From: David Marchand <david.marchand@redhat.com>
To: dev@dpdk.org
Cc: stephen@networkplumber.org, alialnu@nvidia.com, stable@dpdk.org
Subject: [PATCH] net/tap: fix build with LTO
Date: Mon, 22 Sep 2025 09:30:43 +0200 [thread overview]
Message-ID: <20250922073043.2394557-1-david.marchand@redhat.com> (raw)
The compiler has trouble understanding that the code is actually pointing
at the data in the message past the nh struct.
Update the tap_nlattr_add* helpers and the NLMSG_TAIL macro passing a
pointer to msg.
Bugzilla ID: 1511
Fixes: 7c25284e30c2 ("net/tap: add netlink back-end for flow API")
Cc: stable@dpdk.org
Signed-off-by: David Marchand <david.marchand@redhat.com>
---
drivers/net/tap/tap_flow.c | 117 +++++++++++++---------------------
drivers/net/tap/tap_netlink.c | 24 +++----
drivers/net/tap/tap_netlink.h | 10 +--
drivers/net/tap/tap_tcmsgs.c | 6 +-
4 files changed, 65 insertions(+), 92 deletions(-)
diff --git a/drivers/net/tap/tap_flow.c b/drivers/net/tap/tap_flow.c
index 373b773e2d..9d4ef27a8a 100644
--- a/drivers/net/tap/tap_flow.c
+++ b/drivers/net/tap/tap_flow.c
@@ -430,20 +430,16 @@ tap_flow_create_eth(const struct rte_flow_item *item, struct convert_data *info)
return 0;
msg = &flow->msg;
if (!rte_is_zero_ether_addr(&mask->hdr.dst_addr)) {
- tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_ETH_DST,
- RTE_ETHER_ADDR_LEN,
- &spec->hdr.dst_addr.addr_bytes);
- tap_nlattr_add(&msg->nh,
- TCA_FLOWER_KEY_ETH_DST_MASK, RTE_ETHER_ADDR_LEN,
- &mask->hdr.dst_addr.addr_bytes);
+ tap_nlattr_add(msg, TCA_FLOWER_KEY_ETH_DST, RTE_ETHER_ADDR_LEN,
+ &spec->hdr.dst_addr.addr_bytes);
+ tap_nlattr_add(msg, TCA_FLOWER_KEY_ETH_DST_MASK, RTE_ETHER_ADDR_LEN,
+ &mask->hdr.dst_addr.addr_bytes);
}
if (!rte_is_zero_ether_addr(&mask->hdr.src_addr)) {
- tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_ETH_SRC,
- RTE_ETHER_ADDR_LEN,
+ tap_nlattr_add(msg, TCA_FLOWER_KEY_ETH_SRC, RTE_ETHER_ADDR_LEN,
&spec->hdr.src_addr.addr_bytes);
- tap_nlattr_add(&msg->nh,
- TCA_FLOWER_KEY_ETH_SRC_MASK, RTE_ETHER_ADDR_LEN,
- &mask->hdr.src_addr.addr_bytes);
+ tap_nlattr_add(msg, TCA_FLOWER_KEY_ETH_SRC_MASK, RTE_ETHER_ADDR_LEN,
+ &mask->hdr.src_addr.addr_bytes);
}
return 0;
}
@@ -498,11 +494,9 @@ tap_flow_create_vlan(const struct rte_flow_item *item, struct convert_data *info
uint8_t vid = VLAN_ID(tci);
if (prio)
- tap_nlattr_add8(&msg->nh,
- TCA_FLOWER_KEY_VLAN_PRIO, prio);
+ tap_nlattr_add8(msg, TCA_FLOWER_KEY_VLAN_PRIO, prio);
