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net: inline net_is_devmem_iov()

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1) Inline this small helper to reduce code size and decrease cpu costs.
2) Constify its argument.
3) Move it to include/net/netmem.h, as a prereq for the following patch.

$ scripts/bloat-o-meter -t vmlinux.2 vmlinux.3
add/remove: 0/2 grow/shrink: 0/4 up/down: 0/-158 (-158)
Function                                     old     new   delta
validate_xmit_skb                            866     857      -9
__pfx_net_is_devmem_iov                       16       -     -16
net_is_devmem_iov                             22       -     -22
get_netmem                                   152     130     -22
put_netmem                                   140     114     -26
tcp_recvmsg_locked                          3860    3797     -63
Total: Before=22566015, After=22565857, chg -0.00%

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260122045720.1221017-4-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2026-01-22 04:57:18 +00:00 • committed by Jakub Kicinski
parent cbe41362be
commit 87918dd4ea
3 changed files with 13 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

12
include/net/netmem.h
View file

@ -389,6 +389,18 @@ static inline unsigned long netmem_get_dma_addr(netmem_ref netmem)
return netmem_to_nmdesc(netmem)->dma_addr;
}
#if defined(CONFIG_NET_DEVMEM)
static inline bool net_is_devmem_iov(const struct net_iov *niov)
{
return niov->type == NET_IOV_DMABUF;
}
#else
static inline bool net_is_devmem_iov(const struct net_iov *niov)
{
return false;
}
#endif
void get_netmem(netmem_ref netmem);
void put_netmem(netmem_ref netmem);

5
net/core/devmem.c
View file

@ -30,11 +30,6 @@ static DEFINE_XARRAY_FLAGS(net_devmem_dmabuf_bindings, XA_FLAGS_ALLOC1);
static const struct memory_provider_ops dmabuf_devmem_ops;
bool net_is_devmem_iov(struct net_iov *niov)
{
return niov->type == NET_IOV_DMABUF;
}
static void net_devmem_dmabuf_free_chunk_owner(struct gen_pool *genpool,
struct gen_pool_chunk *chunk,
void *not_used)

7
net/core/devmem.h
View file

@ -141,7 +141,7 @@ struct net_iov *
net_devmem_alloc_dmabuf(struct net_devmem_dmabuf_binding *binding);
void net_devmem_free_dmabuf(struct net_iov *ppiov);
bool net_is_devmem_iov(struct net_iov *niov);
struct net_devmem_dmabuf_binding *
net_devmem_get_binding(struct sock *sk, unsigned int dmabuf_id);
struct net_iov *
@ -214,11 +214,6 @@ static inline u32 net_devmem_iov_binding_id(const struct net_iov *niov)
return 0;
}
static inline bool net_is_devmem_iov(struct net_iov *niov)
{
return false;
}
static inline struct net_devmem_dmabuf_binding *
net_devmem_get_binding(struct sock *sk, unsigned int dmabuf_id)
{