diff options
| author | Guangguan Wang <guangguan.wang@linux.alibaba.com> | 2022-07-14 17:44:00 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-07-18 11:19:16 +0100 |
| commit | 6d52e2de6415b7a035b3e8dc4ccffd0da25bbfb9 (patch) | |
| tree | 47e3ea2efd01ba5c2e9b3c81da9da5a17d86e493 /net/smc/smc_rx.c | |
| parent | 2acd1022549e210edc4cfc9fc65b07b88751f0d9 (diff) | |
net/smc: remove redundant dma sync ops
smc_ib_sync_sg_for_cpu/device are the ops used for dma memory cache
consistency. Smc sndbufs are dma buffers, where CPU writes data to
it and PCIE device reads data from it. So for sndbufs,
smc_ib_sync_sg_for_device is needed and smc_ib_sync_sg_for_cpu is
redundant as PCIE device will not write the buffers. Smc rmbs
are dma buffers, where PCIE device write data to it and CPU read
data from it. So for rmbs, smc_ib_sync_sg_for_cpu is needed and
smc_ib_sync_sg_for_device is redundant as CPU will not write the buffers.
Signed-off-by: Guangguan Wang <guangguan.wang@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/smc/smc_rx.c')
| -rw-r--r-- | net/smc/smc_rx.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/net/smc/smc_rx.c b/net/smc/smc_rx.c index 338b9ef806e8..00ad004835e6 100644 --- a/net/smc/smc_rx.c +++ b/net/smc/smc_rx.c @@ -413,7 +413,6 @@ copy: if (rc < 0) { if (!read_done) read_done = -EFAULT; - smc_rmb_sync_sg_for_device(conn); goto out; } } @@ -427,7 +426,6 @@ copy: chunk_len_sum += chunk_len; chunk_off = 0; /* modulo offset in recv ring buffer */ } - smc_rmb_sync_sg_for_device(conn); /* update cursors */ if (!(flags & MSG_PEEK)) { |