net/virtio: introduce helper for clearing net header

This patch introduces a helper for clearing the virtio net header
to avoid the code duplication. Macro is used as it shows slightly
better performance.

Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c
index c888aa9..60fa3aa 100644 (file)
--- a/drivers/net/virtio/virtio_rxtx.c
+++ b/drivers/net/virtio/virtio_rxtx.c
@@ -519,6 +519,15 @@ virtio_tso_fix_cksum(struct rte_mbuf *m)
                (var) = (val);                  \
 } while (0)
 
+#define virtqueue_clear_net_hdr(_hdr) do {             \
+       ASSIGN_UNLESS_EQUAL((_hdr)->csum_start, 0);     \
+       ASSIGN_UNLESS_EQUAL((_hdr)->csum_offset, 0);    \
+       ASSIGN_UNLESS_EQUAL((_hdr)->flags, 0);          \
+       ASSIGN_UNLESS_EQUAL((_hdr)->gso_type, 0);       \
+       ASSIGN_UNLESS_EQUAL((_hdr)->gso_size, 0);       \
+       ASSIGN_UNLESS_EQUAL((_hdr)->hdr_len, 0);        \
+} while (0)
+
 static inline void
 virtqueue_xmit_offload(struct virtio_net_hdr *hdr,
                        struct rte_mbuf *cookie,
@@ -594,18 +603,11 @@ virtqueue_enqueue_xmit_inorder(struct virtnet_tx *txvq,
                        rte_pktmbuf_prepend(cookies[i], head_size);
                cookies[i]->pkt_len -= head_size;
 
-               /* if offload disabled, it is not zeroed below, do it now */
-               if (!vq->hw->has_tx_offload) {
-                       ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
-                       ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
-                       ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
-                       ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
-                       ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
-                       ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
-               }
-
-               virtqueue_xmit_offload(hdr, cookies[i],
-                               vq->hw->has_tx_offload);
+               /* if offload disabled, hdr is not zeroed yet, do it now */
+               if (!vq->hw->has_tx_offload)
+                       virtqueue_clear_net_hdr(hdr);
+               else
+                       virtqueue_xmit_offload(hdr, cookies[i], true);
 
                start_dp[idx].addr  = VIRTIO_MBUF_DATA_DMA_ADDR(cookies[i], vq);
                start_dp[idx].len   = cookies[i]->data_len;
@@ -659,14 +661,8 @@ virtqueue_enqueue_xmit_packed(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
                cookie->pkt_len -= head_size;
 
                /* if offload disabled, it is not zeroed below, do it now */
-               if (!vq->hw->has_tx_offload) {
-                       ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
-                       ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
-                       ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
-                       ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
-                       ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
-                       ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
-               }
+               if (!vq->hw->has_tx_offload)
+                       virtqueue_clear_net_hdr(hdr);
        } else {
                /* setup first tx ring slot to point to header
                 * stored in reserved region.
@@ -758,14 +754,8 @@ virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
                cookie->pkt_len -= head_size;
 
                /* if offload disabled, it is not zeroed below, do it now */
-               if (!vq->hw->has_tx_offload) {
-                       ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
-                       ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
-                       ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
-                       ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
-                       ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
-                       ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
-               }
+               if (!vq->hw->has_tx_offload)
+                       virtqueue_clear_net_hdr(hdr);
        } else if (use_indirect) {
                /* setup tx ring slot to point to indirect
                 * descriptor list stored in reserved region.