Implement the APIs:
- odp_packet_ref_static()
- odp_packet_ref()
- odp_packet_ref_pkt()
- odp_packet_is_ref()
- odp_packet_has_ref()
- odp_packet_unshared_len()
This also involves functional upgrades to the existing packet manipulation
APIs to work with packet references as input.
Signed-off-by: Bill Fischofer <bill.fischo...@linaro.org>
---
.../linux-generic/include/odp_packet_internal.h | 68 ++-
platform/linux-generic/odp_packet.c | 484 +++++++++++++++++----
2 files changed, 458 insertions(+), 94 deletions(-)
diff --git a/platform/linux-generic/include/odp_packet_internal.h
b/platform/linux-generic/include/odp_packet_internal.h
index d09231e..74568cf 100644
--- a/platform/linux-generic/include/odp_packet_internal.h
+++ b/platform/linux-generic/include/odp_packet_internal.h
@@ -167,7 +167,7 @@ typedef struct {
* packet_init(). Because of this any new fields added must be reviewed for
* initialization requirements.
*/
-typedef struct {
+typedef struct odp_packet_hdr_t {
/* common buffer header */
odp_buffer_hdr_t buf_hdr;
@@ -178,6 +178,13 @@ typedef struct {
uint32_t headroom;
uint32_t tailroom;
+ /* Fields used to support packet references */
+ odp_atomic_u32_t ref_count; /* Number of refs to this pkt/seg */
+ uint32_t unshared_len; /* Offset that sharing starts at */
+ uint32_t ref_offset; /* Offset into base pkt for this ref */
+ uint32_t ref_len; /* frame_len at time this ref created */
+ struct odp_packet_hdr_t *ref_hdr; /* Ptr to the base pkt for this ref */
+
odp_pktio_t input;
/* Members below are not initialized by packet_init() */
@@ -200,6 +207,50 @@ static inline odp_packet_hdr_t
*odp_packet_hdr(odp_packet_t pkt)
return (odp_packet_hdr_t *)buf_hdl_to_hdr((odp_buffer_t)pkt);
}
+static inline odp_packet_hdr_t *odp_packet_last_hdr(odp_packet_t pkt,
+ uint32_t *offset)
+{
+ odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(pkt);
+ odp_packet_hdr_t *prev_hdr = pkt_hdr;
+ uint32_t ref_offset = 0;
+
+ while (pkt_hdr->ref_hdr) {
+ ref_offset = pkt_hdr->ref_offset;
+ prev_hdr = pkt_hdr;
+ pkt_hdr = pkt_hdr->ref_hdr;
+ }
+
+ if (offset) {
+ if (prev_hdr != pkt_hdr)
+ ref_offset += pkt_hdr->frame_len - prev_hdr->ref_len;
+ *offset = ref_offset;
+ }
+
+ return pkt_hdr;
+}
+
+static inline odp_packet_hdr_t *odp_packet_prev_hdr(odp_packet_hdr_t *pkt_hdr,
+ odp_packet_hdr_t *cur_hdr,
+ uint32_t *offset)
+{
+ uint32_t ref_offset = 0;
+ odp_packet_hdr_t *prev_hdr = pkt_hdr;
+
+ while (pkt_hdr->ref_hdr != cur_hdr) {
+ ref_offset = pkt_hdr->ref_offset;
+ prev_hdr = pkt_hdr;
+ pkt_hdr = pkt_hdr->ref_hdr;
+ }
+
+ if (offset) {
+ if (prev_hdr != pkt_hdr)
+ ref_offset += pkt_hdr->frame_len - prev_hdr->ref_len;
+ *offset = ref_offset;
+ }
+
+ return pkt_hdr;
+}
+
static inline void copy_packet_parser_metadata(odp_packet_hdr_t *src_hdr,
odp_packet_hdr_t *dst_hdr)
{
@@ -222,12 +273,25 @@ static inline void pull_tail(odp_packet_hdr_t *pkt_hdr,
uint32_t len)
pkt_hdr->tailroom += len;
pkt_hdr->frame_len -= len;
+ pkt_hdr->unshared_len -= len;
pkt_hdr->buf_hdr.seg[last].len -= len;
}
static inline uint32_t packet_len(odp_packet_hdr_t *pkt_hdr)
{
- return pkt_hdr->frame_len;
+ uint32_t pkt_len = 0;
+ uint32_t offset = 0;
+
+ do {
+ pkt_len += pkt_hdr->frame_len - offset;
+ offset = pkt_hdr->ref_offset;
+ if (pkt_hdr->ref_hdr)
+ offset += (pkt_hdr->ref_hdr->frame_len -
+ pkt_hdr->ref_len);
+ pkt_hdr = pkt_hdr->ref_hdr;
+ } while (pkt_hdr);
+