if (vid)
- tap_nlattr_add16(&msg->nh,
- TCA_FLOWER_KEY_VLAN_ID, vid);
+ tap_nlattr_add16(msg, TCA_FLOWER_KEY_VLAN_ID, vid);
}
return 0;
}
@@ -544,20 +538,15 @@ tap_flow_create_ipv4(const struct rte_flow_item *item, struct convert_data *info
if (!spec)
return 0;
if (mask->hdr.dst_addr) {
- tap_nlattr_add32(&msg->nh, TCA_FLOWER_KEY_IPV4_DST,
- spec->hdr.dst_addr);
- tap_nlattr_add32(&msg->nh, TCA_FLOWER_KEY_IPV4_DST_MASK,
- mask->hdr.dst_addr);
+ tap_nlattr_add32(msg, TCA_FLOWER_KEY_IPV4_DST, spec->hdr.dst_addr);
+ tap_nlattr_add32(msg, TCA_FLOWER_KEY_IPV4_DST_MASK, mask->hdr.dst_addr);
}
if (mask->hdr.src_addr) {
- tap_nlattr_add32(&msg->nh, TCA_FLOWER_KEY_IPV4_SRC,
- spec->hdr.src_addr);
- tap_nlattr_add32(&msg->nh, TCA_FLOWER_KEY_IPV4_SRC_MASK,
- mask->hdr.src_addr);
+ tap_nlattr_add32(msg, TCA_FLOWER_KEY_IPV4_SRC, spec->hdr.src_addr);
+ tap_nlattr_add32(msg, TCA_FLOWER_KEY_IPV4_SRC_MASK, mask->hdr.src_addr);
}
if (spec->hdr.next_proto_id)
- tap_nlattr_add8(&msg->nh, TCA_FLOWER_KEY_IP_PROTO,
- spec->hdr.next_proto_id);
+ tap_nlattr_add8(msg, TCA_FLOWER_KEY_IP_PROTO, spec->hdr.next_proto_id);
return 0;
}
@@ -599,20 +588,19 @@ tap_flow_create_ipv6(const struct rte_flow_item *item, struct convert_data *info
if (!spec)
return 0;
if (memcmp(&mask->hdr.dst_addr, empty_addr, 16)) {
- tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_IPV6_DST,
- sizeof(spec->hdr.dst_addr), &spec->hdr.dst_addr);
- tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_IPV6_DST_MASK,
- sizeof(mask->hdr.dst_addr), &mask->hdr.dst_addr);
+ tap_nlattr_add(msg, TCA_FLOWER_KEY_IPV6_DST, sizeof(spec->hdr.dst_addr),
+ &spec->hdr.dst_addr);
+ tap_nlattr_add(msg, TCA_FLOWER_KEY_IPV6_DST_MASK, sizeof(mask->hdr.dst_addr),
+ &mask->hdr.dst_addr);
}
if (memcmp(&mask->hdr.src_addr, empty_addr, 16)) {
- tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_IPV6_SRC,
- sizeof(spec->hdr.src_addr), &spec->hdr.src_addr);
- tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_IPV6_SRC_MASK,
- sizeof(mask->hdr.src_addr), &mask->hdr.src_addr);
+ tap_nlattr_add(msg, TCA_FLOWER_KEY_IPV6_SRC, sizeof(spec->hdr.src_addr),
+ &spec->hdr.src_addr);
+ tap_nlattr_add(msg, TCA_FLOWER_KEY_IPV6_SRC_MASK, sizeof(mask->hdr.src_addr),
+ &mask->hdr.src_addr);
}
if (spec->hdr.proto)
- tap_nlattr_add8(&msg->nh,
- TCA_FLOWER_KEY_IP_PROTO, spec->hdr.proto);
+ tap_nlattr_add8(msg, TCA_FLOWER_KEY_IP_PROTO, spec->hdr.proto);
return 0;
}
