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further simplify & fix calculations

This commit is contained in:
pooka 2010-08-12 18:39:54 +00:00
parent 6461f6dd05
commit 38800eaa1c
1 changed files with 11 additions and 10 deletions
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21
sys/rump/net/lib/libshmif/if_shmem.c
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@ -1,4 +1,4 @@
/* $NetBSD: if_shmem.c,v 1.17 2010/08/12 18:17:23 pooka Exp $ */
/* $NetBSD: if_shmem.c,v 1.18 2010/08/12 18:39:54 pooka Exp $ */
/*
* Copyright (c) 2009 Antti Kantee. All Rights Reserved.
@ -28,7 +28,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_shmem.c,v 1.17 2010/08/12 18:17:23 pooka Exp $");
__KERNEL_RCSID(0, "$NetBSD: if_shmem.c,v 1.18 2010/08/12 18:39:54 pooka Exp $");
#include <sys/param.h>
#include <sys/atomic.h>
@ -79,7 +79,8 @@ struct shmif_sc {
uint32_t sc_prevgen;
};
#define BUSMEM_SIZE (1024*1024) /* need write throttling? */
#define BUSMEM_SIZE (1024*1024)
#define BUSMEM_DATASIZE (BUSMEM_SIZE - sizeof(struct shmif_mem))
static const uint32_t busversion = SHMIF_VERSION;
@ -120,8 +121,8 @@ busread(struct shmif_sc *sc, void *dest, uint32_t off, size_t len)
{
size_t chunk;
KASSERT(len < (BUSMEM_SIZE - IFMEM_DATA) && off <= BUSMEM_SIZE);
chunk = MIN(len, BUSMEM_SIZE - off);
KASSERT(len < (BUSMEM_DATASIZE) && off <= BUSMEM_DATASIZE);
chunk = MIN(len, BUSMEM_DATASIZE - off);
memcpy(dest, sc->sc_busmem->shm_data + off, chunk);
len -= chunk;
@ -142,9 +143,9 @@ buswrite(struct shmif_sc *sc, uint32_t off, void *data, size_t len)
{
size_t chunk;
KASSERT(len < (BUSMEM_SIZE - IFMEM_DATA) && off <= BUSMEM_SIZE);
KASSERT(len < (BUSMEM_DATASIZE) && off <= BUSMEM_DATASIZE);
chunk = MIN(len, BUSMEM_SIZE - off);
chunk = MIN(len, BUSMEM_DATASIZE - off);
memcpy(sc->sc_busmem->shm_data + off, data, chunk);
len -= chunk;
@ -170,8 +171,8 @@ advance(uint32_t oldoff, uint32_t delta)
uint32_t newoff;
newoff = oldoff + delta;
if (newoff >= BUSMEM_SIZE)
newoff -= (BUSMEM_SIZE - IFMEM_DATA);
if (newoff >= BUSMEM_DATASIZE)
newoff -= (BUSMEM_DATASIZE);
return newoff;
}
@ -182,7 +183,7 @@ nextpktoff(struct shmif_sc *sc, uint32_t oldoff)
uint32_t oldlen;
busread(sc, &oldlen, oldoff, PKTLEN_SIZE);
KASSERT(oldlen < BUSMEM_SIZE - IFMEM_DATA);
KASSERT(oldlen < BUSMEM_DATASIZE);
return advance(oldoff, PKTLEN_SIZE + oldlen);
}