+ return pkt_len;
}
static inline void packet_set_len(odp_packet_hdr_t *pkt_hdr, uint32_t len)
diff --git a/platform/linux-generic/odp_packet.c
b/platform/linux-generic/odp_packet.c
index 58b6f32..433511c 100644
--- a/platform/linux-generic/odp_packet.c
+++ b/platform/linux-generic/odp_packet.c
@@ -30,13 +30,34 @@ static inline odp_buffer_t buffer_handle(odp_packet_hdr_t
*pkt_hdr)
return pkt_hdr->buf_hdr.handle.handle;
}
+static inline uint32_t packet_ref_count(odp_packet_hdr_t *pkt_hdr)
+{
+ return odp_atomic_load_u32(&pkt_hdr->ref_count);
+}
+
+static inline void packet_ref_count_set(odp_packet_hdr_t *pkt_hdr, uint32_t n)
+{
+ odp_atomic_init_u32(&pkt_hdr->ref_count, n);
+}
+
+static inline uint32_t packet_ref_inc(odp_packet_hdr_t *pkt_hdr)
+{
+ return odp_atomic_fetch_inc_u32(&pkt_hdr->ref_count);
+}
+
+static inline uint32_t packet_ref_dec(odp_packet_hdr_t *pkt_hdr)
+{
+ return odp_atomic_fetch_dec_u32(&pkt_hdr->ref_count);
+}
+
static inline uint32_t packet_seg_len(odp_packet_hdr_t *pkt_hdr,
uint32_t seg_idx)
{
return pkt_hdr->buf_hdr.seg[seg_idx].len;
}
-static inline void *packet_seg_data(odp_packet_hdr_t *pkt_hdr, uint32_t
seg_idx)
+static inline uint8_t *packet_seg_data(odp_packet_hdr_t *pkt_hdr,
+ uint32_t seg_idx)
{
return pkt_hdr->buf_hdr.seg[seg_idx].data;
}
@@ -49,6 +70,11 @@ static inline int packet_last_seg(odp_packet_hdr_t *pkt_hdr)
return pkt_hdr->buf_hdr.segcount - 1;
}
+static inline void *packet_data(odp_packet_hdr_t *pkt_hdr)
+{
+ return pkt_hdr->buf_hdr.seg[0].data;
+}
+
static inline uint32_t packet_first_seg_len(odp_packet_hdr_t *pkt_hdr)
{
return packet_seg_len(pkt_hdr, 0);
@@ -61,11 +87,6 @@ static inline uint32_t packet_last_seg_len(odp_packet_hdr_t
*pkt_hdr)
return packet_seg_len(pkt_hdr, last);
}
-static inline void *packet_data(odp_packet_hdr_t *pkt_hdr)
-{
- return pkt_hdr->buf_hdr.seg[0].data;
-}
-
static inline void *packet_tail(odp_packet_hdr_t *pkt_hdr)
{
int last = packet_last_seg(pkt_hdr);
@@ -96,6 +117,7 @@ static inline void push_head(odp_packet_hdr_t *pkt_hdr,
uint32_t len)
{
pkt_hdr->headroom -= len;
pkt_hdr->frame_len += len;
+ pkt_hdr->unshared_len += len;
pkt_hdr->buf_hdr.seg[0].data -= len;
pkt_hdr->buf_hdr.seg[0].len += len;
}
@@ -104,6 +126,7 @@ static inline void pull_head(odp_packet_hdr_t *pkt_hdr,
uint32_t len)
{
pkt_hdr->headroom += len;
pkt_hdr->frame_len -= len;
+ pkt_hdr->unshared_len -= len;
pkt_hdr->buf_hdr.seg[0].data += len;
pkt_hdr->buf_hdr.seg[0].len -= len;
}
@@ -114,6 +137,7 @@ static inline void push_tail(odp_packet_hdr_t *pkt_hdr,
uint32_t len)
pkt_hdr->tailroom -= len;
pkt_hdr->frame_len += len;
+ pkt_hdr->unshared_len += len;
pkt_hdr->buf_hdr.seg[last].len += len;
}
@@ -141,6 +165,10 @@ static inline void packet_seg_copy_md(odp_packet_hdr_t
*dst,
dst->buf_hdr.uarea_addr = src->buf_hdr.uarea_addr;
dst->buf_hdr.uarea_size = src->buf_hdr.uarea_size;
+ /* reference related metadata */
+ dst->ref_len = src->ref_len;
+ dst->unshared_len = src->unshared_len;
+
/* segmentation data is not copied:
* buf_hdr.seg[]
* buf_hdr.segcount
@@ -155,7 +183,15 @@ static inline void *packet_map(odp_packet_hdr_t *pkt_hdr,
int seg = 0;
int seg_count = pkt_hdr->buf_hdr.segcount;
- if (odp_unlikely(offset >= pkt_hdr->frame_len))
+ /* Special processing for references */
+ while (offset >= pkt_hdr->frame_len && pkt_hdr->ref_hdr) {
+ offset -= (pkt_hdr->frame_len - pkt_hdr->ref_offset);
