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| author | Stefan Raspl <raspl@linux.ibm.com> | 2018-05-23 16:38:11 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-05-23 16:02:35 -0400 |
| commit | de8474eb9d50fd47b8c73816f34739dec5e96754 (patch) | |
| tree | 4d8c4d02508896fefba4c7172162ebf1b8333798 /net/smc/smc_cdc.h | |
| parent | b9f227c37071d1115cec791b328b684e2c4ba414 (diff) | |
| download | lwn-de8474eb9d50fd47b8c73816f34739dec5e96754.tar.gz lwn-de8474eb9d50fd47b8c73816f34739dec5e96754.zip | |
net/smc: urgent data support
Add support for out of band data send and receive.
Signed-off-by: Stefan Raspl <raspl@linux.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/smc/smc_cdc.h')
| -rw-r--r-- | net/smc/smc_cdc.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/net/smc/smc_cdc.h b/net/smc/smc_cdc.h index d2012fd22100..f60082fee5b8 100644 --- a/net/smc/smc_cdc.h +++ b/net/smc/smc_cdc.h @@ -146,6 +146,19 @@ static inline int smc_curs_diff(unsigned int size, return max_t(int, 0, (new->count - old->count)); } +/* calculate cursor difference between old and new - returns negative + * value in case old > new + */ +static inline int smc_curs_comp(unsigned int size, + union smc_host_cursor *old, + union smc_host_cursor *new) +{ + if (old->wrap > new->wrap || + (old->wrap == new->wrap && old->count > new->count)) + return -smc_curs_diff(size, new, old); + return smc_curs_diff(size, old, new); +} + static inline void smc_host_cursor_to_cdc(union smc_cdc_cursor *peer, union smc_host_cursor *local, struct smc_connection *conn) |