[PATCH net-next,v5 12/12] qede: use ethtool_rx_flow_rule() to remove duplicated parser code

Pablo Neira Ayuso
2018-12-06T22:41:05Z

The qede driver supports for ethtool_rx_flow_spec and flower, both
codebases look very similar.

This patch uses the ethtool_rx_flow_rule() infrastructure to remove the
duplicated ethtool_rx_flow_spec parser and consolidate ACL offload
support around the flow_rule infrastructure.

Furthermore, more code can be consolidated by merging
qede_add_cls_rule() and qede_add_tc_flower_fltr(), these two functions
also look very similar.

This driver currently provides simple ACL support, such as 5-tuple
matching, drop policy and queue to CPU.

Drivers that support more features can benefit from this infrastructure
to save even more redundant codebase.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
v5: rebase on top of net-next head.

drivers/net/ethernet/qlogic/qede/qede_filter.c | 279 +++++++------------------
1 file changed, 76 insertions(+), 203 deletions(-)

diff --git a/drivers/net/ethernet/qlogic/qede/qede_filter.c b/drivers/net/ethernet/qlogic/qede/qede_filter.c
index ed77950f6cf9..37c0651184ce 100644
--- a/drivers/net/ethernet/qlogic/qede/qede_filter.c
+++ b/drivers/net/ethernet/qlogic/qede/qede_filter.c
@@ -1665,132 +1665,6 @@ static int qede_set_v6_tuple_to_profile(struct qede_dev *edev,
return 0;
}

-static int qede_flow_spec_to_tuple_ipv4_common(struct qede_dev *edev,
- struct qede_arfs_tuple *t,
- struct ethtool_rx_flow_spec *fs)
-{
- if ((fs->h_u.tcp_ip4_spec.ip4src &
- fs->m_u.tcp_ip4_spec.ip4src) != fs->h_u.tcp_ip4_spec.ip4src) {
- DP_INFO(edev, "Don't support IP-masks\n");
- return -EOPNOTSUPP;
- }
-
- if ((fs->h_u.tcp_ip4_spec.ip4dst &
- fs->m_u.tcp_ip4_spec.ip4dst) != fs->h_u.tcp_ip4_spec.ip4dst) {
- DP_INFO(edev, "Don't support IP-masks\n");
- return -EOPNOTSUPP;
- }
-
- if ((fs->h_u.tcp_ip4_spec.psrc &
- fs->m_u.tcp_ip4_spec.psrc) != fs->h_u.tcp_ip4_spec.psrc) {
- DP_INFO(edev, "Don't support port-masks\n");
- return -EOPNOTSUPP;
- }
-
- if ((fs->h_u.tcp_ip4_spec.pdst &
- fs->m_u.tcp_ip4_spec.pdst) != fs->h_u.tcp_ip4_spec.pdst) {
- DP_INFO(edev, "Don't support port-masks\n");
- return -EOPNOTSUPP;
- }
-
- if (fs->h_u.tcp_ip4_spec.tos) {
- DP_INFO(edev, "Don't support tos\n");
- return -EOPNOTSUPP;
- }
-
- t->eth_proto = htons(ETH_P_IP);
- t->src_ipv4 = fs->h_u.tcp_ip4_spec.ip4src;
- t->dst_ipv4 = fs->h_u.tcp_ip4_spec.ip4dst;
- t->src_port = fs->h_u.tcp_ip4_spec.psrc;
- t->dst_port = fs->h_u.tcp_ip4_spec.pdst;
-
- return qede_set_v4_tuple_to_profile(edev, t);
-}
-
-static int qede_flow_spec_to_tuple_tcpv4(struct qede_dev *edev,
- struct qede_arfs_tuple *t,
- struct ethtool_rx_flow_spec *fs)
-{
- t->ip_proto = IPPROTO_TCP;
-
- if (qede_flow_spec_to_tuple_ipv4_common(edev, t, fs))
- return -EINVAL;
-
- return 0;
-}
-
-static int qede_flow_spec_to_tuple_udpv4(struct qede_dev *edev,
- struct qede_arfs_tuple *t,
- struct ethtool_rx_flow_spec *fs)
-{
- t->ip_proto = IPPROTO_UDP;
-
- if (qede_flow_spec_to_tuple_ipv4_common(edev, t, fs))
- return -EINVAL;
-
- return 0;
-}
-
-static int qede_flow_spec_to_tuple_ipv6_common(struct qede_dev *edev,
- struct qede_arfs_tuple *t,
- struct ethtool_rx_flow_spec *fs)
-{
- struct in6_addr zero_addr;
-
- memset(&zero_addr, 0, sizeof(zero_addr));
-
- if ((fs->h_u.tcp_ip6_spec.psrc &
- fs->m_u.tcp_ip6_spec.psrc) != fs->h_u.tcp_ip6_spec.psrc) {
- DP_INFO(edev, "Don't support port-masks\n");
- return -EOPNOTSUPP;
- }
-
- if ((fs->h_u.tcp_ip6_spec.pdst &
- fs->m_u.tcp_ip6_spec.pdst) != fs->h_u.tcp_ip6_spec.pdst) {
- DP_INFO(edev, "Don't support port-masks\n");
- return -EOPNOTSUPP;
- }
-
- if (fs->h_u.tcp_ip6_spec.tclass) {
- DP_INFO(edev, "Don't support tclass\n");
- return -EOPNOTSUPP;
- }
-
- t->eth_proto = htons(ETH_P_IPV6);
- memcpy(&t->src_ipv6, &fs->h_u.tcp_ip6_spec.ip6src,
- sizeof(struct in6_addr));
- memcpy(&t->dst_ipv6, &fs->h_u.tcp_ip6_spec.ip6dst,
- sizeof(struct in6_addr));
- t->src_port = fs->h_u.tcp_ip6_spec.psrc;
- t->dst_port = fs->h_u.tcp_ip6_spec.pdst;
-
- return qede_set_v6_tuple_to_profile(edev, t, &zero_addr);
-}
-
-static int qede_flow_spec_to_tuple_tcpv6(struct qede_dev *edev,
- struct qede_arfs_tuple *t,
- struct ethtool_rx_flow_spec *fs)
-{
- t->ip_proto = IPPROTO_TCP;
-
- if (qede_flow_spec_to_tuple_ipv6_common(edev, t, fs))
- return -EINVAL;
-
- return 0;
-}
-
-static int qede_flow_spec_to_tuple_udpv6(struct qede_dev *edev,
- struct qede_arfs_tuple *t,
- struct ethtool_rx_flow_spec *fs)
-{
- t->ip_proto = IPPROTO_UDP;
-
- if (qede_flow_spec_to_tuple_ipv6_common(edev, t, fs))
- return -EINVAL;
-
- return 0;
-}
-
/* Must be called while qede lock is held */
static struct qede_arfs_fltr_node *
qede_flow_find_fltr(struct qede_dev *edev, struct qede_arfs_tuple *t)
@@ -1875,34 +1749,38 @@ static int qede_parse_actions(struct qede_dev *edev,
struct flow_action *flow_action)
{
const struct flow_action_entry *act;
- int rc = -EINVAL, num_act = 0, i;
- bool is_drop = false;
+ int i;

