nfp: add support for control messages for flower app
authorSimon Horman <simon.horman@netronome.com>
Fri, 23 Jun 2017 20:12:07 +0000 (22:12 +0200)
committerDavid S. Miller <davem@davemloft.net>
Sun, 25 Jun 2017 15:42:01 +0000 (11:42 -0400)
In preparation for adding a new flower app - targeted at offloading
the flower classifier - provide support for control message that it will
use to communicate with the NFP.

Based in part on work by Bert van Leeuwen.

Signed-off-by: Simon Horman <simon.horman@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/ethernet/netronome/nfp/Makefile
drivers/net/ethernet/netronome/nfp/flower/cmsg.c [new file with mode: 0644]
drivers/net/ethernet/netronome/nfp/flower/cmsg.h [new file with mode: 0644]
drivers/net/ethernet/netronome/nfp/nfp_app.c
drivers/net/ethernet/netronome/nfp/nfp_app.h

index a401113..e14f628 100644 (file)
@@ -27,6 +27,7 @@ nfp-objs := \
            nfp_port.o \
            bpf/main.o \
            bpf/offload.o \
+           flower/cmsg.o \
            nic/main.o
 
 ifeq ($(CONFIG_BPF_SYSCALL),y)
diff --git a/drivers/net/ethernet/netronome/nfp/flower/cmsg.c b/drivers/net/ethernet/netronome/nfp/flower/cmsg.c
new file mode 100644 (file)
index 0000000..7761be4
--- /dev/null
@@ -0,0 +1,159 @@
+/*
+ * Copyright (C) 2015-2017 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/bitfield.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <net/dst_metadata.h>
+
+#include "../nfpcore/nfp_cpp.h"
+#include "../nfp_net_repr.h"
+#include "./cmsg.h"
+
+#define nfp_flower_cmsg_warn(app, fmt, args...)                                \
+       do {                                                            \
+               if (net_ratelimit())                                    \
+                       nfp_warn((app)->cpp, fmt, ## args);             \
+       } while (0)
+
+static struct nfp_flower_cmsg_hdr *
+nfp_flower_cmsg_get_hdr(struct sk_buff *skb)
+{
+       return (struct nfp_flower_cmsg_hdr *)skb->data;
+}
+
+static void *nfp_flower_cmsg_get_data(struct sk_buff *skb)
+{
+       return (unsigned char *)skb->data + NFP_FLOWER_CMSG_HLEN;
+}
+
+static struct sk_buff *
+nfp_flower_cmsg_alloc(struct nfp_app *app, unsigned int size,
+                     enum nfp_flower_cmsg_type_port type)
+{
+       struct nfp_flower_cmsg_hdr *ch;
+       struct sk_buff *skb;
+
+       size += NFP_FLOWER_CMSG_HLEN;
+
+       skb = nfp_app_ctrl_msg_alloc(app, size, GFP_KERNEL);
+       if (!skb)
+               return NULL;
+
+       ch = nfp_flower_cmsg_get_hdr(skb);
+       ch->pad = 0;
+       ch->version = NFP_FLOWER_CMSG_VER1;
+       ch->type = type;
+       skb_put(skb, size);
+
+       return skb;
+}
+
+int nfp_flower_cmsg_portmod(struct net_device *netdev, bool carrier_ok)
+{
+       struct nfp_repr *repr = netdev_priv(netdev);
+       struct nfp_flower_cmsg_portmod *msg;
+       struct sk_buff *skb;
+
+       skb = nfp_flower_cmsg_alloc(repr->app, sizeof(*msg),
+                                   NFP_FLOWER_CMSG_TYPE_PORT_MOD);
+       if (!skb)
+               return -ENOMEM;
+
+       msg = nfp_flower_cmsg_get_data(skb);
