ena: Clear NS_MOREFRAG flag for last netmap slot

When processing packets within the rx-flow
ena_netmap_rx_load_desc doesn't know the number of descriptors, so it
sets NS_MOREFRAG to all the slots to indicate that there are more
fragments for this packet.
The code calls ena_netmap_rx_load_desc() for every descriptor in
this packet to map the relevant buffer into the netmap shared memory.
After ena_netmap_rx_load_desc() calls, we need to unset the NS_MOREFRAG
for the last fragment to indicate that this is the last fragment,
so we explicitly turn off NS_MOREFRAG flag.
Current code overrides all other flags and sets NS_BUF_CHANGED.
This patch unsets the relevant flag only.

Approved by: cperciva (mentor)
MFC after: 2 weeks
Sponsored by: Amazon, Inc.

1 files changed, 1 insertions, 1 deletions

diff --git a/sys/dev/ena/ena_netmap.c b/sys/dev/ena/ena_netmap.c
index eef8021b8569..8a220373ec3f 100644
--- a/sys/dev/ena/ena_netmap.c
+++ b/sys/dev/ena/ena_netmap.c
@@ -964,7 +964,7 @@ ena_netmap_rx_frame(struct ena_netmap_ctx *ctx)
 	 * It just set flag NS_MOREFRAG to all slots, then here flag of
 	 * last slot is cleared.
 	 */
-	ctx->slots[nm_prev(ctx->nm_i, ctx->lim)].flags = NS_BUF_CHANGED;
+	ctx->slots[nm_prev(ctx->nm_i, ctx->lim)].flags &= ~NS_MOREFRAG;
 
 	if (rc != 0) {
 		goto rx_clear_desc;