libmemif: set data offset for memif buffer
Update descriptor offset based on data pointer
in memif_buffer_t.
Slave only, master will not modify the descriptor.
Type: feature
@@ -2492,7 +2492,10 @@ memif_tx_burst (memif_conn_handle_t conn, uint16_t qid,
memif_queue_t *mq = &c->tx_queues[qid];
memif_ring_t *ring = mq->ring;
uint16_t mask = (1 << mq->log2_ring_size) - 1;
+ uint32_t offset_mask = c->run_args.buffer_size - 1;
memif_buffer_t *b0;
+ memif_desc_t *d;
+ int64_t data_offset;
*tx = 0;
int err = MEMIF_ERR_SUCCESS;
@@ -2515,7 +2518,27 @@ memif_tx_burst (memif_conn_handle_t conn, uint16_t qid,
err = MEMIF_ERR_INVAL_ARG;
goto done;
}
- ring->desc[b0->desc_index & mask].length = b0->len;
+ d = &ring->desc[b0->desc_index & mask];
+ d->length = b0->len;
+ if (!c->args.is_master)
+ {
+ // reset headroom
+ d->offset = d->offset - (d->offset & offset_mask);
+ // calculate offset from user data
+ data_offset = b0->data - (d->offset + c->regions[d->region].addr);
+ if (data_offset != 0)
+ {
+ /* verify data offset */
+ if ((data_offset < 0) ||
+ (data_offset > (d->offset + offset_mask)))
+ {
+ printf ("%ld\n", data_offset);
+ err = MEMIF_ERR_INVAL_ARG;
+ goto done;
+ }
+ d->offset += data_offset;
+ }
+ }
#ifdef MEMIF_DBG_SHM
printf ("offset: %-6d\n", ring->desc[b0->desc_index & mask].offset);
@@ -2608,7 +2631,7 @@ memif_rx_burst (memif_conn_handle_t conn, uint16_t qid,
b0->flags |= MEMIF_BUFFER_FLAG_NEXT;
ring->desc[cur_slot & mask].flags &= ~MEMIF_DESC_FLAG_NEXT;
}
-/* b0->offset = ring->desc[cur_slot & mask].offset;*/
+
b0->queue = mq;
#ifdef MEMIF_DBG_SHM
printf ("data: %p\n", b0->data);
