The branch stable/13 has been updated by hselasky: URL: https://cgit.FreeBSD.org/src/commit/?id=7b3bc182d0e636f3a674657c0563678582bc47bb
commit 7b3bc182d0e636f3a674657c0563678582bc47bb Author: Hans Petter Selasky <[email protected]> AuthorDate: 2022-02-24 09:59:07 +0000 Commit: Hans Petter Selasky <[email protected]> CommitDate: 2022-02-24 09:59:07 +0000 mlx5en: Improve RX- and TX- TLS refcounting. Use the send tag refcounting mechanism to refcount the RX- and TX- TLS send tags. Then it is no longer needed to wait for refcounts to reach zero when destroying RX- and TX- TLS send tags as a result of pending data or WQE commands. This also ensures that when TX-TLS and rate limiting is used at the same time, the underlying SQ is not prematurely destroyed. Sponsored by: NVIDIA Networking (cherry picked from commit ebdb70064900a2ba2e3f8341328edc34e619170d) --- sys/dev/mlx5/mlx5_en/en.h | 5 +++-- sys/dev/mlx5/mlx5_en/en_hw_tls.h | 2 +- sys/dev/mlx5/mlx5_en/mlx5_en_hw_tls.c | 23 ++++++++++------------- sys/dev/mlx5/mlx5_en/mlx5_en_main.c | 9 +++++---- sys/dev/mlx5/mlx5_en/mlx5_en_tx.c | 26 +++++++++++++++----------- 5 files changed, 34 insertions(+), 31 deletions(-) diff --git a/sys/dev/mlx5/mlx5_en/en.h b/sys/dev/mlx5/mlx5_en/en.h index 28928aa18fa1..424d7f66b056 100644 --- a/sys/dev/mlx5/mlx5_en/en.h +++ b/sys/dev/mlx5/mlx5_en/en.h @@ -1,5 +1,6 @@ /*- * Copyright (c) 2015-2021 Mellanox Technologies. All rights reserved. + * Copyright (c) 2022 NVIDIA corporation & affiliates. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -829,7 +830,7 @@ struct mlx5e_iq { struct mlx5e_sq_mbuf { bus_dmamap_t dma_map; struct mbuf *mbuf; - volatile s32 *p_refcount; /* in use refcount, if any */ + struct m_snd_tag *mst; /* if set, unref this send tag on completion */ u32 num_bytes; u32 num_wqebbs; }; @@ -1043,7 +1044,7 @@ struct mlx5e_flow_tables { }; struct mlx5e_xmit_args { - volatile s32 *pref; + struct m_snd_tag *mst; u32 tisn; u16 ihs; }; diff --git a/sys/dev/mlx5/mlx5_en/en_hw_tls.h b/sys/dev/mlx5/mlx5_en/en_hw_tls.h index 563c5304dd30..7ba00fc1f363 100644 --- a/sys/dev/mlx5/mlx5_en/en_hw_tls.h +++ b/sys/dev/mlx5/mlx5_en/en_hw_tls.h @@ -1,5 +1,6 @@ /*- * Copyright (c) 2019 Mellanox Technologies. All rights reserved. + * Copyright (c) 2022 NVIDIA corporation & affiliates. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -44,7 +45,6 @@ enum { struct mlx5e_tls; struct mlx5e_tls_tag { struct m_snd_tag tag; - volatile s32 refs; /* number of pending mbufs */ uint32_t tisn; /* HW TIS context number */ uint32_t dek_index; /* HW TLS context number */ struct mlx5e_tls *tls; diff --git a/sys/dev/mlx5/mlx5_en/mlx5_en_hw_tls.c b/sys/dev/mlx5/mlx5_en/mlx5_en_hw_tls.c index 57d77cc897db..e28fddcfd116 100644 --- a/sys/dev/mlx5/mlx5_en/mlx5_en_hw_tls.c +++ b/sys/dev/mlx5/mlx5_en/mlx5_en_hw_tls.c @@ -1,5 +1,6 @@ /*- - * Copyright (c) 2019 Mellanox Technologies. All rights reserved. + * Copyright (c) 2019-2021 Mellanox Technologies. All rights reserved. + * Copyright (c) 2022 NVIDIA corporation & affiliates. