On Mon, Sep 20, 2021 at 8:19 PM Harman Kalra <hka...@marvell.com> wrote:
>
> Issue has been observed where fields of indirect buffers are
> accessed after being set free by the diver. Also fixing freeing
> of direct buffers to correct aura.
>
> Fixes: 5cbe184802aa ("net/octeontx: support fast mbuf free")
> Cc: sta...@dpdk.org
>
> Signed-off-by: David George <david.geo...@sophos.com>
> Signed-off-by: Harman Kalra <hka...@marvell.com>
Acked-by: Jerin Jacob <jer...@marvell.com>
Applied to dpdk-next-net-mrvl/for-next-net. Thanks
> ---
> drivers/net/octeontx/octeontx_rxtx.h | 69 ++++++++++++++++++----------
> 1 file changed, 46 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/net/octeontx/octeontx_rxtx.h
> b/drivers/net/octeontx/octeontx_rxtx.h
> index 2ed28ea563..e0723ac26a 100644
> --- a/drivers/net/octeontx/octeontx_rxtx.h
> +++ b/drivers/net/octeontx/octeontx_rxtx.h
> @@ -161,7 +161,7 @@ ptype_table[PTYPE_SIZE][PTYPE_SIZE][PTYPE_SIZE] = {
>
>
> static __rte_always_inline uint64_t
> -octeontx_pktmbuf_detach(struct rte_mbuf *m)
> +octeontx_pktmbuf_detach(struct rte_mbuf *m, struct rte_mbuf **m_tofree)
> {
> struct rte_mempool *mp = m->pool;
> uint32_t mbuf_size, buf_len;
> @@ -171,6 +171,8 @@ octeontx_pktmbuf_detach(struct rte_mbuf *m)
>
> /* Update refcount of direct mbuf */
> md = rte_mbuf_from_indirect(m);
> + /* The real data will be in the direct buffer, inform callers this */
> + *m_tofree = md;
> refcount = rte_mbuf_refcnt_update(md, -1);
>
> priv_size = rte_pktmbuf_priv_size(mp);
> @@ -203,18 +205,18 @@ octeontx_pktmbuf_detach(struct rte_mbuf *m)
> }
>
> static __rte_always_inline uint64_t
> -octeontx_prefree_seg(struct rte_mbuf *m)
> +octeontx_prefree_seg(struct rte_mbuf *m, struct rte_mbuf **m_tofree)
> {
> if (likely(rte_mbuf_refcnt_read(m) == 1)) {
> if (!RTE_MBUF_DIRECT(m))
> - return octeontx_pktmbuf_detach(m);
> + return octeontx_pktmbuf_detach(m, m_tofree);
>
> m->next = NULL;
> m->nb_segs = 1;
> return 0;
> } else if (rte_mbuf_refcnt_update(m, -1) == 0) {
> if (!RTE_MBUF_DIRECT(m))
> - return octeontx_pktmbuf_detach(m);
> + return octeontx_pktmbuf_detach(m, m_tofree);
>
> rte_mbuf_refcnt_set(m, 1);
> m->next = NULL;
> @@ -315,6 +317,14 @@ __octeontx_xmit_prepare(struct rte_mbuf *tx_pkt,
> uint64_t *cmd_buf,
> const uint16_t flag)
> {
> uint16_t gaura_id, nb_desc = 0;
> + struct rte_mbuf *m_tofree;
> + rte_iova_t iova;
> + uint16_t data_len;
> +
> + m_tofree = tx_pkt;
> +
> + data_len = tx_pkt->data_len;
> + iova = rte_mbuf_data_iova(tx_pkt);
>
> /* Setup PKO_SEND_HDR_S */
> cmd_buf[nb_desc++] = tx_pkt->data_len & 0xffff;
> @@ -329,22 +339,23 @@ __octeontx_xmit_prepare(struct rte_mbuf *tx_pkt,
> uint64_t *cmd_buf,
> * not, as SG_DESC[I] and SEND_HDR[II] are clear.