+ offset += (pkt_hdr->ref_hdr->frame_len - pkt_hdr->ref_len);
+ pkt_hdr = pkt_hdr->ref_hdr;
+ seg_count = pkt_hdr->buf_hdr.segcount;
+ }
+
+ if (odp_unlikely(offset > pkt_hdr->frame_len))
return NULL;
if (odp_likely(CONFIG_PACKET_MAX_SEGS == 1 || seg_count == 1)) {
@@ -249,6 +285,11 @@ static inline void packet_init(odp_packet_hdr_t *pkt_hdr,
uint32_t len,
CONFIG_PACKET_TAILROOM;
pkt_hdr->input = ODP_PKTIO_INVALID;
+
+ /* By default packet has no references */
+ pkt_hdr->ref_hdr = NULL;
+ pkt_hdr->ref_offset = 0;
+ pkt_hdr->unshared_len = len;
}
static inline odp_packet_hdr_t *init_segments(odp_buffer_t buf[], int num)
@@ -261,6 +302,7 @@ static inline odp_packet_hdr_t *init_segments(odp_buffer_t
buf[], int num)
pkt_hdr->buf_hdr.seg[0].data = pkt_hdr->buf_hdr.base_data;
pkt_hdr->buf_hdr.seg[0].len = pkt_hdr->buf_hdr.base_len;
+ packet_ref_count_set(pkt_hdr, 1);
/* Link segments */
if (odp_unlikely(CONFIG_PACKET_MAX_SEGS != 1)) {
@@ -272,6 +314,7 @@ static inline odp_packet_hdr_t *init_segments(odp_buffer_t
buf[], int num)
odp_buffer_hdr_t *b_hdr;
hdr = odp_packet_hdr((odp_packet_t)buf[i]);
+ packet_ref_count_set(hdr, 1);
b_hdr = &hdr->buf_hdr;
pkt_hdr->buf_hdr.seg[i].hdr = hdr;
@@ -399,13 +442,18 @@ static inline odp_packet_hdr_t
*add_segments(odp_packet_hdr_t *pkt_hdr,
static inline void free_bufs(odp_packet_hdr_t *pkt_hdr, int first, int num)
{
- int i;
+ int i, nfree;
odp_buffer_t buf[num];
- for (i = 0; i < num; i++)
- buf[i] = buffer_handle(pkt_hdr->buf_hdr.seg[first + i].hdr);
+ for (i = 0, nfree = 0; i < num; i++) {
+ odp_packet_hdr_t *hdr = pkt_hdr->buf_hdr.seg[first + i].hdr;
+
+ if (packet_ref_dec(hdr) == 1)
+ buf[nfree++] = buffer_handle(hdr);
+ }
- buffer_free_multi(buf, num);
+ if (nfree > 0)
+ buffer_free_multi(buf, nfree);
}
static inline odp_packet_hdr_t *free_segments(odp_packet_hdr_t *pkt_hdr,
@@ -416,11 +464,15 @@ static inline odp_packet_hdr_t
*free_segments(odp_packet_hdr_t *pkt_hdr,
if (head) {
odp_packet_hdr_t *new_hdr;
- int i;
+ int i, nfree;
odp_buffer_t buf[num];
- for (i = 0; i < num; i++)
- buf[i] = buffer_handle(pkt_hdr->buf_hdr.seg[i].hdr);
+ for (i = 0, nfree = 0; i < num; i++) {
+ new_hdr = pkt_hdr->buf_hdr.seg[i].hdr;
+
+ if (packet_ref_dec(new_hdr) == 1)
+ buf[nfree++] = buffer_handle(new_hdr);
+ }
/* First remaining segment is the new packet descriptor */
new_hdr = pkt_hdr->buf_hdr.seg[num].hdr;
@@ -437,7 +489,8 @@ static inline odp_packet_hdr_t
*free_segments(odp_packet_hdr_t *pkt_hdr,
pkt_hdr = new_hdr;
- buffer_free_multi(buf, num);
+ if (nfree > 0)
+ buffer_free_multi(buf, nfree);
} else {
/* Free last 'num' bufs */
free_bufs(pkt_hdr, num_remain, num);
@@ -546,45 +599,34 @@ int odp_packet_alloc_multi(odp_pool_t pool_hdl, uint32_t
len,
return num;
}
-void odp_packet_free(odp_packet_t pkt)
+static inline void packet_free(odp_packet_hdr_t *pkt_hdr)
{
- odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(pkt);
- int num_seg = pkt_hdr->buf_hdr.segcount;
-
- if (odp_likely(CONFIG_PACKET_MAX_SEGS == 1 || num_seg == 1))
- buffer_free_multi((odp_buffer_t *)&pkt, 1);
- else
- free_bufs(pkt_hdr, 0, num_seg);
-}
+ odp_packet_hdr_t *ref_hdr;
+ uint32_t ref_count;
-void odp_packet_free_multi(const odp_packet_t pkt[], int num)
-{
- if (CONFIG_PACKET_MAX_SEGS == 1) {
- buffer_free_multi((const odp_buffer_t * const)pkt, num);
- } else {
- odp_buffer_t buf[num * CONFIG_PACKET_MAX_SEGS];
- int i, j;
- int bufs = 0;
+ do {