+       msg->portnum = cpu_to_be32(repr->dst->u.port_info.port_id);
+       msg->reserved = 0;
+       msg->info = carrier_ok;
+       msg->mtu = cpu_to_be16(netdev->mtu);
+
+       nfp_ctrl_tx(repr->app->ctrl, skb);
+
+       return 0;
+}
+
+static void
+nfp_flower_cmsg_portmod_rx(struct nfp_app *app, struct sk_buff *skb)
+{
+       struct nfp_flower_cmsg_portmod *msg;
+       struct net_device *netdev;
+       bool link;
+
+       msg = nfp_flower_cmsg_get_data(skb);
+       link = msg->info & NFP_FLOWER_CMSG_PORTMOD_INFO_LINK;
+
+       rcu_read_lock();
+       netdev = nfp_app_repr_get(app, be32_to_cpu(msg->portnum));
+       if (!netdev) {
+               nfp_flower_cmsg_warn(app, "ctrl msg for unknown port 0x%08x\n",
+                                    be32_to_cpu(msg->portnum));
+               rcu_read_unlock();
+               return;
+       }
+
+       if (link) {
+               netif_carrier_on(netdev);
+               rtnl_lock();
+               dev_set_mtu(netdev, be16_to_cpu(msg->mtu));
+               rtnl_unlock();
+       } else {
+               netif_carrier_off(netdev);
+       }
+       rcu_read_unlock();
+}
+
+void nfp_flower_cmsg_rx(struct nfp_app *app, struct sk_buff *skb)
+{
+       struct nfp_flower_cmsg_hdr *cmsg_hdr;
+       enum nfp_flower_cmsg_type_port type;
+
+       cmsg_hdr = nfp_flower_cmsg_get_hdr(skb);
+
+       if (unlikely(cmsg_hdr->version != NFP_FLOWER_CMSG_VER1)) {
+               nfp_flower_cmsg_warn(app, "Cannot handle repr control version %u\n",
+                                    cmsg_hdr->version);
+               goto out;
+       }
+
+       type = cmsg_hdr->type;
+       switch (type) {
+       case NFP_FLOWER_CMSG_TYPE_PORT_MOD:
+               nfp_flower_cmsg_portmod_rx(app, skb);
+               break;
+       default:
+               nfp_flower_cmsg_warn(app, "Cannot handle invalid repr control type %u\n",
+                                    type);
+       }
+
+out:
+       dev_kfree_skb_any(skb);
+}
diff --git a/drivers/net/ethernet/netronome/nfp/flower/cmsg.h b/drivers/net/ethernet/netronome/nfp/flower/cmsg.h
new file mode 100644 (file)
index 0000000..2eeddad
--- /dev/null
@@ -0,0 +1,116 @@
+/*
+ * Copyright (C) 2017 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.
+ */
+
+#ifndef NFP_FLOWER_CMSG_H
+#define NFP_FLOWER_CMSG_H
+
+#include <linux/bitfield.h>
+#include <linux/skbuff.h>
+#include <linux/types.h>
+
+#include "../nfp_app.h"
+
+/* The base header for a control message packet.
+ * Defines an 8-bit version, and an 8-bit type, padded
+ * to a 32-bit word. Rest of the packet is type-specific.
+ */
+struct nfp_flower_cmsg_hdr {
+       __be16 pad;
+       u8 type;
+       u8 version;
+};
+
+#define NFP_FLOWER_CMSG_HLEN           sizeof(struct nfp_flower_cmsg_hdr)
+#define NFP_FLOWER_CMSG_VER1           1
+
+/* Types defined for port related control messages  */
+enum nfp_flower_cmsg_type_port {
+       NFP_FLOWER_CMSG_TYPE_PORT_MOD =         8,
+       NFP_FLOWER_CMSG_TYPE_PORT_ECHO =        16,
+       NFP_FLOWER_CMSG_TYPE_MAX =              32,
+};
+
+/* NFP_FLOWER_CMSG_TYPE_PORT_MOD */
