From: Stephane Graber <[email protected]>
All packets on ingress (except for jumbo) are terminated with a 4-bytes
CRC checksum. It's the responsability of the driver to strip those 4
bytes. Unfortunately a change dating back to March 2017 re-shuffled some
code and made the CRC stripping code effectively dead.
This change re-orders that part a bit such that the datalen is
immediately altered if needed.
Fixes: 4902a92270fb ("drivers: net: xgene: Add workaround for errata 10GE_8/ENET_11")
Signed-off-by: Stephane Graber <[email protected]>
Tested-by: Stephane Graber <[email protected]>
Cc: [email protected]
---
drivers/net/ethernet/apm/xgene/xgene_enet_main.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
index ff2d099aab21..3892790f04e0 100644
--- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
+++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
@@ -696,6 +696,12 @@ static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring,
buf_pool->rx_skb[skb_index] = NULL;
datalen = xgene_enet_get_data_len(le64_to_cpu(raw_desc->m1));
+
+ /* strip off CRC as HW isn't doing this */
+ nv = GET_VAL(NV, le64_to_cpu(raw_desc->m0));
+ if (!nv)
+ datalen -= 4;
+
skb_put(skb, datalen);
prefetch(skb->data - NET_IP_ALIGN);
skb->protocol = eth_type_trans(skb, ndev);
@@ -717,10 +723,7 @@ static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring,
}
}
- nv = GET_VAL(NV, le64_to_cpu(raw_desc->m0));
if (!nv) {
- /* strip off CRC as HW isn't doing this */
- datalen -= 4;
goto skip_jumbo;
}
--
2.34.1
On Thu, 17 Mar 2022 10:42:25 -0400 Stéphane Graber wrote:
> From: Stephane Graber <[email protected]>
>
> All packets on ingress (except for jumbo) are terminated with a 4-bytes
> CRC checksum. It's the responsability of the driver to strip those 4
> bytes. Unfortunately a change dating back to March 2017 re-shuffled some
> code and made the CRC stripping code effectively dead.
>
> This change re-orders that part a bit such that the datalen is
> immediately altered if needed.
>
> Fixes: 4902a92270fb ("drivers: net: xgene: Add workaround for errata 10GE_8/ENET_11")
> Signed-off-by: Stephane Graber <[email protected]>
> Tested-by: Stephane Graber <[email protected]>
> Cc: [email protected]
> ---
> drivers/net/ethernet/apm/xgene/xgene_enet_main.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
> index ff2d099aab21..3892790f04e0 100644
> --- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
> +++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
> @@ -696,6 +696,12 @@ static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring,
> buf_pool->rx_skb[skb_index] = NULL;
>
> datalen = xgene_enet_get_data_len(le64_to_cpu(raw_desc->m1));
> +
> + /* strip off CRC as HW isn't doing this */
> + nv = GET_VAL(NV, le64_to_cpu(raw_desc->m0));
> + if (!nv)
> + datalen -= 4;
Alternatively we could call skb_trim() below to remove the FCS.
You call, but..
> skb_put(skb, datalen);
> prefetch(skb->data - NET_IP_ALIGN);
> skb->protocol = eth_type_trans(skb, ndev);
> @@ -717,10 +723,7 @@ static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring,
> }
> }
>
> - nv = GET_VAL(NV, le64_to_cpu(raw_desc->m0));
> if (!nv) {
> - /* strip off CRC as HW isn't doing this */
> - datalen -= 4;
> goto skip_jumbo;
> }
If you stick to moving the datalen adjustments this if will have a
single statement so according to the kernel code style it has to lose
the brackets.
From: Stephane Graber <[email protected]>
All packets on ingress (except for jumbo) are terminated with a 4-bytes
CRC checksum. It's the responsability of the driver to strip those 4
bytes. Unfortunately a change dating back to March 2017 re-shuffled some
code and made the CRC stripping code effectively dead.
This change re-orders that part a bit such that the datalen is
immediately altered if needed.
Fixes: 4902a92270fb ("drivers: net: xgene: Add workaround for errata 10GE_8/ENET_11")
Signed-off-by: Stephane Graber <[email protected]>
Tested-by: Stephane Graber <[email protected]>
Cc: Jakub Kicinski <[email protected]>
Cc: [email protected]
---
drivers/net/ethernet/apm/xgene/xgene_enet_main.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
index ff2d099aab21..53dc8d5fede8 100644
--- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
+++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
@@ -696,6 +696,12 @@ static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring,
buf_pool->rx_skb[skb_index] = NULL;
datalen = xgene_enet_get_data_len(le64_to_cpu(raw_desc->m1));
+
+ /* strip off CRC as HW isn't doing this */
+ nv = GET_VAL(NV, le64_to_cpu(raw_desc->m0));
+ if (!nv)
+ datalen -= 4;
+
skb_put(skb, datalen);
prefetch(skb->data - NET_IP_ALIGN);
skb->protocol = eth_type_trans(skb, ndev);
@@ -717,12 +723,8 @@ static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring,
}
}
- nv = GET_VAL(NV, le64_to_cpu(raw_desc->m0));
- if (!nv) {
- /* strip off CRC as HW isn't doing this */
- datalen -= 4;
+ if (!nv)
goto skip_jumbo;
- }
slots = page_pool->slots - 1;
head = page_pool->head;
--
2.34.1
Hello:
This patch was applied to netdev/net-next.git (master)
by Jakub Kicinski <[email protected]>:
On Tue, 22 Mar 2022 18:42:06 -0400 you wrote:
> From: Stephane Graber <[email protected]>
>
> All packets on ingress (except for jumbo) are terminated with a 4-bytes
> CRC checksum. It's the responsability of the driver to strip those 4
> bytes. Unfortunately a change dating back to March 2017 re-shuffled some
> code and made the CRC stripping code effectively dead.
>
> [...]
Here is the summary with links:
- [v2] drivers: net: xgene: Fix regression in CRC stripping
https://git.kernel.org/netdev/net-next/c/e9e6faeafaa0
You are awesome, thank you!
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