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| author | Sagi Grimberg <sagig@mellanox.com> | 2014-10-01 14:02:12 +0300 |
|---|---|---|
| committer | Roland Dreier <roland@purestorage.com> | 2014-10-09 00:06:07 -0700 |
| commit | 6df5a128f0fde6315a44e80b30412997147f5efd (patch) | |
| tree | b26b887f909b95f22ff9360d1180ef8321774783 /drivers/infiniband/ulp/iser/iser_initiator.c | |
| parent | 6e6fe2fb1d61b4baef1cf350049c6877583681ee (diff) | |
| download | linux-6df5a128f0fde6315a44e80b30412997147f5efd.tar.gz linux-6df5a128f0fde6315a44e80b30412997147f5efd.tar.bz2 linux-6df5a128f0fde6315a44e80b30412997147f5efd.zip | |
IB/iser: Suppress scsi command send completions
Singal completion of every 32 scsi commands and suppress all the rest.
We don't do anything upon getting the completion so no need to "just
consume" it. Cleanup of scsi command is done in cleanup_task callback.
Still keep dataout and control send completions as we may need to
cleanup there. This helps reducing the amount of interrupts/completions
in the IO path.
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband/ulp/iser/iser_initiator.c')
| -rw-r--r-- | drivers/infiniband/ulp/iser/iser_initiator.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/infiniband/ulp/iser/iser_initiator.c b/drivers/infiniband/ulp/iser/iser_initiator.c index ffbdf922587a..5a489ea63732 100644 --- a/drivers/infiniband/ulp/iser/iser_initiator.c +++ b/drivers/infiniband/ulp/iser/iser_initiator.c @@ -369,6 +369,11 @@ static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req) return 0; } +static inline bool iser_signal_comp(int sig_count) +{ + return ((sig_count % ISER_SIGNAL_CMD_COUNT) == 0); +} + /** * iser_send_command - send command PDU */ @@ -383,6 +388,7 @@ int iser_send_command(struct iscsi_conn *conn, struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr; struct scsi_cmnd *sc = task->sc; struct iser_tx_desc *tx_desc = &iser_task->desc; + static unsigned sig_count; edtl = ntohl(hdr->data_length); @@ -428,7 +434,8 @@ int iser_send_command(struct iscsi_conn *conn, iser_task->status = ISER_TASK_STATUS_STARTED; - err = iser_post_send(&iser_conn->ib_conn, tx_desc); + err = iser_post_send(&iser_conn->ib_conn, tx_desc, + iser_signal_comp(++sig_count)); if (!err) return 0; @@ -493,7 +500,7 @@ int iser_send_data_out(struct iscsi_conn *conn, itt, buf_offset, data_seg_len); - err = iser_post_send(&iser_conn->ib_conn, tx_desc); + err = iser_post_send(&iser_conn->ib_conn, tx_desc, true); if (!err) return 0; @@ -555,7 +562,7 @@ int iser_send_control(struct iscsi_conn *conn, goto send_control_error; } - err = iser_post_send(&iser_conn->ib_conn, mdesc); + err = iser_post_send(&iser_conn->ib_conn, mdesc, true); if (!err) return 0; |