+struct nfp_flower_cmsg_portmod {
+       __be32 portnum;
+       u8 reserved;
+       u8 info;
+       __be16 mtu;
+};
+
+#define NFP_FLOWER_CMSG_PORTMOD_INFO_LINK      BIT(0)
+
+enum nfp_flower_cmsg_port_type {
+       NFP_FLOWER_CMSG_PORT_TYPE_UNSPEC =      0x0,
+       NFP_FLOWER_CMSG_PORT_TYPE_PHYS_PORT =   0x1,
+       NFP_FLOWER_CMSG_PORT_TYPE_PCIE_PORT =   0x2,
+};
+
+enum nfp_flower_cmsg_port_vnic_type {
+       NFP_FLOWER_CMSG_PORT_VNIC_TYPE_VF =     0x0,
+       NFP_FLOWER_CMSG_PORT_VNIC_TYPE_PF =     0x1,
+       NFP_FLOWER_CMSG_PORT_VNIC_TYPE_CTRL =   0x2,
+};
+
+#define NFP_FLOWER_CMSG_PORT_TYPE              GENMASK(31, 28)
+#define NFP_FLOWER_CMSG_PORT_SYS_ID            GENMASK(27, 24)
+#define NFP_FLOWER_CMSG_PORT_NFP_ID            GENMASK(23, 22)
+#define NFP_FLOWER_CMSG_PORT_PCI               GENMASK(15, 14)
+#define NFP_FLOWER_CMSG_PORT_VNIC_TYPE         GENMASK(13, 12)
+#define NFP_FLOWER_CMSG_PORT_VNIC              GENMASK(11, 6)
+#define NFP_FLOWER_CMSG_PORT_PCIE_Q            GENMASK(5, 0)
+#define NFP_FLOWER_CMSG_PORT_PHYS_PORT_NUM     GENMASK(7, 0)
+
+static inline u32 nfp_flower_cmsg_phys_port(u8 phys_port)
+{
+       return FIELD_PREP(NFP_FLOWER_CMSG_PORT_PHYS_PORT_NUM, phys_port) |
+               FIELD_PREP(NFP_FLOWER_CMSG_PORT_TYPE,
+                          NFP_FLOWER_CMSG_PORT_TYPE_PHYS_PORT);
+}
+
+static inline u32
+nfp_flower_cmsg_pcie_port(u8 nfp_pcie, enum nfp_flower_cmsg_port_vnic_type type,
+                         u8 vnic, u8 q)
+{
+       return FIELD_PREP(NFP_FLOWER_CMSG_PORT_PCI, nfp_pcie) |
+               FIELD_PREP(NFP_FLOWER_CMSG_PORT_VNIC_TYPE, type) |
+               FIELD_PREP(NFP_FLOWER_CMSG_PORT_VNIC, vnic) |
+               FIELD_PREP(NFP_FLOWER_CMSG_PORT_PCIE_Q, q) |
+               FIELD_PREP(NFP_FLOWER_CMSG_PORT_TYPE,
+                          NFP_FLOWER_CMSG_PORT_TYPE_PCIE_PORT);
+}
+
+int nfp_flower_cmsg_portmod(struct net_device *netdev, bool carrier_ok);
+void nfp_flower_cmsg_rx(struct nfp_app *app, struct sk_buff *skb);
+
+#endif
index c9ccb0f..2b71050 100644 (file)
@@ -52,14 +52,15 @@ const char *nfp_app_mip_name(struct nfp_app *app)
        return nfp_mip_name(app->pf->mip);
 }
 
-struct sk_buff *nfp_app_ctrl_msg_alloc(struct nfp_app *app, unsigned int size)
+struct sk_buff *
+nfp_app_ctrl_msg_alloc(struct nfp_app *app, unsigned int size, gfp_t priority)
 {
        struct sk_buff *skb;
 
        if (nfp_app_ctrl_has_meta(app))
                size += 8;
 
-       skb = alloc_skb(size, GFP_ATOMIC);
+       skb = alloc_skb(size, priority);
        if (!skb)
                return NULL;
 
index ff2d436..36949b3 100644 (file)
@@ -268,7 +268,8 @@ nfp_app_reprs_set(struct nfp_app *app, enum nfp_repr_type type,
                  struct nfp_reprs *reprs);
 
 const char *nfp_app_mip_name(struct nfp_app *app);
-struct sk_buff *nfp_app_ctrl_msg_alloc(struct nfp_app *app, unsigned int size);
+struct sk_buff *
+nfp_app_ctrl_msg_alloc(struct nfp_app *app, unsigned int size, gfp_t priority);
 
 struct nfp_app *nfp_app_alloc(struct nfp_pf *pf, enum nfp_app_id id);
 void nfp_app_free(struct nfp_app *app);