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Optimize inserting LE for TX checksum computation. Controller does

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not require checksum LE configuration if checksum start and write
position is the same as before. So keep track last checksum start
and write position and insert new LE whenever the position is
changed. This reduces number of LEs used in TX path as well as
slightly enhance TX performance.
This commit is contained in:
Pyun YongHyeon 2010-02-26 18:18:02 +00:00
parent 4858893b6e
commit 1b7757c024
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=204363
2 changed files with 17 additions and 10 deletions
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26
sys/dev/msk/if_msk.c
View File

@ -738,6 +738,7 @@ msk_init_tx_ring(struct msk_if_softc *sc_if)
int i;
sc_if->msk_cdata.msk_tso_mtu = 0;
sc_if->msk_cdata.msk_last_csum = 0;
sc_if->msk_cdata.msk_tx_prod = 0;
sc_if->msk_cdata.msk_tx_cons = 0;
sc_if->msk_cdata.msk_tx_cnt = 0;
@ -2530,7 +2531,7 @@ msk_encap(struct msk_if_softc *sc_if, struct mbuf **m_head)
struct mbuf *m;
bus_dmamap_t map;
bus_dma_segment_t txsegs[MSK_MAXTXSEGS];
uint32_t control, prod, si;
uint32_t control, csum, prod, si;
uint16_t offset, tcp_offset, tso_mtu;
int error, i, nseg, tso;
@ -2709,17 +2710,22 @@ msk_encap(struct msk_if_softc *sc_if, struct mbuf **m_head)
if ((sc_if->msk_flags & MSK_FLAG_AUTOTX_CSUM) != 0)
control |= CALSUM;
else {
tx_le = &sc_if->msk_rdata.msk_tx_ring[prod];
tx_le->msk_addr = htole32(((tcp_offset +
m->m_pkthdr.csum_data) & 0xffff) |
((uint32_t)tcp_offset << 16));
tx_le->msk_control = htole32(1 << 16 |
(OP_TCPLISW | HW_OWNER));
control = CALSUM | WR_SUM | INIT_SUM | LOCK_SUM;
control |= CALSUM | WR_SUM | INIT_SUM | LOCK_SUM;
if ((m->m_pkthdr.csum_flags & CSUM_UDP) != 0)
control |= UDPTCP;
sc_if->msk_cdata.msk_tx_cnt++;
MSK_INC(prod, MSK_TX_RING_CNT);
/* Checksum write position. */
csum = (tcp_offset + m->m_pkthdr.csum_data) & 0xffff;
/* Checksum start position. */
csum |= (uint32_t)tcp_offset << 16;
if (csum != sc_if->msk_cdata.msk_last_csum) {
tx_le = &sc_if->msk_rdata.msk_tx_ring[prod];
tx_le->msk_addr = htole32(csum);
tx_le->msk_control = htole32(1 << 16 |
(OP_TCPLISW | HW_OWNER));
sc_if->msk_cdata.msk_tx_cnt++;
MSK_INC(prod, MSK_TX_RING_CNT);
sc_if->msk_cdata.msk_last_csum = csum;
}
}
}

1
sys/dev/msk/if_mskreg.h
View File

@ -2361,6 +2361,7 @@ struct msk_chain_data {
bus_dmamap_t msk_jumbo_rx_ring_map;
bus_dmamap_t msk_jumbo_rx_sparemap;
uint16_t msk_tso_mtu;
uint32_t msk_last_csum;
int msk_tx_prod;
int msk_tx_cons;
int msk_tx_cnt;