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* [dpdk-dev] [PATCH 1/2] bus/pci: harmonize and document rte_pci_read_config return value
@ 2018-08-14 14:30 Luca Boccassi
  2018-08-14 14:30 ` [dpdk-dev] [PATCH 2/2] virtio: fix PCI config err handling Luca Boccassi
  2018-08-16 18:47 ` [dpdk-dev] [PATCH 1/2] bus/pci: harmonize and document rte_pci_read_config return value Luca Boccassi
  0 siblings, 2 replies; 34+ messages in thread
From: Luca Boccassi @ 2018-08-14 14:30 UTC (permalink / raw)
  To: dev
  Cc: maxime.coquelin, zhihong.wang, tiwei.bie, bruce.richardson,
	Luca Boccassi

On Linux, rte_pci_read_config on success returns the number of read
bytes, but on BSD it returns 0.
Document the return values, and have BSD behave as Linux does.

At least one case (bnx2x PMD) treats 0 as an error, so the change
makes sense also for that.

Signed-off-by: Luca Boccassi <bluca@debian.org>
---
 drivers/bus/pci/bsd/pci.c     | 4 +++-
 drivers/bus/pci/rte_bus_pci.h | 2 ++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/bus/pci/bsd/pci.c b/drivers/bus/pci/bsd/pci.c
index 655b34b7e4..175d83cf1b 100644
--- a/drivers/bus/pci/bsd/pci.c
+++ b/drivers/bus/pci/bsd/pci.c
@@ -439,6 +439,8 @@ int rte_pci_read_config(const struct rte_pci_device *dev,
 {
 	int fd = -1;
 	int size;
+	/* Copy Linux implementation's behaviour */
+	const int return_len = len;
 	struct pci_io pi = {
 		.pi_sel = {
 			.pc_domain = dev->addr.domain,
@@ -469,7 +471,7 @@ int rte_pci_read_config(const struct rte_pci_device *dev,
 	}
 	close(fd);
 
-	return 0;
+	return return_len;
 
  error:
 	if (fd >= 0)
diff --git a/drivers/bus/pci/rte_bus_pci.h b/drivers/bus/pci/rte_bus_pci.h
index 0d1955ffe0..df8f64798d 100644
--- a/drivers/bus/pci/rte_bus_pci.h
+++ b/drivers/bus/pci/rte_bus_pci.h
@@ -219,6 +219,8 @@ void rte_pci_unregister(struct rte_pci_driver *driver);
  *   The length of the data buffer.
  * @param offset
  *   The offset into PCI config space
+ * @return
+ *  Number of bytes read on success, negative on error.
  */
 int rte_pci_read_config(const struct rte_pci_device *device,
 		void *buf, size_t len, off_t offset);
-- 
2.18.0

^ permalink raw reply	[flat|nested] 34+ messages in thread

end of thread, other threads:[~2018-10-28 23:55 UTC | newest]

Thread overview: 34+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-08-14 14:30 [dpdk-dev] [PATCH 1/2] bus/pci: harmonize and document rte_pci_read_config return value Luca Boccassi
2018-08-14 14:30 ` [dpdk-dev] [PATCH 2/2] virtio: fix PCI config err handling Luca Boccassi
2018-08-15  3:11   ` Tiwei Bie
2018-08-15  9:50     ` Luca Boccassi
2018-08-16  6:46       ` Tiwei Bie
2018-08-16 10:27         ` Luca Boccassi
2018-08-16 18:47 ` [dpdk-dev] [PATCH 1/2] bus/pci: harmonize and document rte_pci_read_config return value Luca Boccassi
2018-08-16 18:47   ` [dpdk-dev] [PATCH 2/2] virtio: fix PCI config err handling Luca Boccassi
2018-08-16 18:49     ` Luca Boccassi
2018-08-20  8:18       ` Tiwei Bie
2018-08-20 16:45         ` Luca Boccassi
2018-08-21  2:40           ` Tiwei Bie
2018-08-23 12:52             ` Luca Boccassi
2018-08-24  4:23               ` Tiwei Bie
2018-08-24 17:14                 ` Luca Boccassi
2018-08-20 16:44   ` [dpdk-dev] [PATCH v3 1/2] bus/pci: harmonize and document rte_pci_read_config return value Luca Boccassi
2018-08-20 16:44     ` [dpdk-dev] [PATCH v3 2/2] virtio: fix PCI config err handling Luca Boccassi
2018-08-24 17:14     ` [dpdk-dev] [PATCH v4 1/2] bus/pci: harmonize and document rte_pci_read_config return value Luca Boccassi
2018-08-24 17:14       ` [dpdk-dev] [PATCH v4 2/2] virtio: fix PCI config err handling Luca Boccassi
2018-08-27  5:29         ` Tiwei Bie
2018-08-27 16:52           ` Luca Boccassi
2018-08-28  6:47             ` Tiwei Bie
2018-08-27 16:52       ` [dpdk-dev] [PATCH v5 1/2] bus/pci: harmonize and document rte_pci_read_config return value Luca Boccassi
2018-08-27 16:52         ` [dpdk-dev] [PATCH v5 2/2] virtio: fix PCI config err handling Luca Boccassi
2018-08-28  6:43           ` Tiwei Bie
2018-08-28 10:14             ` Luca Boccassi
2018-08-28 10:12         ` [dpdk-dev] [PATCH v6 1/2] bus/pci: harmonize and document rte_pci_read_config return value Luca Boccassi
2018-08-28 10:12           ` [dpdk-dev] [PATCH v6 2/2] net/virtio: fix PCI config err handling Luca Boccassi
2018-10-11 10:27             ` Thomas Monjalon
2018-10-11 10:53               ` Luca Boccassi
2018-10-11 13:01                 ` Tiwei Bie
2018-10-28 23:55                   ` Thomas Monjalon
2018-10-17  9:58           ` [dpdk-dev] [PATCH v6 1/2] bus/pci: harmonize and document rte_pci_read_config return value Luca Boccassi
2018-10-17 10:57             ` Bruce Richardson

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