From: Dmitry Bezrukov dbezrukov@marvell.com
commit 15beab0a9d797be1b7c67458da007a62269be29a upstream.
Yet another checksum offload compatibility issue was found.
The known issue is that AQC HW marks tcp packets with 0xFFFF checksum as invalid (1). This is workarounded in driver, passing all the suspicious packets up to the stack for further csum validation.
Another HW problem (2) is that it hides invalid csum of LRO aggregated packets inside of the individual descriptors. That was workarounded by forced scan of all LRO descriptors for checksum errors.
However the scan logic was joint for both LRO and multi-descriptor packets (jumbos). And this causes the issue.
We have to drop LRO packets with the detected bad checksum because of (2), but we have to pass jumbo packets to stack because of (1).
When using windows tcp partner with jumbo frames but with LSO disabled driver discards such frames as bad checksummed. But only LRO frames should be dropped, not jumbos.
On such a configurations tcp stream have a chance of drops and stucks.
(1) 76f254d4afe2 ("net: aquantia: tcp checksum 0xffff being handled incorrectly") (2) d08b9a0a3ebd ("net: aquantia: do not pass lro session with invalid tcp checksum")
Fixes: d08b9a0a3ebd ("net: aquantia: do not pass lro session with invalid tcp checksum") Signed-off-by: Dmitry Bezrukov dbezrukov@marvell.com Signed-off-by: Igor Russkikh irusskikh@marvell.com Signed-off-by: Dmitry Bogdanov dbogdanov@marvell.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/net/ethernet/aquantia/atlantic/aq_ring.c | 3 ++- drivers/net/ethernet/aquantia/atlantic/aq_ring.h | 3 ++- drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c | 5 +++-- 3 files changed, 7 insertions(+), 4 deletions(-)
--- a/drivers/net/ethernet/aquantia/atlantic/aq_ring.c +++ b/drivers/net/ethernet/aquantia/atlantic/aq_ring.c @@ -351,7 +351,8 @@ int aq_ring_rx_clean(struct aq_ring_s *s err = 0; goto err_exit; } - if (buff->is_error || buff->is_cso_err) { + if (buff->is_error || + (buff->is_lro && buff->is_cso_err)) { buff_ = buff; do { next_ = buff_->next, --- a/drivers/net/ethernet/aquantia/atlantic/aq_ring.h +++ b/drivers/net/ethernet/aquantia/atlantic/aq_ring.h @@ -78,7 +78,8 @@ struct __packed aq_ring_buff_s { u32 is_cleaned:1; u32 is_error:1; u32 is_vlan:1; - u32 rsvd3:4; + u32 is_lro:1; + u32 rsvd3:3; u16 eop_index; u16 rsvd4; }; --- a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c +++ b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c @@ -823,6 +823,8 @@ static int hw_atl_b0_hw_ring_rx_receive( } }
+ buff->is_lro = !!(HW_ATL_B0_RXD_WB_STAT2_RSCCNT & + rxd_wb->status); if (HW_ATL_B0_RXD_WB_STAT2_EOP & rxd_wb->status) { buff->len = rxd_wb->pkt_len % AQ_CFG_RX_FRAME_MAX; @@ -835,8 +837,7 @@ static int hw_atl_b0_hw_ring_rx_receive( rxd_wb->pkt_len > AQ_CFG_RX_FRAME_MAX ? AQ_CFG_RX_FRAME_MAX : rxd_wb->pkt_len;
- if (HW_ATL_B0_RXD_WB_STAT2_RSCCNT & - rxd_wb->status) { + if (buff->is_lro) { /* LRO */ buff->next = rxd_wb->next_desc_ptr; ++ring->stats.rx.lro_packets;