if (!flow_action_has_entries(flow_action)) {
- DP_NOTICE(edev, "No tc actions received\n");
- return rc;
+ DP_NOTICE(edev, "No actions received\n");
+ return -EINVAL;
}

flow_action_for_each(i, act, flow_action) {
- num_act++;
+ switch (act->id) {
+ case FLOW_ACTION_DROP:
+ break;
+ case FLOW_ACTION_QUEUE:
+ if (ethtool_get_flow_spec_ring_vf(act->queue.index))
+ break;

- if (act->id == FLOW_ACTION_DROP)
- is_drop = true;
+ if (act->queue.index >= QEDE_RSS_COUNT(edev)) {
+ DP_INFO(edev, "Queue out-of-bounds\n");
+ return -EINVAL;
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
}

- if (num_act == 1 && is_drop)
- return 0;
-
- return rc;
+ return 0;
}

static int
-qede_tc_parse_ports(struct qede_dev *edev,
- struct tc_cls_flower_offload *f,
- struct qede_arfs_tuple *t)
+qede_flow_parse_ports(struct qede_dev *edev, struct flow_rule *rule,
+ struct qede_arfs_tuple *t)
{
- struct flow_rule *rule = tc_cls_flower_offload_flow_rule(f);
-
if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PORTS)) {
struct flow_match_ports match;

@@ -1921,11 +1799,9 @@ qede_tc_parse_ports(struct qede_dev *edev,
}

static int
-qede_tc_parse_v6_common(struct qede_dev *edev,
- struct tc_cls_flower_offload *f,
- struct qede_arfs_tuple *t)
+qede_flow_parse_v6_common(struct qede_dev *edev, struct flow_rule *rule,
+ struct qede_arfs_tuple *t)
{
- struct flow_rule *rule = tc_cls_flower_offload_flow_rule(f);
struct in6_addr zero_addr, addr;

memset(&zero_addr, 0, sizeof(addr));
@@ -1948,19 +1824,16 @@ qede_tc_parse_v6_common(struct qede_dev *edev,
memcpy(&t->dst_ipv6, &match.key->dst, sizeof(addr));
}

