Both legs of the loop share the same logic: the common parts are about
reserving and filling both address and length into the description.

This is moved into reserve_and_fill().

Bugzilla ID: 1440
Suggested-by: Maryam Tahhan <mtahhan@redhat.com>
Signed-off-by: Ariel Otilibili <ariel.otilibili@6wind.com>
---
 drivers/net/af_xdp/rte_eth_af_xdp.c | 62 ++++++++++++++++-------------
 1 file changed, 34 insertions(+), 28 deletions(-)

diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c b/drivers/net/af_xdp/rte_eth_af_xdp.c
index 092bcb73aa0a..840a12dbf508 100644
--- a/drivers/net/af_xdp/rte_eth_af_xdp.c
+++ b/drivers/net/af_xdp/rte_eth_af_xdp.c
@@ -536,6 +536,31 @@ kick_tx(struct pkt_tx_queue *txq, struct xsk_ring_cons *cq)
                }
 }

+static inline struct xdp_desc *
+reserve_and_fill(struct pkt_tx_queue *txq, struct rte_mbuf *mbuf,
+                struct xsk_umem_info *umem)
+{
+       struct xdp_desc *desc = NULL;
+       uint32_t *idx_tx = NULL;

+       uint64_t addr, offset;
+
+       if (!xsk_ring_prod__reserve(&txq->tx, 1, idx_tx))
+               goto out;
+
+       desc = xsk_ring_prod__tx_desc(&txq->tx, *idx_tx);
+       desc->len = mbuf->pkt_len;
+
+       addr = (uint64_t)mbuf - (uint64_t)umem->buffer
+               - umem->mb_pool->header_size;
+       offset = rte_pktmbuf_mtod(mbuf, uint64_t) - (uint64_t)mbuf
+               + umem->mb_pool->header_size;
+       offset = offset << XSK_UNALIGNED_BUF_OFFSET_SHIFT;
+       desc->addr = addr | offset;
+
+out:
+       return desc;
+}
+
<snip>