lkml.org 
[lkml]   [2022]   [Oct]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 5.10 223/390] RDMA/siw: Always consume all skbuf data in sk_data_ready() upcall.
    Date
    From: Bernard Metzler <bmt@zurich.ibm.com>

    [ Upstream commit 754209850df8367c954ac1de7671c7430b1f342c ]

    For header and trailer/padding processing, siw did not consume new
    skb data until minimum amount present to fill current header or trailer
    structure, including potential payload padding. Not consuming any
    data during upcall may cause a receive stall, since tcp_read_sock()
    is not upcalling again if no new data arrive.
    A NFSoRDMA client got stuck at RDMA Write reception of unaligned
    payload, if the current skb did contain only the expected 3 padding
    bytes, but not the 4 bytes CRC trailer. Expecting 4 more bytes already
    arrived in another skb, and not consuming those 3 bytes in the current
    upcall left the Write incomplete, waiting for the CRC forever.

    Fixes: 8b6a361b8c48 ("rdma/siw: receive path")
    Reported-by: Olga Kornievskaia <kolga@netapp.com>
    Tested-by: Olga Kornievskaia <kolga@netapp.com>
    Signed-off-by: Bernard Metzler <bmt@zurich.ibm.com>
    Link: https://lore.kernel.org/r/20220920081202.223629-1-bmt@zurich.ibm.com
    Signed-off-by: Leon Romanovsky <leon@kernel.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/infiniband/sw/siw/siw_qp_rx.c | 27 +++++++++++++++------------
    1 file changed, 15 insertions(+), 12 deletions(-)

    diff --git a/drivers/infiniband/sw/siw/siw_qp_rx.c b/drivers/infiniband/sw/siw/siw_qp_rx.c
    index 875ea6f1b04a..fd721cc19682 100644
    --- a/drivers/infiniband/sw/siw/siw_qp_rx.c
    +++ b/drivers/infiniband/sw/siw/siw_qp_rx.c
    @@ -961,27 +961,28 @@ int siw_proc_terminate(struct siw_qp *qp)
    static int siw_get_trailer(struct siw_qp *qp, struct siw_rx_stream *srx)
    {
    struct sk_buff *skb = srx->skb;
    + int avail = min(srx->skb_new, srx->fpdu_part_rem);
    u8 *tbuf = (u8 *)&srx->trailer.crc - srx->pad;
    __wsum crc_in, crc_own = 0;

    siw_dbg_qp(qp, "expected %d, available %d, pad %u\n",
    srx->fpdu_part_rem, srx->skb_new, srx->pad);

    - if (srx->skb_new < srx->fpdu_part_rem)
    - return -EAGAIN;
    -
    - skb_copy_bits(skb, srx->skb_offset, tbuf, srx->fpdu_part_rem);
    + skb_copy_bits(skb, srx->skb_offset, tbuf, avail);

    - if (srx->mpa_crc_hd && srx->pad)
    - crypto_shash_update(srx->mpa_crc_hd, tbuf, srx->pad);
    + srx->skb_new -= avail;
    + srx->skb_offset += avail;
    + srx->skb_copied += avail;
    + srx->fpdu_part_rem -= avail;

    - srx->skb_new -= srx->fpdu_part_rem;
    - srx->skb_offset += srx->fpdu_part_rem;
    - srx->skb_copied += srx->fpdu_part_rem;
    + if (srx->fpdu_part_rem)
    + return -EAGAIN;

    if (!srx->mpa_crc_hd)
    return 0;

    + if (srx->pad)
    + crypto_shash_update(srx->mpa_crc_hd, tbuf, srx->pad);
    /*
    * CRC32 is computed, transmitted and received directly in NBO,
    * so there's never a reason to convert byte order.
    @@ -1083,10 +1084,9 @@ static int siw_get_hdr(struct siw_rx_stream *srx)
    * completely received.
    */
    if (iwarp_pktinfo[opcode].hdr_len > sizeof(struct iwarp_ctrl_tagged)) {
    - bytes = iwarp_pktinfo[opcode].hdr_len - MIN_DDP_HDR;
    + int hdrlen = iwarp_pktinfo[opcode].hdr_len;

    - if (srx->skb_new < bytes)
    - return -EAGAIN;
    + bytes = min_t(int, hdrlen - MIN_DDP_HDR, srx->skb_new);

    skb_copy_bits(skb, srx->skb_offset,
    (char *)c_hdr + srx->fpdu_part_rcvd, bytes);
    @@ -1096,6 +1096,9 @@ static int siw_get_hdr(struct siw_rx_stream *srx)
    srx->skb_new -= bytes;
    srx->skb_offset += bytes;
    srx->skb_copied += bytes;
    +
    + if (srx->fpdu_part_rcvd < hdrlen)
    + return -EAGAIN;
    }

    /*
    --
    2.35.1


    \
     
     \ /
      Last update: 2022-10-24 16:17    [W:2.364 / U:2.140 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site