* [dpdk-stable] [PATCH] net/ena: fix L4 cksum flags condition for TX
@ 2019-08-01 11:45 Maciej Bielski
2019-08-01 12:08 ` Michał Krawczyk
0 siblings, 1 reply; 3+ messages in thread
From: Maciej Bielski @ 2019-08-01 11:45 UTC (permalink / raw)
To: dev
Cc: Maciej Bielski, Michal Krawczyk, Marcin Wojtas, Guy Tzalik,
Evgeny Schemeilin, Eduard Serra, igorc.mail, stable
During an if-condition evaluation, a 2-bit flag evaluates to 'true' for
'0x1', '0x2' and '0x3'. Thus, from this perspective these flags are
indistinguishable. To make them distinct, respective bits must be
extracted with a mask and then checked for strict equality.
Specifically here, even if `PKT_TX_UDP_CKSUM` (value '0x3') was set, the
expression `mbuf->ol_flags & PKT_TX_TCP` (the second flag of value
'0x1') is evaluated first and the result is 'true'. In consequence, for
UDP packets the execution flow enters an incorrect branch.
Fixes: 56b8b9b7e5d2 (net/ena: convert to new Tx offloads API)
Cc: stable@dpdk.org
Signed-off-by: Maciej Bielski <mba@semihalf.com>
Reported-by: Eduard Serra <eduser25@gmail.com>
---
drivers/net/ena/ena_ethdev.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ena/ena_ethdev.c b/drivers/net/ena/ena_ethdev.c
index f58334080..eb9d643f0 100644
--- a/drivers/net/ena/ena_ethdev.c
+++ b/drivers/net/ena/ena_ethdev.c
@@ -330,12 +330,13 @@ static inline void ena_tx_mbuf_prepare(struct rte_mbuf *mbuf,
}
/* check if L4 checksum is needed */
- if ((mbuf->ol_flags & PKT_TX_TCP_CKSUM) &&
+ if (((mbuf->ol_flags & PKT_TX_L4_MASK) == PKT_TX_TCP_CKSUM) &&
(queue_offloads & DEV_TX_OFFLOAD_TCP_CKSUM)) {
ena_tx_ctx->l4_proto = ENA_ETH_IO_L4_PROTO_TCP;
ena_tx_ctx->l4_csum_enable = true;
- } else if ((mbuf->ol_flags & PKT_TX_UDP_CKSUM) &&
- (queue_offloads & DEV_TX_OFFLOAD_UDP_CKSUM)) {
+ } else if (((mbuf->ol_flags & PKT_TX_L4_MASK) ==
+ PKT_TX_UDP_CKSUM) &&
+ (queue_offloads & DEV_TX_OFFLOAD_UDP_CKSUM)) {
ena_tx_ctx->l4_proto = ENA_ETH_IO_L4_PROTO_UDP;
ena_tx_ctx->l4_csum_enable = true;
} else {
--
2.20.1
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [dpdk-stable] [PATCH] net/ena: fix L4 cksum flags condition for TX
2019-08-01 11:45 [dpdk-stable] [PATCH] net/ena: fix L4 cksum flags condition for TX Maciej Bielski
@ 2019-08-01 12:08 ` Michał Krawczyk
2019-08-05 17:44 ` Thomas Monjalon
0 siblings, 1 reply; 3+ messages in thread
From: Michał Krawczyk @ 2019-08-01 12:08 UTC (permalink / raw)
To: Maciej Bielski
Cc: dev, Marcin Wojtas, Guy Tzalik, Evgeny Schemeilin, Eduard Serra,
igorc.mail, stable
czw., 1 sie 2019 o 13:45 Maciej Bielski <mba@semihalf.com> napisał(a):
>
> During an if-condition evaluation, a 2-bit flag evaluates to 'true' for
> '0x1', '0x2' and '0x3'. Thus, from this perspective these flags are
> indistinguishable. To make them distinct, respective bits must be
> extracted with a mask and then checked for strict equality.
