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ena: Clear NS_MOREFRAG flag for last netmap slot

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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)
Sponsored by: Amazon, Inc.

(cherry picked from commit 2f17afd19a3534dc1755c52edb0c2f70ea0eb1e4)
This commit is contained in:
Osama Abboud 2024-08-07 06:24:21 +00:00 committed by Osama Abboud
parent b0830d2b6b
commit 8b43095ad8
1 changed files with 1 additions and 1 deletions
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2
sys/dev/ena/ena_netmap.c
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@ -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;