer configuration

Allow app FW to advertise its shared buffer pool information.
Use the per-PF mailbox to configure them from devlink.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/Makefile

@@ -30,6 +30,7 @@ nfp-objs := \
 	    nfp_net_sriov.o \
 	    nfp_netvf_main.o \
 	    nfp_port.o \
+	    nfp_shared_buf.o \
 	    nic/main.o
 
 ifeq ($(CONFIG_NFP_APP_FLOWER),y)

drivers/net/ethernet/netronome/nfp/nfp_abi.h

@@ -51,9 +51,79 @@
  *
  * @NFP_MBOX_NO_CMD:	null command
  * Used to indicate previous command has finished.
+ *
+ * @NFP_MBOX_POOL_GET:	get shared buffer pool info/config
+ * Input  - struct nfp_shared_buf_pool_id
+ * Output - struct nfp_shared_buf_pool_info_get
+ *
+ * @NFP_MBOX_POOL_SET:	set shared buffer pool info/config
+ * Input  - struct nfp_shared_buf_pool_info_set
+ * Output - None
  */
 enum nfp_mbox_cmd {
 	NFP_MBOX_NO_CMD			= 0x00,
+
+	NFP_MBOX_POOL_GET		= 0x01,
+	NFP_MBOX_POOL_SET		= 0x02,
+};
+
+#define NFP_SHARED_BUF_COUNT_SYM_NAME	"_abi_nfd_pf%u_sb_cnt"
+#define NFP_SHARED_BUF_TABLE_SYM_NAME	"_abi_nfd_pf%u_sb_tbl"
+
+/**
+ * struct nfp_shared_buf - NFP shared buffer description
+ * @id:				numerical user-visible id of the shared buffer
+ * @size:			size in bytes of the buffer
+ * @ingress_pools_count:	number of ingress pools
+ * @egress_pools_count:		number of egress pools
+ * @ingress_tc_count:		number of ingress trafic classes
+ * @egress_tc_count:		number of egress trafic classes
+ * @pool_size_unit:		pool size may be in credits, each credit is
+ *				@pool_size_unit bytes
+ */
+struct nfp_shared_buf {
+	__le32 id;
+	__le32 size;
+	__le16 ingress_pools_count;
+	__le16 egress_pools_count;
+	__le16 ingress_tc_count;
+	__le16 egress_tc_count;
+
+	__le32 pool_size_unit;
+};
+
+/**
+ * struct nfp_shared_buf_pool_id - shared buffer pool identification
+ * @shared_buf:		shared buffer id
+ * @pool:		pool index
+ */
+struct nfp_shared_buf_pool_id {
+	__le32 shared_buf;
+	__le32 pool;
+};
+
+/**
+ * struct nfp_shared_buf_pool_info_get - struct devlink_sb_pool_info mirror
+ * @pool_type:		one of enum devlink_sb_pool_type
+ * @size:		pool size in units of SB's @pool_size_unit
+ * @threshold_type:	one of enum devlink_sb_threshold_type
+ */
+struct nfp_shared_buf_pool_info_get {
+	__le32 pool_type;
+	__le32 size;
+	__le32 threshold_type;
+};
+
+/**
+ * struct nfp_shared_buf_pool_info_set - packed args of sb_pool_set
+ * @id:			pool identification info
+ * @size:		pool size in units of SB's @pool_size_unit
+ * @threshold_type:	one of enum devlink_sb_threshold_type
+ */
+struct nfp_shared_buf_pool_info_set {
+	struct nfp_shared_buf_pool_id id;
+	__le32 size;
+	__le32 threshold_type;
 };
 
 #endif

drivers/net/ethernet/netronome/nfp/nfp_devlink.c

@@ -149,6 +149,26 @@ nfp_devlink_port_unsplit(struct devlink *devlink, unsigned int port_index)
 	return ret;
 }
 
+static int
+nfp_devlink_sb_pool_get(struct devlink *devlink, unsigned int sb_index,
+			u16 pool_index, struct devlink_sb_pool_info *pool_info)
+{
+	struct nfp_pf *pf = devlink_priv(devlink);
+
+	return nfp_shared_buf_pool_get(pf, sb_index, pool_index, pool_info);
+}
+
+static int
+nfp_devlink_sb_pool_set(struct devlink *devlink, unsigned int sb_index,
+			u16 pool_index,
+			u32 size, enum devlink_sb_threshold_type threshold_type)
+{
+	struct nfp_pf *pf = devlink_priv(devlink);
+
+	return nfp_shared_buf_pool_set(pf, sb_index, pool_index,
+				       size, threshold_type);
+}
+
 static int nfp_devlink_eswitch_mode_get(struct devlink *devlink, u16 *mode)
 {
 	struct nfp_pf *pf = devlink_priv(devlink);
@@ -159,6 +179,8 @@ static int nfp_devlink_eswitch_mode_get(struct devlink *devlink, u16 *mode)
 const struct devlink_ops nfp_devlink_ops = {
 	.port_split		= nfp_devlink_port_split,
 	.port_unsplit		= nfp_devlink_port_unsplit,
+	.sb_pool_get		= nfp_devlink_sb_pool_get,
+	.sb_pool_set		= nfp_devlink_sb_pool_set,
 	.eswitch_mode_get	= nfp_devlink_eswitch_mode_get,
 };
 