+ ref_hdr = pkt_hdr->ref_hdr;
+ ref_count = packet_ref_count(pkt_hdr) - 1;
+ free_bufs(pkt_hdr, 0, pkt_hdr->buf_hdr.segcount);
- for (i = 0; i < num; i++) {
- odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(pkt[i]);
- int num_seg = pkt_hdr->buf_hdr.segcount;
- odp_buffer_hdr_t *buf_hdr = &pkt_hdr->buf_hdr;
+ if (ref_count == 1)
+ pkt_hdr->unshared_len = pkt_hdr->frame_len;
- buf[bufs] = (odp_buffer_t)pkt[i];
- bufs++;
+ pkt_hdr = ref_hdr;
+ } while (pkt_hdr);
+}
- if (odp_likely(num_seg == 1))
- continue;
+void odp_packet_free(odp_packet_t pkt)
+{
+ packet_free(odp_packet_hdr(pkt));
+}
- for (j = 1; j < num_seg; j++) {
- buf[bufs] = buffer_handle(buf_hdr->seg[j].hdr);
- bufs++;
- }
- }
+void odp_packet_free_multi(const odp_packet_t pkt[], int num)
+{
+ int i;
- buffer_free_multi(buf, bufs);
- }
+ for (i = 0; i < num; i++)
+ packet_free(odp_packet_hdr(pkt[i]));
}
int odp_packet_reset(odp_packet_t pkt, uint32_t len)
@@ -595,6 +637,9 @@ int odp_packet_reset(odp_packet_t pkt, uint32_t len)
if (len > pool->headroom + pool->data_size + pool->tailroom)
return -1;
+ if (pkt_hdr->ref_hdr)
+ packet_free(pkt_hdr->ref_hdr);
+
packet_init(pkt_hdr, len, 0);
return 0;
@@ -637,15 +682,21 @@ void *odp_packet_head(odp_packet_t pkt)
uint32_t odp_packet_buf_len(odp_packet_t pkt)
{
odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(pkt);
+ uint32_t buf_len = 0;
- return pkt_hdr->buf_hdr.size * pkt_hdr->buf_hdr.segcount;
+ do {
+ buf_len += pkt_hdr->buf_hdr.size * pkt_hdr->buf_hdr.segcount;
+ pkt_hdr = pkt_hdr->ref_hdr;
+ } while (pkt_hdr);
+
+ return buf_len;
}
void *odp_packet_data(odp_packet_t pkt)
{
odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(pkt);
- return packet_data(pkt_hdr);
+ return packet_map(pkt_hdr, 0, NULL, NULL);
}
uint32_t odp_packet_seg_len(odp_packet_t pkt)
@@ -657,7 +708,34 @@ uint32_t odp_packet_seg_len(odp_packet_t pkt)
uint32_t odp_packet_len(odp_packet_t pkt)
{
- return odp_packet_hdr(pkt)->frame_len;
+ return packet_len(odp_packet_hdr(pkt));
+}
+
+uint32_t odp_packet_unshared_len(odp_packet_t pkt)
+{
+ odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(pkt);
+ uint32_t pkt_len = 0, offset = 0, refs = 0;
+
+ do {
+ if (packet_ref_count(pkt_hdr) > 1) {
+ if (refs)
+ break;
+
+ return pkt_hdr->unshared_len;
+ }
+
+ pkt_len += pkt_hdr->frame_len - offset;
+ offset = pkt_hdr->ref_offset;
+
+ if (pkt_hdr->ref_hdr)
+ offset += (pkt_hdr->ref_hdr->frame_len -
+ pkt_hdr->ref_len);
+
+ pkt_hdr = pkt_hdr->ref_hdr;
+ refs++;
+ } while (pkt_hdr);
+
+ return pkt_len;
}
uint32_t odp_packet_headroom(odp_packet_t pkt)
@@ -667,12 +745,12 @@ uint32_t odp_packet_headroom(odp_packet_t pkt)
uint32_t odp_packet_tailroom(odp_packet_t pkt)
{
- return odp_packet_hdr(pkt)->tailroom;
+ return odp_packet_last_hdr(pkt, NULL)->tailroom;
}
void *odp_packet_tail(odp_packet_t pkt)
{
- odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(pkt);
+ odp_packet_hdr_t *pkt_hdr = odp_packet_last_hdr(pkt, NULL);
return packet_tail(pkt_hdr);
}
@@ -871,7 +949,7 @@ int odp_packet_extend_head(odp_packet_t *pkt, uint32_t len,
{
odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(*pkt);
uint32_t frame_len = pkt_hdr->frame_len;
- uint32_t headroom = pkt_hdr->headroom;
+ uint32_t headroom = pkt_hdr->headroom;
int ret = 0;
if (len > headroom) {
@@ -886,6 +964,13 @@ int odp_packet_extend_head(odp_packet_t *pkt, uint32_t len,
segs = pkt_hdr->buf_hdr.segcount;
