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From: Larysa Zaremba <larysa.zaremba@intel.com>
To: "David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Eric Dumazet <edumazet@google.com>,
	Paolo Abeni <pabeni@redhat.com>
Cc: Larysa Zaremba <larysa.zaremba@intel.com>,
	intel-wired-lan@osuosl.org, netdev@vger.kernel.org,
	bpf@vger.kernel.org,
	Alexander Lobakin <alexandr.lobakin@intel.com>,
	Tony Nguyen <anthony.l.nguyen@intel.com>,
	Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Subject: [PATCH net] ice: xsk: Fix cleaning of XDP_TX frames
Date: Thu,  9 Feb 2023 17:01:30 +0100	[thread overview]
Message-ID: <20230209160130.1779890-1-larysa.zaremba@intel.com> (raw)

Incrementation of xsk_frames inside the for-loop produces
infinite loop, if we have both normal AF_XDP-TX and XDP_TXed
buffers to complete.

Split xsk_frames into 2 variables (xsk_frames and completed_frames)
to eliminate this bug.

Fixes: 29322791bc8b ("ice: xsk: change batched Tx descriptor cleaning")
Acked-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
To Tony: this is urgent and should go directly via net. It's tested and acked.
---
 drivers/net/ethernet/intel/ice/ice_xsk.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
index 7105de6fb344..374b7f10b549 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -800,6 +800,7 @@ static void ice_clean_xdp_irq_zc(struct ice_tx_ring *xdp_ring)
 	struct ice_tx_desc *tx_desc;
 	u16 cnt = xdp_ring->count;
 	struct ice_tx_buf *tx_buf;
+	u16 completed_frames = 0;
 	u16 xsk_frames = 0;
 	u16 last_rs;
 	int i;
@@ -809,19 +810,21 @@ static void ice_clean_xdp_irq_zc(struct ice_tx_ring *xdp_ring)
 	if ((tx_desc->cmd_type_offset_bsz &
 	    cpu_to_le64(ICE_TX_DESC_DTYPE_DESC_DONE))) {
 		if (last_rs >= ntc)
-			xsk_frames = last_rs - ntc + 1;
+			completed_frames = last_rs - ntc + 1;
 		else
-			xsk_frames = last_rs + cnt - ntc + 1;
+			completed_frames = last_rs + cnt - ntc + 1;
 	}
 
-	if (!xsk_frames)
+	if (!completed_frames)
 		return;
 
-	if (likely(!xdp_ring->xdp_tx_active))
+	if (likely(!xdp_ring->xdp_tx_active)) {
+		xsk_frames = completed_frames;
 		goto skip;
+	}
 
 	ntc = xdp_ring->next_to_clean;
-	for (i = 0; i < xsk_frames; i++) {
+	for (i = 0; i < completed_frames; i++) {
 		tx_buf = &xdp_ring->tx_buf[ntc];
 
 		if (tx_buf->raw_buf) {
@@ -837,7 +840,7 @@ static void ice_clean_xdp_irq_zc(struct ice_tx_ring *xdp_ring)
 	}
 skip:
 	tx_desc->cmd_type_offset_bsz = 0;
-	xdp_ring->next_to_clean += xsk_frames;
+	xdp_ring->next_to_clean += completed_frames;
 	if (xdp_ring->next_to_clean >= cnt)
 		xdp_ring->next_to_clean -= cnt;
 	if (xsk_frames)
-- 
2.35.3


WARNING: multiple messages have this Message-ID (diff)
From: Larysa Zaremba <larysa.zaremba@intel.com>
To: "David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Eric Dumazet <edumazet@google.com>,
	Paolo Abeni <pabeni@redhat.com>
Cc: Larysa Zaremba <larysa.zaremba@intel.com>,
	intel-wired-lan@osuosl.org,
	Tony Nguyen <anthony.l.nguyen@intel.com>,
	netdev@vger.kernel.org, bpf@vger.kernel.org
Subject: [Intel-wired-lan] [PATCH net] ice: xsk: Fix cleaning of XDP_TX frames
Date: Thu,  9 Feb 2023 17:01:30 +0100	[thread overview]
Message-ID: <20230209160130.1779890-1-larysa.zaremba@intel.com> (raw)

Incrementation of xsk_frames inside the for-loop produces
infinite loop, if we have both normal AF_XDP-TX and XDP_TXed
buffers to complete.

