diff mbox series

[17/21] net/ena: fix meta-desc DF flag setup

Message ID 20220222160634.24489-18-mk@semihalf.com (mailing list archive)
State Superseded, archived
Delegated to: Ferruh Yigit
Headers
Series net/ena: v2.6.0 driver update |

Checks

Context Check Description
ci/checkpatch success coding style OK

Commit Message

Michal Krawczyk Feb. 22, 2022, 4:06 p.m. UTC 
  Whenever Tx checksum offload is being used, the meta descriptor content
is taken into consideration. Setting DF field properly in the meta
descriptor may have huge impact on the performance both for the IPv4 and
IPv6 packets.

The requirements for the df field are as below:
* No offload used - value doesn't matter
* IPv4 - 0 or 1, depending on the DF flag in the IPv4 header
* IPv6 - 1

Setting DF to 0 causes the packet to enter the slow-path in the HW and
as a result can noticeable impact the performance.

Moreover, as 'true' may not always be mapped to 1 depending on it's
definition for the given platform/compiler, for safety DF field is being
set explicitly to 1.

Fixes: 1173fca25af9 ("ena: add polling-mode driver")
Cc: stable@dpdk.org

Signed-off-by: Michal Krawczyk <mk@semihalf.com>
Reviewed-by: Dawid Gorecki <dgr@semihalf.com>
Reviewed-by: Shai Brandes <shaibran@amazon.com>
---
 drivers/net/ena/ena_ethdev.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/net/ena/ena_ethdev.c b/drivers/net/ena/ena_ethdev.c
index 4bb2b195b1..02b4144388 100644
--- a/drivers/net/ena/ena_ethdev.c
+++ b/drivers/net/ena/ena_ethdev.c
@@ -624,6 +624,8 @@  static inline void ena_tx_mbuf_prepare(struct rte_mbuf *mbuf,
 
 		if (mbuf->ol_flags & RTE_MBUF_F_TX_IPV6) {
 			ena_tx_ctx->l3_proto = ENA_ETH_IO_L3_PROTO_IPV6;
+			/* For the IPv6 packets, DF always needs to be true. */
+			ena_tx_ctx->df = 1;
 		} else {
 			ena_tx_ctx->l3_proto = ENA_ETH_IO_L3_PROTO_IPV4;
 
@@ -631,7 +633,7 @@  static inline void ena_tx_mbuf_prepare(struct rte_mbuf *mbuf,
 			if (mbuf->packet_type &
 				(RTE_PTYPE_L4_NONFRAG
 				 | RTE_PTYPE_INNER_L4_NONFRAG))
-				ena_tx_ctx->df = true;
+				ena_tx_ctx->df = 1;
 		}
 
 		/* check if L4 checksum is needed */