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From: Jesper Dangaard Brouer <brouer@redhat.com>
To: <sameehj@amazon.com>
Cc: brouer@redhat.com, <davem@davemloft.net>,
	<netdev@vger.kernel.org>, <dwmw@amazon.com>,
	"Machulsky, Zorik" <zorik@amazon.com>, <matua@amazon.com>,
	<saeedb@amazon.com>, <msw@amazon.com>, <aliguori@amazon.com>,
	<nafea@amazon.com>, <gtzalik@amazon.com>, <netanel@amazon.com>,
	<alisaidi@amazon.com>, <benh@amazon.com>, <akiyano@amazon.com>,
	Daniel Borkmann <borkmann@iogearbox.net>
Subject: Re: [RFC V1 net-next 1/1] net: ena: implement XDP drop support
Date: Sun, 23 Jun 2019 16:09:24 +0200
Message-ID: <20190623160924.19456df5@carbon> (raw)
In-Reply-To: <20190623070649.18447-2-sameehj@amazon.com>


I'm very happy to see progress with XDP for the ENA driver.

On Sun, 23 Jun 2019 10:06:49 +0300 <sameehj@amazon.com> wrote:

> @@ -888,6 +959,15 @@ static struct sk_buff *ena_rx_skb(struct ena_ring *rx_ring,
>  	va = page_address(rx_info->page) + rx_info->page_offset;
>  	prefetch(va + NET_IP_ALIGN);
>  
> +	if (ena_xdp_present_ring(rx_ring)) {
> +		rx_ring->xdp.data = va;
> +		rx_ring->xdp.data_meta = rx_ring->xdp.data;
> +		rx_ring->xdp.data_hard_start = rx_ring->xdp.data -
> +			rx_info->page_offset;
> +		rx_ring->xdp.data_end = rx_ring->xdp.data + len;
> +		if (ena_xdp_execute(rx_ring, &rx_ring->xdp) != XDP_PASS)
> +			return NULL;
> +	}

Looks like you forgot to init xdp.rxq pointer.

You can use the samples/bpf/xdp_rxq_info* to access this... and this
driver will likely crash if you use it...

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer

  reply index

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-23  7:06 [RFC V1 net-next 0/1] Introduce xdp to ena sameehj
2019-06-23  7:06 ` [RFC V1 net-next 1/1] net: ena: implement XDP drop support sameehj
2019-06-23 14:09   ` Jesper Dangaard Brouer [this message]
2019-06-23 14:21   ` Jesper Dangaard Brouer
2019-06-25  3:19     ` Machulsky, Zorik
2019-06-26  8:38       ` XDP multi-buffer incl. jumbo-frames (Was: [RFC V1 net-next 1/1] net: ena: implement XDP drop support) Jesper Dangaard Brouer
2019-06-26 11:52         ` Toke Høiland-Jørgensen
2019-06-26 14:40           ` Jesper Dangaard Brouer
2019-06-26 15:01             ` Toke Høiland-Jørgensen
2019-06-26 15:20               ` Willem de Bruijn
2019-06-26 16:42                 ` Jonathan Lemon
2019-06-26 20:00                   ` Jesper Dangaard Brouer
2019-06-27 22:07                     ` Jonathan Lemon
2019-06-28  8:46                 ` Jesper Dangaard Brouer
2019-06-26 15:14             ` Toke Høiland-Jørgensen
2019-06-26 16:36               ` Jesper Dangaard Brouer
2019-06-28  7:14         ` Eelco Chaudron
2019-06-28  7:46           ` Toke Høiland-Jørgensen
2019-06-28 11:49             ` Eelco Chaudron
2019-06-28  8:22           ` Jesper Dangaard Brouer
2019-06-23 14:28   ` [RFC V1 net-next 1/1] net: ena: implement XDP drop support David Ahern
2019-06-23 14:51   ` Maciej Fijalkowski

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