xskumem.h

#ifndef XSKUMEM_XSKUMEM_H
#define XSKUMEM_XSKUMEM_H
 
#include "common/platform/sys/syscall.h"
 
/* Fixed-capacity UMEM frame allocator. Frames are identified by their
 * UMEM-relative offset (base_addr + i*XSKUMEM_FRAME_SIZE) rather than a
 * pointer, since that offset is exactly what the kernel's fill/completion
 * rings carry. A LIFO free list is enough: ownership only ever moves between
 * "free" and "in flight", never needs ordering. */

#define XSKUMEM_FRAME_SIZE 2048u

#define XSKUMEM_FRAMES 1024u

typedef struct {
  u64 free[XSKUMEM_FRAMES]; 
  u32 nfree;                
} xskumem_alloc;

void xskumem_alloc_init(xskumem_alloc* a, u64 base_addr, u32 nframes);

i64 xskumem_alloc_get(xskumem_alloc* a);

void xskumem_alloc_put(xskumem_alloc* a, u64 addr);
 
#endif