From: Gerhard Engleder Date: Tue, 23 Jan 2024 20:09:18 +0000 (+0100) Subject: tsnep: Fix XDP_RING_NEED_WAKEUP for empty fill ring X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=9a91c05f4bd6f6bdd6b8f90445e0da92e3ac956c;p=linux.git tsnep: Fix XDP_RING_NEED_WAKEUP for empty fill ring 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: 3fc2333933fd ("tsnep: Add XDP socket zero-copy RX support") Signed-off-by: Gerhard Engleder Signed-off-by: Paolo Abeni --- diff --git a/drivers/net/ethernet/engleder/tsnep_main.c b/drivers/net/ethernet/engleder/tsnep_main.c index 456e0336f3f66..9aeff2b37a612 100644 --- a/drivers/net/ethernet/engleder/tsnep_main.c +++ b/drivers/net/ethernet/engleder/tsnep_main.c @@ -1762,6 +1762,19 @@ 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)