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hyperv/hn: Directly fill chimney sending buffer for small packets.

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MFC after:	1 week
Sponsored by:	Microsoft
Differential Revision:	https://reviews.freebsd.org/D8394
This commit is contained in:
Sepherosa Ziehau 2016-11-01 08:20:33 +00:00
parent edd3f31541
commit 8966e5d5b3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=308167
1 changed files with 34 additions and 22 deletions
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56
sys/dev/hyperv/netvsc/if_hn.c
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@ -1394,15 +1394,28 @@ hn_encap(struct hn_tx_ring *txr, struct hn_txdesc *txd, struct mbuf **m_head0)
struct mbuf *m_head = *m_head0;
struct rndis_packet_msg *pkt;
uint32_t *pi_data;
void *chim = NULL;
int pktlen;
/*
* extension points to the area reserved for the
* rndis_filter_packet, which is placed just after
* the netvsc_packet (and rppi struct, if present;
* length is updated later).
*/
pkt = txd->rndis_pkt;
if (m_head->m_pkthdr.len + HN_RNDIS_PKT_LEN < txr->hn_chim_size) {
/*
* This packet is small enough to fit into a chimney sending
* buffer. Try allocating one chimney sending buffer now.
*/
txr->hn_tx_chimney_tried++;
txd->chim_index = hn_chim_alloc(txr->hn_sc);
if (txd->chim_index != HN_NVS_CHIM_IDX_INVALID) {
chim = txr->hn_sc->hn_chim +
(txd->chim_index * txr->hn_sc->hn_chim_szmax);
/*
* Directly fill the chimney sending buffer w/ the
* RNDIS packet message.
*/
pkt = chim;
}
}
pkt->rm_type = REMOTE_NDIS_PACKET_MSG;
pkt->rm_len = sizeof(*pkt) + m_head->m_pkthdr.len;
pkt->rm_dataoffset = sizeof(*pkt);
@ -1475,26 +1488,25 @@ hn_encap(struct hn_tx_ring *txr, struct hn_txdesc *txd, struct mbuf **m_head0)
pkt->rm_pktinfooffset = hn_rndis_pktmsg_offset(pkt->rm_pktinfooffset);
/*
* Chimney send, if the packet could fit into one chimney buffer.
* Fast path: Chimney sending.
*/
if (pkt->rm_len < txr->hn_chim_size) {
txr->hn_tx_chimney_tried++;
txd->chim_index = hn_chim_alloc(txr->hn_sc);
if (txd->chim_index != HN_NVS_CHIM_IDX_INVALID) {
uint8_t *dest = txr->hn_sc->hn_chim +
(txd->chim_index * txr->hn_sc->hn_chim_szmax);
if (chim != NULL) {
KASSERT(txd->chim_index != HN_NVS_CHIM_IDX_INVALID,
("chimney buffer is not used"));
KASSERT(pkt == chim, ("RNDIS pkt not in chimney buffer"));
memcpy(dest, pkt, pktlen);
dest += pktlen;
m_copydata(m_head, 0, m_head->m_pkthdr.len, dest);
m_copydata(m_head, 0, m_head->m_pkthdr.len,
((uint8_t *)chim) + pktlen);
txd->chim_size = pkt->rm_len;
txr->hn_gpa_cnt = 0;
txr->hn_tx_chimney++;
txr->hn_sendpkt = hn_txpkt_chim;
goto done;
}
txd->chim_size = pkt->rm_len;
txr->hn_gpa_cnt = 0;
txr->hn_tx_chimney++;
txr->hn_sendpkt = hn_txpkt_chim;
goto done;
}
KASSERT(txd->chim_index == HN_NVS_CHIM_IDX_INVALID,
("chimney buffer is used"));
KASSERT(pkt == txd->rndis_pkt, ("RNDIS pkt not in txdesc"));
error = hn_txdesc_dmamap_load(txr, txd, &m_head, segs, &nsegs);
if (error) {