f4676ea74b
Add nexthop group entry stats to count the number of packets forwarded
via each nexthop in the group. The stats will be exposed to user space
for better data path observability in the next patch.
The per-CPU stats pointer is placed at the beginning of 'struct
nh_grp_entry', so that all the fields accessed for the data path reside
on the same cache line:
struct nh_grp_entry {
struct nexthop * nh; /* 0 8 */
struct nh_grp_entry_stats * stats; /* 8 8 */
u8 weight; /* 16 1 */
/* XXX 7 bytes hole, try to pack */
union {
struct {
atomic_t upper_bound; /* 24 4 */
} hthr; /* 24 4 */
struct {
struct list_head uw_nh_entry; /* 24 16 */
u16 count_buckets; /* 40 2 */
u16 wants_buckets; /* 42 2 */
} res; /* 24 24 */
}; /* 24 24 */
struct list_head nh_list; /* 48 16 */
/* --- cacheline 1 boundary (64 bytes) --- */
struct nexthop * nh_parent; /* 64 8 */
/* size: 72, cachelines: 2, members: 6 */
/* sum members: 65, holes: 1, sum holes: 7 */
/* last cacheline: 8 bytes */
};
Co-developed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.