if (odp_unlikely((segs + num) > CONFIG_PACKET_MAX_SEGS)) {
+ /* Fail request if this is a referenced packet
+ * since we cannot alter packet structure in this
+ * case. Note that this should be an extremely
+ * rare event. */
+ if (packet_ref_count(pkt_hdr) > 1)
+ return -1;
+
/* Cannot directly add new segments */
odp_packet_hdr_t *new_hdr;
int new_segs = 0;
@@ -938,6 +1023,7 @@ int odp_packet_extend_head(odp_packet_t *pkt, uint32_t len,
pkt_hdr->buf_hdr.segcount = segs;
pkt_hdr->frame_len = frame_len;
+ pkt_hdr->unshared_len = frame_len;
pkt_hdr->headroom = offset + pool->headroom;
pkt_hdr->tailroom = pool->tailroom;
@@ -963,11 +1049,16 @@ int odp_packet_extend_head(odp_packet_t *pkt, uint32_t
len,
push_head(pkt_hdr, len);
}
- if (data_ptr)
- *data_ptr = packet_data(pkt_hdr);
+ if (data_ptr || seg_len) {
+ uint32_t seg_ln = 0;
+ void *data = packet_map(pkt_hdr, 0, &seg_ln, NULL);
- if (seg_len)
- *seg_len = packet_first_seg_len(pkt_hdr);
+ if (data_ptr)
+ *data_ptr = data;
+
+ if (seg_len)
+ *seg_len = seg_ln;
+ }
return ret;
}
@@ -979,6 +1070,8 @@ void *odp_packet_pull_head(odp_packet_t pkt, uint32_t len)
if (len > pkt_hdr->frame_len)
return NULL;
+ ODP_ASSERT(len <= pkt_hdr->unshared_len);
+
pull_head(pkt_hdr, len);
return packet_data(pkt_hdr);
}
@@ -986,15 +1079,40 @@ void *odp_packet_pull_head(odp_packet_t pkt, uint32_t
len)
int odp_packet_trunc_head(odp_packet_t *pkt, uint32_t len,
void **data_ptr, uint32_t *seg_len_out)
{
- odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(*pkt);
+ odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(*pkt), *nxt_hdr;
uint32_t seg_len = packet_first_seg_len(pkt_hdr);
+ int ret = 0;
- if (len > pkt_hdr->frame_len)
+ if (len > packet_len(pkt_hdr))
return -1;
- if (len < seg_len) {
+ ODP_ASSERT(len <= odp_packet_unshared_len(*pkt));
+
+ /* Special processing for references */
+ while (len >= pkt_hdr->frame_len && pkt_hdr->ref_hdr) {
+ ODP_ASSERT(packet_ref_count(pkt_hdr) == 1);
+ nxt_hdr = pkt_hdr->ref_hdr;
+ len -= pkt_hdr->frame_len;
+
+ if (len > 0) {
+ len += pkt_hdr->ref_offset +
+ (nxt_hdr->frame_len - pkt_hdr->ref_len);
+ pkt_hdr->ref_hdr = NULL;
+ packet_free(pkt_hdr);
+ pkt_hdr = nxt_hdr;
+ seg_len = packet_first_seg_len(pkt_hdr);
+ *pkt = packet_handle(pkt_hdr);
+ ret = 1;
+ } else {
+ pkt_hdr->frame_len = 0;
+ }
+ }
+
+ if (CONFIG_PACKET_MAX_SEGS == 1 ||
+ len < seg_len ||
+ pkt_hdr->buf_hdr.segcount == 1) {
pull_head(pkt_hdr, len);
- } else if (CONFIG_PACKET_MAX_SEGS != 1) {
+ } else {
int num = 0;
uint32_t pull_len = 0;
@@ -1009,23 +1127,29 @@ int odp_packet_trunc_head(odp_packet_t *pkt, uint32_t
len,
*pkt = packet_handle(pkt_hdr);
}
- if (data_ptr)
- *data_ptr = packet_data(pkt_hdr);
+ if (data_ptr || seg_len_out) {
+ void *data_head = packet_map(pkt_hdr, 0, &seg_len, NULL);
- if (seg_len_out)
- *seg_len_out = packet_first_seg_len(pkt_hdr);
+ if (data_ptr)
+ *data_ptr = data_head;
- return 0;
+ if (seg_len_out)
+ *seg_len_out = seg_len;
+ }
+
+ return ret;
}
void *odp_packet_push_tail(odp_packet_t pkt, uint32_t len)
{
- odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(pkt);
+ odp_packet_hdr_t *pkt_hdr = odp_packet_last_hdr(pkt, NULL);
void *old_tail;
if (len > pkt_hdr->tailroom)
return NULL;
+ ODP_ASSERT(packet_ref_count(pkt_hdr) == 1);
+
old_tail = packet_tail(pkt_hdr);
push_tail(pkt_hdr, len);
@@ -1035,12 +1159,14 @@ void *odp_packet_push_tail(odp_packet_t pkt, uint32_t
