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| Started by | Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
|---|---|
| First post | 2016-09-12 19:10 +0200 |
| Last post | 2016-09-12 19:10 +0200 |
| Articles | 1 — 1 participant |
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[PATCH 4.4 020/192] [PATCH 020/135] fm10k: Fix handling of NAPI budget when multiple queues are enabled per vector Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-09-12 19:10 +0200
| From | Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
|---|---|
| Date | 2016-09-12 19:10 +0200 |
| Subject | [PATCH 4.4 020/192] [PATCH 020/135] fm10k: Fix handling of NAPI budget when multiple queues are enabled per vector |
| Message-ID | <sgCU3-6aZ-67@gated-at.bofh.it> |
4.4-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit 9f872986479b6e0543eb5c615e5f9491bb04e5c1 ] This patch corrects an issue in which the polling routine would increase the budget for Rx to at least 1 per queue if multiple queues were present. This would result in Rx packets being processed when the budget was 0 which is meant to indicate that no Rx can be handled. Signed-off-by: Alexander Duyck <aduyck@mirantis.com> Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/net/ethernet/intel/fm10k/fm10k_main.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/net/ethernet/intel/fm10k/fm10k_main.c +++ b/drivers/net/ethernet/intel/fm10k/fm10k_main.c @@ -1428,6 +1428,10 @@ static int fm10k_poll(struct napi_struct fm10k_for_each_ring(ring, q_vector->tx) clean_complete &= fm10k_clean_tx_irq(q_vector, ring); + /* Handle case where we are called by netpoll with a budget of 0 */ + if (budget <= 0) + return budget; + /* attempt to distribute budget to each queue fairly, but don't * allow the budget to go below 1 because we'll exit polling */
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