svn commit: r325977 - head/sys/arm/allwinner
Emmanuel Vadot
manu at FreeBSD.org
Sat Nov 18 20:38:06 UTC 2017
Author: manu
Date: Sat Nov 18 20:38:05 2017
New Revision: 325977
URL: https://svnweb.freebsd.org/changeset/base/325977
Log:
if_awg: only request completion interrupt on the last descriptor of a tx frame
The hardware will not issue a completion interrupt for a descriptor
with TX_INT_CTL set if it doesn't also have TX_LAST_DESC set.
Submitted by: Guy Yur <guyyur_gmail.com>
Differential Revision: https://reviews.freebsd.org/D13029
Modified:
head/sys/arm/allwinner/if_awg.c
Modified: head/sys/arm/allwinner/if_awg.c
==============================================================================
--- head/sys/arm/allwinner/if_awg.c Sat Nov 18 20:32:09 2017 (r325976)
+++ head/sys/arm/allwinner/if_awg.c Sat Nov 18 20:38:05 2017 (r325977)
@@ -169,6 +169,7 @@ struct awg_txring {
bus_dma_tag_t buf_tag;
struct awg_bufmap buf_map[TX_DESC_COUNT];
u_int cur, next, queued;
+ u_int segs;
};
struct awg_rxring {
@@ -399,8 +400,6 @@ awg_setup_txdesc(struct awg_softc *sc, int index, int
} else {
status = TX_DESC_CTL;
size = flags | len;
- if ((index & (awg_tx_interval - 1)) == 0)
- size |= TX_INT_CTL;
++sc->tx.queued;
}
@@ -449,8 +448,18 @@ awg_setup_txbuf(struct awg_softc *sc, int index, struc
for (cur = index, i = 0; i < nsegs; i++) {
sc->tx.buf_map[cur].mbuf = (i == 0 ? m : NULL);
- if (i == nsegs - 1)
+ sc->tx.segs++;
+ if (i == nsegs - 1) {
flags |= TX_LAST_DESC;
+ /*
+ * Can only request TX completion
+ * interrupt on last descriptor.
+ */
+ if (sc->tx.segs >= awg_tx_interval) {
+ sc->tx.segs = 0;
+ flags |= TX_INT_CTL;
+ }
+ }
awg_setup_txdesc(sc, cur, flags, segs[i].ds_addr,
segs[i].ds_len);
flags &= ~TX_FIR_DESC;
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