From: Laurent Vivier <lvivier@redhat.com>
To: passt-dev@passt.top
Cc: Laurent Vivier <lvivier@redhat.com>
Subject: [PATCH v6 04/12] tap: Thread queue pair through all remaining tap paths
Date: Fri, 31 Jul 2026 18:16:09 +0200 [thread overview]
Message-ID: <20260731161617.3550626-5-lvivier@redhat.com> (raw)
In-Reply-To: <20260731161617.3550626-1-lvivier@redhat.com>
The previous commit threaded queue pair through vu_send_single().
Extend this to every other tap entry point: tap_send_single(), receive
handlers (tap_add_packet, tap_handler, tap4/6_handler), and send
helpers (tap_udp4/6_send, tap_icmp4/6_send).
All callers pass QPAIR_DEFAULT except vu_handle_tx(), which derives
the queue pair from the virtqueue index with QPAIR_FROM_QUEUE().
The parameter is plumbed but not yet consumed. Subsequent patches will
use it to direct traffic to the correct queue pair.
No functional change.
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
---
arp.c | 6 ++---
dhcp.c | 3 ++-
dhcpv6.c | 6 +++--
icmp.c | 6 +++--
ndp.c | 2 +-
tap.c | 65 +++++++++++++++++++++++++++++++++--------------------
tap.h | 19 ++++++++--------
tcp.c | 2 +-
udp.c | 4 ++--
vu_common.c | 7 +++---
10 files changed, 72 insertions(+), 48 deletions(-)
diff --git a/arp.c b/arp.c
index bb042e9585a3..e97c4de86a99 100644
--- a/arp.c
+++ b/arp.c
@@ -112,7 +112,7 @@ int arp(const struct ctx *c, struct iov_tail *data)
memcpy(resp.am.tha, am->sha, sizeof(resp.am.tha));
memcpy(resp.am.tip, am->sip, sizeof(resp.am.tip));
- tap_send_single(c, &resp, sizeof(resp));
+ tap_send_single(c, QPAIR_DEFAULT, &resp, sizeof(resp));
return 1;
}
@@ -148,7 +148,7 @@ void arp_send_init_req(const struct ctx *c)
memcpy(req.am.tip, &c->ip4.addr, sizeof(req.am.tip));
debug("Sending initial ARP request for guest MAC address");
- tap_send_single(c, &req, sizeof(req));
+ tap_send_single(c, QPAIR_DEFAULT, &req, sizeof(req));
}
/**
@@ -202,5 +202,5 @@ void arp_announce(const struct ctx *c, struct in_addr *ip,
eth_ntop(mac, mac_str, sizeof(mac_str));
debug("ARP announcement for %s / %s", ip_str, mac_str);
- tap_send_single(c, &msg, sizeof(msg));
+ tap_send_single(c, QPAIR_DEFAULT, &msg, sizeof(msg));
}
diff --git a/dhcp.c b/dhcp.c
index c3c742245ccf..1bd68ed5b87b 100644
--- a/dhcp.c
+++ b/dhcp.c
@@ -477,7 +477,8 @@ int dhcp(const struct ctx *c, struct iov_tail *data)
else
dst = c->ip4.addr;
- tap_udp4_send(c, c->ip4.our_tap_addr, 67, dst, 68, &reply, dlen);
+ tap_udp4_send(c, QPAIR_DEFAULT, c->ip4.our_tap_addr, 67, dst, 68,
+ &reply, dlen);
return 1;
}
diff --git a/dhcpv6.c b/dhcpv6.c
index 29c7e320be8f..0986d6149515 100644
--- a/dhcpv6.c
+++ b/dhcpv6.c
@@ -407,7 +407,8 @@ static void dhcpv6_send_ia_notonlink(struct ctx *c,
resp_not_on_link.hdr.xid = xid;
- tap_udp6_send(c, src, 547, caddr, 546, xid, &resp_not_on_link, n);
+ tap_udp6_send(c, QPAIR_DEFAULT, src, 547, caddr, 546, xid,
+ &resp_not_on_link, n);
}
/**
@@ -681,7 +682,8 @@ int dhcpv6(struct ctx *c, struct iov_tail *data,