len)
int odp_packet_extend_tail(odp_packet_t *pkt, uint32_t len,
void **data_ptr, uint32_t *seg_len_out)
{
- odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(*pkt);
+ odp_packet_hdr_t *pkt_hdr = odp_packet_last_hdr(*pkt, NULL);
uint32_t frame_len = pkt_hdr->frame_len;
uint32_t tailroom = pkt_hdr->tailroom;
uint32_t tail_off = frame_len;
int ret = 0;
+ ODP_ASSERT(packet_ref_count(pkt_hdr) == 1);
+
if (len > tailroom) {
pool_t *pool = pool_entry_from_hdl(pkt_hdr->buf_hdr.pool_hdl);
int num;
@@ -1132,6 +1258,7 @@ void *odp_packet_pull_tail(odp_packet_t pkt, uint32_t len)
if (len > packet_last_seg_len(pkt_hdr))
return NULL;
+ ODP_ASSERT(packet_ref_count(pkt_hdr) == 1);
pull_tail(pkt_hdr, len);
return packet_tail(pkt_hdr);
@@ -1142,17 +1269,34 @@ int odp_packet_trunc_tail(odp_packet_t *pkt, uint32_t
len,
{
int last;
uint32_t seg_len;
- odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(*pkt);
+ uint32_t offset;
+ odp_packet_hdr_t *first_hdr = odp_packet_hdr(*pkt);
+ odp_packet_hdr_t *pkt_hdr, *prev_hdr;
- if (len > pkt_hdr->frame_len)
+ if (len > packet_len(first_hdr))
return -1;
+ pkt_hdr = odp_packet_last_hdr(*pkt, &offset);
+
+ /* Special processing for references */
+ while (len >= pkt_hdr->frame_len - offset && first_hdr->ref_hdr) {
+ len -= (pkt_hdr->frame_len - offset);
+ prev_hdr = odp_packet_prev_hdr(first_hdr, pkt_hdr, &offset);
+ ODP_ASSERT(packet_ref_count(pkt_hdr) == 1);
+ prev_hdr->ref_hdr = NULL;
+ packet_free(pkt_hdr);
+ pkt_hdr = prev_hdr;
+ }
+
+ ODP_ASSERT(packet_ref_count(pkt_hdr) == 1);
last = packet_last_seg(pkt_hdr);
seg_len = packet_seg_len(pkt_hdr, last);
- if (len < seg_len) {
+ if (CONFIG_PACKET_MAX_SEGS == 1 ||
+ len < seg_len ||
+ pkt_hdr->buf_hdr.segcount == 1) {
pull_tail(pkt_hdr, len);
- } else if (CONFIG_PACKET_MAX_SEGS != 1) {
+ } else {
int num = 0;
uint32_t pull_len = 0;
@@ -1359,35 +1503,50 @@ void odp_packet_ts_set(odp_packet_t pkt, odp_time_t
timestamp)
int odp_packet_is_segmented(odp_packet_t pkt)
{
- return odp_packet_hdr(pkt)->buf_hdr.segcount > 1;
+ odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(pkt);
+
+ return pkt_hdr->buf_hdr.segcount > 1 || pkt_hdr->ref_hdr != NULL;
}
int odp_packet_num_segs(odp_packet_t pkt)
{
odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(pkt);
+ uint32_t segcount = 0, i;
+ uint32_t seg_offset = 0, offset;
+
+ do {
+ segcount += pkt_hdr->buf_hdr.segcount - seg_offset;
+ offset = pkt_hdr->ref_offset;
+ pkt_hdr = pkt_hdr->ref_hdr;
+ if (pkt_hdr) {
+ for (i = 0, seg_offset = 0;
+ i < pkt_hdr->buf_hdr.segcount;
+ i++, seg_offset++) {
+ if (offset < pkt_hdr->buf_hdr.seg[i].len)
+ break;
+ offset -= pkt_hdr->buf_hdr.seg[i].len;
+ }
+ }
+ } while (pkt_hdr);
- return pkt_hdr->buf_hdr.segcount;
+ return segcount;
}
-odp_packet_seg_t odp_packet_first_seg(odp_packet_t pkt)
+odp_packet_seg_t odp_packet_first_seg(odp_packet_t pkt ODP_UNUSED)
{
- (void)pkt;
-
return 0;
}
odp_packet_seg_t odp_packet_last_seg(odp_packet_t pkt)
{
- odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(pkt);
-
- return packet_last_seg(pkt_hdr);
+ return (odp_packet_seg_t)(odp_packet_num_segs(pkt) - 1);
}
odp_packet_seg_t odp_packet_next_seg(odp_packet_t pkt, odp_packet_seg_t seg)
{
odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(pkt);
- if (odp_unlikely(seg >= (odp_packet_seg_t)packet_last_seg(pkt_hdr)))
+ if (odp_unlikely(seg >= packet_last_seg(pkt_hdr)))
