This is a note to let you know that I've just added the patch titled
igb: Always call igb_xdp_ring_update_tail() under Tx lock
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
igb-always-call-igb_xdp_ring_update_tail-under-tx-lo.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit bf15bb23b6d26981ff5d5347452bf88b602776e1
Author: Sriram Yagnaraman <sriram.yagnaraman@xxxxxxxxxxxx>
Date: Thu Aug 22 09:42:07 2024 +0200
igb: Always call igb_xdp_ring_update_tail() under Tx lock
[ Upstream commit 27717f8b17c098c4373ddb8fe89e1a1899c7779d ]
Always call igb_xdp_ring_update_tail() under __netif_tx_lock, add a comment
and lockdep assert to indicate that. This is needed to share the same TX
ring between XDP, XSK and slow paths. Furthermore, the current XDP
implementation is racy on tail updates.
Fixes: 9cbc948b5a20 ("igb: add XDP support")
Signed-off-by: Sriram Yagnaraman <sriram.yagnaraman@xxxxxxxx>
[Kurt: Add lockdep assert and fixes tag]
Signed-off-by: Kurt Kanzenbach <kurt@xxxxxxxxxxxxx>
Acked-by: Maciej Fijalkowski <maciej.fijalkowski@xxxxxxxxx>
Tested-by: George Kuruvinakunnel <george.kuruvinakunnel@xxxxxxxxx>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 76bd41058f3a..f2f719a952f8 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -34,6 +34,7 @@
#include <linux/bpf_trace.h>
#include <linux/pm_runtime.h>
#include <linux/etherdevice.h>
+#include <linux/lockdep.h>
#ifdef CONFIG_IGB_DCA
#include <linux/dca.h>
#endif
@@ -2915,8 +2916,11 @@ static int igb_xdp(struct net_device *dev, struct netdev_bpf *xdp)
}
}
+/* This function assumes __netif_tx_lock is held by the caller. */
static void igb_xdp_ring_update_tail(struct igb_ring *ring)
{
+ lockdep_assert_held(&txring_txq(ring)->_xmit_lock);
+
/* Force memory writes to complete before letting h/w know there
* are new descriptors to fetch.
*/
@@ -3001,11 +3005,11 @@ static int igb_xdp_xmit(struct net_device *dev, int n,
nxmit++;
}
- __netif_tx_unlock(nq);
-
if (unlikely(flags & XDP_XMIT_FLUSH))
igb_xdp_ring_update_tail(tx_ring);
+ __netif_tx_unlock(nq);
+
return nxmit;
}
@@ -8829,12 +8833,14 @@ static void igb_put_rx_buffer(struct igb_ring *rx_ring,
static int igb_clean_rx_irq(struct igb_q_vector *q_vector, const int budget)
{
+ unsigned int total_bytes = 0, total_packets = 0;
struct igb_adapter *adapter = q_vector->adapter;
struct igb_ring *rx_ring = q_vector->rx.ring;
- struct sk_buff *skb = rx_ring->skb;
- unsigned int total_bytes = 0, total_packets = 0;
u16 cleaned_count = igb_desc_unused(rx_ring);
+ struct sk_buff *skb = rx_ring->skb;
+ int cpu = smp_processor_id();
unsigned int xdp_xmit = 0;
+ struct netdev_queue *nq;
struct xdp_buff xdp;
u32 frame_sz = 0;
int rx_buf_pgcnt;
@@ -8962,7 +8968,10 @@ static int igb_clean_rx_irq(struct igb_q_vector *q_vector, const int budget)
if (xdp_xmit & IGB_XDP_TX) {
struct igb_ring *tx_ring = igb_xdp_tx_queue_mapping(adapter);
+ nq = txring_txq(tx_ring);
+ __netif_tx_lock(nq, cpu);
igb_xdp_ring_update_tail(tx_ring);
+ __netif_tx_unlock(nq);
}
u64_stats_update_begin(&rx_ring->rx_syncp);