resp.hdr.xid = mh->xid;
- tap_udp6_send(c, src, 547, saddr, 546, mh->xid, &resp, n);
+ tap_udp6_send(c, QPAIR_DEFAULT, src, 547, saddr, 546, mh->xid, &resp,
+ n);
c->ip6.addr_seen = c->ip6.addr;
return 1;
diff --git a/icmp.c b/icmp.c
index 0fe23667f517..a1015fe9f5c2 100644
--- a/icmp.c
+++ b/icmp.c
@@ -134,12 +134,14 @@ void icmp_sock_handler(const struct ctx *c, union epoll_ref ref,
const struct in_addr *daddr = inany_v4(&ini->eaddr);
assert(saddr && daddr); /* Must have IPv4 addresses */
- tap_icmp4_send(c, *saddr, *daddr, buf, pingf->f.tap_omac, n);
+ tap_icmp4_send(c, QPAIR_DEFAULT, *saddr, *daddr, buf,
+ pingf->f.tap_omac, n);
} else if (pingf->f.type == FLOW_PING6) {
const struct in6_addr *saddr = &ini->oaddr.a6;
const struct in6_addr *daddr = &ini->eaddr.a6;
- tap_icmp6_send(c, saddr, daddr, buf, pingf->f.tap_omac, n);
+ tap_icmp6_send(c, QPAIR_DEFAULT, saddr, daddr, buf,
+ pingf->f.tap_omac, n);
}
return;
diff --git a/ndp.c b/ndp.c
index 1f2bcb0cc7ea..6269cb38d93f 100644
--- a/ndp.c
+++ b/ndp.c
@@ -184,7 +184,7 @@ static void ndp_send(const struct ctx *c, const struct in6_addr *dst,
{
const struct in6_addr *src = &c->ip6.our_tap_ll;
- tap_icmp6_send(c, src, dst, buf, c->our_tap_mac, l4len);
+ tap_icmp6_send(c, QPAIR_DEFAULT, src, dst, buf, c->our_tap_mac, l4len);
}
/**
diff --git a/tap.c b/tap.c
index 4956e4dc2589..206a1c36b779 100644
--- a/tap.c
+++ b/tap.c
@@ -124,10 +124,12 @@ unsigned long tap_l2_max_len(const struct ctx *c)
/**
* tap_send_single() - Send a single frame
* @c: Execution context
+ * @qpair: Queue pair on which to send the frame
* @data: Packet buffer
* @l2len: Total L2 packet length
*/
-void tap_send_single(const struct ctx *c, const void *data, size_t l2len)
+void tap_send_single(const struct ctx *c, unsigned int qpair, const void *data,
+ size_t l2len)
{
uint8_t padded[ETH_ZLEN] = { 0 };
struct iovec iov[2];
@@ -155,7 +157,7 @@ void tap_send_single(const struct ctx *c, const void *data, size_t l2len)
tap_send_frames(c, iov, iovcnt, 1);
break;
case MODE_VU:
- vu_send_single(c, QPAIR_DEFAULT, data, l2len);
+ vu_send_single(c, qpair, data, l2len);
break;
}
}
@@ -243,6 +245,7 @@ void *tap_push_uh4(struct udphdr *uh, struct in_addr src, in_port_t sport,
/**
* tap_udp4_send() - Send UDP over IPv4 packet
* @c: Execution context
+ * @qpair: Queue pair on which to send packet
* @src: IPv4 source address
* @sport: UDP source port
* @dst: IPv4 destination address
@@ -250,8 +253,8 @@ void *tap_push_uh4(struct udphdr *uh, struct in_addr src, in_port_t sport,
* @in: UDP payload contents (not including UDP header)
* @dlen: UDP payload length (not including UDP header)
*/
-void tap_udp4_send(const struct ctx *c, struct in_addr src, in_port_t sport,
- struct in_addr dst, in_port_t dport,
+void tap_udp4_send(const struct ctx *c, unsigned int qpair, struct in_addr src,
+ in_port_t sport, struct in_addr dst, in_port_t dport,
const void *in, size_t dlen)
{
