netdev - Re: [PATCH net-next 6/7] net: stmmac: Enable RX via AF

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Message-Id: <20210412.141916.1569200948681549246.davem@davemloft.net>
Date:   Mon, 12 Apr 2021 14:19:16 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     boon.leong.ong@...el.com
Cc:     peppe.cavallaro@...com, alexandre.torgue@...com,
        joabreu@...opsys.com, kuba@...nel.org, ast@...nel.org,
        daniel@...earbox.net, hawk@...nel.org, john.fastabend@...il.com,
        mcoquelin.stm32@...il.com, andrii@...nel.org, kafai@...com,
        songliubraving@...com, yhs@...com, kpsingh@...nel.org,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH net-next 6/7] net: stmmac: Enable RX via AF_XDP
 zero-copy

+	/* synchronize_rcu() needed for pending XDP buffers to drain */
+	for (queue = 0; queue < rx_queues_cnt; queue++) {
+		rx_q = &priv->rx_queue[queue];
+		if (rx_q->xsk_pool) {
+			synchronize_rcu();

Are you sure this is safe here, especially via the ->ndo_setup_tc() code path?

Thank you.