4.17-stable review patch. If anyone has any objections, please let me know.
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From: Jesper Dangaard Brouer brouer@redhat.com
[ Upstream commit ad088ec480768850db019a5cc543685e868a513d ]
The driver was combining the XDP_TX tail flush and XDP_REDIRECT map flushing (xdp_do_flush_map). This is suboptimal, these two flush operations should be kept separate.
Fixes: 11393cc9b9be ("xdp: Add batching support to redirect map") Signed-off-by: Jesper Dangaard Brouer brouer@redhat.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 24 ++++++++++++++---------- 1 file changed, 14 insertions(+), 10 deletions(-)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c @@ -2257,9 +2257,10 @@ static struct sk_buff *ixgbe_build_skb(s return skb; }
-#define IXGBE_XDP_PASS 0 -#define IXGBE_XDP_CONSUMED 1 -#define IXGBE_XDP_TX 2 +#define IXGBE_XDP_PASS 0 +#define IXGBE_XDP_CONSUMED BIT(0) +#define IXGBE_XDP_TX BIT(1) +#define IXGBE_XDP_REDIR BIT(2)
static int ixgbe_xmit_xdp_ring(struct ixgbe_adapter *adapter, struct xdp_buff *xdp); @@ -2288,7 +2289,7 @@ static struct sk_buff *ixgbe_run_xdp(str case XDP_REDIRECT: err = xdp_do_redirect(adapter->netdev, xdp, xdp_prog); if (!err) - result = IXGBE_XDP_TX; + result = IXGBE_XDP_REDIR; else result = IXGBE_XDP_CONSUMED; break; @@ -2348,7 +2349,7 @@ static int ixgbe_clean_rx_irq(struct ixg unsigned int mss = 0; #endif /* IXGBE_FCOE */ u16 cleaned_count = ixgbe_desc_unused(rx_ring); - bool xdp_xmit = false; + unsigned int xdp_xmit = 0; struct xdp_buff xdp;
xdp.rxq = &rx_ring->xdp_rxq; @@ -2391,8 +2392,10 @@ static int ixgbe_clean_rx_irq(struct ixg }
if (IS_ERR(skb)) { - if (PTR_ERR(skb) == -IXGBE_XDP_TX) { - xdp_xmit = true; + unsigned int xdp_res = -PTR_ERR(skb); + + if (xdp_res & (IXGBE_XDP_TX | IXGBE_XDP_REDIR)) { + xdp_xmit |= xdp_res; ixgbe_rx_buffer_flip(rx_ring, rx_buffer, size); } else { rx_buffer->pagecnt_bias++; @@ -2464,7 +2467,10 @@ static int ixgbe_clean_rx_irq(struct ixg total_rx_packets++; }
- if (xdp_xmit) { + if (xdp_xmit & IXGBE_XDP_REDIR) + xdp_do_flush_map(); + + if (xdp_xmit & IXGBE_XDP_TX) { struct ixgbe_ring *ring = adapter->xdp_ring[smp_processor_id()];
/* Force memory writes to complete before letting h/w @@ -2472,8 +2478,6 @@ static int ixgbe_clean_rx_irq(struct ixg */ wmb(); writel(ring->next_to_use, ring->tail); - - xdp_do_flush_map(); }
u64_stats_update_begin(&rx_ring->syncp);