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- From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <[email protected]>
- Date: Fri, 10 Jun 2022 13:10:47 +0200
- Subject: [PATCH] bgmac: reduce max frame size to support just MTU 1500
- MIME-Version: 1.0
- Content-Type: text/plain; charset=UTF-8
- Content-Transfer-Encoding: 8bit
- bgmac allocates new replacement buffer before handling each received
- frame. Allocating & DMA-preparing 9724 B each time consumes a lot of CPU
- time. Ideally bgmac should just respect currently set MTU but it isn't
- the case right now. For now just revert back to the old limited frame
- size.
- This change bumps NAT masquarade speed by ~95%.
- Ref: 8c7da63978f1 ("bgmac: configure MTU and add support for frames beyond 8192 byte size")
- Signed-off-by: Rafał Miłecki <[email protected]>
- ---
- drivers/net/ethernet/broadcom/bgmac.h | 3 +--
- 1 file changed, 1 insertion(+), 2 deletions(-)
- --- a/drivers/net/ethernet/broadcom/bgmac.h
- +++ b/drivers/net/ethernet/broadcom/bgmac.h
- @@ -328,8 +328,7 @@
- #define BGMAC_RX_FRAME_OFFSET 30 /* There are 2 unused bytes between header and real data */
- #define BGMAC_RX_BUF_OFFSET (NET_SKB_PAD + NET_IP_ALIGN - \
- BGMAC_RX_FRAME_OFFSET)
- -/* Jumbo frame size with FCS */
- -#define BGMAC_RX_MAX_FRAME_SIZE 9724
- +#define BGMAC_RX_MAX_FRAME_SIZE 1536
- #define BGMAC_RX_BUF_SIZE (BGMAC_RX_FRAME_OFFSET + BGMAC_RX_MAX_FRAME_SIZE)
- #define BGMAC_RX_ALLOC_SIZE (SKB_DATA_ALIGN(BGMAC_RX_BUF_SIZE + BGMAC_RX_BUF_OFFSET) + \
- SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
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