* [PATCH net] i40e: sync next_to_clean and next_to_process for programming status desc
@ 2023-10-04 8:34 Tirthendu Sarkar
2023-10-04 13:16 ` Maciej Fijalkowski
2023-10-13 9:57 ` [Intel-wired-lan] " Arland, ArpanaX
0 siblings, 2 replies; 3+ messages in thread
From: Tirthendu Sarkar @ 2023-10-04 8:34 UTC (permalink / raw)
To: intel-wired-lan
Cc: jesse.brandeburg, anthony.l.nguyen, netdev, bpf, magnus.karlsson,
maciej.fijalkowski
When a programming status desc is encountered on the rx_ring,
next_to_process is bumped along with cleaned_count but next_to_clean is
not. This causes I40E_DESC_UNUSED() macro to misbehave resulting in
overwriting whole ring with new buffers.
Update next_to_clean to point to next_to_process on seeing a programming
status desc if not in the middle of handling a multi-frag packet. Also,
bump cleaned_count only for such case as otherwise next_to_clean buffer
may be returned to hardware on reaching clean_threshold.
Fixes: e9031f2da1ae ("i40e: introduce next_to_process to i40e_ring")
Suggested-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Reported-by: hq.dev+kernel@msdfc.xyz
Reported by: Solomon Peachy <pizza@shaftnet.org>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217678
Tested-by: hq.dev+kernel@msdfc.xyz
Tested by: Indrek Järve <incx@dustbite.net>
Signed-off-by: Tirthendu Sarkar <tirthendu.sarkar@intel.com>
---
drivers/net/ethernet/intel/i40e/i40e_txrx.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index 0b3a27f118fb..50c70a8e470a 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -2544,7 +2544,14 @@ static int i40e_clean_rx_irq(struct i40e_ring *rx_ring, int budget,
rx_buffer = i40e_rx_bi(rx_ring, ntp);
i40e_inc_ntp(rx_ring);
i40e_reuse_rx_page(rx_ring, rx_buffer);
- cleaned_count++;
+ /* Update ntc and bump cleaned count if not in the
+ * middle of mb packet.
+ */
+ if (rx_ring->next_to_clean == ntp) {
+ rx_ring->next_to_clean =
+ rx_ring->next_to_process;
+ cleaned_count++;
+ }
continue;
}
--
2.34.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH net] i40e: sync next_to_clean and next_to_process for programming status desc
2023-10-04 8:34 [PATCH net] i40e: sync next_to_clean and next_to_process for programming status desc Tirthendu Sarkar
@ 2023-10-04 13:16 ` Maciej Fijalkowski
2023-10-13 9:57 ` [Intel-wired-lan] " Arland, ArpanaX
1 sibling, 0 replies; 3+ messages in thread
From: Maciej Fijalkowski @ 2023-10-04 13:16 UTC (permalink / raw)
To: Tirthendu Sarkar
Cc: intel-wired-lan, jesse.brandeburg, anthony.l.nguyen, netdev, bpf,
magnus.karlsson
On Wed, Oct 04, 2023 at 02:04:54PM +0530, Tirthendu Sarkar wrote:
> When a programming status desc is encountered on the rx_ring,
> next_to_process is bumped along with cleaned_count but next_to_clean is
> not. This causes I40E_DESC_UNUSED() macro to misbehave resulting in
> overwriting whole ring with new buffers.
>
> Update next_to_clean to point to next_to_process on seeing a programming
> status desc if not in the middle of handling a multi-frag packet. Also,
> bump cleaned_count only for such case as otherwise next_to_clean buffer
> may be returned to hardware on reaching clean_threshold.
>
> Fixes: e9031f2da1ae ("i40e: introduce next_to_process to i40e_ring")
> Suggested-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
> Reported-by: hq.dev+kernel@msdfc.xyz
> Reported by: Solomon Peachy <pizza@shaftnet.org>
> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217678
> Tested-by: hq.dev+kernel@msdfc.xyz
Could you ask for a name of that someone?
> Tested by: Indrek Järve <incx@dustbite.net>
> Signed-off-by: Tirthendu Sarkar <tirthendu.sarkar@intel.com>
Acked-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
> ---
> drivers/net/ethernet/intel/i40e/i40e_txrx.c | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
> index 0b3a27f118fb..50c70a8e470a 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
> @@ -2544,7 +2544,14 @@ static int i40e_clean_rx_irq(struct i40e_ring *rx_ring, int budget,
> rx_buffer = i40e_rx_bi(rx_ring, ntp);
> i40e_inc_ntp(rx_ring);
> i40e_reuse_rx_page(rx_ring, rx_buffer);
> - cleaned_count++;
> + /* Update ntc and bump cleaned count if not in the
> + * middle of mb packet.
> + */
> + if (rx_ring->next_to_clean == ntp) {
> + rx_ring->next_to_clean =
> + rx_ring->next_to_process;
> + cleaned_count++;
> + }
> continue;
> }
>
> --
> 2.34.1
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* RE: [Intel-wired-lan] [PATCH net] i40e: sync next_to_clean and next_to_process for programming status desc
2023-10-04 8:34 [PATCH net] i40e: sync next_to_clean and next_to_process for programming status desc Tirthendu Sarkar
2023-10-04 13:16 ` Maciej Fijalkowski
@ 2023-10-13 9:57 ` Arland, ArpanaX
1 sibling, 0 replies; 3+ messages in thread
From: Arland, ArpanaX @ 2023-10-13 9:57 UTC (permalink / raw)
To: Sarkar, Tirthendu, intel-wired-lan
Cc: Fijalkowski, Maciej, netdev, Brandeburg, Jesse, Nguyen,
Anthony L, bpf, Karlsson, Magnus
> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of Tirthendu Sarkar
> Sent: Wednesday, October 4, 2023 2:05 PM
> To: intel-wired-lan@lists.osuosl.org
> Cc: Fijalkowski, Maciej <maciej.fijalkowski@intel.com>; netdev@vger.kernel.org; Brandeburg, Jesse <jesse.brandeburg@intel.com>; Nguyen, Anthony L <anthony.l.nguyen@intel.com>; bpf@vger.kernel.org; Karlsson, Magnus <magnus.karlsson@intel.com>
> Subject: [Intel-wired-lan] [PATCH net] i40e: sync next_to_clean and next_to_process for programming status desc
>
> When a programming status desc is encountered on the rx_ring, next_to_process is bumped along with cleaned_count but next_to_clean is not. This causes I40E_DESC_UNUSED() macro to misbehave resulting in overwriting whole ring with new buffers.
>
> Update next_to_clean to point to next_to_process on seeing a programming status desc if not in the middle of handling a multi-frag packet. Also, bump cleaned_count only for such case as otherwise next_to_clean buffer may be returned to hardware on reaching clean_threshold.
>
> Fixes: e9031f2da1ae ("i40e: introduce next_to_process to i40e_ring")
> Suggested-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
> Reported-by: hq.dev+kernel@msdfc.xyz
> Reported by: Solomon Peachy <pizza@shaftnet.org>
> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217678
> Tested-by: hq.dev+kernel@msdfc.xyz
> Tested by: Indrek Järve <incx@dustbite.net>
> Signed-off-by: Tirthendu Sarkar <tirthendu.sarkar@intel.com>
> ---
> drivers/net/ethernet/intel/i40e/i40e_txrx.c | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
Tested-by: Arpana Arland <arpanax.arland@intel.com> (A Contingent worker at Intel)
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2023-10-04 13:16 ` Maciej Fijalkowski
2023-10-13 9:57 ` [Intel-wired-lan] " Arland, ArpanaX
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