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eth: fbnic: don't build the driver when skb has more than 21 frags

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Similarly to commit 0e03c643dc ("eth: fbnic: fix s390 build."),
the driver won't build if skb_shared_info has more than 25 frags
assuming a 64B cache line and 21 frags assuming a 128B cache line.

  (512 - 48 -  64) / 16 = 25
  (512 - 48 - 128) / 16 = 21

Fixes: 0cb4c0a137 ("eth: fbnic: Implement Rx queue alloc/start/stop/free")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Link: https://patch.msgid.link/20240717161600.1291544-1-kuba@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Jakub Kicinski 2024-07-17 09:15:59 -07:00 committed by Paolo Abeni
parent a1b7dbca14
commit 4359836129
1 changed files with 1 additions and 0 deletions
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drivers/net/ethernet/meta/Kconfig
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@ -21,6 +21,7 @@ config FBNIC
tristate "Meta Platforms Host Network Interface"
depends on X86_64 || COMPILE_TEST
depends on S390=n
depends on MAX_SKB_FRAGS < 22
depends on PCI_MSI
select PHYLINK
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