[PART2,1/9] i40e: correctly honor the mask fields for ETHTOOL_SRXCLSRLINS

Submitted by Keller, Jacob E on Feb. 6, 2017, 10:38 p.m.

Details

Message ID 20170206223852.31177-2-jacob.e.keller@intel.com
State Superseded
Delegated to: Jeff Kirsher
Headers show

Commit Message

Keller, Jacob E Feb. 6, 2017, 10:38 p.m.
The current implementation of .set_rxnfc does not properly read the mask
field for filter entries. This results in incorrect driver behavior, as
we do not reject filters which have masks set to ignore some fields. The
current implementation simply assumes that every part of the tuple or
"input set" is specified. This results in filters not behaving as
expected, and not working correctly.

As a first step in supporting some partial filters, add code which
checks the mask fields and rejects any filters which do not have an
acceptable mask. For now, we just assume that all fields must be set.

This will get the driver one step towards allowing some partial filters.
At a minimum, the ethtool commands which previously installed filters
that would not function will now return a non-zero exit code indicating
failure instead.

We should now be meeting the minimum requirements of the .set_rxnfc API,
by ensuring that all filters we program have a valid mask value for each
field.

Finally, add code to report the mask correctly so that the ethtool
command properly reports the mask to the user.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Change-Id: Ia020149e07c87aa3fcec7b2283621b887ef0546f
---
 drivers/net/ethernet/intel/i40e/i40e_ethtool.c | 83 ++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)

Comments

Bowers, AndrewX March 20, 2017, 5:49 p.m.
> -----Original Message-----
> From: Intel-wired-lan [mailto:intel-wired-lan-bounces@lists.osuosl.org] On
> Behalf Of Jacob Keller
> Sent: Monday, February 6, 2017 2:39 PM
> To: Intel Wired LAN <intel-wired-lan@lists.osuosl.org>
> Subject: [Intel-wired-lan] [PART2 PATCH 1/9] i40e: correctly honor the mask
> fields for ETHTOOL_SRXCLSRLINS
> 
> The current implementation of .set_rxnfc does not properly read the mask
> field for filter entries. This results in incorrect driver behavior, as we do not
> reject filters which have masks set to ignore some fields. The current
> implementation simply assumes that every part of the tuple or "input set" is
> specified. This results in filters not behaving as expected, and not working
> correctly.
> 
> As a first step in supporting some partial filters, add code which checks the
> mask fields and rejects any filters which do not have an acceptable mask. For
> now, we just assume that all fields must be set.
> 
> This will get the driver one step towards allowing some partial filters.
> At a minimum, the ethtool commands which previously installed filters that
> would not function will now return a non-zero exit code indicating failure
> instead.
> 
> We should now be meeting the minimum requirements of the .set_rxnfc
> API, by ensuring that all filters we program have a valid mask value for each
> field.
> 
> Finally, add code to report the mask correctly so that the ethtool command
> properly reports the mask to the user.
> 
> Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
> Change-Id: Ia020149e07c87aa3fcec7b2283621b887ef0546f
> ---
>  drivers/net/ethernet/intel/i40e/i40e_ethtool.c | 83
> ++++++++++++++++++++++++++
>  1 file changed, 83 insertions(+)

Tested-by: Andrew Bowers <andrewx.bowers@intel.com>

Patch hide | download patch | download mbox

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index f825181ec7c2..772dd234d581 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -2371,6 +2371,12 @@  static int i40e_get_ethtool_fdir_entry(struct i40e_pf *pf,
 	fsp->h_u.tcp_ip4_spec.ip4src = rule->dst_ip;
 	fsp->h_u.tcp_ip4_spec.ip4dst = rule->src_ip;
 
