From 48a783456de97fa524922d24799ef15f125038b5 Mon Sep 17 00:00:00 2001 From: =?utf8?q?=C3=8D=C3=B1igo=20Huguet?= Date: Tue, 13 Jul 2021 16:21:28 +0200 Subject: [PATCH] sfc: ensure correct number of XDP queues MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Commit be95fea3a160 ("sfc: adjust efx->xdp_tx_queue_count with the real number of initialized queues") intended to fix a problem caused by a round up when calculating the number of XDP channels and queues. However, this was not the real problem. The real problem was that the number of XDP TX queues had been reduced to half in commit dad6c821dff0 ("sfc: reduce the number of requested xdp ev queues"), but the variable xdp_tx_queue_count had remained the same. Once the correct number of XDP TX queues is created again in the previous patch of this series, this also can be reverted since the error doesn't actually exist. Only in the case that there is a bug in the code we can have different values in xdp_queue_number and efx->xdp_tx_queue_count. Because of this, and per Edward Cree's suggestion, I add instead a WARN_ON to catch if it happens again in the future. Note that the number of allocated queues can be higher than the number of used ones due to the round up, as explained in the existing comment in the code. That's why we also have to stop increasing xdp_queue_number beyond efx->xdp_tx_queue_count. Signed-off-by: Íñigo Huguet Signed-off-by: David S. Miller --- drivers/net/ethernet/sfc/efx_channels.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/sfc/efx_channels.c b/drivers/net/ethernet/sfc/efx_channels.c index 5b71f8a03a6d5..bb48a139dd158 100644 --- a/drivers/net/ethernet/sfc/efx_channels.c +++ b/drivers/net/ethernet/sfc/efx_channels.c @@ -892,18 +892,20 @@ int efx_set_channels(struct efx_nic *efx) if (efx_channel_is_xdp_tx(channel)) { efx_for_each_channel_tx_queue(tx_queue, channel) { tx_queue->queue = next_queue++; - netif_dbg(efx, drv, efx->net_dev, "Channel %u TXQ %u is XDP %u, HW %u\n", - channel->channel, tx_queue->label, - xdp_queue_number, tx_queue->queue); + /* We may have a few left-over XDP TX * queues owing to xdp_tx_queue_count * not dividing evenly by EFX_MAX_TXQ_PER_CHANNEL. * We still allocate and probe those * TXQs, but never use them. */ - if (xdp_queue_number < efx->xdp_tx_queue_count) + if (xdp_queue_number < efx->xdp_tx_queue_count) { + netif_dbg(efx, drv, efx->net_dev, "Channel %u TXQ %u is XDP %u, HW %u\n", + channel->channel, tx_queue->label, + xdp_queue_number, tx_queue->queue); efx->xdp_tx_queues[xdp_queue_number] = tx_queue; - xdp_queue_number++; + xdp_queue_number++; + } } } else { efx_for_each_channel_tx_queue(tx_queue, channel) { @@ -915,8 +917,7 @@ int efx_set_channels(struct efx_nic *efx) } } } - if (xdp_queue_number) - efx->xdp_tx_queue_count = xdp_queue_number; + WARN_ON(xdp_queue_number != efx->xdp_tx_queue_count); rc = netif_set_real_num_tx_queues(efx->net_dev, efx->n_tx_channels); if (rc) -- 2.39.5