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From: "Jason A. Donenfeld" <Jason@zx2c4.com>
To: Marek Mietus <mmietus97@yahoo.com>
Cc: netdev@vger.kernel.org, sd@queasysnail.net, kuba@kernel.org
Subject: Re: [PATCH net-next v4 09/14] net: wireguard: convert send{4,6} to use a noref dst when possible
Date: Thu, 13 Nov 2025 17:40:51 +0100	[thread overview]
Message-ID: <aRYKE2rKobILiqAG@zx2c4.com> (raw)
In-Reply-To: <20251112072720.5076-10-mmietus97@yahoo.com>

Hi Marek,

On Wed, Nov 12, 2025 at 08:27:15AM +0100, Marek Mietus wrote:
> send{4,6} unnecessarily reference the dst_entry from the
> dst_cache when interacting with the cache.
> 
> Reduce this overhead by avoiding the redundant refcount increments.
> 
> This is only possible in flows where the cache is used. Otherwise, we
> fall-back to a referenced dst.
> 
> These changes are safe as both ipv4 and ip6 support noref xmit under RCU
> which is already the case for the wireguard send{4,6} functions.

Assuming the rest of the patchset is fine, this patch is okay with me,
with one very small nit. The commit subject should be
    wireguard: socket: convert send{4,6} to use a noref dst when possible
instead of "net: wireguard" etc.

Please CC me on future revisions of this if you do a v2, and I'll give
my reviewed-by.

Thanks,
Jason

  reply	other threads:[~2025-11-13 16:40 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20251112072720.5076-1-mmietus97.ref@yahoo.com>
2025-11-12  7:27 ` [PATCH net-next v4 00/14] net: tunnel: introduce noref xmit flows for tunnels Marek Mietus
2025-11-12  7:27   ` [PATCH net-next v4 01/14] net: dst: implement dstref object Marek Mietus
2025-11-12  7:27   ` [PATCH net-next v4 02/14] net: skb: use dstref for storing dst entry Marek Mietus
2025-11-12 17:09     ` Sabrina Dubroca
2025-11-13  9:36       ` Marek Mietus
     [not found]         ` <CANn89i+qce6WJYUpjH93SMRKA8cQ6Wt-b81O6gu9V5GGnDeo_A@mail.gmail.com>
2025-11-13 18:17           ` Sabrina Dubroca
2025-11-17 11:31             ` Marek Mietus
2025-11-18  0:10               ` Jakub Kicinski
2025-11-12  7:27   ` [PATCH net-next v4 03/14] net: skb: rename skb_dstref_restore to skb_dstref_set Marek Mietus
2025-11-12  7:27   ` [PATCH net-next v4 04/14] net: dst_cache: add noref versions for dst_cache Marek Mietus
2025-11-12  7:27   ` [PATCH net-next v4 05/14] net: tunnel: use dstref in ip and udp tunnel xmit functions Marek Mietus
2025-11-12  7:27   ` [PATCH net-next v4 06/14] net: tunnel: return dstref in udp_tunnel{,6}_dst_lookup Marek Mietus
2025-11-12  7:27   ` [PATCH net-next v4 07/14] net: tunnel: make udp_tunnel{,6}_dst_lookup return a noref dst Marek Mietus
2025-11-12  7:27   ` [PATCH net-next v4 08/14] net: ovpn: convert ovpn_udp{4,6}_output to use " Marek Mietus
2025-11-12  7:27   ` [PATCH net-next v4 09/14] net: wireguard: convert send{4,6} to use a noref dst when possible Marek Mietus
2025-11-13 16:40     ` Jason A. Donenfeld [this message]
2025-11-12  7:33   ` [PATCH net-next v4 10/14] net: tunnel: convert ip_md_tunnel_xmit " Marek Mietus
2025-11-12  7:33   ` [PATCH net-next v4 11/14] net: tunnel: convert ip_tunnel_xmit " Marek Mietus
2025-11-12  7:33   ` [PATCH net-next v4 12/14] net: sit: convert ipip6_tunnel_xmit to use a noref dst Marek Mietus
2025-11-12  7:33   ` [PATCH net-next v4 13/14] net: tipc: convert tipc_udp_xmit " Marek Mietus
2025-11-12  7:33   ` [PATCH net-next v4 14/14] net: sctp: convert sctp_v{4,6}_xmit to use a noref dst when possible Marek Mietus

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