From cc801fb38f46157b83060b96ee99fa1669a6f42d Mon Sep 17 00:00:00 2001 From: David Gibson Date: Tue, 21 May 2024 15:57:08 +1000 Subject: [PATCH] tcp: Remove interim 'tapside' field from connection We recently introduced this field to keep track of which side of a TCP flow is the guest/tap facing one. Now that we generically record which pif each side of each flow is connected to, we can easily derive that, and no longer need to keep track of it explicitly. Signed-off-by: David Gibson Signed-off-by: Stefano Brivio --- tcp.c | 12 ++++++------ tcp_conn.h | 2 -- 2 files changed, 6 insertions(+), 8 deletions(-) diff --git a/tcp.c b/tcp.c index 969f5b1..06acb41 100644 --- a/tcp.c +++ b/tcp.c @@ -368,6 +368,8 @@ #define OPT_SACK 5 #define OPT_TS 8 +#define TAPSIDE(conn_) ((conn_)->f.pif[1] == PIF_TAP) + #define CONN_V4(conn) (!!inany_v4(&(conn)->faddr)) #define CONN_V6(conn) (!CONN_V4(conn)) #define CONN_IS_CLOSING(conn) \ @@ -577,7 +579,7 @@ static int tcp_epoll_ctl(const struct ctx *c, struct tcp_tap_conn *conn) { int m = conn->in_epoll ? EPOLL_CTL_MOD : EPOLL_CTL_ADD; union epoll_ref ref = { .type = EPOLL_TYPE_TCP, .fd = conn->sock, - .flowside = FLOW_SIDX(conn, !conn->tapside), }; + .flowside = FLOW_SIDX(conn, !TAPSIDE(conn)), }; struct epoll_event ev = { .data.u64 = ref.u64 }; if (conn->events == CLOSED) { @@ -1130,8 +1132,8 @@ static uint64_t tcp_conn_hash(const struct ctx *c, static inline unsigned tcp_hash_probe(const struct ctx *c, const struct tcp_tap_conn *conn) { - flow_sidx_t sidx = FLOW_SIDX(conn, conn->tapside); unsigned b = tcp_conn_hash(c, conn) % TCP_HASH_TABLE_SIZE; + flow_sidx_t sidx = FLOW_SIDX(conn, TAPSIDE(conn)); /* Linear probing */ while (!flow_sidx_eq(tc_hash[b], FLOW_SIDX_NONE) && @@ -1150,7 +1152,7 @@ static void tcp_hash_insert(const struct ctx *c, struct tcp_tap_conn *conn) { unsigned b = tcp_hash_probe(c, conn); - tc_hash[b] = FLOW_SIDX(conn, conn->tapside); + tc_hash[b] = FLOW_SIDX(conn, TAPSIDE(conn)); flow_dbg(conn, "hash table insert: sock %i, bucket: %u", conn->sock, b); } @@ -2004,7 +2006,6 @@ static void tcp_conn_from_tap(struct ctx *c, sa_family_t af, flow_target(flow, PIF_HOST); conn = FLOW_SET_TYPE(flow, FLOW_TCP, tcp); - conn->tapside = INISIDE; conn->sock = s; conn->timer = -1; conn_event(c, conn, TAP_SYN_RCVD); @@ -2721,7 +2722,6 @@ static void tcp_tap_conn_from_sock(struct ctx *c, in_port_t dstport, flow_target(flow, PIF_TAP); conn = FLOW_SET_TYPE(flow, FLOW_TCP, tcp); - conn->tapside = TGTSIDE; conn->sock = s; conn->timer = -1; conn->ws_to_tap = conn->ws_from_tap = 0; @@ -2875,7 +2875,7 @@ void tcp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events) struct tcp_tap_conn *conn = CONN(ref.flowside.flow); ASSERT(conn->f.type == FLOW_TCP); - ASSERT(ref.flowside.side == !conn->tapside); + ASSERT(conn->f.pif[ref.flowside.side] != PIF_TAP); if (conn->events == CLOSED) return; diff --git a/tcp_conn.h b/tcp_conn.h index e8c51c3..5f8c8fb 100644 --- a/tcp_conn.h +++ b/tcp_conn.h @@ -13,7 +13,6 @@ * struct tcp_tap_conn - Descriptor for a TCP connection (not spliced) * @f: Generic flow information * @in_epoll: Is the connection in the epoll set? - * @tapside: Which side of the flow faces the tap/guest interface * @tap_mss: MSS advertised by tap/guest, rounded to 2 ^ TCP_MSS_BITS * @sock: Socket descriptor number * @events: Connection events, implying connection states @@ -40,7 +39,6 @@ struct tcp_tap_conn { struct flow_common f; bool in_epoll :1; - unsigned tapside :1; #define TCP_RETRANS_BITS 3 unsigned int retrans :TCP_RETRANS_BITS;