@@ -649,15 +637,13 @@ tap_flow_create_udp(const struct rte_flow_item *item, struct convert_data *info)
if (!flow)
return 0;
msg = &flow->msg;
- tap_nlattr_add8(&msg->nh, TCA_FLOWER_KEY_IP_PROTO, IPPROTO_UDP);
+ tap_nlattr_add8(msg, TCA_FLOWER_KEY_IP_PROTO, IPPROTO_UDP);
if (!spec)
return 0;
if (mask->hdr.dst_port)
- tap_nlattr_add16(&msg->nh, TCA_FLOWER_KEY_UDP_DST,
- spec->hdr.dst_port);
+ tap_nlattr_add16(msg, TCA_FLOWER_KEY_UDP_DST, spec->hdr.dst_port);
if (mask->hdr.src_port)
- tap_nlattr_add16(&msg->nh, TCA_FLOWER_KEY_UDP_SRC,
- spec->hdr.src_port);
+ tap_nlattr_add16(msg, TCA_FLOWER_KEY_UDP_SRC, spec->hdr.src_port);
return 0;
}
@@ -694,15 +680,13 @@ tap_flow_create_tcp(const struct rte_flow_item *item, struct convert_data *info)
if (!flow)
return 0;
msg = &flow->msg;
- tap_nlattr_add8(&msg->nh, TCA_FLOWER_KEY_IP_PROTO, IPPROTO_TCP);
+ tap_nlattr_add8(msg, TCA_FLOWER_KEY_IP_PROTO, IPPROTO_TCP);
if (!spec)
return 0;
if (mask->hdr.dst_port)
- tap_nlattr_add16(&msg->nh, TCA_FLOWER_KEY_TCP_DST,
- spec->hdr.dst_port);
+ tap_nlattr_add16(msg, TCA_FLOWER_KEY_TCP_DST, spec->hdr.dst_port);
if (mask->hdr.src_port)
- tap_nlattr_add16(&msg->nh, TCA_FLOWER_KEY_TCP_SRC,
- spec->hdr.src_port);
+ tap_nlattr_add16(msg, TCA_FLOWER_KEY_TCP_SRC, spec->hdr.src_port);
return 0;
}
@@ -810,37 +794,30 @@ add_action(struct rte_flow *flow, size_t *act_index, struct action_data *adata)
if (tap_nlattr_nested_start(msg, (*act_index)++) < 0)
return -1;
- tap_nlattr_add(&msg->nh, TCA_ACT_KIND,
- strlen(adata->id) + 1, adata->id);
+ tap_nlattr_add(msg, TCA_ACT_KIND, strlen(adata->id) + 1, adata->id);
if (tap_nlattr_nested_start(msg, TCA_ACT_OPTIONS) < 0)
return -1;
if (strcmp("gact", adata->id) == 0) {
- tap_nlattr_add(&msg->nh, TCA_GACT_PARMS, sizeof(adata->gact),
- &adata->gact);
+ tap_nlattr_add(msg, TCA_GACT_PARMS, sizeof(adata->gact), &adata->gact);
} else if (strcmp("mirred", adata->id) == 0) {
if (adata->mirred.eaction == TCA_EGRESS_MIRROR)
adata->mirred.action = TC_ACT_PIPE;
else /* REDIRECT */
adata->mirred.action = TC_ACT_STOLEN;
- tap_nlattr_add(&msg->nh, TCA_MIRRED_PARMS,
- sizeof(adata->mirred),
- &adata->mirred);
+ tap_nlattr_add(msg, TCA_MIRRED_PARMS, sizeof(adata->mirred), &adata->mirred);
} else if (strcmp("skbedit", adata->id) == 0) {
- tap_nlattr_add(&msg->nh, TCA_SKBEDIT_PARMS,
- sizeof(adata->skbedit.skbedit), &adata->skbedit.skbedit);
+ tap_nlattr_add(msg, TCA_SKBEDIT_PARMS, sizeof(adata->skbedit.skbedit),
