From f1e7cb1388e46eac8285854af2abdfde41ffa226 Mon Sep 17 00:00:00 2001 From: Ramon Fried Date: Fri, 17 Apr 2020 20:17:36 +0300 Subject: Cadence: gem: fix wraparound in 64bit descriptors Wraparound of TX descriptor cyclic buffer only updated the low 32 bits of the descriptor. Fix that by checking if we're working with 64bit descriptors. Signed-off-by: Ramon Fried Reviewed-by: Edgar E. Iglesias Message-id: 20200417171736.441607-1-rfried.dev@gmail.com Signed-off-by: Peter Maydell --- hw/net/cadence_gem.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/hw/net/cadence_gem.c b/hw/net/cadence_gem.c index 51ec5a0..b7b7985 100644 --- a/hw/net/cadence_gem.c +++ b/hw/net/cadence_gem.c @@ -1238,7 +1238,14 @@ static void gem_transmit(CadenceGEMState *s) /* read next descriptor */ if (tx_desc_get_wrap(desc)) { tx_desc_set_last(desc); - packet_desc_addr = s->regs[GEM_TXQBASE]; + + if (s->regs[GEM_DMACFG] & GEM_DMACFG_ADDR_64B) { + packet_desc_addr = s->regs[GEM_TBQPH]; + packet_desc_addr <<= 32; + } else { + packet_desc_addr = 0; + } + packet_desc_addr |= s->regs[GEM_TXQBASE]; } else { packet_desc_addr += 4 * gem_get_desc_len(s, false); } -- cgit v1.1