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authorMagnus Karlsson <magnus.karlsson@intel.com>2019-08-14 09:27:18 +0200
committerDaniel Borkmann <daniel@iogearbox.net>2019-08-17 23:07:32 +0200
commit3d0c5f1cd268fdd7d2e75eaf3e0d2fe460ac748b (patch)
tree8ae090217ab850c860c48b014f3c98e69e8bf064
parent77cd0d7b3f257fd0e3096b4fdcff1a7d38e99e10 (diff)
i40e: add support for AF_XDP need_wakeup feature
This patch adds support for the need_wakeup feature of AF_XDP. If the application has told the kernel that it might sleep using the new bind flag XDP_USE_NEED_WAKEUP, the driver will then set this flag if it has no more buffers on the NIC Rx ring and yield to the application. For Tx, it will set the flag if it has no outstanding Tx completion interrupts and return to the application. Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com> Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
-rw-r--r--drivers/net/ethernet/intel/i40e/i40e_xsk.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
index d0ff5d8b297b..42c90126b6c4 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
@@ -626,6 +626,15 @@ int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget)
i40e_finalize_xdp_rx(rx_ring, xdp_xmit);
i40e_update_rx_stats(rx_ring, total_rx_bytes, total_rx_packets);
+
+ if (xsk_umem_uses_need_wakeup(rx_ring->xsk_umem)) {
+ if (failure || rx_ring->next_to_clean == rx_ring->next_to_use)
+ xsk_set_rx_need_wakeup(rx_ring->xsk_umem);
+ else
+ xsk_clear_rx_need_wakeup(rx_ring->xsk_umem);
+
+ return (int)total_rx_packets;
+ }
return failure ? budget : (int)total_rx_packets;
}
@@ -681,6 +690,8 @@ static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget)
i40e_xdp_ring_update_tail(xdp_ring);
xsk_umem_consume_tx_done(xdp_ring->xsk_umem);
+ if (xsk_umem_uses_need_wakeup(xdp_ring->xsk_umem))
+ xsk_clear_tx_need_wakeup(xdp_ring->xsk_umem);
}
return !!budget && work_done;
@@ -759,6 +770,13 @@ bool i40e_clean_xdp_tx_irq(struct i40e_vsi *vsi,
i40e_update_tx_stats(tx_ring, completed_frames, total_bytes);
out_xmit:
+ if (xsk_umem_uses_need_wakeup(tx_ring->xsk_umem)) {
+ if (tx_ring->next_to_clean == tx_ring->next_to_use)
+ xsk_set_tx_need_wakeup(tx_ring->xsk_umem);
+ else
+ xsk_clear_tx_need_wakeup(tx_ring->xsk_umem);
+ }
+
xmit_done = i40e_xmit_zc(tx_ring, budget);
return work_done && xmit_done;