+ &adata->skbedit.skbedit);
if (adata->skbedit.mark)
- tap_nlattr_add32(&msg->nh, TCA_SKBEDIT_MARK, adata->skbedit.mark);
+ tap_nlattr_add32(msg, TCA_SKBEDIT_MARK, adata->skbedit.mark);
else
- tap_nlattr_add16(&msg->nh, TCA_SKBEDIT_QUEUE_MAPPING, adata->skbedit.queue);
+ tap_nlattr_add16(msg, TCA_SKBEDIT_QUEUE_MAPPING, adata->skbedit.queue);
} else if (strcmp("bpf", adata->id) == 0) {
#ifdef HAVE_BPF_RSS
- tap_nlattr_add32(&msg->nh, TCA_ACT_BPF_FD, adata->bpf.bpf_fd);
- tap_nlattr_add(&msg->nh, TCA_ACT_BPF_NAME,
- strlen(adata->bpf.annotation) + 1,
- adata->bpf.annotation);
- tap_nlattr_add(&msg->nh, TCA_ACT_BPF_PARMS,
- sizeof(adata->bpf.bpf),
- &adata->bpf.bpf);
+ tap_nlattr_add32(msg, TCA_ACT_BPF_FD, adata->bpf.bpf_fd);
+ tap_nlattr_add(msg, TCA_ACT_BPF_NAME, strlen(adata->bpf.annotation) + 1,
+ adata->bpf.annotation);
+ tap_nlattr_add(msg, TCA_ACT_BPF_PARMS, sizeof(adata->bpf.bpf), &adata->bpf.bpf);
#else
TAP_LOG(ERR, "Internal error: bpf requested but not supported");
return -1;
@@ -975,7 +952,7 @@ priv_flow_process(struct pmd_internals *pmd,
TC_H_MAKE(MULTIQ_MAJOR_HANDLE, 0);
}
/* use flower filter type */
- tap_nlattr_add(&flow->msg.nh, TCA_KIND, sizeof("flower"), "flower");
+ tap_nlattr_add(&flow->msg, TCA_KIND, sizeof("flower"), "flower");
if (tap_nlattr_nested_start(&flow->msg, TCA_OPTIONS) < 0) {
rte_flow_error_set(error, ENOMEM, RTE_FLOW_ERROR_TYPE_ACTION,
actions, "could not allocated netlink msg");
@@ -1015,15 +992,11 @@ priv_flow_process(struct pmd_internals *pmd,
}
if (flow) {
if (data.vlan) {
- tap_nlattr_add16(&flow->msg.nh, TCA_FLOWER_KEY_ETH_TYPE,
- htons(ETH_P_8021Q));
- tap_nlattr_add16(&flow->msg.nh,
- TCA_FLOWER_KEY_VLAN_ETH_TYPE,
- data.eth_type ?
- data.eth_type : htons(ETH_P_ALL));
+ tap_nlattr_add16(&flow->msg, TCA_FLOWER_KEY_ETH_TYPE, htons(ETH_P_8021Q));
+ tap_nlattr_add16(&flow->msg, TCA_FLOWER_KEY_VLAN_ETH_TYPE,
+ data.eth_type ? data.eth_type : htons(ETH_P_ALL));
} else if (data.eth_type) {
- tap_nlattr_add16(&flow->msg.nh, TCA_FLOWER_KEY_ETH_TYPE,
- data.eth_type);
+ tap_nlattr_add16(&flow->msg, TCA_FLOWER_KEY_ETH_TYPE, data.eth_type);
}
}
if (mirred && flow) {
diff --git a/drivers/net/tap/tap_netlink.c b/drivers/net/tap/tap_netlink.c
index 8a57c9242c..5ff60f41d4 100644
--- a/drivers/net/tap/tap_netlink.c
+++ b/drivers/net/tap/tap_netlink.c
@@ -293,18 +293,18 @@ tap_nl_recv(int nlsk_fd, int (*cb)(struct nlmsghdr *, void *arg), void *arg)
* The data to append.
