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Date: Wed, 8 Nov 2023 15:30:43 +0100
From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To: Tushar Vyavahare <tushar.vyavahare@...el.com>
CC: <bpf@...r.kernel.org>, <netdev@...r.kernel.org>, <bjorn@...nel.org>,
<magnus.karlsson@...el.com>, <jonathan.lemon@...il.com>,
<davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>,
<ast@...nel.org>, <daniel@...earbox.net>, <tirthendu.sarkar@...el.com>
Subject: Re: [PATCH bpf-next] selftests/xsk: fix for SEND_RECEIVE_UNALIGNED
test.
On Fri, Nov 03, 2023 at 02:29:36PM +0000, Tushar Vyavahare wrote:
> Fix test broken by shared umem test and framework enhancement commit.
>
> Correct the current implementation of pkt_stream_replace_half() by
> ensuring that nb_valid_entries are not set to half, as this is not true
> for all the tests.
Please be more specific - so what is the expected value for
nb_valid_entries for unaligned mode test then, if not the half?
>
> Create a new function called pkt_modify() that allows for packet
> modification to meet specific requirements while ensuring the accurate
> maintenance of the valid packet count to prevent inconsistencies in packet
> tracking.
>
> Fixes: 6d198a89c004 ("selftests/xsk: Add a test for shared umem feature")
> Reported-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
> Signed-off-by: Tushar Vyavahare <tushar.vyavahare@...el.com>
> ---
> tools/testing/selftests/bpf/xskxceiver.c | 71 ++++++++++++++++--------
> 1 file changed, 47 insertions(+), 24 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/xskxceiver.c b/tools/testing/selftests/bpf/xskxceiver.c
> index 591ca9637b23..f7d3a4a9013f 100644
> --- a/tools/testing/selftests/bpf/xskxceiver.c
> +++ b/tools/testing/selftests/bpf/xskxceiver.c
> @@ -634,16 +634,35 @@ static u32 pkt_nb_frags(u32 frame_size, struct pkt_stream *pkt_stream, struct pk
> return nb_frags;
> }
>
> -static void pkt_set(struct pkt_stream *pkt_stream, struct pkt *pkt, int offset, u32 len)
> +static bool pkt_valid(bool unaligned_mode, int offset, u32 len)
kinda confusing to have is_pkt_valid() and pkt_valid() functions...
maybe name this as set_pkt_valid() ? doesn't help much but anyways.
> +{
> + if (len > MAX_ETH_JUMBO_SIZE || (!unaligned_mode && offset < 0))
> + return false;
> +
> + return true;
> +}
> +
> +static void pkt_set(struct pkt_stream *pkt_stream, struct xsk_umem_info *umem, struct pkt *pkt,
> + int offset, u32 len)
How about adding a bool unaligned to pkt_stream instead of passing whole
xsk_umem_info to pkt_set - wouldn't this make the diff smaller?
> {
> pkt->offset = offset;
> pkt->len = len;
> - if (len > MAX_ETH_JUMBO_SIZE) {
> - pkt->valid = false;
> - } else {
> - pkt->valid = true;
> +
> + pkt->valid = pkt_valid(umem->unaligned_mode, offset, len);
> + if (pkt->valid)
> pkt_stream->nb_valid_entries++;
> - }
> +}
> +
> +static void pkt_modify(struct pkt_stream *pkt_stream, struct xsk_umem_info *umem, struct pkt *pkt,
> + int offset, u32 len)
> +{
> + bool mod_valid;
> +
