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pcie_set_mps(9) [centos man page]

PCIE_SET_MPS(9) 						Hardware Interfaces						   PCIE_SET_MPS(9)

NAME
pcie_set_mps - set PCI Express maximum payload size SYNOPSIS
int pcie_set_mps(struct pci_dev * dev, int mps); ARGUMENTS
dev PCI device to query mps maximum payload size in bytes valid values are 128, 256, 512, 1024, 2048, 4096 DESCRIPTION
If possible sets maximum payload size COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 PCIE_SET_MPS(9)

Check Out this Related Man Page

KEYCTL_UPDATE(3)					    Linux Key Management Calls						  KEYCTL_UPDATE(3)

NAME
keyctl_update - Update a key SYNOPSIS
#include <keyutils.h> long keyctl_update(key_serial_t key, const char *payload, size_t plen); DESCRIPTION
keyctl_update() updates the payload of a key if the key type permits it. The caller must have write permission on a key to be able update it. payload and plen specify the data for the new payload. payload may be NULL and plen may be zero if the key type permits that. The key type may reject the data if it's in the wrong format or in some other way invalid. RETURN VALUE
On success keyctl_update() returns 0. On error, the value -1 will be returned and errno will have been set to an appropriate error. ERRORS
ENOKEY The key specified is invalid. EKEYEXPIRED The key specified has expired. EKEYREVOKED The key specified had been revoked. EINVAL The payload data was invalid. ENOMEM Insufficient memory to store the new payload. EDQUOT The key quota for this user would be exceeded by increasing the size of the key to accommodate the new payload. EACCES The key exists, but is not writable by the calling process. EOPNOTSUPP The key type does not support the update operation on its keys. LINKING
This is a library function that can be found in libkeyutils. When linking, -lkeyutils should be specified to the linker. SEE ALSO
keyctl(1), add_key(2), keyctl(2), request_key(2), keyctl_get_keyring_ID(3), keyctl_join_session_keyring(3), keyctl_revoke(3), keyctl_chown(3), keyctl_setperm(3), keyctl_describe(3), keyctl_clear(3), keyctl_link(3), keyctl_unlink(3), keyctl_search(3), keyctl_read(3), keyctl_instantiate(3), keyctl_negate(3), keyctl_set_reqkey_keyring(3), keyctl_set_timeout(3), keyctl_assume_authority(3), keyctl_describe_alloc(3), keyctl_read_alloc(3), request-key(8) Linux 4 May 2006 KEYCTL_UPDATE(3)

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