From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steve Wise Subject: Re: [PATCH v1 iproute2-next 1/4] rdma: add helper rd_sendrecv_msg() Date: Tue, 26 Feb 2019 13:55:30 -0600 Message-ID: <4efd2295-5ab1-7e41-a8a1-d21b3043bff8@opengridcomputing.com> References: <20190223092615.GM23561@mtr-leonro.mtl.com> <20190223093122.GO23561@mtr-leonro.mtl.com> <7f48fc85-45ab-fe7d-9614-4c5eb50f8401@opengridcomputing.com> <20190226191637.GW11231@mtr-leonro.mtl.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <20190226191637.GW11231@mtr-leonro.mtl.com> Content-Language: en-US Sender: netdev-owner@vger.kernel.org To: Leon Romanovsky Cc: dsahern@gmail.com, stephen@networkplumber.org, netdev@vger.kernel.org, linux-rdma@vger.kernel.org List-Id: linux-rdma@vger.kernel.org On 2/26/2019 1:16 PM, Leon Romanovsky wrote: > On Tue, Feb 26, 2019 at 11:19:12AM -0600, Steve Wise wrote: >> On 2/23/2019 3:31 AM, Leon Romanovsky wrote: >>> On Sat, Feb 23, 2019 at 11:26:15AM +0200, Leon Romanovsky wrote: >>>> On Thu, Feb 21, 2019 at 08:19:03AM -0800, Steve Wise wrote: >>>>> This function sends the constructed netlink message and then >>>>> receives the response, displaying any error text. >>>>> >>>>> Change 'rdma dev set' to use it. >>>>> >>>>> Signed-off-by: Steve Wise >>>>> --- >>>>> rdma/dev.c | 2 +- >>>>> rdma/rdma.h | 1 + >>>>> rdma/utils.c | 21 +++++++++++++++++++++ >>>>> 3 files changed, 23 insertions(+), 1 deletion(-) >>>>> >>>>> diff --git a/rdma/dev.c b/rdma/dev.c >>>>> index 60ff4b31e320..d2949c378f08 100644 >>>>> --- a/rdma/dev.c >>>>> +++ b/rdma/dev.c >>>>> @@ -273,7 +273,7 @@ static int dev_set_name(struct rd *rd) >>>>> mnl_attr_put_u32(rd->nlh, RDMA_NLDEV_ATTR_DEV_INDEX, rd->dev_idx); >>>>> mnl_attr_put_strz(rd->nlh, RDMA_NLDEV_ATTR_DEV_NAME, rd_argv(rd)); >>>>> >>>>> - return rd_send_msg(rd); >>>>> + return rd_sendrecv_msg(rd, seq); >>>>> } >>>>> >>>>> static int dev_one_set(struct rd *rd) >>>>> diff --git a/rdma/rdma.h b/rdma/rdma.h >>>>> index 547bb5749a39..20be2f12c4f8 100644 >>>>> --- a/rdma/rdma.h >>>>> +++ b/rdma/rdma.h >>>>> @@ -115,6 +115,7 @@ bool rd_check_is_key_exist(struct rd *rd, const char *key); >>>>> */ >>>>> int rd_send_msg(struct rd *rd); >>>>> int rd_recv_msg(struct rd *rd, mnl_cb_t callback, void *data, uint32_t seq); >>>>> +int rd_sendrecv_msg(struct rd *rd, unsigned int seq); >>>>> void rd_prepare_msg(struct rd *rd, uint32_t cmd, uint32_t *seq, uint16_t flags); >>>>> int rd_dev_init_cb(const struct nlmsghdr *nlh, void *data); >>>>> int rd_attr_cb(const struct nlattr *attr, void *data); >>>>> diff --git a/rdma/utils.c b/rdma/utils.c >>>>> index 069d44fece10..a6f2826c9605 100644 >>>>> --- a/rdma/utils.c >>>>> +++ b/rdma/utils.c >>>>> @@ -664,6 +664,27 @@ int rd_recv_msg(struct rd *rd, mnl_cb_t callback, void *data, unsigned int seq) >>>>> return ret; >>>>> } >>>>> >>>>> +static int null_cb(const struct nlmsghdr *nlh, void *data) >>>>> +{ >>>>> + return MNL_CB_OK; >>>>> +} >>>>> + >>>>> +int rd_sendrecv_msg(struct rd *rd, unsigned int seq) >>>>> +{ >>>>> + int ret; >>>>> + >>>>> + ret = rd_send_msg(rd); >>>>> + if (ret) { >>>>> + perror(NULL); >>>> This is more or less already done in rd_send_msg() and that function >>>> prints something in case of execution error. So the missing piece >>>> is to update rd_recv_msg(), so all places will "magically" print errors >>>> and not only dev_set_name(). >>>> >>>>> + goto out; >>>>> + } >>>>> + ret = rd_recv_msg(rd, null_cb, rd, seq); >>> Will this "null_cb" work for all send/recv flows or only in flows where >>> response can be error only? >> >> Only those flows where no nl attributes are expected to be returned. >> >> >>> Will we need this recv_msg if we implement >>> extack support? >> >> I'm not sure how extack works.  Do you know? > I can't say that :) We can change things if/when we support extack. Stevo.