- if (qede_tc_parse_ports(edev, f, t))
+ if (qede_flow_parse_ports(edev, rule, t))
return -EINVAL;

return qede_set_v6_tuple_to_profile(edev, t, &zero_addr);
}

static int
-qede_tc_parse_v4_common(struct qede_dev *edev,
- struct tc_cls_flower_offload *f,
+qede_flow_parse_v4_common(struct qede_dev *edev, struct flow_rule *rule,
struct qede_arfs_tuple *t)
{
- struct flow_rule *rule = tc_cls_flower_offload_flow_rule(f);
-
if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
struct flow_match_ipv4_addrs match;

@@ -1975,62 +1848,56 @@ qede_tc_parse_v4_common(struct qede_dev *edev,
t->dst_ipv4 = match.key->dst;
}

- if (qede_tc_parse_ports(edev, f, t))
+ if (qede_flow_parse_ports(edev, rule, t))
return -EINVAL;

return qede_set_v4_tuple_to_profile(edev, t);
}

static int
-qede_tc_parse_tcp_v6(struct qede_dev *edev,
- struct tc_cls_flower_offload *f,
+qede_flow_parse_tcp_v6(struct qede_dev *edev, struct flow_rule *rule,
struct qede_arfs_tuple *tuple)
{
tuple->ip_proto = IPPROTO_TCP;
tuple->eth_proto = htons(ETH_P_IPV6);

- return qede_tc_parse_v6_common(edev, f, tuple);
+ return qede_flow_parse_v6_common(edev, rule, tuple);
}

static int
-qede_tc_parse_tcp_v4(struct qede_dev *edev,
- struct tc_cls_flower_offload *f,
+qede_flow_parse_tcp_v4(struct qede_dev *edev, struct flow_rule *rule,
struct qede_arfs_tuple *tuple)
{
tuple->ip_proto = IPPROTO_TCP;
tuple->eth_proto = htons(ETH_P_IP);

- return qede_tc_parse_v4_common(edev, f, tuple);
+ return qede_flow_parse_v4_common(edev, rule, tuple);
}

static int
-qede_tc_parse_udp_v6(struct qede_dev *edev,
- struct tc_cls_flower_offload *f,
+qede_flow_parse_udp_v6(struct qede_dev *edev, struct flow_rule *rule,
struct qede_arfs_tuple *tuple)
{
tuple->ip_proto = IPPROTO_UDP;
tuple->eth_proto = htons(ETH_P_IPV6);

- return qede_tc_parse_v6_common(edev, f, tuple);
+ return qede_flow_parse_v6_common(edev, rule, tuple);
}

static int
-qede_tc_parse_udp_v4(struct qede_dev *edev,
- struct tc_cls_flower_offload *f,
+qede_flow_parse_udp_v4(struct qede_dev *edev, struct flow_rule *rule,
struct qede_arfs_tuple *tuple)
{
tuple->ip_proto = IPPROTO_UDP;
tuple->eth_proto = htons(ETH_P_IP);

- return qede_tc_parse_v4_common(edev, f, tuple);
+ return qede_flow_parse_v4_common(edev, rule, tuple);
}

static int
-qede_parse_flower_attr(struct qede_dev *edev, __be16 proto,
- struct tc_cls_flower_offload *f,
- struct qede_arfs_tuple *tuple)
+qede_parse_flow_attr(struct qede_dev *edev, __be16 proto,
+ struct flow_rule *rule, struct qede_arfs_tuple *tuple)
{
- struct flow_rule *rule = tc_cls_flower_offload_flow_rule(f);
struct flow_dissector *dissector = rule->match.dissector;
int rc = -EINVAL;
u8 ip_proto = 0;
@@ -2062,15 +1929,15 @@ qede_parse_flower_attr(struct qede_dev *edev, __be16 proto,
}

if (ip_proto == IPPROTO_TCP && proto == htons(ETH_P_IP))
- rc = qede_tc_parse_tcp_v4(edev, f, tuple);
+ rc = qede_flow_parse_tcp_v4(edev, rule, tuple);
else if (ip_proto == IPPROTO_TCP && proto == htons(ETH_P_IPV6))
- rc = qede_tc_parse_tcp_v6(edev, f, tuple);
+ rc = qede_flow_parse_tcp_v6(edev, rule, tuple);
else if (ip_proto == IPPROTO_UDP && proto == htons(ETH_P_IP))
- rc = qede_tc_parse_udp_v4(edev, f, tuple);
+ rc = qede_flow_parse_udp_v4(edev, rule, tuple);
else if (ip_proto == IPPROTO_UDP && proto == htons(ETH_P_IPV6))
- rc = qede_tc_parse_udp_v6(edev, f, tuple);
+ rc = qede_flow_parse_udp_v6(edev, rule, tuple);
else
- DP_NOTICE(edev, "Invalid tc protocol request\n");
+ DP_NOTICE(edev, "Invalid protocol request\n");

return rc;
}
@@ -2090,7 +1957,7 @@ int qede_add_tc_flower_fltr(struct qede_dev *edev, __be16 proto,
}

