d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

mlx4en: Optimise reception of small packets.

Browse Source 
Copy small packets like TCP ACKs into a new mbuf
reusing the existing mbuf to receive a new ethernet
frame. This avoids wasting buffer space for
small sized packets.

Submitted by:   hselasky@
Approved by:    hselasky (mentor)
MFC after:      1 week
Sponsored by:   Mellanox Technologies
This commit is contained in:
Slava Shwartsman 2018-12-05 13:39:35 +00:00
parent 6217a33f85
commit 8567696305
1 changed files with 18 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
sys/dev/mlx4/mlx4_en/mlx4_en_rx.c
View File

@ -629,6 +629,24 @@ mlx4_en_rx_mb(struct mlx4_en_priv *priv, struct mlx4_en_rx_ring *ring,
#endif
struct mbuf *mb;
/* optimise reception of small packets */
if (length <= (MHLEN - MLX4_NET_IP_ALIGN) &&
(mb = m_gethdr(M_NOWAIT, MT_DATA)) != NULL) {
/* set packet length */
mb->m_pkthdr.len = mb->m_len = length;
/* make sure IP header gets aligned */
mb->m_data += MLX4_NET_IP_ALIGN;
bus_dmamap_sync(ring->dma_tag, mb_list->dma_map,
BUS_DMASYNC_POSTREAD);
bcopy(mtod(mb_list->mbuf, caddr_t), mtod(mb, caddr_t), length);
return (mb);
}
/* get mbuf */
mb = mb_list->mbuf;