From a6920d1d130c3de039be982eba42542d329dc64c Mon Sep 17 00:00:00 2001 From: Karsten Graul Date: Thu, 3 May 2018 17:57:38 +0200 Subject: [PATCH] net/smc: handle unregistered buffers When smc_wr_reg_send() fails then tag (regerr) the affected buffer and free it in smc_buf_unuse(). Signed-off-by: Karsten Graul Signed-off-by: Ursula Braun Signed-off-by: David S. Miller --- net/smc/af_smc.c | 4 +++- net/smc/smc_core.c | 22 +++++++++++++++++++--- net/smc/smc_core.h | 3 ++- 3 files changed, 24 insertions(+), 5 deletions(-) diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index fdb2976..d03b8d2 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -296,8 +296,10 @@ static void smc_copy_sock_settings_to_smc(struct smc_sock *smc) static int smc_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc) { /* register memory region for new rmb */ - if (smc_wr_reg_send(link, rmb_desc->mr_rx[SMC_SINGLE_LINK])) + if (smc_wr_reg_send(link, rmb_desc->mr_rx[SMC_SINGLE_LINK])) { + rmb_desc->regerr = 1; return -EFAULT; + } return 0; } diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c index f44f680..d4bd01b 100644 --- a/net/smc/smc_core.c +++ b/net/smc/smc_core.c @@ -32,6 +32,9 @@ static u32 smc_lgr_num; /* unique link group number */ +static void smc_buf_free(struct smc_buf_desc *buf_desc, struct smc_link *lnk, + bool is_rmb); + static void smc_lgr_schedule_free_work(struct smc_link_group *lgr) { /* client link group creation always follows the server link group @@ -234,9 +237,22 @@ static void smc_buf_unuse(struct smc_connection *conn) conn->sndbuf_size = 0; } if (conn->rmb_desc) { - conn->rmb_desc->reused = true; - conn->rmb_desc->used = 0; - conn->rmbe_size = 0; + if (!conn->rmb_desc->regerr) { + conn->rmb_desc->reused = 1; + conn->rmb_desc->used = 0; + conn->rmbe_size = 0; + } else { + /* buf registration failed, reuse not possible */ + struct smc_link_group *lgr = conn->lgr; + struct smc_link *lnk; + + write_lock_bh(&lgr->rmbs_lock); + list_del(&conn->rmb_desc->list); + write_unlock_bh(&lgr->rmbs_lock); + + lnk = &lgr->lnk[SMC_SINGLE_LINK]; + smc_buf_free(conn->rmb_desc, lnk, true); + } } } diff --git a/net/smc/smc_core.h b/net/smc/smc_core.h index 07e2a39..5dfcb15 100644 --- a/net/smc/smc_core.h +++ b/net/smc/smc_core.h @@ -123,7 +123,8 @@ struct smc_buf_desc { */ u32 order; /* allocation order */ u32 used; /* currently used / unused */ - bool reused; /* new created / reused */ + u8 reused : 1; /* new created / reused */ + u8 regerr : 1; /* err during registration */ }; struct smc_rtoken { /* address/key of remote RMB */ -- 2.7.4