Split xsk_frames into 2 variables (xsk_frames and completed_frames)
to eliminate this bug.

Fixes: 29322791bc8b ("ice: xsk: change batched Tx descriptor cleaning")
Acked-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
To Tony: this is urgent and should go directly via net. It's tested and acked.
---
 drivers/net/ethernet/intel/ice/ice_xsk.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
index 7105de6fb344..374b7f10b549 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -800,6 +800,7 @@ static void ice_clean_xdp_irq_zc(struct ice_tx_ring *xdp_ring)
 	struct ice_tx_desc *tx_desc;
 	u16 cnt = xdp_ring->count;
 	struct ice_tx_buf *tx_buf;
+	u16 completed_frames = 0;
 	u16 xsk_frames = 0;
 	u16 last_rs;
 	int i;
@@ -809,19 +810,21 @@ static void ice_clean_xdp_irq_zc(struct ice_tx_ring *xdp_ring)
 	if ((tx_desc->cmd_type_offset_bsz &
 	    cpu_to_le64(ICE_TX_DESC_DTYPE_DESC_DONE))) {
 		if (last_rs >= ntc)
-			xsk_frames = last_rs - ntc + 1;
+			completed_frames = last_rs - ntc + 1;
 		else
-			xsk_frames = last_rs + cnt - ntc + 1;
+			completed_frames = last_rs + cnt - ntc + 1;
 	}
 
-	if (!xsk_frames)
+	if (!completed_frames)
 		return;
 
-	if (likely(!xdp_ring->xdp_tx_active))
+	if (likely(!xdp_ring->xdp_tx_active)) {
+		xsk_frames = completed_frames;
 		goto skip;
+	}
 
 	ntc = xdp_ring->next_to_clean;
-	for (i = 0; i < xsk_frames; i++) {
+	for (i = 0; i < completed_frames; i++) {
 		tx_buf = &xdp_ring->tx_buf[ntc];
 
 		if (tx_buf->raw_buf) {
@@ -837,7 +840,7 @@ static void ice_clean_xdp_irq_zc(struct ice_tx_ring *xdp_ring)
 	}
 skip:
 	tx_desc->cmd_type_offset_bsz = 0;
-	xdp_ring->next_to_clean += xsk_frames;
+	xdp_ring->next_to_clean += completed_frames;
 	if (xdp_ring->next_to_clean >= cnt)
 		xdp_ring->next_to_clean -= cnt;
 	if (xsk_frames)
-- 
2.35.3

_______________________________________________
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             reply	other threads:[~2023-02-09 16:19 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-02-09 16:01 Larysa Zaremba [this message]
2023-02-09 16:01 ` [Intel-wired-lan] [PATCH net] ice: xsk: Fix cleaning of XDP_TX frames Larysa Zaremba
2023-02-09 17:07 ` Alexander H Duyck
2023-02-09 17:07   ` [Intel-wired-lan] " Alexander H Duyck
2023-02-09 17:20 ` Tony Nguyen
2023-02-09 17:20   ` [Intel-wired-lan] " Tony Nguyen
2023-02-09 18:00   ` Jakub Kicinski
2023-02-09 18:00     ` [Intel-wired-lan] " Jakub Kicinski
2023-02-11  4:00 ` patchwork-bot+netdevbpf
2023-02-11  4:00   ` [Intel-wired-lan] " patchwork-bot+netdevbpf

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