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    Subject[PATCH net-next v7 04/11] net/smc: implement DMB-related operations of loopback-ism
    Date
    This implements DMB (un)registration and data move operations of
    loopback-ism device.

    Signed-off-by: Wen Gu <guwen@linux.alibaba.com>
    Reviewed-by: Wenjia Zhang <wenjia@linux.ibm.com>
    Reviewed-and-tested-by: Jan Karcher <jaka@linux.ibm.com>
    ---
    net/smc/smc_loopback.c | 129 ++++++++++++++++++++++++++++++++++++++++-
    net/smc/smc_loopback.h | 13 +++++
    2 files changed, 139 insertions(+), 3 deletions(-)

    diff --git a/net/smc/smc_loopback.c b/net/smc/smc_loopback.c
    index 0349632a76c4..d75852549b00 100644
    --- a/net/smc/smc_loopback.c
    +++ b/net/smc/smc_loopback.c
    @@ -15,10 +15,12 @@
    #include <linux/types.h>
    #include <net/smc.h>

    +#include "smc_cdc.h"
    #include "smc_ism.h"
    #include "smc_loopback.h"

    #define SMC_LO_V2_CAPABLE 0x1 /* loopback-ism acts as ISMv2 */
    +#define SMC_DMA_ADDR_INVALID (~(dma_addr_t)0)

    static const char smc_lo_dev_name[] = "loopback-ism";
    static struct smc_lo_dev *lo_dev;
    @@ -48,6 +50,125 @@ static int smc_lo_query_rgid(struct smcd_dev *smcd, struct smcd_gid *rgid,
    return 0;
    }

    +static int smc_lo_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb,
    + void *client_priv)
    +{
    + struct smc_lo_dmb_node *dmb_node, *tmp_node;
    + struct smc_lo_dev *ldev = smcd->priv;
    + int sba_idx, rc;
    +
    + /* check space for new dmb */
    + for_each_clear_bit(sba_idx, ldev->sba_idx_mask, SMC_LO_MAX_DMBS) {
    + if (!test_and_set_bit(sba_idx, ldev->sba_idx_mask))
    + break;
    + }
    + if (sba_idx == SMC_LO_MAX_DMBS)
    + return -ENOSPC;
    +
    + dmb_node = kzalloc(sizeof(*dmb_node), GFP_KERNEL);
    + if (!dmb_node) {
    + rc = -ENOMEM;
    + goto err_bit;
    + }
    +
    + dmb_node->sba_idx = sba_idx;
    + dmb_node->len = dmb->dmb_len;
    + dmb_node->cpu_addr = kzalloc(dmb_node->len, GFP_KERNEL |
    + __GFP_NOWARN | __GFP_NORETRY |
    + __GFP_NOMEMALLOC);
    + if (!dmb_node->cpu_addr) {
    + rc = -ENOMEM;
    + goto err_node;
    + }
    + dmb_node->dma_addr = SMC_DMA_ADDR_INVALID;
    +
    +again:
    + /* add new dmb into hash table */
    + get_random_bytes(&dmb_node->token, sizeof(dmb_node->token));
    + write_lock_bh(&ldev->dmb_ht_lock);
    + hash_for_each_possible(ldev->dmb_ht, tmp_node, list, dmb_node->token) {
    + if (tmp_node->token == dmb_node->token) {
    + write_unlock_bh(&ldev->dmb_ht_lock);
    + goto again;
    + }
    + }
    + hash_add(ldev->dmb_ht, &dmb_node->list, dmb_node->token);
    + write_unlock_bh(&ldev->dmb_ht_lock);
    +
    + dmb->sba_idx = dmb_node->sba_idx;
    + dmb->dmb_tok = dmb_node->token;
    + dmb->cpu_addr = dmb_node->cpu_addr;
    + dmb->dma_addr = dmb_node->dma_addr;
    + dmb->dmb_len = dmb_node->len;
    +
    + return 0;
    +
    +err_node:
    + kfree(dmb_node);
    +err_bit:
    + clear_bit(sba_idx, ldev->sba_idx_mask);
    + return rc;
    +}
    +
    +static int smc_lo_unregister_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb)
    +{
    + struct smc_lo_dmb_node *dmb_node = NULL, *tmp_node;
    + struct smc_lo_dev *ldev = smcd->priv;
    +
    + /* remove dmb from hash table */
    + write_lock_bh(&ldev->dmb_ht_lock);
    + hash_for_each_possible(ldev->dmb_ht, tmp_node, list, dmb->dmb_tok) {
    + if (tmp_node->token == dmb->dmb_tok) {
    + dmb_node = tmp_node;
    + break;
    + }
    + }
    + if (!dmb_node) {
    + write_unlock_bh(&ldev->dmb_ht_lock);
    + return -EINVAL;
    + }
    + hash_del(&dmb_node->list);
    + write_unlock_bh(&ldev->dmb_ht_lock);
    +
    + clear_bit(dmb_node->sba_idx, ldev->sba_idx_mask);
    + kfree(dmb_node->cpu_addr);
    + kfree(dmb_node);
    +
    + return 0;
    +}
    +
    +static int smc_lo_move_data(struct smcd_dev *smcd, u64 dmb_tok,
    + unsigned int idx, bool sf, unsigned int offset,
    + void *data, unsigned int size)
    +{
    + struct smc_lo_dmb_node *rmb_node = NULL, *tmp_node;
    + struct smc_lo_dev *ldev = smcd->priv;
    + struct smc_connection *conn;
    +
    + read_lock_bh(&ldev->dmb_ht_lock);
    + hash_for_each_possible(ldev->dmb_ht, tmp_node, list, dmb_tok) {
    + if (tmp_node->token == dmb_tok) {
    + rmb_node = tmp_node;
    + break;
    + }
    + }
    + if (!rmb_node) {
    + read_unlock_bh(&ldev->dmb_ht_lock);
    + return -EINVAL;
    + }
    + memcpy((char *)rmb_node->cpu_addr + offset, data, size);
    + read_unlock_bh(&ldev->dmb_ht_lock);
    +
    + if (sf) {
    + conn = smcd->conn[rmb_node->sba_idx];
    + if (conn && !conn->killed)
    + tasklet_schedule(&conn->rx_tsklet);
    + else
    + return -EPIPE;
    + }
    + return 0;
    +}
    +
    static int smc_lo_supports_v2(void)
    {
    return SMC_LO_V2_CAPABLE;
    @@ -74,14 +195,14 @@ static struct device *smc_lo_get_dev(struct smcd_dev *smcd)