> + pkt->offset = offset;
> + pkt->len = len;
> + mod_valid = pkt_valid(umem->unaligned_mode, offset, len);
double space
> + pkt_stream->nb_valid_entries += mod_valid - pkt->valid;
> + pkt->valid = mod_valid;
> }
>
> static u32 pkt_get_buffer_len(struct xsk_umem_info *umem, u32 len)
> @@ -651,7 +670,8 @@ static u32 pkt_get_buffer_len(struct xsk_umem_info *umem, u32 len)
> return ceil_u32(len, umem->frame_size) * umem->frame_size;
> }
>
> -static struct pkt_stream *__pkt_stream_generate(u32 nb_pkts, u32 pkt_len, u32 nb_start, u32 nb_off)
> +static struct pkt_stream *__pkt_stream_generate(struct xsk_umem_info *umem, u32 nb_pkts,
> + u32 pkt_len, u32 nb_start, u32 nb_off)
> {
> struct pkt_stream *pkt_stream;
> u32 i;
> @@ -665,30 +685,31 @@ static struct pkt_stream *__pkt_stream_generate(u32 nb_pkts, u32 pkt_len, u32 nb
> for (i = 0; i < nb_pkts; i++) {
> struct pkt *pkt = &pkt_stream->pkts[i];
>
> - pkt_set(pkt_stream, pkt, 0, pkt_len);
> + pkt_set(pkt_stream, umem, pkt, 0, pkt_len);
> pkt->pkt_nb = nb_start + i * nb_off;
> }
>
> return pkt_stream;
> }
>
> -static struct pkt_stream *pkt_stream_generate(u32 nb_pkts, u32 pkt_len)
> +static struct pkt_stream *pkt_stream_generate(struct xsk_umem_info *umem, u32 nb_pkts, u32 pkt_len)
> {
> - return __pkt_stream_generate(nb_pkts, pkt_len, 0, 1);
> + return __pkt_stream_generate(umem, nb_pkts, pkt_len, 0, 1);
> }
>
> -static struct pkt_stream *pkt_stream_clone(struct pkt_stream *pkt_stream)
> +static struct pkt_stream *pkt_stream_clone(struct pkt_stream *pkt_stream,
> + struct xsk_umem_info *umem)
> {
> - return pkt_stream_generate(pkt_stream->nb_pkts, pkt_stream->pkts[0].len);
> + return pkt_stream_generate(umem, pkt_stream->nb_pkts, pkt_stream->pkts[0].len);
> }
>
> static void pkt_stream_replace(struct test_spec *test, u32 nb_pkts, u32 pkt_len)
> {
> struct pkt_stream *pkt_stream;
>
> - pkt_stream = pkt_stream_generate(nb_pkts, pkt_len);
> + pkt_stream = pkt_stream_generate(test->ifobj_rx->umem, nb_pkts, pkt_len);
> test->ifobj_tx->xsk->pkt_stream = pkt_stream;
> - pkt_stream = pkt_stream_generate(nb_pkts, pkt_len);
> + pkt_stream = pkt_stream_generate(test->ifobj_tx->umem, nb_pkts, pkt_len);
> test->ifobj_rx->xsk->pkt_stream = pkt_stream;
> }
>
> @@ -698,12 +719,11 @@ static void __pkt_stream_replace_half(struct ifobject *ifobj, u32 pkt_len,
> struct pkt_stream *pkt_stream;
> u32 i;
>
> - pkt_stream = pkt_stream_clone(ifobj->xsk->pkt_stream);
> + pkt_stream = pkt_stream_clone(ifobj->xsk->pkt_stream, ifobj->umem);
> for (i = 1; i < ifobj->xsk->pkt_stream->nb_pkts; i += 2)
> - pkt_set(pkt_stream, &pkt_stream->pkts[i], offset, pkt_len);
> + pkt_modify(pkt_stream, ifobj->umem, &pkt_stream->pkts[i], offset, pkt_len);
>
> ifobj->xsk->pkt_stream = pkt_stream;
> - pkt_stream->nb_valid_entries /= 2;
> }
>
> static void pkt_stream_replace_half(struct test_spec *test, u32 pkt_len, int offset)
> @@ -715,9 +735,10 @@ static void pkt_stream_replace_half(struct test_spec *test, u32 pkt_len, int off
> static void pkt_stream_receive_half(struct test_spec *test)
