diff options
| author | Hans Wippel <hwippel@linux.ibm.com> | 2018-06-28 20:05:10 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-06-30 14:42:26 +0300 |
| commit | be244f28d22f77d939ba2b973c102ad2b49d3496 (patch) | |
| tree | c819462ffbf01974dcc81d7069050cb3a384efd0 /net/smc/smc_core.c | |
| parent | c758dfddc1b5b1c9b8c64e5e4bb9bf24b74f4a59 (diff) | |
| download | linux-be244f28d22f77d939ba2b973c102ad2b49d3496.tar.xz | |
net/smc: add SMC-D support in data transfer
The data transfer and CDC message headers differ in SMC-R and SMC-D.
This patch adds support for the SMC-D data transfer to the existing SMC
code. It consists of the following:
* SMC-D CDC support
* SMC-D tx support
* SMC-D rx support
The CDC header is stored at the beginning of the receive buffer. Thus, a
rx_offset variable is added for the CDC header offset within the buffer
(0 for SMC-R).
Signed-off-by: Hans Wippel <hwippel@linux.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Suggested-by: Thomas Richter <tmricht@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/smc/smc_core.c')
| -rw-r--r-- | net/smc/smc_core.c | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c index daa88db1841a..434c028162a4 100644 --- a/net/smc/smc_core.c +++ b/net/smc/smc_core.c @@ -281,10 +281,12 @@ void smc_conn_free(struct smc_connection *conn) { if (!conn->lgr) return; - if (conn->lgr->is_smcd) + if (conn->lgr->is_smcd) { smc_ism_unset_conn(conn); - else + tasklet_kill(&conn->rx_tsklet); + } else { smc_cdc_tx_dismiss_slots(conn); + } smc_lgr_unregister_conn(conn); smc_buf_unuse(conn); } @@ -324,10 +326,13 @@ static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb, static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb, struct smc_buf_desc *buf_desc) { - if (is_dmb) + if (is_dmb) { + /* restore original buf len */ + buf_desc->len += sizeof(struct smcd_cdc_msg); smc_ism_unregister_dmb(lgr->smcd, buf_desc); - else + } else { kfree(buf_desc->cpu_addr); + } kfree(buf_desc); } @@ -632,6 +637,10 @@ create: conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE; conn->local_tx_ctrl.len = SMC_WR_TX_SIZE; conn->urg_state = SMC_URG_READ; + if (is_smcd) { + conn->rx_off = sizeof(struct smcd_cdc_msg); + smcd_cdc_rx_init(conn); /* init tasklet for this conn */ + } #ifndef KERNEL_HAS_ATOMIC64 spin_lock_init(&conn->acurs_lock); #endif @@ -776,8 +785,9 @@ static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr, kfree(buf_desc); return ERR_PTR(-EAGAIN); } - memset(buf_desc->cpu_addr, 0, bufsize); - buf_desc->len = bufsize; + buf_desc->pages = virt_to_page(buf_desc->cpu_addr); + /* CDC header stored in buf. So, pretend it was smaller */ + buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg); } else { buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY | @@ -854,7 +864,8 @@ static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb) conn->rmbe_size_short = bufsize_short; smc->sk.sk_rcvbuf = bufsize * 2; atomic_set(&conn->bytes_to_rcv, 0); - conn->rmbe_update_limit = smc_rmb_wnd_update_limit(bufsize); + conn->rmbe_update_limit = + smc_rmb_wnd_update_limit(buf_desc->len); if (is_smcd) smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */ } else { |