/* parse flower attribute and prepare filter */
- if (qede_parse_flower_attr(edev, proto, f, &t))
+ if (qede_parse_flow_attr(edev, proto, f->rule, &t))
goto unlock;

/* Validate profile mode and number of filters */
@@ -2147,16 +2014,17 @@ int qede_add_tc_flower_fltr(struct qede_dev *edev, __be16 proto,
}

static int qede_flow_spec_validate(struct qede_dev *edev,
- struct ethtool_rx_flow_spec *fs,
- struct qede_arfs_tuple *t)
+ struct flow_action *flow_action,
+ struct qede_arfs_tuple *t,
+ __u32 location)
{
- if (fs->location >= QEDE_RFS_MAX_FLTR) {
+ if (location >= QEDE_RFS_MAX_FLTR) {
DP_INFO(edev, "Location out-of-bounds\n");
return -EINVAL;
}

/* Check location isn't already in use */
- if (test_bit(fs->location, edev->arfs->arfs_fltr_bmap)) {
+ if (test_bit(location, edev->arfs->arfs_fltr_bmap)) {
DP_INFO(edev, "Location already in use\n");
return -EINVAL;
}
@@ -2170,46 +2038,56 @@ static int qede_flow_spec_validate(struct qede_dev *edev,
return -EINVAL;
}

- /* If drop requested then no need to validate other data */
- if (fs->ring_cookie == RX_CLS_FLOW_DISC)
- return 0;
-
- if (ethtool_get_flow_spec_ring_vf(fs->ring_cookie))
- return 0;
-
- if (fs->ring_cookie >= QEDE_RSS_COUNT(edev)) {
- DP_INFO(edev, "Queue out-of-bounds\n");
+ if (qede_parse_actions(edev, flow_action))
return -EINVAL;
- }

return 0;
}

-static int qede_flow_spec_to_tuple(struct qede_dev *edev,
- struct qede_arfs_tuple *t,
- struct ethtool_rx_flow_spec *fs)
+static int qede_flow_spec_to_rule(struct qede_dev *edev,
+ struct qede_arfs_tuple *t,
+ struct ethtool_rx_flow_spec *fs)
{
- memset(t, 0, sizeof(*t));
+ struct ethtool_rx_flow_spec_input input = {};
+ struct ethtool_rx_flow_rule *flow;
+ __be16 proto;
+ int err = 0;

if (qede_flow_spec_validate_unused(edev, fs))
return -EOPNOTSUPP;

switch ((fs->flow_type & ~FLOW_EXT)) {
case TCP_V4_FLOW:
- return qede_flow_spec_to_tuple_tcpv4(edev, t, fs);
case UDP_V4_FLOW:
- return qede_flow_spec_to_tuple_udpv4(edev, t, fs);
+ proto = htons(ETH_P_IP);
+ break;
case TCP_V6_FLOW:
- return qede_flow_spec_to_tuple_tcpv6(edev, t, fs);
case UDP_V6_FLOW:
- return qede_flow_spec_to_tuple_udpv6(edev, t, fs);
+ proto = htons(ETH_P_IPV6);
+ break;
default:
DP_VERBOSE(edev, NETIF_MSG_IFUP,
"Can't support flow of type %08x\n", fs->flow_type);
return -EOPNOTSUPP;
}

- return 0;
+ input.fs = fs;
+ flow = ethtool_rx_flow_rule_create(&input);
+ if (IS_ERR(flow))
+ return PTR_ERR(flow);
+
+ if (qede_parse_flow_attr(edev, proto, flow->rule, t)) {
+ err = -EINVAL;
+ goto err_out;
+ }
+
+ /* Make sure location is valid and filter isn't already set */
+ err = qede_flow_spec_validate(edev, &flow->rule->action, t,
+ fs->location);
+err_out:
+ ethtool_rx_flow_rule_destroy(flow);
+ return err;
+
}

int qede_add_cls_rule(struct qede_dev *edev, struct ethtool_rxnfc *info)
@@ -2227,12 +2105,7 @@ int qede_add_cls_rule(struct qede_dev *edev, struct ethtool_rxnfc *info)
}

/* Translate the flow specification into something fittign our DB */
- rc = qede_flow_spec_to_tuple(edev, &t, fsp);
- if (rc)
- goto unlock;
-
- /* Make sure location is valid and filter isn't already set */
- rc = qede_flow_spec_validate(edev, fsp, &t);
+ rc = qede_flow_spec_to_rule(edev, &t, fsp);
if (rc)
goto unlock;

--
2.11.0