linux-kernel - [PATCH net-next] sfc: reduce the number of requested xdp ev queues

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Date:   Mon, 14 Dec 2020 17:29:06 -0800
From:   Ivan Babrou <ivan@...udflare.com>
To:     netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
        kernel-team@...udflare.com, Ivan Babrou <ivan@...udflare.com>,
        Edward Cree <ecree.xilinx@...il.com>,
        Martin Habets <habetsm.xilinx@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>
Subject: [PATCH net-next] sfc: reduce the number of requested xdp ev queues

Without this change the driver tries to allocate too many queues,
breaching the number of available msi-x interrupts on machines
with many logical cpus and default adapter settings:

Insufficient resources for 12 XDP event queues (24 other channels, max 32)

Which in turn triggers EINVAL on XDP processing:

sfc 0000:86:00.0 ext0: XDP TX failed (-22)

Signed-off-by: Ivan Babrou <ivan@...udflare.com>
---
 drivers/net/ethernet/sfc/efx_channels.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/sfc/efx_channels.c b/drivers/net/ethernet/sfc/efx_channels.c
index a4a626e9cd9a..1bfeee283ea9 100644
--- a/drivers/net/ethernet/sfc/efx_channels.c
+++ b/drivers/net/ethernet/sfc/efx_channels.c
@@ -17,6 +17,7 @@
 #include "rx_common.h"
 #include "nic.h"
 #include "sriov.h"
+#include "workarounds.h"
 
 /* This is the first interrupt mode to try out of:
  * 0 => MSI-X
@@ -137,6 +138,7 @@ static int efx_allocate_msix_channels(struct efx_nic *efx,
 {
 	unsigned int n_channels = parallelism;
 	int vec_count;
+	int tx_per_ev;
 	int n_xdp_tx;
 	int n_xdp_ev;
 
@@ -149,9 +151,9 @@ static int efx_allocate_msix_channels(struct efx_nic *efx,
 	 * multiple tx queues, assuming tx and ev queues are both
 	 * maximum size.
 	 */
-
+	tx_per_ev = EFX_MAX_EVQ_SIZE / EFX_TXQ_MAX_ENT(efx);
 	n_xdp_tx = num_possible_cpus();
-	n_xdp_ev = DIV_ROUND_UP(n_xdp_tx, EFX_MAX_TXQ_PER_CHANNEL);
+	n_xdp_ev = DIV_ROUND_UP(n_xdp_tx, tx_per_ev);
 
 	vec_count = pci_msix_vec_count(efx->pci_dev);
 	if (vec_count < 0)
-- 
2.29.2