size_t l4len = dlen + sizeof(struct udphdr);
@@ -261,20 +264,22 @@ void tap_udp4_send(const struct ctx *c, struct in_addr src, in_port_t sport,
char *data = tap_push_uh4(uh, src, sport, dst, dport, in, dlen);
memcpy(data, in, dlen);
- tap_send_single(c, buf, dlen + (data - buf));
+ tap_send_single(c, qpair, buf, dlen + (data - buf));
}
/**
* tap_icmp4_send() - Send ICMPv4 packet
* @c: Execution context
+ * @qpair: Queue pair on which to send packet
* @src: IPv4 source address
* @dst: IPv4 destination address
* @in: ICMP packet, including ICMP header
* @src_mac: MAC address to be used as source for message
* @l4len: ICMP packet length, including ICMP header
*/
-void tap_icmp4_send(const struct ctx *c, struct in_addr src, struct in_addr dst,
- const void *in, const void *src_mac, size_t l4len)
+void tap_icmp4_send(const struct ctx *c, unsigned int qpair, struct in_addr src,
+ struct in_addr dst, const void *in, const void *src_mac,
+ size_t l4len)
{
char buf[USHRT_MAX];
struct iphdr *ip4h = tap_push_l2h(c, buf, src_mac, ETH_P_IP);
@@ -284,7 +289,7 @@ void tap_icmp4_send(const struct ctx *c, struct in_addr src, struct in_addr dst,
memcpy(icmp4h, in, l4len);
csum_icmp4(icmp4h, icmp4h + 1, l4len - sizeof(*icmp4h));
- tap_send_single(c, buf, l4len + ((char *)icmp4h - buf));
+ tap_send_single(c, qpair, buf, l4len + ((char *)icmp4h - buf));
}
/**
@@ -348,6 +353,7 @@ void *tap_push_uh6(struct udphdr *uh,
/**
* tap_udp6_send() - Send UDP over IPv6 packet
* @c: Execution context
+ * @qpair: Queue pair on which to send packet
* @src: IPv6 source address
* @sport: UDP source port
* @dst: IPv6 destination address
@@ -356,7 +362,7 @@ void *tap_push_uh6(struct udphdr *uh,
* @in: UDP payload contents (not including UDP header)
* @dlen: UDP payload length (not including UDP header)
*/
-void tap_udp6_send(const struct ctx *c,
+void tap_udp6_send(const struct ctx *c, unsigned int qpair,
const struct in6_addr *src, in_port_t sport,
const struct in6_addr *dst, in_port_t dport,
uint32_t flow, void *in, size_t dlen)
@@ -369,19 +375,20 @@ void tap_udp6_send(const struct ctx *c,
char *data = tap_push_uh6(uh, src, sport, dst, dport, in, dlen);
memcpy(data, in, dlen);
- tap_send_single(c, buf, dlen + (data - buf));
+ tap_send_single(c, qpair, buf, dlen + (data - buf));
}
/**
* tap_icmp6_send() - Send ICMPv6 packet
* @c: Execution context
+ * @qpair: Queue pair on which to send packet
* @src: IPv6 source address
* @dst: IPv6 destination address
* @in: ICMP packet, including ICMP header
* @src_mac: MAC address to be used as source for message
* @l4len: ICMP packet length, including ICMP header
*/
-void tap_icmp6_send(const struct ctx *c,
+void tap_icmp6_send(const struct ctx *c, unsigned int qpair,
const struct in6_addr *src, const struct in6_addr *dst,
const void *in, const void *src_mac, size_t l4len)
{
@@ -393,7 +400,7 @@ void tap_icmp6_send(const struct ctx *c,
memcpy(icmp6h, in, l4len);
