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[34.85.165.172]) by smtp.gmail.com with ESMTPSA id 00721157ae682-7a36e229135sm22909397b3.3.2026.04.03.08.26.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Apr 2026 08:26:01 -0700 (PDT) Date: Fri, 03 Apr 2026 11:26:01 -0400 From: Willem de Bruijn To: Joe Damato , netdev@vger.kernel.org, "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Shuah Khan Cc: andrew+netdev@lunn.ch, linux-kernel@vger.kernel.org, willemb@google.com, Joe Damato , linux-kselftest@vger.kernel.org Message-ID: In-Reply-To: <20260402232203.2004496-3-joe@dama.to> References: <20260402232203.2004496-1-joe@dama.to> <20260402232203.2004496-3-joe@dama.to> Subject: Re: [net-next 2/3] selftests/net: Test PACKET_STATISTICS drops Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Joe Damato wrote: > Extend psock_snd to test drops by setting a tiny receive buffer and > sending a large burst of packets. > > Signed-off-by: Joe Damato > --- > tools/testing/selftests/net/psock_snd.c | 52 ++++++++++++++++++++---- > tools/testing/selftests/net/psock_snd.sh | 5 +++ > 2 files changed, 48 insertions(+), 9 deletions(-) > > diff --git a/tools/testing/selftests/net/psock_snd.c b/tools/testing/selftests/net/psock_snd.c > index 5be481a3d2bd..7bbce274b9f0 100644 > --- a/tools/testing/selftests/net/psock_snd.c > +++ b/tools/testing/selftests/net/psock_snd.c > @@ -39,6 +39,7 @@ static bool cfg_use_gso; > static bool cfg_use_qdisc_bypass; > static bool cfg_use_vlan; > static bool cfg_use_vnet; > +static bool cfg_drop; > > static char *cfg_ifname = "lo"; > static int cfg_mtu = 1500; > @@ -49,6 +50,8 @@ static uint16_t cfg_port = 8000; > /* test sending up to max mtu + 1 */ > #define TEST_SZ (sizeof(struct virtio_net_hdr) + ETH_HLEN + ETH_MAX_MTU + 1) > > +#define BURST_CNT (1000) > + > static char tbuf[TEST_SZ], rbuf[TEST_SZ]; > > static unsigned long add_csum_hword(const uint16_t *start, int num_u16) > @@ -212,13 +215,14 @@ static void do_send(int fd, char *buf, int len) > if (ret != len) > error(1, 0, "write: %u %u", ret, len); > > - fprintf(stderr, "tx: %u\n", ret); > + if (!cfg_drop) > + fprintf(stderr, "tx: %u\n", ret); > } > > -static int do_tx(void) > +static int do_tx(bool burst) > { > const int one = 1; > - int fd, len; > + int i, fd, len; > > fd = socket(PF_PACKET, cfg_use_dgram ? SOCK_DGRAM : SOCK_RAW, 0); > if (fd == -1) > @@ -242,6 +246,10 @@ static int do_tx(void) > > do_send(fd, tbuf, len); > > + if (burst) > + for (i = 0; i < BURST_CNT; i++) > + do_send(fd, tbuf, len); > + > if (close(fd)) > error(1, errno, "close t"); > > @@ -290,6 +298,7 @@ static void do_rx(int fd, int expected_len, char *expected) > static int setup_sniffer(void) > { > struct timeval tv = { .tv_usec = 100 * 1000 }; > + const int one = 1; > int fd; > > fd = socket(PF_PACKET, SOCK_RAW, 0); > @@ -299,6 +308,10 @@ static int setup_sniffer(void) > if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv))) > error(1, errno, "setsockopt rcv timeout"); > > + if (cfg_drop) > + if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &one, sizeof(one))) > + error(1, errno, "setsockopt SO_RCVBUF"); > + > pair_udp_setfilter(fd); > do_bind(fd); > > @@ -309,7 +322,7 @@ static void parse_opts(int argc, char **argv) > { > int c; > > - while ((c = getopt(argc, argv, "bcCdgl:qt:vV")) != -1) { > + while ((c = getopt(argc, argv, "bcCdDgl:qt:vV")) != -1) { > switch (c) { > case 'b': > cfg_use_bind = true; > @@ -323,6 +336,9 @@ static void parse_opts(int argc, char **argv) > case 'd': > cfg_use_dgram = true; > break; > + case 'D': > + cfg_drop = true; > + break; > case 'g': > cfg_use_gso = true; > break; > @@ -367,11 +383,23 @@ static void check_packet_stats(int fd) > if (getsockopt(fd, SOL_PACKET, PACKET_STATISTICS, &st, &len)) > error(1, errno, "getsockopt packet statistics"); > > - if (st.tp_packets != 1) > - error(1, 0, "stats: tp_packets %u != 1", st.tp_packets); > + if (cfg_drop) { > + /* PACKET_STATISTICS reports all packets seen (including > + * drops) in tp_packets > + */ > + if (st.tp_packets < st.tp_drops) > + error(1, 0, "stats: tp_packets %u < tp_drops %u", > + st.tp_packets, st.tp_drops); > > - if (st.tp_drops != 0) > - error(1, 0, "stats: tp_drops %u != 0", st.tp_drops); > + if (st.tp_drops == 0) > + error(1, 0, "stats: expected drops but tp_drops == 0"); > + } else { > + if (st.tp_packets != 1) > + error(1, 0, "stats: tp_packets %u != 1", st.tp_packets); > + > + if (st.tp_drops != 0) > + error(1, 0, "stats: tp_drops %u != 0", st.tp_drops); > + } > > /* verify clear on read */ > memset(&st, 0xff, sizeof(st)); > @@ -394,7 +422,12 @@ static void run_test(void) > fdr = setup_rx(); > fds = setup_sniffer(); > > - total_len = do_tx(); > + total_len = do_tx(cfg_drop); only if respinning: no need to pass global cfg_.. variables through function arguments. > + > + if (cfg_drop) { > + check_packet_stats(fds); > + goto out; > + } can this not use the check_packet_stats added in the previous patch right below? > > /* BPF filter accepts only this length, vlan changes MAC */ > if (cfg_payload_len == DATA_LEN && !cfg_use_vlan) { > @@ -405,6 +438,7 @@ static void run_test(void) > > do_rx(fdr, cfg_payload_len, tbuf + total_len - cfg_payload_len); > > +out: > if (close(fds)) > error(1, errno, "close s"); > if (close(fdr)) > diff --git a/tools/testing/selftests/net/psock_snd.sh b/tools/testing/selftests/net/psock_snd.sh > index 1cbfeb5052ec..b6ef12fad5d5 100755 > --- a/tools/testing/selftests/net/psock_snd.sh > +++ b/tools/testing/selftests/net/psock_snd.sh > @@ -92,4 +92,9 @@ echo "raw gso max size" > echo "raw gso max size + 1 (expected to fail)" > (! ./in_netns.sh ./psock_snd -v -c -g -l "${max_mss_exceeds}") > > +# test drops statistics > + > +echo "test drops statistics" > +./in_netns.sh ./psock_snd -D > + > echo "OK. All tests passed" > -- > 2.52.0 >