diff mbox series

[net-next,v2,05/14] sfc: check ef100 RX packets are from the wire

Message ID f2baf235d2e32d2195611b230a576839871702b5.1658943677.git.ecree.xilinx@gmail.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series sfc: VF representors for EF100 - RX side | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1 this patch: 1
netdev/cc_maintainers warning 2 maintainers not CCed: edumazet@google.com habetsm.xilinx@gmail.com
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1 this patch: 1
netdev/checkpatch warning CHECK: No space is necessary after a cast WARNING: line length of 85 exceeds 80 columns
netdev/kdoc success Errors and warnings before: 57 this patch: 57
netdev/source_inline success Was 0 now: 0

Commit Message

ecree@xilinx.com July 27, 2022, 5:45 p.m. UTC 
From: Edward Cree <ecree.xilinx@gmail.com>

If not, for now drop them and warn.  A subsequent patch will look up
 the source m-port to try and find a representor to deliver them to.

Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
---
 drivers/net/ethernet/sfc/ef100_rx.c       | 28 ++++++++++++++++++-----
 drivers/net/ethernet/sfc/ethtool_common.c |  1 +
 drivers/net/ethernet/sfc/net_driver.h     |  3 +++
 3 files changed, 26 insertions(+), 6 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/sfc/ef100_rx.c b/drivers/net/ethernet/sfc/ef100_rx.c
index 85207acf7dee..b8da9e3b7bf2 100644
--- a/drivers/net/ethernet/sfc/ef100_rx.c
+++ b/drivers/net/ethernet/sfc/ef100_rx.c
@@ -55,10 +55,14 @@  static bool ef100_has_fcs_error(struct efx_channel *channel, u32 *prefix)
 
 void __ef100_rx_packet(struct efx_channel *channel)
 {
-	struct efx_rx_buffer *rx_buf = efx_rx_buffer(&channel->rx_queue, channel->rx_pkt_index);
+	struct efx_rx_queue *rx_queue = efx_channel_get_rx_queue(channel);
+	struct efx_rx_buffer *rx_buf = efx_rx_buffer(rx_queue,
+						     channel->rx_pkt_index);
 	struct efx_nic *efx = channel->efx;
+	struct ef100_nic_data *nic_data;
 	u8 *eh = efx_rx_buf_va(rx_buf);
 	__wsum csum = 0;
+	u16 ing_port;
 	u32 *prefix;
 
 	prefix = (u32 *)(eh - ESE_GZ_RX_PKT_PREFIX_LEN);
@@ -76,6 +80,19 @@  void __ef100_rx_packet(struct efx_channel *channel)
 		goto out;
 	}
 
+	ing_port = le16_to_cpu((__force __le16) PREFIX_FIELD(prefix, INGRESS_MPORT));
+
+	nic_data = efx->nic_data;
+
+	if (nic_data->have_mport && ing_port != nic_data->base_mport) {
+		if (net_ratelimit())
+			netif_warn(efx, drv, efx->net_dev,
+				   "Unrecognised ing_port %04x (base %04x), dropping\n",
+				   ing_port, nic_data->base_mport);
+		channel->n_rx_mport_bad++;
+		goto free_rx_buffer;
+	}
+
 	if (likely(efx->net_dev->features & NETIF_F_RXCSUM)) {
 		if (PREFIX_FIELD(prefix, NT_OR_INNER_L3_CLASS) == 1) {
 			++channel->n_rx_ip_hdr_chksum_err;
@@ -87,17 +104,16 @@  void __ef100_rx_packet(struct efx_channel *channel)
 	}
 
 	if (channel->type->receive_skb) {
-		struct efx_rx_queue *rx_queue =
-			efx_channel_get_rx_queue(channel);
-
 		/* no support for special channels yet, so just discard */
 		WARN_ON_ONCE(1);
-		efx_free_rx_buffers(rx_queue, rx_buf, 1);
-		goto out;
+		goto free_rx_buffer;
 	}
 
 	efx_rx_packet_gro(channel, rx_buf, channel->rx_pkt_n_frags, eh, csum);
+	goto out;
 
+free_rx_buffer:
+	efx_free_rx_buffers(rx_queue, rx_buf, 1);
 out:
 	channel->rx_pkt_n_frags = 0;
 }
diff --git a/drivers/net/ethernet/sfc/ethtool_common.c b/drivers/net/ethernet/sfc/ethtool_common.c
index 58ad9d665805..bc840ede3053 100644
--- a/drivers/net/ethernet/sfc/ethtool_common.c
+++ b/drivers/net/ethernet/sfc/ethtool_common.c
@@ -91,6 +91,7 @@  static const struct efx_sw_stat_desc efx_sw_stat_desc[] = {
 	EFX_ETHTOOL_UINT_CHANNEL_STAT(rx_xdp_bad_drops),
 	EFX_ETHTOOL_UINT_CHANNEL_STAT(rx_xdp_tx),
 	EFX_ETHTOOL_UINT_CHANNEL_STAT(rx_xdp_redirect),
+	EFX_ETHTOOL_UINT_CHANNEL_STAT(rx_mport_bad),
 #ifdef CONFIG_RFS_ACCEL
 	EFX_ETHTOOL_UINT_CHANNEL_STAT_NO_N(rfs_filter_count),
 	EFX_ETHTOOL_UINT_CHANNEL_STAT(rfs_succeeded),
diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
index 4cde54cf77b9..6b64ba3a7d36 100644
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -478,6 +478,8 @@  enum efx_sync_events_state {
  * @n_rx_xdp_bad_drops: Count of RX packets dropped due to XDP errors
  * @n_rx_xdp_tx: Count of RX packets retransmitted due to XDP
  * @n_rx_xdp_redirect: Count of RX packets redirected to a different NIC by XDP
+ * @n_rx_mport_bad: Count of RX packets dropped because their ingress mport was
+ *	not recognised
  * @rx_pkt_n_frags: Number of fragments in next packet to be delivered by
  *	__efx_rx_packet(), or zero if there is none
  * @rx_pkt_index: Ring index of first buffer for next packet to be delivered
@@ -540,6 +542,7 @@  struct efx_channel {
 	unsigned int n_rx_xdp_bad_drops;
 	unsigned int n_rx_xdp_tx;
 	unsigned int n_rx_xdp_redirect;
+	unsigned int n_rx_mport_bad;
 
 	unsigned int rx_pkt_n_frags;
 	unsigned int rx_pkt_index;