> {
> struct pkt_stream *pkt_stream = test->ifobj_tx->xsk->pkt_stream;
> + struct xsk_umem_info *umem = test->ifobj_rx->umem;
> u32 i;
>
> - test->ifobj_rx->xsk->pkt_stream = pkt_stream_generate(pkt_stream->nb_pkts,
> + test->ifobj_rx->xsk->pkt_stream = pkt_stream_generate(umem, pkt_stream->nb_pkts,
> pkt_stream->pkts[0].len);
> pkt_stream = test->ifobj_rx->xsk->pkt_stream;
> for (i = 1; i < pkt_stream->nb_pkts; i += 2)
> @@ -733,12 +754,12 @@ static void pkt_stream_even_odd_sequence(struct test_spec *test)
>
> for (i = 0; i < test->nb_sockets; i++) {
> pkt_stream = test->ifobj_tx->xsk_arr[i].pkt_stream;
> - pkt_stream = __pkt_stream_generate(pkt_stream->nb_pkts / 2,
> + pkt_stream = __pkt_stream_generate(test->ifobj_tx->umem, pkt_stream->nb_pkts / 2,
> pkt_stream->pkts[0].len, i, 2);
> test->ifobj_tx->xsk_arr[i].pkt_stream = pkt_stream;
>
> pkt_stream = test->ifobj_rx->xsk_arr[i].pkt_stream;
> - pkt_stream = __pkt_stream_generate(pkt_stream->nb_pkts / 2,
> + pkt_stream = __pkt_stream_generate(test->ifobj_rx->umem, pkt_stream->nb_pkts / 2,
> pkt_stream->pkts[0].len, i, 2);
> test->ifobj_rx->xsk_arr[i].pkt_stream = pkt_stream;
> }
> @@ -1961,7 +1982,8 @@ static int testapp_stats_tx_invalid_descs(struct test_spec *test)
> static int testapp_stats_rx_full(struct test_spec *test)
> {
> pkt_stream_replace(test, DEFAULT_UMEM_BUFFERS + DEFAULT_UMEM_BUFFERS / 2, MIN_PKT_SIZE);
> - test->ifobj_rx->xsk->pkt_stream = pkt_stream_generate(DEFAULT_UMEM_BUFFERS, MIN_PKT_SIZE);
> + test->ifobj_rx->xsk->pkt_stream = pkt_stream_generate(test->ifobj_rx->umem,
> + DEFAULT_UMEM_BUFFERS, MIN_PKT_SIZE);
>
> test->ifobj_rx->xsk->rxqsize = DEFAULT_UMEM_BUFFERS;
> test->ifobj_rx->release_rx = false;
> @@ -1972,7 +1994,8 @@ static int testapp_stats_rx_full(struct test_spec *test)
> static int testapp_stats_fill_empty(struct test_spec *test)
> {
> pkt_stream_replace(test, DEFAULT_UMEM_BUFFERS + DEFAULT_UMEM_BUFFERS / 2, MIN_PKT_SIZE);
> - test->ifobj_rx->xsk->pkt_stream = pkt_stream_generate(DEFAULT_UMEM_BUFFERS, MIN_PKT_SIZE);
> + test->ifobj_rx->xsk->pkt_stream = pkt_stream_generate(test->ifobj_rx->umem,
> + DEFAULT_UMEM_BUFFERS, MIN_PKT_SIZE);
>
> test->ifobj_rx->use_fill_ring = false;
> test->ifobj_rx->validation_func = validate_fill_empty;
> @@ -2526,8 +2549,8 @@ int main(int argc, char **argv)
> init_iface(ifobj_tx, worker_testapp_validate_tx);
>
> test_spec_init(&test, ifobj_tx, ifobj_rx, 0, &tests[0]);
> - tx_pkt_stream_default = pkt_stream_generate(DEFAULT_PKT_CNT, MIN_PKT_SIZE);
> - rx_pkt_stream_default = pkt_stream_generate(DEFAULT_PKT_CNT, MIN_PKT_SIZE);
> + tx_pkt_stream_default = pkt_stream_generate(ifobj_tx->umem, DEFAULT_PKT_CNT, MIN_PKT_SIZE);
> + rx_pkt_stream_default = pkt_stream_generate(ifobj_rx->umem, DEFAULT_PKT_CNT, MIN_PKT_SIZE);
> if (!tx_pkt_stream_default || !rx_pkt_stream_default)
> exit_with_error(ENOMEM);
> test.tx_pkt_stream_default = tx_pkt_stream_default;
> --
> 2.34.1
>
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