From: Matteo Croce <mcroce@linux.microsoft.com>
To: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org,
Jonathan Lemon <jonathan.lemon@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Ilias Apalodimas <ilias.apalodimas@linaro.org>,
Jesper Dangaard Brouer <hawk@kernel.org>,
Lorenzo Bianconi <lorenzo@kernel.org>,
Saeed Mahameed <saeedm@nvidia.com>,
David Ahern <dsahern@gmail.com>,
Saeed Mahameed <saeed@kernel.org>, Andrew Lunn <andrew@lunn.ch>
Subject: [PATCH net-next 1/6] xdp: reduce size of struct xdp_mem_info
Date: Mon, 22 Mar 2021 18:02:56 +0100 [thread overview]
Message-ID: <20210322170301.26017-2-mcroce@linux.microsoft.com> (raw)
In-Reply-To: <20210322170301.26017-1-mcroce@linux.microsoft.com>
From: Jesper Dangaard Brouer <brouer@redhat.com>
It is possible to compress/reduce the size of struct xdp_mem_info.
This change reduce struct xdp_mem_info from 8 bytes to 4 bytes.
The member xdp_mem_info.id can be reduced to u16, as the mem_id_ht
rhashtable in net/core/xdp.c is already limited by MEM_ID_MAX=0xFFFE
which can safely fit in u16.
The member xdp_mem_info.type could be reduced more than u16, as it stores
the enum xdp_mem_type, but due to alignment it is only reduced to u16.
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
---
include/net/xdp.h | 4 ++--
net/core/xdp.c | 8 ++++----
2 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/include/net/xdp.h b/include/net/xdp.h
index a5bc214a49d9..c35864d59113 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -48,8 +48,8 @@ enum xdp_mem_type {
#define XDP_XMIT_FLAGS_MASK XDP_XMIT_FLUSH
struct xdp_mem_info {
- u32 type; /* enum xdp_mem_type, but known size type */
- u32 id;
+ u16 type; /* enum xdp_mem_type, but known size type */
+ u16 id;
};
struct page_pool;
diff --git a/net/core/xdp.c b/net/core/xdp.c
index 05354976c1fc..3dd47ed83778 100644
--- a/net/core/xdp.c
+++ b/net/core/xdp.c
@@ -35,11 +35,11 @@ static struct rhashtable *mem_id_ht;
static u32 xdp_mem_id_hashfn(const void *data, u32 len, u32 seed)
{
- const u32 *k = data;
- const u32 key = *k;
+ const u16 *k = data;
+ const u16 key = *k;
BUILD_BUG_ON(sizeof_field(struct xdp_mem_allocator, mem.id)
- != sizeof(u32));
+ != sizeof(u16));
/* Use cyclic increasing ID as direct hash key */
return key;
@@ -49,7 +49,7 @@ static int xdp_mem_id_cmp(struct rhashtable_compare_arg *arg,
const void *ptr)
{
const struct xdp_mem_allocator *xa = ptr;
- u32 mem_id = *(u32 *)arg->key;
+ u16 mem_id = *(u16 *)arg->key;
return xa->mem.id != mem_id;
}
--
2.30.2
next prev parent reply other threads:[~2021-03-22 17:04 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-22 17:02 [PATCH net-next 0/6] page_pool: recycle buffers Matteo Croce
2021-03-22 17:02 ` Matteo Croce [this message]
2021-03-22 17:02 ` [PATCH net-next 2/6] mm: add a signature in struct page Matteo Croce
2021-03-22 17:02 ` [PATCH net-next 3/6] page_pool: DMA handling and allow to recycles frames via SKB Matteo Croce
2021-03-22 19:38 ` Matteo Croce
2021-03-22 17:02 ` [PATCH net-next 4/6] net: change users of __skb_frag_unref() and add an extra argument Matteo Croce
2021-03-22 17:03 ` [PATCH net-next 5/6] mvpp2: recycle buffers Matteo Croce
2021-03-22 17:03 ` [PATCH net-next 6/6] mvneta: " Matteo Croce
2021-03-23 15:06 ` Jesper Dangaard Brouer
2021-03-24 9:28 ` Lorenzo Bianconi
2021-03-24 21:48 ` Ilias Apalodimas
2021-03-23 14:57 ` [PATCH net-next 0/6] page_pool: " David Ahern
2021-03-23 15:03 ` Ilias Apalodimas
2021-03-23 15:41 ` Alexander Lobakin
2021-03-23 15:47 ` Ilias Apalodimas
2021-03-23 16:04 ` Jesper Dangaard Brouer
2021-03-23 16:10 ` Ilias Apalodimas
2021-03-23 16:28 ` Matteo Croce
2021-03-23 16:55 ` Alexander Lobakin
2021-03-23 17:01 ` Ilias Apalodimas
2021-03-23 20:03 ` Alexander Lobakin
2021-03-24 7:50 ` Ilias Apalodimas
2021-03-24 11:42 ` Alexander Lobakin
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