From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:49856) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TfeIR-0006kl-Lm for qemu-devel@nongnu.org; Mon, 03 Dec 2012 17:15:30 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TfeIO-00030I-Pv for qemu-devel@nongnu.org; Mon, 03 Dec 2012 17:15:27 -0500 Sender: fluxion From: Michael Roth Date: Mon, 3 Dec 2012 16:08:35 -0600 Message-Id: <1354572547-21271-12-git-send-email-mdroth@linux.vnet.ibm.com> In-Reply-To: <1354572547-21271-1-git-send-email-mdroth@linux.vnet.ibm.com> References: <1354572547-21271-1-git-send-email-mdroth@linux.vnet.ibm.com> Subject: [Qemu-devel] [PATCH 11/43] e1000: drop check_rxov, always treat RX ring with RDH == RDT as empty List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-stable@nongnu.org Cc: aliguori@us.ibm.com, qemu-devel@nongnu.org From: Dmitry Fleytman Real HW always treats RX ring with RDH == RDT as empty. Emulation is supposed to behave the same. Reported-by: Chris Webb Reported-by: Richard Davies Signed-off-by: Dmitry Fleytman Signed-off-by: Stefan Hajnoczi (cherry picked from commit e5b8b0d4ba29fe1268ba049519a1b0cf8552a21a) Signed-off-by: Michael Roth --- hw/e1000.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/hw/e1000.c b/hw/e1000.c index ec3a7c4..4d4ac32 100644 --- a/hw/e1000.c +++ b/hw/e1000.c @@ -92,7 +92,6 @@ typedef struct E1000State_st { uint32_t rxbuf_size; uint32_t rxbuf_min_shift; - int check_rxov; struct e1000_tx { unsigned char header[256]; unsigned char vlan_header[4]; @@ -741,11 +740,11 @@ static bool e1000_has_rxbufs(E1000State *s, size_t total_size) int bufs; /* Fast-path short packets */ if (total_size <= s->rxbuf_size) { - return s->mac_reg[RDH] != s->mac_reg[RDT] || !s->check_rxov; + return s->mac_reg[RDH] != s->mac_reg[RDT]; } if (s->mac_reg[RDH] < s->mac_reg[RDT]) { bufs = s->mac_reg[RDT] - s->mac_reg[RDH]; - } else if (s->mac_reg[RDH] > s->mac_reg[RDT] || !s->check_rxov) { + } else if (s->mac_reg[RDH] > s->mac_reg[RDT]) { bufs = s->mac_reg[RDLEN] / sizeof(struct e1000_rx_desc) + s->mac_reg[RDT] - s->mac_reg[RDH]; } else { @@ -848,7 +847,6 @@ e1000_receive(NetClientState *nc, const uint8_t *buf, size_t size) if (++s->mac_reg[RDH] * sizeof(desc) >= s->mac_reg[RDLEN]) s->mac_reg[RDH] = 0; - s->check_rxov = 1; /* see comment in start_xmit; same here */ if (s->mac_reg[RDH] == rdh_start) { DBGOUT(RXERR, "RDH wraparound @%x, RDT %x, RDLEN %x\n", @@ -925,7 +923,6 @@ mac_writereg(E1000State *s, int index, uint32_t val) static void set_rdt(E1000State *s, int index, uint32_t val) { - s->check_rxov = 0; s->mac_reg[index] = val & 0xffff; if (e1000_has_rxbufs(s, 1)) { qemu_flush_queued_packets(&s->nic->nc); -- 1.7.9.5