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Message-ID: <20240506070453.17054-4-darinzon@amazon.com>
Date: Mon, 6 May 2024 07:04:50 +0000
From: <darinzon@...zon.com>
To: David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
<netdev@...r.kernel.org>
CC: David Arinzon <darinzon@...zon.com>, "Woodhouse, David" <dwmw@...zon.com>,
"Machulsky, Zorik" <zorik@...zon.com>, "Matushevsky, Alexander"
<matua@...zon.com>, Saeed Bshara <saeedb@...zon.com>, "Wilson, Matt"
<msw@...zon.com>, "Liguori, Anthony" <aliguori@...zon.com>, "Bshara, Nafea"
<nafea@...zon.com>, "Belgazal, Netanel" <netanel@...zon.com>, "Saidi, Ali"
<alisaidi@...zon.com>, "Herrenschmidt, Benjamin" <benh@...zon.com>,
"Kiyanovski, Arthur" <akiyano@...zon.com>, "Dagan, Noam" <ndagan@...zon.com>,
"Agroskin, Shay" <shayagr@...zon.com>, "Itzko, Shahar" <itzko@...zon.com>,
"Abboud, Osama" <osamaabb@...zon.com>, "Ostrovsky, Evgeny"
<evostrov@...zon.com>, "Tabachnik, Ofir" <ofirt@...zon.com>
Subject: [PATCH v1 net-next 3/6] net: ena: Add validation for completion descriptors consistency
From: David Arinzon <darinzon@...zon.com>
Validate that `first` flag is set only for the first
descriptor in multi-buffer packets.
In case of an invalid descriptor, a reset will occur.
A new reset reason for RX data corruption has been added.
Signed-off-by: Shahar Itzko <itzko@...zon.com>
Signed-off-by: David Arinzon <darinzon@...zon.com>
---
drivers/net/ethernet/amazon/ena/ena_eth_com.c | 37 ++++++++++++++-----
drivers/net/ethernet/amazon/ena/ena_netdev.c | 2 +
.../net/ethernet/amazon/ena/ena_regs_defs.h | 1 +
3 files changed, 30 insertions(+), 10 deletions(-)
diff --git a/drivers/net/ethernet/amazon/ena/ena_eth_com.c b/drivers/net/ethernet/amazon/ena/ena_eth_com.c
index 933e619b..4c6e07aa 100644
--- a/drivers/net/ethernet/amazon/ena/ena_eth_com.c
+++ b/drivers/net/ethernet/amazon/ena/ena_eth_com.c
@@ -229,30 +229,43 @@ static struct ena_eth_io_rx_cdesc_base *
idx * io_cq->cdesc_entry_size_in_bytes);
}
-static u16 ena_com_cdesc_rx_pkt_get(struct ena_com_io_cq *io_cq,
- u16 *first_cdesc_idx)
+static int ena_com_cdesc_rx_pkt_get(struct ena_com_io_cq *io_cq,
+ u16 *first_cdesc_idx,
+ u16 *num_descs)
{
+ u16 count = io_cq->cur_rx_pkt_cdesc_count, head_masked;
struct ena_eth_io_rx_cdesc_base *cdesc;
- u16 count = 0, head_masked;
u32 last = 0;
do {
+ u32 status;
+
cdesc = ena_com_get_next_rx_cdesc(io_cq);
if (!cdesc)
break;
+ status = READ_ONCE(cdesc->status);
ena_com_cq_inc_head(io_cq);
+ if (unlikely((status & ENA_ETH_IO_RX_CDESC_BASE_FIRST_MASK) >>
+ ENA_ETH_IO_RX_CDESC_BASE_FIRST_SHIFT && count != 0)) {
+ struct ena_com_dev *dev = ena_com_io_cq_to_ena_dev(io_cq);
+
+ netdev_err(dev->net_device,
+ "First bit is on in descriptor #%d on q_id: %d, req_id: %u\n",
+ count, io_cq->qid, cdesc->req_id);
+ return -EFAULT;
+ }
count++;
- last = (READ_ONCE(cdesc->status) & ENA_ETH_IO_RX_CDESC_BASE_LAST_MASK) >>
- ENA_ETH_IO_RX_CDESC_BASE_LAST_SHIFT;
+ last = (status & ENA_ETH_IO_RX_CDESC_BASE_LAST_MASK) >>
+ ENA_ETH_IO_RX_CDESC_BASE_LAST_SHIFT;
} while (!last);
if (last) {
*first_cdesc_idx = io_cq->cur_rx_pkt_cdesc_start_idx;
- count += io_cq->cur_rx_pkt_cdesc_count;
head_masked = io_cq->head & (io_cq->q_depth - 1);
+ *num_descs = count;
io_cq->cur_rx_pkt_cdesc_count = 0;
io_cq->cur_rx_pkt_cdesc_start_idx = head_masked;
@@ -260,11 +273,11 @@ static u16 ena_com_cdesc_rx_pkt_get(struct ena_com_io_cq *io_cq,
"ENA q_id: %d packets were completed. first desc idx %u descs# %d\n",
io_cq->qid, *first_cdesc_idx, count);
} else {
- io_cq->cur_rx_pkt_cdesc_count += count;
- count = 0;
+ io_cq->cur_rx_pkt_cdesc_count = count;
+ *num_descs = 0;
}
- return count;
+ return 0;
}
static int ena_com_create_meta(struct ena_com_io_sq *io_sq,
@@ -539,10 +552,14 @@ int ena_com_rx_pkt(struct ena_com_io_cq *io_cq,
u16 cdesc_idx = 0;
u16 nb_hw_desc;
u16 i = 0;
+ int rc;
WARN(io_cq->direction != ENA_COM_IO_QUEUE_DIRECTION_RX, "wrong Q type");
- nb_hw_desc = ena_com_cdesc_rx_pkt_get(io_cq, &cdesc_idx);
+ rc = ena_com_cdesc_rx_pkt_get(io_cq, &cdesc_idx, &nb_hw_desc);
+ if (unlikely(rc != 0))
+ return -EFAULT;
+
if (nb_hw_desc == 0) {
ena_rx_ctx->descs = nb_hw_desc;
return 0;
diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
index 683088af..c17a9833 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -1347,6 +1347,8 @@ error:
if (rc == -ENOSPC) {
ena_increase_stat(&rx_ring->rx_stats.bad_desc_num, 1, &rx_ring->syncp);
ena_reset_device(adapter, ENA_REGS_RESET_TOO_MANY_RX_DESCS);
+ } else if (rc == -EFAULT) {
+ ena_reset_device(adapter, ENA_REGS_RESET_RX_DESCRIPTOR_MALFORMED);
} else {
ena_increase_stat(&rx_ring->rx_stats.bad_req_id, 1,
&rx_ring->syncp);
diff --git a/drivers/net/ethernet/amazon/ena/ena_regs_defs.h b/drivers/net/ethernet/amazon/ena/ena_regs_defs.h
index 2c3d6a77..a2efebaf 100644
--- a/drivers/net/ethernet/amazon/ena/ena_regs_defs.h
+++ b/drivers/net/ethernet/amazon/ena/ena_regs_defs.h
@@ -22,6 +22,7 @@ enum ena_regs_reset_reason_types {
ENA_REGS_RESET_GENERIC = 13,
ENA_REGS_RESET_MISS_INTERRUPT = 14,
ENA_REGS_RESET_SUSPECTED_POLL_STARVATION = 15,
+ ENA_REGS_RESET_RX_DESCRIPTOR_MALFORMED = 16,
};
/* ena_registers offsets */
--
2.40.1
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