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libmemif: set next free buffer

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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
This commit is contained in:
Jakub Grajciar
2021-01-08 15:32:43 +01:00
committed by Damjan Marion
parent 18327be5d4
commit 47e68de222
2 changed files with 41 additions and 0 deletions
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11
extras/libmemif/src/libmemif.h
View File

@ -648,6 +648,17 @@ int memif_buffer_alloc (memif_conn_handle_t conn, uint16_t qid,
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

30
extras/libmemif/src/main.c
View File

@ -2151,6 +2151,36 @@ memif_init_regions_and_queues (memif_connection_t * conn)
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)