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SUNRPC: receive buffer size estimation values almost never change

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Avoid unnecessary cache sloshing by placing the buffer size
estimation update logic behind an atomic bit flag.

The size of GSS information included in each wrapped Reply does
not change during the lifetime of a GSS context. Therefore, the
au_rslack and au_ralign fields need to be updated only once after
establishing a fresh GSS credential.

Thus a slack size update must occur after a cred is created,
duplicated, renewed, or expires. I'm not sure I have this exactly
right. A trace point is introduced to track updates to these
variables to enable troubleshooting the problem if I missed a spot.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2020-05-12 17:13:01 -04:00 • committed by Anna Schumaker
parent ef31d878b2
commit 53bc19f17f
4 changed files with 69 additions and 18 deletions
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5
include/linux/sunrpc/auth.h
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@ -76,7 +76,7 @@ struct rpc_auth {
unsigned int au_verfsize; /* size of reply verifier */
unsigned int au_ralign; /* words before UL header */
unsigned int au_flags;
unsigned long au_flags;
const struct rpc_authops *au_ops;
rpc_authflavor_t au_flavor; /* pseudoflavor (note may
* differ from the flavor in
@ -89,7 +89,8 @@ struct rpc_auth {
};
/* rpc_auth au_flags */
#define RPCAUTH_AUTH_DATATOUCH 0x00000002
#define RPCAUTH_AUTH_DATATOUCH (1)
#define RPCAUTH_AUTH_UPDATE_SLACK (2)
struct rpc_auth_create_args {
rpc_authflavor_t pseudoflavor;