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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: Mellanox.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7c6251c7-9c39-485c-7fcc-08d7520c5f75 X-MS-Exchange-CrossTenant-originalarrivaltime: 16 Oct 2019 07:42:19.0186 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a652971c-7d2e-4d9b-a6a4-d149256f461b X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: xfcOVZO/iv2U8wzDa6BrvMT0m6hnb8Ir2O2dxK5pXADXrd8NXx2VkFV4DSRImJKzgdMi21Ed+VSXb9sObmJ3Is8/L0gbN91cYTWbhSFplMc= X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM4PR05MB3284 Subject: Re: [dpdk-dev] [PATCH v2] net/mlx5: retry when link update fails X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" > -----Original Message----- > From: Moti Haimovsky > Sent: Wednesday, October 16, 2019 10:34 > To: Slava Ovsiienko ; Raslan Darawsheh > > Cc: dev@dpdk.org > Subject: [PATCH v2] net/mlx5: retry when link update fails >=20 > mlx5_link_update immediately returns when called with no-wait parameter > and its call for retrieving the link status returns with EAGAIN error. > This is too harsh on busy systems where a first call fails with EAGAIN fr= om > time to time. > This patch adds a (very limited) retry on such cases in order to allow > retrieving the link status. >=20 > Signed-off-by: Moti Haimovsky Acked-by: Viacheslav Ovsiienko > --- > V2: > * Code rebase > --- > drivers/net/mlx5/mlx5_defs.h | 3 +++ > drivers/net/mlx5/mlx5_ethdev.c | 5 +++-- > 2 files changed, 6 insertions(+), 2 deletions(-) >=20 > diff --git a/drivers/net/mlx5/mlx5_defs.h b/drivers/net/mlx5/mlx5_defs.h > index 180122d..248ef3c 100644 > --- a/drivers/net/mlx5/mlx5_defs.h > +++ b/drivers/net/mlx5/mlx5_defs.h > @@ -105,6 +105,9 @@ > /* Timeout in seconds to get a valid link status. */ #define > MLX5_LINK_STATUS_TIMEOUT 10 >=20 > +/* Number of times to retry retrieving the physical link information. > +*/ #define MLX5_GET_LINK_STATUS_RETRY_COUNT 3 > + > /* Maximum number of UAR pages used by a port, > * These are the size and mask for an array of mutexes used to synchroni= ze > * the access to port's UARs on platforms that do not support 64 bit wri= tes. > diff --git a/drivers/net/mlx5/mlx5_ethdev.c > b/drivers/net/mlx5/mlx5_ethdev.c index f2b1752..5f05b2b 100644 > --- a/drivers/net/mlx5/mlx5_ethdev.c > +++ b/drivers/net/mlx5/mlx5_ethdev.c > @@ -999,6 +999,7 @@ int mlx5_fw_version_get(struct rte_eth_dev *dev, > char *fw_ver, size_t fw_size) > int ret; > struct rte_eth_link dev_link; > time_t start_time =3D time(NULL); > + int retry =3D MLX5_GET_LINK_STATUS_RETRY_COUNT; >=20 > do { > ret =3D mlx5_link_update_unlocked_gs(dev, &dev_link); @@ - > 1007,7 +1008,7 @@ int mlx5_fw_version_get(struct rte_eth_dev *dev, char > *fw_ver, size_t fw_size) > if (ret =3D=3D 0) > break; > /* Handle wait to complete situation. */ > - if (wait_to_complete && ret =3D=3D -EAGAIN) { > + if ((wait_to_complete || retry) && ret =3D=3D -EAGAIN) { > if (abs((int)difftime(time(NULL), start_time)) < > MLX5_LINK_STATUS_TIMEOUT) { > usleep(0); > @@ -1019,7 +1020,7 @@ int mlx5_fw_version_get(struct rte_eth_dev *dev, > char *fw_ver, size_t fw_size) > } else if (ret < 0) { > return ret; > } > - } while (wait_to_complete); > + } while (wait_to_complete || retry-- > 0); > ret =3D !!memcmp(&dev->data->dev_link, &dev_link, > sizeof(struct rte_eth_link)); > dev->data->dev_link =3D dev_link; > -- > 1.8.3.1