vnet_rewrite_declare(64 - 2*sizeof(int)) rw;
} my_adjacency_t;
*/
-#define vnet_declare_rewrite(total_bytes) \
-struct { \
- vnet_rewrite_header_t rewrite_header; \
- \
- u8 rewrite_data[(total_bytes) - sizeof (vnet_rewrite_header_t)]; \
-}
+#define VNET_DECLARE_REWRITE \
+ struct \
+ { \
+ vnet_rewrite_header_t rewrite_header; \
+ \
+ u8 rewrite_data[(VNET_REWRITE_TOTAL_BYTES) - \
+ sizeof (vnet_rewrite_header_t)]; \
+ }
always_inline void
vnet_rewrite_clear_data_internal (vnet_rewrite_header_t * rw, int max_size)
ASSERT ((data_bytes >= 0) && (data_bytes < max_size));
rw->data_bytes = data_bytes;
- clib_memcpy_fast (rw->data + max_size - data_bytes, data, data_bytes);
- clib_memset (rw->data, 0xfe, max_size - data_bytes);
+ clib_memcpy_fast (rw->data, data, data_bytes);
+ clib_memset (rw->data + data_bytes, 0xfe, max_size - data_bytes);
}
#define vnet_rewrite_set_data(rw,data,data_bytes) \
vnet_rewrite_get_data_internal (vnet_rewrite_header_t * rw, int max_size)
{
ASSERT (rw->data_bytes <= max_size);
- return rw->data + max_size - rw->data_bytes;
+ return rw->data;
}
#define vnet_rewrite_get_data(rw) \
vnet_rewrite_get_data_internal (&((rw).rewrite_header), sizeof ((rw).rewrite_data))
always_inline void
-vnet_rewrite_copy_one (vnet_rewrite_data_t * p0, vnet_rewrite_data_t * rw0,
- int i)
-{
- p0[-i] = rw0[-i];
-}
-
-void vnet_rewrite_copy_slow_path (vnet_rewrite_data_t * p0,
- vnet_rewrite_data_t * rw0,
- word n_left, uword most_likely_size);
-
-/* *INDENT-OFF* */
-typedef CLIB_PACKED (struct {
- u64 a;
- u32 b;
- u16 c;
-}) eh_copy_t;
-/* *INDENT-ON* */
-
-always_inline void
-_vnet_rewrite_one_header (vnet_rewrite_header_t * h0,
- void *packet0, int max_size, int most_likely_size)
+_vnet_rewrite_one_header (const vnet_rewrite_header_t * h0,
+ void *packet0, int most_likely_size)
{
- vnet_rewrite_data_t *p0 = packet0;
- vnet_rewrite_data_t *rw0 = (vnet_rewrite_data_t *) (h0->data + max_size);
- word n_left0;
-
/* 0xfefe => poisoned adjacency => crash */
ASSERT (h0->data_bytes != 0xfefe);
-
- if (PREDICT_TRUE (h0->data_bytes == sizeof (eh_copy_t)))
+ if (PREDICT_TRUE (most_likely_size == h0->data_bytes))
{
- eh_copy_t *s, *d;
- s = (eh_copy_t *) (h0->data + max_size - sizeof (eh_copy_t));
- d = (eh_copy_t *) (((u8 *) packet0) - sizeof (eh_copy_t));
- clib_memcpy (d, s, sizeof (eh_copy_t));
- return;
+ clib_memcpy_fast ((u8 *) packet0 - most_likely_size,
+ h0->data, most_likely_size);
+ }
+ else
+ {
+ clib_memcpy_fast ((u8 *) packet0 - h0->data_bytes,
+ h0->data, h0->data_bytes);
}
- /*
- * Stop now if the data_bytes field is zero, to avoid the cache
- * miss consequences of spraying [functionally harmless] junk into
- * un-prefetched rewrite space.
