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net/smc: implement DMB-merged operations of loopback-ism
This implements operations related to merging sndbuf with peer DMB in loopback-ism. The DMB won't be freed until no sndbuf is attached to it. 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> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Wen Gu
Paolo Abeni
parent
cc0ab806fc
commit
c3a910f238
@ -20,6 +20,7 @@
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#include "smc_loopback.h"
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#define SMC_LO_V2_CAPABLE 0x1 /* loopback-ism acts as ISMv2 */
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#define SMC_LO_SUPPORT_NOCOPY 0x1
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#define SMC_DMA_ADDR_INVALID (~(dma_addr_t)0)
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static const char smc_lo_dev_name[] = "loopback-ism";
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@ -81,6 +82,7 @@ static int smc_lo_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb,
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goto err_node;
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}
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dmb_node->dma_addr = SMC_DMA_ADDR_INVALID;
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refcount_set(&dmb_node->refcnt, 1);
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again:
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/* add new dmb into hash table */
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@ -94,6 +96,7 @@ static int smc_lo_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb,
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}
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hash_add(ldev->dmb_ht, &dmb_node->list, dmb_node->token);
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write_unlock_bh(&ldev->dmb_ht_lock);
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atomic_inc(&ldev->dmb_cnt);
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dmb->sba_idx = dmb_node->sba_idx;
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dmb->dmb_tok = dmb_node->token;
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@ -110,13 +113,29 @@ static int smc_lo_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb,
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return rc;
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}
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static void __smc_lo_unregister_dmb(struct smc_lo_dev *ldev,
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struct smc_lo_dmb_node *dmb_node)
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{
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/* remove dmb from hash table */
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write_lock_bh(&ldev->dmb_ht_lock);
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hash_del(&dmb_node->list);
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write_unlock_bh(&ldev->dmb_ht_lock);
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clear_bit(dmb_node->sba_idx, ldev->sba_idx_mask);
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kvfree(dmb_node->cpu_addr);
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kfree(dmb_node);
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if (atomic_dec_and_test(&ldev->dmb_cnt))
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wake_up(&ldev->ldev_release);
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}
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static int smc_lo_unregister_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb)
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{
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struct smc_lo_dmb_node *dmb_node = NULL, *tmp_node;
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struct smc_lo_dev *ldev = smcd->priv;
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/* remove dmb from hash table */
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write_lock_bh(&ldev->dmb_ht_lock);
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/* find dmb from hash table */
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read_lock_bh(&ldev->dmb_ht_lock);
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hash_for_each_possible(ldev->dmb_ht, tmp_node, list, dmb->dmb_tok) {
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if (tmp_node->token == dmb->dmb_tok) {
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dmb_node = tmp_node;
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@ -124,16 +143,76 @@ static int smc_lo_unregister_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb)
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}
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}
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if (!dmb_node) {
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write_unlock_bh(&ldev->dmb_ht_lock);
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read_unlock_bh(&ldev->dmb_ht_lock);
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return -EINVAL;
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}
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hash_del(&dmb_node->list);
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write_unlock_bh(&ldev->dmb_ht_lock);
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read_unlock_bh(&ldev->dmb_ht_lock);
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clear_bit(dmb_node->sba_idx, ldev->sba_idx_mask);
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kfree(dmb_node->cpu_addr);
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kfree(dmb_node);
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if (refcount_dec_and_test(&dmb_node->refcnt))
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__smc_lo_unregister_dmb(ldev, dmb_node);
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return 0;
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}
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static int smc_lo_support_dmb_nocopy(struct smcd_dev *smcd)
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{
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return SMC_LO_SUPPORT_NOCOPY;
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}
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static int smc_lo_attach_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb)
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{
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struct smc_lo_dmb_node *dmb_node = NULL, *tmp_node;
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struct smc_lo_dev *ldev = smcd->priv;
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/* find dmb_node according to dmb->dmb_tok */
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read_lock_bh(&ldev->dmb_ht_lock);
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hash_for_each_possible(ldev->dmb_ht, tmp_node, list, dmb->dmb_tok) {
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if (tmp_node->token == dmb->dmb_tok) {
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dmb_node = tmp_node;
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break;
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}
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}
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if (!dmb_node) {
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read_unlock_bh(&ldev->dmb_ht_lock);
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return -EINVAL;
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}
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read_unlock_bh(&ldev->dmb_ht_lock);
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if (!refcount_inc_not_zero(&dmb_node->refcnt))
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/* the dmb is being unregistered, but has
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* not been removed from the hash table.
