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tsnep: Fix XDP_RING_NEED_WAKEUP for empty fill ring

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[ Upstream commit 9a91c05f4b ]

The fill ring of the XDP socket may contain not enough buffers to
completey fill the RX queue during socket creation. In this case the
flag XDP_RING_NEED_WAKEUP is not set as this flag is only set if the RX
queue is not completely filled during polling.

Set XDP_RING_NEED_WAKEUP flag also if RX queue is not completely filled
during XDP socket creation.

Fixes: 3fc2333933 ("tsnep: Add XDP socket zero-copy RX support")
Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Gerhard Engleder 2024-01-23 21:09:18 +01:00 committed by Greg Kroah-Hartman
parent 3fc1e53499
commit d60ff1d313
1 changed files with 13 additions and 0 deletions
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13
drivers/net/ethernet/engleder/tsnep_main.c
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@ -1711,6 +1711,19 @@ static void tsnep_rx_reopen_xsk(struct tsnep_rx *rx)
allocated--;
}
}
/* set need wakeup flag immediately if ring is not filled completely,
* first polling would be too late as need wakeup signalisation would
* be delayed for an indefinite time
*/
if (xsk_uses_need_wakeup(rx->xsk_pool)) {
int desc_available = tsnep_rx_desc_available(rx);
if (desc_available)
xsk_set_rx_need_wakeup(rx->xsk_pool);
else
xsk_clear_rx_need_wakeup(rx->xsk_pool);
}
}
static bool tsnep_pending(struct tsnep_queue *queue)