drivers/net/ethernet/netronome/nfp/nfp_main.h

@@ -46,10 +46,10 @@
 #include <linux/mutex.h>
 #include <linux/pci.h>
 #include <linux/workqueue.h>
+#include <net/devlink.h>
 
 struct dentry;
 struct device;
-struct devlink_ops;
 struct pci_dev;
 
 struct nfp_cpp;
@@ -62,6 +62,7 @@ struct nfp_nsp_identify;
 struct nfp_port;
 struct nfp_rtsym;
 struct nfp_rtsym_table;
+struct nfp_shared_buf;
 
 /**
  * struct nfp_dumpspec - NFP FW dump specification structure
@@ -110,6 +111,8 @@ struct nfp_dumpspec {
  * @ports:		Linked list of port structures (struct nfp_port)
  * @wq:			Workqueue for running works which need to grab @lock
  * @port_refresh_work:	Work entry for taking netdevs out
+ * @shared_bufs:	Array of shared buffer structures if FW has any SBs
+ * @num_shared_bufs:	Number of elements in @shared_bufs
  * @lock:		Protects all fields which may change after probe
  */
 struct nfp_pf {
@@ -162,6 +165,9 @@ struct nfp_pf {
 	struct workqueue_struct *wq;
 	struct work_struct port_refresh_work;
 
+	struct nfp_shared_buf *shared_bufs;
+	unsigned int num_shared_bufs;
+
 	struct mutex lock;
 };
 
@@ -200,4 +206,11 @@ s64 nfp_net_dump_calculate_size(struct nfp_pf *pf, struct nfp_dumpspec *spec,
 int nfp_net_dump_populate_buffer(struct nfp_pf *pf, struct nfp_dumpspec *spec,
 				 struct ethtool_dump *dump_param, void *dest);
 
+int nfp_shared_buf_register(struct nfp_pf *pf);
+void nfp_shared_buf_unregister(struct nfp_pf *pf);
+int nfp_shared_buf_pool_get(struct nfp_pf *pf, unsigned int sb, u16 pool_index,
+			    struct devlink_sb_pool_info *pool_info);
+int nfp_shared_buf_pool_set(struct nfp_pf *pf, unsigned int sb,
+			    u16 pool_index, u32 size,
+			    enum devlink_sb_threshold_type threshold_type);
 #endif /* NFP_MAIN_H */

drivers/net/ethernet/netronome/nfp/nfp_net_main.c

@@ -728,6 +728,10 @@ int nfp_net_pci_probe(struct nfp_pf *pf)
 	if (err)
 		goto err_app_clean;
 
+	err = nfp_shared_buf_register(pf);
+	if (err)
+		goto err_devlink_unreg;
+
 	mutex_lock(&pf->lock);
 	pf->ddir = nfp_net_debugfs_device_add(pf->pdev);
 
@@ -761,6 +765,8 @@ int nfp_net_pci_probe(struct nfp_pf *pf)
 err_clean_ddir:
 	nfp_net_debugfs_dir_clean(&pf->ddir);
 	mutex_unlock(&pf->lock);
+	nfp_shared_buf_unregister(pf);
+err_devlink_unreg:
 	cancel_work_sync(&pf->port_refresh_work);
 	devlink_unregister(devlink);
 err_app_clean:
@@ -788,6 +794,7 @@ void nfp_net_pci_remove(struct nfp_pf *pf)
 
 	mutex_unlock(&pf->lock);
 
+	nfp_shared_buf_unregister(pf);
 	devlink_unregister(priv_to_devlink(pf));
 
 	nfp_net_pf_free_irqs(pf);