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*/
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return -EINVAL;
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/* provide dmb information */
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dmb->sba_idx = dmb_node->sba_idx;
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dmb->dmb_tok = dmb_node->token;
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dmb->cpu_addr = dmb_node->cpu_addr;
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dmb->dma_addr = dmb_node->dma_addr;
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dmb->dmb_len = dmb_node->len;
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return 0;
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}
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static int smc_lo_detach_dmb(struct smcd_dev *smcd, u64 token)
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{
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struct smc_lo_dmb_node *dmb_node = NULL, *tmp_node;
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struct smc_lo_dev *ldev = smcd->priv;
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/* find dmb_node according to dmb->dmb_tok */
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read_lock_bh(&ldev->dmb_ht_lock);
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hash_for_each_possible(ldev->dmb_ht, tmp_node, list, token) {
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if (tmp_node->token == token) {
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dmb_node = tmp_node;
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break;
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}
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}
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if (!dmb_node) {
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read_unlock_bh(&ldev->dmb_ht_lock);
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return -EINVAL;
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}
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read_unlock_bh(&ldev->dmb_ht_lock);
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if (refcount_dec_and_test(&dmb_node->refcnt))
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__smc_lo_unregister_dmb(ldev, dmb_node);
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return 0;
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}
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@ -145,6 +224,12 @@ static int smc_lo_move_data(struct smcd_dev *smcd, u64 dmb_tok,
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struct smc_lo_dev *ldev = smcd->priv;
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struct smc_connection *conn;
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if (!sf)
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/* since sndbuf is merged with peer DMB, there is
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* no need to copy data from sndbuf to peer DMB.
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*/
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return 0;
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read_lock_bh(&ldev->dmb_ht_lock);
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hash_for_each_possible(ldev->dmb_ht, tmp_node, list, dmb_tok) {
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if (tmp_node->token == dmb_tok) {
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@ -159,13 +244,10 @@ static int smc_lo_move_data(struct smcd_dev *smcd, u64 dmb_tok,
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memcpy((char *)rmb_node->cpu_addr + offset, data, size);
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read_unlock_bh(&ldev->dmb_ht_lock);
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if (sf) {
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conn = smcd->conn[rmb_node->sba_idx];
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if (conn && !conn->killed)
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tasklet_schedule(&conn->rx_tsklet);
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else
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if (!conn || conn->killed)
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return -EPIPE;
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}
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tasklet_schedule(&conn->rx_tsklet);
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return 0;
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}
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@ -197,6 +279,9 @@ static const struct smcd_ops lo_ops = {
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.query_remote_gid = smc_lo_query_rgid,
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.register_dmb = smc_lo_register_dmb,
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.unregister_dmb = smc_lo_unregister_dmb,
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.support_dmb_nocopy = smc_lo_support_dmb_nocopy,
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.attach_dmb = smc_lo_attach_dmb,
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.detach_dmb = smc_lo_detach_dmb,
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.add_vlan_id = NULL,
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.del_vlan_id = NULL,
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.set_vlan_required = NULL,
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@ -275,12 +360,17 @@ static int smc_lo_dev_init(struct smc_lo_dev *ldev)
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smc_lo_generate_ids(ldev);
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rwlock_init(&ldev->dmb_ht_lock);
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hash_init(ldev->dmb_ht);
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atomic_set(&ldev->dmb_cnt, 0);
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init_waitqueue_head(&ldev->ldev_release);
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return smcd_lo_register_dev(ldev);
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}
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static void smc_lo_dev_exit(struct smc_lo_dev *ldev)
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{
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smcd_lo_unregister_dev(ldev);
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if (atomic_read(&ldev->dmb_cnt))
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wait_event(ldev->ldev_release, !atomic_read(&ldev->dmb_cnt));
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}
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static void smc_lo_dev_release(struct device *dev)
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@ -30,6 +30,7 @@ struct smc_lo_dmb_node {
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u32 sba_idx;
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void *cpu_addr;
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dma_addr_t dma_addr;
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refcount_t refcnt;
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};
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struct smc_lo_dev {
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@ -37,9 +38,11 @@ struct smc_lo_dev {
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struct device dev;
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u16 chid;
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struct smcd_gid local_gid;
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atomic_t dmb_cnt;
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rwlock_t dmb_ht_lock;
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DECLARE_BITMAP(sba_idx_mask, SMC_LO_MAX_DMBS);
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DECLARE_HASHTABLE(dmb_ht, SMC_LO_DMBS_HASH_BITS);
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wait_queue_head_t ldev_release;
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};
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int smc_loopback_init(void);
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