This is a note to let you know that I've just added the patch titled
net/mlx4_en: Wake TX queues only when there's enough room
to the 4.0-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:
net-mlx4_en-wake-tx-queues-only-when-there-s-enough-room.patch
and it can be found in the queue-4.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Fri Jul 3 19:59:52 PDT 2015
From: Ido Shamay <idos@xxxxxxxxxxxx>
Date: Thu, 25 Jun 2015 11:29:42 +0300
Subject: net/mlx4_en: Wake TX queues only when there's enough room
From: Ido Shamay <idos@xxxxxxxxxxxx>
[ Upstream commit 488a9b48e398b157703766e2cd91ea45ac6997c5 ]
Indication of a single completed packet, marked by txbbs_skipped
being bigger then zero, in not enough in order to wake up a
stopped TX queue. The completed packet may contain a single TXBB,
while next packet to be sent (after the wake up) may have multiple
TXBBs (LSO/TSO packets for example), causing overflow in queue followed
by WQE corruption and TX queue timeout.
Instead, wake the stopped queue only when there's enough room for the
worst case (maximum sized WQE) packet that we should need to handle after
the queue is opened again.
Also created an helper routine - mlx4_en_is_tx_ring_full, which checks
if the current TX ring is full or not. It provides better code readability
and removes code duplication.
Signed-off-by: Ido Shamay <idos@xxxxxxxxxxxx>
Signed-off-by: Or Gerlitz <ogerlitz@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/mellanox/mlx4/en_tx.c | 19 +++++++++++--------
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 1 +
2 files changed, 12 insertions(+), 8 deletions(-)
--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
@@ -66,6 +66,7 @@ int mlx4_en_create_tx_ring(struct mlx4_e
ring->size = size;
ring->size_mask = size - 1;
ring->stride = stride;
+ ring->full_size = ring->size - HEADROOM - MAX_DESC_TXBBS;
tmp = size * sizeof(struct mlx4_en_tx_info);
ring->tx_info = kmalloc_node(tmp, GFP_KERNEL | __GFP_NOWARN, node);
@@ -232,6 +233,11 @@ void mlx4_en_deactivate_tx_ring(struct m
MLX4_QP_STATE_RST, NULL, 0, 0, &ring->qp);
}
+static inline bool mlx4_en_is_tx_ring_full(struct mlx4_en_tx_ring *ring)
+{
+ return ring->prod - ring->cons > ring->full_size;
+}
+
static void mlx4_en_stamp_wqe(struct mlx4_en_priv *priv,
struct mlx4_en_tx_ring *ring, int index,
u8 owner)
@@ -474,11 +480,10 @@ static bool mlx4_en_process_tx_cq(struct
netdev_tx_completed_queue(ring->tx_queue, packets, bytes);
- /*
- * Wakeup Tx queue if this stopped, and at least 1 packet
- * was completed
+ /* Wakeup Tx queue if this stopped, and ring is not full.
*/
- if (netif_tx_queue_stopped(ring->tx_queue) && txbbs_skipped > 0) {
+ if (netif_tx_queue_stopped(ring->tx_queue) &&
+ !mlx4_en_is_tx_ring_full(ring)) {
netif_tx_wake_queue(ring->tx_queue);
ring->wake_queue++;
}
@@ -922,8 +927,7 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff
skb_tx_timestamp(skb);
/* Check available TXBBs And 2K spare for prefetch */
- stop_queue = (int)(ring->prod - ring_cons) >
- ring->size - HEADROOM - MAX_DESC_TXBBS;
+ stop_queue = mlx4_en_is_tx_ring_full(ring);
if (unlikely(stop_queue)) {
netif_tx_stop_queue(ring->tx_queue);
ring->queue_stopped++;
@@ -992,8 +996,7 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff
smp_rmb();
ring_cons = ACCESS_ONCE(ring->cons);
- if (unlikely(((int)(ring->prod - ring_cons)) <=
- ring->size - HEADROOM - MAX_DESC_TXBBS)) {
+ if (unlikely(!mlx4_en_is_tx_ring_full(ring))) {
netif_tx_wake_queue(ring->tx_queue);
ring->wake_queue++;
}
--- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
+++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
@@ -280,6 +280,7 @@ struct mlx4_en_tx_ring {
u32 size; /* number of TXBBs */
u32 size_mask;
u16 stride;
+ u32 full_size;
u16 cqn; /* index of port CQ associated with this ring */
u32 buf_size;
__be32 doorbell_qpn;
Patches currently in stable-queue which might be from idos@xxxxxxxxxxxx are
queue-4.0/net-mlx4_en-wake-tx-queues-only-when-there-s-enough-room.patch
queue-4.0/net-mlx4_en-fix-wrong-csum-complete-report-when-rxvlan-offload-is-disabled.patch
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