csum_icmp6(icmp6h, src, dst, icmp6h + 1, l4len - sizeof(*icmp6h));
- tap_send_single(c, buf, l4len + ((char *)icmp6h - buf));
+ tap_send_single(c, qpair, buf, l4len + ((char *)icmp6h - buf));
}
/**
@@ -684,15 +691,19 @@ static bool tap4_is_fragment(const struct iphdr *iph,
/**
* tap4_handler() - IPv4 and ARP packet handler for tap file descriptor
* @c: Execution context
+ * @qpair: Queue pair on which to send packets
* @now: Current timestamp
*
* Return: count of packets consumed by handlers
*/
-static int tap4_handler(struct ctx *c, const struct timespec *now)
+static int tap4_handler(struct ctx *c, unsigned int qpair,
+ const struct timespec *now)
{
unsigned int i, j, seq_count;
struct tap4_l4_t *seq;
+ (void)qpair;
+
if (!c->ifi4 || !pool_tap4->count)
return pool_tap4->count;
@@ -930,15 +941,19 @@ found:
/**
* tap6_handler() - IPv6 packet handler for tap file descriptor
* @c: Execution context
+ * @qpair: Queue pair on which to send packets
* @now: Current timestamp
*
* Return: count of packets consumed by handlers
*/
-static int tap6_handler(struct ctx *c, const struct timespec *now)
+static int tap6_handler(struct ctx *c, unsigned int qpair,
+ const struct timespec *now)
{
unsigned int i, j, seq_count = 0;
struct tap6_l4_t *seq;
+ (void)qpair;
+
if (!c->ifi6 || !pool_tap6->count)
return pool_tap6->count;
@@ -1136,21 +1151,23 @@ void tap_flush_pools(void)
/**
* tap_handler() - IPv4/IPv6 and ARP packet handler for tap file descriptor
* @c: Execution context
+ * @qpair: Queue pair on which to send packets
* @now: Current timestamp
*/
-void tap_handler(struct ctx *c, const struct timespec *now)
+void tap_handler(struct ctx *c, unsigned int qpair, const struct timespec *now)
{
- tap4_handler(c, now);
- tap6_handler(c, now);
+ tap4_handler(c, qpair, now);
+ tap6_handler(c, qpair, now);
}
/**
* tap_add_packet() - Queue/capture packet, update notion of guest MAC address
* @c: Execution context
+ * @qpair: Queue pair associated with the packet
* @data: Packet to add to the pool
* @now: Current timestamp
*/
-void tap_add_packet(struct ctx *c, struct iov_tail *data,
+void tap_add_packet(struct ctx *c, unsigned int qpair, struct iov_tail *data,
const struct timespec *now)
{
size_t l2len = iov_tail_size(data);
@@ -1177,14 +1194,14 @@ void tap_add_packet(struct ctx *c, struct iov_tail *data,
case ETH_P_ARP:
case ETH_P_IP:
if (!pool_can_fit(pool_tap4, data)) {
- tap4_handler(c, now);
+ tap4_handler(c, qpair, now);
pool_flush(pool_tap4);
}
packet_add(pool_tap4, data);
break;
case ETH_P_IPV6:
if (!pool_can_fit(pool_tap6, data)) {
- tap6_handler(c, now);
+ tap6_handler(c, qpair, now);
pool_flush(pool_tap6);
}
packet_add(pool_tap6, data);
@@ -1269,7 +1286,7 @@ static void tap_passt_input(struct ctx *c, const struct timespec *now)
n -= sizeof(uint32_t);
data = IOV_TAIL_FROM_BUF(p, l2len, 0);
- tap_add_packet(c, &data, now);
+ tap_add_packet(c, QPAIR_DEFAULT, &data, now);
p += l2len;
n -= l2len;
