Richard Gobert wrote:
Added flush id selftests to test different cases where DF flag is set or unset and id value changes in the following packets. All cases where the packets should coalesce or should not coalesce are tested.
Signed-off-by: Richard Gobert richardbgobert@gmail.com
tools/testing/selftests/net/gro.c | 147 ++++++++++++++++++++++++++++++ 1 file changed, 147 insertions(+)
diff --git a/tools/testing/selftests/net/gro.c b/tools/testing/selftests/net/gro.c index 353e1e867fbb..5dc7b539ccbf 100644 --- a/tools/testing/selftests/net/gro.c +++ b/tools/testing/selftests/net/gro.c @@ -617,6 +617,123 @@ static void add_ipv6_exthdr(void *buf, void *optpkt, __u8 exthdr_type, char *ext iph->payload_len = htons(ntohs(iph->payload_len) + MIN_EXTHDR_SIZE); } +static void fix_ip4_checksum(struct iphdr *iph) +{
- iph->check = 0;
- iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);
+}
+static void send_flush_id_case(int fd, struct sockaddr_ll *daddr, int tcase) +{
- static char buf1[MAX_HDR_LEN + PAYLOAD_LEN];
- static char buf2[MAX_HDR_LEN + PAYLOAD_LEN];
- static char buf3[MAX_HDR_LEN + PAYLOAD_LEN];
- bool send_three = false;
- struct iphdr *iph1;
- struct iphdr *iph2;
- struct iphdr *iph3;
- iph1 = (struct iphdr *)(buf1 + ETH_HLEN);
- iph2 = (struct iphdr *)(buf2 + ETH_HLEN);
- iph3 = (struct iphdr *)(buf3 + ETH_HLEN);
- create_packet(buf1, 0, 0, PAYLOAD_LEN, 0);
- create_packet(buf2, PAYLOAD_LEN, 0, PAYLOAD_LEN, 0);
- create_packet(buf3, PAYLOAD_LEN * 2, 0, PAYLOAD_LEN, 0);
- switch (tcase) {
- case 0: /* DF=1, Incrementing - should coalesce */
iph1->frag_off |= htons(IP_DF);iph1->id = htons(8);fix_ip4_checksum(iph1);iph2->frag_off |= htons(IP_DF);iph2->id = htons(9);fix_ip4_checksum(iph2);break;- case 1: /* DF=1, Fixed - should coalesce */
iph1->frag_off |= htons(IP_DF);iph1->id = htons(8);fix_ip4_checksum(iph1);iph2->frag_off |= htons(IP_DF);iph2->id = htons(8);fix_ip4_checksum(iph2);break;- case 2: /* DF=0, Incrementing - should coalesce */
iph1->frag_off &= ~htons(IP_DF);iph1->id = htons(8);fix_ip4_checksum(iph1);iph2->frag_off &= ~htons(IP_DF);iph2->id = htons(9);fix_ip4_checksum(iph2);break;- case 3: /* DF=0, Fixed - should not coalesce */
iph1->frag_off &= ~htons(IP_DF);iph1->id = htons(8);fix_ip4_checksum(iph1);iph2->frag_off &= ~htons(IP_DF);iph2->id = htons(8);fix_ip4_checksum(iph2);break;- case 4: /* DF=1, two packets incrementing, and one fixed - should
* coalesce only the first two packets*/iph1->frag_off |= htons(IP_DF);iph1->id = htons(8);fix_ip4_checksum(iph1);iph2->frag_off |= htons(IP_DF);iph2->id = htons(9);fix_ip4_checksum(iph2);iph3->frag_off |= htons(IP_DF);iph3->id = htons(9);fix_ip4_checksum(iph3);send_three = true;break;- case 5: /* DF=1, two packets fixed, and one incrementing - should
* coalesce only the first two packets*/iph1->frag_off |= htons(IP_DF);iph1->id = htons(8);fix_ip4_checksum(iph1);iph2->frag_off |= htons(IP_DF);iph2->id = htons(8);fix_ip4_checksum(iph2);iph3->frag_off |= htons(IP_DF);iph3->id = htons(9);fix_ip4_checksum(iph3);send_three = true;break;- }
Consider moving the fix_ip4_checksum calls out of the switch to reduce duplication.
- write_packet(fd, buf1, total_hdr_len + PAYLOAD_LEN, daddr);
- write_packet(fd, buf2, total_hdr_len + PAYLOAD_LEN, daddr);
- if (send_three)
write_packet(fd, buf3, total_hdr_len + PAYLOAD_LEN, daddr);+}
+static void test_flush_id(int fd, struct sockaddr_ll *daddr, char *fin_pkt) +{
- for (int i = 0; i < 6; i++) {
Please avoid unnamed magic constants. Something like
const int num_flush_id_cases = 6; /* See switch in send_flush_id_case */
Or even define an enum with named tests and and _MAX val. It's verbose, but helpful to readers.
sleep(1);send_flush_id_case(fd, daddr, i);sleep(1);write_packet(fd, fin_pkt, total_hdr_len, daddr);- }
+}