*/
void
-tap_nlattr_add(struct nlmsghdr *nh, unsigned short type,
+tap_nlattr_add(struct tap_nlmsg *msg, unsigned short type,
unsigned int data_len, const void *data)
{
/* see man 3 rtnetlink */
struct rtattr *rta;
- rta = (struct rtattr *)NLMSG_TAIL(nh);
+ rta = (struct rtattr *)NLMSG_TAIL(msg);
rta->rta_len = RTA_LENGTH(data_len);
rta->rta_type = type;
if (data_len > 0)
memcpy(RTA_DATA(rta), data, data_len);
- nh->nlmsg_len = NLMSG_ALIGN(nh->nlmsg_len) + RTA_ALIGN(rta->rta_len);
+ msg->nh.nlmsg_len = NLMSG_ALIGN(msg->nh.nlmsg_len) + RTA_ALIGN(rta->rta_len);
}
/**
@@ -318,9 +318,9 @@ tap_nlattr_add(struct nlmsghdr *nh, unsigned short type,
* The data to append.
*/
void
-tap_nlattr_add8(struct nlmsghdr *nh, unsigned short type, uint8_t data)
+tap_nlattr_add8(struct tap_nlmsg *msg, unsigned short type, uint8_t data)
{
- tap_nlattr_add(nh, type, sizeof(uint8_t), &data);
+ tap_nlattr_add(msg, type, sizeof(uint8_t), &data);
}
/**
@@ -334,9 +334,9 @@ tap_nlattr_add8(struct nlmsghdr *nh, unsigned short type, uint8_t data)
* The data to append.
*/
void
-tap_nlattr_add16(struct nlmsghdr *nh, unsigned short type, uint16_t data)
+tap_nlattr_add16(struct tap_nlmsg *msg, unsigned short type, uint16_t data)
{
- tap_nlattr_add(nh, type, sizeof(uint16_t), &data);
+ tap_nlattr_add(msg, type, sizeof(uint16_t), &data);
}
/**
@@ -350,9 +350,9 @@ tap_nlattr_add16(struct nlmsghdr *nh, unsigned short type, uint16_t data)
* The data to append.
*/
void
-tap_nlattr_add32(struct nlmsghdr *nh, unsigned short type, uint32_t data)
+tap_nlattr_add32(struct tap_nlmsg *msg, unsigned short type, uint32_t data)
{
- tap_nlattr_add(nh, type, sizeof(uint32_t), &data);
+ tap_nlattr_add(msg, type, sizeof(uint32_t), &data);
}
/**
@@ -379,9 +379,9 @@ tap_nlattr_nested_start(struct tap_nlmsg *msg, uint16_t type)
return -1;
}
- tail->tail = (struct rtattr *)NLMSG_TAIL(&msg->nh);
+ tail->tail = (struct rtattr *)NLMSG_TAIL(msg);
- tap_nlattr_add(&msg->nh, type, 0, NULL);
+ tap_nlattr_add(msg, type, 0, NULL);
tail->prev = msg->nested_tails;
@@ -404,7 +404,7 @@ tap_nlattr_nested_finish(struct tap_nlmsg *msg)
{
struct nested_tail *tail = msg->nested_tails;
- tail->tail->rta_len = (char *)NLMSG_TAIL(&msg->nh) - (char *)tail->tail;
+ tail->tail->rta_len = (char *)NLMSG_TAIL(msg) - (char *)tail->tail;
if (tail->prev)
msg->nested_tails = tail->prev;
diff --git a/drivers/net/tap/tap_netlink.h b/drivers/net/tap/tap_netlink.h
index 466c47a6d7..5eff6edbb1 100644
--- a/drivers/net/tap/tap_netlink.h
+++ b/drivers/net/tap/tap_netlink.h
@@ -23,7 +23,7 @@ struct tap_nlmsg {
struct nested_tail *nested_tails;
};
