From: Finn Thain Date: Wed, 29 Jan 2020 09:27:49 +0000 (+1100) Subject: dp8393x: Clear descriptor in_use field to release packet X-Git-Tag: qemu-xen-4.14.0~113^2~12 X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=d9fae13196a31716f45dcddcdd958fbb8e59b35a;p=qemu-xen.git dp8393x: Clear descriptor in_use field to release packet When the SONIC receives a packet into the last available descriptor, it retains ownership of that descriptor for as long as necessary. Section 3.4.7 of the datasheet says, When the system appends more descriptors, the SONIC releases ownership of the descriptor after writing 0000h to the RXpkt.in_use field. The packet can now be processed by the host, so raise a PKTRX interrupt, just like the normal case. Signed-off-by: Finn Thain Tested-by: Laurent Vivier Signed-off-by: Jason Wang --- diff --git a/hw/net/dp8393x.c b/hw/net/dp8393x.c index 22b4d362e2..08194a4968 100644 --- a/hw/net/dp8393x.c +++ b/hw/net/dp8393x.c @@ -811,7 +811,17 @@ static ssize_t dp8393x_receive(NetClientState *nc, const uint8_t * buf, return -1; } /* Link has been updated by host */ + + /* Clear in_use */ + size = sizeof(uint16_t) * width; + address = dp8393x_crda(s) + sizeof(uint16_t) * 6 * width; + dp8393x_put(s, width, 0, 0); + address_space_rw(&s->as, address, MEMTXATTRS_UNSPECIFIED, + (uint8_t *)s->data, size, 1); + + /* Move to next descriptor */ s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA]; + s->regs[SONIC_ISR] |= SONIC_ISR_PKTRX; } /* Save current position */