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net: dsa: b53: support legacy FCS tags

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Commit 46c5176c58 ("net: dsa: b53: support legacy tags") introduced
support for legacy tags, but it turns out that BCM5325 and BCM5365
switches require the original FCS value and length, so they have to be
treated differently.

Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Link: https://patch.msgid.link/20250614080000.1884236-4-noltari@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Álvaro Fernández Rojas
2025-06-14 09:59:49 +02:00
committed by Jakub Kicinski
parent ef07df397a
commit c3cf059a4d
2 changed files with 6 additions and 2 deletions
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1
drivers/net/dsa/b53/Kconfig
View File

@@ -5,6 +5,7 @@ menuconfig B53
select NET_DSA_TAG_NONE
select NET_DSA_TAG_BRCM
select NET_DSA_TAG_BRCM_LEGACY
select NET_DSA_TAG_BRCM_LEGACY_FCS
select NET_DSA_TAG_BRCM_PREPEND
help
This driver adds support for Broadcom managed switch chips. It supports

7
drivers/net/dsa/b53/b53_common.c
View File

@@ -2241,8 +2241,11 @@ enum dsa_tag_protocol b53_get_tag_protocol(struct dsa_switch *ds, int port,
goto out;
}
/* Older models require a different 6 byte tag */
if (is5325(dev) || is5365(dev) || is63xx(dev)) {
/* Older models require different 6 byte tags */
if (is5325(dev) || is5365(dev)) {
dev->tag_protocol = DSA_TAG_PROTO_BRCM_LEGACY_FCS;
goto out;
} else if (is63xx(dev)) {
dev->tag_protocol = DSA_TAG_PROTO_BRCM_LEGACY;
goto out;
}