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MINOR: h3: adjust zero-copy sending related code

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Adjust HTTP/3 data emission. First, add HTX as argument to the function
as this is used for other frames emission function. Keep the buffer
argument as this is mandatory for zero-copy. Extend comments related to
this, in particular to explain purposes of both HTX and buffer
arguments.

No function change here. This should however be useful to port a code
equivalent to hq-interop protocol.
This commit is contained in:
Amaury Denoyelle 2023-12-08 15:48:06 +01:00
parent 0e632fc9b4
commit d3987b69c3
1 changed files with 29 additions and 17 deletions
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46
src/h3.c
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@ -1737,10 +1737,17 @@ static int h3_resp_trailers_send(struct qcs *qcs, struct htx *htx)
return 0;
}
/* Returns the total of bytes sent. */
static int h3_resp_data_send(struct qcs *qcs, struct buffer *buf, size_t count)
/* Convert a series of HTX data blocks from <htx> buffer of size <count> into
* HTTP/3 frames encoded into <qcs> Tx buffer. The caller must also specify the
* underlying HTX area via <buf> as this will be used if zero-copy can be
* performed.
*
* Returns the total bytes of encoded HTTP/3 payload. This corresponds to the
* total bytes of HTX block removed.
*/
static int h3_resp_data_send(struct qcs *qcs, struct htx *htx,
struct buffer *buf, size_t count)
{
struct htx *htx;
struct buffer outbuf;
struct buffer *res;
size_t total = 0;
@ -1750,8 +1757,6 @@ static int h3_resp_data_send(struct qcs *qcs, struct buffer *buf, size_t count)
TRACE_ENTER(H3_EV_TX_FRAME|H3_EV_TX_DATA, qcs->qcc->conn, qcs);
htx = htx_from_buf(buf);
new_frame:
if (!count || htx_is_empty(htx))
goto end;
@ -1770,27 +1775,32 @@ static int h3_resp_data_send(struct qcs *qcs, struct buffer *buf, size_t count)
/* TODO */
}
/* If HTX contains only one DATA block, try to exchange it with MUX
* buffer to perform zero-copy. This is only achievable if MUX buffer
* is currently empty.
*/
if (unlikely(fsize == count &&
!b_data(res) &&
htx_nbblks(htx) == 1 && type == HTX_BLK_DATA)) {
!b_data(res) &&
htx_nbblks(htx) == 1 && type == HTX_BLK_DATA)) {
void *old_area = res->area;
TRACE_DATA("perform zero-copy DATA transfer",
H3_EV_TX_FRAME|H3_EV_TX_DATA, qcs->qcc->conn, qcs);
/* map an H2 frame to the HTX block so that we can put the
* frame header there.
*/
*res = b_make(buf->area, buf->size, sizeof(struct htx) + blk->addr - hsize, fsize + hsize);
outbuf = b_make(b_head(res), hsize, 0, 0);
b_putchr(&outbuf, 0x00); /* h3 frame type = DATA */
b_quic_enc_int(&outbuf, fsize, QUIC_VARINT_MAX_SIZE); /* h3 frame length */
/* remap MUX buffer to HTX area, keep an offset for H3 header. */
*res = b_make(buf->area, buf->size,
sizeof(struct htx) + blk->addr - hsize, 0);
/* and exchange with our old area */
/* write H3 header frame before old HTX block. */
b_putchr(res, 0x00); /* h3 frame type = DATA */
b_quic_enc_int(res, fsize, QUIC_VARINT_MAX_SIZE); /* h3 frame length */
b_add(res, fsize);
/* assign old MUX area to HTX buffer. */
buf->area = old_area;
buf->data = buf->head = 0;
total += fsize;
fsize = 0;
goto end;
}
@ -1877,9 +1887,11 @@ static size_t h3_snd_buf(struct qcs *qcs, struct buffer *buf, size_t count)
break;
case HTX_BLK_DATA:
ret = h3_resp_data_send(qcs, buf, count);
ret = h3_resp_data_send(qcs, htx, buf, count);
if (ret > 0) {
/* Reload HTX. This is necessary if 0-copy was performed. */
htx = htx_from_buf(buf);
total += ret;
count -= ret;
if (ret < bsize)