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/*
* Copyright (c) 2022 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <http/http_buffer.h>
#include <http/http.h>
static http_buffer_vft_t buf_vfts[HTTP_BUFFER_PTR + 1];
#define HTTP_BUFFER_REGISTER_VFT(type, vft) \
static void __attribute__ ((constructor)) http_buf_init_##type (void) \
{ \
buf_vfts[type] = vft; \
}
typedef struct http_buffer_fifo_
{
svm_fifo_t *src;
svm_fifo_seg_t *segs;
u64 len;
u64 offset;
} http_buffer_fifo_t;
STATIC_ASSERT (sizeof (http_buffer_fifo_t) <= HTTP_BUFFER_DATA_SZ, "buf data");
static void
buf_fifo_init (http_buffer_t *hb, void *data, u64 len)
{
svm_fifo_t *f = (svm_fifo_t *) data;
http_buffer_fifo_t *bf;
bf = (http_buffer_fifo_t *) &hb->data;
bf->len = len;
bf->offset = 0;
bf->src = f;
bf->segs = 0;
}
static void
buf_fifo_free (http_buffer_t *hb)
{
http_buffer_fifo_t *bf = (http_buffer_fifo_t *) &hb->data;
bf->src = 0;
vec_free (bf->segs);
}
static svm_fifo_seg_t *
buf_fifo_get_segs (http_buffer_t *hb, u32 max_len, u32 *n_segs)
{
http_buffer_fifo_t *bf = (http_buffer_fifo_t *) &hb->data;
u32 _n_segs = 5;
int len;
max_len = clib_min (bf->len - bf->offset, (u64) max_len);
vec_validate (bf->segs, _n_segs);
len = svm_fifo_segments (bf->src, 0, bf->segs, &_n_segs, max_len);
if (len < 0)
return 0;
*n_segs = _n_segs;
HTTP_DBG (1, "available to send %u n_segs %u", len, *n_segs);
return bf->segs;
}
static u32
buf_fifo_drain (http_buffer_t *hb, u32 len)
{
http_buffer_fifo_t *bf = (http_buffer_fifo_t *) &hb->data;
bf->offset += len;
svm_fifo_dequeue_drop (bf->src, len);
HTTP_DBG (1, "drained %u len %u offset %u", len, bf->len, bf->offset);
return len;
}
static u8
buf_fifo_is_drained (http_buffer_t *hb)
{
http_buffer_fifo_t *bf = (http_buffer_fifo_t *) &hb->data;
ASSERT (bf->offset <= bf->len);
return (bf->offset == bf->len);
}
const static http_buffer_vft_t buf_fifo_vft = {
.init = buf_fifo_init,
.free = buf_fifo_free,
.get_segs = buf_fifo_get_segs,
.drain = buf_fifo_drain,
.is_drained = buf_fifo_is_drained,
};
HTTP_BUFFER_REGISTER_VFT (HTTP_BUFFER_FIFO, buf_fifo_vft);
typedef struct http_buffer_ptr_
{
svm_fifo_seg_t *segs;
svm_fifo_t *f;
} http_buffer_ptr_t;
STATIC_ASSERT (sizeof (http_buffer_ptr_t) <= HTTP_BUFFER_DATA_SZ, "buf data");
static void
buf_ptr_init (http_buffer_t *hb, void *data, u64 len)
{
svm_fifo_t *f = (svm_fifo_t *) data;
http_buffer_ptr_t *bf;
uword ptr;
int rv;
bf = (http_buffer_ptr_t *) &hb->data;
/* Peek the pointer, do not drain the fifo until done with transfer */
rv = svm_fifo_peek (f, 0, sizeof (ptr), (u8 *) &ptr);
ASSERT (rv == sizeof (ptr));
bf->f = f;
bf->segs = 0;
vec_validate (bf->segs, 1);
bf->segs[0].data = uword_to_pointer (ptr, u8 *);
bf->segs[0].len = len;
bf->segs[1] = bf->segs[0];
}
static void
buf_ptr_free (http_buffer_t *hb)
{
http_buffer_ptr_t *bf = (http_buffer_ptr_t *) &hb->data;
bf->f = 0;
vec_free (bf->segs);
}
static svm_fifo_seg_t *
buf_ptr_get_segs (http_buffer_t *hb, u32 max_len, u32 *n_segs)
{
http_buffer_ptr_t *bf = (http_buffer_ptr_t *) &hb->data;
*n_segs = 1;
bf->segs[1].len = clib_min (bf->segs[0].len, max_len);
return &bf->segs[1];
}
static u32
buf_ptr_drain (http_buffer_t *hb, u32 len)
{
http_buffer_ptr_t *bf = (http_buffer_ptr_t *) &hb->data;
ASSERT (bf->segs[0].len >= len);
bf->segs[1].data += len;
bf->segs[0].len -= len;
HTTP_DBG (1, "drained %u left %u", len, bf->segs[1].len);
if (!bf->segs[0].len)
{
svm_fifo_dequeue_drop (bf->f, sizeof (uword));
return sizeof (uword);
}
return 0;
}
static u8
buf_ptr_is_drained (http_buffer_t *hb)
{
http_buffer_ptr_t *bf = (http_buffer_ptr_t *) &hb->data;
return (bf->segs[0].len == 0);
}
const static http_buffer_vft_t buf_ptr_vft = {
.init = buf_ptr_init,
.free = buf_ptr_free,
.get_segs = buf_ptr_get_segs,
.drain = buf_ptr_drain,
.is_drained = buf_ptr_is_drained,
};
HTTP_BUFFER_REGISTER_VFT (HTTP_BUFFER_PTR, buf_ptr_vft);
void
http_buffer_init (http_buffer_t *hb, http_buffer_type_t type, svm_fifo_t *f,
u64 data_len)
{
hb->vft = &buf_vfts[type];
hb->vft->init (hb, f, data_len);
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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