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cxgb4: Fix race between loopback and normal Tx path 

Even after Tx queues are marked stopped, there exists a
small window where the current packet in the normal Tx
path is still being sent out and loopback selftest ends
up corrupting the same Tx ring. So, ensure selftest takes
the Tx lock to synchronize access the Tx ring.

Fixes: 7235ffae3d ("cxgb4: add loopback ethtool self-test")
Signed-off-by: Ganji Aravind <ganji.aravind@chelsio.com>
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ganji Aravind 2020-08-18 21:10:58 +05:30 committed by David S. Miller
parent 335956421c
commit c650e04898
1 changed files with 5 additions and 1 deletions
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6
drivers/net/ethernet/chelsio/cxgb4/sge.c
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@ -2561,11 +2561,14 @@ int cxgb4_selftest_lb_pkt(struct net_device *netdev)
lb->loopback = 1;
q = &adap->sge.ethtxq[pi->first_qset];
__netif_tx_lock(q->txq, smp_processor_id());
reclaim_completed_tx(adap, &q->q, -1, true);
credits = txq_avail(&q->q) - ndesc;
if (unlikely(credits < 0))
if (unlikely(credits < 0)) {
__netif_tx_unlock(q->txq);
return -ENOMEM;
}
wr = (void *)&q->q.desc[q->q.pidx];
memset(wr, 0, sizeof(struct tx_desc));
@ -2598,6 +2601,7 @@ int cxgb4_selftest_lb_pkt(struct net_device *netdev)
init_completion(&lb->completion);
txq_advance(&q->q, ndesc);
cxgb4_ring_tx_db(adap, &q->q, ndesc);
__netif_tx_unlock(q->txq);
/* wait for the pkt to return */
ret = wait_for_completion_timeout(&lb->completion, 10 * HZ);