return ODP_PACKET_SEG_INVALID;
return seg + 1;
@@ -1403,21 +1562,51 @@ odp_packet_seg_t odp_packet_next_seg(odp_packet_t pkt,
odp_packet_seg_t seg)
void *odp_packet_seg_data(odp_packet_t pkt, odp_packet_seg_t seg)
{
odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(pkt);
+ uint32_t seg_offset = 0, offset = 0, i;
+
+ while (seg >= pkt_hdr->buf_hdr.segcount - seg_offset &&
+ pkt_hdr->ref_hdr) {
+ seg -= (pkt_hdr->buf_hdr.segcount - seg_offset);
+ offset = pkt_hdr->ref_offset;
+ pkt_hdr = pkt_hdr->ref_hdr;
+ for (i = 0, seg_offset = 0;
+ i < pkt_hdr->buf_hdr.segcount;
+ i++, seg_offset++) {
+ if (offset < pkt_hdr->buf_hdr.seg[i].len)
+ break;
+ offset -= pkt_hdr->buf_hdr.seg[i].len;
+ }
+ }
- if (odp_unlikely(seg >= pkt_hdr->buf_hdr.segcount))
+ if (odp_unlikely(seg + seg_offset >= pkt_hdr->buf_hdr.segcount))
return NULL;
- return packet_seg_data(pkt_hdr, seg);
+ return packet_seg_data(pkt_hdr, seg + seg_offset) + offset;
}
uint32_t odp_packet_seg_data_len(odp_packet_t pkt, odp_packet_seg_t seg)
{
odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(pkt);
+ uint32_t seg_offset = 0, offset = 0, i;
+
+ while (seg >= pkt_hdr->buf_hdr.segcount - seg_offset &&
+ pkt_hdr->ref_hdr) {
+ seg -= (pkt_hdr->buf_hdr.segcount - seg_offset);
+ offset = pkt_hdr->ref_offset;
+ pkt_hdr = pkt_hdr->ref_hdr;
+ for (i = 0, seg_offset = 0;
+ i < pkt_hdr->buf_hdr.segcount;
+ i++, seg_offset++) {
+ if (offset < pkt_hdr->buf_hdr.seg[i].len)
+ break;
+ offset -= pkt_hdr->buf_hdr.seg[i].len;
+ }
+ }
- if (odp_unlikely(seg >= pkt_hdr->buf_hdr.segcount))
+ if (odp_unlikely(seg + seg_offset >= pkt_hdr->buf_hdr.segcount))
return 0;
- return packet_seg_len(pkt_hdr, seg);
+ return packet_seg_len(pkt_hdr, seg + seg_offset) - offset;
}
/*
@@ -1431,7 +1620,7 @@ int odp_packet_add_data(odp_packet_t *pkt_ptr, uint32_t
offset, uint32_t len)
{
odp_packet_t pkt = *pkt_ptr;
odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(pkt);
- uint32_t pktlen = pkt_hdr->frame_len;
+ uint32_t pktlen = packet_len(pkt_hdr);
odp_packet_t newpkt;
if (offset > pktlen)
@@ -1499,6 +1688,8 @@ int odp_packet_align(odp_packet_t *pkt, uint32_t offset,
uint32_t len,
if (align > ODP_CACHE_LINE_SIZE)
return -1;
+ ODP_ASSERT(odp_packet_has_ref(*pkt) == 0);
+
if (seglen >= len) {
misalign = align <= 1 ? 0 :
ODP_ALIGN_ROUNDUP(uaddr, align) - uaddr;
@@ -1580,6 +1771,114 @@ int odp_packet_split(odp_packet_t *pkt, uint32_t len,
odp_packet_t *tail)
}
/*
+ * References
+ */
+
+static inline void packet_ref(odp_packet_hdr_t *pkt_hdr)
+{
+ uint32_t i;
+ odp_packet_hdr_t *hdr;
+
+ do {
+ for (i = 0; i < pkt_hdr->buf_hdr.segcount; i++) {
+ hdr = pkt_hdr->buf_hdr.seg[i].hdr;
+ packet_ref_inc(hdr);
+ }
+
+ pkt_hdr = pkt_hdr->ref_hdr;
+ } while (pkt_hdr);
+}
+
+static inline odp_packet_t packet_splice(odp_packet_t pkt, uint32_t offset,
+ odp_packet_t hdr)
+{
+ odp_packet_hdr_t *ref_hdr, *pkt_hdr;
+
+ pkt_hdr = odp_packet_hdr(pkt);
+ ref_hdr = odp_packet_hdr(hdr);
+
+ /* Catch attempted references to stale handles in debug builds */
+ ODP_ASSERT(packet_ref_count(pkt_hdr) > 0);
+
+ /* Splicing is from the last section of src pkt */
+ while (ref_hdr->ref_hdr)
+ ref_hdr = ref_hdr->ref_hdr;
+
+ /* Find section where splice begins */
+ while (offset >= pkt_hdr->frame_len && pkt_hdr->ref_hdr) {
+ offset -= (pkt_hdr->frame_len - pkt_hdr->ref_offset);
+ offset += (pkt_hdr->ref_hdr->frame_len - pkt_hdr->ref_len);