@@ -1278,7 +1295,7 @@ static void tap_passt_input(struct ctx *c, const struct timespec *now)
partial_len = n;
partial_frame = p;
- tap_handler(c, now);
+ tap_handler(c, QPAIR_DEFAULT, now);
}
/**
@@ -1337,10 +1354,10 @@ static void tap_pasta_input(struct ctx *c, const struct timespec *now)
continue;
data = IOV_TAIL_FROM_BUF(pkt_buf + n, len, 0);
- tap_add_packet(c, &data, now);
+ tap_add_packet(c, QPAIR_DEFAULT, &data, now);
}
- tap_handler(c, now);
+ tap_handler(c, QPAIR_DEFAULT, now);
}
/**
diff --git a/tap.h b/tap.h
index b335933fdbc9..0f8e98fc5f84 100644
--- a/tap.h
+++ b/tap.h
@@ -91,22 +91,23 @@ void *tap_push_ip6h(struct ipv6hdr *ip6h,
const struct in6_addr *src,
const struct in6_addr *dst,
size_t l4len, uint8_t proto, uint32_t flow);
-void tap_udp4_send(const struct ctx *c, struct in_addr src, in_port_t sport,
- struct in_addr dst, in_port_t dport,
+void tap_udp4_send(const struct ctx *c, unsigned int qpair, struct in_addr src,
+ in_port_t sport, struct in_addr dst, in_port_t dport,
const void *in, size_t dlen);
-void tap_icmp4_send(const struct ctx *c, struct in_addr src, struct in_addr dst,
- const void *in, const void *src_mac, size_t l4len);
+void tap_icmp4_send(const struct ctx *c, unsigned int qpair, struct in_addr src,
+ struct in_addr dst, const void *in, const void *src_mac,
+ size_t l4len);
void *tap_push_ip6h(struct ipv6hdr *ip6h,
const struct in6_addr *src, const struct in6_addr *dst,
size_t l4len, uint8_t proto, uint32_t flow);
-void tap_udp6_send(const struct ctx *c,
+void tap_udp6_send(const struct ctx *c, unsigned int qpair,
const struct in6_addr *src, in_port_t sport,
const struct in6_addr *dst, in_port_t dport,
uint32_t flow, void *in, size_t dlen);
-void tap_icmp6_send(const struct ctx *c,
+void tap_icmp6_send(const struct ctx *c, unsigned int qpair,
const struct in6_addr *src, const struct in6_addr *dst,
const void *in, const void *src_mac, size_t l4len);
-void tap_send_single(const struct ctx *c, const void *data, size_t l2len);
+void tap_send_single(const struct ctx *c, unsigned int qpair, const void *data, size_t l2len);
size_t tap_send_frames(const struct ctx *c, const struct iovec *iov,
size_t bufs_per_frame, size_t nframes);
void eth_update_mac(struct ethhdr *eh,
@@ -121,7 +122,7 @@ int tap_sock_unix_open(char *sock_path);
void tap_sock_reset(struct ctx *c);
void tap_backend_init(struct ctx *c);
void tap_flush_pools(void);
-void tap_handler(struct ctx *c, const struct timespec *now);
-void tap_add_packet(struct ctx *c, struct iov_tail *data,
+void tap_handler(struct ctx *c, unsigned int qpair, const struct timespec *now);
+void tap_add_packet(struct ctx *c, unsigned int qpair, struct iov_tail *data,
const struct timespec *now);
#endif /* TAP_H */
diff --git a/tcp.c b/tcp.c
index 3b78d2edd03e..6b7612c27abf 100644
--- a/tcp.c
+++ b/tcp.c
@@ -2285,7 +2285,7 @@ static void tcp_rst_no_conn(const struct ctx *c, int af,
tcp_update_csum(psum, rsth, &payload, 0);