    static const struct smcd_ops lo_ops = {
    .query_remote_gid = smc_lo_query_rgid,
    - .register_dmb = NULL,
    - .unregister_dmb = NULL,
    + .register_dmb = smc_lo_register_dmb,
    + .unregister_dmb = smc_lo_unregister_dmb,
    .add_vlan_id = NULL,
    .del_vlan_id = NULL,
    .set_vlan_required = NULL,
    .reset_vlan_required = NULL,
    .signal_event = NULL,
    - .move_data = NULL,
    + .move_data = smc_lo_move_data,
    .supports_v2 = smc_lo_supports_v2,
    .get_local_gid = smc_lo_get_local_gid,
    .get_chid = smc_lo_get_chid,
    @@ -146,6 +267,8 @@ static void smcd_lo_unregister_dev(struct smc_lo_dev *ldev)
    static int smc_lo_dev_init(struct smc_lo_dev *ldev)
    {
    smc_lo_generate_ids(ldev);
    + rwlock_init(&ldev->dmb_ht_lock);
    + hash_init(ldev->dmb_ht);
    return smcd_lo_register_dev(ldev);
    }

    diff --git a/net/smc/smc_loopback.h b/net/smc/smc_loopback.h
    index d7df79f7bb64..b8206338309f 100644
    --- a/net/smc/smc_loopback.h
    +++ b/net/smc/smc_loopback.h
    @@ -20,13 +20,26 @@

    #if IS_ENABLED(CONFIG_SMC_LO)
    #define SMC_LO_MAX_DMBS 5000
    +#define SMC_LO_DMBS_HASH_BITS 12
    #define SMC_LO_RESERVED_CHID 0xFFFF

    +struct smc_lo_dmb_node {
    + struct hlist_node list;
    + u64 token;
    + u32 len;
    + u32 sba_idx;
    + void *cpu_addr;
    + dma_addr_t dma_addr;
    +};
    +
    struct smc_lo_dev {
    struct smcd_dev *smcd;
    struct device dev;
    u16 chid;
    struct smcd_gid local_gid;
    + rwlock_t dmb_ht_lock;
    + DECLARE_BITMAP(sba_idx_mask, SMC_LO_MAX_DMBS);
    + DECLARE_HASHTABLE(dmb_ht, SMC_LO_DMBS_HASH_BITS);
    };

    int smc_loopback_init(void);
    --
    2.32.0.3.g01195cf9f

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