+ pkt_hdr = pkt_hdr->ref_hdr;
+ }
+
+ ref_hdr->ref_hdr = pkt_hdr;
+ ref_hdr->ref_offset = offset;
+ ref_hdr->ref_len = pkt_hdr->frame_len;
+
+ if (offset < pkt_hdr->unshared_len)
+ pkt_hdr->unshared_len = offset;
+
+ packet_ref(pkt_hdr);
+ return hdr;
+}
+
+odp_packet_t odp_packet_ref_static(odp_packet_t pkt)
+{
+ odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(pkt);
+
+ pkt_hdr->unshared_len = 0;
+ packet_ref(pkt_hdr);
+ return pkt;
+}
+
+odp_packet_t odp_packet_ref(odp_packet_t pkt, uint32_t offset)
+{
+ odp_packet_t hdr;
+
+ if (pkt == ODP_PACKET_INVALID || offset >= odp_packet_len(pkt))
+ return ODP_PACKET_INVALID;
+
+ hdr = odp_packet_alloc(odp_packet_pool(pkt), 0);
+
+ if (hdr == ODP_PACKET_INVALID)
+ return ODP_PACKET_INVALID;
+
+ return packet_splice(pkt, offset, hdr);
+}
+
+odp_packet_t odp_packet_ref_pkt(odp_packet_t pkt, uint32_t offset,
+ odp_packet_t hdr)
+{
+ if (pkt == ODP_PACKET_INVALID ||
+ pkt == hdr ||
+ offset >= odp_packet_len(pkt))
+ return ODP_PACKET_INVALID;
+
+ if (hdr == ODP_PACKET_INVALID)
+ return odp_packet_ref(pkt, offset);
+
+ return packet_splice(pkt, offset, hdr);
+}
+
+int odp_packet_is_ref(odp_packet_t pkt)
+{
+ odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(pkt);
+ uint32_t ref_count = 0;
+
+ while (pkt_hdr->ref_hdr) {
+ ref_count++;
+ pkt_hdr = pkt_hdr->ref_hdr;
+ }
+
+ return ref_count;
+}
+
+int odp_packet_has_ref(odp_packet_t pkt)
+{
+ return packet_ref_count(odp_packet_hdr(pkt)) - 1;
+}
+
+/*
*
* Copy
* ********************************************************
@@ -1589,7 +1888,7 @@ int odp_packet_split(odp_packet_t *pkt, uint32_t len,
odp_packet_t *tail)
odp_packet_t odp_packet_copy(odp_packet_t pkt, odp_pool_t pool)
{
odp_packet_hdr_t *srchdr = odp_packet_hdr(pkt);
- uint32_t pktlen = srchdr->frame_len;
+ uint32_t pktlen = packet_len(srchdr);
odp_packet_t newpkt = odp_packet_alloc(pool, pktlen);
if (newpkt != ODP_PACKET_INVALID) {
@@ -1600,6 +1899,7 @@ odp_packet_t odp_packet_copy(odp_packet_t pkt, odp_pool_t
pool)
}
}
+ srchdr = odp_packet_hdr(newpkt);
return newpkt;
}
@@ -1628,7 +1928,7 @@ int odp_packet_copy_to_mem(odp_packet_t pkt, uint32_t
offset,
uint8_t *dstaddr = (uint8_t *)dst;
odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(pkt);
- if (offset + len > pkt_hdr->frame_len)
+ if (offset + len > packet_len(pkt_hdr))
return -1;
while (len > 0) {
@@ -1652,7 +1952,7 @@ int odp_packet_copy_from_mem(odp_packet_t pkt, uint32_t
offset,
const uint8_t *srcaddr = (const uint8_t *)src;
odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(pkt);
- if (offset + len > pkt_hdr->frame_len)
+ if (offset + len > packet_len(pkt_hdr))
return -1;
while (len > 0) {
@@ -1680,8 +1980,8 @@ int odp_packet_copy_from_pkt(odp_packet_t dst, uint32_t
dst_offset,
uint32_t src_seglen = 0; /* GCC */
int overlap;
- if (dst_offset + len > dst_hdr->frame_len ||
- src_offset + len > src_hdr->frame_len)
+ if (dst_offset + len > packet_len(dst_hdr) ||
+ src_offset + len > packet_len(src_hdr))
return -1;
overlap = (dst_hdr == src_hdr &&
@@ -1767,7 +2067,7 @@ void odp_packet_print(odp_packet_t pkt)
len += snprintf(&str[len], n - len,
" l4_offset %" PRIu32 "\n", hdr->p.l4_offset);
len += snprintf(&str[len], n - len,
- " frame_len %" PRIu32 "\n", hdr->frame_len);
+ " frame_len %" PRIu32 "\n", packet_len(hdr));
len += snprintf(&str[len], n - len,
" input %" PRIu64 "\n",
odp_pktio_to_u64(hdr->input));
--
2.7.4
