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bnxt_en: Prevent XDP redirect from running when stopping TX queue

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Add checks in the XDP redirect callback to prevent XDP from running when
the TX ring is undergoing shutdown.

Also remove redundant checks in the XDP redirect callback to validate the
txr and the flag that indicates the ring supports XDP. The modulo
arithmetic on 'tx_nr_rings_xdp' already guarantees the derived TX
ring is an XDP ring.  txr is also guaranteed to be valid after checking
BNXT_STATE_OPEN and within RCU grace period.

Fixes: f18c2b77b2 ("bnxt_en: optimized XDP_REDIRECT support")
Reviewed-by: Vladimir Olovyannikov <vladimir.olovyannikov@broadcom.com>
Signed-off-by: Ray Jui <ray.jui@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ray Jui 2022-04-01 20:21:12 -04:00 committed by David S. Miller
parent facc173cf7
commit 27d4073f8d
1 changed files with 4 additions and 2 deletions
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6
drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
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@ -229,14 +229,16 @@ int bnxt_xdp_xmit(struct net_device *dev, int num_frames,
ring = smp_processor_id() % bp->tx_nr_rings_xdp;
txr = &bp->tx_ring[ring];
if (READ_ONCE(txr->dev_state) == BNXT_DEV_STATE_CLOSING)
return -EINVAL;
if (static_branch_unlikely(&bnxt_xdp_locking_key))
spin_lock(&txr->xdp_tx_lock);
for (i = 0; i < num_frames; i++) {
struct xdp_frame *xdp = frames[i];
if (!txr || !bnxt_tx_avail(bp, txr) ||
!(bp->bnapi[ring]->flags & BNXT_NAPI_FLAG_XDP))
if (!bnxt_tx_avail(bp, txr))
break;
mapping = dma_map_single(&pdev->dev, xdp->data, xdp->len,