- */
- if (PREDICT_FALSE (h0->data_bytes == 0))
- return;
-
-#define _(i) \
- do { \
- if (most_likely_size > ((i)-1)*sizeof (vnet_rewrite_data_t)) \
- vnet_rewrite_copy_one (p0, rw0, (i)); \
- } while (0)
-
- _(4);
- _(3);
- _(2);
- _(1);
-
-#undef _
-
- n_left0 = (int)
- (((int) h0->data_bytes - most_likely_size) + (sizeof (rw0[0]) - 1))
- / (int) sizeof (rw0[0]);
- if (PREDICT_FALSE (n_left0 > 0))
- vnet_rewrite_copy_slow_path (p0, rw0, n_left0, most_likely_size);
}
always_inline void
-_vnet_rewrite_two_headers (vnet_rewrite_header_t * h0,
- vnet_rewrite_header_t * h1,
- void *packet0,
- void *packet1, int max_size, int most_likely_size)
+_vnet_rewrite_two_headers (const vnet_rewrite_header_t * h0,
+ const vnet_rewrite_header_t * h1,
+ void *packet0, void *packet1, int most_likely_size)
{
- vnet_rewrite_data_t *p0 = packet0;
- vnet_rewrite_data_t *p1 = packet1;
- vnet_rewrite_data_t *rw0 = (vnet_rewrite_data_t *) (h0->data + max_size);
- vnet_rewrite_data_t *rw1 = (vnet_rewrite_data_t *) (h1->data + max_size);
- word n_left0, n_left1;
- int slow_path;
-
/* 0xfefe => poisoned adjacency => crash */
ASSERT (h0->data_bytes != 0xfefe);
ASSERT (h1->data_bytes != 0xfefe);
-
- /* Arithmetic calculation: bytes0 == bytes1 == 14 */
- slow_path = h0->data_bytes ^ h1->data_bytes;
- slow_path += h0->data_bytes ^ sizeof (eh_copy_t);
-
- if (PREDICT_TRUE (slow_path == 0))
+ if (PREDICT_TRUE
+ (most_likely_size == h0->data_bytes
+ && most_likely_size == h1->data_bytes))
{
- eh_copy_t *s0, *d0, *s1, *d1;
- s0 = (eh_copy_t *) (h0->data + max_size - sizeof (eh_copy_t));
- d0 = (eh_copy_t *) (((u8 *) packet0) - sizeof (eh_copy_t));
- clib_memcpy (d0, s0, sizeof (eh_copy_t));
- s1 = (eh_copy_t *) (h1->data + max_size - sizeof (eh_copy_t));
- d1 = (eh_copy_t *) (((u8 *) packet1) - sizeof (eh_copy_t));
- clib_memcpy (d1, s1, sizeof (eh_copy_t));
- return;
+ clib_memcpy_fast ((u8 *) packet0 - most_likely_size,
+ h0->data, most_likely_size);
+ clib_memcpy_fast ((u8 *) packet1 - most_likely_size,
+ h1->data, most_likely_size);
}
-
- /*
- * Stop now if both rewrite data_bytes fields are zero, to avoid the cache
- * miss consequences of spraying [functionally harmless] junk into
- * un-prefetched rewrite space.
- */
- if (PREDICT_FALSE (h0->data_bytes + h1->data_bytes == 0))
- return;
-
-#define _(i) \
- do { \
- if (most_likely_size > ((i)-1)*sizeof (vnet_rewrite_data_t)) \
- { \
- vnet_rewrite_copy_one (p0, rw0, (i)); \
- vnet_rewrite_copy_one (p1, rw1, (i)); \
- } \
- } while (0)
-
- _(4);
- _(3);
- _(2);
- _(1);
-
-#undef _
-
- n_left0 = (int)
- (((int) h0->data_bytes - most_likely_size) + (sizeof (rw0[0]) - 1))
- / (int) sizeof (rw0[0]);
- n_left1 = (int)
- (((int) h1->data_bytes - most_likely_size) + (sizeof (rw1[0]) - 1))
- / (int) sizeof (rw1[0]);
-
- if (PREDICT_FALSE (n_left0 > 0 || n_left1 > 0))
+ else
{
- vnet_rewrite_copy_slow_path (p0, rw0, n_left0, most_likely_size);
- vnet_rewrite_copy_slow_path (p1, rw1, n_left1, most_likely_size);
+ clib_memcpy_fast ((u8 *) packet0 - h0->data_bytes,
+ h0->data, h0->data_bytes);
+ clib_memcpy_fast ((u8 *) packet1 - h1->data_bytes,
+ h1->data, h1->data_bytes);
}
}
#define vnet_rewrite_one_header(rw0,p0,most_likely_size) \
_vnet_rewrite_one_header (&((rw0).rewrite_header), (p0), \
- sizeof ((rw0).rewrite_data), \
(most_likely_size))
#define vnet_rewrite_two_headers(rw0,rw1,p0,p1,most_likely_size) \
_vnet_rewrite_two_headers (&((rw0).rewrite_header), &((rw1).rewrite_header), \
(p0), (p1), \
- sizeof ((rw0).rewrite_data), \
(most_likely_size))
always_inline void
Code Review / vpp.git / blobdiff