diff options
author | Roland Dreier <roland@topspin.com> | 2005-04-16 18:26:06 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:26:06 -0400 |
commit | e6ded99cbbbfef2cef537d717ad61d2f77f4dfd6 (patch) | |
tree | 44ef73e8f9ac7bdfc71ff3286e6b2715aafbbd9d /drivers/infiniband/ulp/ipoib | |
parent | 62241eb497721be7640e5d9330e60f4a88a4db46 (diff) |
[PATCH] IPoIB: fix static rate calculation
Correct and simplify calculation of static rate. We need to round up the
quotient of (local_rate - path_rate) / path_rate. To round up we add
(path_rate - 1) to the numerator, so the quotient simplifies to (local_rate -
1) / path_rate.
No idea how I came up with the old formula.
Signed-off-by: Roland Dreier <roland@topspin.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/infiniband/ulp/ipoib')
-rw-r--r-- | drivers/infiniband/ulp/ipoib/ipoib_main.c | 7 | ||||
-rw-r--r-- | drivers/infiniband/ulp/ipoib/ipoib_multicast.c | 7 |
2 files changed, 6 insertions, 8 deletions
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c index 5a3b5c6a4494..8d35475a1d56 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_main.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c | |||
@@ -302,11 +302,10 @@ static void path_rec_completion(int status, | |||
302 | .sl = pathrec->sl, | 302 | .sl = pathrec->sl, |
303 | .port_num = priv->port | 303 | .port_num = priv->port |
304 | }; | 304 | }; |
305 | int path_rate = ib_sa_rate_enum_to_int(pathrec->rate); | ||
305 | 306 | ||
306 | if (ib_sa_rate_enum_to_int(pathrec->rate) > 0) | 307 | if (path_rate > 0 && priv->local_rate > path_rate) |
307 | av.static_rate = (2 * priv->local_rate - | 308 | av.static_rate = (priv->local_rate - 1) / path_rate; |
308 | ib_sa_rate_enum_to_int(pathrec->rate) - 1) / | ||
309 | (priv->local_rate ? priv->local_rate : 1); | ||
310 | 309 | ||
311 | ipoib_dbg(priv, "static_rate %d for local port %dX, path %dX\n", | 310 | ipoib_dbg(priv, "static_rate %d for local port %dX, path %dX\n", |
312 | av.static_rate, priv->local_rate, | 311 | av.static_rate, priv->local_rate, |
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c index f46932dc81c9..70208c3d21e2 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c | |||
@@ -258,13 +258,12 @@ static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast, | |||
258 | .traffic_class = mcast->mcmember.traffic_class | 258 | .traffic_class = mcast->mcmember.traffic_class |
259 | } | 259 | } |
260 | }; | 260 | }; |
261 | int path_rate = ib_sa_rate_enum_to_int(mcast->mcmember.rate); | ||
261 | 262 | ||
262 | av.grh.dgid = mcast->mcmember.mgid; | 263 | av.grh.dgid = mcast->mcmember.mgid; |
263 | 264 | ||
264 | if (ib_sa_rate_enum_to_int(mcast->mcmember.rate) > 0) | 265 | if (path_rate > 0 && priv->local_rate > path_rate) |
265 | av.static_rate = (2 * priv->local_rate - | 266 | av.static_rate = (priv->local_rate - 1) / path_rate; |
266 | ib_sa_rate_enum_to_int(mcast->mcmember.rate) - 1) / | ||
267 | (priv->local_rate ? priv->local_rate : 1); | ||
268 | 267 | ||
269 | ipoib_dbg_mcast(priv, "static_rate %d for local port %dX, mcmember %dX\n", | 268 | ipoib_dbg_mcast(priv, "static_rate %d for local port %dX, mcmember %dX\n", |
270 | av.static_rate, priv->local_rate, | 269 | av.static_rate, priv->local_rate, |