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ixgbe: protect ring accesses with READ- and WRITE_ONCE

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READ_ONCE should be used when reading rings prior to accessing the
statistics pointer. Introduce this as well as the corresponding WRITE_ONCE
usage when allocating and freeing the rings, to ensure protected access.

Signed-off-by: Ciara Loftus <ciara.loftus@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Ciara Loftus
2020-06-09 13:19:43 +00:00
committed by Jeff Kirsher
parent 0ad6f6e767
commit f140ad9fe2
2 changed files with 17 additions and 9 deletions
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14
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
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@@ -7051,7 +7051,10 @@ void ixgbe_update_stats(struct ixgbe_adapter *adapter)
}
for (i = 0; i < adapter->num_rx_queues; i++) {
struct ixgbe_ring *rx_ring = adapter->rx_ring[i];
struct ixgbe_ring *rx_ring = READ_ONCE(adapter->rx_ring[i]);
if (!rx_ring)
continue;
non_eop_descs += rx_ring->rx_stats.non_eop_descs;
alloc_rx_page += rx_ring->rx_stats.alloc_rx_page;
alloc_rx_page_failed += rx_ring->rx_stats.alloc_rx_page_failed;
@@ -7072,15 +7075,20 @@ void ixgbe_update_stats(struct ixgbe_adapter *adapter)
packets = 0;
/* gather some stats to the adapter struct that are per queue */
for (i = 0; i < adapter->num_tx_queues; i++) {
struct ixgbe_ring *tx_ring = adapter->tx_ring[i];
struct ixgbe_ring *tx_ring = READ_ONCE(adapter->tx_ring[i]);
if (!tx_ring)
continue;
restart_queue += tx_ring->tx_stats.restart_queue;
tx_busy += tx_ring->tx_stats.tx_busy;
bytes += tx_ring->stats.bytes;
packets += tx_ring->stats.packets;
}
for (i = 0; i < adapter->num_xdp_queues; i++) {
struct ixgbe_ring *xdp_ring = adapter->xdp_ring[i];
struct ixgbe_ring *xdp_ring = READ_ONCE(adapter->xdp_ring[i]);
if (!xdp_ring)
continue;
restart_queue += xdp_ring->tx_stats.restart_queue;
tx_busy += xdp_ring->tx_stats.tx_busy;
bytes += xdp_ring->stats.bytes;