netdev - Re: [PATCH net-next 2/6] tsnep: Add XDP TX support

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Message-ID: <80f863b5-2507-358c-207c-46aac197a453@engleder-embedded.com>
Date:   Wed, 7 Dec 2022 21:05:53 +0100
From:   Gerhard Engleder <gerhard@...leder-embedded.com>
To:     Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, edumazet@...gle.com,
        ast@...nel.org, daniel@...earbox.net, hawk@...nel.org,
        john.fastabend@...il.com
Subject: Re: [PATCH net-next 2/6] tsnep: Add XDP TX support

On 07.12.22 11:24, Paolo Abeni wrote:
> On Sat, 2022-12-03 at 22:54 +0100, Gerhard Engleder wrote:
> [...]
>> +/* This function requires __netif_tx_lock is held by the caller. */
>> +static int tsnep_xdp_xmit_frame_ring(struct xdp_frame *xdpf,
>> +				     struct tsnep_tx *tx, bool dma_map)
>> +{
>> +	struct skb_shared_info *shinfo = xdp_get_shared_info_from_frame(xdpf);
>> +	unsigned long flags;
>> +	int count = 1;
>> +	struct tsnep_tx_entry *entry;
>> +	int length;
>> +	int i;
>> +	int retval;
>> +
>> +	if (unlikely(xdp_frame_has_frags(xdpf)))
>> +		count += shinfo->nr_frags;
>> +
>> +	spin_lock_irqsave(&tx->lock, flags);
> 
> Not strictily related to this patch, but why are you using the _irqsafe
> variant? it looks like all the locak users are either in process or BH
> context.

You are right. I will check that and would post a patch later.

Thank you!

Gerhard