diff options
Diffstat (limited to 'extras/libmemif/examples/common/responder.c')
| -rw-r--r-- | extras/libmemif/examples/common/responder.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/extras/libmemif/examples/common/responder.c b/extras/libmemif/examples/common/responder.c new file mode 100644 index 00000000000..e0fa9e35b08 --- /dev/null +++ b/extras/libmemif/examples/common/responder.c @@ -0,0 +1,172 @@ +#include <common.h> + +int +responder (memif_conn_handle_t conn, void *private_ctx, uint16_t qid) +{ + memif_connection_t *c = (memif_connection_t *) private_ctx; + int err, i; + uint16_t tx; + + /* receive packets from the shared memory */ + err = memif_rx_burst (conn, qid, c->rx_bufs, MAX_MEMIF_BUFS, &c->rx_buf_num); + if (err != MEMIF_ERR_SUCCESS) + { + INFO ("memif_rx_burst: %s", memif_strerror (err)); + return err; + } + + do + { + /* allocate tx buffers */ + err = memif_buffer_alloc (conn, qid, c->tx_bufs, c->rx_buf_num, + &c->tx_buf_num, 2048); + /* suppress full ring error MEMIF_ERR_NOBUF_RING */ + if (err != MEMIF_ERR_SUCCESS && err != MEMIF_ERR_NOBUF_RING) + { + INFO ("memif_buffer_alloc: %s", memif_strerror (err)); + goto error; + } + + /* Process the packets */ + if (c->packet_handler == NULL) + { + INFO ("Missing packet handler"); + goto error; + } + err = c->packet_handler (c); + if (err != 0) + { + INFO ("packet handler error: %d", err); + goto error; + } + /* Done processing packets */ + + /* refill the queue */ + err = memif_refill_queue (conn, qid, c->tx_buf_num, 0); + if (err != MEMIF_ERR_SUCCESS) + { + INFO ("memif_refill_queue: %s", memif_strerror (err)); + goto error; + } + c->rx_buf_num -= c->tx_buf_num; + + err = memif_tx_burst (conn, qid, c->tx_bufs, c->tx_buf_num, &tx); + if (err != MEMIF_ERR_SUCCESS) + { + INFO ("memif_tx_burst: %s", memif_strerror (err)); + goto error; + } + c->tx_buf_num -= tx; + + /* This should never happen */ + if (c->tx_buf_num != 0) + { + INFO ("memif_tx_burst failed to send all allocated buffers."); + goto error; + } + } + while (c->rx_buf_num > 0); + + return 0; + +error: + err = memif_refill_queue (conn, qid, c->rx_buf_num, 0); + if (err != MEMIF_ERR_SUCCESS) + { + INFO ("memif_refill_queue: %s", memif_strerror (err)); + return err; + } + c->rx_buf_num = 0; + + return -1; +} + +int +responder_zero_copy (memif_conn_handle_t conn, void *private_ctx, uint16_t qid) +{ + memif_connection_t *c = (memif_connection_t *) private_ctx; + int err, i; + uint16_t tx, tx2; + + /* receive packets from the shared memory */ + err = memif_rx_burst (conn, qid, c->rx_bufs, MAX_MEMIF_BUFS, &c->rx_buf_num); + if (err != MEMIF_ERR_SUCCESS) + { + INFO ("memif_rx_burst: %s", memif_strerror (err)); + return err; + } + + do + { + /* Note that in zero copy memif_buffer_alloc is not part of respond + process, + * instead rx buffers are used directly using memif_buffer_enq_tx. + * / + + /* Process the packets */ + if (c->packet_handler == NULL) + { + INFO ("Missing packet handler"); + goto error; + } + err = c->packet_handler (c); + if (err != 0) + { + INFO ("packet handler error: %d", err); + goto error; + } + /* Done processing packets */ + + /* Swap rx and tx buffers, swapped tx buffers are considered allocated + * and are ready to be transmitted. Notice that the buffers are swapped + * only in memif driver and locally remain in rx_bufs queue. + */ + err = memif_buffer_enq_tx (conn, qid, c->rx_bufs, c->rx_buf_num, &tx); + /* suppress full ring error MEMIF_ERR_NOBUF_RING */ + if (err != MEMIF_ERR_SUCCESS && err != MEMIF_ERR_NOBUF_RING) + { + INFO ("memif_buffer_alloc: %s", memif_strerror (err)); + goto error; + } + + /* refill the queue */ + err = memif_refill_queue (conn, qid, tx, 0); + if (err != MEMIF_ERR_SUCCESS) + { + INFO ("memif_refill_queue: %s", memif_strerror (err)); + goto error; + } + c->rx_buf_num -= tx; + + /* Notice that we send from rx_bufs as the buffers were only swapped + * internally in memif driver */ + err = memif_tx_burst (conn, qid, c->rx_bufs, tx, &tx2); + if (err != MEMIF_ERR_SUCCESS) + { + INFO ("memif_tx_burst: %s", memif_strerror (err)); + goto error; + } + tx -= tx2; + + /* This should never happen */ + if (tx != 0) + { + INFO ("memif_tx_burst failed to send all allocated buffers."); + goto error; + } + } + while (c->rx_buf_num > 0); + + return 0; + +error: + err = memif_refill_queue (conn, qid, c->rx_buf_num, 0); + if (err != MEMIF_ERR_SUCCESS) + { + INFO ("memif_refill_queue: %s", memif_strerror (err)); + return err; + } + c->rx_buf_num = 0; + + return -1; +}
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