drivers/net/ethernet/netronome/nfp/nfp_shared_buf.c

@@ -0,0 +1,180 @@
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+/*
+ * Copyright (C) 2018 Netronome Systems, Inc.
+ *
+ * This software is dual licensed under the GNU General License Version 2,
+ * June 1991 as shown in the file COPYING in the top-level directory of this
+ * source tree or the BSD 2-Clause License provided below.  You have the
+ * option to license this software under the complete terms of either license.
+ *
+ * The BSD 2-Clause License:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      1. Redistributions of source code must retain the above
+ *         copyright notice, this list of conditions and the following
+ *         disclaimer.
+ *
+ *      2. Redistributions in binary form must reproduce the above
+ *         copyright notice, this list of conditions and the following
+ *         disclaimer in the documentation and/or other materials
+ *         provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/kernel.h>
+#include <net/devlink.h>
+
+#include "nfpcore/nfp_cpp.h"
+#include "nfpcore/nfp_nffw.h"
+#include "nfp_abi.h"
+#include "nfp_app.h"
+#include "nfp_main.h"
+
+static u32 nfp_shared_buf_pool_unit(struct nfp_pf *pf, unsigned int sb)
+{
+	__le32 sb_id = cpu_to_le32(sb);
+	unsigned int i;
+
+	for (i = 0; i < pf->num_shared_bufs; i++)
+		if (pf->shared_bufs[i].id == sb_id)
+			return le32_to_cpu(pf->shared_bufs[i].pool_size_unit);
+
+	WARN_ON_ONCE(1);
+	return 0;
+}
+
+int nfp_shared_buf_pool_get(struct nfp_pf *pf, unsigned int sb, u16 pool_index,
+			    struct devlink_sb_pool_info *pool_info)
+{
+	struct nfp_shared_buf_pool_info_get get_data;
+	struct nfp_shared_buf_pool_id id = {
+		.shared_buf	= cpu_to_le32(sb),
+		.pool		= cpu_to_le32(pool_index),
+	};
+	unsigned int unit_size;
+	int n;
+
+	unit_size = nfp_shared_buf_pool_unit(pf, sb);
+	if (!unit_size)
+		return -EINVAL;
+
+	n = nfp_mbox_cmd(pf, NFP_MBOX_POOL_GET, &id, sizeof(id),
+			 &get_data, sizeof(get_data));
+	if (n < 0)
+		return n;
+	if (n < sizeof(get_data))
+		return -EIO;
+
+	pool_info->pool_type = le32_to_cpu(get_data.pool_type);
+	pool_info->threshold_type = le32_to_cpu(get_data.threshold_type);
+	pool_info->size = le32_to_cpu(get_data.size) * unit_size;
+
+	return 0;
+}
+
+int nfp_shared_buf_pool_set(struct nfp_pf *pf, unsigned int sb,
+			    u16 pool_index, u32 size,
+			    enum devlink_sb_threshold_type threshold_type)
+{
+	struct nfp_shared_buf_pool_info_set set_data = {
+		.id = {
+			.shared_buf	= cpu_to_le32(sb),
+			.pool		= cpu_to_le32(pool_index),
+		},
+		.threshold_type	= cpu_to_le32(threshold_type),
+	};
+	unsigned int unit_size;
+
+	unit_size = nfp_shared_buf_pool_unit(pf, sb);
+	if (!unit_size || size % unit_size)
+		return -EINVAL;
+	set_data.size = cpu_to_le32(size / unit_size);
+
+	return nfp_mbox_cmd(pf, NFP_MBOX_POOL_SET, &set_data, sizeof(set_data),
+			    NULL, 0);
+}
+
+int nfp_shared_buf_register(struct nfp_pf *pf)
+{
+	struct devlink *devlink = priv_to_devlink(pf);
+	unsigned int i, num_entries, entry_sz;
+	struct nfp_cpp_area *sb_desc_area;
+	u8 __iomem *sb_desc;
+	int n, err;
+
+	if (!pf->mbox)
+		return 0;
+
+	n = nfp_pf_rtsym_read_optional(pf, NFP_SHARED_BUF_COUNT_SYM_NAME, 0);
+	if (n <= 0)
+		return n;
+	num_entries = n;
+
+	sb_desc = nfp_pf_map_rtsym(pf, "sb_tbl", NFP_SHARED_BUF_TABLE_SYM_NAME,
+				   num_entries * sizeof(pf->shared_bufs[0]),
+				   &sb_desc_area);
+	if (IS_ERR(sb_desc))
+		return PTR_ERR(sb_desc);
+
+	entry_sz = nfp_cpp_area_size(sb_desc_area) / num_entries;
+
+	pf->shared_bufs = kmalloc_array(num_entries, sizeof(pf->shared_bufs[0]),
+					GFP_KERNEL);
+	if (!pf->shared_bufs) {
+		err = -ENOMEM;
+		goto err_release_area;
+	}
+
+	for (i = 0; i < num_entries; i++) {
+		struct nfp_shared_buf *sb = &pf->shared_bufs[i];
+
+		/* Entries may be larger in future FW */
+		memcpy_fromio(sb, sb_desc + i * entry_sz, sizeof(*sb));
+
+		err = devlink_sb_register(devlink,
+					  le32_to_cpu(sb->id),
+					  le32_to_cpu(sb->size),
+					  le16_to_cpu(sb->ingress_pools_count),
+					  le16_to_cpu(sb->egress_pools_count),
+					  le16_to_cpu(sb->ingress_tc_count),
+					  le16_to_cpu(sb->egress_tc_count));
+		if (err)
+			goto err_unreg_prev;
+	}
+	pf->num_shared_bufs = num_entries;
+
+	nfp_cpp_area_release_free(sb_desc_area);
+
+	return 0;
+
+err_unreg_prev:
+	while (i--)
+		devlink_sb_unregister(devlink,
+				      le32_to_cpu(pf->shared_bufs[i].id));
+	kfree(pf->shared_bufs);
+err_release_area:
+	nfp_cpp_area_release_free(sb_desc_area);
+	return err;
+}
+
+void nfp_shared_buf_unregister(struct nfp_pf *pf)
+{
+	struct devlink *devlink = priv_to_devlink(pf);
+	unsigned int i;
+
+	for (i = 0; i < pf->num_shared_bufs; i++)
+		devlink_sb_unregister(devlink,
+				      le32_to_cpu(pf->shared_bufs[i].id));
+	kfree(pf->shared_bufs);
+}