nfp: provide a better warning when ring allocation fails

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NFP supports fairly enormous ring sizes (up to 256k descriptors).
In commit 4662717038 ("nfp: use kvcalloc() to allocate SW buffer
descriptor arrays") we have started using kvcalloc() functions to
make sure the allocation of software state arrays doesn't hit
the MAX_ORDER limit.  Unfortunately, we can't use virtual mappings
for the DMA region holding HW descriptors.  In case this allocation
fails instead of the generic (and fairly scary) warning/splat in
the logs print a helpful message explaining what happened and
suggesting how to fix it.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Jakub Kicinski 2018-09-19 14:42:50 -07:00 • committed by David S. Miller

parent 806a81fcf6

commit 23d9f5531c

1 changed files with 12 additions and 4 deletions

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drivers/net/ethernet/netronome/nfp/nfp_net_common.c

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