-#define NLMSG_TAIL(nlh) (void *)((char *)(nlh) + NLMSG_ALIGN((nlh)->nlmsg_len))
+#define NLMSG_TAIL(msg) (void *)((char *)(msg) + NLMSG_ALIGN((msg)->nh.nlmsg_len))
int tap_nl_init(uint32_t nl_groups);
int tap_nl_final(int nlsk_fd);
@@ -31,11 +31,11 @@ int tap_nl_send(int nlsk_fd, struct nlmsghdr *nh);
int tap_nl_recv(int nlsk_fd, int (*callback)(struct nlmsghdr *, void *),
void *arg);
int tap_nl_recv_ack(int nlsk_fd);
-void tap_nlattr_add(struct nlmsghdr *nh, unsigned short type,
+void tap_nlattr_add(struct tap_nlmsg *msg, unsigned short type,
unsigned int data_len, const void *data);
-void tap_nlattr_add8(struct nlmsghdr *nh, unsigned short type, uint8_t data);
-void tap_nlattr_add16(struct nlmsghdr *nh, unsigned short type, uint16_t data);
-void tap_nlattr_add32(struct nlmsghdr *nh, unsigned short type, uint32_t data);
+void tap_nlattr_add8(struct tap_nlmsg *msg, unsigned short type, uint8_t data);
+void tap_nlattr_add16(struct tap_nlmsg *msg, unsigned short type, uint16_t data);
+void tap_nlattr_add32(struct tap_nlmsg *msg, unsigned short type, uint32_t data);
int tap_nlattr_nested_start(struct tap_nlmsg *msg, uint16_t type);
void tap_nlattr_nested_finish(struct tap_nlmsg *msg);
diff --git a/drivers/net/tap/tap_tcmsgs.c b/drivers/net/tap/tap_tcmsgs.c
index caca9445c8..c32f0ff815 100644
--- a/drivers/net/tap/tap_tcmsgs.c
+++ b/drivers/net/tap/tap_tcmsgs.c
@@ -123,8 +123,8 @@ qdisc_add_multiq(int nlsk_fd, unsigned int ifindex)
NLM_F_REQUEST | NLM_F_ACK | NLM_F_EXCL | NLM_F_CREATE);
msg.t.tcm_handle = TC_H_MAKE(MULTIQ_MAJOR_HANDLE, 0);
msg.t.tcm_parent = TC_H_ROOT;
- tap_nlattr_add(&msg.nh, TCA_KIND, sizeof("multiq"), "multiq");
- tap_nlattr_add(&msg.nh, TCA_OPTIONS, sizeof(opt), &opt);
+ tap_nlattr_add(&msg, TCA_KIND, sizeof("multiq"), "multiq");
+ tap_nlattr_add(&msg, TCA_OPTIONS, sizeof(opt), &opt);
if (tap_nl_send(nlsk_fd, &msg.nh) < 0)
return -1;
if (tap_nl_recv_ack(nlsk_fd) < 0)
@@ -152,7 +152,7 @@ qdisc_add_ingress(int nlsk_fd, unsigned int ifindex)
NLM_F_REQUEST | NLM_F_ACK | NLM_F_EXCL | NLM_F_CREATE);
msg.t.tcm_handle = TC_H_MAKE(TC_H_INGRESS, 0);
msg.t.tcm_parent = TC_H_INGRESS;
- tap_nlattr_add(&msg.nh, TCA_KIND, sizeof("ingress"), "ingress");
+ tap_nlattr_add(&msg, TCA_KIND, sizeof("ingress"), "ingress");
if (tap_nl_send(nlsk_fd, &msg.nh) < 0)
return -1;
if (tap_nl_recv_ack(nlsk_fd) < 0)
--
2.51.0
next reply other threads:[~2025-09-22 7:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-22 7:30 David Marchand [this message]
2025-09-22 22:12 ` Stephen Hemminger
2025-09-23 3:57 ` Stephen Hemminger
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