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-rw-r--r--src/plugins/http/http_buffer.c217
1 files changed, 217 insertions, 0 deletions
diff --git a/src/plugins/http/http_buffer.c b/src/plugins/http/http_buffer.c
new file mode 100644
index 00000000000..5b4f5fc0300
--- /dev/null
+++ b/src/plugins/http/http_buffer.c
@@ -0,0 +1,217 @@
+/*
+ * 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;
+ u32 len;
+ u32 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, u32 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_max (bf->len - bf->offset, 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 int
+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, u32 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;
+
+ return &bf->segs[1];
+}
+
+static int
+buf_ptr_drain (http_buffer_t *hb, u32 len)
+{
+ http_buffer_ptr_t *bf = (http_buffer_ptr_t *) &hb->data;
+
+ bf->segs[1].data += len;
+ bf->segs[1].len -= len;
+
+ HTTP_DBG (1, "drained %u left %u", len, bf->segs[1].len);
+
+ if (!bf->segs[1].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;
+
+ ASSERT (bf->segs[1].len <= bf->segs[0].len);
+ return (bf->segs[1].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,
+ u32 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:
+ */