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Commit 67f29e07 authored by Jesper Dangaard Brouer's avatar Jesper Dangaard Brouer Committed by Alexei Starovoitov
Browse files

bpf: devmap introduce dev_map_enqueue 



Functionality is the same, but the ndo_xdp_xmit call is now
simply invoked from inside the devmap.c code.

V2: Fix compile issue reported by kbuild test robot <lkp@intel.com>

V5: Cleanups requested by Daniel
 - Newlines before func definition
 - Use BUILD_BUG_ON checks
 - Remove unnecessary use return value store in dev_map_enqueue

Signed-off-by: default avatarJesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent f80acbd2

include/linux/bpf.h

+13 −3
Original line number Diff line number Diff line
@@ -487,14 +487,16 @@ int bpf_check(struct bpf_prog **fp, union bpf_attr *attr); 
void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);



/* Map specifics */

struct net_device  *__dev_map_lookup_elem(struct bpf_map *map, u32 key);

struct xdp_buff;



struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key);

void __dev_map_insert_ctx(struct bpf_map *map, u32 index);

void __dev_map_flush(struct bpf_map *map);

int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp);



struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key);

void __cpu_map_insert_ctx(struct bpf_map *map, u32 index);

void __cpu_map_flush(struct bpf_map *map);

struct xdp_buff;

int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,

		    struct net_device *dev_rx);
@@ -573,6 +575,15 @@ static inline void __dev_map_flush(struct bpf_map *map) 
{

}



struct xdp_buff;

struct bpf_dtab_netdev;



static inline

int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp)

{

	return 0;

}



static inline

struct bpf_cpu_map_entry *__cpu_map_lookup_elem(struct bpf_map *map, u32 key)

{
@@ -587,7 +598,6 @@ static inline void __cpu_map_flush(struct bpf_map *map) 
{

}



struct xdp_buff;

static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,

				  struct xdp_buff *xdp,

				  struct net_device *dev_rx)

include/trace/events/xdp.h

+8 −1
Original line number Diff line number Diff line
@@ -138,11 +138,18 @@ DEFINE_EVENT_PRINT(xdp_redirect_template, xdp_redirect_map_err, 
		  __entry->map_id, __entry->map_index)

);



#ifndef __DEVMAP_OBJ_TYPE

#define __DEVMAP_OBJ_TYPE

struct _bpf_dtab_netdev {

	struct net_device *dev;

};

#endif /* __DEVMAP_OBJ_TYPE */



#define devmap_ifindex(fwd, map)				\

	(!fwd ? 0 :						\

	 (!map ? 0 :						\

	  ((map->map_type == BPF_MAP_TYPE_DEVMAP) ?		\

	   ((struct net_device *)fwd)->ifindex : 0)))

	   ((struct _bpf_dtab_netdev *)fwd)->dev->ifindex : 0)))



#define _trace_xdp_redirect_map(dev, xdp, fwd, map, idx)		\

	 trace_xdp_redirect_map(dev, xdp, devmap_ifindex(fwd, map),	\

kernel/bpf/devmap.c

+28 −6
Original line number Diff line number Diff line
@@ -48,13 +48,15 @@ 
 * calls will fail at this point.

 */

#include <linux/bpf.h>

#include <net/xdp.h>

#include <linux/filter.h>

#include <trace/events/xdp.h>



#define DEV_CREATE_FLAG_MASK \

	(BPF_F_NUMA_NODE | BPF_F_RDONLY | BPF_F_WRONLY)



struct bpf_dtab_netdev {

	struct net_device *dev;

	struct net_device *dev; /* must be first member, due to tracepoint */

	struct bpf_dtab *dtab;

	unsigned int bit;

	struct rcu_head rcu;
@@ -240,21 +242,38 @@ void __dev_map_flush(struct bpf_map *map) 
 * update happens in parallel here a dev_put wont happen until after reading the

 * ifindex.

 */

struct net_device  *__dev_map_lookup_elem(struct bpf_map *map, u32 key)

struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key)

{

	struct bpf_dtab *dtab = container_of(map, struct bpf_dtab, map);

	struct bpf_dtab_netdev *dev;

	struct bpf_dtab_netdev *obj;



	if (key >= map->max_entries)

		return NULL;



	dev = READ_ONCE(dtab->netdev_map[key]);

	return dev ? dev->dev : NULL;

	obj = READ_ONCE(dtab->netdev_map[key]);

	return obj;

}



int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp)

{

	struct net_device *dev = dst->dev;

	struct xdp_frame *xdpf;



	if (!dev->netdev_ops->ndo_xdp_xmit)

		return -EOPNOTSUPP;



	xdpf = convert_to_xdp_frame(xdp);

	if (unlikely(!xdpf))

		return -EOVERFLOW;



	/* TODO: implement a bulking/enqueue step later */

	return dev->netdev_ops->ndo_xdp_xmit(dev, xdpf);

}



static void *dev_map_lookup_elem(struct bpf_map *map, void *key)

{

	struct net_device *dev = __dev_map_lookup_elem(map, *(u32 *)key);

	struct bpf_dtab_netdev *obj = __dev_map_lookup_elem(map, *(u32 *)key);

	struct net_device *dev = dev = obj ? obj->dev : NULL;



	return dev ? &dev->ifindex : NULL;

}
@@ -405,6 +424,9 @@ static struct notifier_block dev_map_notifier = { 


static int __init dev_map_init(void)

{

	/* Assure tracepoint shadow struct _bpf_dtab_netdev is in sync */

	BUILD_BUG_ON(offsetof(struct bpf_dtab_netdev, dev) !=

		     offsetof(struct _bpf_dtab_netdev, dev));

	register_netdevice_notifier(&dev_map_notifier);

	return 0;

}

net/core/filter.c

+2 −13
Original line number Diff line number Diff line
@@ -3065,20 +3065,9 @@ static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd, 


	switch (map->map_type) {

	case BPF_MAP_TYPE_DEVMAP: {

		struct net_device *dev = fwd;

		struct xdp_frame *xdpf;



		if (!dev->netdev_ops->ndo_xdp_xmit)

			return -EOPNOTSUPP;

		struct bpf_dtab_netdev *dst = fwd;



		xdpf = convert_to_xdp_frame(xdp);

		if (unlikely(!xdpf))

			return -EOVERFLOW;



		/* TODO: move to inside map code instead, for bulk support

		 * err = dev_map_enqueue(dev, xdp);

		 */

		err = dev->netdev_ops->ndo_xdp_xmit(dev, xdpf);

		err = dev_map_enqueue(dst, xdp);

		if (err)

			return err;

		__dev_map_insert_ctx(map, index);