libmemif: set next free buffer
Adds memif_set_next_free_buffer - set internal pointer
to next free descriptor for any tx queue.
Type: feature
Signed-off-by: Jakub Grajciar <jgrajcia@cisco.com>
Change-Id: Ia24345a886a52c25c1723c6dbce023f2aed4a42c
diff --git a/extras/libmemif/src/libmemif.h b/extras/libmemif/src/libmemif.h
index 379ccd1..0146bb7 100644
--- a/extras/libmemif/src/libmemif.h
+++ b/extras/libmemif/src/libmemif.h
@@ -648,6 +648,17 @@
memif_buffer_t * bufs, uint16_t count,
uint16_t * count_out, uint16_t size);
+/** \brief Memif set next free buffer
+ @param conn - memif connection handle
+ @param qid - number identifying queue
+ @param buf - next free buffer
+
+ Sets next free descriptor pointer for specified tx queue.
+ The next allocation will happen at this buffer.
+*/
+int memif_set_next_free_buffer (memif_conn_handle_t conn, uint16_t qid,
+ memif_buffer_t *buf);
+
/** \brief Memif refill queue
@param conn - memif connection handle
@param qid - number identifying queue
diff --git a/extras/libmemif/src/main.c b/extras/libmemif/src/main.c
index f5b1b5d..0644f94 100644
--- a/extras/libmemif/src/main.c
+++ b/extras/libmemif/src/main.c
@@ -2151,6 +2151,36 @@
return 0;
}
+int
+memif_set_next_free_buffer (memif_conn_handle_t conn, uint16_t qid,
+ memif_buffer_t *buf)
+{
+ memif_connection_t *c = (memif_connection_t *) conn;
+ if (EXPECT_FALSE (c == NULL))
+ return MEMIF_ERR_NOCONN;
+ if (EXPECT_FALSE (qid >= c->tx_queues_num))
+ return MEMIF_ERR_QID;
+ if (EXPECT_FALSE (buf == NULL))
+ return MEMIF_ERR_INVAL_ARG;
+
+ uint16_t ring_size, ns;
+ memif_queue_t *mq = &c->tx_queues[qid];
+ memif_ring_t *ring = mq->ring;
+
+ ring_size = (1 << mq->log2_ring_size);
+ if (c->args.is_master)
+ ns = ring->head - mq->next_buf;
+ else
+ ns = ring_size - mq->next_buf + ring->tail;
+
+ if ((mq->next_buf - buf->desc_index) > ns)
+ return MEMIF_ERR_INVAL_ARG;
+
+ mq->next_buf = buf->desc_index;
+
+ return MEMIF_ERR_SUCCESS;
+}
+
static void
memif_buffer_enq_at_idx_internal (memif_queue_t *from_q, memif_queue_t *to_q,
memif_buffer_t *buf, uint16_t slot)