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -225,10 +226,6 @@ mlx5e_tls_work(struct work_struct *work) break; case MLX5E_TLS_ST_FREED: - /* wait for all refs to go away */ - while (ptag->refs != 0) - msleep(1); - /* try to destroy DEK context by ID */ if (ptag->dek_index_ok) err = mlx5_encryption_key_destroy(priv->mdev, ptag->dek_index); @@ -519,8 +516,8 @@ mlx5e_tls_send_static_parameters(struct mlx5e_sq *sq, struct mlx5e_tls_tag *ptag sq->mbuf[pi].mbuf = NULL; sq->mbuf[pi].num_bytes = 0; sq->mbuf[pi].num_wqebbs = DIV_ROUND_UP(ds_cnt, MLX5_SEND_WQEBB_NUM_DS); - sq->mbuf[pi].p_refcount = &ptag->refs; - atomic_add_int(&ptag->refs, 1); + sq->mbuf[pi].mst = m_snd_tag_ref(&ptag->tag); + sq->pc += sq->mbuf[pi].num_wqebbs; } @@ -557,8 +554,8 @@ mlx5e_tls_send_progress_parameters(struct mlx5e_sq *sq, struct mlx5e_tls_tag *pt sq->mbuf[pi].mbuf = NULL; sq->mbuf[pi].num_bytes = 0; sq->mbuf[pi].num_wqebbs = DIV_ROUND_UP(ds_cnt, MLX5_SEND_WQEBB_NUM_DS); - sq->mbuf[pi].p_refcount = &ptag->refs; - atomic_add_int(&ptag->refs, 1); + sq->mbuf[pi].mst = m_snd_tag_ref(&ptag->tag); + sq->pc += sq->mbuf[pi].num_wqebbs; } @@ -587,8 +584,8 @@ mlx5e_tls_send_nop(struct mlx5e_sq *sq, struct mlx5e_tls_tag *ptag) sq->mbuf[pi].mbuf = NULL; sq->mbuf[pi].num_bytes = 0; sq->mbuf[pi].num_wqebbs = DIV_ROUND_UP(ds_cnt, MLX5_SEND_WQEBB_NUM_DS); - sq->mbuf[pi].p_refcount = &ptag->refs; - atomic_add_int(&ptag->refs, 1); + sq->mbuf[pi].mst = m_snd_tag_ref(&ptag->tag); + sq->pc += sq->mbuf[pi].num_wqebbs; } @@ -768,7 +765,7 @@ mlx5e_sq_tls_xmit(struct mlx5e_sq *sq, struct mlx5e_xmit_args *parg, struct mbuf /* setup transmit arguments */ parg->tisn = ptls_tag->tisn; - parg->pref = &ptls_tag->refs; + parg->mst = &ptls_tag->tag; /* try to send DUMP data */ if (mlx5e_sq_dump_xmit(sq, parg, &r_mb) != 0) { @@ -787,7 +784,7 @@ mlx5e_sq_tls_xmit(struct mlx5e_sq *sq, struct mlx5e_xmit_args *parg, struct mbuf parg->tisn = ptls_tag->tisn; parg->ihs = header_size; - parg->pref = &ptls_tag->refs; + parg->mst = &ptls_tag->tag; return (MLX5E_TLS_CONTINUE); } diff --git a/sys/dev/mlx5/mlx5_en/mlx5_en_main.c b/sys/dev/mlx5/mlx5_en/mlx5_en_main.c index 0cff33543cb1..1bbd7f75b1db 100644 --- a/sys/dev/mlx5/mlx5_en/mlx5_en_main.c +++ b/sys/dev/mlx5/mlx5_en/mlx5_en_main.c @@ -1,5 +1,6 @@ /*- * Copyright (c) 2015-2021 Mellanox Technologies. All rights reserved. + * Copyright (c) 2022 NVIDIA corporation & affiliates. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -1568,14 +1569,14 @@ mlx5e_free_sq_db(struct mlx5e_sq *sq) int x; for (x = 0; x != wq_sz; x++) { - if (unlikely(sq->mbuf[x].p_refcount != NULL)) { - atomic_add_int(sq->mbuf[x].p_refcount, -1); - sq->mbuf[x].p_refcount = NULL; - } if (sq->mbuf[x].mbuf != NULL) { bus_dmamap_unload(sq->dma_tag, sq->mbuf[x].dma_map); m_freem(sq->mbuf[x].mbuf); } + if (sq->mbuf[x].mst != NULL) { + m_snd_tag_rele(sq->mbuf[x].mst); + sq->mbuf[x].mst = NULL; + } bus_dmamap_destroy(sq->dma_tag, sq->mbuf[x].dma_map); } free(sq->mbuf, M_MLX5EN); diff --git a/sys/dev/mlx5/mlx5_en/mlx5_en_tx.c b/sys/dev/mlx5/mlx5_en/mlx5_en_tx.c index 4cc25e1d5b51..088b55d81dfe 100644 --- a/sys/dev/mlx5/mlx5_en/mlx5_en_tx.c +++ b/sys/dev/mlx5/mlx5_en/mlx5_en_tx.c @@ -1,5 +1,6 @@ /*- * Copyright (c) 2015-2021 Mellanox Technologies. All rights reserved. + * Copyright (c) 2022 NVIDIA corporation & affiliates. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -665,8 +666,7 @@ mlx5e_sq_dump_xmit(struct mlx5e_sq *sq, struct mlx5e_xmit_args *parg, struct mbu /* store pointer to mbuf */ sq->mbuf[pi].mbuf = mb; - sq->mbuf[pi].p_refcount = parg->pref; - atomic_add_int(parg->pref, 1); + sq->mbuf[pi].mst = m_snd_tag_ref(parg->mst); /* count all traffic going out */ sq->stats.packets++; @@ -996,9 +996,11 @@ top: /* Store pointer to mbuf */ sq->mbuf[pi].mbuf = mb; sq->mbuf[pi].num_wqebbs = DIV_ROUND_UP(ds_cnt, MLX5_SEND_WQEBB_NUM_DS); - sq->mbuf[pi].p_refcount = args.pref; - if (unlikely(args.pref != NULL)) - atomic_add_int(args.pref, 1); + if (unlikely(args.mst != NULL)) + sq->mbuf[pi].mst = m_snd_tag_ref(args.mst); + else + MPASS(sq->mbuf[pi].mst == NULL); + sq->pc += sq->mbuf[pi].num_wqebbs; /* Count all traffic going out */ @@ -1028,6 +1030,7 @@ mlx5e_poll_tx_cq(struct mlx5e_sq *sq, int budget) while (budget > 0) { struct mlx5_cqe64 *cqe; + struct m_snd_tag *mst; struct mbuf *mb; bool match; u16 sqcc_this; @@ -1067,13 +1070,10 @@ mlx5e_poll_tx_cq(struct mlx5e_sq *sq, int budget) match = (delta < sq->mbuf[ci].num_wqebbs); mb = sq->mbuf[ci].mbuf; sq->mbuf[ci].mbuf = NULL; + mst = sq->mbuf[ci].mst; + sq->mbuf[ci].mst = NULL; - if (unlikely(sq->mbuf[ci].p_refcount != NULL)) { - atomic_add_int(sq->mbuf[ci].p_refcount, -1); - sq->mbuf[ci].p_refcount = NULL; - } - - if (mb == NULL) { + if (unlikely(mb == NULL)) { if (unlikely(sq->mbuf[ci].num_bytes == 0)) sq->stats.nop++; } else { @@ -1084,6 +1084,10 @@ mlx5e_poll_tx_cq(struct mlx5e_sq *sq, int budget) /* Free transmitted mbuf */ m_freem(mb); } + + if (unlikely(mst != NULL)) + m_snd_tag_rele(mst); + sqcc += sq->mbuf[ci].num_wqebbs; } }
