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| author | Jakub Kicinski <jakub.kicinski@netronome.com> | 2017-05-15 17:55:22 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-05-16 12:59:04 -0400 |
| commit | 4aa3b7660aa79bb030aaa887dc16a60e02fa4348 (patch) | |
| tree | 1a96f186c151530f5c6b24bdb071934b34566418 /drivers/net/ethernet/netronome/nfp/nfp_net.h | |
| parent | abeeec4adf6a6fe71a6a4d8199ff0a533d73a57f (diff) | |
| download | lwn-4aa3b7660aa79bb030aaa887dc16a60e02fa4348.tar.gz lwn-4aa3b7660aa79bb030aaa887dc16a60e02fa4348.zip | |
nfp: add a helper for wrapping descriptor index
We have a number of places where we calculate the descriptor
index based on a value which may have overflown. Create a
macro for masking with the ring size.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/netronome/nfp/nfp_net.h')
| -rw-r--r-- | drivers/net/ethernet/netronome/nfp/nfp_net.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net.h b/drivers/net/ethernet/netronome/nfp/nfp_net.h index 66319a1026bb..7b9518cbe965 100644 --- a/drivers/net/ethernet/netronome/nfp/nfp_net.h +++ b/drivers/net/ethernet/netronome/nfp/nfp_net.h @@ -117,6 +117,9 @@ struct nfp_eth_table_port; struct nfp_net; struct nfp_net_r_vector; +/* Convenience macro for wrapping descriptor index on ring size */ +#define D_IDX(ring, idx) ((idx) & ((ring)->cnt - 1)) + /* Convenience macro for writing dma address into RX/TX descriptors */ #define nfp_desc_set_dma_addr(desc, dma_addr) \ do { \ |