> */
> if (flag & OCCTX_TX_OFFLOAD_MBUF_NOFF_F)
> - cmd_buf[0] |= (octeontx_prefree_seg(tx_pkt) <<
> + cmd_buf[0] |= (octeontx_prefree_seg(tx_pkt, &m_tofree) <<
> 58);
>
> /* Mark mempool object as "put" since it is freed by PKO */
> if (!(cmd_buf[0] & (1ULL << 58)))
> - __mempool_check_cookies(tx_pkt->pool, (void **)&tx_pkt,
> + __mempool_check_cookies(m_tofree->pool, (void **)&m_tofree,
> 1, 0);
> /* Get the gaura Id */
> - gaura_id =
> octeontx_fpa_bufpool_gaura((uintptr_t)tx_pkt->pool->pool_id);
> + gaura_id =
> +
> octeontx_fpa_bufpool_gaura((uintptr_t)m_tofree->pool->pool_id);
>
> /* Setup PKO_SEND_BUFLINK_S */
> cmd_buf[nb_desc++] = PKO_SEND_BUFLINK_SUBDC |
> PKO_SEND_BUFLINK_LDTYPE(0x1ull) |
> PKO_SEND_BUFLINK_GAUAR((long)gaura_id) |
> - tx_pkt->data_len;
> - cmd_buf[nb_desc++] = rte_mbuf_data_iova(tx_pkt);
> + data_len;
> + cmd_buf[nb_desc++] = iova;
>
> return nb_desc;
> }
> @@ -355,7 +366,9 @@ __octeontx_xmit_mseg_prepare(struct rte_mbuf *tx_pkt,
> uint64_t *cmd_buf,
> {
> uint16_t nb_segs, nb_desc = 0;
> uint16_t gaura_id, len = 0;
> - struct rte_mbuf *m_next = NULL;
> + struct rte_mbuf *m_next = NULL, *m_tofree;
> + rte_iova_t iova;
> + uint16_t data_len;
>
> nb_segs = tx_pkt->nb_segs;
> /* Setup PKO_SEND_HDR_S */
> @@ -369,40 +382,50 @@ __octeontx_xmit_mseg_prepare(struct rte_mbuf *tx_pkt,
> uint64_t *cmd_buf,
>
> do {
> m_next = tx_pkt->next;
> - /* To handle case where mbufs belong to diff pools, like
> - * fragmentation
> + /* Get TX parameters up front, octeontx_prefree_seg might
> change
> + * them
> */
> - gaura_id = octeontx_fpa_bufpool_gaura((uintptr_t)
> - tx_pkt->pool->pool_id);
> + m_tofree = tx_pkt;
> + data_len = tx_pkt->data_len;
> + iova = rte_mbuf_data_iova(tx_pkt);
>
> /* Setup PKO_SEND_GATHER_S */
> - cmd_buf[nb_desc] = PKO_SEND_GATHER_SUBDC |
> - PKO_SEND_GATHER_LDTYPE(0x1ull) |
> - PKO_SEND_GATHER_GAUAR((long)gaura_id) |
> - tx_pkt->data_len;
> + cmd_buf[nb_desc] = 0;
>
> /* SG_DESC[I] bit controls if buffer is to be freed or
> * not, as SEND_HDR[DF] and SEND_HDR[II] are clear.
> */
> if (flag & OCCTX_TX_OFFLOAD_MBUF_NOFF_F) {
> cmd_buf[nb_desc] |=
> - (octeontx_prefree_seg(tx_pkt) << 57);
> + (octeontx_prefree_seg(tx_pkt, &m_tofree) <<
> 57);
> }
>
> + /* To handle case where mbufs belong to diff pools, like
> + * fragmentation
> + */
> + gaura_id = octeontx_fpa_bufpool_gaura((uintptr_t)
> + m_tofree->pool->pool_id);
> +
> + /* Setup PKO_SEND_GATHER_S */
> + cmd_buf[nb_desc] |= PKO_SEND_GATHER_SUBDC |
> + PKO_SEND_GATHER_LDTYPE(0x1ull) |
> + PKO_SEND_GATHER_GAUAR((long)gaura_id) |
> + data_len;
> +
> /* Mark mempool object as "put" since it is freed by
> * PKO.
> */
> if (!(cmd_buf[nb_desc] & (1ULL << 57))) {
> tx_pkt->next = NULL;
> - __mempool_check_cookies(tx_pkt->pool,
> - (void **)&tx_pkt, 1, 0);
> + __mempool_check_cookies(m_tofree->pool,
> + (void **)&m_tofree, 1, 0);
> }
> nb_desc++;
>
> - cmd_buf[nb_desc++] = rte_mbuf_data_iova(tx_pkt);
> + cmd_buf[nb_desc++] = iova;
>
> nb_segs--;
> - len += tx_pkt->data_len;
> + len += data_len;
> tx_pkt = m_next;
> } while (nb_segs);
>
> --
> 2.18.0
>