>
> Specifically here, even if `PKT_TX_UDP_CKSUM` (value '0x3') was set, the
> expression `mbuf->ol_flags & PKT_TX_TCP` (the second flag of value
> '0x1') is evaluated first and the result is 'true'. In consequence, for
> UDP packets the execution flow enters an incorrect branch.
>
> Fixes: 56b8b9b7e5d2 (net/ena: convert to new Tx offloads API)
> Cc: stable@dpdk.org
>
> Signed-off-by: Maciej Bielski <mba@semihalf.com>
> Reported-by: Eduard Serra <eduser25@gmail.com>
Acked-by: Michal Krawczyk <mk@semihalf.com>
> ---
> drivers/net/ena/ena_ethdev.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/ena/ena_ethdev.c b/drivers/net/ena/ena_ethdev.c
> index f58334080..eb9d643f0 100644
> --- a/drivers/net/ena/ena_ethdev.c
> +++ b/drivers/net/ena/ena_ethdev.c
> @@ -330,12 +330,13 @@ static inline void ena_tx_mbuf_prepare(struct rte_mbuf *mbuf,
> }
>
> /* check if L4 checksum is needed */
> - if ((mbuf->ol_flags & PKT_TX_TCP_CKSUM) &&
> + if (((mbuf->ol_flags & PKT_TX_L4_MASK) == PKT_TX_TCP_CKSUM) &&
> (queue_offloads & DEV_TX_OFFLOAD_TCP_CKSUM)) {
> ena_tx_ctx->l4_proto = ENA_ETH_IO_L4_PROTO_TCP;
> ena_tx_ctx->l4_csum_enable = true;
> - } else if ((mbuf->ol_flags & PKT_TX_UDP_CKSUM) &&
> - (queue_offloads & DEV_TX_OFFLOAD_UDP_CKSUM)) {
> + } else if (((mbuf->ol_flags & PKT_TX_L4_MASK) ==
> + PKT_TX_UDP_CKSUM) &&
> + (queue_offloads & DEV_TX_OFFLOAD_UDP_CKSUM)) {
> ena_tx_ctx->l4_proto = ENA_ETH_IO_L4_PROTO_UDP;
> ena_tx_ctx->l4_csum_enable = true;
> } else {
> --
> 2.20.1
>
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [dpdk-stable] [PATCH] net/ena: fix L4 cksum flags condition for TX
2019-08-01 12:08 ` Michał Krawczyk
@ 2019-08-05 17:44 ` Thomas Monjalon
0 siblings, 0 replies; 3+ messages in thread
From: Thomas Monjalon @ 2019-08-05 17:44 UTC (permalink / raw)
To: Michał Krawczyk
Cc: stable, Maciej Bielski, dev, Marcin Wojtas, Guy Tzalik,
Evgeny Schemeilin, Eduard Serra, igorc.mail
01/08/2019 14:08, Michał Krawczyk:
> czw., 1 sie 2019 o 13:45 Maciej Bielski <mba@semihalf.com> napisał(a):
> >
> > During an if-condition evaluation, a 2-bit flag evaluates to 'true' for
> > '0x1', '0x2' and '0x3'. Thus, from this perspective these flags are
> > indistinguishable. To make them distinct, respective bits must be
> > extracted with a mask and then checked for strict equality.
> >
> > Specifically here, even if `PKT_TX_UDP_CKSUM` (value '0x3') was set, the
> > expression `mbuf->ol_flags & PKT_TX_TCP` (the second flag of value
> > '0x1') is evaluated first and the result is 'true'. In consequence, for
> > UDP packets the execution flow enters an incorrect branch.
> >
> > Fixes: 56b8b9b7e5d2 (net/ena: convert to new Tx offloads API)
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Maciej Bielski <mba@semihalf.com>
> > Reported-by: Eduard Serra <eduser25@gmail.com>
> Acked-by: Michal Krawczyk <mk@semihalf.com>
Applied, thanks
^ permalink raw reply [flat|nested] 3+ messages in thread
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2019-08-01 11:45 [dpdk-stable] [PATCH] net/ena: fix L4 cksum flags condition for TX Maciej Bielski
2019-08-01 12:08 ` Michał Krawczyk
2019-08-05 17:44 ` Thomas Monjalon
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