+	/* Set the mask fields */
+	fsp->m_u.tcp_ip4_spec.psrc = htons(0xFFFF);
+	fsp->m_u.tcp_ip4_spec.pdst = htons(0xFFFF);
+	fsp->m_u.tcp_ip4_spec.ip4src = htonl(0xFFFFFFFF);
+	fsp->m_u.tcp_ip4_spec.ip4dst = htonl(0xFFFFFFFF);
+
 	if (rule->dest_ctl == I40E_FILTER_PROGRAM_DESC_DEST_DROP_PACKET)
 		fsp->ring_cookie = RX_CLS_FLOW_DISC;
 	else
@@ -2679,6 +2685,79 @@  static int i40e_del_fdir_entry(struct i40e_vsi *vsi,
 	return ret;
 }
 
+/**
+ * i40e_check_fdir_input_set - Check that a given rx_flow_spec mask is valid
+ * @fsp: pointer to Rx flow specification
+ *
+ * Ensures that a given ethtool_rx_flow_spec has a valid mask.
+ **/
+static int i40e_check_fdir_input_set(struct ethtool_rx_flow_spec *fsp)
+{
+	struct ethtool_tcpip4_spec *tcp_ip4_spec;
+	struct ethtool_usrip4_spec *usr_ip4_spec;
+
+	/* Verify the provided mask is valid. */
+	switch (fsp->flow_type & ~FLOW_EXT) {
+	case SCTP_V4_FLOW:
+	case TCP_V4_FLOW:
+	case UDP_V4_FLOW:
+		tcp_ip4_spec = &fsp->m_u.tcp_ip4_spec;
+
+		/* IPv4 source address */
+		if (!tcp_ip4_spec->ip4src || ~tcp_ip4_spec->ip4src)
+			return -EOPNOTSUPP;
+
+		/* IPv4 destination address */
+		if (!tcp_ip4_spec->ip4dst || ~tcp_ip4_spec->ip4dst)
+			return -EOPNOTSUPP;
+
+		/* L4 source port */
+		if (!tcp_ip4_spec->psrc || ~tcp_ip4_spec->psrc)
+			return -EOPNOTSUPP;
+
+		/* L4 destination port */
+		if (!tcp_ip4_spec->pdst || ~tcp_ip4_spec->pdst)
+			return -EOPNOTSUPP;
+
+		/* Filtering on Type of Service is not supported. */
+		if (tcp_ip4_spec->tos)
+			return -EOPNOTSUPP;
+
+		break;
+	case IP_USER_FLOW:
+		usr_ip4_spec = &fsp->m_u.usr_ip4_spec;
+
+		/* IPv4 source address */
+		if (!usr_ip4_spec->ip4src || ~usr_ip4_spec->ip4src)
+			return -EOPNOTSUPP;
+
+		/* IPv4 destination address */
+		if (!usr_ip4_spec->ip4dst || ~usr_ip4_spec->ip4dst)
+			return -EOPNOTSUPP;
+
+		/* First 4 bytes of L4 header */
+		if (!usr_ip4_spec->l4_4_bytes || ~usr_ip4_spec->l4_4_bytes)
+			return -EOPNOTSUPP;
+
+		/* Filtering on Type of Service is not supported. */
+		if (usr_ip4_spec->tos)
+			return -EOPNOTSUPP;
+
+		/* IP version does not have a mask field. */
+		if (usr_ip4_spec->ip_ver)
+			return -EINVAL;
+
+		/* L4 protocol doesn't have a mask field. */
+		if (usr_ip4_spec->proto)
+			return -EINVAL;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
 /**
  * i40e_add_fdir_ethtool - Add/Remove Flow Director filters
  * @vsi: pointer to the targeted VSI
@@ -2719,6 +2798,10 @@  static int i40e_add_fdir_ethtool(struct i40e_vsi *vsi,
 	if (fsp->flow_type & FLOW_MAC_EXT)
 		return -EINVAL;
 
+	ret = i40e_check_fdir_input_set(fsp);
+	if (ret)
+		return ret;
+
 	if (fsp->location >= (pf->hw.func_caps.fd_filters_best_effort +
 			      pf->hw.func_caps.fd_filters_guaranteed)) {
 		return -EINVAL;