rst_l2len = ((char *)rsth - buf) + sizeof(*rsth);
- tap_send_single(c, buf, rst_l2len);
+ tap_send_single(c, QPAIR_DEFAULT, buf, rst_l2len);
}
/**
diff --git a/udp.c b/udp.c
index 505e55407fb4..589d48a17613 100644
--- a/udp.c
+++ b/udp.c
@@ -445,7 +445,7 @@ static void udp_send_tap_icmp4(const struct ctx *c,
/* Try to obtain the MAC address of the generating node */
saddr_any = inany_from_v4(saddr);
fwd_neigh_mac_get(c, &saddr_any, tap_omac);
- tap_icmp4_send(c, saddr, eaddr, &msg, tap_omac, msglen);
+ tap_icmp4_send(c, QPAIR_DEFAULT, saddr, eaddr, &msg, tap_omac, msglen);
}
@@ -493,7 +493,7 @@ static void udp_send_tap_icmp6(const struct ctx *c,
/* Try to obtain the MAC address of the generating node */
fwd_neigh_mac_get(c, (union inany_addr *) saddr, tap_omac);
- tap_icmp6_send(c, saddr, eaddr, &msg, tap_omac, msglen);
+ tap_icmp6_send(c, QPAIR_DEFAULT, saddr, eaddr, &msg, tap_omac, msglen);
}
/**
diff --git a/vu_common.c b/vu_common.c
index 8adcf42b954b..7239cb42f38b 100644
--- a/vu_common.c
+++ b/vu_common.c
@@ -198,12 +198,13 @@ static void vu_handle_tx(struct vu_dev *vdev, int index,
}
data = IOV_TAIL(elem[count].out_sg, elem[count].out_num, 0);
- if (IOV_DROP_HEADER(&data, struct virtio_net_hdr_mrg_rxbuf))
- tap_add_packet(vdev->context, &data, now);
+ if (IOV_DROP_HEADER(&data, struct virtio_net_hdr_mrg_rxbuf)) {
+ tap_add_packet(vdev->context, QPAIR_DEFAULT, &data, now);
+ }
count++;
}
- tap_handler(vdev->context, now);
+ tap_handler(vdev->context, QPAIR_DEFAULT, now);
if (count) {
int i;
--
2.54.0
next prev parent reply other threads:[~2026-07-31 16:16 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-31 16:16 [PATCH v6 00/12] vhost-user: Add multiqueue support Laurent Vivier
2026-07-31 16:16 ` [PATCH v6 01/12] tap: Remove pool parameter from tap4_handler() and tap6_handler() Laurent Vivier
2026-07-31 16:16 ` [PATCH v6 02/12] vhost-user: Advertise multiqueue support Laurent Vivier
2026-07-31 16:16 ` [PATCH v6 03/12] test: Add multiqueue support to vhost-user test infrastructure Laurent Vivier
2026-07-31 16:16 ` Laurent Vivier [this message]
2026-07-31 16:16 ` [PATCH v6 05/12] arp: Pass queue pair explicitly through ARP send path Laurent Vivier
2026-07-31 16:16 ` [PATCH v6 06/12] tcp: Pass queue pair explicitly through TCP " Laurent Vivier
2026-07-31 16:16 ` [PATCH v6 07/12] udp: Pass queue pair explicitly through UDP " Laurent Vivier
2026-07-31 16:16 ` [PATCH v6 08/12] dhcp/dhcpv6: Pass queue pair explicitly through DHCP " Laurent Vivier
2026-07-31 16:16 ` [PATCH v6 09/12] icmp: Pass queue pair explicitly through ICMP " Laurent Vivier
2026-07-31 16:16 ` [PATCH v6 10/12] ndp: Pass queue pair explicitly through NDP " Laurent Vivier
2026-07-31 16:16 ` [PATCH v6 11/12] flow: Add queue pair tracking to flow management Laurent Vivier
2026-07-31 16:16 ` [PATCH v6 12/12] flow: Derive epoll fd from queue pair, removing epollid field Laurent Vivier
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