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Message-ID: <ZV9jzHCQy1DZvyfk@hog>
Date: Thu, 23 Nov 2023 15:38:04 +0100
From: Sabrina Dubroca <sd@...asysnail.net>
To: Rahul Rameshbabu <rrameshbabu@...dia.com>
Cc: netdev@...r.kernel.org, Leon Romanovsky <leon@...nel.org>,
Saeed Mahameed <saeed@...nel.org>, Gal Pressman <gal@...dia.com>,
Tariq Toukan <tariqt@...dia.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH RFC net-next v1 2/3] macsec: Detect if Rx skb is
macsec-related for offloading devices that update md_dst
2023-11-16, 10:28:59 -0800, Rahul Rameshbabu wrote:
> This detection capability will enable drivers that update md_dst to be able
> to receive and handle both non-MACSec and MACsec traffic received and the
> same physical port when offload is enabled.
>
> This detection is not possible without device drivers that update md_dst. A
> fallback pattern should be used for supporting such device drivers. This
> fallback mode causes multicast messages to be cloned to both the non-macsec
> and macsec ports, independent of whether the multicast message received was
> encrypted over MACsec or not. Other non-macsec traffic may also fail to be
> handled correctly for devices in promiscuous mode.
>
> Link: https://lore.kernel.org/netdev/ZULRxX9eIbFiVi7v@hog/
> Cc: Sabrina Dubroca <sd@...asysnail.net>
> Signed-off-by: Rahul Rameshbabu <rrameshbabu@...dia.com>
> ---
> drivers/net/macsec.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
> index 8c0b12490e89..e14f2ad2e253 100644
> --- a/drivers/net/macsec.c
> +++ b/drivers/net/macsec.c
> @@ -1002,6 +1002,7 @@ static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
> rcu_read_lock();
> rxd = macsec_data_rcu(skb->dev);
> md_dst = skb_metadata_dst(skb);
> + bool is_macsec_md_dst = md_dst && md_dst->type == METADATA_MACSEC;
>
> list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
> struct sk_buff *nskb;
> @@ -1014,10 +1015,13 @@ static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
> if (macsec_is_offloaded(macsec) && netif_running(ndev)) {
> struct macsec_rx_sc *rx_sc = NULL;
>
> - if (md_dst && md_dst->type == METADATA_MACSEC)
> + if (macsec->offload_md_dst && !is_macsec_md_dst)
> + continue;
> +
> + if (is_macsec_md_dst)
> rx_sc = find_rx_sc(&macsec->secy, md_dst->u.macsec_info.sci);
>
> - if (md_dst && md_dst->type == METADATA_MACSEC && !rx_sc)
> + if (is_macsec_md_dst && !rx_sc)
> continue;
>
> if (ether_addr_equal_64bits(hdr->h_dest,
Why not skip the MAC address matching if you found the rx_sc? The way
you're implementing it, it will still distribute broadcast received
over the macsec port to other macsec ports on the same device, right?
If the device provided md_dst, either we find the corresponding rx_sc,
then we receive on this macsec device only, or we don't and try the
other macsec devices.
Something like this (completely untested):
if (macsec_is_offloaded(macsec) && netif_running(ndev)) {
struct macsec_rx_sc *rx_sc = NULL;
bool exact = false;
if (macsec->offload_md_dst && !is_macsec_md_dst)
continue;
if (is_macsec_md_dst) {
DEBUG_NET_WARN_ON_ONCE(!macsec->offload_md_dst);
rx_sc = find_rx_sc(&macsec->secy, md_dst->u.macsec_info.sci);
if (!rx_sc)
continue;
exact = true;
}
if (exact ||
ether_addr_equal_64bits(hdr->h_dest, ndev->dev_addr)) {
/* exact match, divert skb to this port */
[keep the existing code after this]
Am I missing something?
--
Sabrina
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